/* 杏仁记忆官网 - 与 App 配色一致 */
:root {
  --primary: #29C29E;
  --primary-dark: #25AE8D;
  --deep-green: #1D8F73;
  --light-green: #86EFAC;
  --bg-light: #F5F7F4;
  --card-white: #ffffff;
  --text-main: #1E293B;
  --text-secondary: #64748B;
  --text-tertiary: #94A3B8;
  --ring-inactive: #E2E8F0;
  --shadow: 0 4px 20px rgba(30, 41, 59, 0.08);
  --radius: 12px;
  --font-sans: "Noto Sans SC", -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg-light);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 var(--ring-inactive);
  z-index: 100;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--deep-green);
  text-decoration: none;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s, color 0.2s;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
}

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

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

.btn-lg {
  padding: 12px 24px;
  font-size: 1rem;
}

/* Main */
.main-content {
  flex: 1;
  padding-top: 56px;
}

/* Hero & Carousel */
.hero {
  min-height: 420px;
  position: relative;
  overflow: hidden;
}

.carousel {
  position: relative;
  width: 100%;
  height: 420px;
  overflow: hidden;
}

.carousel-track {
  display: flex;
  width: 400%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.carousel-item {
  flex: 0 0 25%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 2rem;
}

.carousel-item::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
}

.carousel-item-1::before {
  background: linear-gradient(135deg, var(--bg-light) 0%, var(--light-green) 50%, var(--primary) 100%);
  opacity: 0.95;
}

.carousel-item-2::before {
  background: linear-gradient(135deg, #e0f2fe 0%, #7dd3fc 50%, var(--primary) 100%);
  opacity: 0.95;
}

.carousel-item-3::before {
  background: linear-gradient(135deg, #fef3c7 0%, #fcd34d 40%, var(--primary-dark) 100%);
  opacity: 0.95;
}

.carousel-item-4::before {
  background: linear-gradient(135deg, #fce7f3 0%, #f9a8d4 40%, var(--deep-green) 100%);
  opacity: 0.95;
}

.carousel-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 560px;
}

.carousel-content h2 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 0.75rem;
  text-shadow: 0 1px 2px rgba(255,255,255,0.8);
}

.carousel-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0;
  text-shadow: 0 1px 1px rgba(255,255,255,0.6);
}

.carousel-dots {
  position: absolute;
  bottom: 20px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 10px;
  z-index: 2;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--text-main);
  background: transparent;
  cursor: pointer;
  padding: 0;
  transition: background 0.25s, transform 0.25s;
}

.carousel-dot:hover {
  background: var(--text-tertiary);
}

.carousel-dot.active {
  background: var(--primary);
  border-color: var(--primary);
  transform: scale(1.2);
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.9);
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow);
}

.carousel-btn:hover {
  background: #fff;
  box-shadow: 0 6px 24px rgba(30,41,59,0.15);
}

.carousel-prev { left: 20px; }
.carousel-next { right: 20px; }

/* Features */
.features {
  padding: 64px 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  margin: 0 0 40px;
  color: var(--text-main);
}

.feature-grid,
.vip-plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  justify-content: center;
}

.vip-features {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.vip-features li {
  padding: 4px 0;
  padding-left: 1em;
  position: relative;
}
.vip-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 600;
}
}

.feature-card {
  background: var(--card-white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(30, 41, 59, 0.12);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--text-main);
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

/* CTA */
.cta {
  text-align: center;
  padding: 48px 24px;
  background: linear-gradient(180deg, transparent 0%, rgba(41, 194, 158, 0.08) 100%);
}

.cta p {
  margin: 0 0 20px;
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Footer */
.site-footer {
  padding: 24px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.875rem;
  border-top: 1px solid var(--ring-inactive);
}

/* Form pages */
.page-form {
  max-width: 420px;
  margin: 80px auto 60px;
  padding: 0 24px;
}

.page-form h1 {
  font-size: 1.5rem;
  margin: 0 0 24px;
  text-align: center;
  color: var(--text-main);
}

.form-card {
  background: var(--card-white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--ring-inactive);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(41, 194, 158, 0.2);
}

.form-error {
  font-size: 0.8125rem;
  color: #EF4444;
  margin-top: 6px;
}

.captcha-row {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.captcha-row input {
  flex: 1;
}

.captcha-img-wrap {
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--ring-inactive);
  cursor: pointer;
}

