/* 91PO视频 — 91-s.monster 独立视觉体系 */
:root {
  --ink: #050508;
  --surface: #0c0c14;
  --panel: #14141f;
  --panel-hover: #1c1c2a;
  --amber: #e07a2f;
  --amber-bright: #f5a04a;
  --violet: #7355e8;
  --violet-soft: #9b7ff5;
  --gold: #d4a853;
  --text-bright: #f4f3f8;
  --text-body: #a8a6b8;
  --text-dim: #636178;
  --line: rgba(255, 255, 255, 0.07);
  --line-accent: rgba(224, 122, 47, 0.35);
  --radius: 12px;
  --radius-lg: 20px;
  --nav-h: 56px;
  --ads-sticky-h: 0px;
  --font: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--ink);
  color: var(--text-body);
  line-height: 1.82;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(165deg, rgba(115, 85, 232, 0.06) 0%, transparent 42%),
    linear-gradient(15deg, rgba(224, 122, 47, 0.04) 0%, transparent 38%);
  pointer-events: none;
  z-index: 0;
}

a { color: var(--violet-soft); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--amber-bright); }

img { max-width: 100%; height: auto; display: block; }

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
  position: relative;
  z-index: 1;
}

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(5, 5, 8, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-bright);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 4px;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  color: var(--text-body);
  font-size: 0.875rem;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--text-bright);
  background: rgba(255, 255, 255, 0.05);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--text-bright);
  width: 40px;
  height: 40px;
  border-radius: 8px;
  font-size: 1.2rem;
  cursor: pointer;
}

/* Ads */
.ads-top-wrap {
  margin-top: calc(var(--nav-h) + 8px);
  padding: 12px 0 4px;
  scroll-margin-top: calc(var(--nav-h) + 8px);
}

#ads,
#ads-sticky {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px 12px;
  background: transparent;
}

#ads > div,
#ads-sticky > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 70px;
}

#ads img,
#ads-sticky img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  transition: transform 0.18s, box-shadow 0.18s;
  border: 1px solid var(--line);
}

#ads a,
#ads-sticky a { display: inline-block; border-radius: 16px; }

#ads img:hover,
#ads-sticky img:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 8px 22px rgba(224, 122, 47, 0.2);
}

#ads .caption,
#ads-sticky .caption {
  height: 15px;
  font-size: 11px;
  color: var(--text-dim);
  text-align: center;
  max-width: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}

.ads-sticky-bar {
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  z-index: 999;
  background: rgba(12, 12, 20, 0.97);
  border-bottom: 1px solid var(--line);
  padding: 8px 0;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.28s, opacity 0.28s;
}

.ads-sticky-bar.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

body.ads-sticky-active {
  --ads-sticky-h: 88px;
}

body.ads-sticky-active main,
body.ads-sticky-active .page-main {
  scroll-margin-top: calc(var(--nav-h) + var(--ads-sticky-h));
}

/* Hero — 无下载按钮 */
.masthead {
  padding: 48px 0 56px;
  position: relative;
}

.masthead-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  border-left: 3px solid var(--amber);
  padding-left: 12px;
  margin-bottom: 20px;
}

.masthead h1 {
  font-size: clamp(1.75rem, 5.5vw, 2.65rem);
  font-weight: 800;
  color: var(--text-bright);
  line-height: 1.25;
  margin-bottom: 18px;
  max-width: 680px;
}

.masthead-lead {
  font-size: 1.02rem;
  color: var(--text-body);
  max-width: 620px;
  margin-bottom: 32px;
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  max-width: 680px;
}

.metric-cell {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 12px;
  text-align: center;
}

.metric-cell strong {
  display: block;
  font-size: 1.35rem;
  color: var(--amber-bright);
  font-weight: 800;
  line-height: 1.2;
}

.metric-cell span {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 4px;
  display: block;
}

/* Section */
.section {
  padding: 52px 0;
  border-top: 1px solid var(--line);
}

.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--violet-soft);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section h2 {
  font-size: clamp(1.35rem, 4vw, 1.85rem);
  color: var(--text-bright);
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.35;
}

.section-desc {
  color: var(--text-dim);
  font-size: 0.92rem;
  margin-bottom: 32px;
  max-width: 560px;
}

/* 3:7 Editorial Split */
.editorial-split {
  display: grid;
  grid-template-columns: 30fr 70fr;
  gap: 28px;
  align-items: start;
  margin-bottom: 40px;
}

.editorial-split.reverse {
  direction: rtl;
}

.editorial-split.reverse > * {
  direction: ltr;
}

.editorial-visual {
  position: relative;
}

.editorial-visual img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
}

.editorial-visual::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--line-accent), transparent 60%);
  pointer-events: none;
  z-index: -1;
}

.editorial-body h3 {
  font-size: 1.15rem;
  color: var(--text-bright);
  margin-bottom: 14px;
  font-weight: 700;
}

.editorial-body p {
  margin-bottom: 14px;
  font-size: 0.93rem;
}

.editorial-body ul {
  list-style: none;
  margin: 16px 0;
}

.editorial-body li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.editorial-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
}

/* Bento Features */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.bento-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 18px;
  transition: border-color 0.2s, background 0.2s;
}

.bento-item:hover {
  border-color: var(--line-accent);
  background: var(--panel-hover);
}

