/* ============================================
   Paul Barroux — UX/UI Portfolio
   Stylesheet
   ============================================ */

/* --- Self-hosted fonts (works inside mainland China) --- */
/* DM Serif Display 400 — latin */
@font-face {
  font-family: 'DM Serif Display';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../assets/fonts/DMSerifDisplay-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* DM Serif Display 400 — latin-ext (covers French diacritics, accented Polish/Czech, etc.) */
@font-face {
  font-family: 'DM Serif Display';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../assets/fonts/DMSerifDisplay-latinExt.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* Inter (variable font, one file covers 400/500/600) — latin */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('../assets/fonts/Inter-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* Inter — latin-ext */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('../assets/fonts/Inter-latinExt.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-bg: #FAFBFD;
  --color-surface: #FFFFFF;
  --color-surface-border: #E8ECF1;
  --color-primary: #2B59C3;
  --color-primary-hover: #1E3F8F;
  --color-text: #1A1E2C;
  --color-text-secondary: #6B7394;
  --color-divider: #E2E6EE;
  --color-tint: #F0F3F8;
  --color-placeholder: #E2E6EE;

  /* Typography — Chinese fallbacks added so 中文 has graceful native typography in mainland CN */
  --font-heading: 'DM Serif Display', 'Songti SC', 'STSong', 'SimSun', Georgia, serif;
  --font-body: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;

  --text-hero: 60px;
  --text-section: 40px;
  --text-project-title: 28px;
  --text-case-title: 48px;
  --text-case-section: 32px;
  --text-body: 17px;
  --text-subtitle: 20px;
  --text-small: 14px;
  --text-label: 13px;

  --leading-body: 1.5;
  --leading-heading: 1.2;
  --tracking-label: 0.08em;

  /* Spacing (8px grid) */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
  --space-section: 120px;

  /* Layout */
  --max-width: 1200px;
  --padding-desktop: 80px;
  --padding-tablet: 48px;
  --padding-mobile: 24px;

  /* Transitions */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --duration: 0.3s;

  /* Misc */
  --radius: 6px;
  --shadow-card: 0 2px 8px rgba(26, 30, 44, 0.06);
  --shadow-card-hover: 0 8px 24px rgba(26, 30, 44, 0.1);
  --nav-height: 72px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- Utility --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--padding-desktop);
  padding-right: var(--padding-desktop);
}

.label {
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

/* Section header with label + count */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.section-label {
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.section-count {
  font-family: var(--font-body);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  letter-spacing: var(--tracking-label);
}

/* Scroll-triggered animation base */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   i18n — EN / 中文 toggle
   Wrappers use display:contents so they're invisible to layout.
   Default (html lang="en"): show EN, hide ZH.
   When html.lang="zh": flipped.
   ============================================ */
[data-lang] { display: contents; }
[data-lang="zh"] { display: none; }
html[lang="zh"] [data-lang="en"] { display: none; }
html[lang="zh"] [data-lang="zh"] { display: contents; }

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(250, 251, 253, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: transform var(--duration) var(--ease);
}

.navbar.hidden {
  transform: translateY(-100%);
}

.navbar__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-desktop);
  height: 100%;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.navbar__logo {
  font-family: var(--font-heading);
  font-size: 22px;
  color: var(--color-text);
  transition: color var(--duration) var(--ease);
}

.navbar__logo:hover {
  color: var(--color-primary);
}

.navbar__links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
}

/* Right-side slot: lang toggle + hamburger */
.navbar__end {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-md);
}

/* Language toggle (EN / 中) */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 0;
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.lang-toggle__btn {
  padding: 4px 6px;
  color: var(--color-text-secondary);
  border-radius: 3px;
  transition: color var(--duration) var(--ease), background var(--duration) var(--ease);
}

.lang-toggle__btn:hover {
  color: var(--color-text);
}

.lang-toggle__btn.active {
  color: var(--color-primary);
}

.lang-toggle__sep {
  color: var(--color-divider);
  user-select: none;
}

/* CV download button */
.navbar__cv {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 3px 9px;
  border: 1px solid var(--color-divider);
  border-radius: 999px;
  transition: color var(--duration) var(--ease), border-color var(--duration) var(--ease);
  white-space: nowrap;
}

.navbar__cv:hover {
  color: var(--color-primary);
  border-color: rgba(43, 89, 195, 0.4);
}

.navbar__cv svg {
  flex-shrink: 0;
}

.navbar__link {
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration) var(--ease);
  position: relative;
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-primary);
  transition: width var(--duration) var(--ease);
}

.navbar__link:hover {
  color: var(--color-text);
}

.navbar__link:hover::after {
  width: 100%;
}

/* Hamburger (mobile) */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 6px;
  cursor: pointer;
  z-index: 1001;
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}

