/* =========================================================
   数据分析 — 公共样式（个人作品站）
   ========================================================= */

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #1a1a2e; background: #fff; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

:root {
  /* 与登录页（public/css/login.css）色板对齐：松绿 / 祖母绿 / 青绿 / 薄荷 */
  --pine: #0e3a2b;
  --emerald: #1c6b54;
  --emerald-soft: #2f8d6f;
  --teal: #15808c;
  --mint: #5fd6aa;
  --mint-bright: #7ff0c6;

  --primary: #15808c;
  --primary-dark: #1c6b54;
  --grad-1: #1c6b54; --grad-2: #15808c;   /* 与登录按钮渐变方向一致：emerald → teal */
  --grad-purple: #667eea; --grad-purple2: #764ba2;
  --text-main: #122a21; --text-sub: #4a5568; --text-muted: #61756c;
  --border: #e3ece7; --bg-soft: #edf3f0;
}

/* ===== 导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; height: 60px; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 20px; font-weight: 700; color: var(--text-main);
  letter-spacing: .5px;
}
.logo-icon { width: 32px; height: 32px; color: var(--primary); display: flex; align-items: center; }
.logo-icon svg { width: 100%; height: 100%; }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-size: 15px; color: var(--text-sub); font-weight: 500; transition: color .2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -20px;
  height: 2px; background: var(--primary); border-radius: 2px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 30px; border-radius: 10px; font-size: 15px; font-weight: 600;
  transition: all .25s; cursor: pointer; border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
  color: #fff; box-shadow: 0 14px 26px -14px rgba(20,110,90,.6);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 30px -14px rgba(20,110,90,.78); filter: brightness(1.04); }
.btn-ghost {
  background: rgba(255,255,255,0.1); color: #fff; border: 1.5px solid rgba(255,255,255,0.45);
}
.btn-ghost:hover { background: rgba(255,255,255,0.2); border-color: #fff; }

/* ===== Hero（高度收缩）===== */
.hero { position: relative; overflow: hidden; background: var(--pine); color: #fff; }
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(95,214,170,0.42), transparent 60%),
    radial-gradient(900px 500px at 10% 110%, rgba(21,128,140,0.42), transparent 60%),
    linear-gradient(135deg, var(--pine) 0%, var(--emerald) 50%, var(--teal) 100%);
}
.hero-inner {
  position: relative; max-width: 1100px; margin: 0 auto;
  padding: 72px 24px 64px; text-align: center;
}
.hero-tag {
  display: inline-block; padding: 6px 16px; margin-bottom: 22px;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2);
  border-radius: 30px; font-size: 13px; color: rgba(255,255,255,0.78);
}
.hero-title {
  font-size: 52px; font-weight: 800; line-height: 1.18; letter-spacing: -1px; margin-bottom: 20px;
}
.hero-title .grad {
  background: linear-gradient(135deg, var(--mint-bright), var(--mint) 55%, #22d3ee);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc { font-size: 17px; color: rgba(255,255,255,0.78); max-width: 640px; margin: 0 auto 30px; line-height: 1.85; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 44px; justify-content: center; flex-wrap: wrap;
  margin-top: 52px; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.12);
}
.stat { text-align: center; }
.stat b { display: block; font-size: 30px; font-weight: 800; color: #fff; margin-bottom: 3px; }
.stat span { font-size: 13px; color: rgba(255,255,255,0.55); }

/* ===== 通用区块 ===== */
section { padding: 70px 24px; }
.section-head { max-width: 760px; margin: 0 auto 48px; text-align: center; }
.section-tag {
  display: inline-block; padding: 5px 14px; margin-bottom: 14px;
  background: rgba(28,107,84,0.08); color: var(--emerald);
  border-radius: 20px; font-size: 13px; font-weight: 600;
}
.section-title { font-size: 33px; font-weight: 800; color: var(--text-main); margin-bottom: 12px; letter-spacing: -.5px; }
.section-sub { font-size: 16px; color: var(--text-sub); }

/* ===== 功能卡片 ===== */
.feature-grid {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px;
}
.feature-card {
  background: #fff; border: 1px solid var(--border); border-radius: 16px;
  padding: 32px 24px; transition: all .3s; position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--grad-1), var(--grad-2));
  transform: scaleX(0); transform-origin: left; transition: transform .35s;
}
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 18px 40px rgba(14,58,43,0.10); border-color: transparent; }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 56px; height: 56px; border-radius: 13px; margin-bottom: 20px;
  display: flex; align-items: center; justify-content: center;
}
.feature-icon svg { width: 28px; height: 28px; }
/* 四种图标色：松绿/紫(AI)/薄荷(趋势)/琥珀(预算) — 与登录页色板呼应 */
.icon-1 { background: linear-gradient(135deg, rgba(14,58,43,0.12), rgba(28,107,84,0.04)); color: var(--emerald); }
.icon-2 { background: linear-gradient(135deg, rgba(102,126,234,0.14), rgba(118,75,162,0.06)); color: #764ba2; }
.icon-3 { background: linear-gradient(135deg, rgba(95,214,170,0.18), rgba(127,240,198,0.05)); color: #1c6b54; }
.icon-4 { background: linear-gradient(135deg, rgba(245,158,11,0.16), rgba(217,119,6,0.05)); color: #d97706; }
.feature-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.feature-card p { font-size: 14px; color: var(--text-sub); line-height: 1.75; margin-bottom: 18px; }
.feature-link { font-size: 14px; font-weight: 600; color: var(--emerald); }

