/* ========================================
   Bella的艺术小店 — 全局样式
   侘寂 / 东方禅意 / 宋式极简
   ======================================== */

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

:root {
  --bg: #FAF9F6;
  --text: #2C2C2C;
  --text-secondary: #8C8C8C;
  --accent: #7B8FA1;
  --accent-warm: #C4A882;
  --border: #E8E4DD;
  --dark-bg: #1A1A1A;
  --white: #FFFFFF;

  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', 'STSong', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --spacing-2xl: 10rem;

  --max-width: 960px;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.8;
  min-height: 100vh;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.4;
  color: var(--text);
}

h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 249, 246, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

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

.nav-brand {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text);
  transition: width 0.3s ease;
}

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

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text);
  margin: 5px 0;
  transition: 0.3s;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--border);
  }

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

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

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

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

.section-dark h2,
.section-dark h3 {
  color: var(--white);
}

.section-dark p {
  color: rgba(255,255,255,0.65);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 60px;
  position: relative;
}

.hero-content {
  max-width: 640px;
  padding: var(--spacing-md);
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.08em;
}

.hero .subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 2;
}

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

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  letter-spacing: 0.05em;
}

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

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

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

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

.btn-light {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.3);
}

.btn-light:hover {
  border-color: var(--white);
  color: var(--white);
}

/* --- Module Cards (Home) --- */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.module-card {
  padding: var(--spacing-lg) var(--spacing-md);
  border-left: 1px solid var(--border);
  transition: border-color 0.4s ease;
}

.module-card:hover {
  border-left-color: var(--accent);
}

.module-card .module-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  opacity: 0.7;
}

.module-card h3 {
  margin-bottom: var(--spacing-xs);
}

.module-card p {
  margin-bottom: var(--spacing-sm);
}

.module-card .module-link {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}

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

/* --- Page Header --- */
.page-header {
  padding: 120px 0 var(--spacing-lg);
  text-align: center;
}

.page-header h1 {
  margin-bottom: var(--spacing-sm);
}

.page-header .page-subtitle {
  font-size: 1rem;
  max-width: 480px;
  margin: 0 auto;
}

/* --- About Page --- */
.about-story {
  max-width: 660px;
  margin: 0 auto;
}

.about-story p {
  font-size: 1rem;
  line-height: 2.2;
  margin-bottom: var(--spacing-md);
}

.about-story .highlight {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--text);
  line-height: 1.8;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: var(--spacing-lg) 0;
}

.about-story .motto {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--text);
  text-align: center;
  padding: var(--spacing-lg) 0;
  line-height: 1.8;
}

.about-traits {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  padding: var(--spacing-lg) 0;
}

.trait {
  text-align: center;
}

.trait .trait-word {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--accent);
  display: block;
  margin-bottom: 4px;
}

.trait .trait-line {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* --- Products Page --- */
.product-category {
  margin-bottom: var(--spacing-xl);
}

.product-category h2 {
  margin-bottom: var(--spacing-xs);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border);
}

.product-category .category-desc {
  margin-bottom: var(--spacing-lg);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.product-card {
  background: var(--white);
  border: 1px solid var(--border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.06);
}

.product-image {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.product-info h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.product-meta {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-sm);
}

.product-tag {
  font-size: 0.75rem;
  color: var(--accent);
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 2px;
}

.product-info .product-price {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--text);
  margin-bottom: var(--spacing-xs);
}

.product-info .product-quote {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 0;
}

.product-status {
  display: inline-block;
  font-size: 0.7rem;
  padding: 2px 10px;
  border: 1px solid var(--accent);
  color: var(--accent);
  margin-bottom: var(--spacing-sm);
}

/* --- Mood Painting Page --- */
.mood-hero {
  text-align: center;
  padding: var(--spacing-xl) 0;
}

.mood-hero h2 {
  font-size: 1.8rem;
  margin-bottom: var(--spacing-sm);
}

.mood-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0;
}

.mood-step {
  text-align: center;
  padding: var(--spacing-md);
}

.mood-step .step-num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: var(--accent);
  opacity: 0.5;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.mood-step h4 {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.mood-step p {
  font-size: 0.8rem;
}

.mood-examples {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.mood-example {
  text-align: center;
}

.mood-example-image {
  width: 100%;
  aspect-ratio: 3/4;
  background: var(--border);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.mood-example .example-story {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
}

.mood-example .example-title {
  font-family: var(--font-serif);
  color: var(--text);
  font-size: 0.95rem;
  margin-top: 4px;
}

@media (max-width: 768px) {
  .mood-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .mood-examples {
    grid-template-columns: 1fr;
  }
}

/* --- Signature Page --- */
.signature-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0;
}

.signature-item {
  aspect-ratio: 3/2;
  background: var(--white);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* --- Contact Page --- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text);
  margin-bottom: 6px;
  font-family: var(--font-serif);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--text);
  transition: border-color 0.3s ease;
  outline: none;
  border-radius: 0;
  -webkit-appearance: none;
}

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

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-submit {
  width: 100%;
  padding: 14px;
  font-size: 0.95rem;
  cursor: pointer;
}

.contact-info-side {
  padding-top: var(--spacing-lg);
}

.contact-info-side h3 {
  margin-bottom: var(--spacing-sm);
}

.contact-info-side .contact-detail {
  margin-bottom: var(--spacing-md);
}

.contact-info-side .contact-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 2px;
}

.contact-info-side .contact-value {
  color: var(--text);
}

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

/* --- Dark Section CTA --- */
.cta-section {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.cta-section h2 {
  margin-bottom: var(--spacing-sm);
}

.cta-section p {
  margin-bottom: var(--spacing-lg);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

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

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0.6;
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* --- Placeholder image --- */
.img-placeholder {
  background: linear-gradient(135deg, var(--border) 0%, #DCD7CF 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

/* --- Pricing Note --- */
.pricing-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
  text-align: center;
}

/* --- Divider --- */
.divider {
  width: 40px;
  height: 1px;
  background: var(--border);
  margin: var(--spacing-lg) auto;
}

/* --- Responsive section padding --- */
@media (max-width: 640px) {
  .section {
    padding: var(--spacing-lg) 0;
  }

  .hero {
    min-height: 90vh;
  }

  .page-header {
    padding: 100px 0 var(--spacing-md);
  }

  .about-traits {
    flex-direction: column;
    gap: var(--spacing-md);
  }
}