/* 91PO 官网下载中心 — 紫雾午夜视觉体系 */
:root {
  --void: #08060f;
  --plum: #120c1e;
  --plum-light: #1a1228;
  --plum-card: #1e1530;
  --violet: #7c3aed;
  --violet-glow: #a78bfa;
  --magenta: #db2777;
  --rose: #f472b6;
  --amber: #f59e0b;
  --amber-soft: #fbbf24;
  --mist: #ede9f5;
  --mist-dim: #a89bb8;
  --mist-faint: #6b5f7a;
  --border-violet: rgba(124, 58, 237, 0.28);
  --border-rose: rgba(244, 114, 182, 0.2);
  --grad-hero: linear-gradient(145deg, #1a0a2e 0%, #0c0818 45%, #150a1a 100%);
  --grad-accent: linear-gradient(120deg, var(--violet) 0%, var(--magenta) 50%, var(--amber) 100%);
  --grad-card: linear-gradient(160deg, rgba(124,58,237,0.08) 0%, rgba(219,39,119,0.05) 100%);
  --shadow-glow: 0 0 60px rgba(124, 58, 237, 0.15);
  --radius: 18px;
  --nav-h: 58px;
  --sticky-ads-h: 0px;
  font-size: 16px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--void);
  color: var(--mist);
  line-height: 1.85;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 0%, rgba(124, 58, 237, 0.12), transparent),
    radial-gradient(ellipse 45% 40% at 90% 80%, rgba(219, 39, 119, 0.1), transparent),
    radial-gradient(ellipse 30% 25% at 50% 50%, rgba(245, 158, 11, 0.04), transparent);
  pointer-events: none;
  z-index: 0;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--violet-glow); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--rose); }

.wrap {
  width: min(1100px, 92vw);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* ===== 顶栏 ===== */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 200;
  background: rgba(8, 6, 15, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-violet);
}

.top-bar-inner {
  width: min(1100px, 92vw);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--mist);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--mist);
  border-radius: 2px;
  transition: 0.25s;
}

.site-menu {
  display: flex;
  gap: 4px;
}

.site-menu a {
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--mist-dim);
  font-size: 0.9rem;
  transition: background 0.2s, color 0.2s;
}

.site-menu a:hover,
.site-menu a.current {
  background: rgba(124, 58, 237, 0.18);
  color: var(--mist);
}

/* ===== 粘性广告栏 ===== */
.sticky-dl-bar {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 190;
  background: rgba(12, 8, 24, 0.97);
  border-bottom: 1px solid var(--border-rose);
  padding: 8px 0;
  transform: translateY(-110%);
  opacity: 0;
  transition: transform 0.35s ease, opacity 0.35s ease;
  pointer-events: none;
}

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

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

/* ===== 广告区 ===== */
#ads,
#sticky-ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px 6px;
  background: transparent;
}

#ads > div,
#sticky-ads > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: calc(25% - 6px);
  box-sizing: border-box;
}

#ads img,
#sticky-ads img {
  width: 62px;
  height: 62px;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.2);
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--border-violet);
}

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

#ads img:hover,
#sticky-ads img:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 24px rgba(219, 39, 119, 0.3);
}

#ads .caption,
#sticky-ads .caption {
  height: 15px;
  font-size: 10px;
  color: var(--mist-faint);
  text-align: center;
  max-width: 72px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}

@media (min-width: 768px) {
  #ads > div,
  #sticky-ads > div {
    width: calc(12.5% - 6px);
  }
  #ads img,
  #sticky-ads img {
    width: 58px;
    height: 58px;
  }
}

.dl-zone {
  padding: calc(var(--nav-h) + 20px) 0 28px;
  position: relative;
  z-index: 1;
}

.dl-zone-label {
  text-align: center;
  font-size: 0.78rem;
  color: var(--mist-faint);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* ===== Hero ===== */
.hero-panel {
  padding: 48px 0 64px;
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
}

.hero-panel::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(to top, var(--void), transparent);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(1.65rem, 5vw, 2.4rem);
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 18px;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text h1 em {
  font-style: normal;
  display: block;
  font-size: 0.55em;
  font-weight: 500;
  color: var(--mist-dim);
  -webkit-text-fill-color: var(--mist-dim);
  margin-top: 8px;
  letter-spacing: 0.06em;
}

.hero-lead {
  color: var(--mist-dim);
  font-size: 0.95rem;
  margin-bottom: 22px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-tags span {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.78rem;
  background: rgba(124, 58, 237, 0.12);
  border: 1px solid var(--border-violet);
  color: var(--violet-glow);
}

.hero-phones {
  position: relative;
  height: 380px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-card {
  position: absolute;
  width: 175px;
  border-radius: 22px;
  overflow: hidden;
  border: 2px solid rgba(167, 139, 250, 0.35);
  box-shadow: var(--shadow-glow);
  transition: transform 0.4s ease;
}

