/* 随心说官网：单页静态站，视觉与 App 主界面同一气质（深色 + 渐变强调） */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0e1016;
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.09);
  --text: #e8eaf0;
  --muted: #9aa1b2;
  --grad: linear-gradient(120deg, #818cf8, #c084fc 55%, #f472b6);
}

html { color-scheme: dark; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.hero {
  min-height: 100vh;
  background:
    radial-gradient(800px 400px at 70% -10%, rgba(129, 140, 248, 0.18), transparent 65%),
    radial-gradient(600px 300px at 10% 10%, rgba(244, 114, 182, 0.10), transparent 60%);
}
.hero-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 64px 24px 48px;
}

.logo-row { display: flex; align-items: center; gap: 10px; margin-bottom: 48px; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 11px;
  background: var(--grad); color: #fff;
}
.logo-name { font-size: 18px; font-weight: 600; letter-spacing: 1px; }

h1 { font-size: clamp(30px, 5.5vw, 46px); line-height: 1.25; font-weight: 700; }
h1 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead { margin: 18px 0 32px; font-size: 16.5px; color: var(--muted); max-width: 620px; }

.cta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.btn-download {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 26px; border-radius: 12px;
  background: var(--grad); color: #fff;
  font-size: 15.5px; font-weight: 600; text-decoration: none;
  box-shadow: 0 8px 28px rgba(129, 140, 248, 0.35);
  transition: transform 0.15s, box-shadow 0.15s;
}
.btn-download:hover { transform: translateY(-1px); box-shadow: 0 12px 34px rgba(129, 140, 248, 0.45); }
.version { color: var(--muted); font-size: 13.5px; }
.invite-note { margin-top: 14px; font-size: 13.5px; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.demo { margin: 44px 0; padding: 22px 24px; max-width: 640px; }
.demo-row { display: flex; gap: 12px; align-items: baseline; font-size: 15px; }
.demo-tag {
  flex-shrink: 0; font-size: 12px; padding: 2px 9px; border-radius: 99px;
  border: 1px solid var(--border); color: var(--muted);
}
.tag-ok { border-color: rgba(74, 222, 128, 0.4); color: #4ade80; }
.demo-said s { color: var(--muted); }
.demo-arrow { margin: 12px 0 12px 4px; font-size: 12.5px; color: var(--muted); }
.demo-got { font-weight: 500; }

.features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px; margin: 8px 0 24px;
}
.feature { padding: 20px 22px; }
.feature h3 { font-size: 15.5px; margin-bottom: 8px; }
.feature p { font-size: 13.5px; color: var(--muted); }

.privacy { padding: 20px 22px; margin-bottom: 40px; }
.privacy h3 { font-size: 15.5px; margin-bottom: 8px; }
.privacy p { font-size: 13.5px; color: var(--muted); }

footer {
  display: flex; justify-content: space-between;
  padding-top: 22px; border-top: 1px solid var(--border);
  font-size: 12.5px; color: var(--muted);
}