/* ============================================
   HELILAB — 合理实验室
   Portfolio Website Styles
   ============================================ */

/* --- CSS Variables --- */
:root {
  --bg:          #0a0a0f;
  --bg-elevated: #111118;
  --bg-card:     #14141e;
  --accent:      #00d4ff;
  --accent-dim:  rgba(0, 212, 255, 0.08);
  --accent-glow: rgba(0, 212, 255, 0.15);
  --text:        #e8e8ec;
  --text-secondary: #8888a0;
  --text-muted:  #555568;
  --border:      rgba(255, 255, 255, 0.06);
  --border-hover:rgba(0, 212, 255, 0.3);
  --nav-width:   64px;
  --nav-mobile-height: 56px;
  --font-display:'Syne', 'Noto Sans SC', sans-serif;
  --font-mono:   'DM Mono', 'Noto Sans SC', monospace;
  --font-sans:   'Noto Sans SC', 'DM Mono', sans-serif;
  --radius:      8px;
  --radius-lg:   12px;
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

::selection {
  background: rgba(0, 212, 255, 0.25);
  color: #fff;
}

/* --- Grain Overlay --- */
.grain-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* --- Navigation (Desktop - Left Sidebar) --- */
.nav {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--nav-width);
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 0;
  z-index: 100;
  gap: 8px;
}

.nav-logo {
  margin-bottom: 16px;
}

.nav-logo-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  transition: transform 0.3s var(--ease-out);
}

.nav-logo-link:hover {
  transform: scale(1.1);
}

.nav-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 8px;
  border-radius: var(--radius);
  transition: all 0.25s var(--ease-out);
  color: var(--text-muted);
  position: relative;
}

.nav-link:hover {
  color: var(--text);
  background: var(--accent-dim);
}

.nav-link.active {
  color: var(--accent);
}

.nav-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 20px;
  background: var(--accent);
  border-radius: 1px;
}

.nav-link-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-link-icon svg {
  width: 18px;
  height: 18px;
}

.nav-link-text {
  font-size: 9px;
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.nav-footer {
  padding-top: 16px;
  border-top: 1px solid var(--border);
  width: 100%;
  display: flex;
  justify-content: center;
}

.nav-github {
  color: var(--text-muted);
  transition: color 0.2s ease;
}
.nav-github:hover {
  color: var(--accent);
}
.nav-github svg {
  width: 16px;
  height: 16px;
  display: block;
}
.nav-version {
  font-size: 9px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* --- Mobile Navigation --- */
.nav-mobile {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--nav-mobile-height);
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  z-index: 100;
  justify-content: space-around;
  align-items: center;
  padding: 0 16px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-mobile-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 16px;
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: color 0.25s var(--ease-out);
}

.nav-mobile-link svg {
  width: 20px;
  height: 20px;
}

.nav-mobile-link span {
  font-size: 10px;
  font-family: var(--font-sans);
  font-weight: 500;
}

.nav-mobile-link.active {
  color: var(--accent);
}

/* --- Main Content Area --- */
.main {
  margin-left: var(--nav-width);
  min-height: 100vh;
  padding: 0;
  position: relative;
}

/* --- Page Transitions --- */
.page {
  opacity: 0;
  transform: translateY(12px);
  animation: pageIn 0.5s var(--ease-out) forwards;
}

@keyframes pageIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Scroll Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ============================================
   PAGE: HOME
   ============================================ */

.home {
  padding: 60px 48px 80px;
  max-width: 1600px;
  position: relative;
}

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  min-height: 70vh;
  padding-top: 8vh;
}

.hero-left {
  position: relative;
}

.hero-label {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-label::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(48px, 7vw, 88px);
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 32px;
  white-space: nowrap;
}

.hero-title .accent {
  color: var(--accent);
}

.hero-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 420px;
  font-family: var(--font-sans);
}

.hero-desc strong {
  color: var(--text);
  font-weight: 500;
}

.hero-cta {
  margin-top: 40px;
  display: flex;
  gap: 16px;
  align-items: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.25s var(--ease-out);
  text-decoration: none;
}

.btn-primary:hover {
  background: #33ddff;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary svg {
  width: 16px;
  height: 16px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.25s var(--ease-out);
  text-decoration: none;
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--border-hover);
  background: var(--accent-dim);
}

