/* ==========================================================================
   Timeless Design System for LillltaChen (ChenNan Portfolio)
   Inspired by Timeless.co — Warm Editorial Minimalism & Fluid Micro-Interactions
   ========================================================================== */

:root {
  --bg-primary: #fcfcfb;
  --bg-secondary: #f4f4f2;
  --bg-card: #ffffff;
  --bg-card-hover: #f9f9f8;
  --bg-pill: rgba(0, 0, 0, 0.04);
  --bg-pill-hover: rgba(0, 0, 0, 0.08);

  --text-primary: #101010;
  --text-secondary: rgba(16, 16, 16, 0.65);
  --text-tertiary: rgba(16, 16, 16, 0.40);
  --text-muted: rgba(16, 16, 16, 0.25);

  --border-subtle: rgba(0, 0, 0, 0.07);
  --border-medium: rgba(0, 0, 0, 0.12);
  --border-strong: rgba(0, 0, 0, 0.85);

  --font-serif: "Instrument Serif", "Playfair Display", "Newsreader", "Times New Roman", "Songti SC", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Segoe UI", Roboto, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --spring-bouyant: cubic-bezier(0.34, 1.3, 0.64, 1);
  --spring-bouyant: linear(0, .0051, .0195, .0419, .071, .1058, .1451, .188, .2336, .2811, .3299, .3792, .4285, .4773, .5252, .5718, .6168, .66, .7012, .7402, .7768, .8111, .843, .8724, .8994, .924, .9463, .9663, .9841, .9999, 1.0136, 1.0255, 1.0357, 1.0442, 1.0512, 1.0568, 1.0612, 1.0643, 1.0665, 1.0677, 1.0681, 1.0677, 1.0667, 1.0652, 1.0632, 1.0609, 1.0582, 1.0553, 1.0522, 1.0489, 1.0456, 1.0423, 1.0389, 1.0356, 1.0323, 1.0291, 1.0261, 1.0231, 1.0203, 1.0177, 1.0152, 1.0129, 1.0107, 1.0087, 1.0068, 1.0052, 1.0037, 1.0023, 1.0011, 1, .9991, .9983, .9976, .997, .9965, .9961, .9958, .9956, .9955, .9954, .9954, .9954, .9955, .9956, .9957, .9959, .996, .9962, .9964, .9967, .9969, .9971, .9974, .9976, .9978, .998, .9982, .9984, .9986, .9988, 1);
  --ease-spring: cubic-bezier(0.34, 1.4, 0.64, 1);
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  --card-width-desktop: clamp(460px, 40vw, 620px);
  --card-width-tablet: clamp(400px, 62vw, 560px);
  --card-width-mobile: 78vw;
  --card-width: var(--card-width-desktop);
  --rail-gap: 28px;
}

@media (max-width: 1024px) {
  :root {
    --card-width: var(--card-width-tablet);
    --rail-gap: 22px;
  }
}

@media (max-width: 768px) {
  :root {
    --card-width: var(--card-width-mobile);
    --rail-gap: 16px;
  }
}

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

html {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  overflow-x: hidden;
}

html.lenis, html.lenis body {
  height: auto;
}
.lenis.lenis-smooth {
  scroll-behavior: auto !important;
}
.lenis.lenis-stopped {
  overflow: hidden;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
  line-height: 1.5;
}

::selection {
  background: #101010;
  color: #ffffff;
}

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

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

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

/* ---------------- Layout Framework ---------------- */
.site-wrapper {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}

@media (min-width: 768px) {
  .site-wrapper {
    padding: 0 48px;
  }
}

@media (min-width: 1200px) {
  .site-wrapper {
    padding: 0 64px;
  }
}

/* ---------------- Floating Navigation ---------------- */
.site-nav {
  position: fixed;
  top: 24px;
  left: 0;
  right: 0;
  z-index: 100;
  pointer-events: none;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 24px;
}

.site-nav-inner {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
  transition: transform 0.3s var(--ease-smooth), box-shadow 0.3s ease;
}

.site-nav-inner:hover {
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.07);
}

.nav-logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1px 4px 1px 2px;
  transition: transform 0.2s var(--ease-smooth);
}

.nav-logo-mark:hover {
  transform: scale(1.08);
}

.nav-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.16), 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.nav-logo-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #101010;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 15px;
  font-style: italic;
  font-weight: 500;
}

