/* SychicAI-OS 首页样式 —— 直接沿用客户端主题令牌（web/src/style.css 的「黑绿主题」），
   避免官网与产品观感两套皮。所有色值都取自那份令牌，不另创：
     底色 #08090a / 面板 #0c0d0f / 浮起 #121417 / 分隔 rgba(255,255,255,.07)
     绿色主旋律 #1ee39c（亮 #46f0b0、深 #06d68f）/ 字色 #eef3f0 · #a2aba7 · #5f6a66
   纪律：不用 emoji 图标、不做整页渐变背景、不做过度动画。 */

:root {
  --bg-0: #08090a;
  --bg-1: #0c0d0f;
  --bg-2: #121417;
  --bg-3: #181b1f;
  --line: rgba(255, 255, 255, 0.07);
  --line-strong: rgba(255, 255, 255, 0.12);

  --green: #1ee39c;
  --green-bright: #46f0b0;
  --green-deep: #06d68f;
  --green-soft: rgba(30, 227, 156, 0.12);
  --green-line: rgba(30, 227, 156, 0.35);
  --shadow-green: 0 8px 28px -8px rgba(30, 227, 156, 0.35);

  --text-1: #eef3f0;
  --text-2: #a2aba7;
  --text-3: #5f6a66;

  --radius: 12px;
  --radius-lg: 18px;
  --mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, 'Cascadia Mono', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg-0);
  color: var(--text-1);
  font: 15px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(30, 227, 156, 0.28); color: #fff; }

a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--mono);
  font-size: 0.9em;
  padding: 0.1em 0.4em;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg-2);
  color: var(--green-bright);
}

strong { color: #fff; font-weight: 600; }

/* ---------- 顶部导航 ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.8rem 1.5rem;
  background: rgba(8, 9, 10, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text-1);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand img { display: block; border-radius: 6px; }

.nav-links { display: flex; gap: 1.1rem; margin-left: auto; font-size: 0.9rem; }
.nav-links a { color: var(--text-2); }
.nav-links a:hover { color: var(--text-1); text-decoration: none; }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.62rem 1.15rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg-2);
  color: var(--text-1);
  font-size: 0.92rem;
  line-height: 1;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover { border-color: var(--green-line); text-decoration: none; }

.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.85rem; }

.btn-primary {
  background: linear-gradient(135deg, var(--green-bright), var(--green-deep));
  border-color: transparent;
  color: var(--on-brand, #04150d);
  font-weight: 600;
  box-shadow: var(--shadow-green);
}

.btn-primary:hover { filter: brightness(1.06); color: #04150d; }

.btn[data-missing] {
  background: var(--bg-1);
  border-color: var(--line);
  color: var(--text-3);
  box-shadow: none;
  filter: none;
  cursor: not-allowed;
}

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

main { max-width: 68rem; margin: 0 auto; padding: 0 1.5rem 4rem; }

.hero { padding: 4rem 0 3rem; max-width: 46rem; }

.hero-brand { display: flex; align-items: center; gap: 1.1rem; margin-bottom: 1.2rem; }

.hero-brand img { display: block; border-radius: 14px; }

.eyebrow {
  margin: 0 0 0.45rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--green);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4.4vw, 2.4rem);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.hero .sub {
  margin: 0.35rem 0 0;
  font-family: var(--mono);
  font-size: 0.92rem;
  color: var(--text-2);
  letter-spacing: 0.05em;
}

.lede { margin: 1.5rem 0 1.8rem; font-size: 1.05rem; color: var(--text-2); }

.cta { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.hint { margin: 1rem 0 0; font-size: 0.85rem; color: var(--text-3); }

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.8rem 0 0;
  padding: 0;
  list-style: none;
}

.badges li {
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-1);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-2);
}

/* ---------- 通用区块 ---------- */

.section { padding: 3rem 0; border-top: 1px solid var(--line); }

.section h2 {
  margin: 0 0 0.6rem;
  font-size: 1.35rem;
  font-weight: 700;
}

.section-lede { margin: 0 0 2rem; color: var(--text-2); max-width: 42rem; }

/* ---------- 四阶段 ---------- */

.phases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.phases li { background: var(--bg-1); padding: 1.2rem 1.2rem 1.3rem; }

.phase {
  display: inline-block;
  margin-bottom: 0.6rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--green);
}