.hamburger.active .hamburger__line:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.hamburger.active .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger__line:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* Mobile menu overlay */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100vh;
  background: var(--color-surface);
  border-left: 1px solid var(--color-divider);
  padding: calc(var(--nav-height) + var(--space-lg)) var(--space-lg) var(--space-lg);
  transform: translateX(100%);
  transition: transform 0.4s var(--ease);
  z-index: 999;
}

.mobile-menu.open {
  transform: translateX(0);
}

.mobile-menu__overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(26, 30, 44, 0.3);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease);
  z-index: 998;
}

.mobile-menu__overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu__link {
  display: block;
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: color var(--duration) var(--ease);
}

.mobile-menu__link:hover {
  color: var(--color-primary);
}

.lang-toggle--mobile {
  margin: var(--space-md) 0 0;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-divider);
}

/* Ensure mobile lang toggle buttons meet 44×44px touch target */
.lang-toggle--mobile .lang-toggle__btn {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--nav-height);
  position: relative;
}

.hero__left {
  max-width: 75%;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: var(--text-hero);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.hero__typing {
  font-size: 28px;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  min-height: 42px;
}

.typing-text {
  color: var(--color-primary);
  font-weight: 500;
}

.typing-cursor::after {
  content: '|';
  animation: blink 0.7s step-end infinite;
  color: var(--color-primary);
  margin-left: 1px;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero__intro {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: var(--leading-body);
}

.hero__scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.hero__scroll-indicator span {
  font-size: var(--text-label);
  color: var(--color-text-secondary);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-divider);
  position: relative;
  overflow: hidden;
}

.hero__scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-primary);
  animation: scrollLine 2s var(--ease) infinite;
}

@keyframes scrollLine {
  0% { top: -100%; }
  50% { top: 0; }
  100% { top: 100%; }
}

/* ============================================
   EXPERTISE / SKILLS SECTION
   ============================================ */
.expertise {
  padding: 140px 0;
  background: var(--color-tint);
}

.expertise__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.expertise__column {
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: 16px;
  padding: var(--space-lg);
}

.expertise__column:first-child {
  /* card handles its own padding */
}

.expertise__column:last-child {
  /* card handles its own border */
}

.expertise__column-title {
  margin-bottom: var(--space-md);
}

.expertise__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.expertise__item {
  font-size: var(--text-body);
  color: var(--color-text);
  line-height: var(--leading-body);
}

/* ============================================
   PROJECTS SECTION — Scroll-locked carousel
   ============================================ */

/* Wrapper creates scrollable space for sticky to live in */
.projects-wrapper {
  height: 500vh; /* 100vh per project */
  position: relative;
}

.projects {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

/* Two-column layout */
.projects__layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-lg);
  align-items: center;
}

/* Slide stage (left column) */
.projects__stage {
  position: relative;
  min-height: 420px;
}

.projects__slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  display: block;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

.projects__slide.active {
  position: relative;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.projects__slide-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-placeholder);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: var(--text-small);
  transition: box-shadow var(--duration) var(--ease);
}

.projects__slide:hover .projects__slide-image {
  box-shadow: var(--shadow-card-hover);
}

.projects__slide-title {
  font-family: var(--font-heading);
  font-size: var(--text-project-title);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-top: var(--space-md);
  margin-bottom: 12px;
  transition: color var(--duration) var(--ease);
}

.projects__slide:hover .projects__slide-title {
  color: var(--color-primary);
}

.projects__slide-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* Tag pills */
.tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-divider);
  border-radius: 999px;
  padding: 4px 12px;
  transition: border-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.projects__slide:hover .tag {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Project list sidebar (right column) */
.projects__list {
  display: flex;
  flex-direction: column;
}

.projects__list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-divider);
  cursor: pointer;
  text-align: left;
  transition: color var(--duration) var(--ease);
  color: var(--color-text-secondary);
}

.projects__list-item:first-child {
  border-top: 1px solid var(--color-divider);
}

.projects__list-indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: transparent;
  flex-shrink: 0;
  transition: background var(--duration) var(--ease);
}

.projects__list-item.active .projects__list-indicator {
  background: var(--color-primary);
}

.projects__list-name {
  font-family: var(--font-heading);
  font-size: 20px;
  line-height: var(--leading-heading);
  transition: color var(--duration) var(--ease);
}

.projects__list-item.active {
  color: var(--color-primary);
}

.projects__list-item:hover {
  color: var(--color-text);
}

.projects__list-item.active:hover {
  color: var(--color-primary);
}

/* Mobile stacked cards (hidden on desktop) */
.projects__mobile-list {
  display: none;
}