.nav-divider {
  width: 1px;
  height: 16px;
  background: var(--border-subtle);
  margin: 0 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-link-item a {
  display: block;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  font-weight: 450;
  color: var(--text-secondary);
  transition: color 0.12s, background-color 0.12s;
}

.nav-link-item a:hover {
  color: var(--text-primary);
  background-color: var(--bg-pill);
}

.nav-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-tertiary);
  padding: 4px 10px;
  background: var(--bg-pill);
  border-radius: var(--radius-pill);
  margin-left: 4px;
}

.nav-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulse 2.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

@media (max-width: 640px) {
  .nav-status { display: none; }
  .site-nav-inner { padding: 6px 10px; gap: 5px; }
  .nav-link-item a { padding: 7px 10px; font-size: 12.5px; }
  .nav-avatar { width: 25px; height: 25px; }
}

/* ---------------- Hero Section (Timeless Signature) ---------------- */
.hero-section {
  padding-top: 130px;
  padding-bottom: 60px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (max-width: 640px) {
  .hero-section {
    padding-top: 104px;
    padding-bottom: 44px;
  }
}

@media (min-width: 768px) {
  .hero-section {
    padding-top: 150px;
    padding-bottom: 80px;
  }
}

.hero-supertag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  font-weight: 500;
  margin-bottom: 24px;
  padding: 5px 12px;
  background: var(--bg-pill);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
}

.hero-supertag-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(48px, 7.8vw, 112px);
  line-height: 1.04;
  font-weight: 400;
  letter-spacing: -0.035em;
  color: var(--text-primary);
  margin-bottom: 48px;
  max-width: 1040px;
}

.hero-title .title-line {
  display: block;
}

.hero-title .serif-italic {
  font-style: italic;
  font-family: var(--font-serif);
  font-weight: 400;
  color: #101010;
}

.hero-chinese-sub {
  font-family: var(--font-sans);
  font-size: clamp(16px, 2.2vw, 22px);
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: -0.01em;
  max-width: 620px;
  margin: 0 auto 48px;
  line-height: 1.6;
}

/* ---------------- Hero Showreel Showcase (16:9 Video Canvas) ---------------- */
.hero-media-wrapper {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  padding: 0 8px;
}

.hero-media-glow {
  position: absolute;
  inset: -10%;
  background: radial-gradient(circle at center, rgba(0, 0, 0, 0.07) 0%, transparent 68%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.hero-media-card {
  position: relative;
  z-index: 1;
  aspect-ratio: 16 / 9;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: #0b0b0b;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 12px 36px rgba(0, 0, 0, 0.08),
    0 32px 72px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.06);
  transform: scale(0.96);
  transform-origin: center top;
  will-change: transform;
  transition: transform 0.6s var(--ease-smooth);
}

.hero-media-card video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media-badge {
  position: absolute;
  bottom: 20px;
  left: 24px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(16, 16, 16, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.hero-media-badge-pulse {
  width: 7px;
  height: 7px;
  background: #ff3b30;
  border-radius: 50%;
  box-shadow: 0 0 10px #ff3b30;
}

/* ---------------- Editorial Manifesto Statement ---------------- */
.manifesto-section {
  padding: 80px 0 60px;
  text-align: center;
}

@media (max-width: 640px) {
  .manifesto-section {
    padding: 56px 0 40px;
  }
}

.manifesto-text {
  font-family: var(--font-sans);
  font-size: 28px;
  line-height: 1.8;
  font-weight: 350;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  max-width: 670px;
  margin: 0 auto;
  text-align: center;
}

.manifesto-text p {
  margin-bottom: 1.5em;
}

.manifesto-text p:last-child {
  margin-bottom: 0;
}

.manifesto-text strong {
  font-weight: 600;
  color: #101010;
}

/* Signature Timeless Inline Badges */
.inline-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px 3px;
  vertical-align: middle;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 0.58em;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text-secondary);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
  transform: translateY(-2px);
  margin: 0 4px;
  white-space: nowrap;
}

.inline-badge-icon {
  width: 14px;
  height: 14px;
  display: inline-block;
}

.manifesto-metrics {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.metric-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.metric-number {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 44px);
  line-height: 1;
  font-weight: 400;
  color: var(--text-primary);
}

.metric-label {
  font-size: 13px;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