.bento-icon {
  font-size: 1.5rem;
  margin-bottom: 12px;
  line-height: 1;
}

.bento-item h3 {
  font-size: 0.95rem;
  color: var(--text-bright);
  margin-bottom: 8px;
  font-weight: 600;
}

.bento-item p {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.65;
}

/* CTA */
.cta-band {
  background: linear-gradient(135deg, rgba(115, 85, 232, 0.12), rgba(224, 122, 47, 0.08));
  border: 1px solid var(--line-accent);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  margin: 20px 0;
}

.cta-band h2 {
  font-size: 1.4rem;
  color: var(--text-bright);
  margin-bottom: 10px;
}

.cta-band p {
  font-size: 0.9rem;
  margin-bottom: 22px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.btn-primary {
  display: inline-block;
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--amber), var(--amber-bright));
  color: #1a0e04;
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(224, 122, 47, 0.3);
}

.btn-primary:hover {
  color: #1a0e04;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(224, 122, 47, 0.4);
}

/* FAQ */
.faq-list { max-width: 720px; }

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  background: none;
  border: none;
  color: var(--text-bright);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
}

.faq-q::after {
  content: "+";
  font-size: 1.2rem;
  color: var(--amber);
  transition: transform 0.25s;
}

.faq-item.open .faq-q::after {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-item.open .faq-a {
  max-height: 600px;
}

.faq-a p {
  padding-bottom: 18px;
  font-size: 0.88rem;
}

/* Prose block (text-only SEO sections) */
.prose-block {
  max-width: 760px;
}

.prose-block h3 {
  font-size: 1.08rem;
  color: var(--text-bright);
  margin: 28px 0 12px;
  font-weight: 700;
}

.prose-block p {
  margin-bottom: 14px;
  font-size: 0.92rem;
}

.prose-block ul {
  list-style: none;
  margin: 12px 0 18px;
}

.prose-block li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.prose-block li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--violet-soft);
}

.prose-wide {
  max-width: 100%;
}

/* Channel cards — 纯文案 SEO 模块 */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 8px;
}

.channel-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 18px;
}

.channel-card h3 {
  font-size: 0.95rem;
  color: var(--amber-bright);
  margin-bottom: 10px;
  font-weight: 700;
}

.channel-card p {
  font-size: 0.85rem;
  color: var(--text-body);
  line-height: 1.72;
}

/* SEO highlight panel */
.seo-panel {
  background: var(--panel);
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 22px 20px;
  margin: 24px 0;
}

.seo-panel p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

.seo-panel p + p {
  margin-top: 12px;
}

/* Two-column text */
.text-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 8px;
}

.text-col h3 {
  font-size: 1rem;
  color: var(--text-bright);
  margin-bottom: 12px;
  font-weight: 700;
}

.text-col p {
  font-size: 0.88rem;
  margin-bottom: 12px;
}

@media (max-width: 680px) {
  .channel-grid,
  .text-columns {
    grid-template-columns: 1fr;
  }
}

/* Steps */
.step-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 28px 0;
}

.step-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 14px;
  text-align: center;
}

.step-num {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--violet), var(--violet-soft));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  margin: 0 auto 12px;
}

.step-card h4 {
  font-size: 0.85rem;
  color: var(--text-bright);
  margin-bottom: 6px;
}

.step-card p {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 28px;
  margin-top: 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}

.footer-brand p {
  font-size: 0.85rem;
  margin-top: 10px;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.82rem;
  color: var(--text-bright);
  margin-bottom: 12px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.footer-col a:hover { color: var(--amber-bright); }

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  font-size: 0.78rem;
  color: var(--text-dim);
  text-align: center;
}

/* Subpages */
.page-main {
  margin-top: var(--nav-h);
  padding: 32px 0 56px;
  min-height: calc(100vh - 200px);
}

.breadcrumb {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--amber-bright); }
.breadcrumb span { color: var(--text-body); }

.page-title {
  font-size: 1.65rem;
  color: var(--text-bright);
  font-weight: 700;
  margin-bottom: 24px;
}

.legal-content h2 {
  font-size: 1.05rem;
  color: var(--text-bright);
  margin: 28px 0 12px;
  font-weight: 600;
}

.legal-content p,
.legal-content li {
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.legal-content ul {
  padding-left: 20px;
  margin-bottom: 16px;
}

/* Error pages */
.error-page {
  text-align: center;
  padding: 80px 0 100px;
}

.error-code {
  font-size: 5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--amber), var(--violet-soft));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

.error-page h1 {
  font-size: 1.4rem;
  color: var(--text-bright);
  margin-bottom: 12px;
}

.error-page p {
  margin-bottom: 28px;
  font-size: 0.92rem;
}

/* Responsive */
@media (max-width: 860px) {
  .editorial-split {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .editorial-split.reverse { direction: ltr; }

  .bento-grid { grid-template-columns: repeat(2, 1fr); }

  .metric-strip { grid-template-columns: repeat(2, 1fr); }

  .step-row { grid-template-columns: repeat(2, 1fr); }

  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .nav-toggle { display: block; }

  .nav-list {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: rgba(5, 5, 8, 0.98);
    flex-direction: column;
    padding: 12px 16px 20px;
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.28s, opacity 0.28s;
  }

  .nav-list.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list a {
    padding: 12px 14px;
    font-size: 0.95rem;
  }

  .bento-grid { grid-template-columns: 1fr; }

  .masthead { padding: 32px 0 40px; }

  .section { padding: 36px 0; }
}