/* ============================================
   Lumina · 禅意水晶手链精品店
   极简 · 侘寂 · 东方美学
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;600;700&family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400&family=Noto+Sans+SC:wght@300;400;500&display=swap');

/* ---- CSS Variables ---- */
:root {
  /* 禅意色板 */
  --bg-cream: #F5F0EB;
  --bg-white: #FAFAF8;
  --bg-dark: #1A1815;
  --text-dark: #2D2A24;
  --text-muted: #8A857F;
  --text-light: #B8B2AA;
  --accent-bronze: #8B7355;
  --accent-gold: #C9A96E;
  --accent-gold-light: #E0C99A;
  --border-light: #E5DED6;
  --border-med: #D4CBC0;
  --shadow-soft: 0 2px 20px rgba(0,0,0,0.04);
  --shadow-med: 0 4px 30px rgba(0,0,0,0.08);
  --shadow-warm: 0 8px 40px rgba(139,115,85,0.12);

  /* 字体 */
  --font-display: 'Noto Serif SC', 'Georgia', serif;
  --font-body: 'EB Garamond', 'Georgia', serif;
  --font-sans: 'Noto Sans SC', 'Helvetica Neue', sans-serif;

  /* 间距 */
  --space-xs: 0.375rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3.5rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

  /* 容器 */
  --container: 1200px;
  --container-narrow: 800px;

  /* 过渡 */
  --ease-zen: cubic-bezier(0.25, 0.01, 0.25, 1);
  --duration-slow: 0.6s;
  --duration-med: 0.35s;
  --duration-fast: 0.2s;
}

/* ---- Reset ---- */
*, *::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-body);
  background-color: var(--bg-cream);
  color: var(--text-dark);
  line-height: 1.7;
  font-size: 18px;
  font-weight: 400;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-zen);
}
a:hover { opacity: 0.7; }

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
  transition: all var(--duration-med) var(--ease-zen);
}

input, textarea, select {
  font-family: var(--font-sans);
  font-size: 15px;
  border: 1px solid var(--border-light);
  background: var(--bg-white);
  padding: 0.75rem 1rem;
  border-radius: 0;
  transition: border-color var(--duration-fast) var(--ease-zen);
  outline: none;
  width: 100%;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--accent-bronze);
}

/* ---- 文字噪点纹理 ---- */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  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='0.65' numOctaves='3' 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: 256px 256px;
}

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.6rem); }
h4 { font-size: 1.1rem; }

.subtitle {
  font-family: var(--font-display);
  color: var(--text-muted);
  font-weight: 300;
  font-size: clamp(0.95rem, 1.5vw, 1.15rem);
  letter-spacing: 0.15em;
}

.price {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1.2rem;
  color: var(--accent-bronze);
}
.price .original {
  text-decoration: line-through;
  color: var(--text-light);
  font-weight: 300;
  font-size: 0.9rem;
  margin-left: 0.5rem;
}

/* ---- Container ---- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 2.2rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: all var(--duration-med) var(--ease-zen);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--text-dark);
  color: var(--bg-white);
}
.btn-primary:hover {
  background: var(--accent-bronze);
  color: var(--bg-white);
  opacity: 1;
}

.btn-secondary {
  background: transparent;
  border-color: var(--border-med);
  color: var(--text-dark);
}
.btn-secondary:hover {
  border-color: var(--text-dark);
  opacity: 1;
}

.btn-ghost {
  background: transparent;
  color: var(--text-dark);
  padding: 0.5rem 1rem;
}
.btn-ghost:hover { opacity: 0.6; }

.btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: 0.8rem;
}

.btn-gold {
  background: var(--accent-gold);
  color: var(--bg-white);
}
.btn-gold:hover {
  background: var(--accent-bronze);
  opacity: 1;
}

/* ---- 页面过渡 ---- */
.page {
  animation: pageIn var(--duration-slow) var(--ease-zen);
}

@keyframes pageIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Header / Nav ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 1.2rem 0;
  transition: all var(--duration-med) var(--ease-zen);
  background: transparent;
}
.site-header.scrolled {
  background: rgba(245, 240, 235, 0.92);
  backdrop-filter: blur(12px);
  padding: 0.8rem 0;
  box-shadow: 0 1px 0 var(--border-light);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--text-dark);
}
.logo span {
  font-weight: 300;
  color: var(--accent-gold);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}
.nav-links a {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dark);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-dark);
  transition: width var(--duration-med) var(--ease-zen);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.cart-icon {
  position: relative;
  font-size: 1.1rem;
}
.cart-count {
  position: absolute;
  top: -6px;
  right: -8px;
  width: 18px;
  height: 18px;
  background: var(--accent-bronze);
  color: white;
  font-size: 0.65rem;
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  opacity: 0;
  transform: scale(0);
  transition: all var(--duration-med) var(--ease-zen);
}
.cart-count.show {
  opacity: 1;
  transform: scale(1);
}

