/* 糖心vlog - txtv.autos */
:root {
  --bg: #0a0a0c;
  --bg-soft: #121218;
  --bg-card: #1a1a22;
  --text: #f2f2f5;
  --text-muted: #a8a8b3;
  --accent: #ff4d6d;
  --accent-2: #ff8c42;
  --accent-3: #c026d3;
  --line: rgba(255, 255, 255, 0.08);
  --radius: 14px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --gradient: linear-gradient(135deg, #ffb347 0%, #ff4d6d 45%, #c026d3 100%);
  --max: 1120px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(255, 77, 109, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(192, 38, 211, 0.12), transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
}

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

a {
  color: #ff8fa3;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #ffc2cc;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(10, 10, 12, 0.85);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}

.brand span {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

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

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

.nav a:hover,
.nav a.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-soft);
  color: var(--text);
  cursor: pointer;
  font-size: 1.25rem;
}

/* Hero */
.hero {
  padding: 3.5rem 0 2.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 77, 109, 0.12);
  border: 1px solid rgba(255, 77, 109, 0.28);
  color: #ffb3c1;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero-lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0 0 1.5rem;
  max-width: 36rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 10px 30px rgba(255, 77, 109, 0.35);
}

.btn-primary:hover {
  color: #fff;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.09);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.hero-meta strong {
  color: var(--text);
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.hero-float {
  position: absolute;
  right: -4%;
  bottom: -6%;
  width: 42%;
  border-radius: 16px;
  border: 2px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  animation: floaty 4.5s ease-in-out infinite;
}

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  animation: fadeUp 0.7s ease both;
}

/* Sections */
.section {
  padding: 3rem 0;
}

.section-alt {
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.02), transparent);
}

.section-head {
  margin-bottom: 1.75rem;
}

.section-head h2 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  line-height: 1.3;
}

.section-head p {
  margin: 0;
  color: var(--text-muted);
  max-width: 48rem;
}

.prose {
  color: var(--text-muted);
}

.prose h2,
.prose h3,
.prose h4 {
  color: var(--text);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.prose h2 { font-size: 1.55rem; }
.prose h3 { font-size: 1.25rem; }
.prose h4 { font-size: 1.08rem; }

.prose p {
  margin: 0 0 1rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.2rem;
  padding-left: 1.25rem;
}

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

.prose strong {
  color: var(--text);
}

/* Feature / card grids */
.grid-3,
.grid-4,
.grid-2 {
  display: grid;
  gap: 1.15rem;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 77, 109, 0.35);
}

.card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  background: #111;
}

.card.landscape img {
  aspect-ratio: 16 / 10;
}

.card-body {
  padding: 1rem 1.1rem 1.2rem;
}

.card-body h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.card-body p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.feature-item {
  display: flex;
  gap: 1rem;
  padding: 1.15rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.feature-item img {
  width: 88px;
  height: 140px;
  object-fit: cover;
  object-position: top;
  border-radius: 10px;
  flex-shrink: 0;
}

.feature-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.feature-item p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Steps */
.steps {
  counter-reset: step;
  display: grid;
  gap: 1rem;
}

.step {
  position: relative;
  padding: 1.2rem 1.2rem 1.2rem 4rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 1.15rem;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--gradient);
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
}

.step h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.step p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Showcase split */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: center;
}

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

.shot-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}

.shot-row img {
  border-radius: 12px;
  border: 1px solid var(--line);
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
}

/* TOC / sidebar links */
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.25rem 0 0;
}

.toc a {
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  color: var(--text-muted);
  font-size: 0.88rem;
}

.toc a:hover {
  color: var(--text);
  border-color: rgba(255, 77, 109, 0.4);
}

/* Address / highlight box */
.notice {
  padding: 1.15rem 1.25rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 179, 71, 0.12), rgba(255, 77, 109, 0.12));
  border: 1px solid rgba(255, 77, 109, 0.28);
  margin: 1.25rem 0;
}

.notice strong {
  color: #ffd0d8;
}

.domain {
  font-family: ui-monospace, Consolas, monospace;
  color: #fff;
  background: rgba(0, 0, 0, 0.35);
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
}

/* FAQ */
.faq details {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.95rem 1.1rem;
  margin-bottom: 0.75rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--text);
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--accent);
}

.faq details[open] summary::after {
  content: "–";
}

.faq details p {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
}

/* Legal pages */
.page-hero {
  padding: 2.5rem 0 1rem;
}

.page-hero h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
}

.page-hero p {
  margin: 0;
  color: var(--text-muted);
}

.breadcrumb {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.85rem;
}

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

.content-wrap {
  padding: 0 0 3.5rem;
}

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

.error-page h1 {
  font-size: clamp(3rem, 10vw, 5rem);
  margin: 0;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.error-page p {
  color: var(--text-muted);
  max-width: 28rem;
  margin: 1rem auto 1.5rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: #070709;
  padding: 2.5rem 0 1.5rem;
  margin-top: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.footer-brand img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.footer-brand h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.footer-brand p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-col h4 {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
}

.footer-col a {
  display: block;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
  font-size: 0.92rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
}

/* Mobile */
@media (max-width: 900px) {
  .nav-toggle { display: grid; place-items: center; }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 1rem 1rem;
    background: rgba(10, 10, 12, 0.98);
    border-bottom: 1px solid var(--line);
  }

  .nav.open { display: flex; }

  .nav a {
    padding: 0.75rem 0.9rem;
    border-radius: 10px;
  }

  .hero-grid,
  .split,
  .grid-2,
  .grid-3,
  .grid-4,
  .footer-grid,
  .shot-row {
    grid-template-columns: 1fr;
  }

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

  .hero {
    padding: 2rem 0 1.5rem;
  }

  .hero-float {
    width: 38%;
    right: 4%;
    bottom: -4%;
  }

  .feature-item {
    flex-direction: column;
  }

  .feature-item img {
    width: 100%;
    height: auto;
    aspect-ratio: 9 / 16;
    max-height: 320px;
  }

  .section {
    padding: 2.25rem 0;
  }
}

@media (max-width: 560px) {
  .hero h1 {
    font-size: 1.65rem;
  }

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

  .btn {
    width: 100%;
  }

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