:root {
  --bg: #0f1115;
  --bg-soft: #171a21;
  --bg-card: #1c212b;
  --line: #2a3140;
  --text: #e8ecf4;
  --muted: #9aa3b5;
  --brand: #f0a04b;
  --brand-deep: #d9842f;
  --brand-soft: rgba(240, 160, 75, 0.14);
  --ok: #4ade80;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --max: 1120px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(240, 160, 75, 0.16), transparent 60%),
    radial-gradient(900px 400px at 90% 0%, rgba(80, 120, 200, 0.12), transparent 55%),
    var(--bg);
  line-height: 1.75;
  min-height: 100vh;
}

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

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  color: #ffc078;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(15, 17, 21, 0.86);
  border-bottom: 1px solid var(--line);
}

.ads-sticky {
  position: sticky;
  top: 68px;
  z-index: 49;
  backdrop-filter: blur(14px);
  background: rgba(15, 17, 21, 0.94);
  border-bottom: 1px solid var(--line);
  padding: 8px 0 6px;
}

.page-scroll {
  display: block;
}

#ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 4px 2px;
  background: transparent;
  margin: 0;
  padding: 0 8px;
}

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

#ads figure {
  margin: 0;
}

#ads img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
  transition: transform 180ms ease, box-shadow 180ms ease;
  display: block;
  border: none;
  background: #fff;
}

#ads a {
  display: inline-block;
  text-decoration: none;
  border-radius: 15px;
  color: inherit;
}

#ads img:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
}

#ads figcaption,
#ads .caption {
  height: 15px;
  margin-top: 4px;
  font-size: 11px;
  color: #9aa3b5;
  text-align: center;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.brand span {
  font-size: 1.15rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav a {
  color: var(--muted);
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.active {
  color: var(--text);
  background: var(--brand-soft);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--text);
  border-radius: 10px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  position: relative;
}

.menu-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  position: relative;
  transition: background 0.2s ease;
}

.menu-toggle-bar::before,
.menu-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.2s ease;
}

.menu-toggle-bar::before {
  top: -6px;
}

.menu-toggle-bar::after {
  top: 6px;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bar {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bar::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bar::after {
  transform: translateY(-6px) rotate(-45deg);
}

.hero {
  padding: 3.2rem 0 2.2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--brand);
  background: var(--brand-soft);
  border: 1px solid rgba(240, 160, 75, 0.28);
  border-radius: 999px;
  padding: 0.28rem 0.75rem;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.hero-lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1.4rem;
  max-width: 36rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 12px;
  padding: 0.78rem 1.2rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #1a1208;
}

.btn-primary:hover {
  filter: brightness(1.06);
  color: #1a1208;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}

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

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-meta strong {
  color: var(--ok);
  font-weight: 600;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: auto -8% -10% 20%;
  height: 40%;
  background: radial-gradient(circle, rgba(240, 160, 75, 0.28), transparent 70%);
  z-index: -1;
  filter: blur(10px);
}

.section {
  padding: 2.6rem 0;
}

.section-head {
  margin-bottom: 1.4rem;
}

.section-head h2 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 46rem;
}

.panel {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}

.prose p {
  margin: 0 0 1rem;
  color: #c9d0de;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose h3 {
  margin: 1.6rem 0 0.7rem;
  font-size: 1.2rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: #c9d0de;
}

.prose li {
  margin-bottom: 0.45rem;
}

.feature-grid,
.shot-grid,
.help-grid,
.category-grid {
  display: grid;
  gap: 1rem;
}

.feature-grid {
  grid-template-columns: repeat(3, 1fr);
}

.feature-card,
.help-card,
.category-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
}

.feature-card h3,
.help-card h3,
.category-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.08rem;
}

.feature-card p,
.help-card p,
.category-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.shot-grid {
  grid-template-columns: repeat(3, 1fr);
}

.shot-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.shot-card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  background: #10141c;
}

.shot-card figcaption {
  padding: 0.85rem 0.95rem 1rem;
}

.shot-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.shot-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

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

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  align-items: start;
}

.split img {
  border-radius: 14px;
  border: 1px solid var(--line);
}

.steps {
  counter-reset: step;
  display: grid;
  gap: 0.9rem;
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--brand-soft);
  color: var(--brand);
  font-weight: 700;
}

.step h3 {
  margin: 0 0 0.3rem;
  font-size: 1.02rem;
}

.step p {
  margin: 0;
  color: var(--muted);
}

.faq details {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem 1rem;
  margin-bottom: 0.7rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq p {
  margin: 0.7rem 0 0;
  color: var(--muted);
}

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

.page-hero {
  padding: 2.4rem 0 1.2rem;
}

.page-hero h1 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 42rem;
}

.legal {
  padding-bottom: 3rem;
}

.legal .panel {
  padding: 1.5rem 1.6rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb a:hover {
  color: var(--brand);
}

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: #0c0e12;
  padding: 2rem 0 1.4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.4rem;
}

.site-footer h3 {
  margin: 0 0 0.7rem;
  font-size: 1rem;
}

.site-footer p,
.site-footer a {
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer a {
  display: block;
  margin-bottom: 0.4rem;
}

.site-footer a:hover {
  color: var(--brand);
}

.copyright {
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: #7d8698;
  font-size: 0.85rem;
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 3rem 1rem;
}

.error-page h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2rem, 6vw, 3.4rem);
  color: var(--brand);
}

.error-page p {
  color: var(--muted);
  margin: 0 0 1.3rem;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0 1.5rem;
}

.toc a {
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-size: 0.88rem;
}

.toc a:hover {
  color: var(--brand);
  border-color: rgba(240, 160, 75, 0.4);
}

.pc-only {
  display: block;
}

.mobile-only {
  display: none;
}

@media (max-width: 960px) {
  .hero-grid,
  .split,
  .footer-grid,
  .feature-grid,
  .help-grid {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 760px) {
  html,
  body {
    height: 100%;
    height: 100dvh;
    overflow: hidden;
  }

  body {
    display: flex;
    flex-direction: column;
  }

  .site-header {
    position: relative;
    top: auto;
    flex-shrink: 0;
  }

  .ads-sticky {
    position: relative;
    top: auto;
    flex-shrink: 0;
  }

  .page-scroll {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: calc(100% + 6px);
    flex-direction: column;
    align-items: stretch;
    background: #141821;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 0.55rem;
    box-shadow: var(--shadow);
    z-index: 60;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    border-radius: 10px;
  }

  .hero {
    padding-top: 1.6rem;
  }

  .shot-grid {
    grid-template-columns: 1fr 1fr;
  }

  .pc-only {
    display: none;
  }

  .mobile-only {
    display: block;
  }

  .section {
    padding: 1.8rem 0;
  }
}

@media (max-width: 480px) {
  .shot-grid,
  .category-grid {
    grid-template-columns: 1fr;
  }

  .cta-row {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}