/* ============================================================
   FOCUSDESIGN 福柯思照明设计 — 全局样式表
   参考: focuslighting.com 建筑事务所风格
   设计语言: 浅色基底 / 大面积留白 / 光影对比 / 克制的暖色点缀
   ============================================================ */

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

:root,
html[data-theme="light"] {
  /* 主色系 */
  --bg-dark:      #ffffff;
  --bg-card:      #ffffff;
  --bg-surface:   #f5f5f5;
  --bg-elevated:  #fafafa;
  --border:       rgba(0,0,0,0.08);
  --border-light: rgba(0,0,0,0.12);

  /* 文字 */
  --text-primary:   #1a1a1a;
  --text-secondary: rgba(0,0,0,0.72);
  --text-muted:     rgba(0,0,0,0.45);
  --text-disabled:  rgba(0,0,0,0.35);
  --text-on-accent: #1a1a1a;

  /* 点缀色 — 暖金（光源色） */
  --accent:        #d4a853;
  --accent-light:  #e8c97a;
  --accent-dark:   #b8913a;

  /* 排版 */
  --font-cn: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "微软雅黑", sans-serif;
  --font-en: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-display: "Playfair Display", "Georgia", serif;

  /* 间距 */
  --section-gap: 120px;
  --content-max: 1280px;
  --nav-height:  72px;

  /* 过渡 */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-in-out: cubic-bezier(0.645, 0.045, 0.355, 1);
  --duration: 0.4s;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-cn);
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.68;
  overflow-x: hidden;
}

/* 英文环境字体 */
h1, h2, h3, h4, .en, .logo-text {
  font-family: var(--font-en);
}

/* ---------- Typography ---------- */
h1 { font-size: clamp(2.8rem, 5vw, 4.8rem); font-weight: 300; letter-spacing: -0.02em; line-height: 1.15; }
h2 { font-size: clamp(2rem, 3.5vw, 3rem);     font-weight: 300; letter-spacing: -0.01em; line-height: 1.25; }
h3 { font-size: 1.25rem; font-weight: 500; letter-spacing: 0.02em; }
h4 { font-size: 0.875rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }

p  { color: var(--text-secondary); margin-bottom: 1rem; }

a  { color: var(--text-primary); text-decoration: none; transition: color var(--duration) var(--ease-out); }
a:hover { color: var(--accent); }

/* ---------- Container ---------- */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 40px;
}

.section {
  padding: var(--section-gap) 0;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  transition: background var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo img {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
}

.nav-logo .brand {
  font-family: var(--font-en);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.nav-logo .brand span {
  font-weight: 300;
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 36px;
  align-items: center;
}

.nav-links a {
  font-size: 0.825rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s var(--ease-out);
}

.nav-links a:hover,
.nav-links a.active { color: var(--text-primary); }

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--text-primary);
  transition: all 0.3s var(--ease-out);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  background: var(--bg-dark);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(212,168,83,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 30% 60%, rgba(255,255,255,0.03) 0%, transparent 70%),
    var(--bg-dark);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 0 20px;
}

.hero-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
  padding: 6px 18px;
  border: 1px solid rgba(212,168,83,0.3);
  border-radius: 2px;
}

.hero-title {
  font-family: var(--font-en);
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 200;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 28px;
  color: var(--text-primary);
}

.hero-title em {
  font-style: normal;
  color: var(--accent);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 300;
  margin-bottom: 48px;
  line-height: 1.6;
}

.hero-cta {
  display: inline-flex;
  gap: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  transition: all 0.35s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent);
  color: var(--text-on-accent);
}

.btn-primary:hover {
  background: var(--accent-light);
  color: var(--text-on-accent);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Hero scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.hero-scroll span {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ---------- Section Header ---------- */
.section-header {
  text-align: center;
  margin-bottom: 72px;
}

.section-header h4 {
  margin-bottom: 12px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  max-width: 560px;
  margin: 0 auto;
  font-size: 1rem;
  color: var(--text-muted);
}