.phases h3 { margin: 0 0 0.4rem; font-size: 1rem; }
.phases p { margin: 0; font-size: 0.9rem; color: var(--text-2); }

/* ---------- 能力卡片 ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: 1rem;
}

.card {
  padding: 1.2rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-1);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.card:hover { border-color: var(--green-line); background: var(--bg-2); }

.card h3 { margin: 0 0 0.5rem; font-size: 1rem; }

.card p { margin: 0; font-size: 0.9rem; color: var(--text-2); }

.card .meta {
  margin-top: 0.7rem;
  font-family: var(--mono);
  font-size: 0.73rem;
  color: var(--text-3);
}

/* ---------- 本地优先 ---------- */

.split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}

.split > div {
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--line);
  border-left: 2px solid var(--green);
  border-radius: var(--radius);
  background: var(--bg-1);
}

.split h3 { margin: 0 0 0.4rem; font-size: 0.98rem; }
.split p { margin: 0; font-size: 0.9rem; color: var(--text-2); }

/* ---------- 安装步骤 ---------- */

.steps { margin: 0; padding: 0; list-style: none; counter-reset: step; }

.steps > li {
  position: relative;
  margin-bottom: 1.4rem;
  padding: 1.1rem 1.2rem 1.2rem 3.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-1);
  counter-increment: step;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 1.2rem;
  top: 1.1rem;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--green);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.05rem 0.45rem;
  background: var(--bg-0);
}

.steps h3 { margin: 0 0 0.4rem; font-size: 1rem; }
.steps p { margin: 0; font-size: 0.9rem; color: var(--text-2); }

.dl-line { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem; margin-top: 0.9rem; }

.dl-state { font-family: var(--mono); font-size: 0.78rem; color: var(--text-3); }
.dl-state[data-ok='0'] { color: #e88080; }
.dl-state[data-ok='1'] { color: var(--green); }

.note {
  margin: 0.4rem 0 0;
  padding: 0.85rem 1rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  font-size: 0.88rem;
  color: var(--text-2);
}

/* ---------- 常见问题 ---------- */

.faq { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }

.faq details { border-bottom: 1px solid var(--line); background: var(--bg-1); }
.faq details:last-child { border-bottom: 0; }

.faq summary {
  padding: 0.9rem 1.1rem;
  cursor: pointer;
  font-size: 0.95rem;
  list-style: none;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::before {
  content: '+';
  display: inline-block;
  width: 1.1rem;
  color: var(--green);
  font-family: var(--mono);
}

.faq details[open] summary::before { content: '−'; }

.faq p { margin: 0; padding: 0 1.1rem 1rem 2.2rem; font-size: 0.9rem; color: var(--text-2); }

/* ---------- 页脚 ---------- */

.foot {
  border-top: 1px solid var(--line);
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-3);
}

.foot p { margin: 0.3rem 0; }
.foot-links { display: flex; justify-content: center; gap: 1.2rem; }
.foot-links a { color: var(--text-2); }
.foot-note { max-width: 40rem; margin: 0.8rem auto 0 !important; font-size: 0.8rem; }

/* 页脚：备案号必须可点击跳转（法规要求），且 Logo 紧挨备案号（国内站常规写法）。
   多条备案号并排，窄屏自动换行。 */
.foot-tag { color: var(--text-2); }

.foot-icp {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 1.2rem;
  font-size: 0.82rem;
}

.foot-icp-item { display: inline-flex; align-items: center; gap: 0.4rem; }

.foot-icp-item img { display: block; border-radius: 4px; }

.foot-icp a { color: var(--text-2); }
.foot-icp a:hover { color: var(--green); }

/* ---------- 窄屏 ---------- */

@media (max-width: 46rem) {
  .nav { gap: 1rem; padding: 0.7rem 1rem; flex-wrap: wrap; }
  .nav-links { order: 3; width: 100%; margin-left: 0; gap: 0.9rem; overflow-x: auto; }
  main { padding: 0 1rem 3rem; }
  .hero { padding: 2.5rem 0 2rem; }
  .hero-brand img { width: 56px; height: 56px; }
  .steps > li { padding: 1rem 1rem 1.1rem 1rem; }
  .steps > li::before { position: static; display: inline-block; margin-bottom: 0.5rem; }
}