/* ============================================
   贝勒爷官网 — 设计系统 v2.0
   暗黑奢华 + 科技感
   参考：Aesop / Apple / Balmain / SSENSE
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* 主色系 */
  --color-bg: #0a0a0a;
  --color-bg-elevated: #111111;
  --color-bg-card: #161616;
  --color-bg-hover: #1e1e1e;
  --color-border: #2a2a2a;
  --color-border-light: #333333;

  /* 金色系 */
  --color-gold: #002FA7;
  --color-gold-light: #1a4fd4;
  --color-gold-dark: #001f7a;
  --color-gold-dim: #001a5e;

  /* 文字色 */
  --color-text-primary: #e8e4dd;
  --color-text-secondary: #9a9590;
  --color-text-tertiary: #6b6560;
  --color-text-disabled: #4a4540;

  /* 功能色 */
  --color-white: #ffffff;
  --color-error: #d94a4a;
  --color-success: #4a9d5e;

  /* 字体 */
  --font-display: 'Cormorant Garamond', 'Noto Serif SC', 'STSong', serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

  /* 字号层级 — 仅三档：标题 / 正文 / 标注 */
  --text-display-xl: clamp(3.5rem, 8vw, 7rem);
  --text-display-lg: clamp(2.5rem, 5vw, 4.5rem);
  --text-display-md: clamp(1.75rem, 3vw, 2.75rem);
  --text-heading: clamp(1.25rem, 2vw, 1.75rem);
  --text-body-lg: 1.125rem;
  --text-body: 1rem;
  --text-body-sm: 0.875rem;
  --text-caption: 0.75rem;
  --text-label: 0.6875rem;

  /* 间距 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;
  --space-section: clamp(4rem, 10vw, 8rem);

  /* 动画 */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.76, 0, 0.24, 1);
  --duration-fast: 0.3s;
  --duration-normal: 0.6s;
  --duration-slow: 1s;
  --duration-glacial: 1.5s;

  /* 其他 */
  --max-width: 1400px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
}

/* --- 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;
  text-rendering: optimizeLegibility;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.7;
  overflow-x: hidden;
  cursor: none;
}

/* 选中文字 */
::selection {
  background: rgba(200, 164, 92, 0.3);
  color: var(--color-gold-light);
}

::-moz-selection {
  background: rgba(200, 164, 92, 0.3);
  color: var(--color-gold-light);
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gold-dim);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: 0.02em;
}

.display-xl {
  font-family: var(--font-display);
  font-size: var(--text-display-xl);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: 0.01em;
}

.display-lg {
  font-family: var(--font-display);
  font-size: var(--text-display-lg);
  font-weight: 300;
  line-height: 1.1;
}

.display-md {
  font-family: var(--font-display);
  font-size: var(--text-display-md);
  font-weight: 400;
  line-height: 1.2;
}

.heading {
  font-family: var(--font-display);
  font-size: var(--text-heading);
  font-weight: 500;
}

.body-lg {
  font-size: var(--text-body-lg);
  line-height: 1.8;
}

.body-sm {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.caption {
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-tertiary);
}

.label {
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-gold);
}

/* --- Custom Cursor --- */
.custom-cursor {
  position: fixed;
  top: 0;
  left: 0;
  width: 24px;
  height: 24px;
  border: 1.5px solid var(--color-gold);
  border-radius: 50%;
  pointer-events: none;
  z-index: 99999;
  transition: width var(--duration-fast) var(--ease-out-expo),
              height var(--duration-fast) var(--ease-out-expo),
              border-color var(--duration-fast) var(--ease-out-expo),
              background var(--duration-fast) var(--ease-out-expo);
  mix-blend-mode: difference;
}

.custom-cursor.hover {
  width: 56px;
  height: 56px;
  background: rgba(200, 164, 92, 0.1);
  border-color: var(--color-gold-light);
}

.custom-cursor.click {
  width: 16px;
  height: 16px;
  background: var(--color-gold);
  border-color: var(--color-gold);
}

