/* =====================================================================
   常见问题页 faq.css
   视觉规范与全站设计系统（site.css）保持一致；
   为避免影响站点公共头部/底部，所有选择器统一限定在 .faq-page 作用域内。
   主题：research（人因 · 心理科研平台 · 科技蓝）
   ===================================================================== */

/* ---------- 1. 基础令牌 ---------- */
.faq-page {
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --hd-h: 72px;
  --wrap: 1200px;
  --radius: 14px;
  --radius-lg: 20px;

  --brand: #2563eb;
  --brand-deep: #1e3a8a;
  --brand-ink: #172554;
  --brand-soft: #ebf2ff;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.14);
  --bg: #f8faff;
  --bg-2: #f1f5fe;
  --surface: #ffffff;
  --ink: #0f172a;
  --text: #1f2329;
  --muted: #64748b;
  --line: rgba(15, 23, 42, 0.09);
  --line-2: rgba(37, 99, 235, 0.12);
  --shadow: 0 4px 18px rgba(15, 23, 42, 0.05);
  --shadow-h: 0 18px 40px rgba(37, 99, 235, 0.15);
  --hero-grad: linear-gradient(140deg, #050e24 0%, #0a1e42 45%, #122b5c 100%);
  --dark: #0a0f1e;
  --dark-2: #0a1e42;

  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 2. 局部重置 ---------- */
.faq-page *,
.faq-page *::before,
.faq-page *::after {
  box-sizing: border-box;
}
/* 卡片/列表项显式声明 display:flex/grid 时会覆盖 UA 的 [hidden]，必须强制 */
.faq-page [hidden] {
  display: none !important;
}
.faq-page a {
  color: inherit;
  text-decoration: none;
}
.faq-page ul,
.faq-page ol {
  list-style: none;
  margin: 0;
  padding: 0;
}
.faq-page h1,
.faq-page h2,
.faq-page h3,
.faq-page p {
  margin: 0;
  padding: 0;
}
.faq-page button {
  font: inherit;
  border: 0;
  background: none;
  cursor: pointer;
  color: inherit;
}
.faq-page img {
  max-width: 100%;
  display: block;
}
.faq-page :focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 3px;
}
@media (prefers-reduced-motion: reduce) {
  .faq-page *,
  .faq-page *::before,
  .faq-page *::after {
    animation: none !important;
    transition: none !important;
  }
}

.faq-page .wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- 3. 通用块级 ---------- */
.faq-page .sec {
  padding: 88px 0;
}
.faq-page .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.76);
}
.faq-page .eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

/* ---------- 4. Hero ---------- */
.faq-page .hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background: var(--hero-grad);
  padding: 64px 0 76px;
}
.faq-page .hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
      70% 80% at 88% 8%,
      rgba(255, 255, 255, 0.16) 0%,
      transparent 56%
    ),
    radial-gradient(
      50% 60% at 4% 92%,
      rgba(255, 255, 255, 0.08) 0%,
      transparent 62%
    );
}
.faq-page .hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(
      rgba(255, 255, 255, 0.05) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 54px 54px;
  -webkit-mask-image: radial-gradient(
    70% 80% at 50% 50%,
    #000 0%,
    transparent 82%
  );
  mask-image: radial-gradient(70% 80% at 50% 50%, #000 0%, transparent 82%);
}
.faq-page .hero > .wrap {
  position: relative;
  z-index: 2;
}
.faq-page .hero .top-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  z-index: 3;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.5),
    rgba(255, 255, 255, 0.16),
    transparent
  );
}
.faq-page .hero h1 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  line-height: 1.2;
  letter-spacing: 0.03em;
  margin: 20px 0 20px;
  max-width: 17em;
}
.faq-page .hero h1.grad {
  background: linear-gradient(180deg, #ffffff 0%, #d8e4ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.faq-page .hero-sub {
  font-size: clamp(1rem, 1.4vw, 1.14rem);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.84);
  max-width: 35em;
  line-height: 1.9;
}
.faq-page .hero-metrics {
  margin-top: 30px;
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}
.faq-page .hero-metric {
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.faq-page .hero-metric b {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.38rem;
  color: #fff;
}
.faq-page .hero-metric span {
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.62);
}

