/* ==========================================================================
   子页面通用样式（指南/关于/FAQ 共用）
   ========================================================================== */

/* page-hero 已在 features.css 中定义，重复一份保持独立 */
.page-hero {
  padding: 80px 0 40px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg-2), var(--color-bg));
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(245, 197, 24, 0.1), transparent 70%);
  pointer-events: none;
}
.page-hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  margin: 16px 0 16px;
  position: relative;
}
.page-hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.page-hero p {
  font-size: 17px;
  color: var(--color-text-2);
  max-width: 680px;
  margin: 0 auto;
  position: relative;
}

/* ==========================================================================
   使用指南页
   ========================================================================== */
.guide-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  padding-top: 60px;
  padding-bottom: 80px;
  align-items: start;
}
.guide-toc {
  position: sticky;
  top: 88px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.guide-toc h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-3);
  margin-bottom: 16px;
  font-weight: 600;
}
.guide-toc ul { display: flex; flex-direction: column; gap: 4px; }
.guide-toc a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-2);
  border-radius: var(--radius-sm);
  transition: all var(--t-fast);
}
.guide-toc a:hover {
  color: var(--color-primary);
  background: rgba(245, 197, 24, 0.06);
}
.guide-content { max-width: 760px; }
.guide-content section {
  margin-bottom: 64px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}
.guide-content section:last-of-type { border-bottom: none; }
.guide-step {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(245, 197, 24, 0.1);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  border-radius: 100px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.guide-content h2 {
  font-size: 32px;
  margin-bottom: 12px;
}
.guide-content h3 {
  font-size: 19px;
  margin: 24px 0 12px;
  color: var(--color-text);
}
.guide-content p {
  font-size: 15px;
  color: var(--color-text-2);
  line-height: 1.75;
  margin-bottom: 12px;
}
.guide-content ul, .guide-content ol {
  margin: 12px 0 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.guide-content ul li, .guide-content ol li {
  font-size: 15px;
  color: var(--color-text-2);
  line-height: 1.7;
}
.guide-content ul li::marker { color: var(--color-primary); }
.guide-content ol li::marker { color: var(--color-primary); font-weight: 700; }
.guide-content code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--color-bg-3);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}
.guide-content pre {
  background: #0a0a0b;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin: 16px 0;
  overflow-x: auto;
  position: relative;
}
.guide-content pre::before {
  content: "CODE";
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 10px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
}
.guide-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e0e0e0;
  font-size: 13px;
  line-height: 1.6;
  white-space: pre;
}
.callout {
  background: rgba(245, 197, 24, 0.06);
  border: 1px solid rgba(245, 197, 24, 0.3);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 16px 0;
}
.callout strong { color: var(--color-primary); display: block; margin-bottom: 4px; }
.callout p { margin: 0; font-size: 14px; }
.callout.success {
  background: rgba(52, 199, 89, 0.06);
  border-color: rgba(52, 199, 89, 0.3);
  border-left-color: var(--color-success);
}
.callout.success strong { color: var(--color-success); }

.threshold-table {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 16px 0;
}
.threshold-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  padding: 12px 20px;
  font-size: 14px;
  border-bottom: 1px solid var(--color-border);
}
.threshold-row:last-child { border-bottom: none; }
.threshold-row > div { text-align: center; }
.threshold-row > div:first-child { text-align: left; color: var(--color-text); font-weight: 500; }
.threshold-head {
  background: var(--color-bg-3);
  font-weight: 600;
  color: var(--color-text-3);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.05em;
}
.threshold-row > div:nth-child(2) { color: var(--color-success); }
.threshold-row > div:nth-child(3) { color: var(--color-warning); }
.threshold-row > div:nth-child(4) { color: var(--color-danger); }
.guide-cta {
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg-3), var(--color-bg));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  margin-top: 40px;
}
.guide-cta h2 { font-size: 26px; margin-bottom: 8px; }
.guide-cta p { color: var(--color-text-3); margin-bottom: 24px; }

/* ==========================================================================
   关于页
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-text h2 {
  font-size: 28px;
  margin-bottom: 16px;
}
.about-text p {
  font-size: 15px;
  color: var(--color-text-2);
  line-height: 1.8;
  margin-bottom: 16px;
}
.about-text a { color: var(--color-primary); }
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}
.about-stat strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}
.about-stat span {
  font-size: 12px;
  color: var(--color-text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.about-card-stack { display: flex; flex-direction: column; gap: 16px; }
.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--t);
}
.about-card:hover {
  border-color: var(--color-primary);
  transform: translateX(-4px);
}
.about-card-icon {
  font-size: 28px;
  margin-bottom: 8px;
}
.about-card h4 { font-size: 17px; margin-bottom: 4px; }
.about-card p { font-size: 14px; color: var(--color-text-3); margin: 0; }

