/* 91-os.click · 91POAPP 官方站 · 琥珀暗夜风格 */
:root {
  --bg-root: #08080a;
  --bg-surface: #101014;
  --bg-elevated: #18181f;
  --bg-card: #1c1c24;
  --border: rgba(255, 255, 255, 0.06);
  --border-orange: rgba(255, 149, 0, 0.35);
  --text: #f2f2f5;
  --text-muted: #9a9aad;
  --text-dim: #5e5e72;
  --orange: #ff9500;
  --orange-deep: #e68600;
  --orange-glow: rgba(255, 149, 0, 0.22);
  --purple: #9d6bff;
  --purple-dim: rgba(157, 107, 255, 0.14);
  --gradient-cta: linear-gradient(135deg, #ff9500 0%, #ff6b00 100%);
  --gradient-hero: linear-gradient(160deg, rgba(255, 149, 0, 0.08) 0%, transparent 45%, rgba(157, 107, 255, 0.06) 100%);
  --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.45);
  --shadow-phone: 0 28px 70px rgba(0, 0, 0, 0.55);
  --nav-h: 58px;
  --adsbar-h: 0px;
  --adsbar-h-active: 88px;
  --radius: 14px;
  --radius-sm: 10px;
  --max-w: 1160px;
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg-root);
  color: var(--text);
  line-height: 1.82;
  font-size: 15px;
  overflow-x: hidden;
  padding-top: var(--nav-h);
}
body.ads-sticky-on { padding-top: calc(var(--nav-h) + var(--adsbar-h-active)); }
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 55% 40% at 85% 0%, var(--orange-glow), transparent),
    radial-gradient(ellipse 40% 30% at 10% 80%, var(--purple-dim), transparent);
  pointer-events: none;
  z-index: 0;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--orange); text-decoration: none; transition: color 0.2s, opacity 0.2s; }
a:hover { color: #ffb84d; }
ul { list-style: none; }

.container {
  width: min(100% - 32px, var(--max-w));
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1200;
  height: var(--nav-h);
  background: rgba(8, 8, 10, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.brand img { height: 36px; width: auto; border-radius: 8px; }
.nav-main { display: none; gap: 4px; }
.nav-main a {
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
}
.nav-main a:hover,
.nav-main a.active {
  color: var(--text);
  background: rgba(255, 149, 0, 0.1);
}
.menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-drawer {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 18px 18px;
  display: none;
  flex-direction: column;
  gap: 4px;
  z-index: 1190;
}
.nav-drawer.open { display: flex; }
.nav-drawer a {
  color: var(--text-muted);
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}
.nav-drawer a:hover { background: rgba(255, 149, 0, 0.08); color: var(--text); }

/* ===== ADS ZONE ===== */
.ads-zone {
  padding: 18px 0 8px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}
.ads-zone-title {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
#ads, #ads-sticky-inner {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px 6px;
  background: transparent;
}
#ads > div, #ads-sticky-inner > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: calc(25% - 6px);
  box-sizing: border-box;
}
#ads img, #ads-sticky-inner img {
  width: 62px;
  height: 62px;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  border: 1px solid var(--border);
}
#ads a, #ads-sticky-inner a { display: inline-block; border-radius: 14px; }
#ads img:hover, #ads-sticky-inner img:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 10px 24px rgba(255, 149, 0, 0.2);
}
#ads figcaption, #ads .caption,
#ads-sticky-inner figcaption, #ads-sticky-inner .caption {
  height: 16px;
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
  max-width: 72px;
  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: 1150;
  background: rgba(16, 16, 20, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-orange);
  padding: 10px 0;
  transform: translateY(-110%);
  opacity: 0;
  transition: transform 0.32s ease, opacity 0.32s ease;
  pointer-events: none;
}
.ads-sticky-bar.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.ads-sticky-bar .container { padding: 0 8px; }
@media (min-width: 768px) {
  #ads > div, #ads-sticky-inner > div { width: calc(12.5% - 6px); }
  #ads img, #ads-sticky-inner img { width: 68px; height: 68px; }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  padding: 48px 0 56px;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 149, 0, 0.1);
  border: 1px solid var(--border-orange);
  font-size: 0.78rem;
  color: var(--orange);
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 18px;
}
.hero-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero h1 {
  font-size: clamp(1.75rem, 5.5vw, 2.65rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.hero h1 em {
  font-style: normal;
  color: var(--orange);
}
.hero-lead {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 24px;
}
.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}
.chip {
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--gradient-cta);
  color: #1a0e00;
  box-shadow: 0 8px 28px var(--orange-glow);
}
.btn-primary:hover { color: #1a0e00; box-shadow: 0 12px 36px rgba(255, 149, 0, 0.35); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--border-orange); color: var(--orange); }

.hero-phones {
  position: relative;
  width: min(100%, 340px);
  height: 380px;
  margin: 0 auto;
}
.phone-card {
  position: absolute;
  width: 52%;
  border-radius: 22px;
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-phone);
  background: var(--bg-card);
  transition: transform 0.4s ease;
}
.phone-card img { width: 100%; aspect-ratio: 9/19; object-fit: cover; }
.phone-card:nth-child(1) { top: 0; left: 0; z-index: 1; transform: rotate(-6deg); }
.phone-card:nth-child(2) { top: 24px; left: 28%; z-index: 2; transform: rotate(2deg); }
.phone-card:nth-child(3) { top: 8px; right: 0; z-index: 3; transform: rotate(8deg); }
.phone-card:nth-child(4) { bottom: 0; left: 18%; z-index: 4; width: 48%; transform: rotate(-2deg); }
.hero-phones:hover .phone-card:nth-child(1) { transform: rotate(-8deg) translateY(-4px); }
.hero-phones:hover .phone-card:nth-child(3) { transform: rotate(10deg) translateY(-6px); }