/* ---------- About Teaser ---------- */
.about-teaser {
  padding-bottom: 80px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text h2 {
  margin-bottom: 20px;
}

.about-text .lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-weight: 300;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.stat-value {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 300;
  color: var(--accent);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 4px;
}

.about-visual {
  position: relative;
  aspect-ratio: 4/5;
  background: var(--bg-surface);
  border-radius: 4px;
  overflow: hidden;
}

.about-visual .placeholder-img {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-card));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-disabled);
}

.about-visual .glow {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212,168,83,0.12), transparent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

/* ---------- Projects Grid ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
}

.project-card {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-surface);
}

.project-card.large {
  grid-column: span 2;
  aspect-ratio: 16/7;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s var(--ease-in-out);
}

.project-card:hover .project-img {
  transform: scale(1.04);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0,0,0,0.85) 0%,
    rgba(0,0,0,0.2) 40%,
    transparent 100%
  );
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 32px;
  opacity: 0;
  transition: opacity 0.4s var(--ease-out);
}

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

.project-overlay .cat {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.project-overlay .title {
  font-size: 1.3rem;
  font-weight: 400;
  color: #fff;
}

.project-overlay .location {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Placeholder image */
.placeholder-img {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  color: var(--text-disabled);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
}

.service-card {
  background: var(--bg-card);
  padding: 48px 32px;
  transition: background 0.4s var(--ease-out);
}

.service-card:hover {
  background: var(--bg-elevated);
}

.service-card .icon {
  width: 48px;
  height: 48px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(212,168,83,0.1);
  color: var(--accent);
  font-size: 1.2rem;
}

.service-card h3 {
  margin-bottom: 12px;
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.service-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---------- Featured Project ---------- */
.featured-project {
  position: relative;
  width: 100%;
  height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-surface);
}

.featured-img {
  position: absolute;
  inset: 0;
  background: var(--bg-elevated);
  opacity: 0.5;
}

.featured-content {
  position: relative;
  z-index: 2;
  max-width: 520px;
  padding: 0 80px;
}

.featured-content .cat {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.featured-content h2 {
  margin-bottom: 16px;
}

.featured-content p {
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* ---------- Clients / Footer ---------- */
.clients-bar {
  padding: 60px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.clients-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
}

.clients-list span {
  font-size: 0.9rem;
  color: var(--text-disabled);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-card);
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand img {
  height: 32px;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 280px;
}

.footer-col h4 {
  margin-bottom: 20px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--text-disabled);
  margin: 0;
}

.footer-social {
  display: flex;
  gap: 20px;
}

.footer-social a {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- Page Banner (内页) ---------- */
.page-banner {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--bg-card);
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 50%, rgba(212,168,83,0.04), transparent),
    var(--bg-card);
}

.page-banner .content {
  position: relative;
  z-index: 2;
}

.page-banner h1 {
  font-size: clamp(2.4rem, 4vw, 3.6rem);
  margin-bottom: 12px;
}

.page-banner p {
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 300;
}

/* ---------- Project Filter ---------- */
.project-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 20px;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s var(--ease-out);
  border-radius: 2px;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--text-on-accent);
}

/* ---------- Project Detail ---------- */
.project-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  margin-top: 48px;
}

.project-detail-grid img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  background: var(--bg-surface);
}

.project-info {
  padding: 60px 0;
}

.project-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

.project-info-grid dt {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
}

.project-info-grid dd {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* ---------- Services Page ---------- */
.service-detail {
  padding: 80px 0;
  border-bottom: 1px solid var(--border);
}

.service-detail:last-child {
  border-bottom: none;
}

.service-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.service-detail-grid.reverse {
  direction: rtl;
}

.service-detail-grid.reverse .service-detail-text {
  direction: ltr;
}

.service-detail-text h3 {
  font-size: 1.6rem;
  margin-bottom: 16px;
  font-weight: 300;
}