/* 时间线 */
.timeline-section { background: var(--color-bg-2); }
.timeline {
  max-width: 760px;
  margin: 0 auto;
  position: relative;
  padding-left: 60px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary), transparent);
}
.timeline-item {
  position: relative;
  padding-bottom: 40px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-year {
  position: absolute;
  left: -60px;
  top: 0;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #1a1a1a;
  font-size: 12px;
  font-weight: 700;
  border-radius: 50%;
  font-family: var(--font-mono);
  z-index: 1;
  box-shadow: 0 0 0 4px var(--color-bg-2);
}
.timeline-item.current .timeline-year {
  box-shadow: 0 0 0 4px var(--color-bg-2), 0 0 0 6px var(--color-primary);
  animation: glow 2s ease-in-out infinite;
}
@keyframes glow {
  0%, 100% { box-shadow: 0 0 0 4px var(--color-bg-2), 0 0 0 6px var(--color-primary); }
  50% { box-shadow: 0 0 0 4px var(--color-bg-2), 0 0 0 10px rgba(245, 197, 24, 0.4); }
}
.timeline-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
}
.timeline-content h3 { font-size: 18px; margin-bottom: 8px; }
.timeline-content p { font-size: 14px; color: var(--color-text-3); line-height: 1.7; margin: 0; }

/* 团队 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.team-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--t);
}
.team-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
}
.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.team-card h3 { font-size: 18px; margin-bottom: 8px; }
.team-card p { font-size: 14px; color: var(--color-text-3); line-height: 1.7; margin-bottom: 16px; }
.team-social a {
  display: inline-block;
  padding: 6px 14px;
  background: var(--color-bg-3);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 500;
  border-radius: 100px;
  transition: all var(--t-fast);
}
.team-social a:hover { background: var(--color-primary); color: #1a1a1a; }

/* 价值观 */
.values-section { background: var(--color-bg-2); }
.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.value-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all var(--t);
}
.value-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
}
.value-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
  letter-spacing: 0.1em;
}
.value-card h3 { font-size: 18px; margin-bottom: 8px; }
.value-card p { font-size: 13px; color: var(--color-text-3); line-height: 1.7; margin: 0; }

/* 联系 */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 880px;
  margin: 0 auto;
}
.contact-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  color: inherit;
  text-decoration: none;
  transition: all var(--t);
}
.contact-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  color: inherit;
  box-shadow: var(--shadow-yellow);
}
.contact-icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(245, 197, 24, 0.1);
  color: var(--color-primary);
  border-radius: var(--radius);
  margin-bottom: 16px;
}
.contact-icon svg { width: 24px; height: 24px; }
.contact-card h3 { font-size: 19px; margin-bottom: 4px; }
.contact-card p { font-size: 14px; color: var(--color-text-3); margin-bottom: 12px; }
.contact-link {
  display: inline-block;
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 600;
}

/* ==========================================================================
   FAQ 页
   ========================================================================== */
.faq-section { background: var(--color-bg); }
.faq-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 40px;
}
.faq-cat {
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  transition: all var(--t-fast);
}
.faq-cat:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.faq-cat.active {
  background: var(--color-primary);
  color: #1a1a1a;
  border-color: var(--color-primary);
}
.faq-group {
  max-width: 880px;
  margin: 0 auto 56px;
}
.faq-group-title {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--t);
}
.faq-item:hover { border-color: var(--color-border-light); }
.faq-item.open {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-yellow);
}
.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--t-fast);
}
.faq-q:hover { color: var(--color-primary); }
.faq-icon {
  font-size: 22px;
  font-weight: 300;
  color: var(--color-primary);
  flex-shrink: 0;
  width: 24px;
  text-align: center;
  transition: transform var(--t);
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--t);
}
.faq-item.open .faq-a { max-height: 800px; }
.faq-a p, .faq-a ol, .faq-a ul {
  margin: 0;
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--color-text-2);
  line-height: 1.75;
}
.faq-a ol, .faq-a ul { margin-left: 24px; padding-top: 8px; }
.faq-a ol li, .faq-a ul li {
  margin-bottom: 6px;
  font-size: 14px;
  color: var(--color-text-2);
}
.faq-a a { color: var(--color-primary); }
.faq-a code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--color-bg-3);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}
.faq-cta {
  text-align: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  max-width: 880px;
  margin: 0 auto;
}
.faq-cta h2 { font-size: 26px; margin-bottom: 8px; }
.faq-cta p { color: var(--color-text-3); margin-bottom: 24px; }
.faq-cta-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* 滚动显示 */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal]:nth-child(2) { transition-delay: 0.08s; }
[data-reveal]:nth-child(3) { transition-delay: 0.16s; }
[data-reveal]:nth-child(4) { transition-delay: 0.24s; }
[data-reveal]:nth-child(5) { transition-delay: 0.32s; }
[data-reveal]:nth-child(6) { transition-delay: 0.4s; }

/* 响应式 */
@media (max-width: 1024px) {
  .guide-layout { grid-template-columns: 1fr; }
  .guide-toc {
    position: static;
    margin-bottom: 24px;
  }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: 1fr; }
  .timeline { padding-left: 50px; }
  .timeline-year { left: -50px; width: 40px; height: 40px; font-size: 11px; }
}
@media (max-width: 640px) {
  .page-hero { padding: 56px 0 32px; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .values-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .guide-content h2 { font-size: 26px; }
  .threshold-row { font-size: 12px; padding: 8px 12px; }
  .faq-q { font-size: 14px; padding: 16px 18px; }
  .faq-a p, .faq-a ol, .faq-a ul { padding-left: 18px; padding-right: 18px; }
}