/* 91PO官网 - 全局样式 */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-card: #1a1a28;
  --text-primary: #f5f5f7;
  --text-secondary: #a0a0b8;
  --accent-orange: #ff6600;
  --accent-purple: #7e57c2;
  --accent-pink: #ec407a;
  --accent-blue: #42a5f5;
  --border-color: #2a2a3a;
  --max-width: 1200px;
  --header-height: 64px;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

*, *::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-orange);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #ff8833;
}

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, 15, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-link img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-text span {
  color: var(--accent-orange);
}

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

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

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

.nav-cta {
  background: linear-gradient(135deg, var(--accent-orange), #ff8833);
  color: #fff !important;
  padding: 10px 22px;
  border-radius: 24px;
  font-weight: 600;
  font-size: 0.9rem;
}

.nav-cta:hover {
  color: #fff !important;
  opacity: 0.9;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* Hero */
.hero {
  padding: 60px 0 80px;
  background: linear-gradient(180deg, #12121c 0%, var(--bg-primary) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 2.4rem;
  line-height: 1.3;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, var(--accent-orange) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.badge {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.badge strong {
  color: var(--accent-orange);
}

.download-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 28px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-android {
  background: linear-gradient(135deg, var(--accent-orange), #e55a00);
  color: #fff !important;
}

.btn-ios {
  background: var(--bg-card);
  border: 2px solid var(--accent-purple);
  color: var(--text-primary) !important;
}

.hero-phone {
  position: relative;
  text-align: center;
}

.hero-phone img {
  max-width: 320px;
  margin: 0 auto;
  border-radius: 24px;
  box-shadow: var(--shadow);
}

/* Sections */
.section {
  padding: 72px 0;
}

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

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 2rem;
  margin-bottom: 12px;
}

.section-title p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

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

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

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

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

/* Screenshot Gallery */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

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

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

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

.screenshot-item figcaption {
  padding: 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Content Article */
.content-article {
  max-width: 900px;
  margin: 0 auto;
}

.content-article h2 {
  font-size: 1.6rem;
  margin: 40px 0 16px;
  color: var(--accent-orange);
}

.content-article h3 {
  font-size: 1.25rem;
  margin: 28px 0 12px;
}

.content-article p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  text-align: justify;
}

.content-article ul,
.content-article ol {
  margin: 16px 0 16px 24px;
  color: var(--text-secondary);
}

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

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

/* Category Showcase */
.category-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 60px;
}

.category-showcase.reverse {
  direction: rtl;
}

.category-showcase.reverse > * {
  direction: ltr;
}

.category-showcase img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.category-info h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.category-info p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  background: rgba(126, 87, 194, 0.2);
  color: var(--accent-purple);
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 0.8rem;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-item {
  text-align: center;
  padding: 24px;
}

.step-num {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-pink));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  margin: 0 auto 16px;
}

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

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

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  display: none;
}

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

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

.faq-question::after {
  content: "+";
  font-size: 1.2rem;
  color: var(--accent-orange);
}

/* Page Header */
.page-header {
  padding: 48px 0;
  background: var(--bg-secondary);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: 12px;
}

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

.page-content {
  padding: 48px 0 80px;
}

.page-content .container {
  max-width: 860px;
}

.page-content h2 {
  font-size: 1.4rem;
  margin: 32px 0 12px;
  color: var(--accent-orange);
}

.page-content h3 {
  font-size: 1.15rem;
  margin: 24px 0 10px;
}

.page-content p,
.page-content li {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.page-content ul,
.page-content ol {
  margin: 12px 0 12px 24px;
}

/* Error Pages */
.error-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-code {
  font-size: 6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.error-page h1 {
  font-size: 1.5rem;
  margin: 16px 0;
}

.error-page p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.btn-home {
  display: inline-block;
  background: var(--accent-orange);
  color: #fff !important;
  padding: 12px 32px;
  border-radius: 24px;
  font-weight: 600;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand img {
  width: 48px;
  border-radius: 10px;
  margin-bottom: 16px;
}

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

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 16px;
}

.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-orange);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--text-secondary);
  margin: 0 8px;
}

/* Breadcrumb */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

.breadcrumb span {
  margin: 0 8px;
}

/* Internal Links Box */
.internal-links {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  margin: 40px 0;
}

.internal-links h3 {
  font-size: 1rem;
  margin-bottom: 12px;
}

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

.internal-links a {
  background: var(--bg-secondary);
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
  }

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

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

  .hero-content h1 {
    font-size: 1.8rem;
  }

  .hero-badges,
  .download-btns {
    justify-content: center;
  }

  .hero-phone img {
    max-width: 260px;
  }

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

  .category-showcase {
    grid-template-columns: 1fr;
  }

  .category-showcase.reverse {
    direction: ltr;
  }

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

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

  .section {
    padding: 48px 0;
  }

  .section-title h2 {
    font-size: 1.5rem;
  }
}

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

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