/* ===== 工作流程 ===== */
.flow { background: var(--bg-soft); }
.flow-steps {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.step {
  background: #fff; border-radius: 14px; padding: 28px 22px; text-align: center;
  border: 1px solid var(--border); transition: transform .25s;
}
.step:hover { transform: translateY(-3px); }
.step-num {
  width: 46px; height: 46px; margin: 0 auto 16px; border-radius: 50%;
  background: linear-gradient(135deg, var(--emerald), var(--teal)); color: #fff;
  font-size: 16px; font-weight: 700; display: flex; align-items: center; justify-content: center;
}
.step h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: 13.5px; color: var(--text-sub); }

/* ===== 详情页页头（收缩）===== */
.page-hero {
  background: linear-gradient(135deg, var(--pine) 0%, var(--emerald) 60%, var(--teal) 100%);
  color: #fff; padding: 50px 24px 44px;
}
.page-hero-inner { max-width: 1100px; margin: 0 auto; }
.breadcrumb { font-size: 13px; color: rgba(255,255,255,0.55); margin-bottom: 16px; }
.breadcrumb a { color: rgba(255,255,255,0.55); } .breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { margin: 0 6px; }
.page-hero h1 { font-size: 36px; font-weight: 800; margin-bottom: 14px; letter-spacing: -.5px; }
.page-hero .page-desc { font-size: 16px; color: rgba(255,255,255,0.78); max-width: 700px; line-height: 1.8; }
.page-hero .page-tag {
  display: inline-block; padding: 5px 14px; margin-bottom: 16px;
  background: rgba(127,240,198,0.16); color: var(--mint-bright);
  border: 1px solid rgba(127,240,198,0.28); border-radius: 20px; font-size: 13px;
}

/* ===== 功能详情特性 ===== */
.detail { padding: 64px 24px; }
.detail-inner { max-width: 1100px; margin: 0 auto; }
.detail-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 50px;
}
.detail-item {
  background: #fff; border: 1px solid var(--border); border-radius: 14px;
  padding: 28px 24px; transition: all .25s;
}
.detail-item:hover { box-shadow: 0 10px 28px rgba(0,0,0,0.06); transform: translateY(-3px); }
.detail-item-icon {
  width: 46px; height: 46px; border-radius: 11px; margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--emerald), var(--teal)); color: #fff;
}
.detail-item-icon svg { width: 22px; height: 22px; }
.detail-item h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.detail-item p { font-size: 14px; color: var(--text-sub); line-height: 1.7; }

/* ===== 演示区 ===== */
.demo { background: var(--bg-soft); padding: 64px 24px; }
.demo-inner { max-width: 1100px; margin: 0 auto; }
.demo-mockup {
  background: #fff; border: 1px solid var(--border); border-radius: 16px;
  padding: 30px; box-shadow: 0 16px 44px rgba(0,0,0,0.07);
}
.demo-title { font-size: 17px; font-weight: 700; margin-bottom: 20px; color: var(--text-main); }

.mock-kpi { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 22px; }
.mock-kpi-item {
  background: linear-gradient(135deg, rgba(28,107,84,0.06), rgba(21,128,140,0.03));
  border: 1px solid rgba(28,107,84,0.12); border-radius: 10px; padding: 16px 14px; text-align: center;
}
.mock-kpi-item .v { font-size: 22px; font-weight: 800; color: var(--emerald); }
.mock-kpi-item .l { font-size: 12px; color: var(--text-muted); margin-top: 3px; }

.mock-chart-row { display: grid; grid-template-columns: 1.4fr 1fr; gap: 18px; }
.mock-chart-box { background: var(--bg-soft); border-radius: 10px; padding: 18px; }
.mock-chart-box h5 { font-size: 13px; font-weight: 600; margin-bottom: 14px; color: var(--text-sub); }
.mock-bars { display: flex; align-items: flex-end; gap: 12px; height: 140px; padding-top: 8px; }
.mock-bar { flex: 1; background: linear-gradient(180deg, var(--emerald), var(--teal)); border-radius: 5px 5px 0 0; position: relative; }
.mock-bar span { position: absolute; bottom: -20px; left: 0; right: 0; text-align: center; font-size: 11px; color: var(--text-muted); }
.mock-pie {
  width: 130px; height: 130px; border-radius: 50%; margin: 4px auto 14px;
  background: conic-gradient(var(--emerald) 0 38%, #667eea 38% 64%, var(--mint) 64% 82%, #f59e0b 82% 100%);
  box-shadow: 0 6px 18px rgba(14,58,43,0.10);
}
.mock-legend { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.mock-legend span { font-size: 12px; color: var(--text-sub); display: flex; align-items: center; gap: 5px; }
.mock-legend i { width: 9px; height: 9px; border-radius: 2px; display: inline-block; }

