/* 抖阴视频官网 - dyvip.lol */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-card: #1a1a1a;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --accent: #ff2d55;
  --accent-hover: #ff4d6d;
  --border: #2a2a2a;
  --max-width: 1200px;
  --header-height: 64px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
}

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

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}

.logo-link:hover {
  color: var(--text-primary);
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
}

.nav-main {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-main a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-main a:hover,
.nav-main a.active {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* Hero */
.hero {
  padding: 60px 0 50px;
  background: linear-gradient(180deg, #1a0a10 0%, var(--bg-primary) 100%);
}

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

.hero-content h1 {
  font-size: 2.2rem;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-content h1 span {
  color: var(--accent);
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 28px;
}

.btn-group {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  color: #fff;
  box-shadow: 0 8px 24px rgba(255, 45, 85, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-image {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.hero-image img {
  width: 100%;
  border-radius: 16px;
}

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

.section-alt {
  background: var(--bg-secondary);
}

.section-title {
  font-size: 1.75rem;
  margin-bottom: 12px;
  text-align: center;
}

.section-subtitle {
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 40px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 24px;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* Screenshot Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.gallery-item {
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: transform 0.2s;
}

.gallery-item:hover {
  transform: scale(1.03);
}

.gallery-item img {
  width: 100%;
  aspect-ratio: 9/16;
  object-fit: cover;
}

.gallery-caption {
  padding: 10px 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Category Tags */
.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 32px;
}

.tag {
  padding: 6px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.tag.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* Content Article */
.article-content {
  max-width: 860px;
  margin: 0 auto;
}

.article-content h2 {
  font-size: 1.5rem;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
}

.article-content h3 {
  font-size: 1.2rem;
  margin: 28px 0 12px;
  color: var(--accent);
}

.article-content p {
  margin-bottom: 16px;
  color: #d0d0d0;
}

.article-content ul,
.article-content ol {
  margin: 0 0 16px 24px;
  color: #d0d0d0;
}

.article-content li {
  margin-bottom: 8px;
}

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

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 18px 22px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--accent);
}

.faq-item.open .faq-question::after {
  content: "−";
}

.faq-answer {
  padding: 0 22px 18px;
  color: var(--text-secondary);
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Download Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  counter-reset: step;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 20px;
  text-align: center;
  position: relative;
}

.step-card::before {
  counter-increment: step;
  content: counter(step);
  display: block;
  width: 36px;
  height: 36px;
  line-height: 36px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  margin: 0 auto 14px;
  font-weight: 700;
}

.step-card h4 {
  margin-bottom: 8px;
}

.step-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Page Header (sub pages) */
.page-header {
  padding: 48px 0 32px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.page-header p {
  color: var(--text-secondary);
}

.page-content {
  padding: 48px 0 64px;
}

.page-content .article-content h2 {
  font-size: 1.35rem;
}

/* Error Pages */
.error-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-code {
  font-size: 6rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-page h1 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.error-page p {
  color: var(--text-secondary);
  margin-bottom: 28px;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
}

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--text-secondary);
}

.footer-bottom a:hover {
  color: var(--accent);
}

.footer-simple {
  border-top: none !important;
  padding-top: 0 !important;
}

.footer-nav-inline {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.footer-nav-inline a {
  display: inline-block;
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.footer-nav-inline a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(255, 45, 85, 0.08);
}

.breadcrumb {
  padding: 16px 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.header-breadcrumb {
  display: none;
}

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

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

.breadcrumb span {
  margin: 0 8px;
}

/* Internal links highlight */
.internal-links {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 32px 0;
}

.internal-links h3 {
  margin-bottom: 14px;
  font-size: 1.05rem;
}

.internal-links ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.internal-links a {
  font-size: 0.92rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

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

@media (max-width: 768px) {
  .site-header {
    height: auto;
    min-height: var(--header-height);
    overflow: visible;
  }

  .nav-toggle {
    display: block;
    flex-shrink: 0;
    order: 3;
    position: relative;
    z-index: 1002;
  }

  .logo-link {
    flex-shrink: 0;
    order: 1;
    position: relative;
    z-index: 1002;
  }

  .header-breadcrumb {
    display: block;
    flex: 1;
    order: 2;
    min-width: 0;
    margin: 0 6px;
    padding: 0;
    text-align: right;
    font-size: 0.78rem;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
    z-index: 1002;
  }

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

  .page-breadcrumb {
    display: none;
  }

  .header-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1001;
  }

  .nav-main {
    display: none;
    position: static;
    top: auto;
    left: auto;
    right: auto;
    width: 100%;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 16px 20px;
    gap: 0;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  }

  .nav-main.open {
    display: flex;
  }

  .nav-main li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  body.nav-open {
    overflow: hidden;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content h1 {
    font-size: 1.65rem;
  }

  .btn-group {
    justify-content: center;
  }

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

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

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px 16px;
    margin-bottom: 24px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    text-align: center;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border);
  }

  .footer-brand .logo-link {
    justify-content: center;
  }

  .footer-brand p {
    font-size: 0.82rem;
    line-height: 1.55;
    max-width: 340px;
    margin: 10px auto 0;
  }

  .footer-col h4 {
    font-size: 0.85rem;
    margin-bottom: 10px;
  }

  .footer-col ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .footer-col li {
    margin-bottom: 0;
  }

  .footer-col a {
    display: inline-block;
    padding: 6px 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 18px;
    font-size: 0.8rem;
    white-space: nowrap;
  }

  .footer-col a:hover {
    border-color: var(--accent);
    background: rgba(255, 45, 85, 0.08);
  }

  .site-footer {
    padding: 32px 0 calc(20px + env(safe-area-inset-bottom, 0px));
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    padding-top: 16px;
    gap: 10px;
  }

  .footer-bottom p {
    font-size: 0.78rem;
    line-height: 1.6;
  }

  .section {
    padding: 40px 0;
  }

  .page-header {
    padding: 24px 0 20px;
  }

  .page-header h1 {
    font-size: 1.45rem;
  }

  .page-header p {
    font-size: 0.88rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 40px 0 30px;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .gallery-grid {
    gap: 10px;
  }

  .site-footer {
    padding: 24px 0 calc(16px + env(safe-area-inset-bottom, 0px));
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 20px;
  }

  .footer-brand {
    padding-bottom: 14px;
  }

  .footer-brand p {
    font-size: 0.78rem;
    max-width: 100%;
  }

  .footer-col {
    padding: 14px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
  }

  .footer-col h4 {
    font-size: 0.82rem;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
  }

  .footer-col ul {
    gap: 8px 6px;
  }

  .footer-col a {
    padding: 7px 11px;
    font-size: 0.78rem;
  }

  .footer-bottom p {
    font-size: 0.75rem;
  }

  .footer-bottom p + p {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px 0;
  }
}