/* dy-s.lol — Chromatic Noir · 霓虹暗色官方风 · 移动端优先 */
:root {
  --void: #000000;
  --ink: #0a0a0f;
  --panel: #111118;
  --panel-2: #18181f;
  --line: rgba(255, 255, 255, 0.07);
  --line-glow: rgba(0, 242, 234, 0.25);
  --snow: #f8f8fc;
  --mist: #a8a8b8;
  --fog: #686878;
  --cyan: #00f2ea;
  --magenta: #fe2c55;
  --gold: #f5c842;
  --grad-chroma: linear-gradient(135deg, var(--cyan) 0%, var(--magenta) 100%);
  --grad-mesh: radial-gradient(ellipse 80% 60% at 20% 10%, rgba(0, 242, 234, 0.14), transparent 55%),
               radial-gradient(ellipse 70% 50% at 80% 30%, rgba(254, 44, 85, 0.12), transparent 50%),
               radial-gradient(ellipse 60% 40% at 50% 90%, rgba(0, 242, 234, 0.06), transparent 45%);
  --nav-h: 52px;
  --sticky-h: 88px;
  --radius: 14px;
  --radius-xl: 24px;
  --font: "Outfit", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::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(--void);
  color: var(--snow);
  line-height: 1.85;
  font-size: 15px;
  overflow-x: hidden;
  min-height: 100vh;
}

body.nav-open { overflow: hidden; }

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

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

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

.shell {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ── Topbar ── */
.head-group {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 960;
  height: var(--nav-h);
  background: rgba(0, 0, 0, 0.88);
  border-bottom: 1px solid var(--line);
}

.head-group::after {
  content: "";
  position: absolute;
  inset: 0;
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  z-index: -1;
  pointer-events: none;
}

.topbar {
  position: static;
  height: 100%;
  background: none;
  border: none;
}

.topbar::after { display: none; }

.head-group__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.brand img { height: 28px; width: auto; }

.menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  position: relative;
  z-index: 970;
  flex-shrink: 0;
}

.menu-btn span {
  display: block;
  height: 2px;
  background: var(--snow);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.menu-btn.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn.active span:nth-child(2) { opacity: 0; }
.menu-btn.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-drawer {
  position: fixed;
  top: var(--nav-h);
  right: 0;
  bottom: 0;
  width: min(280px, 85vw);
  background: var(--ink);
  border-left: 1px solid var(--line);
  transform: translateX(100%);
  transition: transform 0.35s var(--ease);
  z-index: 950;
  padding: 20px 0;
  overflow-y: auto;
  visibility: hidden;
}

.nav-drawer.open {
  transform: translateX(0);
  visibility: visible;
}

.nav-drawer a {
  display: block;
  padding: 14px 24px;
  color: var(--mist);
  font-size: 15px;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all 0.2s;
}

.nav-drawer a:hover,
.nav-drawer a.is-on {
  color: var(--snow);
  background: rgba(0, 242, 234, 0.05);
  border-left-color: var(--cyan);
}

.nav-drawer .dl-link {
  margin: 12px 20px 0;
  display: block;
  text-align: center;
  padding: 12px;
  background: var(--grad-chroma);
  color: #000 !important;
  font-weight: 700;
  border-radius: 999px;
  border: none;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  top: var(--nav-h);
  background: rgba(0, 0, 0, 0.65);
  z-index: 940;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  visibility: hidden;
}

body.nav-open .nav-overlay {
  visibility: visible;
}

body.nav-open .nav-overlay {
  opacity: 1;
  pointer-events: auto;
}

/* ── Sticky download bar ── */
.dl-sticky {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 880;
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transform: translateY(-110%);
  opacity: 0;
  transition: transform 0.35s var(--ease), opacity 0.35s;
  pointer-events: none;
}

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

.dl-sticky__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 8px 12px;
}

#sticky-ads {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
  gap: 6px 4px;
}

