/* 91POAPP官方站 — 赤墨缎夜·橙焰流光 */
:root {
  --nv-void: #070605;
  --nv-deep: #0f0c0a;
  --nv-panel: #161210;
  --nv-card: #1e1915;
  --nv-line: rgba(255, 106, 0, 0.14);
  --nv-text: #f8f0e8;
  --nv-muted: #9a9088;
  --nv-orange: #ff6a00;
  --nv-flame: #ff8534;
  --nv-crimson: #e6396a;
  --nv-wine: #8b2252;
  --nv-glow: rgba(255, 106, 0, 0.26);
  --nv-grad: linear-gradient(120deg, #ff6a00 0%, #e6396a 55%, #8b2252 100%);
  --nv-grad-dim: linear-gradient(180deg, rgba(255,106,0,0.09) 0%, transparent 72%);
  --nv-radius: 16px;
  --nv-header: 54px;
  --nv-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

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

body {
  font-family: var(--nv-font);
  background: var(--nv-void);
  color: var(--nv-text);
  line-height: 1.88;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 55% 42% at 92% 4%, rgba(230,57,106,0.09) 0%, transparent 52%),
    radial-gradient(ellipse 48% 38% at 4% 92%, rgba(255,106,0,0.07) 0%, transparent 48%),
    radial-gradient(ellipse 30% 25% at 48% 42%, rgba(139,34,82,0.04) 0%, transparent 58%);
  pointer-events: none;
  z-index: 0;
}

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

a { color: var(--nv-flame); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--nv-crimson); }

.nv-wrap { width: min(1080px, 92vw); margin: 0 auto; position: relative; z-index: 1; }

/* Header */
.nv-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nv-header);
  background: rgba(7, 6, 5, 0.95);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--nv-line);
  z-index: 1000;
}

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

.nv-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--nv-text);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.nv-brand img {
  border-radius: 9px;
  box-shadow: 0 0 16px var(--nv-glow);
}

.nv-nav { display: flex; gap: 18px; }

.nv-nav a {
  color: var(--nv-muted);
  font-size: 0.83rem;
  padding: 4px 0;
  position: relative;
}

.nv-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--nv-grad);
  transition: width 0.22s;
  border-radius: 2px;
}

.nv-nav a:hover,
.nv-nav a.is-on { color: var(--nv-text); }
.nv-nav a:hover::after,
.nv-nav a.is-on::after { width: 100%; }

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

.nv-toggle span {
  display: block;
  width: 21px;
  height: 2px;
  background: var(--nv-orange);
  border-radius: 2px;
}

.nv-drawer {
  position: fixed;
  top: var(--nv-header);
  right: -100%;
  width: min(270px, 78vw);
  height: calc(100vh - var(--nv-header));
  background: rgba(15, 12, 10, 0.98);
  backdrop-filter: blur(14px);
  border-left: 1px solid var(--nv-line);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  z-index: 999;
  transition: right 0.28s ease;
}

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

.nv-drawer a {
  color: var(--nv-muted);
  font-size: 0.9rem;
  padding: 11px 6px;
  border-bottom: 1px solid rgba(255,106,0,0.05);
}

.nv-drawer a:hover { color: var(--nv-flame); }

/* Sticky Ads */
.nv-ads-fixed {
  position: fixed;
  top: var(--nv-header);
  left: 0; right: 0;
  background: rgba(15, 12, 10, 0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--nv-line);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-5px);
  transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
  padding: 6px 0;
}

.nv-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: 3px;
}

#ads-sticky-inner > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: calc(12.5% - 3px);
  box-sizing: border-box;
}

#ads-sticky-inner img {
  width: 44px;
  height: 44px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 3px 12px rgba(0,0,0,0.45);
  border: 1px solid var(--nv-line);
}

#ads-sticky-inner .caption {
  height: 11px;
  font-size: 9px;
  color: var(--nv-muted);
  text-align: center;
  max-width: 60px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 2px;
}

