/* ========================================
   糖心Vlog - 主样式文件
   现代极简高端风格
   ======================================== */

:root {
  --primary: #c9a96e;
  --primary-light: #e8d5b0;
  --primary-dark: #a07840;
  --text-dark: #1a1a1a;
  --text-mid: #555555;
  --text-light: #999999;
  --bg-white: #ffffff;
  --bg-light: #fafaf8;
  --bg-section: #f5f3ef;
  --border: #e8e4de;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.14);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-cn: 'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-cn);
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- TYPOGRAPHY ---- */
h1,h2,h3,h4,h5,h6 { font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.1rem; }

.section-title {
  text-align: center;
  margin-bottom: 0.75rem;
  color: var(--text-dark);
}
.section-subtitle {
  text-align: center;
  color: var(--text-mid);
  font-size: 1.05rem;
  margin-bottom: 3.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 1rem;
}

/* ---- LAYOUT ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-alt { background: var(--bg-section); }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: var(--font-cn);
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201,169,110,0.4);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}
.btn-white {
  background: #fff;
  color: var(--primary-dark);
}
.btn-white:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
}

/* ---- HEADER / NAV ---- */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
#site-header.scrolled {
  box-shadow: var(--shadow);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-dark);
}
.nav-logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: cover;
}
.nav-logo span { color: var(--primary); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-mid);
  position: relative;
  padding-bottom: 2px;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--primary);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { width: 100%; }
.nav-cta { margin-left: 1rem; }
.nav-mobile-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-mobile-btn span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-dark);
  margin: 5px 0;
  transition: var(--transition);
}

/* ---- SEARCH BAR ---- */
.search-bar-wrap {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 600px;
  margin: 0 auto;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  padding: 6px 16px;
  gap: 10px;
  transition: var(--transition);
}
.search-bar-inner:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(201,169,110,0.15);
}
.search-bar-inner input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 0.9rem;
  font-family: var(--font-cn);
  color: var(--text-dark);
  background: transparent;
}
.search-bar-inner input::placeholder { color: var(--text-light); }
.search-bar-inner button {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 6px 18px;
  font-size: 0.85rem;
  font-family: var(--font-cn);
  cursor: pointer;
  transition: var(--transition);
}
.search-bar-inner button:hover { background: var(--primary-dark); }

/* ---- HERO ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 120px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
  transform: scale(1.05);
  transition: transform 8s ease;
}
.hero-bg.loaded { transform: scale(1); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.2) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  max-width: 700px;
}
.hero-tag {
  display: inline-block;
  background: rgba(201,169,110,0.9);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 5px 16px;
  border-radius: 20px;
  margin-bottom: 1.5rem;
}
.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.hero-title em { color: var(--primary-light); font-style: normal; }
.hero-desc {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 2.5rem;
  max-width: 520px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-stats {
  position: absolute;
  bottom: 60px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  gap: 3rem;
  color: #fff;
  text-align: center;
}
.hero-stat-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-light);
  display: block;
}
.hero-stat-label {
  font-size: 0.8rem;
  opacity: 0.8;
  letter-spacing: 0.05em;
}

/* ---- VIDEO CARDS ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}
.video-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: var(--transition);
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.35); }
.play-icon {
  width: 56px; height: 56px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.7);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-card:hover .play-icon {
  opacity: 1;
  transform: scale(1);
}
.play-icon svg { width: 22px; height: 22px; fill: var(--primary); margin-left: 3px; }
.video-badge {
  position: absolute;
  top: 12px; left: 12px;
  background: var(--primary);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
}
.video-duration {
  position: absolute;
  bottom: 10px; right: 10px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 18px 20px 20px; }
.video-category {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.video-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 10px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 14px;
  font-size: 0.78rem;
  color: var(--text-light);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ---- FEATURES ---- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.feature-card {
  padding: 40px 32px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}
.feature-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.feature-icon {
  width: 64px; height: 64px;
  background: var(--primary-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 1.8rem;
}
.feature-card h3 { margin-bottom: 0.75rem; font-size: 1.15rem; }
.feature-card p { color: var(--text-mid); font-size: 0.92rem; line-height: 1.7; }

/* ---- STATS ---- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat-item {
  background: #fff;
  padding: 48px 32px;
  text-align: center;
}
.stat-num {
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--primary);
  display: block;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.9rem;
  color: var(--text-mid);
}

