@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

/* ===== 变量 ===== */
:root {
  --c-bg: #1A1A2E;
  --c-accent: #E94560;
  --c-fg: #F5F5F5;
  --c-bg2: #16213E;
  --c-bg3: #0F3460;
  --c-muted: rgba(245,245,245,0.55);
  --c-border: rgba(245,245,245,0.1);
  --c-card: #1e2340;
  --radius: 4px;
  --font: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --max-w: 1160px;
  --nav-h: 48px;
  --brand-h: 64px;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--c-bg);
  color: var(--c-fg);
  font-family: var(--font);
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--c-accent); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.8; }
ul, ol { list-style: none; }
button, input, textarea, select { font-family: inherit; font-size: inherit; }

/* ===== 容器 ===== */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 站点包装 ===== */
.site-wrapper { display: flex; flex-direction: column; min-height: 100vh; }

/* ===== 顶部导航 两行式 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
}

.header-brand {
  border-bottom: 1px solid var(--c-border);
}

.header-brand .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--brand-h);
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--c-fg);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
  flex-shrink: 0;
}
.brand-link:hover { opacity: 1; color: var(--c-accent); }

.brand-logo { width: 32px; height: 32px; object-fit: contain; }
.brand-name { font-size: 1rem; }

/* 搜索框 */
.search-form {
  display: flex;
  gap: 0;
  flex: 0 1 320px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-bg2);
}
.search-form input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--c-fg);
  padding: 8px 12px;
  outline: none;
  min-width: 0;
}
.search-form input::placeholder { color: var(--c-muted); }
.search-form button {
  background: var(--c-accent);
  border: none;
  color: var(--c-fg);
  padding: 8px 16px;
  cursor: pointer;
  font-weight: 500;
  white-space: nowrap;
  transition: background var(--transition);
  min-height: 40px;
}
.search-form button:hover { background: #c73550; }

/* 导航行 */
.header-nav-row {
  background: var(--c-bg2);
}
.header-nav-row .container {
  height: var(--nav-h);
  display: flex;
  align-items: center;
}

/* aside > nav > ul > li > a 结构 */
.nav-aside { width: 100%; }
.nav-aside nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  align-items: center;
}
.nav-aside nav ul li a {
  display: block;
  color: var(--c-fg);
  font-size: 0.88rem;
  font-weight: 400;
  padding: 14px 14px;
  min-height: 48px;
  display: flex;
  align-items: center;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.nav-aside nav ul li a:hover,
.nav-aside nav ul li a[aria-current="page"] {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
  opacity: 1;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--c-bg) 0%, var(--c-bg3) 60%, #1a1a2e 100%);
  overflow: hidden;
  padding: 80px 0 120px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(233,69,96,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-kicker {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 0.2s;
}

.hero-h1 {
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-fg);
  margin-bottom: 24px;
  background: linear-gradient(135deg, #F5F5F5 40%, #E94560 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards 0.4s;
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--c-muted);
  max-width: 620px;
  margin: 0 auto 36px;
  line-height: 1.75;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards 0.6s;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero-media .hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
}

/* 斜切底边 */
.hero-slant {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--c-bg);
  clip-path: polygon(0 60%, 100% 0%, 100% 100%, 0% 100%);
  z-index: 3;
}

/* 不同页面 Hero 色调微调 */
.hero--feature { background: linear-gradient(135deg, #0d1117 0%, #1A1A2E 60%, #16213E 100%); }
.hero--pricing { background: linear-gradient(135deg, #1A1A2E 0%, #0F3460 100%); }
.hero--faq { background: linear-gradient(135deg, #16213E 0%, #1A1A2E 100%); }
.hero--about { background: linear-gradient(135deg, #1A1A2E 0%, #0F3460 50%, #1A1A2E 100%); }
.hero--contact { background: linear-gradient(135deg, #0d1117 0%, #1A1A2E 100%); }
.hero--plain { min-height: 36vh; padding: 60px 0 80px; }
.hero--plain .hero-h1 { font-size: clamp(1.6rem, 3.5vw, 2.6rem); }