.custom-cursor-dot {
  position: fixed;
  top: 0;
  left: 0;
  width: 4px;
  height: 4px;
  background: var(--color-gold);
  border-radius: 50%;
  pointer-events: none;
  z-index: 99999;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--duration-normal) var(--ease-out-expo),
              padding var(--duration-normal) var(--ease-out-expo);
}

.nav.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 1rem 2rem;
  border-bottom: 1px solid rgba(42, 42, 42, 0.5);
}

.nav-logo {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'SimHei', sans-serif;
  font-weight: 900;
  font-size: 1.35rem;
  color: var(--color-gold);
  text-decoration: none;
  letter-spacing: 0.08em;
  transition: color var(--duration-fast);
}

.nav-logo:hover {
  color: var(--color-gold-light);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-body-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--duration-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--duration-fast) var(--ease-out-expo);
}

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

.nav-links a:hover::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--color-gold);
}

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

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text-primary);
  transition: transform var(--duration-fast) var(--ease-out-expo),
              opacity var(--duration-fast);
}

/* --- Page Transition Overlay --- */
.page-transition {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-bg);
  transform: scaleY(0);
  transform-origin: top;
  pointer-events: none;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-family: var(--font-body);
  font-size: var(--text-body-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: none;
  transition: all var(--duration-fast) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--color-gold);
  color: var(--color-bg);
  border-color: var(--color-gold);
}

.btn-primary:hover {
  background: var(--color-gold-light);
  border-color: var(--color-gold-light);
}

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

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  border-color: transparent;
}

.btn-ghost:hover {
  color: var(--color-gold);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--text-caption);
}

.btn-lg {
  padding: 1.125rem 2.5rem;
  font-size: var(--text-body);
}

/* --- Section --- */
.section {
  padding: var(--space-section) 2rem;
}

.section-dark {
  background: var(--color-bg-elevated);
}

.section-label {
  display: inline-block;
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  margin-bottom: var(--space-lg);
}

.section-divider {
  width: 60px;
  height: 1px;
  background: var(--color-gold);
  margin: var(--space-xl) 0;
}

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
}

/* --- Card --- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--duration-fast),
              background var(--duration-fast);
}

.card:hover {
  border-color: var(--color-border-light);
  background: var(--color-bg-hover);
}

/* --- Grid --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2xl);
}

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

/* --- Image --- */
.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-contain {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* --- Reveal Animation (GSAP controlled) --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
}

/* --- Loading Screen --- */
.loader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.loader-logo {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'SimHei', sans-serif;
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 4rem);
  color: var(--color-gold);
  letter-spacing: 0.12em;
  opacity: 0;
}

.loader-line {
  width: 0;
  height: 1px;
  background: var(--color-gold);
  margin-top: var(--space-lg);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  filter: brightness(0.6) saturate(0.5);
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 40%, var(--color-bg) 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

.hero-subtitle {
  display: block;
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  margin-bottom: var(--space-lg);
}

.hero-title {
  margin-bottom: var(--space-xl);
}

.hero-desc {
  max-width: 480px;
  color: var(--color-text-secondary);
  font-size: var(--text-body-lg);
  margin-bottom: var(--space-2xl);
}

/* --- Parallax Section --- */
.parallax-section {
  position: relative;
  overflow: hidden;
}

.parallax-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.parallax-content {
  position: relative;
  z-index: 1;
}

/* --- Sticky Reveal --- */
.sticky-reveal {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  align-items: center;
  gap: var(--space-3xl);
}

.sticky-reveal-text {
  padding: var(--space-4xl) 0;
}

.sticky-reveal-visual {
  position: sticky;
  top: 50%;
  transform: translateY(-50%);
  height: 60vh;
}

.sticky-reveal-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.7);
}

/* --- Product Card --- */
.product-card {
  position: relative;
  overflow: hidden;
  cursor: none;
}