/* ---------------- Logo & Toolchain Marquee ---------------- */
.marquee-section {
  padding: 30px 0 80px;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
}

.marquee-heading {
  text-align: center;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  margin-bottom: 24px;
  font-weight: 500;
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: scrollMarquee 36s linear infinite;
  gap: 40px;
  align-items: center;
}

.marquee-track:hover {
  animation-play-state: paused;
}

@keyframes scrollMarquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.marquee-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  font-weight: 450;
  color: var(--text-secondary);
  white-space: nowrap;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.02);
  transition: transform 0.2s, border-color 0.2s, color 0.2s;
}

.marquee-item:hover {
  transform: translateY(-2px);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.marquee-item img {
  width: 20px;
  height: 20px;
  object-fit: contain;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: filter 0.2s, opacity 0.2s;
}

.marquee-item:hover img {
  filter: grayscale(0%);
  opacity: 1;
}

/* ---------------- Selected Work (Horizontal Blossom Rail) ---------------- */
.work-section {
  padding: 60px 0 40px;
  position: relative;
  scroll-margin-top: 100px;
}

.section-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 32px;
  padding: 0 4px;
}

@media (max-width: 768px) {
  .section-header-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 24px;
  }
  .work-controls {
    width: 100%;
    justify-content: space-between;
  }
}

.section-title-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.section-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  font-weight: 500;
}

.section-heading-serif {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4.5vw, 54px);
  line-height: 1.08;
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.work-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.work-filter-tabs {
  display: flex;
  background: var(--bg-pill);
  padding: 4px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
}

.filter-tab {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 450;
  transition: background-color 0.25s var(--ease-smooth), color 0.25s var(--ease-smooth), box-shadow 0.25s var(--ease-smooth);
}

.filter-tab:hover {
  color: var(--text-primary);
}

.filter-tab.active {
  background: #ffffff;
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.rail-arrows {
  display: flex;
  gap: 8px;
}

.rail-arrow-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-size: 14px;
  transition: background-color 0.25s var(--ease-smooth), border-color 0.25s var(--ease-smooth), transform 0.45s var(--spring-bouyant), box-shadow 0.25s var(--ease-smooth);
  will-change: transform;
}

.rail-arrow-btn:hover {
  background: #ffffff;
  border-color: var(--border-medium);
  transform: scale(1.08);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.rail-arrow-btn:active {
  transform: scale(0.92);
  transition-duration: 0.12s;
}

/* Horizontal Track (Rail) - Centered Spotlight with Right Peek (Reference Layout) */
.rail-container {
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  box-sizing: border-box;
  padding: 14px 5vw 44px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  scroll-behavior: auto;
}

.rail-container::-webkit-scrollbar {
  display: none;
}

.rail-container.is-dragging,
.rail-container.is-gliding {
  scroll-snap-type: none;
}

.rail-container.is-dragging,
.rail-container.is-dragging * {
  cursor: grabbing !important;
  user-select: none !important;
  -webkit-user-select: none !important;
}


.rail-track,
.rail-item,
.project-card-link,
.card-media-box,
.card-media-box img {
  -webkit-user-drag: none;
  user-select: none;
  -webkit-user-select: none;
}

.rail-track {
  display: flex;
  gap: var(--rail-gap);
  width: max-content;
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Project Card */
.rail-item {
  scroll-snap-align: center;
  width: var(--card-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}

.project-card-link {
  display: block;
  width: 100%;
  position: relative;
  cursor: pointer;
  outline: none;
}

.card-media-box {
  position: relative;
  aspect-ratio: 1024 / 780;
  width: 100%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background-color: rgba(0, 0, 0, 0.03);
  border: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  transition: transform 0.65s var(--spring-bouyant), box-shadow 0.65s var(--spring-bouyant);
  will-change: transform;
}

@media (hover: hover) {
  .project-card-link:hover .card-media-box {
    transform: scale(1.025);
    box-shadow: rgba(0, 0, 0, 0.19) 0px 32px 30px -16px;
  }
}

.project-card-link:active .card-media-box {
  transform: scale(0.985);
  box-shadow: 0 8px 16px -6px rgba(0, 0, 0, 0.1);
  transition-duration: 0.15s;
}

@media (prefers-reduced-motion: reduce) {
  .card-media-box {
    transition: none !important;
  }
}