.projects__mobile-card {
  display: block;
  margin-bottom: var(--space-lg);
}

.projects__mobile-card:last-child {
  margin-bottom: 0;
}

.projects__mobile-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-placeholder);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: var(--text-small);
}

.projects__mobile-title {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-top: var(--space-sm);
  margin-bottom: 8px;
}

.projects__mobile-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ============================================
   CONTACT / FOOTER
   ============================================ */
.contact {
  padding: var(--space-xl) 0 var(--space-lg);
  text-align: center;
}

.contact .section-title {
  margin-bottom: var(--space-md);
}

.contact__text {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.contact__email {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 32px;
  color: var(--color-primary);
  transition: color var(--duration) var(--ease);
  position: relative;
}

.contact__email::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration) var(--ease);
}

.contact__email:hover {
  color: var(--color-primary-hover);
}

.contact__email:hover::after {
  transform: scaleX(1);
  transform-origin: left;
  background: var(--color-primary-hover);
}

/* WeChat block in contact section */
.contact__wechat {
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.contact__wechat-label {
  font-size: var(--text-small);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.contact__wechat-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.contact__wechat-qr {
  width: 140px;
  height: 140px;
  flex-shrink: 0;
  background: var(--color-placeholder);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.contact__wechat-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  gap: 4px;
}

.contact__wechat-name {
  font-family: var(--font-heading);
  font-size: 22px;
  color: var(--color-text);
  line-height: var(--leading-heading);
}

.contact__wechat-id {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--color-text-secondary);
  user-select: all;
}

.footer {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-divider);
  text-align: center;
}

.footer__copy {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.page-hero {
  padding: calc(var(--nav-height) + var(--space-section)) 0 var(--space-xl);
}

.page-hero__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-title);
  line-height: var(--leading-heading);
  color: var(--color-text);
}

.about-bio {
  padding: 0 0 var(--space-section);
}

.about-bio__text {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text);
  max-width: 720px;
  margin-bottom: var(--space-md);
}

.about-bio__text:last-child {
  margin-bottom: 0;
}

/* About skills (enhanced version) */
.about-skills {
  padding: var(--space-section) 0;
  background: var(--color-tint);
}

.about-skills .expertise__grid {
  margin-top: 0;
}

/* ============================================
   PROJECT CASE STUDY PAGE — Redesigned
   ============================================ */

/* Header block — full-width tinted background */
.case-header {
  background: var(--color-tint);
  padding: 120px 0;
  margin-top: var(--nav-height);
}

.case-header__inner {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: var(--space-lg);
  align-items: start;
}

.case-header__breadcrumb {
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.case-header__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-title);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.case-header__desc {
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 540px;
  margin-bottom: var(--space-md);
}

.case-header__meta {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

.case-header__meta + .case-header__meta {
  margin-top: var(--space-xs);
}

/* Header hero image (replaces blank spacer when a real image is provided) */
.case-header__hero-img {
  width: 100%;
}
.case-header__hero-img img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
}

/* Tags row below the header */
.case-tags {
  padding: var(--space-lg) 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* Alternating two-column content sections */
.case-block {
  padding: 110px 0;
  border-bottom: 1px solid var(--color-divider);
}

.case-block:last-of-type {
  border-bottom: none;
}

.case-block__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: start;
}

/* Reverse column order for alternating layout */
.case-block--reversed .case-block__grid {
  direction: rtl;
}

.case-block--reversed .case-block__grid > * {
  direction: ltr;
}

.case-block__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--color-placeholder);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: var(--text-small);
}

.case-block__content {
  padding-top: var(--space-sm);
}

.case-block__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: 8px;
}

.case-block__subtitle {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.case-block__text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

/* Key Learnings — centered text */
.case-learnings {
  padding: 110px 0;
}

.case-learnings__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-md);
}

.case-learnings__text {
  font-size: var(--text-body);
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

/* ============================================
   CASE STUDY — EXTENDED LAYOUT COMPONENTS
   (Honor AI & future case studies)
   ============================================ */

/* Section intro — centered label + title divider */
.case-section-intro {
  padding: var(--space-xl) 0 var(--space-lg);
  text-align: center;
}

.case-section-intro__label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.case-section-intro__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
}

/* Feature label (01 / 02…) inside case-block */
.case-feature-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

/* Target Audience */
.case-audience {
  padding: 110px 0;
}

.case-audience__header {
  margin-bottom: var(--space-xl);
}

.case-audience__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-audience__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-audience__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.case-audience__image {
  aspect-ratio: 4/3;
  background: var(--color-placeholder);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

