/* ============================================
   拓扑无界 v3 — MUJI/原研哉 极简
   设计令牌：留白即奢侈，作品即主角
   ============================================ */

:root {
  --ground: #FAFAF8;
  --ink: #1A1A1A;
  --ink-secondary: #6B6B66;
  --ink-tertiary: #9B9B96;
  --hairline: #E8E8E2;
  --hairline-dark: #D5D5CE;
  --brand: #3070D0;
  --white: #FFFFFF;

  --font-sans: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;

  /* Typography tokens */
  --text-xs: 11px;
  --text-sm: 12px;
  --text-base-sm: 13px;
  --text-base: 15px;
  --text-md: 18px;
  --text-lg: 20px;
  --text-display: 42px;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 32px;
  --space-lg: 64px;
  --space-xl: 120px;
  --space-xxl: 200px;

  --max-width: 1400px;
  --nav-height: 60px;

  --transition: 0.3s ease;
  --transition-slow: 0.6s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  background: var(--ground);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.8;
  background: var(--ground);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* Skip navigation */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  z-index: 2000;
  padding: var(--space-xs) var(--space-sm);
  background: var(--ink);
  color: var(--white);
  font-size: var(--text-base-sm);
  border-radius: 0 0 4px 4px;
}
.skip-link:focus-visible {
  top: 0;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

/* Section label */
.section-label {
  font-size: var(--text-base-sm);
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--ink-secondary);
  margin-bottom: var(--space-lg);
}

.section-note {
  font-size: 14px;
  color: var(--ink-secondary);
  margin-top: calc(-1 * var(--space-lg) + var(--space-sm)); /* tight below section-label */
  margin-bottom: var(--space-lg);
}

/* ==================== NAVBAR ==================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1100;
  height: var(--nav-height);
  background: rgba(250,250,248,0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo { display: flex; align-items: center; gap: 10px; }
.logo-icon {
  display: block;
  height: 44px;
  width: 44px;
  background-color: var(--ink-secondary);
  mask-image: url('../assets/logo/拓扑无界_logo_白色透明.png');
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  -webkit-mask-image: url('../assets/logo/拓扑无界_logo_白色透明.png');
  -webkit-mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center;
}
.logo-text {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--ink-secondary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
  list-style: none;
}

.nav-links a {
  font-size: var(--text-base-sm);
  font-weight: 400;
  color: var(--ink-secondary);
  transition: color var(--transition);
}

/* Hamburger toggle — hidden on desktop */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1100;
}
.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.open .nav-toggle-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.open .nav-toggle-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ==================== HERO ==================== */
.hero {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-xxl);
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-xl);
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--space-lg);
  padding-right: 0;
}

.hero-text {
  padding-right: var(--space-lg);
}

.hero-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--ink-secondary);
  margin-bottom: var(--space-md);
}

.hero-title {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 300;
  letter-spacing: -1px;
  line-height: 1.15;
  color: var(--ink);
  margin-bottom: var(--space-md);
  white-space: nowrap;
}

.hero-title-en {
  display: block;
  font-size: 16px;
  font-weight: 400;
  letter-spacing: 10px;
  text-transform: uppercase;
  color: var(--ink-secondary);
  margin-top: var(--space-sm);
}

.hero-desc {
  font-size: var(--text-md);
  color: var(--ink-secondary);
  line-height: 1.7;
}

.hero-image {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 0;
  margin-left: -200px;
}

.hero-image img {
  width: 100%;
  height: auto;
  transform: scale(1.2);
}

/* ==================== ABOUT ==================== */
.about {
  padding: var(--space-xxl) 0;
}

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

.about-lead p {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--ink);
}

.about-detail p {
  font-size: var(--text-base);
  color: var(--ink-secondary);
  line-height: 1.9;
  margin-bottom: var(--space-lg);
}

.about-stats {
  display: flex;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--hairline);
}

.stat-num {
  display: block;
  font-size: var(--text-display);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -1px;
  line-height: 1.2;
}