/* Hero Right - Decorative & Stats */
.hero-right {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-top: 16px;
}

.hero-grid-bg {
  position: absolute;
  top: -40px;
  right: -40px;
  width: 300px;
  height: 300px;
  background-image:
    radial-gradient(circle at 1px 1px, var(--text-muted) 0.5px, transparent 0.5px);
  background-size: 20px 20px;
  opacity: 0.15;
  pointer-events: none;
}

.hero-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.hero-stat-num {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-sans);
}

.hero-coords {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  padding-top: 24px;
  letter-spacing: 0.05em;
  line-height: 2;
}

.hero-coords span {
  color: var(--text-secondary);
}

/* Featured Projects Section on Home */
.featured {
  padding: 80px 0 40px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
}

.section-label {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-label::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.section-link {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.25s;
}

.section-link:hover {
  color: var(--accent);
}

.section-link svg {
  width: 14px;
  height: 14px;
}

/* ============================================
   PROJECT CARDS
   ============================================ */

.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 40px;
}

.project-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  cursor: pointer;
  transition: all 0.35s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: border-color 0.35s var(--ease-out);
  pointer-events: none;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--border-hover);
}

.project-card:hover .card-image-placeholder {
  opacity: 1;
}

.project-card:hover .card-arrow {
  transform: translate(4px, -4px);
  color: var(--accent);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-num {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.card-arrow {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: all 0.3s var(--ease-out);
}

.card-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.2;
}

.card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  font-family: var(--font-sans);
}

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

.card-tag {
  padding: 3px 10px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 11px;
  font-family: var(--font-mono);
  border-radius: 20px;
  border: 1px solid rgba(0, 212, 255, 0.1);
  transition: all 0.25s var(--ease-out);
}

.project-card:hover .card-tag {
  border-color: rgba(0, 212, 255, 0.25);
}

.card-image-placeholder {
  margin-top: 24px;
  height: 180px;
  border-radius: var(--radius);
  opacity: 0.7;
  transition: opacity 0.35s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.card-image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
}

.project-card:hover .card-image-placeholder img {
  opacity: 0.9;
}

.card-image-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* Card placeholder themes per project */
.card-placeholder-nuxtmr {
  background: linear-gradient(135deg, #0d1117 0%, #1a1a2e 50%, #0a2540 100%);
}

.card-placeholder-nuxtmr::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 30px 30px;
}

.card-placeholder-hyperos {
  background: linear-gradient(135deg, #0d1117 0%, #161b22 50%, #0d1117 100%);
}

.card-placeholder-hyperos::before {
  content: '';
  position: absolute;
  width: 80px;
  height: 80px;
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 40px rgba(0, 212, 255, 0.05);
}

.card-placeholder-novel {
  background: linear-gradient(135deg, #0d1117 0%, #1a1025 50%, #0d1117 100%);
}

.card-placeholder-novel::before {
  content: '';
  position: absolute;
  inset: 20px;
  border: 1px solid rgba(0, 212, 255, 0.1);
  border-radius: 4px;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 8px,
    rgba(0, 212, 255, 0.03) 8px,
    rgba(0, 212, 255, 0.03) 9px
  );
}

.card-placeholder-quarantine {
  background: linear-gradient(135deg, #0d1117 0%, #0d1f2d 50%, #0d1117 100%);
}

.card-placeholder-quarantine::before {
  content: '';
  position: absolute;
  width: 50px;
  height: 60px;
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 6px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.card-placeholder-quarantine::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 8px;
  border-bottom: 2px solid rgba(0, 212, 255, 0.3);
  border-radius: 0 0 4px 4px;
  top: calc(50% + 20px);
  left: 50%;
  transform: translateX(-50%);
  border: none;
}

.card-placeholder-hyperdata {
  background: linear-gradient(135deg, #0d1117 0%, #0d1a2e 50%, #0d1117 100%);
}

.card-placeholder-hyperdata::before {
  content: '';
  position: absolute;
  inset: 16px;
  border: 1px solid rgba(0, 212, 255, 0.08);
  border-radius: 4px;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 40px,
    rgba(0, 212, 255, 0.04) 40px,
    rgba(0, 212, 255, 0.04) 41px
  );
}

