/* ==========================================================================
   AI 安全卫士 官网样式
   视觉体系：Apple 风版面（白底/羊皮纸/深墨绿分区、大标题负字距、药丸按钮）
   品牌色：守护绿 #0E8A5F（唯一强调色）
   ========================================================================== */

:root {
  --green: #0E8A5F;
  --green-deep: #0B6E4C;
  --green-bright: #35C28C;
  --green-tint: #E8F4EE;
  --ink: #1D1D1F;
  --muted: #6E6E73;
  --muted-faint: #7A7A7A;
  --muted-dark: #A8B5AF;
  --parchment: #F5F5F7;
  --hairline: #E0E0E0;
  --dark: #0F1714;
  --dark-card: #1A2420;
  --canvas: #FFFFFF;
  --radius-lg: 18px;
  --radius-pill: 9999px;
  --section-y: 80px;
  --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-stack);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.224px;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; }

a { color: inherit; text-decoration: none; }

/* 无障碍：焦点可见 */
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 图标 ---------- */
.icon { width: 20px; height: 20px; }
.icon--lg { width: 32px; height: 32px; }
.icon--card { width: 28px; height: 28px; margin-bottom: 4px; }
.icon--platform { width: 32px; height: 32px; margin-bottom: 4px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.224px;
  transition: transform 0.15s ease, background-color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: scale(0.95); }
.btn--primary { background: var(--green); color: #fff; }
.btn--primary:hover { background: var(--green-deep); }
.btn--ghost { background: var(--canvas); color: var(--green); box-shadow: inset 0 0 0 1px var(--green); }
.btn--ghost-dark { background: transparent; color: var(--green-bright); box-shadow: inset 0 0 0 1px var(--green-bright); }
.btn--sm { padding: 8px 16px; font-size: 13px; }

.text-link {
  color: var(--green);
  font-size: 14px;
  font-weight: 500;
  margin-top: 4px;
}
.text-link:hover { text-decoration: underline; }

/* ---------- 全局导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 23, 20, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}
.nav__inner {
  max-width: 1440px;
  margin: 0 auto;
  height: 48px;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__left { display: flex; align-items: center; gap: 28px; }
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
}
.nav__brand--dark { color: var(--ink); }
.nav__links { display: flex; gap: 24px; }
.nav__links a {
  color: var(--muted-dark);
  font-size: 13px;
  transition: color 0.2s ease;
}
.nav__links a:hover { color: #fff; }

/* ---------- Hero ---------- */
.hero {
  padding: 88px 0 64px;
  text-align: center;
}
.badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--green-tint);
  color: var(--green);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 28px;
}
.hero__title {
  font-size: 56px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -1.2px;
}
.hero__sub {
  max-width: 760px;
  margin: 24px auto 0;
  font-size: 20px;
  line-height: 1.6;
  color: var(--muted);
}
.hero__cta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px;
}
.hero__trust {
  margin-top: 20px;
  font-size: 13px;
  color: var(--muted-faint);
}

/* ---------- 防护流程图 ---------- */
.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 56px;
}
.flow__card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  width: 224px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}
.flow__card h3 { font-size: 16px; font-weight: 600; }
.flow__card p { font-size: 13px; color: var(--muted); }
.flow__card--guard {
  background: var(--dark);
  border: none;
  width: 320px;
  gap: 14px;
}
.flow__card--guard h3 { color: #fff; font-size: 18px; }
.flow__card--guard p { color: var(--muted-dark); font-size: 12px; }
.flow__chips { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.chip {
  padding: 5px 10px;
  border-radius: 8px;
  background: var(--dark-card);
  color: var(--green-bright);
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}
.flow__arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.flow__arrow svg { width: 44px; height: 20px; }
.flow__arrow span { font-size: 11px; color: var(--muted); }