/* ===== METRICS STRIP ===== */
.metrics {
  padding: 28px 0;
  border-block: 1px solid var(--border);
  background: var(--bg-surface);
}
.metrics-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.metric-item {
  text-align: center;
  padding: 16px 8px;
}
.metric-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--orange);
  line-height: 1.2;
}
.metric-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== SECTIONS ===== */
.section { padding: 56px 0; }
.section-head { margin-bottom: 36px; }
.section-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 10px;
}
.section-head h2 {
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 12px;
}
.section-head p { color: var(--text-muted); max-width: 640px; }

/* 3:7 split blocks */
.split-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-bottom: 48px;
  align-items: center;
}
.split-block.reverse .split-visual { order: -1; }
.split-text { flex: 7; min-width: 0; }
.split-text h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}
.split-text p {
  color: var(--text-muted);
  margin-bottom: 12px;
  font-size: 0.94rem;
}
.split-text ul { margin: 12px 0; }
.split-text li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 0.92rem;
}
.split-text li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
}
.split-visual {
  flex: 3;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  max-width: 280px;
  margin-inline: auto;
}
.split-visual img { width: 100%; }

/* Feature bento */
.bento {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.bento-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: border-color 0.25s;
}
.bento-card:hover { border-color: var(--border-orange); }
.bento-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(255, 149, 0, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 14px;
}
.bento-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.bento-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }

/* Timeline steps */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--purple));
  border-radius: 2px;
}
.timeline-step {
  position: relative;
  margin-bottom: 28px;
  padding-bottom: 4px;
}
.timeline-step::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  border: 2px solid var(--bg-root);
}
.timeline-step h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.timeline-step p { font-size: 0.9rem; color: var(--text-muted); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 10px; }
.faq-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 0.94rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
}
.faq-q::after {
  content: "+";
  font-size: 1.2rem;
  color: var(--orange);
  flex-shrink: 0;
  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-a-inner {
  padding: 0 18px 16px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* CTA band */
.cta-band {
  margin: 48px 0 0;
  padding: 40px 28px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 149, 0, 0.12), rgba(157, 107, 255, 0.08));
  border: 1px solid var(--border-orange);
  text-align: center;
}
.cta-band h2 { font-size: 1.35rem; font-weight: 800; margin-bottom: 10px; }
.cta-band p { color: var(--text-muted); margin-bottom: 20px; font-size: 0.92rem; }

/* ===== SUBPAGE ===== */
.page-hero {
  padding: 36px 0 28px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}
.page-hero h1 { font-size: 1.65rem; font-weight: 800; margin-bottom: 8px; }
.page-hero p { color: var(--text-muted); font-size: 0.92rem; }
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--orange); }
.breadcrumb span.sep { opacity: 0.4; }
.prose {
  padding: 36px 0 56px;
  max-width: 780px;
}
.prose h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text);
}
.prose h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 20px 0 10px;
}
.prose p, .prose li {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 12px;
}
.prose ul, .prose ol { padding-left: 22px; margin-bottom: 16px; }
.prose li { margin-bottom: 6px; }
.prose a { color: var(--orange); }

/* SEO 纯文案模块 */
.seo-article {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  margin-bottom: 20px;
}
.seo-article h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}
.seo-article p {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  line-height: 1.85;
}
.seo-article p:last-child { margin-bottom: 0; }
.text-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.text-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px 20px;
}
.text-panel h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--orange);
}
.text-panel p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.78;
}

/* Error pages */
.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 0;
}
.error-code {
  font-size: 5rem;
  font-weight: 900;
  color: var(--orange);
  line-height: 1;
  opacity: 0.85;
}
.error-page h1 { font-size: 1.4rem; margin: 16px 0 10px; }
.error-page p { color: var(--text-muted); margin-bottom: 24px; }
.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 40px 0 28px;
  margin-top: 20px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-bottom: 28px;
}
.footer-brand img { height: 40px; border-radius: 8px; margin-bottom: 12px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-dim); line-height: 1.7; }
.footer-col h4 {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.footer-col a {
  display: block;
  color: var(--text-dim);
  font-size: 0.86rem;
  padding: 4px 0;
}
.footer-col a:hover { color: var(--orange); }
.footer-bottom {
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ===== RESPONSIVE ===== */
@media (min-width: 640px) {
  .metrics-row { grid-template-columns: repeat(4, 1fr); }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .text-columns { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 768px) {
  .nav-main { display: flex; }
  .menu-btn { display: none; }
  .hero-grid { grid-template-columns: 1fr 1fr; gap: 48px; }
  .hero-phones { width: 100%; height: 420px; margin: 0; }
  .split-block { grid-template-columns: 7fr 3fr; gap: 40px; }
  .split-block.reverse { grid-template-columns: 3fr 7fr; }
  .split-block.reverse .split-text { order: 2; }
  .split-block.reverse .split-visual { order: 1; }
  .split-visual { max-width: none; margin: 0; }
  .bento { grid-template-columns: repeat(3, 1fr); }
  .text-columns.cols-3 { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
  .hero { padding: 64px 0 72px; }
  .section { padding: 72px 0; }
}