.case-audience__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.case-audience__item {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

.case-audience__item::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  min-width: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  margin-top: 9px;
}

/* Methodology — 3-column cards */
.case-methodology {
  padding: 110px 0;
  background: var(--color-tint);
}

.case-methodology__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.case-methodology__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-methodology__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-methodology__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.case-methodology__card {
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: 16px;
  padding: var(--space-lg);
}

.case-methodology__card-num {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.case-methodology__card-title {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.case-methodology__card-text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

/* Intro context variant — tighter gap and padding for text-heavy cards */
.case-methodology--intro .case-methodology__cards {
  gap: var(--space-md);
}
.case-methodology--intro .case-methodology__card {
  padding: var(--space-md);
}

/* Competitive Benchmark — 2-card layout */
.case-benchmark {
  padding: 110px 0;
}

.case-benchmark__header {
  margin-bottom: var(--space-xl);
}

.case-benchmark__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-benchmark__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-benchmark__cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.case-benchmark__card {
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: 16px;
  padding: var(--space-lg);
}

.case-benchmark__card-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.case-benchmark__card-title {
  font-family: var(--font-heading);
  font-size: 26px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.case-benchmark__card-text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

/* Wireframes — full-width image */
.case-wireframes {
  padding: 110px 0;
}

.case-wireframes__header {
  margin-bottom: var(--space-lg);
}

.case-wireframes__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-wireframes__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: var(--leading-body);
}

.case-wireframes__image {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-placeholder);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-top: var(--space-lg);
}

/* ── Real image overrides (remove placeholder styling when an img is present) ── */
.case-block__image:has(img),
.case-audience__image:has(img) {
  aspect-ratio: unset;
  background: none;
  display: block;
}
.case-wireframes__image:has(img) {
  aspect-ratio: unset;
  background: none;
  display: block;
}
.case-callout__image:has(img) {
  aspect-ratio: unset;
  background: none;
  display: block;
}
.case-problem__image:has(img) {
  aspect-ratio: unset;
  background: none;
  display: block;
}
.case-posts__image:has(img) {
  aspect-ratio: unset;
  background: none;
  display: block;
}
.case-block__image img,
.case-wireframes__image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}
.case-audience__image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
}
.case-callout__image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
}
.case-problem__image img,
.case-posts__image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
}
/* Desktop project card images */
.projects__slide-image:has(img) {
  background: none;
  padding: 0;
  display: block;
}
.projects__slide-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
}
/* Mobile project card images */
.projects__mobile-image:has(img) {
  background: none;
  display: block;
}
.projects__mobile-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
}

/* ── Problem Statement (centered question) ── */
.case-question {
  padding: 110px 0;
  text-align: center;
  border-bottom: 1px solid var(--color-divider);
}

.case-question__label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.case-question__quote {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: 1.3;
  color: var(--color-text);
  max-width: 780px;
  margin: 0 auto var(--space-lg);
}

.case-question__text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* ── Guiding Principle ── */
.case-principle {
  padding: var(--space-section) 0;
  text-align: center;
}

.case-principle__label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
}

.case-principle__quote {
  font-family: var(--font-heading);
  font-size: 36px;
  line-height: 1.35;
  color: var(--color-text);
  max-width: 720px;
  margin: 0 auto;
}

/* ── Methodology Steps (numbered vertical list) ── */
.case-steps {
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.case-step {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.case-step__num {
  font-family: var(--font-heading);
  font-size: 40px;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.25;
  flex-shrink: 0;
  min-width: 56px;
  text-align: right;
}

.case-step__body {
  flex: 1;
  padding-top: 6px;
}

.case-step__title {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-step__text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

/* ── Persona Cards (compact 2-col) ── */
.case-personas {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.case-persona {
  background: var(--color-bg);
  border: 1px solid var(--color-surface-border);
  border-radius: 12px;
  padding: var(--space-md);
}

.case-persona__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-divider);
}

.case-persona__avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-family: var(--font-heading);
  font-size: 18px;
  flex-shrink: 0;
}

.case-persona__name {
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--color-text);
  line-height: 1.2;
}

.case-persona__role {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

.case-persona__facts {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.case-persona__fact-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: 2px;
}

.case-persona__fact-text {
  font-size: var(--text-small);
  line-height: var(--leading-body);
  color: var(--color-text);
}

/* ── Solution Axis sub-section label (inside case-block content) ── */
.case-block__section-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

/* Secondary placeholder image inside content column */
.case-block__image-secondary {
  width: 100%;
  aspect-ratio: 16/7;
  background: var(--color-placeholder);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: var(--text-small);
  margin-top: var(--space-md);
}