#sticky-ads .ad-item {
  width: calc(25% - 3px);
  min-width: 68px;
  max-width: 90px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#sticky-ads img {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--line);
}

#sticky-ads .caption {
  font-size: 10px;
  color: var(--fog);
  text-align: center;
  margin-top: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

/* ── Ads zone ── */
.dl-zone {
  padding: calc(var(--nav-h) + 12px) 0 8px;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

#ads {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
  gap: 8px 6px;
  background: transparent;
}

#ads .ad-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: calc(25% - 5px);
  min-width: 72px;
  max-width: 96px;
}

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

#ads a:hover img {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 10px 24px rgba(0, 242, 234, 0.15);
}

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

/* ── Hero ── */
.hero {
  position: relative;
  padding: 36px 0 48px;
  background: var(--void);
  background-image: var(--grad-mesh);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(255, 255, 255, 0.015) 2px,
    rgba(255, 255, 255, 0.015) 4px
  );
  pointer-events: none;
}

.hero__inner { position: relative; z-index: 1; }

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-glow);
  background: rgba(0, 242, 234, 0.06);
  font-size: 12px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.06em;
  margin-bottom: 18px;
}

.hero__tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(1.65rem, 6vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.hero h1 .chroma {
  background: var(--grad-chroma);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__lead {
  font-size: 15px;
  color: var(--mist);
  max-width: 640px;
  margin-bottom: 24px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:active { transform: scale(0.97); }

.btn--primary {
  background: var(--grad-chroma);
  color: #000;
  box-shadow: 0 4px 24px rgba(254, 44, 85, 0.3);
}

.btn--primary:hover {
  color: #000;
  box-shadow: 0 6px 32px rgba(0, 242, 234, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--snow);
  border: 1px solid var(--line);
}

.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

/* ── Metrics strip ── */
.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 32px 0;
}

.metric {
  background: var(--panel);
  padding: 16px 10px;
  text-align: center;
}

.metric strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  background: var(--grad-chroma);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.metric span {
  font-size: 11px;
  color: var(--fog);
  margin-top: 4px;
  display: block;
}

/* ── Content blocks 3:7 ratio ── */
.section-head {
  margin: 40px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.section-head h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--snow);
}

.section-head p {
  font-size: 13px;
  color: var(--fog);
  margin-top: 4px;
}

.block {
  display: grid;
  grid-template-columns: 3fr 7fr;
  gap: 16px;
  align-items: start;
  margin-bottom: 28px;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  transition: border-color 0.3s;
}

.block:hover { border-color: var(--line-glow); }

.block__text h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--snow);
}

.block__text p {
  font-size: 13.5px;
  color: var(--mist);
  line-height: 1.75;
}

.block__text .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.block__text .tag {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(254, 44, 85, 0.12);
  color: var(--magenta);
  border: 1px solid rgba(254, 44, 85, 0.2);
}

.block__img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

.block__img img { width: 100%; }

.block--flip .block__text { order: 2; }
.block--flip .block__img { order: 1; }

/* ── Prose sections ── */
.prose {
  padding: 8px 0 32px;
}

.prose h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--snow);
}

.prose h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 24px 0 10px;
  color: var(--cyan);
}

.prose p {
  font-size: 14px;
  color: var(--mist);
  margin-bottom: 14px;
  text-align: justify;
}

.prose ul, .prose ol {
  margin: 0 0 14px 18px;
  color: var(--mist);
  font-size: 14px;
}

.prose li { margin-bottom: 6px; }

.prose a { text-decoration: underline; text-underline-offset: 3px; }

/* ── Gallery row ── */
.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 24px 0;
}

.gallery__item {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  position: relative;
}

.gallery__item figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 8px 10px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
  font-size: 11px;
  color: var(--snow);
}

/* ── FAQ ── */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--panel);
}

.faq-item summary {
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  font-size: 18px;
  color: var(--cyan);
  transition: transform 0.2s;
}