.phone-card img {
  width: 100%;
  aspect-ratio: 9/16;
  object-fit: cover;
}

.phone-card:nth-child(1) {
  transform: rotate(-8deg) translateX(-70px) translateY(10px);
  z-index: 1;
}

.phone-card:nth-child(2) {
  transform: rotate(2deg) translateY(-8px);
  z-index: 3;
  border-color: rgba(244, 114, 182, 0.5);
}

.phone-card:nth-child(3) {
  transform: rotate(10deg) translateX(70px) translateY(14px);
  z-index: 2;
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 32px;
  }
  .hero-phones { height: 420px; }
  .phone-card { width: 195px; }
}

/* ===== 通用区块 ===== */
.block {
  padding: 56px 0;
}

.block-head {
  margin-bottom: 36px;
}

.kicker {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.25em;
  color: var(--rose);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.block-head h2 {
  font-size: clamp(1.35rem, 3.5vw, 1.85rem);
  font-weight: 700;
  color: var(--mist);
  margin-bottom: 12px;
}

.block-head p {
  color: var(--mist-dim);
  font-size: 0.92rem;
  max-width: 680px;
}

/* ===== 数据条 ===== */
.stat-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 48px;
}

.stat-cell {
  padding: 20px;
  border-radius: var(--radius);
  background: var(--grad-card);
  border: 1px solid var(--border-violet);
  text-align: center;
}

.stat-cell strong {
  display: block;
  font-size: 1.5rem;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}

.stat-cell span {
  font-size: 0.8rem;
  color: var(--mist-faint);
}

@media (min-width: 600px) {
  .stat-row { grid-template-columns: repeat(4, 1fr); }
}

/* ===== 功能模块（3:7 图文） ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-bottom: 48px;
  align-items: start;
}

.feature-block.reverse .feature-visual { order: -1; }

.feature-visual {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-violet);
  box-shadow: var(--shadow-glow);
  max-width: 280px;
  margin: 0 auto;
}

.feature-visual img {
  width: 100%;
  aspect-ratio: 9/16;
  object-fit: cover;
}

.feature-body h3 {
  font-size: 1.2rem;
  color: var(--mist);
  margin-bottom: 14px;
  padding-left: 14px;
  border-left: 3px solid var(--magenta);
}

.feature-body p {
  color: var(--mist-dim);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.feature-body ul {
  list-style: none;
  margin-top: 14px;
}

.feature-body li {
  position: relative;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--mist-faint);
  margin-bottom: 8px;
}

.feature-body li::before {
  content: "◆";
  position: absolute;
  left: 0;
  color: var(--violet);
  font-size: 0.55rem;
  top: 4px;
}

@media (min-width: 768px) {
  .feature-block {
    grid-template-columns: 3fr 7fr;
    gap: 36px;
  }
  .feature-block.reverse {
    grid-template-columns: 7fr 3fr;
  }
  .feature-block.reverse .feature-visual { order: 0; }
  .feature-visual { max-width: none; margin: 0; }
}

/* ===== Bento 网格 ===== */
.bento-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 48px;
}

.bento-item {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--plum-card);
  border: 1px solid var(--border-violet);
}

.bento-item h4 {
  font-size: 1rem;
  color: var(--violet-glow);
  margin-bottom: 10px;
}

.bento-item p {
  font-size: 0.88rem;
  color: var(--mist-dim);
}

@media (min-width: 600px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento-item.wide {
    grid-column: span 2;
  }
}

/* ===== 纯文案 SEO 区 ===== */
.prose-block {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--plum-light);
  border: 1px solid var(--border-rose);
  margin-bottom: 40px;
}

.prose-block h3 {
  font-size: 1.15rem;
  color: var(--rose);
  margin-bottom: 16px;
}

.prose-block p {
  font-size: 0.9rem;
  color: var(--mist-dim);
  margin-bottom: 12px;
}

.prose-block a {
  color: var(--amber-soft);
}

.prose-block h4 {
  font-size: 1rem;
  color: var(--violet-glow);
  margin: 20px 0 10px;
}

/* ===== 画廊条 ===== */
.gallery-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 48px;
}

.gallery-cell {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-violet);
  background: var(--plum-card);
}

.gallery-cell img {
  width: 100%;
  aspect-ratio: 9/16;
  object-fit: cover;
}

.gallery-cell figcaption {
  padding: 12px 14px;
  font-size: 0.82rem;
  color: var(--mist-dim);
  line-height: 1.6;
}

.gallery-cell figcaption strong {
  display: block;
  color: var(--mist);
  font-size: 0.88rem;
  margin-bottom: 4px;
}

@media (min-width: 600px) {
  .gallery-strip { grid-template-columns: repeat(4, 1fr); }
}

/* ===== 双栏 SEO 文案 ===== */
.seo-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.seo-col {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--plum-card);
  border: 1px solid var(--border-violet);
}

.seo-col h3 {
  font-size: 1.05rem;
  color: var(--rose);
  margin-bottom: 14px;
}

.seo-col p {
  font-size: 0.88rem;
  color: var(--mist-dim);
  margin-bottom: 10px;
}

@media (min-width: 768px) {
  .seo-columns { grid-template-columns: 1fr 1fr; }
}

/* ===== FAQ ===== */
.faq-block {
  margin-bottom: 48px;
}

.faq-block h2 {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  color: var(--mist);
  margin-bottom: 24px;
}

.faq-item {
  border-bottom: 1px solid rgba(124, 58, 237, 0.15);
  padding: 20px 0;
}

.faq-item:first-of-type { padding-top: 0; }

.faq-item h3 {
  font-size: 0.95rem;
  color: var(--violet-glow);
  margin-bottom: 10px;
  font-weight: 600;
}

.faq-item p {
  font-size: 0.88rem;
  color: var(--mist-dim);
  line-height: 1.8;
}

/* ===== 步骤指南 ===== */
.steps-list {
  counter-reset: step;
  list-style: none;
  margin-bottom: 40px;
}

.steps-list li {
  position: relative;
  padding: 20px 20px 20px 56px;
  margin-bottom: 12px;
  border-radius: var(--radius);
  background: var(--plum-card);
  border: 1px solid var(--border-violet);
  font-size: 0.88rem;
  color: var(--mist-dim);
}

.steps-list li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 18px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--grad-accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.steps-list li strong {
  display: block;
  color: var(--mist);
  font-size: 0.92rem;
  margin-bottom: 6px;
}

/* ===== CTA ===== */
.cta-band {
  text-align: center;
  padding: 48px 24px;
  border-radius: var(--radius);
  background: var(--grad-card);
  border: 1px solid var(--border-violet);
  margin: 40px 0;
}

.cta-band h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.cta-band p {
  color: var(--mist-dim);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.btn-dl {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 999px;
  background: var(--grad-accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-dl:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(219, 39, 119, 0.4);
}

/* ===== 子页面 ===== */
.page-hero {
  padding: calc(var(--nav-h) + 40px) 0 32px;
  background: var(--grad-hero);
}

.page-hero h1 {
  font-size: clamp(1.4rem, 4vw, 2rem);
  margin-bottom: 8px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--mist-faint);
  margin-bottom: 16px;
}

.breadcrumb a { color: var(--mist-dim); }
.breadcrumb span.sep { opacity: 0.4; }

.page-content {
  padding: 40px 0 64px;
}

.legal-doc h2 {
  font-size: 1.1rem;
  color: var(--violet-glow);
  margin: 28px 0 12px;
}

.legal-doc p,
.legal-doc li {
  font-size: 0.9rem;
  color: var(--mist-dim);
  margin-bottom: 10px;
}

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

/* ===== 错误页 ===== */
.error-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: var(--nav-h);
}

.error-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-code {
  font-size: 5rem;
  font-weight: 800;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

.error-body h1 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.error-body p {
  color: var(--mist-dim);
  font-size: 0.9rem;
  margin-bottom: 24px;
  max-width: 400px;
}

.btn-back {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  border: 1px solid var(--border-violet);
  color: var(--violet-glow);
  font-size: 0.9rem;
  transition: background 0.2s;
}

.btn-back:hover {
  background: rgba(124, 58, 237, 0.15);
  color: var(--rose);
}

/* ===== 页脚 ===== */
.site-foot {
  padding: 40px 0 32px;
  border-top: 1px solid var(--border-violet);
  background: var(--plum);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 28px;
}

.foot-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.foot-brand img { width: 32px; border-radius: 8px; }

.foot-brand span {
  font-weight: 700;
  color: var(--mist);
}

.foot-desc {
  font-size: 0.82rem;
  color: var(--mist-faint);
}

.foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.foot-links a {
  font-size: 0.82rem;
  color: var(--mist-dim);
}

.foot-copy {
  text-align: center;
  font-size: 0.75rem;
  color: var(--mist-faint);
  padding-top: 20px;
  border-top: 1px solid rgba(124, 58, 237, 0.12);
}

@media (min-width: 600px) {
  .foot-grid { grid-template-columns: 1.2fr 1fr; }
}

/* ===== 移动端导航 ===== */
@media (max-width: 767px) {
  .menu-btn { display: flex; }
  .site-menu {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(8, 6, 15, 0.98);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--border-violet);
    transform: translateY(-120%);
    opacity: 0;
    transition: 0.3s;
    pointer-events: none;
  }
  .site-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .site-menu a {
    padding: 12px 16px;
    border-radius: var(--radius);
  }
}