/* ── Target Audience Callout (research highlight box) ── */
.case-callout {
  background: var(--color-tint);
  padding: var(--space-xl) 0;
}

.case-callout__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.case-callout__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.case-callout__image {
  aspect-ratio: 4/3;
  background: var(--color-placeholder);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

.case-callout__text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

/* ── Problem Statement Cards (2×2 grid) ── */
.case-problem {
  padding: 110px 0;
}

.case-problem__header {
  margin-bottom: var(--space-xl);
}

.case-problem__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-problem__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-problem__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.case-problem__card {
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: 16px;
  padding: var(--space-lg);
}

.case-problem__card-num {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.case-problem__card-category {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.case-problem__card-text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

.case-problem__image {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-placeholder);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-top: var(--space-lg);
}

/* ── Study Meta (duration / location block) ── */
.case-study-meta {
  margin-bottom: var(--space-xl);
}

.case-study-meta__items {
  display: flex;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.case-study-meta__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.case-study-meta__label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.case-study-meta__value {
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-text);
}

/* ── Observation Posts Grid (methodology) ── */
.case-posts {
  margin-top: var(--space-xl);
}

.case-posts__subtitle {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.case-posts__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.case-posts__item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: 12px;
}

.case-posts__item-num {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
  min-width: 28px;
}

.case-posts__item-title {
  font-size: var(--text-body);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.case-posts__item-desc {
  font-size: var(--text-small);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

.case-posts__methods {
  margin-top: var(--space-lg);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  padding: var(--space-md);
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface);
  border-radius: 0 8px 8px 0;
}

.case-posts__image {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-placeholder);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-top: var(--space-xl);
}

/* ── Generic Bullet List (observations) ── */
.case-list {
  list-style: none;
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.case-list__item {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

.case-list__item::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  min-width: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  margin-top: 9px;
}

/* ── Stat Blocks (large numbers) ── */
.case-stats {
  display: flex;
  gap: var(--space-md);
  margin: var(--space-lg) 0;
  flex-wrap: wrap;
}

.case-stats__item {
  flex: 1;
  min-width: 120px;
  text-align: center;
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: 12px;
}

.case-stats__num {
  font-family: var(--font-heading);
  font-size: 56px;
  line-height: 1;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.case-stats__label {
  font-size: var(--text-small);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

/* ── Pull Quotes (customer verbatim) ── */
.case-pullquotes {
  margin-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.case-pullquote {
  border-left: 3px solid var(--color-primary);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-body);
  font-style: italic;
  color: var(--color-text);
  line-height: var(--leading-body);
  background: var(--color-tint);
  border-radius: 0 8px 8px 0;
}

/* ── Heat Map Zones ── */
.case-heatmap {
  margin: var(--space-lg) 0;
}

.case-heatmap__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.case-heatmap__zone {
  padding: var(--space-md);
  border-radius: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
}

.case-heatmap__zone-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: 4px;
}

.case-heatmap__zone-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.case-heatmap__zone-dot--red    { background: #e74c3c; }
.case-heatmap__zone-dot--orange { background: #e67e22; }
.case-heatmap__zone-dot--yellow { background: #c9a400; }
.case-heatmap__zone-dot--green  { background: #27ae60; }

.case-heatmap__zone-level {
  font-weight: 600;
  font-size: var(--text-small);
  color: var(--color-text);
}

.case-heatmap__zone-count {
  font-size: var(--text-label);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.case-heatmap__zone-areas {
  font-size: var(--text-small);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

/* ── Pros/Cons Split (e.g. call terminals) ── */
.case-split {
  padding: 110px 0;
  background: var(--color-tint);
}

.case-split__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.case-split__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-split__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-split__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.case-split__col-title {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-divider);
}

.case-split__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.case-split__item {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  padding-left: var(--space-md);
  position: relative;
}

.case-split__item--pro::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #27ae60;
  font-weight: 700;
}

.case-split__item--con::before {
  content: '✕';
  position: absolute;
  left: 0;
  color: #c0392b;
  font-weight: 700;
}

/* ── Analysis Insights (2×2 numbered cards) ── */
.case-insights {
  padding: 110px 0;
}

.case-insights__header {
  margin-bottom: var(--space-xl);
}

.case-insights__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-insights__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-insights__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.case-insights__item {
  padding: var(--space-lg);
  border: 1px solid var(--color-surface-border);
  border-radius: 16px;
  background: var(--color-surface);
}

.case-insights__num {
  font-family: var(--font-heading);
  font-size: 72px;
  line-height: 1;
  color: var(--color-divider);
  margin-bottom: var(--space-sm);
}

.case-insights__item-title {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.case-insights__item-text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