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

.faq-item p {
  padding: 0 16px 14px;
  font-size: 13px;
  color: var(--mist);
}

/* ── CTA band ── */
.cta-band {
  margin: 40px 0;
  padding: 32px 24px;
  border-radius: var(--radius-xl);
  background: var(--panel-2);
  border: 1px solid var(--line-glow);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--grad-mesh);
  opacity: 0.5;
}

.cta-band > * { position: relative; z-index: 1; }

.cta-band h2 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.cta-band p {
  font-size: 13px;
  color: var(--mist);
  margin-bottom: 18px;
}

/* ── Footer ── */
.site-foot {
  margin-top: 48px;
  padding: 32px 0 24px;
  border-top: 1px solid var(--line);
  background: var(--ink);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

.foot-brand img { height: 24px; margin-bottom: 10px; }

.foot-brand p {
  font-size: 12px;
  color: var(--fog);
  line-height: 1.7;
}

.foot-links h4 {
  font-size: 12px;
  font-weight: 700;
  color: var(--mist);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.foot-links a {
  display: block;
  font-size: 13px;
  color: var(--fog);
  padding: 4px 0;
}

.foot-links a:hover { color: var(--cyan); }

.foot-copy {
  text-align: center;
  font-size: 11px;
  color: var(--fog);
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

/* ── Sub pages ── */
.page-hero {
  padding: calc(var(--nav-h) + 28px) 0 24px;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  font-size: 1.5rem;
  font-weight: 800;
}

.page-hero p {
  font-size: 13px;
  color: var(--fog);
  margin-top: 6px;
}

.page-body {
  padding: 28px 0 48px;
}

.page-body .prose h2 { font-size: 1.1rem; }

/* ── Error pages ── */
.err-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.err-code {
  font-size: 5rem;
  font-weight: 900;
  line-height: 1;
  background: var(--grad-chroma);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.err-main h1 {
  font-size: 1.3rem;
  margin: 12px 0 8px;
}

.err-main p {
  font-size: 14px;
  color: var(--mist);
  max-width: 360px;
  margin-bottom: 20px;
}

/* ── SEO text panels ── */
.seo-panel {
  margin: 36px 0;
  padding: 28px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
}

.seo-panel h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.seo-panel h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--cyan);
  margin: 22px 0 10px;
}

.seo-panel p {
  font-size: 14px;
  color: var(--mist);
  margin-bottom: 12px;
  text-align: justify;
}

.seo-panel ul {
  margin: 0 0 14px 18px;
  font-size: 14px;
  color: var(--mist);
}

.seo-panel li { margin-bottom: 6px; }

.seo-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 20px;
}

.seo-col {
  padding: 16px;
  background: var(--panel-2);
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.seo-col h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--snow);
}

.seo-col p {
  font-size: 13px;
  margin-bottom: 0;
}

/* ── Desktop ── */
@media (min-width: 768px) {
  .menu-btn { display: none; }

  .nav-overlay { display: none !important; }

  .nav-drawer {
    position: static;
    width: auto;
    height: auto;
    background: none;
    border: none;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 4px;
    overflow: visible;
    transform: none;
    visibility: visible;
    flex-shrink: 0;
  }

  .nav-drawer a {
    padding: 6px 12px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
  }

  .nav-drawer a:hover,
  .nav-drawer a.is-on {
    background: rgba(255, 255, 255, 0.06);
    border-left: none;
  }

  .nav-drawer .dl-link {
    margin: 0 0 0 8px;
    padding: 8px 18px;
    font-size: 13px;
  }

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

  .foot-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }

  .gallery {
    grid-template-columns: repeat(4, 1fr);
  }

  @media (min-width: 768px) and (max-width: 900px) {
    .gallery {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  #ads .ad-item,
  #sticky-ads .ad-item {
    width: 80px;
    max-width: 80px;
  }
}

@media (max-width: 600px) {
  .block {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .block--flip .block__text { order: unset; }
  .block--flip .block__img { order: unset; }

  .block__text { margin-bottom: 4px; }
}