.captcha-img-wrap img {
  display: block;
  height: 42px;
  width: auto;
}

.form-actions {
  margin-top: 24px;
}

.form-actions .btn {
  width: 100%;
  padding: 12px;
}

.form-footer {
  text-align: center;
  margin-top: 20px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.form-footer a {
  color: var(--primary);
  text-decoration: none;
}

.form-footer a:hover {
  text-decoration: underline;
}

/* Profile */
.profile-page {
  max-width: 640px;
  margin: 80px auto 60px;
  padding: 0 24px;
}

.profile-page h1 {
  font-size: 1.5rem;
  margin: 0 0 24px;
  color: var(--text-main);
}

.profile-card {
  background: var(--card-white);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.profile-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--ring-inactive);
}

.profile-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 4px;
}

.profile-meta {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

.progress-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.progress-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--ring-inactive);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-list li:last-child {
  border-bottom: none;
}

.progress-list .book-title {
  font-weight: 500;
  color: var(--text-main);
}

.progress-list .book-meta {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.progress-list .book-chapter {
  font-size: 0.875rem;
  color: var(--primary-dark);
}

.loading, .error-msg {
  text-align: center;
  padding: 24px;
  color: var(--text-secondary);
}

.error-msg {
  color: #EF4444;
}

.profile-actions {
  margin-top: 16px;
}

.profile-actions .btn {
  margin-right: 8px;
}

.modal-overlay {
  display: flex;
}

.form-actions .btn + .btn {
  margin-left: 8px;
}

/* ========== 移动端适配 ========== */
@media (max-width: 768px) {
  .site-header {
    padding: 0 16px;
    height: 52px;
  }

  .logo {
    font-size: 1.125rem;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .nav-links {
    gap: 8px;
  }

  .nav-links .btn {
    min-height: 44px;
    padding: 10px 14px;
    font-size: 0.8125rem;
  }

  .main-content {
    padding-top: 52px;
  }

  .hero,
  .carousel {
    min-height: 320px;
    height: 320px;
  }

  .carousel-content h2 {
    font-size: 1.25rem;
  }

  .carousel-content p {
    font-size: 0.875rem;
  }

  .carousel-btn {
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
    left: 12px;
  }

  .carousel-next {
    right: 12px;
  }

  .carousel-dots {
    bottom: 12px;
    gap: 8px;
  }

  .carousel-dot {
    width: 44px;
    height: 44px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
  }

  .carousel-dot::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid var(--text-main);
    background: transparent;
  }

  .carousel-dot.active::before {
    background: var(--primary);
    border-color: var(--primary);
  }

  .features {
    padding: 40px 16px;
  }

  .section-title {
    font-size: 1.375rem;
    margin-bottom: 24px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feature-card {
    padding: 20px;
  }

  .feature-card:hover {
    transform: none;
  }

  .cta {
    padding: 32px 16px;
  }

  .cta .btn-lg {
    min-height: 48px;
    padding: 14px 24px;
  }

  .page-form {
    margin: 60px auto 40px;
    padding: 0 16px;
  }

  .form-card {
    padding: 24px 20px;
  }

  .form-group input,
  .form-group select {
    min-height: 48px;
    padding: 12px 14px;
    font-size: 16px; /* 避免 iOS 自动放大 */
  }

  .form-actions .btn {
    min-height: 48px;
    padding: 14px;
  }

  .captcha-img-wrap {
    min-height: 48px;
  }

  .captcha-img-wrap img {
    height: 48px;
  }

  .profile-page {
    margin: 60px auto 40px;
    padding: 0 16px;
  }

  .profile-card {
    padding: 20px;
  }

  .profile-header {
    flex-wrap: wrap;
  }

  .profile-avatar {
    width: 64px;
    height: 64px;
  }

  .profile-name {
    font-size: 1.125rem;
  }

  .profile-actions .btn {
    min-height: 44px;
  }

  .progress-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 14px 0;
  }

  .progress-list .book-chapter {
    margin-left: 0;
  }

  .site-footer {
    padding: 16px;
    font-size: 0.8125rem;
  }
}

@media (max-width: 480px) {
  .hero,
  .carousel {
    min-height: 280px;
    height: 280px;
  }

  .carousel-content h2 {
    font-size: 1.125rem;
  }

  .carousel-prev {
    left: 8px;
  }

  .carousel-next {
    right: 8px;
  }
}