/* ── Recommendation Actions List ── */
.case-actions {
  list-style: none;
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.case-actions__item {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

.case-actions__item::before {
  content: '→';
  color: var(--color-primary);
  flex-shrink: 0;
  font-weight: 600;
  line-height: var(--leading-body);
}

/* ── Mobile screens — portrait row (9:19) ── */
.case-screens {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  margin-top: var(--space-lg);
}

.case-screens__item {
  flex: 1;
  background: var(--color-divider);
  border-radius: 20px;
  aspect-ratio: 9/19;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--color-text-secondary);
  font-weight: 500;
  text-align: center;
  padding: var(--space-sm);
  line-height: 1.4;
}

/* ── Color swatches ── */
.case-swatches {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.case-swatch {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.case-swatch__color {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  flex-shrink: 0;
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.case-swatch__label {
  font-size: var(--text-body);
  font-weight: 600;
  color: var(--color-text);
  display: block;
  margin-bottom: 2px;
}

.case-swatch__hex {
  font-size: var(--text-label);
  color: var(--color-text-secondary);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.04em;
}

/* ── Type scale ── */
.case-typescale {
  margin-top: var(--space-md);
  border: 1px solid var(--color-surface-border);
  border-radius: 12px;
  overflow: hidden;
}

.case-typescale__row {
  display: grid;
  grid-template-columns: 2fr 80px 1fr;
  padding: 12px var(--space-md);
  border-bottom: 1px solid var(--color-surface-border);
  align-items: center;
  gap: var(--space-sm);
}

.case-typescale__row:last-child {
  border-bottom: none;
}

.case-typescale__row--header {
  background: var(--color-tint);
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.case-typescale__sample {
  color: var(--color-text);
}

.case-typescale__meta {
  font-size: var(--text-label);
  color: var(--color-text-secondary);
}

.case-typescale__weights {
  margin-top: var(--space-sm);
  font-size: var(--text-label);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ── List label (Needs / Frustrations headings) ── */
.case-list-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

.case-list-label:first-child {
  margin-top: var(--space-md);
}

/* ── Visual Identity section ── */
.case-identity {
  padding: 110px 0;
}

.case-identity__header {
  margin-bottom: var(--space-xl);
}

.case-identity__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-identity__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-identity__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.case-identity__col-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.case-identity__col-title {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-identity__col-text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

/* ── Design Choices section ── */
.case-choices {
  padding: 110px 0;
  background: var(--color-tint);
}

.case-choices__header {
  margin-bottom: var(--space-xl);
}

.case-choices__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-choices__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-choices__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.case-choices__card {
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: 16px;
  padding: var(--space-lg);
}

.case-choices__card-title {
  font-family: var(--font-heading);
  font-size: 20px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-choices__card-text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
}

.case-choices__image {
  background: var(--color-divider);
  border-radius: 12px;
  aspect-ratio: 16/7;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-label);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ── Features section ── */
.case-features {
  padding: 110px 0;
}

.case-features__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.case-features__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-features__subtitle {
  font-size: var(--text-subtitle);
  color: var(--color-text-secondary);
}

.case-feature {
  padding-bottom: var(--space-xl);
  margin-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-divider);
}

.case-feature:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.case-feature__num {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.case-feature__title {
  font-family: var(--font-heading);
  font-size: 28px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.case-feature__text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  max-width: 640px;
}

/* ── Design System section ── */
.case-ds {
  padding: 110px 0;
}

.case-ds__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.case-ds__label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.case-ds__title {
  font-family: var(--font-heading);
  font-size: var(--text-case-section);
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.case-ds__intro {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

.case-ds__blocks {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.case-ds__block {
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: 20px;
  padding: var(--space-xl);
}

.case-ds__block-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.case-ds__block-title {
  font-family: var(--font-heading);
  font-size: 26px;
  line-height: var(--leading-heading);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.case-ds__block-text {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.case-ds__image {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: 12px;
  aspect-ratio: 16/8;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-label);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* Visual Identity — 3-column benchmark variant */
.case-benchmark__cards--three {
  grid-template-columns: repeat(3, 1fr);
}

.case-benchmark__card-img {
  background: var(--color-divider);
  border-radius: 8px;
  aspect-ratio: 4/3;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-label);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ============================================
   APPROACH SECTION (Homepage)
   ============================================ */
.approach {
  padding: var(--space-section) 0;
  background: var(--color-tint);
}

.approach__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.approach__header .section-label {
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.approach__tagline {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: var(--leading-heading);
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
  font-style: italic;
}

/* Project navigation at bottom */
.project-nav {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-divider);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-section);
}

.project-nav__link {
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration) var(--ease);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  min-height: 44px;
}