/* Card Focus Highlight when returning from subpage */
@keyframes cardTargetPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  }
  35% {
    transform: translateY(-6px) scale(1.02);
    box-shadow: 0 24px 48px -8px rgba(0, 0, 0, 0.16), 0 0 0 3px rgba(16, 16, 16, 0.85);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  }
}

.rail-item.card-target-focus .card-media-box {
  animation: cardTargetPulse 1.8s var(--spring-bouyant);
}

.card-media-box img,
.card-media-box video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.card-tag-pill {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  border: 1px solid rgba(0, 0, 0, 0.06);
  z-index: 2;
  transition: background-color 0.3s var(--ease-smooth), box-shadow 0.3s var(--ease-smooth);
}

.project-card-link:hover .card-tag-pill {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Metadata Bar (Clean Editorial Style Matching Reference) */
.card-meta-row {
  margin-top: 18px;
  padding: 0 4px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.card-meta-text {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.card-title {
  font-size: 18px;
  font-weight: 550;
  color: var(--text-primary);
  opacity: 0.88;
  letter-spacing: -0.015em;
  line-height: 1.3;
  transition: opacity 0.3s var(--ease-smooth), color 0.3s var(--ease-smooth);
}

.card-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  opacity: 0.72;
  letter-spacing: -0.005em;
  line-height: 1.45;
  transition: opacity 0.3s var(--ease-smooth);
}

.project-card-link:hover .card-title {
  opacity: 1;
  color: #000000;
}

.project-card-link:hover .card-desc {
  opacity: 0.95;
}

.card-arrow {
  font-size: 17px;
  color: var(--text-primary);
  opacity: 0.42;
  font-family: var(--font-sans);
  display: inline-block;
  margin-top: 2px;
  margin-left: 14px;
  flex-shrink: 0;
  will-change: transform, opacity;
  transition: transform 0.45s var(--spring-bouyant), opacity 0.3s var(--ease-smooth);
}

.project-card-link:hover .card-arrow {
  opacity: 0.95;
  transform: translate(3px, -3px);
}

/* ---------------- Spotlight Showcase (Recollect Style) ---------------- */
.spotlight-section {
  padding: 60px 0 120px;
  position: relative;
  text-align: center;
  scroll-margin-top: 100px;
}

.spotlight-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 64px 32px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.03);
  position: relative;
  overflow: hidden;
  max-width: 1100px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .spotlight-wrapper {
    padding: 80px 64px;
  }
}

@media (max-width: 640px) {
  .spotlight-wrapper {
    padding: 44px 24px;
    border-radius: var(--radius-lg);
  }
}

.spotlight-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: 20px;
  font-weight: 500;
}

.spotlight-title {
  font-family: var(--font-serif);
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.1;
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.spotlight-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 20px;
  line-height: 1.6;
}

.spotlight-action {
  margin: 0 auto 36px;
  display: flex;
  justify-content: center;
}

.spotlight-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  font-weight: 450;
  color: var(--text-primary);
  text-decoration: none;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.02);
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.spotlight-link-btn:hover {
  transform: translateY(-2px);
  background-color: #ffffff;
  border-color: var(--border-medium);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.spotlight-btn-icon {
  width: 15px;
  height: 15px;
  opacity: 0.85;
}

.spotlight-link-btn .btn-arrow {
  font-size: 13px;
  color: var(--text-tertiary);
  transition: transform 0.2s ease, color 0.2s ease;
}

.spotlight-link-btn:hover .btn-arrow {
  color: var(--text-primary);
  transform: translate(2px, -2px);
}

/* ---------------- 3D Card Carousel (Bencho.dev 3D Turntable Ring) ---------------- */
.bencho-carousel-container {
  width: 100%;
  max-width: 760px;
  margin: 10px auto 30px;
  position: relative;
  user-select: none;
}

.car {
  position: relative;
  width: 640px;
  height: 380px;
  margin: 0 auto;
  user-select: none;
  -webkit-user-select: none;
}

/* 轮播宽度自适应容器：
   - ≤900px（小屏/窄窗/平板竖屏）：宽度不超过容器，避免固定 640px 溢出
   - >900px：桌面固定 640px */
@media (max-width: 900px) {
  .car {
    width: min(640px, 100%);
    height: 380px;
  }
}

