/* ============================================================
   FrameLab 宣传下载页样式
   风格基准：深蓝夜空 + 白色主按钮 + 玻璃拟态 + 左对齐排版（对标 dshdesktop.com）
   系统字体 · 零位图 · 零依赖
   ============================================================ */

:root {
  --bg: #05070d;
  --bg-mid: #0a0f1e;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-2: rgba(255, 255, 255, 0.09);
  --border: rgba(255, 255, 255, 0.12);
  --text: #f2f4f8;
  --muted: #98a0b3;
  --star: #eac54f;
  --radius: 16px;
  --radius-sm: 10px;
  --nav-h: 68px;
  --container: 1120px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background:
    radial-gradient(1100px 560px at 78% -8%, rgba(64, 96, 178, 0.28), transparent 68%),
    radial-gradient(900px 480px at 12% 4%, rgba(38, 56, 108, 0.35), transparent 65%),
    linear-gradient(180deg, #0c1224 0%, var(--bg-mid) 34%, var(--bg) 78%);
  background-attachment: fixed;
  color: var(--text);
  font-family: 'DM Sans', system-ui, -apple-system, 'Segoe UI', Roboto,
    'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* 底部微光，衔接页脚 */
body::after {
  content: '';
  position: fixed;
  inset: auto 0 0;
  height: 32vh;
  background: radial-gradient(60% 120% at 50% 118%, rgba(48, 72, 140, 0.22), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

main, .site-header, .site-footer { position: relative; z-index: 1; }

/* 瓦肯三角粒子交互背景（全屏固定，内容层之下；模糊氛围化，突出软件截图） */
#bgParticles {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: block;
  pointer-events: none;
  filter: blur(6px);
  transform: scale(1.07); /* 补偿 blur 边缘透明 */
}

img, svg { display: inline-block; vertical-align: middle; }

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

kbd { display: inline-block; padding: 1px 7px; margin: 0 2px; border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 6px; background: var(--surface); font-family: inherit; font-size: 0.82em; color: var(--muted); }

code { padding: 1px 6px; border-radius: 6px; background: rgba(255, 255, 255, 0.08); font-size: 0.86em; }

/* ---------- 布局基元 ---------- */
.container {
  width: min(var(--container), 100% - 48px);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 200;
  padding: 8px 16px;
  border-radius: 0 0 10px 10px;
  background: #fff;
  color: #0a0d14;
  font-weight: 600;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s, border-color 0.18s;
}

.btn svg { width: 18px; height: 18px; flex: none; }

/* 主按钮：白底黑字（参考站样式） */
.btn-primary {
  background: #fff;
  color: #0a0d14;
  box-shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.65);
}
.btn-primary:hover {
  transform: translateY(-2px);
  background: #eceff4;
  box-shadow: 0 16px 36px -14px rgba(0, 0, 0, 0.75);
}

/* 副按钮：深色玻璃 */
.btn-ghost {
  border-color: var(--border);
  background: rgba(20, 28, 48, 0.55);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: var(--text);
}
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.28); background: rgba(30, 40, 66, 0.65); transform: translateY(-2px); }

.btn-lg { padding: 10px 16px; font-size: 0.9rem; }
.btn-lg svg { width: 17px; height: 17px; }
.btn-sm { padding: 8px 18px; font-size: 0.88rem; }

/* star 徽章 */
.star-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 4px;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid rgba(234, 197, 79, 0.35);
  background: rgba(234, 197, 79, 0.1);
  color: var(--star);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.4;
}
.star-chip svg { width: 12px; height: 12px; }

/* ---------- 导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition: background 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.site-header.scrolled {
  background: rgba(6, 9, 18, 0.78);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 24px -18px rgba(0, 0, 0, 0.9);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 24px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }

.brand-mark {
  display: inline-block;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  user-select: none;
}

.brand-name { font-size: 1.08rem; }

/* 导航药丸标签（参考站「Harness 桌面版」样式） */
.brand-pill {
  padding: 3px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
}

.nav-right { display: flex; align-items: center; gap: 6px; }

.nav-right .btn { white-space: nowrap; padding: 8px 14px; flex: none; }

.nav-link {
  padding: 8px 10px;
  border-radius: 8px;
  color: rgba(242, 244, 248, 0.82);
  font-size: 0.93rem;
  white-space: nowrap;
  transition: color 0.18s, background 0.18s;
}
.nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.06); }

/* ---------- Hero（左文右图双栏，占满首屏；字体对齐参考站：32px/500/1.16） ---------- */
.hero {
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  padding: clamp(24px, 3vw, 40px) 0 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.4fr);
  gap: clamp(24px, 3vw, 40px);
  align-items: center;
}

.hero-title {
  margin: 0 0 16px;
  font-size: clamp(1.75rem, 3vw, 2rem);
  line-height: 1.16;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: #fff;
}