/* Top Ads */
.nv-ads-top {
  padding: calc(var(--nv-header) + 18px) 0 28px;
  background: var(--nv-grad-dim);
}

.nv-ads-label {
  text-align: center;
  font-size: 0.72rem;
  color: var(--nv-orange);
  letter-spacing: 0.2em;
  margin-bottom: 12px;
}

#ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px;
}

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

#ads img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 17px;
  box-shadow: 0 5px 18px rgba(0,0,0,0.38);
  transition: transform 180ms ease, box-shadow 180ms ease;
  border: 1px solid var(--nv-line);
}

#ads a { display: inline-block; border-radius: 15px; }

#ads img:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 10px 26px rgba(255,106,0,0.22);
}

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

/* Hero */
.nv-hero {
  padding: 36px 0 58px;
}

.nv-hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 36px;
  align-items: center;
}

.nv-hero-stack {
  position: relative;
  height: 370px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.nv-hero-stack img {
  position: absolute;
  width: 152px;
  border-radius: 20px;
  border: 2px solid rgba(255,106,0,0.22);
  box-shadow: 0 18px 46px rgba(0,0,0,0.52);
  transition: transform 0.32s ease;
}

.nv-hero-stack img:nth-child(1) {
  transform: rotate(-11deg) translateX(-68px) translateY(12px);
  z-index: 1;
}

.nv-hero-stack img:nth-child(2) {
  transform: translateY(-6px);
  z-index: 3;
  width: 168px;
}

.nv-hero-stack img:nth-child(3) {
  transform: rotate(11deg) translateX(68px) translateY(16px);
  z-index: 2;
}

.nv-hero-stack:hover img:nth-child(1) { transform: rotate(-13deg) translateX(-76px) translateY(8px); }
.nv-hero-stack:hover img:nth-child(2) { transform: translateY(-12px) scale(1.02); }
.nv-hero-stack:hover img:nth-child(3) { transform: rotate(13deg) translateX(76px) translateY(12px); }

.nv-hero-copy h1 {
  font-size: clamp(1.45rem, 4vw, 2.05rem);
  line-height: 1.38;
  margin-bottom: 16px;
  background: var(--nv-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nv-hero-desc {
  color: var(--nv-muted);
  font-size: 0.92rem;
  margin-bottom: 20px;
}

.nv-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.nv-pill {
  font-size: 0.7rem;
  padding: 4px 13px;
  border-radius: 18px;
  border: 1px solid var(--nv-line);
  color: var(--nv-flame);
  background: rgba(255,106,0,0.05);
  letter-spacing: 0.05em;
}

/* Sections */
.nv-block {
  padding: 48px 0;
  border-top: 1px solid rgba(255,106,0,0.05);
}

.nv-block-head {
  margin-bottom: 32px;
  max-width: 700px;
}

.nv-block-head h2 {
  font-size: clamp(1.2rem, 2.8vw, 1.58rem);
  margin-bottom: 10px;
  padding-left: 14px;
  border-left: 3px solid var(--nv-orange);
  color: var(--nv-text);
}

.nv-block-head p {
  color: var(--nv-muted);
  font-size: 0.88rem;
  padding-left: 17px;
}

.nv-block-head.center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.nv-block-head.center h2 {
  border-left: none;
  padding-left: 0;
}

.nv-block-head.center p { padding-left: 0; }

/* 3:7 media row */
.nv-media-row {
  display: grid;
  grid-template-columns: 3fr 7fr;
  gap: 28px;
  align-items: center;
  margin-bottom: 44px;
}

.nv-media-row.flip { direction: rtl; }
.nv-media-row.flip > * { direction: ltr; }

.nv-media-shot {
  position: relative;
}

.nv-media-shot img {
  border-radius: var(--nv-radius);
  border: 1px solid var(--nv-line);
  box-shadow: 0 14px 36px rgba(0,0,0,0.38);
}