/* ---- REVIEWS ---- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.review-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}
.review-stars {
  color: var(--primary);
  font-size: 1rem;
  margin-bottom: 1rem;
  letter-spacing: 2px;
}
.review-text {
  font-size: 0.92rem;
  color: var(--text-mid);
  line-height: 1.75;
  margin-bottom: 1.25rem;
  font-style: italic;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-dark);
  flex-shrink: 0;
}
.review-name { font-weight: 600; font-size: 0.9rem; }
.review-role { font-size: 0.78rem; color: var(--text-light); }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-cn);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  text-align: left;
  gap: 16px;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  color: var(--text-mid);
  font-size: 1.2rem;
  line-height: 1;
}
.faq-item.active .faq-icon {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}
.faq-answer-inner {
  padding: 0 0 22px;
  color: var(--text-mid);
  font-size: 0.94rem;
  line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; }

/* ---- CONTACT ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 60px;
  align-items: start;
}
.contact-info h3 { margin-bottom: 1rem; }
.contact-info p { color: var(--text-mid); margin-bottom: 2rem; line-height: 1.8; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 1.2rem;
  font-size: 0.92rem;
  color: var(--text-mid);
}
.contact-icon {
  width: 40px; height: 40px;
  background: var(--primary-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--text-dark); }
.form-group input,
.form-group textarea,
.form-group select {
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-family: var(--font-cn);
  color: var(--text-dark);
  background: #fff;
  transition: var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(201,169,110,0.15);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ---- FOOTER ---- */
#site-footer {
  background: var(--text-dark);
  color: rgba(255,255,255,0.7);
  padding: 70px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .nav-logo { color: #fff; margin-bottom: 1rem; }
.footer-brand p { font-size: 0.88rem; line-height: 1.8; max-width: 260px; }
.footer-col h4 {
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.2rem;
  letter-spacing: 0.05em;
}
.footer-col ul li { margin-bottom: 0.6rem; }
.footer-col ul li a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--primary-light); }
.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 1.5rem;
}
.social-btn {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  transition: var(--transition);
  cursor: pointer;
}
.social-btn:hover { background: var(--primary); color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--primary-light); }

/* ---- ABOUT SECTION ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}
.about-img img { width: 100%; height: 420px; object-fit: cover; }
.about-text .section-tag { margin-bottom: 1rem; }
.about-text h2 { margin-bottom: 1.25rem; }
.about-text p { color: var(--text-mid); margin-bottom: 1rem; line-height: 1.85; }
.about-list { margin: 1.5rem 0 2rem; }
.about-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 0.75rem;
  font-size: 0.92rem;
  color: var(--text-mid);
}
.about-list li::before {
  content: '✓';
  width: 22px; height: 22px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* ---- PAGE HERO (inner pages) ---- */
.page-hero {
  background: linear-gradient(135deg, var(--text-dark) 0%, #2d2d2d 100%);
  color: #fff;
  padding: 160px 0 80px;
  text-align: center;
}
.page-hero h1 { margin-bottom: 1rem; }
.page-hero p { color: rgba(255,255,255,0.75); max-width: 500px; margin: 0 auto; }
.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  margin-top: 1.5rem;
}
.breadcrumb a { color: rgba(255,255,255,0.6); }
.breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb span { color: var(--primary-light); }

/* ---- MOBILE NAV ---- */
.mobile-menu {
  display: none;
  position: fixed;
  top: 70px; left: 0; right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 20px 24px;
  z-index: 999;
  box-shadow: var(--shadow);
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-mid);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-search {
  margin-top: 16px;
  display: flex;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  overflow: hidden;
}
.mobile-search input {
  flex: 1;
  padding: 10px 16px;
  border: none;
  outline: none;
  font-family: var(--font-cn);
  font-size: 0.9rem;
}
.mobile-search button {
  padding: 10px 18px;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  font-family: var(--font-cn);
}

/* ---- ANIMATIONS ---- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp 0.7s ease forwards; }
.fade-up-delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-up-delay-2 { animation-delay: 0.2s; opacity: 0; }
.fade-up-delay-3 { animation-delay: 0.3s; opacity: 0; }
.fade-up-delay-4 { animation-delay: 0.4s; opacity: 0; }

/* ---- RESPONSIVE ---- */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .about-grid { gap: 48px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  .section { padding: 70px 0; }
  .nav-links, .nav-cta { display: none; }
  .nav-mobile-btn { display: block; }
  .features-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-stats { gap: 1.5rem; bottom: 30px; }
  .hero-stat-num { font-size: 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}

/* ---- MODAL VIDEO ---- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.88);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: 90%;
  max-width: 800px;
  position: relative;
}
.video-modal-close {
  position: absolute;
  top: 12px; right: 16px;
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 36px; height: 36px;
  cursor: pointer;
  font-size: 1.2rem;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.video-modal-close:hover { background: rgba(255,255,255,0.3); }
.video-modal-body {
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  background: #111;
}

/* ---- BACK TO TOP ---- */
#back-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 44px; height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(201,169,110,0.4);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 500;
  font-size: 1.1rem;
}
#back-top.visible { opacity: 1; transform: translateY(0); }
#back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }