/* 91PORN 91PO官网 — 深空霓虹·丝绒魅影风格 */
:root {
  --nx-void: #05040c;
  --nx-deep: #0c0a18;
  --nx-panel: #12101f;
  --nx-card: #18152a;
  --nx-border: rgba(139, 92, 246, 0.22);
  --nx-text: #ece8f4;
  --nx-muted: #9b93b0;
  --nx-violet: #8b5cf6;
  --nx-magenta: #d946a8;
  --nx-orange: #ff6b2b;
  --nx-glow: rgba(217, 70, 168, 0.28);
  --nx-grad: linear-gradient(135deg, #8b5cf6 0%, #d946a8 48%, #ff6b2b 100%);
  --nx-grad-soft: linear-gradient(180deg, rgba(139,92,246,0.12) 0%, transparent 70%);
  --nx-radius: 14px;
  --nx-header: 60px;
  --nx-font-display: "SimSun", "宋体", "STSong", serif;
  --nx-font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

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

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

body {
  font-family: var(--nx-font-body);
  background: var(--nx-void);
  color: var(--nx-text);
  line-height: 1.85;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 0%, rgba(139,92,246,0.11) 0%, transparent 55%),
    radial-gradient(ellipse 50% 45% at 5% 100%, rgba(255,107,43,0.08) 0%, transparent 50%),
    radial-gradient(ellipse 40% 35% at 50% 50%, rgba(217,70,168,0.05) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

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

a { color: var(--nx-violet); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--nx-orange); }

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

/* Header */
.nx-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nx-header);
  background: rgba(5, 4, 12, 0.94);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--nx-border);
  z-index: 1000;
}

.nx-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nx-header);
}

.nx-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--nx-text);
  font-family: var(--nx-font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nx-brand img { border-radius: 10px; }

.nx-nav { display: flex; gap: 24px; }

.nx-nav a {
  color: var(--nx-muted);
  font-size: 0.88rem;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nx-nav a:hover,
.nx-nav a.is-on {
  color: var(--nx-text);
  border-bottom-color: var(--nx-magenta);
}

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

.nx-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--nx-text);
  border-radius: 2px;
}

.nx-drawer {
  position: fixed;
  top: var(--nx-header);
  right: -290px;
  width: 270px;
  height: calc(100vh - var(--nx-header));
  background: var(--nx-panel);
  border-left: 1px solid var(--nx-border);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  z-index: 999;
  transition: right 0.3s ease;
}

.nx-drawer.open { right: 0; }

.nx-drawer a {
  color: var(--nx-muted);
  font-size: 0.94rem;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.nx-drawer a:hover { color: var(--nx-magenta); }

/* Ads */
.nx-ads-fixed {
  position: fixed;
  top: var(--nx-header);
  left: 0; right: 0;
  background: rgba(12, 10, 24, 0.97);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--nx-border);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.26s, visibility 0.26s, transform 0.26s;
  padding: 7px 0;
}

.nx-ads-fixed.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#ads-sticky-inner {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 4px;
}

#ads-sticky-inner > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: calc(12.5% - 4px);
  box-sizing: border-box;
}

#ads-sticky-inner img {
  width: 50px;
  height: 50px;
  object-fit: cover;
  border-radius: 13px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  border: 1px solid var(--nx-border);
}

#ads-sticky-inner .caption {
  height: 13px;
  font-size: 9px;
  color: var(--nx-muted);
  text-align: center;
  max-width: 68px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 2px;
}

.nx-ads-hero {
  padding: calc(var(--nx-header) + 20px) 0 30px;
  background: var(--nx-grad-soft);
}

.nx-ads-tag {
  text-align: center;
  font-size: 0.78rem;
  color: var(--nx-magenta);
  letter-spacing: 0.16em;
  margin-bottom: 14px;
}

#ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px;
}

#ads > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 72px;
}

#ads img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
  border: 1px solid var(--nx-border);
  transition: transform 0.18s, box-shadow 0.18s;
}

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

#ads img:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 10px 28px var(--nx-glow);
}

#ads .caption {
  height: 15px;
  font-size: 11px;
  color: var(--nx-muted);
  text-align: center;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}

/* Hero */
.nx-hero {
  padding: 48px 0 64px;
  position: relative;
}

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

.nx-hero-tag {
  display: inline-block;
  padding: 5px 14px;
  background: rgba(139,92,246,0.15);
  border: 1px solid var(--nx-border);
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--nx-violet);
  letter-spacing: 0.1em;
  margin-bottom: 18px;
}