@media (max-width: 640px) {
  .car {
    width: min(330px, 100%);
    height: 290px;
  }
}

.car-track {
  touch-action: pan-y;
  cursor: grab;
  position: absolute;
  inset: 0;
  outline: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
}

.car-track[data-held="true"] {
  cursor: grabbing;
}

.car-slot {
  transform-origin: 50% 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 210px;
  height: 276px;
  will-change: transform, z-index, opacity;
  transition: opacity 0.3s ease;
}

.car-float {
  perspective: 760px;
  width: 100%;
  height: 100%;
  animation: 6s ease-in-out infinite car-bob;
}

@keyframes car-bob {
  0%, 100% {
    transform: translateY(calc(var(--lift, 4px) * -1)) rotate(calc(var(--sway, 1deg) * -1));
  }
  50% {
    transform: translateY(var(--lift, 4px)) rotate(var(--sway, 1deg));
  }
}

.car-card {
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  width: 100%;
  height: 100%;
  position: relative;
  display: block;
  border-radius: 18px;
  box-shadow: 0 18px 42px -8px rgba(0, 0, 0, 0.4), 0 4px 12px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(255, 255, 255, 0.12) inset;
  overflow: hidden;
  transition: transform 0.18s ease-out, box-shadow 0.25s ease;
  cursor: grab;
  background-color: #1a1a1a;
}

.car-track[data-held="true"] .car-card {
  cursor: grabbing;
}

.car-sheen {
  pointer-events: none;
  display: block;
  position: absolute;
  inset: 0;
  border-radius: inherit;
  transition: opacity 0.25s ease;
}

/* Carousel Controls & Info */
.car-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin: 22px auto 0;
}

.car-arrow {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: #fff;
  color: var(--text-primary);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.2s, background-color 0.2s, color 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.car-arrow:hover {
  transform: scale(1.08);
  background: var(--text-primary);
  color: #fff;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
}

.car-arrow:active {
  transform: scale(0.96);
}

.car-active-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 260px;
  text-align: center;
}

.car-meta-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  transition: opacity 0.2s ease;
}

.car-meta-tag {
  font-size: 11.5px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

@media (max-width: 640px) {
  .bencho-carousel-container {
    margin-bottom: 20px;
  }
  .car {
    width: min(330px, 100%);
    height: 290px;
  }
  .car-slot {
    width: 136px;
    height: 182px;
  }
  .car-card {
    border-radius: 14px;
  }
  .car-controls {
    gap: 8px;
    margin: 14px auto 0;
  }
  .car-arrow {
    width: 34px;
    height: 34px;
    font-size: 13px;
    flex-shrink: 0;
  }
  .car-active-meta {
    min-width: 0;
    flex: 1 1 auto;
  }
  .car-meta-title {
    font-size: 12.5px;
    line-height: 1.35;
  }
  .car-meta-tag {
    font-size: 11px;
  }
}

.spotlight-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  background: var(--text-primary);
  color: #fff;
  font-size: 14.5px;
  font-weight: 500;
  transition: transform 0.2s, background-color 0.2s;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.spotlight-cta-btn:hover {
  transform: scale(1.03);
  background: #222222;
}

/* ---------------- About Profile Section (AIGC Visual Designer Positioning) ---------------- */
.about-profile-section {
  padding: 40px 0 60px;
  position: relative;
  scroll-margin-top: 100px;
}

.about-hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px 32px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.02);
  margin-bottom: 32px;
}

@media (min-width: 768px) {
  .about-hero-card {
    padding: 60px 52px;
  }
}

.about-intro-lead {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.25;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 20px;
  max-width: 900px;
}

.about-intro-lead .serif-italic {
  font-style: italic;
  font-family: var(--font-serif);
}

.about-intro-text {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 820px;
  margin-bottom: 32px;
}

.about-intro-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Metrics Row (plain, no cards) */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px 24px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

@media (min-width: 1024px) {
  .metrics-row {
    grid-template-columns: repeat(4, 1fr);
  }
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.metric-num {
  font-family: var(--font-serif);
  font-size: 40px;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
}

.metric-label {
  font-size: 13px;
  color: var(--text-tertiary);
  font-weight: 500;
}

/* ---------------- Capabilities & AI Stack (Streamlined Timeless Style) ---------------- */
.about-container {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 52px 32px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.03);
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}