.stat-label {
  display: block;
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  letter-spacing: 1px;
  margin-top: 2px;
}

/* ==================== BUSINESS ==================== */
.business {
  padding: var(--space-xxl) 0;
  border-top: 1px solid var(--hairline);
}

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

.business-card {
  transition: none;
}

.biz-img {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--hairline);
  position: relative;
}

.biz-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.biz-img-edit {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: rgba(0,0,0,0.45);
  z-index: 5;
}
.admin-active .biz-img-edit { display: flex; }

/* Clickable cursor hint in admin mode */
.admin-active .biz-img { cursor: pointer; }
.admin-active .biz-img img { pointer-events: none; } /* prevent img drag */

.biz-img-edit .item-admin-btn { font-size: 12px; padding: 5px 12px; }
.biz-img-edit .biz-restore-btn { background: rgba(255,255,255,0.15); }

.biz-body {
  padding: var(--space-md) var(--space-sm);
}

.biz-body h3 {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: var(--space-sm);
}

.biz-body ul {
  list-style: none;
  padding: 0;
}

.biz-body li {
  font-size: var(--text-base-sm);
  color: var(--ink-secondary);
  line-height: 1.6;
  padding: 3px 0;
}

/* ==================== SERVICES ==================== */
.section-sub-label {
  font-size: var(--text-base-sm);
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--ink-secondary);
  margin: var(--space-lg) 0 var(--space-md);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--hairline);
}

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

.service-item {
  max-width: 480px;
}

.service-item h3 {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: var(--space-xs);
}

.service-item p {
  font-size: 14px;
  color: var(--ink-secondary);
  line-height: 1.8;
}

/* ==================== PORTFOLIO ==================== */
.portfolio {
  padding: var(--space-xxl) 0;
  border-top: 1px solid var(--hairline);
}

.portfolio-filter {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.filter-btn {
  background: none;
  border: none;
  font-size: var(--text-base-sm);
  font-family: inherit;
  color: var(--ink-secondary);
  cursor: pointer;
  padding: 0;
  transition: color var(--transition);
  letter-spacing: 1px;
}

.filter-btn.active { color: var(--ink); }

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

.portfolio-item { cursor: pointer; }
.portfolio-item.hidden { display: none; }

.portfolio-item img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  background: var(--hairline);
  margin-bottom: 10px;
  transition: opacity var(--transition);
}

.item-caption .item-year {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--brand);
}

.item-caption h4 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--ink);
  margin: 2px 0;
}

.item-caption p {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  line-height: 1.5;
}

/* ==================== 3D MODELS ==================== */
.models {
  padding: var(--space-xxl) 0;
  border-top: 1px solid var(--hairline);
}

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

.model-card {
  display: block;
  position: relative;
}

.model-preview {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--hairline);
  position: relative;
}

.model-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.model-overlay {
  position: absolute;
  inset: 0;
  background: rgba(26,26,26,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.model-overlay span {
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 1px;
}

.model-caption { padding: var(--space-sm) 0; }

.model-caption h4 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

.model-caption p {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
}

.model-preview-empty {
  aspect-ratio: 16/10;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--hairline);
  border: 1px dashed var(--hairline-dark);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.model-preview-empty:hover { border-color: var(--brand); background: rgba(48,112,208,0.03); }

.model-preview-empty span {
  font-size: 36px;
  color: var(--hairline-dark);
  font-weight: 300;
}

/* ==================== TECH STACK ==================== */
.tech {
  padding: var(--space-xxl) 0;
  border-top: 1px solid var(--hairline);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.tech-item {
  text-align: center;
  padding: var(--space-lg) var(--space-sm);
  background: var(--ground);
  transition: background 0.25s;
}

.tech-item:hover {
  background: #fff;
}

.tech-icon {
  width: 32px;
  height: 32px;
  margin: 0 auto var(--space-sm);
  color: var(--ink-secondary);
}

.tech-icon svg { width: 100%; height: 100%; }

.tech-item h4 {
  font-size: var(--text-base-sm);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.tech-item p {
  font-size: 12px;
  color: var(--ink-tertiary);
  line-height: 1.4;
}

