/* ============================================================
   我了个去 · AI工具与副业实战 — 统一设计系统
   设计目标：清晰、可读、专业、移动端友好（有利于 AdSense 审核）
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7fb;
  --card-bg: #ffffff;
  --card-border: #e6e8f0;
  --text: #1d2230;
  --text-dim: #5a6172;
  --text-mute: #8a90a2;
  --accent: #5b4bdb;
  --accent-2: #7a6bf0;
  --accent-soft: #efecff;
  --ok: #1f9d6b;
  --warn: #d9822b;
  --maxw: 1080px;
  --readw: 760px;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(40, 38, 90, 0.08);
}

html { scroll-behavior: smooth; }
body {
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── 顶部导航 ── */
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--card-border);
}
.topnav .inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; padding: 0 1.2rem;
}
.topnav .logo { font-weight: 800; font-size: 1.12rem; color: var(--text); letter-spacing: .02em; }
.topnav .logo span { color: var(--accent); }
.topnav .links { display: flex; gap: 1.4rem; align-items: center; }
.topnav .links a { color: var(--text-dim); font-size: .92rem; font-weight: 500; }
.topnav .links a:hover, .topnav .links a.active { color: var(--accent); text-decoration: none; }
.topnav .links a.cta {
  background: var(--accent); color: #fff; padding: .45rem 1rem;
  border-radius: 999px; font-weight: 600;
}
.topnav .links a.cta:hover { background: var(--accent-2); }
.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text); }

/* ── 容器 ── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.2rem; }
.read { max-width: var(--readw); margin: 0 auto; padding: 0 1.2rem; }

/* ── 首页 Hero ── */
.hero {
  background: linear-gradient(180deg, var(--accent-soft), #ffffff 70%);
  padding: 4.5rem 1.2rem 3.5rem; text-align: center;
}
.hero .eyebrow {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .12em;
  color: var(--accent); background: #fff; border: 1px solid var(--accent-soft);
  padding: .3rem .9rem; border-radius: 999px; margin-bottom: 1.1rem;
}
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.25; font-weight: 800; letter-spacing: -.01em; }
.hero h1 .hl { color: var(--accent); }
.hero p.sub { color: var(--text-dim); font-size: clamp(1rem, 2.4vw, 1.2rem); margin: 1rem auto 0; max-width: 620px; }
.hero .actions { margin-top: 1.8rem; display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: .8rem 1.6rem; border-radius: 999px; font-weight: 600;
  font-size: .95rem; transition: all .2s;
}
.btn.primary { background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.btn.primary:hover { background: var(--accent-2); text-decoration: none; }
.btn.ghost { background: #fff; color: var(--text); border: 1px solid var(--card-border); }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* ── 区块标题 ── */
.section { padding: 3.5rem 1.2rem; }
.section.soft { background: var(--bg-soft); }
.section h2.title { font-size: clamp(1.5rem, 3.6vw, 2.1rem); font-weight: 800; text-align: center; }
.section p.lead { text-align: center; color: var(--text-dim); max-width: 640px; margin: .8rem auto 0; }

/* ── 卡片网格 ── */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.2rem; margin-top: 2.2rem; }
.card {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 1.5rem; display: flex; flex-direction: column; gap: .5rem; transition: all .2s;
}
.card:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-3px); text-decoration: none; }
.card .kicker { font-size: .78rem; font-weight: 700; color: var(--accent); letter-spacing: .08em; }
.card h3 { font-size: 1.12rem; font-weight: 700; color: var(--text); }
.card p { color: var(--text-dim); font-size: .9rem; line-height: 1.6; }
.card .meta { margin-top: auto; font-size: .8rem; color: var(--text-mute); }

