/* ============================================
   正窑陶瓷艺术工作室 — Apple 风格全局样式
   Zhengyao Ceramic Art Studio — Apple-style Global Styles
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Typography */
  --font-sans: "Inter", "Noto Sans SC", "Noto Sans CJK SC", "SF Pro Display", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", serif;

  /* Brand Colors — 正窑陶瓷艺术工作室 */
  --ivory:       #F5F0E6;   /* 米白色 主色 */
  --orange:      #D4773A;   /* 橙色 副色 */
  --orange-dark: #C06A30;   /* 橙色 hover */
  --brown:       #2C1810;   /* 深棕 主文字 */
  --brown-light: #8B6B5A;   /* 浅棕 次要文字 */
  --brown-border:#E8DFD5;   /* 棕边 边框 */
  --brown-section:#F7F3ED;  /* 浅棕 区块背景 */

  /* Colors — Light Mode (Ivory + Orange + Brown) */
  --color-bg: var(--ivory);
  --color-text: var(--brown);
  --color-text-secondary: var(--brown-light);
  --color-accent: var(--orange);
  --color-accent-hover: var(--orange-dark);
  --color-border: var(--brown-border);
  --color-section-bg: var(--brown-section);
  --color-card-bg: #ffffff;

  /* Spacing */
  --section-padding: 80px 0;
  --content-max-width: 1200px;
  --content-padding: 0 24px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.4s ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1A120B;
    --color-text: #FFFFF0;
    --color-text-secondary: #B8A090;
    --color-accent: #E07A39;
    --color-accent-hover: #F08A47;
    --color-border: #3D2E22;
    --color-section-bg: #231A12;
    --color-card-bg: #231A12;
  }
}

/* --- 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;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 17px;
  overflow-x: hidden;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* --- Typography Hierarchy (Apple-style) --- */
h1 {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h2 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

h3 {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 600;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: clamp(19px, 2.5vw, 24px);
  font-weight: 400;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

.section-headline {
  text-align: center;
  margin-bottom: 60px;
}

.section-headline p {
  font-size: 19px;
  color: var(--color-text-secondary);
  margin-top: 12px;
}

/* --- Layout --- */
.content-wrapper {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--content-padding);
}

section {
  padding: var(--section-padding);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(245, 240, 230, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(44, 24, 16, 0.06);
  transition: background var(--transition-fast);
}

@media (prefers-color-scheme: dark) {
  .nav {
    background: rgba(26, 18, 11, 0.85);
    border-bottom-color: rgba(255, 255, 240, 0.08);
  }
}

.nav-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  text-decoration: none;
}

.nav-logo img {
  height: 36px;
  width: 36px;
  border-radius: 8px;
  object-fit: contain;
}

.nav-logo span {
  color: var(--color-text-secondary);
  font-weight: 400;
  margin-left: 8px;
  font-size: 14px;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--color-text);
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.nav-links a:hover {
  opacity: 1;
  color: var(--color-text);
}

.nav-lang-toggle {
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 980px;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.nav-lang-toggle:hover {
  background: var(--color-text);
  color: var(--color-bg);
}

/* Mobile Nav */
.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-mobile-toggle {
    display: block;
  }
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-block;
  font-size: 13px;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 980px;
  padding: 6px 16px;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero h1 {
  margin-bottom: 20px;
}

.hero .hero-subtitle {
  margin-bottom: 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.section-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 32px;
}

/* Buttons */
.btn {
  display: inline-block;
  font-size: 17px;
  padding: 12px 28px;
  border-radius: 980px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background: var(--color-accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #ffffff;
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
  background: var(--color-accent);
  color: #ffffff;
}

/* --- Product Grid --- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 40px;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.product-card {
  background: var(--color-card-bg);
  border-radius: 20px;
  overflow: hidden;
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
  cursor: pointer;
  border: 1px solid var(--color-border);
}

.product-card:hover {
  transform: scale(1.02);
  box-shadow: 0 20px 60px rgba(44, 24, 16, 0.10);
}

.product-card-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--color-section-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 14px;
  text-align: center;
  padding: 20px;
}

.product-card-body {
  padding: 28px;
}

.product-card-body h3 {
  margin-bottom: 8px;
}

.product-card-body p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.product-card-tags {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.tag {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 980px;
  background: var(--color-section-bg);
  color: var(--color-text-secondary);
}

