/* ===================================
   小灶 AI - 官网首页样式
   =================================== */

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  display: flex;
  align-items: center;
  background: rgba(15, 14, 23, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 2px 12px rgba(255, 107, 53, 0.4);
  position: relative;
  overflow: hidden;
}

.nav-logo-icon::after {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,0.4), transparent 60%);
}

.nav-logo-text {
  letter-spacing: -0.5px;
}

.nav-logo-text span {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  color: var(--color-text-muted);
  transition: color var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-warm);
  transition: width var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  font-size: 24px;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
}

/* Hero 区域 */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.12) 0%, transparent 60%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 210, 63, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.2);
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 24px;
  animation: fadeInUp 0.6s forwards;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  animation: pulse 2s infinite;
}

.hero-mascot {
  margin: 0 auto 32px;
  animation: fadeInUp 0.8s 0.2s backwards;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -2px;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s 0.3s backwards;
}

.hero h1 .text-gradient {
  display: inline-block;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 36px;
  line-height: 1.7;
  animation: fadeInUp 0.8s 0.4s backwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s 0.5s backwards;
}

.hero-actions .btn {
  padding: 14px 36px;
  font-size: 16px;
}

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 13px;
  animation: fadeIn 1s 1s backwards;
}

.scroll-hint .arrow {
  width: 20px;
  height: 32px;
  border: 2px solid var(--color-text-muted);
  border-radius: 12px;
  position: relative;
}

.scroll-hint .arrow::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--color-text-muted);
  border-radius: 2px;
  animation: scrollArrow 1.5s infinite;
}

@keyframes scrollArrow {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 18px; }
}

/* 区块通用 */
.section {
  padding: 100px 0;
  position: relative;
}

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

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 107, 53, 0.1);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* 功能卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-warm);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.feature-card:hover {
  background: var(--color-card-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(255, 107, 53, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* 步骤区 */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  counter-reset: step;
}

.step-card {
  text-align: center;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  color: #fff;
  margin: 0 auto 20px;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.3);
  counter-increment: step;
}

.step-number::before {
  content: counter(step);
}

.step-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.step-card p {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.7;
}

/* 统计区 */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  text-align: center;
}

.stat-item .stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-warm);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.stat-item .stat-label {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* CTA 区 */
.cta-section {
  text-align: center;
  padding: 80px 40px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(255, 107, 53, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
}

.cta-section p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 32px;
  position: relative;
}

.cta-section .btn {
  position: relative;
}

/* 页脚 */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
  background: var(--color-bg-2);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand .nav-logo {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: var(--color-text-muted);
  font-size: 14px;
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--color-text-muted);
}

.footer-bottom .social {
  display: flex;
  gap: 16px;
}

.footer-bottom .social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all var(--transition);
}

.footer-bottom .social a:hover {
  background: rgba(255, 107, 53, 0.15);
  color: var(--color-primary);
}

/* 响应式 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-toggle {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  .section {
    padding: 60px 0;
  }
}