/* ── 文章正文排版 ── */
.article { max-width: var(--readw); margin: 0 auto; padding: 2.5rem 1.2rem 4rem; }
.breadcrumb { font-size: .85rem; color: var(--text-mute); margin-bottom: 1.5rem; }
.breadcrumb a { color: var(--accent); }
.article h1 { font-size: clamp(1.7rem, 4.5vw, 2.5rem); line-height: 1.3; font-weight: 800; letter-spacing: -.01em; }
.article .meta { color: var(--text-mute); font-size: .88rem; margin: .9rem 0 2rem; display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.article .meta .tag { background: var(--accent-soft); color: var(--accent); padding: .2rem .7rem; border-radius: 999px; font-weight: 600; }
.article h2 { font-size: 1.4rem; font-weight: 700; margin: 2.4rem 0 .9rem; padding-top: .4rem; }
.article h3 { font-size: 1.12rem; font-weight: 700; margin: 1.6rem 0 .6rem; }
.article p { color: #2c3242; font-size: 1.02rem; margin-bottom: 1.1rem; }
.article ul, .article ol { padding-left: 1.4rem; margin-bottom: 1.2rem; color: #2c3242; }
.article li { margin-bottom: .55rem; font-size: 1.02rem; }
.article strong { color: var(--text); }
.article table { width: 100%; border-collapse: collapse; margin: 1.4rem 0; font-size: .92rem; overflow: hidden; border-radius: 10px; box-shadow: var(--shadow); }
.article th, .article td { border: 1px solid var(--card-border); padding: .7rem .9rem; text-align: left; vertical-align: top; }
.article th { background: var(--accent); color: #fff; font-weight: 700; }
.article tbody tr:nth-child(even) { background: var(--bg-soft); }
.article td { color: #2c3242; }
.callout {
  background: var(--accent-soft); border-left: 4px solid var(--accent); border-radius: 10px;
  padding: 1.1rem 1.3rem; margin: 1.5rem 0; color: #2c3242;
}
.callout .t { font-weight: 700; color: var(--accent); display: block; margin-bottom: .3rem; }
.note-ok { background: #e9f7f0; border-left-color: var(--ok); }
.note-warn { background: #fdf2e6; border-left-color: var(--warn); }
.article blockquote { border-left: 4px solid var(--card-border); padding-left: 1rem; color: var(--text-dim); margin: 1.4rem 0; font-style: normal; }

/* 作者框 */
.author-box { background: var(--bg-soft); border: 1px solid var(--card-border); border-radius: var(--radius); padding: 1.4rem 1.6rem; margin: 2.6rem 0 1.6rem; display: flex; gap: 1rem; align-items: flex-start; }
.author-box .avatar { width: 52px; height: 52px; border-radius: 50%; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1.2rem; flex-shrink: 0; }
.author-box h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
.author-box p { font-size: .9rem; color: var(--text-dim); margin: 0; }

/* 相关文章 */
.related { border-top: 1px solid var(--card-border); padding-top: 1.8rem; margin-top: 1rem; }
.related h3 { font-size: 1.15rem; margin-bottom: 1rem; }
.related a { display: block; padding: .7rem 0; border-bottom: 1px dashed var(--card-border); color: var(--text); font-size: .95rem; }
.related a:hover { color: var(--accent); text-decoration: none; }
.related a span { color: var(--text-mute); font-size: .82rem; float: right; }

/* 广告位占位（符合 AdSense 规范：内容为主、广告清晰标注） */
.ad-slot { margin: 2rem 0; text-align: center; }
.ad-slot .label { font-size: .72rem; color: var(--text-mute); letter-spacing: .1em; text-transform: uppercase; margin-bottom: .5rem; }

/* ── 通用页面（关于/联系等） ── */
.page { max-width: var(--readw); margin: 0 auto; padding: 2.5rem 1.2rem 4rem; }
.page h1 { font-size: clamp(1.7rem, 4.5vw, 2.4rem); font-weight: 800; margin-bottom: 1rem; }
.page h2 { font-size: 1.35rem; font-weight: 700; margin: 2.2rem 0 .8rem; }
.page p, .page li { color: #2c3242; font-size: 1.02rem; }
.page ul, .page ol { padding-left: 1.4rem; margin-bottom: 1.1rem; }

/* 联系卡片 */
.contact-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-top: 1.6rem; }
.contact-cards .c { border: 1px solid var(--card-border); border-radius: var(--radius); padding: 1.2rem; }
.contact-cards .c b { display: block; margin-bottom: .3rem; }
.contact-cards .c span { color: var(--text-dim); font-size: .9rem; }

/* ── 页脚 ── */
footer { border-top: 1px solid var(--card-border); background: var(--bg-soft); padding: 2.4rem 1.2rem; color: var(--text-mute); font-size: .85rem; }
footer .inner { max-width: var(--maxw); margin: 0 auto; display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; }
footer a { color: var(--text-dim); }
footer .links { display: flex; gap: 1.2rem; flex-wrap: wrap; }

/* ── 响应式 ── */
@media (max-width: 720px) {
  .topnav .links { display: none; position: absolute; top: 60px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--card-border); flex-direction: column; padding: 1rem 1.2rem; gap: .8rem; }
  .topnav .links.open { display: flex; }
  .nav-toggle { display: block; }
  .author-box { flex-direction: column; }
}