/**
 * Holos AI - UI Components & Interactive Modules
 * Theme: Warm Sun (暖阳)
 */

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(28, 23, 18, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 0;
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
}
.brand-logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.nav-link:hover {
  color: var(--accent-primary-light);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary-light), var(--accent-sunset));
  color: #FFFFFF;
  font-weight: 700;
  box-shadow: 0 4px 18px var(--accent-primary-glow);
}
.btn-primary:hover {
  opacity: 0.96;
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(255, 143, 92, 0.45);
}
.btn-secondary {
  background: var(--bg-glass-card);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}
.btn-secondary:hover {
  background: rgba(255, 248, 239, 0.08);
  border-color: var(--border-card);
  color: var(--accent-primary-light);
}
.btn-large {
  padding: 14px 30px;
  font-size: 1.05rem;
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 143, 92, 0.12);
  border: 1px solid var(--border-glow);
  color: var(--accent-primary-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #FFFFFF 0%, #F3E9DC 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-title .gradient-text {
  background: linear-gradient(135deg, #FFAE8F 0%, #FF8F5C 50%, #F5B95E 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 36px;
  font-weight: 400;
}
.hero-cta-group {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Translation Ecosystem Section */
.trans-eco-section {
  padding: 60px 0 80px;
}
.trans-eco-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 30px;
}
.trans-eco-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
}
.polish-demo-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 16px;
  margin-top: 20px;
}
.grammar-step-item {
  background: rgba(255, 255, 255, 0.03);
  border-left: 3px solid var(--accent-primary);
  padding: 10px 14px;
  border-radius: 0 10px 10px 0;
  margin-bottom: 10px;
  font-size: 0.88rem;
}

/* Feature & Moat Grid */
.features-section {
  padding: 60px 0;
}
.section-header {
  text-align: center;
  margin-bottom: 50px;
}
.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.8px;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto;
}
.moat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.moat-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition-fast);
}
.moat-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.moat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255, 143, 92, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  border: 1px solid var(--border-glow);
}
.moat-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.moat-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Download Section */
.download-section {
  padding: 80px 0;
  text-align: center;
}
.download-channels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}
.download-card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}
.download-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(18, 10, 5, 0.4);
}
.channel-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  flex-shrink: 0;
  color: var(--accent-primary);
}
.channel-info {
  flex: 1;
  text-align: left;
}
.channel-info h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}
.channel-info p {
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.btn-download-arrow {
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast), color var(--transition-fast);
}
.download-card:hover .btn-download-arrow {
  transform: translateX(4px);
  color: var(--accent-primary-light);
}

/* Footer (Clean Horizontal Desktop Layout + Responsive Wrap) */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 60px 0 40px;
  margin-top: 80px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 60px;
  flex-wrap: wrap;
}
.footer-brand {
  max-width: 380px;
}
.footer-brand .brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  text-decoration: none;
}
.footer-brand .brand-logo img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 14px;
  line-height: 1.6;
}
.footer-brand .copyright {
  margin-top: 20px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-nav {
  display: flex;
  gap: 64px;
  flex-wrap: wrap;
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-col h5 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}
.footer-col a:hover {
  color: var(--accent-primary-light);
}

/* AI Context Polish (3 Tones Extension) */
.polish-result-container {
  display: none;
  flex-direction: column;
  gap: 12px;
  margin-top: 18px;
}
.polish-tone-card {
  background: rgba(255, 143, 92, 0.07);
  border: 1px solid rgba(255, 143, 92, 0.22);
  border-radius: 12px;
  padding: 12px 16px;
  transition: all 0.2s ease;
}
.polish-tone-card:hover {
  background: rgba(255, 143, 92, 0.12);
  border-color: var(--accent-primary);
}
.polish-tone-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.polish-tone-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-primary-light);
  display: flex;
  align-items: center;
  gap: 6px;
}
.polish-copy-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.polish-copy-btn:hover {
  color: #fff;
  background: rgba(255, 143, 92, 0.25);
  border-color: var(--accent-primary);
}
.polish-tone-en {
  font-size: 0.92rem;
  color: #ffffff;
  font-weight: 500;
  line-height: 1.4;
}
.polish-tone-zh {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
  line-height: 1.35;
}