.card-placeholder-mrdata {
  background: linear-gradient(135deg, #0d1117 0%, #1a1520 50%, #0d1117 100%);
}

.card-placeholder-mrdata::before {
  content: '';
  position: absolute;
  width: 60px;
  height: 60px;
  border: 1px solid rgba(0, 212, 255, 0.12);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.card-placeholder-mrdata::after {
  content: '';
  position: absolute;
  width: 30px;
  height: 30px;
  border: 1px solid rgba(0, 212, 255, 0.08);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.card-placeholder-hub {
  background: linear-gradient(135deg, #0d1117 0%, #1a1520 50%, #0d1117 100%);
}

.card-placeholder-hub::before {
  content: '';
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.5);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.card-placeholder-hub::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(0, 212, 255, 0.06) 1px, transparent 1px) 0 0 / 28px 28px,
    linear-gradient(90deg, rgba(0, 212, 255, 0.06) 1px, transparent 1px) 0 0 / 28px 28px;
}

.card-placeholder-miroms {
  background: linear-gradient(135deg, #0d1117 0%, #0d1a2e 50%, #0d1117 100%);
}

.card-placeholder-miroms::before {
  content: '';
  position: absolute;
  inset: 24px;
  border: 1px solid rgba(0, 212, 255, 0.1);
  border-radius: 4px;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 14px,
    rgba(0, 212, 255, 0.05) 14px,
    rgba(0, 212, 255, 0.05) 15px
  );
}

.card-placeholder-docsniffer {
  background: linear-gradient(135deg, #0d1117 0%, #1a1a2e 50%, #0d1117 100%);
}

.card-placeholder-docsniffer::before {
  content: '';
  position: absolute;
  inset: 20px;
  border: 1px solid rgba(0, 212, 255, 0.12);
  border-radius: 4px;
  background:
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px) 0 0 / 20px 20px;
}

.card-placeholder-docsniffer::after {
  content: '';
  position: absolute;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 6px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 212, 255, 0.08);
}

/* Featured grid - first card spans full width on larger screens */
.featured-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px 40px;
}

.featured-grid .project-card:first-child {
  grid-row: span 2;
}

.featured-grid .project-card:first-child .card-image-placeholder {
  height: 360px;
}

/* ============================================
   PAGE: PROJECTS LIST
   ============================================ */

.projects-page {
  padding: 60px 48px 80px;
  max-width: 1600px;
}

.page-header {
  margin-bottom: 48px;
  padding-top: 8vh;
}

.page-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  max-width: 480px;
}

.projects-list-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 40px;
}

/* ============================================
   PAGE: PROJECT DETAIL
   ============================================ */

.detail-page {
  padding: 60px 48px 80px;
  max-width: 1600px;
}

.detail-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 40px;
  padding-top: 8vh;
  transition: color 0.25s;
}

.detail-back:hover {
  color: var(--accent);
}

.detail-back svg {
  width: 14px;
  height: 14px;
}

.detail-header {
  margin-bottom: 48px;
}

.detail-num {
  font-family: var(--font-display);
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.detail-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.detail-tagline {
  font-size: 16px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  max-width: 560px;
  line-height: 1.7;
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.detail-tag {
  padding: 5px 14px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 12px;
  font-family: var(--font-mono);
  border-radius: 20px;
  border: 1px solid rgba(0, 212, 255, 0.1);
}

.detail-github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.25s ease;
}
.detail-github-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.15);
}

.detail-github-repo {
  color: var(--text);
  font-weight: 500;
}

/* Detail Grid */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.detail-section-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.detail-section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.detail-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-family: var(--font-sans);
}

.detail-text p + p {
  margin-top: 12px;
}

.detail-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.detail-list li {
  font-size: 13px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}

.detail-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border: 1px solid var(--accent);
  border-radius: 50%;
}

/* Detail Visual Area */
.detail-visual {
  margin-bottom: 48px;
}

.detail-visual-placeholder {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.detail-visual-placeholder img {
  width: 100%;
  display: block;
  border-radius: var(--radius-lg);
}

.detail-visual-placeholder.detail-visual-zoom {
  cursor: zoom-in;
  padding: 0;
  background: none;
  border: 1px solid var(--border);
  text-align: left;
  font: inherit;
  color: inherit;
  display: block;
}

