/* 零界面设计系统 - 两曜百货店企业官网 */
:root {
  --visible-ui: minimal;
  --bg: #FAFAFA;
  --bg-alt: #F0F0F0;
  --bg-warm: #F5F1E8;
  --ink: #1C1C1E;
  --ink-soft: #4B5563;
  --line: #E4E4E7;
  --ok-bg: #DCFCE7;
  --ok-ink: #14532D;
  --err-bg: #FEE2E2;
  --err-ink: #991B1B;
  --accent: #1C1C1E;
  --accent-hover: #000000;
  --radius: 12px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部导航栏 */
.header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: var(--ink);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.nav-link {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--ink);
}

.nav-cta {
  background: var(--ink);
  color: var(--bg);
  padding: 12px 24px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* Hero 区域 */
.hero {
  padding: 120px 0 80px;
  text-align: center;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  color: var(--ink);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

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

.btn-primary {
  background: var(--ink);
  color: var(--bg);
  padding: 16px 32px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: var(--transition);
  border: 2px solid var(--ink);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  padding: 16px 32px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  border: 2px solid var(--line);
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: var(--ink);
  background: var(--bg-alt);
}

/* 风格信息条 */
.chips {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 40px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.chip {
  background: var(--bg-alt);
  color: var(--ink);
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
}

/* 特性卡片区 */
.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 48px;
  text-align: center;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--ink);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-alt);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  color: var(--ink-soft);
  line-height: 1.6;
}

/* 按钮展示区 */
.buttons-showcase {
  background: var(--bg-alt);
  padding: 60px 0;
}

.buttons-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  align-items: center;
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  padding: 12px 24px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 500;
  border: none;
  transition: var(--transition);
}

.btn-ghost:hover {
  background: var(--bg);
}

.toggle {
  position: relative;
  width: 56px;
  height: 32px;
  background: var(--line);
  border-radius: 16px;
  cursor: pointer;
  transition: var(--transition);
}

.toggle.active {
  background: var(--ink);
}

.toggle-slider {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  background: var(--bg);
  border-radius: 50%;
  transition: var(--transition);
}

.toggle.active .toggle-slider {
  left: 28px;
}

.badge {
  background: var(--ok-bg);
  color: var(--ok-ink);
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* 表单区 */
.form-section {
  padding: 80px 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.form-input {
  padding: 12px 16px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  font-size: 16px;
  font-family: inherit;
  transition: var(--transition);
  background: var(--bg);
}

.form-input:focus {
  outline: none;
  border-color: var(--ink);
}

.form-textarea {
  grid-column: 1 / -1;
  min-height: 120px;
  resize: vertical;
}

.form-submit {
  grid-column: 1 / -1;
  justify-self: center;
}

/* 页脚 */
.footer {
  background: var(--ink);
  color: var(--bg);
  padding: 60px 0 30px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  color: var(--bg-alt);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--bg);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
  color: var(--bg-alt);
}

/* 响应式 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero {
    padding: 80px 0 60px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
}

/* 无障碍 */
:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}