/* ---------- 通用分区 ---------- */
.section { padding: var(--section-y) 0; }
.section--parchment { background: var(--parchment); }
.section--dark {
  background: var(--dark);
  color: #fff;
}
.section--dark p { color: var(--muted-dark); }
.section__head {
  text-align: center;
  margin-bottom: 48px;
}
.section__head h2 {
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.5px;
}
.section__head p {
  margin-top: 12px;
  font-size: 17px;
  color: var(--muted);
}
.section--dark .section__head p { color: var(--muted-dark); }
.section__note {
  text-align: center;
  margin-top: 32px;
  font-size: 13px;
  color: var(--muted-faint);
}

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 20px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: rgba(0, 0, 0, 0.22) 0 5px 30px -8px;
}
.card h3 { font-size: 16px; font-weight: 600; margin-top: 8px; }
.card p { font-size: 13px; line-height: 1.55; color: var(--muted); margin-top: 8px; }
.card--tint { background: var(--parchment); border: none; text-align: center; }
.card--tint .icon--platform { margin: 0 auto 4px; }
.card--dark {
  background: var(--dark-card);
  border: none;
  padding: 28px;
}
.card--dark h3 { color: #fff; }
.card--dark p { color: var(--muted-dark); }
.card__num {
  font-size: 32px;
  font-weight: 600;
  color: var(--green-bright);
  letter-spacing: 0;
}

/* ---------- 数据统计 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat {
  background: var(--dark-card);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.stat__num {
  font-size: 40px;
  font-weight: 600;
  color: var(--green-bright);
  letter-spacing: 0;
}
.stat__label { font-size: 13px; color: var(--muted-dark); }

/* ---------- FAQ ---------- */
.faq {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  max-width: 960px;
  margin: 0 auto;
  overflow: hidden;
}
.faq details + details { border-top: 1px solid var(--hairline); }
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px;
  font-size: 16px;
  font-weight: 600;
  transition: background-color 0.2s ease;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { background: var(--parchment); }
.faq summary .icon { transition: transform 0.2s ease; flex-shrink: 0; }
.faq details[open] summary .icon { transform: rotate(90deg); }
.faq details p {
  padding: 0 28px 22px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 860px;
}

/* ---------- 底部 CTA ---------- */
.cta {
  background: var(--dark);
  color: #fff;
  text-align: center;
  padding: 96px 0;
}
.cta h2 {
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -1px;
}
.cta p {
  margin-top: 16px;
  font-size: 17px;
  color: var(--muted-dark);
}
.cta .hero__cta { margin-top: 32px; }

/* ---------- 页脚 ---------- */
.footer {
  background: var(--parchment);
  padding: 64px 0 32px;
}
.footer__top {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 40px;
}
.footer__brand p {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}
.footer__col { display: flex; flex-direction: column; gap: 12px; min-width: 120px; }
.footer__col h3 { font-size: 14px; font-weight: 600; }
.footer__col a {
  font-size: 13px;
  color: var(--muted);
  transition: color 0.2s ease;
}
.footer__col a:hover { color: var(--green); }
.footer__bar {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--muted-faint);
}
.footer__bar a { color: var(--muted-faint); }
.footer__bar a:hover { color: var(--green); }

/* ---------- 首页：内容导航入口卡 ---------- */
.kicker {
  font-size: 13px;
  font-weight: 600;
  color: var(--green);
  margin-bottom: 8px;
}
.entry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.entry-card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.entry-card:hover {
  transform: translateY(-3px);
  box-shadow: rgba(0, 0, 0, 0.22) 0 5px 30px -8px;
  border-color: rgba(14, 138, 95, 0.4);
}
.entry-card h3 { font-size: 21px; font-weight: 600; margin-top: 4px; }
.entry-card p { font-size: 14px; line-height: 1.6; color: var(--muted); flex-grow: 1; }
.entry-card__arrow {
  color: var(--green);
  align-self: flex-start;
  transition: transform 0.2s ease;
}
.entry-card__arrow svg { width: 20px; height: 20px; }
.entry-card:hover .entry-card__arrow { transform: translateX(4px); }