/* ---------- 5. 面包屑 ---------- */
.faq-page .crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.faq-page .crumb a {
  color: rgba(255, 255, 255, 0.74);
  transition: color 0.2s;
}
.faq-page .crumb a:hover {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.faq-page .crumb svg {
  width: 12px;
  height: 12px;
  opacity: 0.55;
  flex: none;
}
.faq-page .crumb .cur {
  color: rgba(255, 255, 255, 0.94);
}

/* ---------- 6. 页签 ---------- */
.faq-page .tabs {
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-bottom: 34px;
  flex-wrap: wrap;
}
.faq-page .tab {
  padding: 9px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line-2);
  transition: all 0.22s var(--ease);
}
.faq-page .tab:hover {
  color: var(--brand);
  border-color: var(--brand);
}
.faq-page .tab.on {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
  box-shadow: 0 6px 18px var(--brand-soft);
}
.faq-page .pane[hidden] {
  display: none;
}
.faq-page .empty {
  padding: 56px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}
.faq-page .loading {
  padding: 56px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- 7. 手风琴 ---------- */
.faq-page .faq-group-title {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--ink);
  margin: 40px 0 16px;
}
.faq-page .faq-group:first-child .faq-group-title {
  margin: 0 16px;
}
.faq-page .acc {
  max-width: 940px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}
.faq-page .acc details {
  background: var(--surface);
  border: 1px solid var(--line-2);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: border-color 0.22s, box-shadow 0.22s;
}
.faq-page .acc details[open] {
  border-color: var(--brand);
  box-shadow: var(--shadow-h);
}
.faq-page .acc summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  padding: 18px 22px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.6;
  list-style: none;
}
.faq-page .acc summary::-webkit-details-marker {
  display: none;
}
.faq-page .acc summary::before {
  content: "Q";
  flex: none;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  margin-top: 2px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 12px;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.faq-page .acc summary::after {
  content: "";
  flex: none;
  width: 10px;
  height: 10px;
  margin-left: auto;
  margin-top: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.24s var(--ease);
}
.faq-page .acc details[open] summary::after {
  transform: rotate(-135deg);
}
.faq-page .acc .a-body {
  padding: 0 22px 20px 56px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.85;
}
.faq-page .acc .a-body p + p {
  margin-top: 10px;
}
.faq-page .acc .a-body ul {
  margin: 10px 0 0;
  display: grid;
  gap: 6px;
}
.faq-page .acc .a-body li {
  position: relative;
  padding-left: 16px;
}
.faq-page .acc .a-body li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 11px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--brand);
}

/* ---------- 8. 按钮 ---------- */
.faq-page .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 26px;
  border-radius: 11px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
    background 0.2s, color 0.2s, border-color 0.2s;
}
.faq-page .btn:hover {
  transform: translateY(-2px);
}
.faq-page .btn svg {
  width: 17px;
  height: 17px;
  flex: none;
}
.faq-page .btn-solid {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #fff;
  box-shadow: 0 10px 26px var(--brand-soft);
}
.faq-page .btn-solid:hover {
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.2);
  filter: brightness(1.06);
}
.faq-page .btn-block {
  width: 100%;
}