/* ---- Hero ---- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem var(--space-md) 4rem;
  position: relative;
  background: linear-gradient(180deg, var(--bg-cream) 0%, var(--bg-white) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(201,169,110,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(139,115,85,0.04) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  max-width: 680px;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-bronze);
  border: 1px solid var(--border-light);
  padding: 0.4rem 1.2rem;
  margin-bottom: var(--space-lg);
}

.hero h1 {
  margin-bottom: var(--space-md);
  color: var(--text-dark);
}

.hero p {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- 禅意分隔线 ---- */
.zen-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin: var(--space-xl) 0;
}
.zen-divider::before,
.zen-divider::after {
  content: '';
  width: 40px;
  height: 1px;
  background: var(--border-med);
}
.zen-divider .dot {
  width: 4px;
  height: 4px;
  background: var(--accent-gold);
  border-radius: 50%;
}

/* ---- Section ---- */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}
.section-header h2 {
  margin-bottom: var(--space-sm);
}
.section-header .subtitle {
  max-width: 500px;
  margin: 0 auto;
}

/* ---- 产品网格 ---- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.product-card {
  background: var(--bg-white);
  cursor: pointer;
  transition: all var(--duration-med) var(--ease-zen);
  position: relative;
  overflow: hidden;
}

.product-card:hover {
  box-shadow: var(--shadow-warm);
  transform: translateY(-4px);
}

.product-card-image {
  aspect-ratio: 1;
  overflow: hidden;
  position: relative;
  background: var(--bg-cream);
}
.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-zen);
}
.product-card:hover .product-card-image img {
  transform: scale(1.05);
}

.product-card-info {
  padding: var(--space-md);
}

.product-card-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.product-card-subtitle {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.05em;
}

.product-card-price {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--accent-bronze);
  font-weight: 500;
}

/* ---- 后台管理 ---- */
.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-sidebar {
  width: 250px;
  background: var(--bg-dark);
  color: var(--bg-white);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 50;
}

.admin-sidebar .logo {
  color: var(--bg-white);
  margin-bottom: var(--space-xl);
  font-size: 1.2rem;
}

.admin-sidebar nav a {
  display: block;
  padding: 0.75rem 0;
  color: var(--text-light);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: all var(--duration-fast) var(--ease-zen);
}
.admin-sidebar nav a:hover,
.admin-sidebar nav a.active {
  color: var(--accent-gold);
  opacity: 1;
}

.admin-main {
  margin-left: 250px;
  flex: 1;
  padding: var(--space-xl);
  background: var(--bg-white);
}

/* ---- Toast 通知 ---- */
.toast {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 200;
  padding: 0.8rem 1.5rem;
  background: var(--text-dark);
  color: var(--bg-white);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  transform: translateX(120%);
  transition: transform var(--duration-med) var(--ease-zen);
  max-width: 360px;
}
.toast.show { transform: translateX(0); }
.toast.success { background: var(--accent-bronze); }
.toast.error { background: #9B1D20; }

/* ---- Spinner ---- */
.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-light);
  border-top-color: var(--accent-bronze);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: var(--space-lg) auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- 表单 ---- */
.form-group {
  margin-bottom: var(--space-md);
}
.form-group label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

/* ---- 空状态 ---- */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
}
.empty-state .icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.3;
}

/* ---- Loading / Skeleton ---- */
.skeleton {
  background: linear-gradient(90deg, var(--border-light) 25%, var(--bg-cream) 50%, var(--border-light) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 0;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---- 页脚 ---- */
.site-footer {
  padding: var(--space-2xl) 0;
  text-align: center;
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

/* ---- 模态框 ---- */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(26,24,21,0.4);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-med) var(--ease-zen);
  backdrop-filter: blur(4px);
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}
.modal {
  background: var(--bg-white);
  max-width: 480px;
  width: 90%;
  padding: var(--space-xl);
  position: relative;
  transform: translateY(20px);
  transition: transform var(--duration-med) var(--ease-zen);
}
.modal-overlay.open .modal {
  transform: translateY(0);
}
.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: 1.2rem;
  color: var(--text-muted);
}

/* ---- 响应式 ---- */
@media (max-width: 768px) {
  body { font-size: 16px; }
  .nav-links { gap: var(--space-md); }
  .nav-links a { font-size: 0.75rem; }
  .section { padding: var(--space-xl) 0; }
  .product-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--space-md); }
  .hero { min-height: 90vh; padding-top: 6rem; }
  .hero-cta { flex-direction: column; align-items: center; }
  .admin-sidebar { width: 200px; }
  .admin-main { margin-left: 200px; padding: var(--space-md); }
}

@media (max-width: 480px) {
  .nav-links { gap: var(--space-sm); }
  .product-grid { grid-template-columns: 1fr 1fr; gap: var(--space-sm); }
  .admin-layout { flex-direction: column; }
  .admin-sidebar { width: 100%; height: auto; position: relative; padding: var(--space-md); }
  .admin-main { margin-left: 0; }
}