:root {
  --bg: #ffffff;
  --bg-soft: #f5f5f8;
  --text: #1c1c1e;
  --muted: #6e6e73;
  --line: rgba(60, 60, 67, 0.14);
  --accent: #0a84ff;
  --card: #ffffff;
  --grad: linear-gradient(135deg, #ff5f8f 0%, #b45cf0 35%, #4f7dff 70%, #3fd0ff 100%);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f12;
    --bg-soft: #18181d;
    --text: #f2f2f7;
    --muted: #a1a1aa;
    --line: rgba(235, 235, 245, 0.14);
    --accent: #4da3ff;
    --card: #1c1c22;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }

/* Header */
header.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px); border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; gap: 12px; height: 56px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; font-size: 17px; }
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
nav.links { margin-left: auto; display: flex; gap: 18px; font-size: 14px; }
nav.links a { color: var(--muted); }
nav.links a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero { text-align: center; padding: 72px 20px 56px; }
.hero img.icon { width: 128px; height: 128px; border-radius: 28px; box-shadow: 0 18px 50px rgba(79, 125, 255, 0.25); }
.hero h1 { font-size: clamp(36px, 7vw, 56px); line-height: 1.1; margin: 28px 0 12px; letter-spacing: -0.02em; }
.hero h1 span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: clamp(17px, 2.6vw, 21px); color: var(--muted); max-width: 640px; margin: 0 auto; }
.platforms { margin-top: 18px; color: var(--muted); font-size: 14px; }
.badges { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }
.badge { display: inline-flex; flex-direction: column; align-items: flex-start; padding: 9px 18px; border-radius: 12px; background: var(--text); color: var(--bg); min-width: 170px; }
.badge small { font-size: 11px; opacity: 0.75; }
.badge strong { font-size: 17px; font-weight: 600; }
.badge.soon { opacity: 0.55; cursor: default; }
.badge:hover { text-decoration: none; }

/* Features */
section.features { padding: 24px 20px 64px; }
section h2 { font-size: 28px; text-align: center; margin: 0 0 32px; letter-spacing: -0.01em; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card { background: var(--bg-soft); border-radius: 18px; padding: 22px; }
.card .emoji { font-size: 28px; line-height: 1; }
.card h3 { font-size: 17px; margin: 12px 0 6px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.privacy-band { background: var(--bg-soft); padding: 48px 0; text-align: center; }
.privacy-band p { color: var(--muted); max-width: 620px; margin: 8px auto 0; }

/* Article pages */
article { padding: 48px 0 64px; max-width: 760px; }
article h1 { font-size: 34px; margin: 0 0 6px; letter-spacing: -0.01em; }
article .meta { color: var(--muted); font-size: 14px; margin-bottom: 28px; }
article h2 { font-size: 20px; text-align: left; margin: 32px 0 8px; }
article ul { padding-left: 22px; }
article li { margin: 4px 0; }
article .note { background: var(--bg-soft); border-radius: 14px; padding: 16px 18px; }
details { background: var(--bg-soft); border-radius: 14px; padding: 14px 18px; margin: 10px 0; }
details summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 2px; color: var(--muted); }

footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 13px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; }
footer .right { margin-left: auto; display: flex; gap: 16px; }

@media (max-width: 560px) {
  nav.links { gap: 12px; font-size: 13px; }
  footer .right { margin-left: 0; }
}