/* --- Placeholder Image --- */
.placeholder-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, var(--brown-section) 0%, #E8DFD5 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 15px;
  text-align: center;
  padding: 20px;
  border-radius: 12px;
  margin: 40px 0;
}

/* --- Process Section --- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.process-step {
  text-align: center;
}

.process-step-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-accent);
  opacity: 0.3;
  margin-bottom: 12px;
}

.process-step h3 {
  margin-bottom: 8px;
}

.process-step p {
  font-size: 15px;
  color: var(--color-text-secondary);
}

/* --- Footer --- */
.footer {
  background: var(--color-section-bg);
  padding: 60px 24px 40px;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
}

.footer h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.footer a {
  display: block;
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 10px;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.footer a:hover {
  opacity: 1;
}

.footer-bottom {
  max-width: var(--content-max-width);
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-secondary);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* --- Scroll Animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* --- Bilingual Hiding --- */
.zh, .en {
  transition: opacity var(--transition-fast);
}

body.lang-en .zh {
  display: none !important;
}

body.lang-zh .en {
  display: none !important;
}

/* Default: show Chinese, hide English */
.en {
  display: none;
}

body.lang-en .en {
  display: inline !important;
}

body.lang-en .zh-inline {
  display: none !important;
}

.zh-inline {
  display: inline !important;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --section-padding: 60px 0;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
  }

  .hero {
    padding: 100px 20px 60px;
  }

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

/* --- Product Detail Page --- */
.product-hero {
  padding: 140px 24px 80px;
  text-align: center;
}

.product-hero h1 {
  margin-bottom: 16px;
}

.product-hero .product-slogan {
  font-size: 22px;
  color: var(--color-text-secondary);
  font-style: italic;
  margin-bottom: 40px;
}

.product-detail-image {
  max-width: 900px;
  margin: 0 auto 60px;
  aspect-ratio: 4 / 3;
  background: var(--brown-section);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 15px;
  text-align: center;
  padding: 40px;
}

.product-detail-section {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.product-detail-section h2 {
  margin-bottom: 20px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
}

.product-detail-section p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 16px;
}

.product-specs-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.product-specs-table th,
.product-specs-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
}

.product-specs-table th {
  color: var(--color-text-secondary);
  font-weight: 500;
  width: 40%;
}

/* --- Spec Grid (Apple-style cards) --- */
.spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 20px 0;
}

.spec-grid .spec-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 16px 18px;
}

.spec-grid .spec-card .spec-label {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  font-weight: 500;
}

.spec-grid .spec-card .spec-value {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.3;
}

.spec-grid .spec-card .spec-value.zh,
.spec-grid .spec-card .spec-value.en {
  font-size: 15px;
}

/* Feature list (after spec grid) */
.feature-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  font-size: 17px;
  line-height: 2;
  color: var(--color-text);
  padding: 0;
}

.feature-list li::before {
  content: "•";
  color: var(--color-accent);
  font-weight: 700;
  margin-right: 10px;
}

/* Shared Specs Grid (compact) */
.spec-grid.shared {
  grid-template-columns: 1fr 1fr 1fr 1fr;
}

.spec-grid.shared .spec-card {
  padding: 14px 14px;
  text-align: center;
}

.spec-grid.shared .spec-card .spec-label {
  font-size: 13px;
  margin-bottom: 6px;
}

.spec-grid.shared .spec-card .spec-value {
  font-size: 15px;
  font-weight: 500;
}

@media (max-width: 768px) {
  .spec-grid {
    grid-template-columns: 1fr;
  }
  .spec-grid.shared {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .spec-grid.shared {
    grid-template-columns: 1fr;
  }
}

/* --- Feature Cards --- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 20px 0;
}

.feature-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 18px 16px;
  text-align: center;
}

.feature-card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  margin: 0;
  font-weight: 500;
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* --- About Page --- */
.about-hero {
  padding: 140px 24px 80px;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-body {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 24px 80px;
  font-size: 19px;
  line-height: 1.9;
  color: var(--color-text);
}

.about-body p {
  margin-bottom: 24px;
}

.about-body h2 {
  margin-top: 48px;
  margin-bottom: 20px;
}

/* --- Contact Page --- */
.contact-hero {
  padding: 140px 24px 60px;
  text-align: center;
}

.contact-form {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 24px 100px;
}

.contact-form label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: 17px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  margin-bottom: 20px;
  transition: border-color var(--transition-fast);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

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