.project-nav__link:hover {
  color: var(--color-primary);
}

.project-nav__link--next {
  text-align: right;
  flex-direction: row;
}

.project-nav__link--next .project-nav__name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-project-title);
  color: var(--color-text);
  transition: color var(--duration) var(--ease);
}

.project-nav__link--next:hover .project-nav__name {
  color: var(--color-primary);
}

.project-nav__arrow {
  font-size: 24px;
  transition: transform var(--duration) var(--ease);
}

.project-nav__link:hover .project-nav__arrow {
  transform: translateX(4px);
}

.project-nav__link--back:hover .project-nav__arrow {
  transform: translateX(-4px);
}

/* ============================================
   RESPONSIVE — TABLET (768–1024px)
   ============================================ */
@media (max-width: 1024px) {
  .container {
    padding-left: var(--padding-tablet);
    padding-right: var(--padding-tablet);
  }

  .navbar__inner {
    padding: 0 var(--padding-tablet);
  }

  :root {
    --text-hero: 48px;
    --text-section: 34px;
    --text-case-title: 40px;
    --text-case-section: 28px;
  }

  .expertise__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }

  .expertise__column:last-child {
    grid-column: 1 / -1;
  }

  .projects__layout {
    grid-template-columns: 1fr 240px;
    gap: var(--space-md);
  }

  .projects__list-name {
    font-size: 18px;
  }

  /* Case study header */
  .case-header__inner {
    grid-template-columns: 0.5fr 1.5fr;
  }

  /* Case study content blocks */
  .case-block__grid {
    gap: var(--space-lg);
  }

  /* Extended components — tablet */
  .case-methodology__cards {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .case-benchmark__cards {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .approach__tagline {
    font-size: 19px;
  }

  .case-benchmark__cards--three {
    grid-template-columns: 1fr 1fr;
  }

  .case-identity__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .case-choices__grid {
    grid-template-columns: 1fr 1fr;
  }

  .case-choices {
    padding: 80px 0;
  }

  .case-features {
    padding: 80px 0;
  }

  .case-ds {
    padding: 80px 0;
  }

  .case-ds__block {
    padding: var(--space-lg);
  }

  .case-identity {
    padding: 80px 0;
  }

  .case-audience__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* Sprint/workshop components — tablet */
  .case-question {
    padding: 60px 0;
  }

  .case-principle__quote {
    font-size: 28px;
  }

  .case-personas {
    grid-template-columns: 1fr 1fr;
  }

  /* Research components — tablet */
  .case-problem__grid {
    grid-template-columns: 1fr;
  }

  .case-posts__grid {
    grid-template-columns: 1fr;
  }

  .case-callout__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .case-heatmap__grid {
    grid-template-columns: 1fr;
  }

  .case-split__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .case-insights__grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   RESPONSIVE — MOBILE (<768px)
   ============================================ */
@media (max-width: 767px) {
  .container {
    padding-left: var(--padding-mobile);
    padding-right: var(--padding-mobile);
  }

  .navbar__inner {
    padding: 0 var(--padding-mobile);
  }

  :root {
    --text-hero: 36px;
    --text-section: 28px;
    --text-case-title: 32px;
    --text-case-section: 24px;
    --text-project-title: 22px;
    --space-section: 60px;
  }

  /* Nav: switch back to flex so logo/hamburger stay at opposite ends */
  .navbar__inner {
    display: flex;
    justify-content: space-between;
  }

  .navbar__links {
    display: none;
  }

  /* Hide desktop lang toggle — mobile version lives in mobile-menu */
  .navbar__end .lang-toggle {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu,
  .mobile-menu__overlay {
    display: block;
  }

  /* Hero */
  .hero {
    min-height: 85vh;
  }

  .hero__scroll-indicator {
    bottom: 24px;
  }

  .hero__intro {
    max-width: 100%;
  }

  /* Expertise */
  .expertise__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .expertise__column:last-child {
    grid-column: auto;
  }

  /* Hero */
  .hero__left {
    max-width: 100%;
  }

  .hero__typing {
    font-size: 22px;
    min-height: 34px;
  }

  /* Projects: disable scroll-lock, show stacked cards */
  .projects-wrapper {
    height: auto;
  }

  .projects {
    position: relative;
    height: auto;
    padding: var(--space-section) 0;
  }

  .projects__layout {
    display: none;
  }

  .projects__mobile-list {
    display: block;
  }

  /* Contact */
  .contact__email {
    font-size: 24px;
  }

  .contact__wechat {
    margin-top: var(--space-xl);
  }

  .contact__wechat-card {
    flex-direction: column;
    text-align: center;
    padding: var(--space-md);
  }