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

@media (max-width: 480px) {
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ==================== CONTACT ==================== */
.contact {
  padding: var(--space-xxl) 0;
  border-top: 1px solid var(--hairline);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.contact-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-secondary);
  margin-bottom: var(--space-xs);
}

.contact-item a,
.contact-item p:last-child {
  font-size: var(--text-base);
  color: var(--ink);
}

/* ==================== FOOTER ==================== */
.footer {
  padding: var(--space-xl) 0 var(--space-lg);
  border-top: 1px solid var(--hairline);
}

.footer-top { margin-bottom: var(--space-lg); display: flex; align-items: center; gap: 8px; }
.footer-logo-icon {
  display: block;
  height: 44px;
  width: 44px;
  background-color: var(--ink-secondary);
  mask-image: url('../assets/logo/拓扑无界_logo_白色透明.png');
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  -webkit-mask-image: url('../assets/logo/拓扑无界_logo_白色透明.png');
  -webkit-mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center;
}
.footer-logo-text {
  font-size: var(--text-base-sm);
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--ink-secondary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
}

.footer-bottom p {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
}

/* ==================== LIGHTBOX ==================== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.lightbox.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20,20,18,0.92);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.lightbox-panel {
  position: relative;
  z-index: 1;
  width: min(90vw, 1100px);
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  background: var(--ground);
  padding: 48px var(--space-lg) var(--space-md);
}

.lightbox-close {
  position: absolute;
  top: 12px; right: 16px;
  background: none;
  border: none;
  font-size: 28px;
  font-weight: 300;
  color: var(--ink-secondary);
  cursor: pointer;
  line-height: 1;
  padding: 4px 8px;
  transition: color var(--transition);
}
.lightbox-close:hover { color: var(--ink); }

.lightbox-gallery {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 1;
  min-height: 0;
}

.lightbox-arrow {
  flex-shrink: 0;
  background: none;
  border: none;
  font-size: 48px;
  font-weight: 200;
  color: var(--ink-secondary);
  cursor: pointer;
  padding: 12px;
  line-height: 1;
  transition: color var(--transition);
}
.lightbox-arrow:hover { color: var(--ink); }

.lightbox-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  max-height: 62vh;
  overflow: hidden;
}

.lightbox-img {
  max-width: 100%;
  max-height: 62vh;
  object-fit: contain;
  transition: opacity 0.25s ease;
}
.lightbox-img.loading { opacity: 0; }

.lightbox-caption {
  text-align: center;
  padding-top: var(--space-md);
  padding-bottom: 4px;
}

.lightbox-year {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--brand);
}

.lightbox-title {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--ink);
  margin: 2px 0 4px;
}

.lightbox-desc {
  font-size: var(--text-base-sm);
  color: var(--ink-secondary);
  line-height: 1.6;
  max-width: 560px;
  margin: 0 auto;
}

.lightbox-counter {
  font-size: var(--text-xs);
  color: var(--ink-secondary);
  margin-top: var(--space-xs);
  letter-spacing: 1px;
}

@media (max-width: 768px) {
  .lightbox-panel { padding: 40px var(--space-sm) var(--space-sm); }
  .lightbox-arrow { font-size: 32px; padding: 8px; }
  .lightbox-gallery { gap: 4px; }
  .lightbox-stage { min-height: 200px; max-height: 40vh; }
}

/* ==================== ADMIN MODE ==================== */
/* Admin bar — bottom floating toolbar */
.admin-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 1500;
  display: none;
  align-items: center;
  gap: 12px;
  padding: 10px var(--space-lg);
  background: rgba(26,26,26,0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.admin-bar.visible { display: flex; }

.admin-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 2px;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  margin-right: var(--space-sm);
}

.admin-btn {
  background: none;
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.8);
  padding: 5px 14px;
  font-size: var(--text-base-sm);
  font-family: inherit;
  cursor: pointer;
  border-radius: 3px;
  transition: background 0.2s, color 0.2s;
}
.admin-btn:hover { background: rgba(255,255,255,0.12); color: #fff; }
.admin-exit { border-color: transparent; color: rgba(255,255,255,0.5); margin-left: auto; }
.admin-exit:hover { color: #ff6b6b; }

