/* KegelMate · 提肛陪伴 — 落地页(根路径,零 JS,零依赖)
   配色与应用的 styles.css 同源(teal 主色 + 米白底)。 */

:root {
  --teal: #0f9b8e;
  --teal-dark: #0b7d73;
  --teal-soft: #e4f2f0;
  --bg: #f6f8f7;
  --surface: #ffffff;
  --text: #1c2b2a;
  --muted: #6d8280;
  --line: #e3ebe9;
  --radius: 16px;
  --radius-sm: 10px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ---------------- 顶部导航 ---------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 640px;
  margin: 0 auto;
  padding: 14px 20px;
  background: rgba(246, 248, 247, .92);
  backdrop-filter: saturate(1.3) blur(8px);
}

.brand { font-size: 17px; font-weight: 700; letter-spacing: .03em; }
.brand .en { font-size: 12.5px; font-weight: 500; color: var(--muted); letter-spacing: .04em; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 22px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  border-color: var(--teal);
  background: var(--teal);
  color: #fff;
  box-shadow: 0 6px 18px rgba(15, 155, 142, .28);
}

.btn-ghost { background: transparent; }

/* ---------------- Hero ---------------- */

.hero {
  max-width: 640px;
  margin: 0 auto;
  padding: 56px 24px 40px;
  text-align: center;
}

.hero-mark {
  position: relative;
  width: 72px;
  height: 72px;
  margin: 0 auto 22px;
}
.ring {
  position: absolute;
  inset: 0;
  border: 3px solid var(--teal);
  border-radius: 50%;
  opacity: .9;
}
.ring-1 { inset: 0; }
.ring-2 { inset: 15px; opacity: .75; }
.ring-3 { inset: 29px; opacity: .6; }

.hero h1 {
  margin: 0 0 14px;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: .01em;
}

.hero-sub { margin: 0 auto 26px; max-width: 420px; color: var(--muted); }

.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.hero-note { margin: 22px 0 0; font-size: 13px; color: var(--muted); }

/* ---------------- 功能 ---------------- */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  max-width: 640px;
  margin: 0 auto;
  padding: 8px 20px 16px;
}

.feat {
  padding: 18px 18px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 1px 2px rgba(16, 50, 47, .04);
}
.feat h3 { margin: 0 0 6px; font-size: 16px; color: var(--teal-dark); }
.feat p { margin: 0; font-size: 14px; color: var(--muted); }

/* ---------------- 安装 ---------------- */

.howto {
  max-width: 640px;
  margin: 0 auto;
  padding: 30px 20px;
  text-align: center;
}
.howto h2 { margin: 0 0 20px; font-size: 21px; }

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
  text-align: left;
}
.step {
  display: flex;
  gap: 12px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.step-num {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--teal-soft);
  color: var(--teal-dark);
  font-size: 14px;
  font-weight: 700;
}
.step p { margin: 0; font-size: 14px; color: var(--text); }
.step strong { font-weight: 600; }

/* ---------------- 隐私 / 免责 ---------------- */

.privacy,
.migrate,
.disclaimer {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 20px;
}
.privacy h2,
.migrate h2 { margin: 0 0 10px; font-size: 18px; }
.privacy p,
.migrate p,
.disclaimer p { margin: 0; font-size: 14px; color: var(--muted); }
.migrate code {
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--teal-soft);
  color: var(--teal-dark);
  font-size: 13px;
}

.disclaimer {
  padding-top: 4px;
  padding-bottom: 10px;
  font-size: 13px;
}

/* ---------------- 页脚 ---------------- */

.site-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  max-width: 640px;
  margin: 0 auto;
  padding: 14px 20px 40px;
  font-size: 13px;
  color: #93a5a3;
}
.site-footer a { color: var(--teal-dark); text-decoration: none; }