/* 首页 */
@import url("./ui.css");
@import url("./agent.css");

body { background: var(--color-surface); }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: var(--z-nav);
  border-bottom: 1px solid transparent;
  background: oklch(100% 0 0 / 0.82); backdrop-filter: saturate(1.6) blur(12px); -webkit-backdrop-filter: saturate(1.6) blur(12px);
}
@supports (animation-timeline: scroll()) {
  .topbar { animation: bar-edge linear both; animation-timeline: scroll(); animation-range: 0 64px; }
  @keyframes bar-edge { to { border-bottom-color: var(--color-line); } }
}
.bar { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); min-height: 64px; }

/* ---------- 首屏 ---------- */
.hero { position: relative; isolation: isolate; overflow: hidden; }
/* 背景：logo 色的柔光，加一层渐隐的点阵 */
.hero::before {
  content: ""; position: absolute; inset: -64px 0 0; z-index: -1;
  background:
    radial-gradient(40% 50% at 78% 30%, oklch(80% 0.1 264 / 0.35), transparent 70%),
    radial-gradient(30% 40% at 95% 70%, oklch(82% 0.1 300 / 0.3), transparent 70%),
    radial-gradient(35% 45% at 10% 10%, oklch(92% 0.05 240 / 0.6), transparent 70%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background-image: radial-gradient(oklch(60% 0.03 265 / 0.22) 1px, transparent 1.2px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(70% 70% at 60% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(70% 70% at 60% 40%, #000 30%, transparent 75%);
}
.hero-in {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: var(--space-3xl);
  align-items: center; padding-block: var(--space-4xl) var(--space-5xl);
}
.hero-copy { display: grid; justify-items: start; gap: var(--space-lg); }
.hero h1 { font-size: var(--text-display); font-weight: 750; line-height: 1.18; letter-spacing: 0.01em; }
.hl { background: var(--gradient-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { max-width: 30em; color: var(--color-ink-2); font-size: var(--text-lead); line-height: 1.7; }
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-xs); }
.hero-note { color: var(--color-muted); font-size: var(--text-sm); }
.hero .agent { min-width: 0; }

/* ---------- 通用分区 ---------- */
.section { padding-block: var(--space-5xl); }
.section-head { display: grid; justify-items: center; gap: var(--space-sm); max-width: 640px; margin: 0 auto var(--space-3xl); text-align: center; }
.kicker { color: var(--color-brand); font-size: var(--text-sm); font-weight: 650; letter-spacing: 0.08em; }
.section h2, .share h2 { font-size: var(--text-section); font-weight: 700; line-height: 1.3; }

/* ---------- 三步 ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-lg); counter-reset: step; }
.step {
  position: relative; display: grid; align-content: start; gap: var(--space-xs);
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
  border: 1px solid var(--color-line); border-radius: var(--radius-xl); background: var(--color-surface-2);
}
.step:not(:last-child)::after {
  content: ""; position: absolute; top: 52px; right: calc(-1 * var(--space-lg)); width: var(--space-lg); height: 1px;
  background: repeating-linear-gradient(90deg, var(--color-line-2) 0 4px, transparent 4px 8px);
}
.step-n {
  display: grid; place-items: center; width: 40px; height: 40px; margin-bottom: var(--space-sm);
  border-radius: var(--radius-lg); background: var(--color-surface); box-shadow: var(--shadow-sm), inset 0 0 0 1px var(--color-line);
  color: var(--color-brand); font-size: var(--text-lg); font-weight: 700; font-variant-numeric: tabular-nums;
}
.step h3 { font-size: var(--text-lg); font-weight: 650; }
.step p { color: var(--color-ink-2); font-size: var(--text-md); }