.nx-hero h1 {
  font-family: var(--nx-font-display);
  font-size: clamp(1.7rem, 4.5vw, 2.5rem);
  line-height: 1.35;
  margin-bottom: 20px;
  background: var(--nx-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nx-hero-lead {
  color: var(--nx-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.nx-hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.nx-chip {
  padding: 6px 14px;
  background: var(--nx-card);
  border: 1px solid var(--nx-border);
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--nx-muted);
}

.nx-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  background: var(--nx-grad);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
}

.nx-btn:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--nx-glow);
}

.nx-btn-ghost {
  background: transparent;
  border: 1px solid var(--nx-border);
  color: var(--nx-text);
  margin-left: 12px;
}

.nx-btn-ghost:hover { color: var(--nx-magenta); border-color: var(--nx-magenta); box-shadow: none; transform: none; }

.nx-phones {
  position: relative;
  height: 420px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.nx-phone {
  position: absolute;
  width: 200px;
  border-radius: 22px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.55), 0 0 0 1px var(--nx-border);
  transition: transform 0.35s;
}

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

.nx-phone:nth-child(2) {
  transform: rotate(2deg) translateY(-15px);
  z-index: 3;
}

.nx-phone:nth-child(3) {
  transform: rotate(10deg) translateX(70px) translateY(20px);
  z-index: 2;
}

.nx-phones:hover .nx-phone:nth-child(1) { transform: rotate(-10deg) translateX(-80px) translateY(5px); }
.nx-phones:hover .nx-phone:nth-child(2) { transform: rotate(0deg) translateY(-25px) scale(1.03); }
.nx-phones:hover .nx-phone:nth-child(3) { transform: rotate(12deg) translateX(80px) translateY(15px); }

/* Sections */
.nx-section { padding: 56px 0; }

.nx-section-alt { background: var(--nx-deep); }

.nx-head {
  text-align: center;
  margin-bottom: 40px;
}

.nx-head h2 {
  font-family: var(--nx-font-display);
  font-size: clamp(1.4rem, 3.5vw, 1.9rem);
  margin-bottom: 10px;
}

.nx-head p { color: var(--nx-muted); font-size: 0.92rem; }

.nx-head-line {
  width: 48px;
  height: 3px;
  background: var(--nx-grad);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* Feature grid */
.nx-feat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.nx-feat {
  background: var(--nx-card);
  border: 1px solid var(--nx-border);
  border-radius: var(--nx-radius);
  padding: 26px 22px;
  position: relative;
  overflow: hidden;
}

.nx-feat::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 4px;
  height: 100%;
  background: var(--nx-grad);
}

.nx-feat-num {
  font-family: var(--nx-font-display);
  font-size: 2rem;
  color: rgba(139,92,246,0.25);
  line-height: 1;
  margin-bottom: 10px;
}

.nx-feat h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--nx-text);
}

.nx-feat p { font-size: 0.88rem; color: var(--nx-muted); line-height: 1.75; }

/* Split content 3:7 */
.nx-split {
  display: grid;
  grid-template-columns: 3fr 7fr;
  gap: 32px;
  align-items: start;
  margin-bottom: 40px;
}

.nx-split.reverse { grid-template-columns: 7fr 3fr; }
.nx-split.reverse .nx-split-img { order: 2; }

.nx-split-img img {
  border-radius: var(--nx-radius);
  box-shadow: 0 12px 36px rgba(0,0,0,0.4);
  border: 1px solid var(--nx-border);
}

.nx-split-body h3 {
  font-family: var(--nx-font-display);
  font-size: 1.2rem;
  margin-bottom: 14px;
  color: var(--nx-text);
}

.nx-split-body p {
  font-size: 0.9rem;
  color: var(--nx-muted);
  margin-bottom: 12px;
}

/* Stats */
.nx-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 40px 0;
}

.nx-stat {
  text-align: center;
  padding: 22px 12px;
  background: var(--nx-card);
  border: 1px solid var(--nx-border);
  border-radius: var(--nx-radius);
}

.nx-stat strong {
  display: block;
  font-size: 1.6rem;
  background: var(--nx-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.nx-stat span { font-size: 0.82rem; color: var(--nx-muted); }

/* Steps */
.nx-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.nx-step {
  background: var(--nx-card);
  border: 1px solid var(--nx-border);
  border-radius: var(--nx-radius);
  padding: 28px 22px;
  text-align: center;
}

.nx-step-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 14px;
  background: var(--nx-grad);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

.nx-step h3 { font-size: 1rem; margin-bottom: 10px; }
.nx-step p { font-size: 0.86rem; color: var(--nx-muted); }

/* FAQ */
.nx-faq { max-width: 760px; margin: 0 auto; }

.nx-faq-item {
  border: 1px solid var(--nx-border);
  border-radius: var(--nx-radius);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--nx-card);
}

