/* ===========================================================
   启台 · StartDeck 落地页样式
   浅色主题 · 紫蓝渐变主色 #6D6AFC → #A855F7 · 响应式
   =========================================================== */
:root {
  --brand1: #6D6AFC;
  --brand2: #A855F7;
  --grad: linear-gradient(135deg, #6D6AFC 0%, #A855F7 100%);
  --bg: #f6f7fb;
  --bg-soft: #eef0fb;
  --text: #1f2030;
  --muted: #6b6f80;
  --card: #ffffff;
  --border: #ececf5;
  --shadow: 0 10px 30px rgba(109, 106, 252, 0.10);
  --shadow-lg: 0 24px 60px rgba(109, 106, 252, 0.18);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(168, 85, 247, 0.10), transparent 60%),
    radial-gradient(1000px 500px at -10% 10%, rgba(109, 106, 252, 0.10), transparent 55%),
    var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------------- 顶部导航 ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo {
  width: 38px; height: 38px;
  border-radius: 10px;
  overflow: hidden;
  display: grid; place-items: center;
  box-shadow: var(--shadow);
}
.brand-logo svg { width: 100%; height: 100%; display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 16px; font-weight: 700; letter-spacing: .3px; }
.brand-sub { font-size: 10.5px; color: var(--muted); letter-spacing: 1.5px; text-transform: uppercase; }

.nav-right .gh-link {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13.5px;
  transition: .18s;
}
.nav-right .gh-link:hover { color: var(--brand1); border-color: var(--brand1); background: var(--bg-soft); }

/* ---------------- Hero ---------------- */
.hero {
  text-align: center;
  padding: 72px 20px 40px;
  max-width: 820px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--brand1);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .3px;
  margin-bottom: 18px;
}
.hero-title {
  font-size: 52px;
  font-weight: 800;
  letter-spacing: .5px;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 16px;
}
.hero-sub {
  font-size: 17px;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 30px;
}
.hero-actions { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.btn-download {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 14px 30px;
  border-radius: 14px;
  background: var(--grad);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  box-shadow: var(--shadow-lg);
  transition: transform .16s, box-shadow .16s;
}
.btn-download:hover { transform: translateY(-2px); box-shadow: 0 28px 70px rgba(109, 106, 252, 0.28); }
.btn-download svg { display: block; }
.hero-ver { font-size: 13px; color: var(--muted); }

/* ---------------- 产品截图 ---------------- */
.shot-wrap { padding: 10px 20px 50px; }
.shot-placeholder {
  max-width: 960px;
  margin: 0 auto;
  border-radius: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  padding: 18px;
}
.shot-placeholder img.shot { width: 100%; display: block; border-radius: 12px; }

/* 截图占位（CSS 模拟工作台窗口） */
.mock-win {
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(160deg, #1a1830, #0f0e1f);
  border: 1px solid rgba(255,255,255,.06);
}
.mock-bar { display: flex; gap: 7px; padding: 12px 14px; background: rgba(255,255,255,.04); }
.mock-bar span { width: 11px; height: 11px; border-radius: 50%; background: #ff5f57; }
.mock-bar span:nth-child(2) { background: #febc2e; }
.mock-bar span:nth-child(3) { background: #28c840; }
.mock-body { display: flex; gap: 16px; padding: 18px; min-height: 260px; }
.mock-side { width: 150px; flex-shrink: 0; display: flex; flex-direction: column; gap: 12px; }
.mock-logo { width: 38px; height: 38px; border-radius: 10px; background: var(--grad); }
.mock-line { height: 10px; border-radius: 6px; background: rgba(255,255,255,.12); }
.mock-line.w70 { width: 70%; } .mock-line.w50 { width: 50%; }
.mock-line.w60 { width: 60%; } .mock-line.w40 { width: 40%; }
.mock-grid { flex: 1; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.mock-card { height: 64px; border-radius: 12px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.05); }
.shot-tip { text-align: center; color: var(--muted); font-size: 13px; margin-top: 14px; }

/* ---------------- 核心功能 ---------------- */
.features {
  max-width: 1080px;
  margin: 0 auto;
  padding: 10px 20px 70px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.feat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 26px 22px;
  box-shadow: var(--shadow);
  transition: transform .18s, border-color .18s, box-shadow .18s;
}
.feat:hover { transform: translateY(-4px); border-color: var(--brand1); box-shadow: var(--shadow-lg); }
.feat-ico {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: 12px;
  font-size: 24px;
  background: var(--bg-soft);
  margin-bottom: 14px;
}
.feat h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.feat p { font-size: 14px; color: var(--muted); }

/* ---------------- 页脚 ---------------- */
.footer {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 26px 20px 40px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}
.footer-mail:hover { color: var(--brand1); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 42px; }
}
@media (max-width: 560px) {
  .nav { padding: 12px 16px; }
  .gh-text { display: none; }
  .hero { padding: 48px 16px 28px; }
  .hero-title { font-size: 34px; }
  .hero-sub { font-size: 15px; }
  .features { grid-template-columns: 1fr; padding-bottom: 50px; }
  .mock-side { width: 110px; }
  .mock-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 375px) {
  .brand-name { font-size: 15px; }
  .hero-title { font-size: 30px; }
  .btn-download { padding: 13px 24px; font-size: 15px; }
}