.nv-media-shot::before {
  content: "";
  position: absolute;
  top: -6px; left: -6px;
  width: 40%; height: 40%;
  border-top: 2px solid var(--nv-orange);
  border-left: 2px solid var(--nv-orange);
  border-radius: var(--nv-radius) 0 0 0;
  opacity: 0.5;
  pointer-events: none;
}

.nv-media-text h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--nv-flame);
}

.nv-media-text p {
  color: var(--nv-muted);
  font-size: 0.88rem;
  margin-bottom: 10px;
}

.nv-media-text ul {
  list-style: none;
  margin-top: 12px;
}

.nv-media-text li {
  color: var(--nv-muted);
  font-size: 0.84rem;
  padding: 5px 0 5px 16px;
  position: relative;
}

.nv-media-text li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--nv-crimson);
  font-size: 0.7rem;
  top: 8px;
}

/* Cards */
.nv-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 24px 0;
}

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

.nv-card h3 {
  font-size: 1rem;
  color: var(--nv-orange);
  margin-bottom: 10px;
}

.nv-card p {
  color: var(--nv-muted);
  font-size: 0.86rem;
  margin-bottom: 8px;
}

.nv-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 30px 0;
}

.nv-metric {
  text-align: center;
  padding: 20px 10px;
  background: var(--nv-panel);
  border: 1px solid var(--nv-line);
  border-radius: var(--nv-radius);
}

.nv-metric b {
  display: block;
  font-size: 1.4rem;
  background: var(--nv-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}

.nv-metric span {
  font-size: 0.76rem;
  color: var(--nv-muted);
}

.nv-para {
  color: var(--nv-muted);
  font-size: 0.88rem;
  margin-bottom: 16px;
}

.nv-card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.nv-seo-wide {
  background: var(--nv-panel);
  border: 1px solid var(--nv-line);
  border-radius: var(--nv-radius);
  padding: 28px 30px;
  margin-bottom: 22px;
}

.nv-seo-wide h3 {
  font-size: 1.05rem;
  color: var(--nv-flame);
  margin-bottom: 12px;
}

.nv-seo-wide p {
  color: var(--nv-muted);
  font-size: 0.87rem;
  margin-bottom: 10px;
}

.nv-compare-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 14px;
}

.nv-compare-item {
  padding: 18px 20px;
  border-radius: var(--nv-radius);
  border: 1px solid var(--nv-line);
  background: var(--nv-card);
}

.nv-compare-item.official { border-color: rgba(255,106,0,0.28); }

.nv-compare-item h4 {
  font-size: 0.88rem;
  margin-bottom: 8px;
  color: var(--nv-text);
}

.nv-compare-item.official h4 { color: var(--nv-orange); }

.nv-compare-item p {
  font-size: 0.82rem;
  color: var(--nv-muted);
  margin: 0;
}

.nv-list-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
  margin: 16px 0;
}

.nv-list-cols li {
  color: var(--nv-muted);
  font-size: 0.84rem;
  padding: 4px 0 4px 14px;
  position: relative;
  list-style: none;
}

.nv-list-cols li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--nv-orange);
  font-size: 0.7rem;
}

/* CTA */
.nv-cta {
  display: inline-block;
  padding: 11px 26px;
  background: var(--nv-grad);
  color: #fff;
  border-radius: 22px;
  font-size: 0.86rem;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
  letter-spacing: 0.03em;
}

.nv-cta:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 7px 22px var(--nv-glow);
}

/* FAQ */
.nv-faq { max-width: 740px; margin: 0 auto; }

.nv-faq-item {
  border: 1px solid var(--nv-line);
  border-radius: var(--nv-radius);
  margin-bottom: 9px;
  overflow: hidden;
  background: var(--nv-panel);
}

.nv-faq-q {
  width: 100%;
  text-align: left;
  padding: 15px 18px;
  background: none;
  border: none;
  color: var(--nv-text);
  font-size: 0.88rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nv-faq-q::after {
  content: "+";
  color: var(--nv-orange);
  font-size: 1.15rem;
  transition: transform 0.22s;
}