/* ---------- 独立链接与可见范围 ---------- */
.share { padding-block: var(--space-5xl); border-block: 1px solid var(--color-line); background: var(--color-bg); }
.share-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-3xl); align-items: center; }
.share-link { display: grid; justify-items: start; gap: var(--space-md); min-width: 0; }
.share-link .lead { margin-bottom: var(--space-sm); }
.addr {
  display: flex; align-items: center; gap: 10px; max-width: 100%;
  padding: 14px 20px; border: 1px solid var(--color-line); border-radius: var(--radius-full);
  background: var(--color-surface); box-shadow: var(--shadow-md); color: var(--color-ok);
}
.addr-text {
  min-width: 0; color: var(--color-ink); font-family: var(--font-mono); font-size: clamp(1rem, 1vw + 0.7rem, 1.375rem);
  letter-spacing: -0.01em; overflow-wrap: anywhere; font-variant-numeric: slashed-zero;
}
.addr-name { padding: 0 6px; border-radius: var(--radius-sm); background: var(--color-brand-soft); color: var(--color-brand); font-family: var(--font-sans); font-weight: 650; }

.share-vis { display: grid; gap: var(--space-md); }
.share-vis h3 { color: var(--color-muted); font-size: var(--text-sm); font-weight: 600; }
.tiers { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-sm); }
.tier {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-md); align-items: start;
  padding: var(--space-md) var(--space-lg); border: 1px solid var(--color-line); border-radius: var(--radius-lg);
  background: var(--color-surface); box-shadow: var(--shadow-xs);
}
.tier-icon { display: grid; place-items: center; width: 40px; height: 40px; border-radius: var(--radius-md); background: var(--color-brand-soft); color: var(--color-brand); }
.tier b { display: block; font-weight: 650; }
.tier p { color: var(--color-muted); font-size: var(--text-sm); }

/* ---------- 收尾引导 ---------- */
.cta { padding-block: var(--space-4xl); }
.cta-box {
  position: relative; isolation: isolate; overflow: hidden;
  display: grid; justify-items: center; gap: var(--space-sm); padding: var(--space-3xl) var(--space-lg);
  border-radius: 24px; background: var(--gradient-brand); color: oklch(100% 0 0); text-align: center;
}
.cta-box::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background-image: radial-gradient(oklch(100% 0 0 / 0.16) 1px, transparent 1.2px); background-size: 22px 22px;
  -webkit-mask-image: linear-gradient(to bottom, #000, transparent); mask-image: linear-gradient(to bottom, #000, transparent);
}
.cta-box h2 { color: inherit; font-size: var(--text-section); font-weight: 700; }
.cta-box p { color: oklch(100% 0 0 / 0.85); font-size: var(--text-lead); }
.cta-btn { margin-top: var(--space-md); border-color: transparent; color: var(--color-brand-ink); box-shadow: var(--shadow-md); }
.cta-btn:hover { border-color: transparent; background: oklch(97% 0.012 264); }
.cta-btn:focus-visible { outline-color: oklch(100% 0 0); }

/* ---------- 页脚 ---------- */
.foot { border-top: 1px solid var(--color-line); }
.foot-in { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-sm) var(--space-lg); padding-block: var(--space-xl); color: var(--color-muted); font-size: var(--text-sm); }
.foot .mark { font-size: var(--text-base); }
.foot-link { margin-left: auto; border-radius: var(--radius-xs); color: var(--color-ink-2); text-decoration: none; }
.foot-link:hover { color: var(--color-brand); }

/* ---------- 响应式 ---------- */
@media (max-width: 68rem) {
  .hero-in { grid-template-columns: minmax(0, 1fr); gap: var(--space-2xl); padding-block: var(--space-3xl) var(--space-4xl); }
  .hero-copy { justify-items: center; text-align: center; }
  .hero-cta { justify-content: center; }
  .share-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-2xl); }
}
@media (max-width: 52rem) {
  .steps { grid-template-columns: minmax(0, 1fr); gap: var(--space-sm); }
  .step:not(:last-child)::after { display: none; }
  .section, .share { padding-block: var(--space-4xl); }
  .section-head { margin-bottom: var(--space-2xl); }
}
@media (max-width: 40rem) {
  .who { display: none; }
  .hero-in { padding-block: var(--space-2xl) var(--space-3xl); }
  .hero h1 br { display: none; }
  .addr { padding: 12px 16px; border-radius: var(--radius-lg); }
  .cta { padding-block: var(--space-3xl); }
  .cta-box { padding: var(--space-2xl) var(--space-md); border-radius: var(--radius-xl); }
}