.detail-visual-zoom img {
  display: block;
  width: 100%;
  border-radius: var(--radius-lg);
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity .3s ease;
}

.lightbox.lightbox-open {
  opacity: 1;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(6, 6, 10, 0.92);
  backdrop-filter: blur(8px);
}

.lightbox-figure {
  position: relative;
  max-width: calc(100vw - 96px);
  max-height: calc(100vh - 120px);
  z-index: 1;
}

.lightbox-figure img {
  max-width: 100%;
  max-height: calc(100vh - 120px);
  display: block;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
}

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 28px;
  z-index: 2;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(0, 212, 255, 0.3);
  background: rgba(10, 10, 15, 0.6);
  color: var(--accent);
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: background .2s ease, transform .2s ease;
}

.lightbox-close:hover {
  background: rgba(0, 212, 255, 0.15);
  transform: scale(1.08);
}

.lightbox-close svg {
  width: 22px;
  height: 22px;
}

@media (max-width: 768px) {
  .lightbox-figure {
    max-width: calc(100vw - 24px);
    max-height: calc(100vh - 96px);
  }

  .lightbox-figure img {
    max-height: calc(100vh - 96px);
  }

  .lightbox-close {
    top: 16px;
    right: 16px;
  }
}

.detail-visual-label {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  z-index: 1;
}

/* Detail Links */
.detail-links {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 48px;
}

/* ============================================
   PAGE: ABOUT
   ============================================ */

.about-page {
  padding: 60px 48px 80px;
  max-width: 1600px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  margin-top: 48px;
}

.about-intro {
  font-size: 18px;
  line-height: 1.9;
  color: var(--text-secondary);
  font-family: var(--font-sans);
}

.about-intro .highlight {
  color: var(--accent);
  font-weight: 500;
}

.about-section {
  margin-top: 48px;
}

.about-section-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.about-section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.about-tech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-tech-card {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.25s var(--ease-out);
}

.about-tech-card:hover {
  border-color: var(--border-hover);
}

.about-tech-card h4 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.about-tech-card p {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  line-height: 1.6;
}

.about-contact {
  margin-top: 48px;
}

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

.contact-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.25s var(--ease-out);
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.contact-link:hover {
  border-color: var(--border-hover);
  color: var(--accent);
  background: var(--accent-dim);
}

.contact-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.contact-link .label {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  min-width: 60px;
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
  padding: 40px 48px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.footer-text .accent {
  color: var(--accent);
}

.footer-visit {
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.footer-visit [data-visit] {
  color: var(--accent);
  font-family: var(--font-mono);
}

/* ============================================
   RESPONSIVE — Tablet
   ============================================ */

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 4vh;
  }

  .hero-right {
    padding-top: 0;
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .featured-grid .project-card:first-child {
    grid-row: span 1;
  }

  .detail-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ============================================
   RESPONSIVE — Mobile
   ============================================ */

@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .nav-mobile {
    display: flex;
  }

  .main {
    margin-left: 0;
    padding-bottom: calc(var(--nav-mobile-height) + 20px);
  }

  .home,
  .projects-page,
  .detail-page,
  .about-page {
    padding: 40px 20px 60px;
  }

  .home {
    padding-top: 40px;
  }

  .hero-title {
    font-size: clamp(36px, 10vw, 56px);
  }

  .projects-grid,
  .projects-list-grid {
    grid-template-columns: 1fr;
  }

  .project-card {
    padding: 24px;
  }

  .card-image-placeholder {
    display: block;
    height: auto;
    min-height: 240px;
    aspect-ratio: 3 / 2;
    border-radius: var(--radius);
    overflow: hidden;
  }

  .card-image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: left top;
    display: block;
    border-radius: var(--radius);
  }

  .about-tech-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    padding: 30px 20px;
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .hero-stat-num {
    font-size: 32px;
  }

  .detail-links {
    flex-direction: column;
  }

  .contact-link {
    padding: 12px 16px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 32px;
  }

  .page-title {
    font-size: 28px;
  }

  .detail-title {
    font-size: 28px;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary, .btn-ghost {
    justify-content: center;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.05); }
  50% { box-shadow: 0 0 40px rgba(0, 212, 255, 0.1); }
}

.hero-grid-bg {
  animation: float 8s ease-in-out infinite;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}