.product-card-image {
  aspect-ratio: 3/4;
  overflow: hidden;
  background: var(--color-bg-card);
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.product-card:hover .product-card-image img {
  transform: scale(1.05);
}

.product-card-info {
  padding: var(--space-lg) 0;
}

.product-card-name {
  font-family: var(--font-display);
  font-size: var(--text-heading);
  margin-bottom: var(--space-xs);
}

.product-card-desc {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

/* --- 3D Canvas Container --- */
.three-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.three-container canvas {
  display: block;
}

/* --- Baidu Map --- */
.map-container {
  width: 100%;
  height: 500px;
  border: 1px solid var(--color-border);
}

.map-info {
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  margin-top: var(--space-lg);
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4xl) 2rem var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-brand {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'SimHei', sans-serif;
  font-weight: 900;
  font-size: 1.5rem;
  color: var(--color-gold);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.footer-desc {
  color: var(--color-text-tertiary);
  font-size: var(--text-body-sm);
  margin-bottom: var(--space-xl);
}

.footer-title {
  font-family: var(--font-display);
  font-size: var(--text-body);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-links a {
  color: var(--color-text-tertiary);
  text-decoration: none;
  font-size: var(--text-body-sm);
  transition: color var(--duration-fast);
}

.footer-links a:hover {
  color: var(--color-gold);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: var(--space-3xl) auto 0;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-caption);
  color: var(--color-text-disabled);
}

/* --- Form --- */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-body);
  transition: border-color var(--duration-fast);
  outline: none;
}

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

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

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-disabled);
}

/* --- Testimonial --- */
.testimonial {
  padding: var(--space-2xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
}

.testimonial-quote {
  font-family: var(--font-display);
  font-size: var(--text-display-md);
  line-height: 1.3;
  margin-bottom: var(--space-xl);
}

.testimonial-author {
  color: var(--color-gold);
  font-size: var(--text-body-sm);
}

/* --- Stat --- */
.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-display-lg);
  color: var(--color-gold);
  line-height: 1;
}

.stat-label {
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-top: var(--space-sm);
}

/* --- Accordion --- */
.accordion-item {
  border-bottom: 1px solid var(--color-border);
}

.accordion-header {
  padding: var(--space-lg) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: none;
  font-family: var(--font-display);
  font-size: var(--text-heading);
}

.accordion-header:hover {
  color: var(--color-gold);
}

.accordion-icon {
  font-size: 1.5rem;
  transition: transform var(--duration-fast) var(--ease-out-expo);
  color: var(--color-gold);
}

.accordion-item.open .accordion-icon {
  transform: rotate(45deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-normal) var(--ease-out-expo);
}

.accordion-content-inner {
  padding-bottom: var(--space-xl);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* --- Mobile Nav --- */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(10, 10, 10, 0.98);
  backdrop-filter: blur(30px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out-expo);
}

.mobile-nav.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-links {
  list-style: none;
  text-align: center;
}

.mobile-nav-links li {
  margin-bottom: var(--space-xl);
}

.mobile-nav-links a {
  font-family: var(--font-display);
  font-size: var(--text-display-md);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--duration-fast);
}

.mobile-nav-links a:hover {
  color: var(--color-gold);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .grid-2,
  .sticky-reveal {
    grid-template-columns: 1fr;
  }

  .sticky-reveal-visual {
    position: relative;
    top: auto;
    transform: none;
    height: 50vh;
  }

  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }

  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }

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

  .hero-content {
    padding: 0 1.5rem;
  }

  .section {
    padding: var(--space-3xl) 1.5rem;
  }

  .map-container {
    height: 350px;
  }
}

@media (max-width: 640px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: var(--text-body-sm);
  }

  .nav {
    padding: 1rem 1.25rem;
  }

  .nav.scrolled {
    padding: 0.75rem 1.25rem;
  }

  .hero-content {
    padding: 0 1rem;
  }
}

/* --- Utility --- */
.text-gold { color: var(--color-gold); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-0 { margin-bottom: 0; }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: none;
}