.hero-sub {
  margin: 0 0 26px;
  max-width: 440px;
  color: var(--muted);
  font-size: clamp(0.88rem, 1.2vw, 0.96rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 34px;
}

/* 大数字统计（参考站 223,999 样式） */
.dl-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 22px;
}

.dl-stat strong {
  font-size: clamp(1.5rem, 2.6vw, 1.95rem);
  font-weight: 800;
  letter-spacing: 0.01em;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

.dl-stat span { color: var(--muted); font-size: 0.85rem; }

.dl-ver {
  padding: 2px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(242, 244, 248, 0.85);
}

/* ---------- 网页版在线体验（完整桌面界面按 1280×800 缩放呈现，如同开了个窗口） ----------
   外层 figure = 布局容器（左侧「全屏体验」入口 + 右侧窗口本体）；
   窗口样式全部在 .app-window 上。 */
.app-shot {
  position: relative;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 14px;
  /* 向右扩展 container 的右侧留白：与页面右缘的间距用流体值（不随窗口突兀变化），
     突破量封顶 280px——超宽屏不无限拉伸，右侧自然留出更多呼吸空间 */
  --edge: calc((100vw - min(var(--container), 100vw - 48px)) / 2);
  --inset: clamp(20px, 3.5vw, 64px);
  --reach: clamp(0px, calc(var(--edge) - var(--inset)), 280px);
  width: calc(100% + var(--reach));
  margin-right: calc(-1 * var(--reach));
}

/* 窗口本体：1280×800 虚拟视口同比例，高度随宽度自动 */
.app-window {
  position: relative;
  flex: 1;
  min-width: 0;
  aspect-ratio: 1280 / 800;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  background: #0d1119;
  box-shadow:
    0 40px 120px -40px rgba(0, 0, 0, 0.9),
    0 0 90px -30px rgba(64, 96, 178, 0.35);
  overflow: hidden;
}

/* iframe 以 1280×800 桌面视口渲染，JS 按容器宽度等比缩小（main.js fitEmbed） */
.app-embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 1280px;
  height: 800px;
  border: 0;
  background: #0a0d15;
  transform-origin: 0 0;
}

/* 手机端回退：显示静态截图（缩放窗口在小屏文字过小） */
.app-shot-img {
  display: none;
  width: 100%;
  height: auto;
}

@media (max-width: 767px) {
  .app-shot { aspect-ratio: auto; }
  .app-embed { display: none; }
  .app-shot-img { display: block; }
}

/* 「全屏体验」：窗口右上角的玻璃图标按钮（悬停有 title 提示 + 蓝色高亮） */
.try-fullscreen {
  position: absolute;
  top: 12px;
  right: clamp(12px, 1.4vw, 20px);
  z-index: 2;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(6, 9, 18, 0.72);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--text);
  transition: background 0.18s, border-color 0.18s, color 0.18s, transform 0.18s;
}
.try-fullscreen svg { width: 18px; height: 18px; }
.try-fullscreen:hover {
  background: rgba(122, 162, 247, 0.25);
  border-color: rgba(122, 162, 247, 0.65);
  color: #fff;
  transform: scale(1.06);
}

/* 平台信息行 */
.hero-platforms {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.83rem;
}

.dot { opacity: 0.4; margin-inline: 4px; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(4, 6, 12, 0.6);
  padding: 34px 0;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.footer-left { max-width: 560px; }

.footer-copy { margin: 0 0 10px; color: var(--muted); font-size: 0.88rem; }

.footer-note { margin: 0; color: rgba(152, 160, 179, 0.72); font-size: 0.8rem; line-height: 1.8; }

.footer-links { display: flex; flex-wrap: wrap; gap: 22px; }
.footer-links a { color: var(--muted); font-size: 0.9rem; transition: color 0.18s; }
.footer-links a:hover { color: #fff; }

/* ---------- 显现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn { transition: none; }
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-sub { max-width: none; }
  .app-shot {
    order: 2;
    width: 100%;
    margin-right: 0;
  }
}

@media (max-width: 767px) {
  .brand-pill { display: none; }
  .nav-link { padding: 8px 10px; }

  .hero-actions .btn { flex: 1 1 auto; min-width: 150px; }

  .dl-stat { flex-wrap: wrap; gap: 8px 12px; }

  .footer-grid { flex-direction: column; }

  /* 小屏：截图回退（窗口占满整行，右上角全屏按钮保持悬浮） */
  .app-shot { flex-direction: column; align-items: flex-start; gap: 10px; }
  .app-window { width: 100%; aspect-ratio: auto; }
  .app-embed { display: none; }
  .app-shot-img { display: block; }
}

@media (max-width: 400px) {
  .container { width: calc(100% - 32px); }
}