/* Portfolio item admin controls */
.portfolio-item { position: relative; }
.item-admin-ctrls {
  position: absolute;
  top: 6px; right: 6px;
  display: none;
  gap: 4px;
  z-index: 10;
}
.admin-active .item-admin-ctrls { display: flex; }

.item-admin-btn {
  width: 28px; height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.65);
  color: #fff;
  border: none;
  font-size: 13px;
  cursor: pointer;
  border-radius: 3px;
  transition: background 0.15s;
}
.item-admin-btn:hover { background: rgba(0,0,0,0.85); }
.item-admin-hide { font-size: 15px; }
.item-admin-hide.hidden-state { opacity: 0.4; }
.item-admin-up,
.item-admin-down {
  font-size: 16px;
  font-weight: 700;
  background: rgba(0,0,0,0.55);
}
.item-admin-up:hover,
.item-admin-down:hover { background: rgba(0,0,0,0.85); }

/* Hidden item indicator */
.portfolio-item.item-hidden { opacity: 0.35; }
.portfolio-item.item-hidden:hover { opacity: 0.6; }

/* Admin form overlay */
.admin-form-overlay {
  position: fixed;
  inset: 0;
  z-index: 2500;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(20,20,18,0.85);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.admin-form-overlay.open { display: flex; }

.admin-form-panel {
  background: var(--ground);
  padding: 40px var(--space-lg);
  width: min(90vw, 580px);
  max-height: 85vh;
  overflow-y: auto;
}

.admin-form-title {
  font-size: var(--text-base-sm);
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--ink-secondary);
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.admin-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}
.af-full { grid-column: 1 / -1; }

.admin-form-grid label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--ink-secondary);
  letter-spacing: 1px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.admin-form-grid input,
.admin-form-grid select {
  font-size: var(--text-base-sm);
  font-family: inherit;
  padding: 8px 10px;
  border: 1px solid var(--hairline-dark);
  background: var(--white);
  border-radius: 2px;
  color: var(--ink);
}
.admin-form-grid input:focus,
.admin-form-grid select:focus {
  outline: none;
  border-color: var(--brand);
}

/* Image manager */
.af-images-area > span {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--ink-secondary);
  letter-spacing: 1px;
  margin-bottom: 8px;
  display: block;
}

.af-image-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
  max-height: 200px;
  overflow-y: auto;
}

.af-image-item {
  position: relative;
  width: 80px;
  height: 60px;
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--hairline-dark);
  background: var(--hairline);
}
.af-image-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.af-image-item .af-img-name {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.65);
  color: #fff;
  font-size: 9px;
  padding: 1px 4px;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.af-image-del {
  position: absolute;
  top: 2px; right: 2px;
  width: 18px; height: 18px;
  background: rgba(220,50,50,0.85);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 11px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: background 0.15s;
}
.af-image-del:hover { background: rgba(200,30,30,0.95); }

.af-image-add-placeholder {
  width: 80px;
  height: 60px;
  border: 1px dashed var(--hairline-dark);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-secondary);
  font-size: 24px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.af-image-add-placeholder:hover { border-color: var(--brand); color: var(--brand); }

.af-image-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.admin-form-actions {
  display: flex;
  gap: 10px;
  margin-top: var(--space-md);
  justify-content: flex-end;
}
.admin-btn-save {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
}
.admin-btn-save:hover { background: var(--ink); opacity: 0.85; }

@media (max-width: 768px) {
  .admin-bar { padding: 8px var(--space-sm); gap: 8px; overflow-x: auto; }
  .admin-btn { padding: 4px 10px; font-size: var(--text-sm); white-space: nowrap; }
  .admin-label { display: none; }
  .admin-form-panel { padding: 28px var(--space-sm); }
}

/* ==================== SCROLL REVEAL ==================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1s ease, transform 1s ease;
}

