/* HahaClean site — warm, calm, matches the app's design language.
   English-first. One accent (warm orange). Restraint over decoration. */

:root {
  --paper: #f7f5f1;
  --paper-deep: #f1ede6;
  --card: #ffffff;
  --ink: #26221f;
  --sub: #8a847c;
  --hairline: rgba(0,0,0,0.06);
  --accent: #ff6b3d;
  --accent-deep: #f2542a;
  --teal: #00a8a8;
  --blue: #3d7bfa;
  --purple: #8c5cf6;
  --space: clamp(20px, 5vw, 40px);
  --maxw: 1120px;
  --display: -apple-system, "SF Pro Rounded", "PingFang SC", system-ui, sans-serif;
  --body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { overflow-x: clip; }   /* 防止任何元素撑出横向滚动而裁切内容 */
html { scroll-behavior: smooth; }
body {
  font-family: var(--body);
  color: var(--ink);
  background: linear-gradient(180deg, var(--paper), var(--paper-deep));
  background-attachment: fixed;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { overflow-wrap: break-word; }
a { color: var(--accent-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.9em;
  background: var(--paper-deep);
  padding: 1px 6px; border-radius: 6px;
}

/* nav */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; max-width: var(--maxw); margin: 0 auto;
  padding: 20px var(--space);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; font-size: 18px; font-family: var(--display); }
.brand:hover { text-decoration: none; }
.brand img { border-radius: 9px; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 15px; font-weight: 500; }
.nav-links a { color: var(--ink); }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 650; font-size: 15px; padding: 12px 22px;
  border-radius: 999px; transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #fff; box-shadow: 0 6px 18px rgba(242,84,42,0.28);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(242,84,42,0.34); }
.btn-ghost {
  background: var(--card); color: var(--ink);
  border: 1.5px solid var(--hairline);
}
.btn-ghost:hover { background: var(--paper-deep); }

/* hero */
.hero {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(28px, 6vw, 64px) var(--space) clamp(32px, 6vw, 72px);
  display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(24px, 5vw, 56px);
  align-items: center;
}
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.14em; font-size: 12px;
  font-weight: 700; color: var(--accent-deep); margin-bottom: 14px;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(34px, 7vw, 68px); line-height: 1.04;
  letter-spacing: -0.02em; font-weight: 800; margin-bottom: 18px;
}
.lede { font-size: clamp(16px, 2vw, 18px); color: #4a443d; max-width: 32ch; margin-bottom: 26px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 16px; }
.sub { font-size: 13px; color: var(--sub); }
.hero-art img {
  width: 100%; border-radius: 22px;
  box-shadow: 0 24px 60px rgba(120,80,40,0.14);
}

/* strip */
.strip {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--space);
}
.strip p {
  background: var(--card); border: 1px solid var(--hairline);
  border-radius: 16px; padding: 18px 22px;
  font-size: 15px; color: #4a443d; text-align: center;
  box-shadow: 0 8px 24px rgba(0,0,0,0.04);
}

/* features */
.features { max-width: var(--maxw); margin: 0 auto; padding: clamp(48px, 8vw, 88px) var(--space); }
.features h2, .open h2 {
  font-family: var(--display);
  font-size: clamp(26px, 4vw, 36px); letter-spacing: -0.01em; font-weight: 800;
  margin-bottom: 32px; text-align: center;
}
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--hairline);
  border-radius: 18px; padding: 24px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.04);
  transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 16px 40px rgba(0,0,0,0.07); }
.ic {
  width: 44px; height: 44px; border-radius: 13px; margin-bottom: 14px;
  display: grid; place-items: center; font-size: 20px; color: #fff;
}
.ic-clean { background: linear-gradient(135deg, #ff8a4d, var(--accent-deep)); }
.ic-uninstall { background: linear-gradient(135deg, #f0686a, #d63d3f); }
.ic-fan { background: linear-gradient(135deg, #2cc6c6, var(--teal)); }
.ic-mem { background: linear-gradient(135deg, #a47bff, var(--purple)); }
.ic-env { background: linear-gradient(135deg, #46b86a, #2c9a52); }
.ic-disk { background: linear-gradient(135deg, #5b92fb, var(--blue)); }
.card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; font-family: var(--display); }
.card p { font-size: 14.5px; color: #5a544d; }

/* open source */
.open { padding: clamp(40px, 7vw, 80px) var(--space); }
.open-inner {
  max-width: 720px; margin: 0 auto; text-align: center;
  background: var(--card); border: 1px solid var(--hairline);
  border-radius: 24px; padding: clamp(32px, 5vw, 52px);
  box-shadow: 0 16px 50px rgba(0,0,0,0.06);
}
.open-inner p { font-size: 16px; color: #4a443d; margin-bottom: 24px; }
.open-inner .cta-row { justify-content: center; margin-bottom: 14px; }
.privacy { font-size: 13px; color: var(--sub); margin-bottom: 0 !important; }

/* footer */
.foot {
  max-width: var(--maxw); margin: 0 auto;
  padding: 36px var(--space) 56px; text-align: center;
  border-top: 1px solid var(--hairline);
}
.foot-row { display: inline-flex; align-items: center; gap: 9px; font-weight: 700; font-family: var(--display); margin-bottom: 10px; }
.foot-row img { border-radius: 7px; }
.foot p { font-size: 13.5px; color: var(--sub); margin-bottom: 6px; }
.alt-lang { font-size: 12.5px; color: var(--sub); opacity: 0.8; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; text-align: center; }
  .lede { max-width: none; }
  .cta-row { justify-content: center; }
  .hero-art { order: -1; }
  .grid { grid-template-columns: 1fr; }
  .nav-links a:not(.btn) { display: none; }
}