@media (min-width: 768px) {
  .about-container {
    padding: 64px 48px;
  }
}

@media (max-width: 640px) {
  .about-container {
    padding: 40px 24px;
    border-radius: var(--radius-lg);
  }
}

.capabilities-header {
  margin-bottom: 36px;
  max-width: 800px;
  scroll-margin-top: 100px;
}

.capabilities-label-wrap {
  margin-bottom: 10px;
}

.capabilities-heading {
  font-family: var(--font-serif);
  font-size: clamp(30px, 4.4vw, 48px);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.capabilities-desc {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-secondary);
}

.capabilities-quote {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-secondary);
  background: rgba(0, 0, 0, 0.02);
  border-left: 2px solid #101010;
  padding: 12px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 16px;
}

.capabilities-quote strong {
  color: var(--text-primary);
  font-weight: 550;
}

.capabilities-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 860px) {
  .capabilities-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }
}

.cap-card {
  background: #fbfbf9;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  transition: transform 0.35s var(--spring-bouyant), border-color 0.25s ease, box-shadow 0.3s ease, background-color 0.25s ease;
  position: relative;
}

.cap-card:hover {
  background: #ffffff;
  transform: translateY(-4px);
  border-color: var(--border-medium);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.04);
}

.cap-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cap-num {
  font-family: var(--font-serif);
  font-size: 32px;
  font-style: italic;
  font-weight: 400;
  color: var(--text-tertiary);
  line-height: 1;
}

.cap-badge {
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  background: var(--bg-pill);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
}

.cap-card-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cap-title {
  font-size: 18.5px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.cap-body {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}

.cap-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-subtle);
}

.cap-tag {
  font-size: 12px;
  font-weight: 450;
  color: var(--text-secondary);
  background: rgba(0, 0, 0, 0.03);
  padding: 3px 9px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  transition: color 0.2s, border-color 0.2s;
}

.cap-card:hover .cap-tag {
  color: var(--text-primary);
  border-color: rgba(0, 0, 0, 0.15);
}

/* Integrated Knowledge Base Bar */
.capabilities-wiki-bar {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

@media (min-width: 860px) {
  .capabilities-wiki-bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.cap-wiki-info {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.cap-wiki-title {
  font-size: 13.5px;
  font-weight: 550;
  color: var(--text-primary);
}

.cap-wiki-desc {
  font-size: 12.5px;
  color: var(--text-tertiary);
}

.cap-wiki-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.cap-wiki-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.25s var(--ease-smooth);
}

.cap-wiki-link .wiki-arrow {
  font-size: 12px;
  color: var(--text-tertiary);
  transition: transform 0.25s var(--ease-spring), color 0.2s ease;
}

.cap-wiki-link:hover {
  background: #101010;
  color: #ffffff;
  border-color: #101010;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.cap-wiki-link:hover .wiki-arrow {
  color: #ffffff;
  transform: translate(2px, -2px);
}

/* About & Contact Integration */
.about-contact-wrap {
  margin-top: 56px;
  padding-top: 48px;
  text-align: center;
  scroll-margin-top: 100px;
  scroll-margin-top: 100px;
}

.about-contact-intro {
  max-width: 680px;
  margin: 0 auto 32px;
}

.about-contact-title {
  font-family: var(--font-serif);
  font-size: clamp(30px, 4.5vw, 44px);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-top: 10px;
  margin-bottom: 12px;
}

.about-contact-subtitle {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text-secondary);
}

.about-contact-wrap .footer-contact-pills {
  margin-bottom: 0;
}

/* ---------------- Knowledge Base & Methodology ---------------- */
.knowledge-section {
  padding: 80px 0 110px;
}

.principles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 64px;
}

@media (min-width: 768px) {
  .principles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.principle-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform 0.3s, border-color 0.3s;
}

.principle-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-medium);
}

.principle-num {
  font-family: var(--font-serif);
  font-size: 26px;
  font-style: italic;
  color: var(--text-tertiary);
}

.principle-title {
  font-size: 18px;
  font-weight: 550;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.principle-text {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Feishu Wiki Cards */
.wiki-cards-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 768px) {
  .wiki-cards-row {
    grid-template-columns: repeat(3, 1fr);
  }
}

.wiki-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.wiki-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-medium);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);
}

.wiki-card-info h4 {
  font-size: 15px;
  font-weight: 550;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.wiki-card-info p {
  font-size: 13px;
  color: var(--text-tertiary);
}