/* ---------- 首页：最新发布条 ---------- */
.latest-card {
  background: var(--dark);
  border-radius: 20px;
  padding: 30px 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.latest-card__badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--green);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
}
.latest-card__ver {
  margin-top: 10px;
  font-size: 21px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.3px;
}
.latest-card__desc {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted-dark);
}
.latest-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--green-bright);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.latest-card__link:hover { text-decoration: underline; }

/* ---------- 子页页头 ---------- */
.page-hero {
  padding: 72px 0 56px;
  text-align: center;
}
.breadcrumb {
  font-size: 13px;
  color: var(--muted-faint);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--green); }
.page-hero h1 {
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -1px;
}
.page-hero__sub {
  max-width: 720px;
  margin: 16px auto 0;
  font-size: 19px;
  line-height: 1.6;
  color: var(--muted);
}
.page-hero .hero__cta { margin-top: 28px; }

/* 当前页导航高亮 */
.nav__links a[aria-current="page"] { color: #fff; }

/* 行内链接 */
.inline-link { color: var(--green); font-weight: 500; }
.inline-link:hover { text-decoration: underline; }

/* 窄版容器（时间线） */
.container--narrow { max-width: 880px; }

/* ---------- 更新日志时间线 ---------- */
.timeline { display: flex; flex-direction: column; gap: 24px; }
.release {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: 20px;
  padding: 32px 36px;
}
.release__head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.release__ver {
  display: inline-block;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--green-tint);
  color: var(--green-deep);
  font-size: 13px;
  font-weight: 600;
}
.release__latest {
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: var(--green);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
}
.release__date { font-size: 13px; color: var(--muted); }
.release h2 {
  margin-top: 14px;
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.3px;
}
.release ul {
  margin-top: 12px;
  list-style: none;
}
.release li {
  position: relative;
  padding: 5px 0 5px 20px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}
.release li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 13px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}
.release__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  color: var(--green);
  font-size: 14px;
  font-weight: 600;
}
.release__link:hover { text-decoration: underline; }
.release__link .icon { width: 16px; height: 16px; }
.release__link--all { margin-top: 4px; padding-left: 8px; }

/* ---------- 404 ---------- */
.error-page {
  min-height: 68vh;
  display: flex;
  align-items: center;
  text-align: center;
}
.error-page__code {
  font-size: 72px;
  font-weight: 600;
  letter-spacing: -2px;
  color: var(--green);
  line-height: 1;
}
.error-page h1 {
  margin-top: 12px;
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.8px;
}
.error-page .page-hero__sub { margin-top: 14px; }
.error-page .hero__cta { margin-top: 28px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero__title { font-size: 40px; }
  .cta h2 { font-size: 40px; }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .entry-grid { grid-template-columns: repeat(2, 1fr); }
  .page-hero h1 { font-size: 40px; }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .section { padding: 56px 0; }
  .section__head h2 { font-size: 32px; }
  .hero { padding: 56px 0 48px; }
  .hero__sub { font-size: 17px; }
  .flow { flex-direction: column; }
  .flow__arrow { transform: rotate(90deg); }
  .flow__arrow span { display: none; }
  .flow__card { width: 100%; max-width: 360px; }
  .flow__card--guard { width: 100%; max-width: 360px; }
}

@media (max-width: 560px) {
  .hero__title { font-size: 30px; letter-spacing: -0.6px; }
  .cta h2 { font-size: 30px; }
  .grid--3 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  .section__head h2 { font-size: 28px; }
  .btn { width: 100%; max-width: 360px; }
  .hero__cta { flex-direction: column; align-items: center; }
  .footer__top { flex-direction: column; }
  .entry-grid { grid-template-columns: 1fr; }
  .page-hero h1 { font-size: 30px; letter-spacing: -0.6px; }
  .error-page h1 { font-size: 30px; }
}

/* 弱化动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}