  .contact__wechat-info {
    align-items: center;
    text-align: center;
  }

  /* Approach section */
  .approach {
    padding: var(--space-xl) 0;
  }

  .approach__tagline {
    font-size: 17px;
  }

  /* Case study header */
  .case-header {
    padding: 80px 0;
  }

  .case-header__inner {
    grid-template-columns: 1fr;
  }

  .case-header__spacer {
    display: none;
  }

  /* Case study content blocks */
  .case-block {
    padding: 60px 0;
  }

  .case-block__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .case-block--reversed .case-block__grid {
    direction: ltr;
  }

  .case-learnings {
    padding: 60px 0;
  }

  /* Project navigation */
  .project-nav {
    flex-direction: column;
    gap: var(--space-md);
    align-items: stretch;
  }

  .project-nav__link--next {
    text-align: left;
  }

  /* About */
  .about-bio__text {
    font-size: 16px;
  }

  /* Extended components — mobile */
  .case-methodology {
    padding: 60px 0;
  }

  .case-methodology__cards {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .case-benchmark {
    padding: 60px 0;
  }

  .case-benchmark__cards {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .case-benchmark__cards--three {
    grid-template-columns: 1fr;
  }

  .case-identity {
    padding: 60px 0;
  }

  .case-identity__grid {
    grid-template-columns: 1fr;
  }

  .case-choices {
    padding: 60px 0;
  }

  .case-choices__grid {
    grid-template-columns: 1fr;
  }

  .case-features {
    padding: 60px 0;
  }

  .case-screens {
    flex-wrap: wrap;
  }

  .case-screens__item {
    flex: 0 1 calc(50% - var(--space-sm));
    min-width: 0;
  }

  /* Reset 2-screen cap on mobile so items wrap at ~50% */
  .case-screens:has(> .case-screens__item:nth-child(2):last-child) .case-screens__item {
    flex: 0 1 calc(50% - var(--space-sm));
    max-width: none;
  }

  .case-ds {
    padding: 60px 0;
  }

  .case-ds__block {
    padding: var(--space-md);
  }

  .case-audience {
    padding: 60px 0;
  }

  .case-audience__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .case-wireframes {
    padding: 60px 0;
  }

  /* Sprint/workshop components — mobile */
  .case-question {
    padding: 48px 0;
  }

  .case-principle {
    padding: 60px 0;
  }

  .case-principle__quote {
    font-size: 24px;
  }

  .case-personas {
    grid-template-columns: 1fr;
  }

  .case-step {
    gap: var(--space-md);
  }

  .case-step__num {
    font-size: 28px;
    min-width: 36px;
  }

  /* Research components — mobile */
  .case-problem {
    padding: 60px 0;
  }

  .case-problem__grid {
    grid-template-columns: 1fr;
  }

  .case-posts__grid {
    grid-template-columns: 1fr;
  }

  .case-callout__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .case-stats {
    flex-direction: column;
  }

  .case-heatmap__grid {
    grid-template-columns: 1fr;
  }

  .case-split {
    padding: 60px 0;
  }

  .case-split__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .case-insights {
    padding: 60px 0;
  }

  .case-insights__grid {
    grid-template-columns: 1fr;
  }

  .case-insights__num {
    font-size: 48px;
  }
}

/* ============================================
   WEPLAN — Mobile screen rows & DS images
   ============================================ */

/* Portrait phone screens: remove placeholder, let image size naturally */
.case-screens__item:has(img) {
  aspect-ratio: unset;
  background: none;
  padding: 0;
  display: block;
}

.case-screens__item img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 20px;
}

/* Design system image blocks (landscape exports) */
.case-ds__image:has(img) {
  aspect-ratio: unset;
  background: none;
  border: none;
  display: block;
}

.case-ds__image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
}

/* Visual identity benchmark card images — force square crop */
.case-benchmark__card-img:has(img) {
  aspect-ratio: 1/1;
  background: none;
  display: block;
  padding: 0;
  overflow: hidden;
}

.case-benchmark__card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 0;
}

/* Cap 2-screen rows to match 3-screen row proportions */
.case-screens:has(> .case-screens__item:nth-child(2):last-child) {
  justify-content: center;
}

.case-screens:has(> .case-screens__item:nth-child(2):last-child) .case-screens__item {
  flex: 0 0 31%;
  max-width: 31%;
}

/* WeChat QR: remove placeholder styling when real image present */
.contact__wechat-qr:has(img) {
  background: none;
  display: block;
}

.contact__wechat-qr img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 4px;
}

/* Key Learnings — list alignment (replaces per-page inline styles) */
.case-learnings .case-list {
  max-width: 700px;
  margin: 0 auto;
  text-align: left;
}