.wiki-card-icon {
  font-size: 16px;
  color: var(--text-secondary);
}

/* ---------------- Footer (Timeless Wordmark & Contact Grid) ---------------- */
.site-footer {
  padding: 72px 0 60px;
  text-align: center;
  position: relative;
}

.footer-wordmark {
  font-family: var(--font-serif);
  font-size: clamp(64px, 14vw, 190px);
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 0.9;
  color: #101010;
  user-select: none;
  margin-bottom: 48px;
  transition: opacity 0.3s;
}

.footer-wordmark:hover {
  opacity: 0.85;
}

.footer-contact-pills {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  max-width: 800px;
  margin: 0 auto 48px;
}

.contact-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  font-weight: 450;
  color: var(--text-primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.02);
  transition: transform 0.2s, background-color 0.2s, border-color 0.2s;
  position: relative;
}

@media (max-width: 640px) {
  .footer-contact-pills {
    gap: 10px;
  }
  .contact-pill-btn {
    padding: 8px 14px;
    font-size: 12.5px;
    gap: 6px;
  }
}

.contact-pill-btn:hover {
  transform: translateY(-2px);
  background-color: #fff;
  border-color: var(--border-medium);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.contact-pill-btn svg,
.contact-pill-btn .contact-pill-icon {
  width: 16px;
  height: 16px;
  opacity: 0.75;
  border-radius: 3px;
  flex-shrink: 0;
  transition: opacity 0.2s;
}

.contact-pill-btn:hover svg,
.contact-pill-btn:hover .contact-pill-icon {
  opacity: 1;
}

/* QR Code Popovers */
.qr-popover {
  position: absolute;
  bottom: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: #ffffff;
  padding: 14px;
  width: 168px;
  box-sizing: border-box;
  border-radius: var(--radius-md);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.04);
  border: 1px solid var(--border-subtle);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s var(--ease-smooth), transform 0.25s var(--ease-smooth);
  z-index: 999;
}

.qr-popover::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: #ffffff transparent transparent transparent;
}

.contact-pill-btn:hover .qr-popover {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.qr-popover img {
  width: 140px !important;
  height: 140px !important;
  max-width: none !important;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: 6px;
  display: block;
  margin: 0 auto;
}

.qr-popover-caption {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 8px;
  text-align: center;
  white-space: nowrap;
}

/* Toast Message */
.copy-toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(30px);
  background: #101010;
  color: #ffffff;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease-spring), transform 0.3s var(--ease-spring);
  z-index: 1000;
}

.copy-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.footer-bottom-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-tertiary);
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.footer-right {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin: 0;
}

.footer-bottom-line a,
.footer-bottom-line button {
  color: inherit;
  font: inherit;
  font-size: inherit;
  letter-spacing: inherit;
  line-height: inherit;
  text-decoration: none;
  background: none;
  border: none;
  border-radius: 0;
  -webkit-appearance: none;
  appearance: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  transition: color 0.2s ease;
}

.footer-bottom-line a:hover,
.footer-bottom-line button:hover {
  color: var(--text-primary);
}

@media (max-width: 640px) {
  .footer-bottom-line {
    flex-direction: column;
    gap: 12px;
  }
  .footer-right { gap: 10px; }
}

/* ==========================================================================
   Mobile Typography Refinements (placed after all base rules so they win
   the cascade on small screens)
   ========================================================================== */
@media (max-width: 640px) {
  .hero-title {
    font-size: clamp(34px, 9.6vw, 46px);
    line-height: 1.06;
    margin-bottom: 30px;
  }
  .hero-supertag {
    margin-bottom: 18px;
  }
  .manifesto-text {
    font-size: 20px;
    line-height: 1.75;
    max-width: 100%;
  }
  .spotlight-title {
    font-size: clamp(28px, 7.4vw, 36px);
    line-height: 1.15;
  }
  .spotlight-desc {
    font-size: 14.5px;
  }
  .capabilities-heading {
    font-size: clamp(26px, 7vw, 34px);
    line-height: 1.18;
  }
  .capabilities-quote {
    font-size: 13.5px;
  }
  .cap-title {
    font-size: 17px;
  }
  .about-contact-title {
    font-size: clamp(28px, 8vw, 36px);
  }
}