/* ---------- 9. CTA + 表单 ---------- */
.faq-page .cta {
  position: relative;
  overflow: hidden;
  background: var(--hero-grad);
  color: #fff;
  padding: 80px 0;
}
.faq-page .cta::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    70% 100% at 12% 8%,
    rgba(255, 255, 255, 0.14) 0%,
    transparent 56%
  );
}
.faq-page .cta .wrap {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 54px;
  align-items: center;
}
.faq-page .cta-text h2 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.35rem);
  line-height: 1.28;
  margin: 14px 0 16px;
  color: #fff;
}
.faq-page .cta-text > p {
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.86);
  max-width: 30em;
}
.faq-page .cta-points {
  margin-top: 22px;
  display: grid;
  gap: 10px;
}
.faq-page .cta-points li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.93rem;
  color: rgba(255, 255, 255, 0.92);
}
.faq-page .cta-points svg {
  width: 17px;
  height: 17px;
  flex: none;
  margin-top: 4px;
  color: var(--accent);
}
.faq-page .form {
  background: rgba(255, 255, 255, 0.985);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.32);
  color: var(--text);
}
.faq-page .form h3 {
  font-size: 1.1rem;
  color: var(--ink);
  margin-bottom: 6px;
}
.faq-page .form .hint {
  font-size: 0.83rem;
  color: var(--muted);
  margin-bottom: 20px;
}
.faq-page .frow {
  display: grid;
  gap: 12px;
  margin-bottom: 12px;
}
.faq-page .frow.two {
  grid-template-columns: 1fr 1fr;
}
.faq-page .ffield {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.faq-page .ffield label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink);
}
.faq-page .ffield input,
.faq-page .ffield select,
.faq-page .ffield textarea {
  font: inherit;
  font-size: 0.92rem;
  color: var(--text);
  width: 100%;
  padding: 11px 13px;
  border-radius: 9px;
  border: 1.5px solid var(--line);
  background: #fff;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.faq-page .ffield textarea {
  resize: vertical;
  min-height: 76px;
}
.faq-page .ffield input::placeholder,
.faq-page .ffield textarea::placeholder {
  color: rgba(15, 23, 42, 0.32);
}
.faq-page .ffield input:focus,
.faq-page .ffield select:focus,
.faq-page .ffield textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-soft);
}
.faq-page .fnote {
  font-size: 0.76rem;
  color: var(--muted);
  margin-top: 10px;
  text-align: center;
  line-height: 1.6;
}
.faq-page .fstatus {
  display: none;
  font-size: 0.83rem;
  font-weight: 500;
  margin-top: 10px;
  text-align: center;
}
.faq-page .fstatus.on {
  display: block;
}
.faq-page .fstatus.ok {
  color: #047857;
}
.faq-page .fstatus.err {
  color: #b91c1c;
}

/* ---------- 10. 入场动画 ---------- */
.faq-page .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.72s var(--ease), transform 0.72s var(--ease);
}
.faq-page .reveal.is-in {
  opacity: 1;
  transform: none;
}
.faq-page .d1 {
  transition-delay: 0.08s;
}
.faq-page .d2 {
  transition-delay: 0.16s;
}
.faq-page .d3 {
  transition-delay: 0.24s;
}
.faq-page .d4 {
  transition-delay: 0.32s;
}
@media (prefers-reduced-motion: reduce) {
  .faq-page .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 11. 工具类 ---------- */
.faq-page .txt-c {
  text-align: center;
}
.faq-page .mt8 {
  margin-top: 8px;
}
.faq-page .mt16 {
  margin-top: 16px;
}
.faq-page .mt24 {
  margin-top: 24px;
}
.faq-page .mt32 {
  margin-top: 32px;
}
.faq-page .mt48 {
  margin-top: 48px;
}
.faq-page .mt64 {
  margin-top: 64px;
}
.faq-page .mb0 {
  margin-bottom: 0;
}
.faq-page .note {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.75;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1080px) {
  .faq-page .cta .wrap {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}
@media (max-width: 720px) {
  .faq-page .sec {
    padding: 64px 0;
  }
  .faq-page .wrap {
    padding: 0 18px;
  }
  .faq-page .hero {
    padding: 52px 0 52px;
  }
  .faq-page .hero h1 {
    font-size: clamp(1.85rem, 7.4vw, 2.4rem);
  }
  .faq-page .tabs {
    gap: 4px;
  }
  .faq-page .tab {
    padding: 8px 16px;
    font-size: 13px;
  }
  .faq-page .acc summary {
    padding: 16px 18px;
    font-size: 14.5px;
  }
  .faq-page .acc .a-body {
    padding: 0 18px 18px 18px;
  }
  .faq-page .form {
    padding: 22px;
  }
  .faq-page .frow.two {
    grid-template-columns: 1fr;
  }
  .faq-page .btn {
    min-height: 44px;
    padding: 0 20px;
    font-size: 14px;
  }
}