/* AI 对话演示 */
.mock-chat { max-width: 680px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.mock-msg-user {
  align-self: flex-end; max-width: 68%; background: linear-gradient(135deg, var(--emerald), var(--teal));
  color: #fff; padding: 11px 16px; border-radius: 16px 4px 16px 16px; font-size: 14px;
}
.mock-msg-ai {
  align-self: flex-start; width: 100%; background: #fff; border: 1px solid var(--border);
  border-radius: 13px; padding: 16px 20px; box-shadow: 0 4px 14px rgba(0,0,0,0.04);
}
.mock-msg-ai .ai-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.mock-ai-badge { background: linear-gradient(135deg, #667eea, #764ba2); color: #fff; width: 24px; height: 24px; border-radius: 6px; display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 800; }
.mock-msg-ai .ai-title { font-size: 12px; font-weight: 700; color: #764ba2; }
.mock-msg-ai .ai-summary { font-size: 14px; color: var(--text-main); line-height: 1.8; margin-bottom: 12px; }
.mock-msg-ai .ai-bars { display: flex; align-items: flex-end; gap: 16px; height: 110px; padding: 6px 0; }
.mock-msg-ai .ai-bar { flex: 1; border-radius: 5px 5px 0 0; position: relative; }
.mock-msg-ai .ai-bar span { position: absolute; bottom: -20px; left: 0; right: 0; text-align: center; font-size: 10px; color: var(--text-muted); }

/* 趋势演示 */
.mock-trend {
  background: #fff; border-radius: 10px; padding: 22px; border: 1px solid var(--border);
  height: 250px; position: relative; overflow: hidden;
}
.mock-trend svg { width: 100%; height: 100%; }

/* ===== 页脚（紧凑，仅备案号）===== */
.footer {
  background: var(--pine); color: rgba(255,255,255,0.78);
  padding: 32px 24px;
}
.footer-inner { max-width: 1100px; margin: 0 auto; text-align: center; }
.footer-beian { /* 简洁无 border */ }
.footer-beian p { font-size: 13px; color: rgba(255,255,255,0.55); margin-bottom: 4px; }
.footer-beian a { color: rgba(255,255,255,0.55); transition: color .2s; }
.footer-beian a:hover { color: var(--mint-bright); }
.beian-line { display: flex; gap: 4px; justify-content: center; flex-wrap: wrap; }
.beian-line a.icp-num {
  display: inline-block; padding: 4px 0;
  font-size: 13px; font-weight: 500; color: rgba(255,255,255,0.55); letter-spacing: .2px;
  border: none; border-radius: 0;
  transition: color .2s;
}
.beian-line a.icp-num:hover { color: var(--mint-bright); }

/* ===== 汉堡菜单按钮 ===== */
.hamburger {
  display: none;
  width: 36px; height: 36px; padding: 0; border: none; background: none; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--text-main);
  border-radius: 2px; transition: all .25s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .hero-title { font-size: 36px; }
  .section-title { font-size: 26px; }
  .page-hero h1 { font-size: 28px; }
  .feature-grid, .flow-steps, .detail-grid { grid-template-columns: 1fr; }
  .mock-kpi { grid-template-columns: repeat(2, 1fr); }
  .mock-chart-row { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
  section { padding: 50px 20px; }
  .detail { padding: 48px 20px; }
  .demo { padding: 48px 20px; }

  /* 手机端导航折叠 */
  .hamburger { display: flex; }
  .nav-links {
    position: fixed; top: 60px; left: 0; right: 0;
    background: rgba(255,255,255,0.98); backdrop-filter: blur(12px);
    flex-direction: column; gap: 0;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    max-height: 0; overflow: hidden; transition: max-height .3s ease;
  }
  .nav-links.open { max-height: 280px; }
  .nav-links a {
    display: block; padding: 14px 24px; font-size: 15px;
    border-bottom: 1px solid rgba(0,0,0,0.04);
  }
  .nav-links a.active::after { display: none; }
  .nav-links a.active { background: rgba(28,107,84,0.06); color: var(--emerald); font-weight: 600; }
}
@media (max-width: 600px) {
  .nav-inner { padding: 0 14px; }
  .logo-text { font-size: 17px; }
  .hero-title { font-size: 28px; }
  .hero-desc { font-size: 14px; }
  .hero-inner { padding: 50px 18px 46px; }
  .hero-btns .btn { width: 100%; }
  .page-hero { padding: 36px 18px 32px; }
  .page-hero h1 { font-size: 24px; }
}