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

/* ==================== HOVER STATES (desktop only) ==================== */
@media (hover: hover) {
  .nav-links a:hover,
  .nav-links a.active { color: var(--ink); }

  .filter-btn:hover { color: var(--ink); }

  .business-card:hover .biz-img img { transform: scale(1.03); }

  .portfolio-item:hover img { opacity: 0.85; }

  .model-card:hover .model-preview img { transform: scale(1.03); }

  .model-card:hover .model-overlay { opacity: 1; }

  .contact-item a:hover { color: var(--brand); }
}

/* ==================== REDUCED MOTION ==================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .biz-img img,
  .model-preview img,
  .portfolio-item img {
    transition: none;
  }

  .model-overlay {
    transition: none;
  }
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; padding-right: var(--space-lg); overflow: hidden; }
  .hero-image { margin-left: 0; }
  .hero-image img { transform: scale(0.95); }
  .hero-title { white-space: normal; }
  .portfolio-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
}

@media (max-width: 768px) {
  :root {
    --space-xl: 80px;
    --space-xxl: 120px;
  }

  .container { padding: 0 var(--space-md); }
  section { padding: var(--space-xl) 0; }

  /* Navbar */
  .nav-container { padding: 0 var(--space-sm); }
  .nav-toggle { display: flex; }

  /* Mobile menu: panel slides down from navbar */
  .nav-links {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    z-index: 1050;
    background: var(--ground);
    list-style: none;
    padding: var(--space-sm) var(--space-md);
    transform: translateY(-120%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 16px 32px rgba(0,0,0,0.06);
  }
  .nav-links { pointer-events: none; }
  .nav-links.open { transform: translateY(0); pointer-events: auto; }
  .nav-links li {
    border-bottom: 1px solid var(--hairline);
  }
  .nav-links li:last-child { border-bottom: none; }
  .nav-links a {
    display: block;
    font-size: 15px;
    padding: 14px 0;
    text-decoration: none;
  }
  /* Menu backdrop */
  .nav-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.25);
    z-index: 1040;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
  }
  .nav-backdrop.open {
    opacity: 1;
    pointer-events: auto;
  }

  .logo-icon { height: 32px; width: 32px; }
  .logo-text { font-size: 13px; }

  /* Hero */
  .hero {
    padding: calc(var(--nav-height) + var(--space-lg)) var(--space-md) var(--space-md);
    overflow: hidden;
    gap: var(--space-md);
  }
  .hero-text { padding-right: 0; }
  .hero-image { margin-left: 0; padding-top: 0; }
  .hero-image img { transform: scale(1); max-height: 60vh; object-fit: contain; }
  .hero-title { white-space: normal; font-size: 28px; margin-bottom: var(--space-xs); }
  .hero-desc { font-size: var(--text-base); }
  .hero-title-en { font-size: 13px; letter-spacing: 6px; }

  /* Sections */
  .about { padding: var(--space-xl) 0; }
  .business { padding: var(--space-xl) 0; }
  .portfolio { padding: var(--space-xl) 0; }
  .models { padding: var(--space-xl) 0; }
  .tech { padding: var(--space-xl) 0; }
  .contact { padding: var(--space-xl) 0; }

  /* Grids */
  .services-grid { grid-template-columns: 1fr; row-gap: var(--space-md); }
  .business-grid { grid-template-columns: 1fr; gap: var(--space-md); }
  .portfolio-grid { grid-template-columns: 1fr; gap: var(--space-md); row-gap: var(--space-md); }
  .models-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: var(--space-md); }
  .about-grid { gap: var(--space-md); }

  /* Misc */
  .about-stats { gap: var(--space-md); }
  .portfolio-filter { gap: var(--space-sm); margin-bottom: var(--space-md); }
  .footer-bottom { flex-direction: column; gap: 4px; }
  .section-sub-label { margin: var(--space-md) 0 var(--space-sm); padding-top: var(--space-xl); }
  .section-note { margin-top: -12px; margin-bottom: var(--space-md); }
}