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

.nv-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.28s ease;
}

.nv-faq-item.open .nv-faq-a { max-height: 400px; }

.nv-faq-a p {
  padding: 0 18px 14px;
  color: var(--nv-muted);
  font-size: 0.84rem;
}

/* Breadcrumb */
.nv-crumb {
  padding: 18px 0 6px;
  font-size: 0.8rem;
  color: var(--nv-muted);
}

.nv-crumb a { color: var(--nv-flame); }

/* Prose */
.nv-prose {
  padding: 20px 0 56px;
  max-width: 780px;
}

.nv-prose h1 {
  font-size: 1.55rem;
  margin-bottom: 18px;
}

.nv-prose h2 {
  font-size: 1.1rem;
  margin: 26px 0 10px;
  color: var(--nv-flame);
}

.nv-prose p, .nv-prose li {
  color: var(--nv-muted);
  font-size: 0.88rem;
  margin-bottom: 11px;
}

.nv-prose ul { padding-left: 18px; margin-bottom: 14px; }

/* Error */
.nv-error {
  text-align: center;
  padding: 70px 0 90px;
}

.nv-error-code {
  font-size: 5rem;
  font-weight: 800;
  line-height: 1;
  background: var(--nv-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

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

.nv-error p {
  color: var(--nv-muted);
  margin-bottom: 24px;
  font-size: 0.9rem;
}

.nv-btn-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.nv-btn-ghost {
  display: inline-block;
  padding: 10px 24px;
  border: 1px solid var(--nv-line);
  border-radius: 22px;
  color: var(--nv-muted);
  font-size: 0.84rem;
}

.nv-btn-ghost:hover { color: var(--nv-flame); border-color: var(--nv-orange); }

/* Footer */
.nv-footer {
  border-top: 1px solid var(--nv-line);
  padding: 36px 0 28px;
  margin-top: 16px;
}

.nv-footer-cols {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 24px;
}

.nv-footer h4 {
  font-size: 0.86rem;
  margin-bottom: 12px;
}

.nv-footer p, .nv-footer a {
  font-size: 0.78rem;
  color: var(--nv-muted);
  display: block;
  margin-bottom: 7px;
}

.nv-footer a:hover { color: var(--nv-flame); }

.nv-footer-copy {
  text-align: center;
  font-size: 0.73rem;
  color: var(--nv-muted);
  padding-top: 18px;
  border-top: 1px solid rgba(255,106,0,0.05);
  opacity: 0.65;
}

/* Responsive */
@media (max-width: 900px) {
  .nv-hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .nv-hero-stack { height: 310px; }
  .nv-hero-stack img { width: 128px; }
  .nv-hero-stack img:nth-child(2) { width: 142px; }
  .nv-media-row { grid-template-columns: 1fr; gap: 18px; }
  .nv-media-row.flip { direction: ltr; }
  .nv-card-grid { grid-template-columns: 1fr; }
  .nv-card-grid-3 { grid-template-columns: 1fr; }
  .nv-compare-row { grid-template-columns: 1fr; }
  .nv-list-cols { grid-template-columns: 1fr; }
  .nv-metrics { grid-template-columns: repeat(2, 1fr); }
  .nv-footer-cols { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 768px) {
  .nv-nav { display: none; }
  .nv-toggle { display: flex; }
  #ads-sticky-inner > div { width: calc(25% - 3px); }
  #ads-sticky-inner img { width: 40px; height: 40px; }
  .nv-hero-stack img:nth-child(1) { transform: rotate(-9deg) translateX(-48px); }
  .nv-hero-stack img:nth-child(3) { transform: rotate(9deg) translateX(48px); }
}

@media (max-width: 480px) {
  .nv-hero-stack { height: 270px; }
  .nv-hero-stack img { width: 108px; }
  .nv-hero-stack img:nth-child(2) { width: 122px; }
}