.service-detail-text .num {
  font-family: var(--font-en);
  font-size: 3rem;
  font-weight: 200;
  color: var(--accent);
  opacity: 0.3;
  display: block;
  margin-bottom: 12px;
}

.service-detail-visual {
  aspect-ratio: 4/3;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
}

/* ---------- About Page ---------- */
.about-intro {
  padding: 80px 0;
}

.about-intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-intro-text h2 {
  margin-bottom: 20px;
}

.about-intro-text .lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.7;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.team-card {
  text-align: center;
}

.team-card .avatar {
  width: 100%;
  aspect-ratio: 1;
  background: var(--bg-surface);
  border-radius: 4px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-disabled);
}

.team-card .name {
  font-weight: 500;
  margin-bottom: 2px;
}

.team-card .role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 48px;
}

.value-card h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.value-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------- Contact Page ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h2 {
  margin-bottom: 16px;
}

.contact-info .desc {
  color: var(--text-muted);
  margin-bottom: 40px;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
  align-items: flex-start;
}

.contact-item .icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(212,168,83,0.1);
  border-radius: 50%;
  flex-shrink: 0;
  color: var(--accent);
}

.contact-item h4 {
  font-size: 0.75rem;
  margin-bottom: 2px;
}

.contact-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

.contact-form {
  background: var(--bg-card);
  padding: 48px;
  border-radius: 4px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-cn);
  font-size: 0.9rem;
  border-radius: 2px;
  transition: border-color 0.3s;
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* ---------- Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out),
              transform 0.8s var(--ease-out);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .about-intro-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  :root { --section-gap: 80px; --nav-height: 60px; }

  .container { padding: 0 24px; }
  .navbar { padding: 0 24px; }

  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-card);
    flex-direction: column;
    padding: 100px 32px 40px;
    gap: 24px;
    transition: right 0.4s var(--ease-out);
  }

  .nav-links.open { right: 0; }

  .nav-toggle { display: flex; z-index: 1001; }

  .projects-grid { grid-template-columns: 1fr; }
  .project-card.large { grid-column: span 1; aspect-ratio: 4/3; }
  .services-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .project-detail-grid { grid-template-columns: 1fr; }
  .service-detail-grid { grid-template-columns: 1fr; gap: 32px; }
  .service-detail-grid.reverse { direction: ltr; }
  .values-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }

  .featured-project { height: 400px; }
  .featured-content { padding: 0 24px; }

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

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .clients-list { gap: 24px; }
  .team-grid { grid-template-columns: 1fr; }
  .project-info-grid { grid-template-columns: 1fr; gap: 20px; }
}

/* ============ AI 服务平台导航项（企业官网 + AI 网关一体化入口） ============ */
.nav-links a.nav-portal {
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 16px;
  border-radius: 2px;
  letter-spacing: 0.08em;
  transition: all 0.3s var(--ease-out);
}
.nav-links a.nav-portal::after { display: none; }
.nav-links a.nav-portal:hover { background: var(--accent); color: var(--text-on-accent); }

@media (max-width: 768px) {
  .nav-links a.nav-portal {
    align-self: flex-start;
    padding: 8px 20px;
  }
}

/* ========== 深色主题（账户中心可切换） ========== */
html[data-theme="dark"] {
  --bg-dark:      #0d0d0d;
  --bg-card:      #141414;
  --bg-surface:   #1a1a1a;
  --bg-elevated:  #222222;
  --border:       rgba(255,255,255,0.08);
  --border-light: rgba(255,255,255,0.15);
  --text-primary:   #ffffff;
  --text-secondary: rgba(255,255,255,0.72);
  --text-muted:     rgba(255,255,255,0.45);
  --text-disabled:  rgba(255,255,255,0.22);
  --text-on-accent: #1a1a1a;
}

html[data-theme="dark"] .navbar.scrolled {
  background: rgba(13, 13, 13, 0.92);
}