.nx-faq-q {
  width: 100%;
  text-align: left;
  padding: 16px 20px;
  background: none;
  border: none;
  color: var(--nx-text);
  font-size: 0.92rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

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

.nx-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.nx-faq-item.open .nx-faq-a { max-height: 300px; }

.nx-faq-a-inner {
  padding: 0 20px 16px;
  font-size: 0.88rem;
  color: var(--nx-muted);
  line-height: 1.75;
}

/* Text SEO modules */
.nx-text-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.nx-text-card {
  background: var(--nx-card);
  border: 1px solid var(--nx-border);
  border-radius: var(--nx-radius);
  padding: 26px 24px;
}

.nx-text-card h3 {
  font-family: var(--nx-font-display);
  font-size: 1.05rem;
  margin-bottom: 12px;
  color: var(--nx-text);
}

.nx-text-card p {
  font-size: 0.88rem;
  color: var(--nx-muted);
  line-height: 1.8;
}

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

.nx-prose-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
}

.nx-prose-col h3 {
  font-family: var(--nx-font-display);
  font-size: 1.05rem;
  margin: 0 0 10px;
  color: var(--nx-text);
}

.nx-prose-col h3:not(:first-child) { margin-top: 24px; }

.nx-prose-col p {
  font-size: 0.88rem;
  color: var(--nx-muted);
  line-height: 1.85;
  margin-bottom: 8px;
}

/* Prose (sub pages) */
.nx-breadcrumb {
  padding: calc(var(--nx-header) + 24px) 0 0;
  font-size: 0.82rem;
  color: var(--nx-muted);
}

.nx-breadcrumb a { color: var(--nx-muted); }
.nx-breadcrumb a:hover { color: var(--nx-magenta); }
.nx-breadcrumb span { color: var(--nx-text); }

.nx-prose {
  padding: 28px 0 64px;
  max-width: 820px;
}

.nx-prose h1 {
  font-family: var(--nx-font-display);
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.nx-prose h2 {
  font-family: var(--nx-font-display);
  font-size: 1.25rem;
  margin: 28px 0 12px;
  color: var(--nx-text);
}

.nx-prose p, .nx-prose li {
  font-size: 0.9rem;
  color: var(--nx-muted);
  margin-bottom: 12px;
}

.nx-prose ul { padding-left: 22px; margin-bottom: 16px; }

/* Error pages */
.nx-error {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nx-header) + 40px) 20px 60px;
}

.nx-error-code {
  font-size: 5rem;
  font-family: var(--nx-font-display);
  background: var(--nx-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.nx-error h1 { font-size: 1.4rem; margin: 16px 0 10px; }
.nx-error p { color: var(--nx-muted); margin-bottom: 24px; font-size: 0.92rem; }

/* Footer */
.nx-footer {
  background: var(--nx-deep);
  border-top: 1px solid var(--nx-border);
  padding: 48px 0 24px;
}

.nx-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.nx-footer-brand img { margin-bottom: 14px; border-radius: 10px; }

.nx-footer-brand p {
  font-size: 0.84rem;
  color: var(--nx-muted);
  line-height: 1.7;
}

.nx-footer-col h4 {
  font-size: 0.88rem;
  margin-bottom: 14px;
  color: var(--nx-text);
}

.nx-footer-col a {
  display: block;
  font-size: 0.84rem;
  color: var(--nx-muted);
  margin-bottom: 8px;
}

.nx-footer-col a:hover { color: var(--nx-magenta); }

.nx-footer-bar {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 20px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--nx-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .nx-hero-grid { grid-template-columns: 1fr; }
  .nx-phones { height: 340px; margin-top: 20px; }
  .nx-phone { width: 160px; }
  .nx-feat-grid { grid-template-columns: 1fr 1fr; }
  .nx-split, .nx-split.reverse { grid-template-columns: 1fr; }
  .nx-split.reverse .nx-split-img { order: 0; }
  .nx-stats { grid-template-columns: repeat(2, 1fr); }
  .nx-steps { grid-template-columns: 1fr; }
  .nx-footer-grid { grid-template-columns: 1fr; }
  #ads-sticky-inner > div { width: calc(25% - 4px); }
  .nx-text-grid { grid-template-columns: 1fr; }
  .nx-prose-columns { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nx-nav { display: none; }
  .nx-toggle { display: flex; }
  .nx-feat-grid { grid-template-columns: 1fr; }
  .nx-btn-ghost { margin-left: 0; margin-top: 10px; display: inline-flex; }
  .nx-phone { width: 130px; }
  .nx-phones { height: 280px; }
  .nx-phone:nth-child(1) { transform: rotate(-6deg) translateX(-50px); }
  .nx-phone:nth-child(3) { transform: rotate(8deg) translateX(50px); }
}