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-accent);
  color: var(--c-fg);
  border: none;
  border-radius: var(--radius);
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 48px;
  letter-spacing: 0.02em;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  animation: fadeUp 0.7s ease forwards 0.8s;
}
.btn-primary:hover {
  background: #c73550;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(233,69,96,0.3);
  opacity: 1;
  color: var(--c-fg);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
  border-radius: var(--radius);
  padding: 10px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  min-height: 40px;
  transition: background var(--transition), color var(--transition);
  margin-top: 12px;
}
.btn-outline:hover {
  background: var(--c-accent);
  color: #fff;
  opacity: 1;
}

/* ===== 内容区 ===== */
.section-content {
  padding: 72px 24px;
}

/* main > article > div 三层结构由 hero + section-content 满足 */
/* content-layout: 正文 + aside 两栏 */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  align-items: start;
}

.content-main { min-width: 0; }

.content-main h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-fg);
  margin-bottom: 8px;
  padding-top: 8px;
}

.content-main .subtitle {
  color: var(--c-muted);
  font-size: 0.95rem;
  margin-bottom: 28px;
  line-height: 1.6;
}

/* 文章元数据 */
.article-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.article-date {
  font-size: 0.82rem;
  color: var(--c-muted);
  font-weight: 300;
}

/* 正文内容 */
.page-content {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(245,245,245,0.88);
}
.page-content h2,
.page-content h3 { color: var(--c-fg); margin: 32px 0 12px; font-weight: 600; }
.page-content h2 { font-size: 1.3rem; }
.page-content h3 { font-size: 1.1rem; }
.page-content p { margin-bottom: 16px; }
.page-content ul, .page-content ol { padding-left: 20px; margin-bottom: 16px; }
.page-content ul { list-style: disc; }
.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: 6px; }
.page-content a { color: var(--c-accent); }
.page-content a:hover { text-decoration: underline; }
.page-content table { width: 100%; border-collapse: collapse; margin-bottom: 24px; }
.page-content th, .page-content td {
  border: 1px solid var(--c-border);
  padding: 10px 14px;
  font-size: 0.9rem;
  text-align: left;
}
.page-content th { background: var(--c-bg2); font-weight: 600; }
.page-content blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--c-bg2);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--c-muted);
}

/* ===== 侧边栏 ===== */
.content-aside { position: sticky; top: calc(var(--brand-h) + var(--nav-h) + 16px); }

.aside-block {
  background: var(--c-card);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  border: 1px solid var(--c-border);
}

.aside-title {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-accent);
  margin-bottom: 14px;
  text-transform: uppercase;
}

.aside-links li { border-bottom: 1px solid var(--c-border); }
.aside-links li:last-child { border-bottom: none; }
.aside-links li a {
  display: block;
  padding: 9px 0;
  font-size: 0.88rem;
  color: var(--c-fg);
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition), padding-left var(--transition);
}
.aside-links li a:hover { color: var(--c-accent); padding-left: 6px; opacity: 1; }

.aside-list {
  list-style: decimal;
  padding-left: 18px;
}
.aside-list li {
  margin-bottom: 10px;
  font-size: 0.88rem;
}
.aside-list li a {
  color: var(--c-fg);
  display: block;
  line-height: 1.4;
}
.aside-list li a:hover { color: var(--c-accent); opacity: 1; }
.aside-list li small { color: var(--c-muted); font-size: 0.78rem; }

.aside-tip p { font-size: 0.88rem; color: var(--c-muted); margin-bottom: 4px; }

/* ===== 卡片区 ===== */
.section-cards {
  background: var(--c-bg2);
  padding: 72px 0;
  position: relative;
}
.section-cards::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent) 0%, transparent 100%);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 32px;
  list-style: none;
  padding: 0;
  counter-reset: card-counter;
}

.card {
  background: var(--c-card);
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  counter-increment: card-counter;
  position: relative;
}
.card::before {
  content: counter(card-counter, decimal-leading-zero);
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: 0.05em;
  opacity: 0.7;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.4);
  border-color: rgba(233,69,96,0.3);
}

.card a {
  display: block;
  padding: 24px 20px;
  color: var(--c-fg);
}
.card a:hover { opacity: 1; }

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--c-fg);
  line-height: 1.4;
  padding-right: 32px;
}

.card-desc {
  font-size: 0.85rem;
  color: var(--c-muted);
  line-height: 1.55;
  margin-bottom: 10px;
}

.card-date {
  font-size: 0.75rem;
  color: var(--c-accent);
  opacity: 0.7;
}

/* ===== FAQ 特殊样式 ===== */
.faq-content h3 {
  background: var(--c-bg2);
  padding: 14px 16px;
  border-left: 3px solid var(--c-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0 8px;
  font-size: 1rem;
  font-weight: 600;
}

/* ===== 联系表单 ===== */
.contact-form-wrap { margin-top: 32px; }
.contact-form { display: flex; flex-direction: column; gap: 20px; }

.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.88rem; font-weight: 500; color: var(--c-fg); }
.form-group input,
.form-group textarea {
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-fg);
  padding: 12px 14px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition);
  min-height: 44px;
}
.form-group input:focus,
.form-group textarea:focus { border-color: var(--c-accent); }
.form-group textarea { resize: vertical; min-height: 120px; }
.contact-form .btn-primary { animation: none; opacity: 1; align-self: flex-start; }

/* ===== div 标题装饰 h2 + p.subtitle ===== */
.section-cards h2,
.section-content h2:first-of-type {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-fg);
  margin-bottom: 8px;
}
.section-cards .subtitle {
  color: var(--c-muted);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* ===== 页脚 三栏 ===== */
.site-footer {
  background: var(--c-bg2);
  border-top: 1px solid var(--c-border);
  margin-top: auto;
  padding: 40px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 32px;
  align-items: start;
  padding-bottom: 28px;
}

.footer-brand .brand-link {
  font-size: 1rem;
  color: var(--c-fg);
  font-weight: 700;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
}
.footer-nav li { }
.footer-nav li a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.82rem;
  color: var(--c-muted);
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.footer-nav li a:hover { color: var(--c-accent); opacity: 1; }

.footer-copy {
  text-align: right;
  white-space: nowrap;
}
.footer-copy small {
  font-size: 0.78rem;
  color: var(--c-muted);
}

/* ===== 动画 ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes typing {
  from { width: 0; }
  to   { width: 100%; }
}

@keyframes blink {
  0%, 100% { border-color: transparent; }
  50% { border-color: var(--c-accent); }
}

@keyframes letterIn {
  from { opacity: 0; transform: translateY(12px) skewY(3deg); }
  to   { opacity: 1; transform: translateY(0) skewY(0); }
}

/* Kinetic 字符逐个动画（由 app.js 分割） */
.char {
  display: inline-block;
  opacity: 0;
  animation: letterIn 0.4s ease forwards;
}

/* Scroll 触发淡入 */
.js-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.js-reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .hero-h1, .hero-lead, .hero-kicker, .btn-primary { opacity: 1; }
  .char { opacity: 1; }
  .js-reveal { opacity: 1; transform: none; }
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .content-layout {
    grid-template-columns: 1fr;
  }
  .content-aside {
    position: static;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .footer-copy { text-align: left; }
}

@media (max-width: 640px) {
  .header-brand .container {
    flex-direction: column;
    height: auto;
    padding: 12px 16px;
    gap: 10px;
    align-items: stretch;
  }
  .brand-link { font-size: 0.95rem; }
  .search-form { flex: 1 1 100%; }

  .header-nav-row .container { height: auto; padding: 0 12px; overflow-x: auto; }
  .nav-aside nav ul { flex-wrap: nowrap; }
  .nav-aside nav ul li a { font-size: 0.8rem; padding: 12px 10px; white-space: nowrap; }

  .hero { min-height: 60vh; padding: 60px 0 100px; }
  .hero-h1 { font-size: clamp(1.6rem, 7vw, 2.4rem); }
  .hero-lead { font-size: 0.95rem; }

  .section-content { padding: 48px 16px; }
  .section-cards { padding: 48px 0; }
  .card-grid { grid-template-columns: 1fr; }

  .footer-nav { gap: 0; }
  .footer-nav li a { padding: 8px 8px; font-size: 0.8rem; }
}