/* =============================================================
   黄色仓库 —— 仓储物流管理SaaS平台 全局样式
   采用 BEM + CSS 变量；支持响应式与暗黑模式扩展。
============================================================= */
:root{
  --primary:#1565C0; --secondary:#0D47A1;
  --bg:#ECEFF1; --card-bg:#FFFFFF; --accent:#1976D2;
  --text:#263238; --text-light:#546E7A; --text-inverse:#FFFFFF;
  --success:#2E7D32; --success-bg:#E8F5E9;
  --warning:#F57F17; --warning-bg:#FFFDE7;
  --danger:#C62828; --danger-bg:#FFEBEE; --info:#0277BD;
  --border:#CFD8DC; --border-light:#E0E0E0;
  --shadow-sm:0 1px 2px 0 rgba(0,0,0,.05);
  --shadow-md:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05);
  --radius:8px; --side-w:240px; --top-h:60px;
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
.font-mono{font-family:"Roboto Mono","Courier New",Courier,monospace}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--secondary)}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{color:var(--text);line-height:1.3;margin:0 0 .6em}
h1{font-size:2.4rem}h2{font-size:1.8rem}h3{font-size:1.3rem}
.container{max-width:1280px;margin:0 auto;padding:0 24px}
.btn{display:inline-block;padding:12px 24px;border-radius:var(--radius);font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:all .2s ease-in-out;text-align:center}
.btn--primary{background:var(--primary);color:var(--text-inverse)}
.btn--primary:hover{background:var(--secondary);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn--ghost{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn--ghost:hover{background:var(--primary);color:#fff}

/* ============ 顶部导航 ============ */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--border);box-shadow:var(--shadow-sm)}
.site-header__inner{display:flex;align-items:center;justify-content:space-between;height:var(--top-h)}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--secondary);font-size:1.15rem}
.brand__logo{width:32px;height:32px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:6px;display:inline-block}
.nav{display:flex;gap:24px;align-items:center}
.nav a{color:var(--text);font-weight:500}
.nav a:hover{color:var(--primary)}
.nav__cta{display:flex;gap:10px}
@media(max-width:900px){.nav{display:none}}

/* ============ Hero ============ */
.hero{position:relative;color:var(--text-inverse);
  background:linear-gradient(135deg,rgba(13,71,161,.92),rgba(21,101,192,.85)),url('/assets/images/hero.webp') center/cover no-repeat;
  padding:96px 0 120px;overflow:hidden}
.hero h1{color:#fff;font-size:3rem;max-width:900px}
.hero p.lead{font-size:1.2rem;max-width:760px;color:#E3F2FD;margin-bottom:32px}
.hero__ctas{display:flex;gap:16px;flex-wrap:wrap}
.hero .btn--ghost{color:#fff;border-color:#fff}
.hero .btn--ghost:hover{background:#fff;color:var(--secondary)}

/* ============ 通用 Section ============ */
.section{padding:80px 0}
.section--alt{background:#fff}
.section__head{text-align:center;max-width:760px;margin:0 auto 48px}
.section__head h2{font-size:2rem}
.section__head p{color:var(--text-light)}

/* ============ Features Grid ============ */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.feature-card{background:var(--card-bg);padding:28px;border-radius:var(--radius);border:1px solid var(--border-light);
  transition:transform .2s,box-shadow .2s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.feature-card__icon{width:48px;height:48px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.4rem;margin-bottom:16px}
.feature-card h3{font-size:1.15rem}
.feature-card p{color:var(--text-light);font-size:.95rem;margin:0 0 12px}

/* ============ Dashboard / KPI ============ */
.dashboard-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.kpi-card{background:var(--card-bg);padding:20px;border-radius:var(--radius);border:1px solid var(--border-light);box-shadow:var(--shadow-sm)}
.kpi-title{color:var(--text-light);font-size:.85rem;margin-bottom:8px}
.kpi-value{font-size:1.8rem;font-weight:700;color:var(--secondary)}
.kpi-trend{font-size:.85rem;margin-top:6px}
.kpi-trend.positive{color:var(--success)}
.kpi-trend.negative{color:var(--danger)}
.chart-container{background:var(--card-bg);padding:24px;border-radius:var(--radius);border:1px solid var(--border-light);min-height:280px}
.span-2-cols{grid-column:span 2}

/* ============ 表格 ============ */
.table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm)}
.table th,.table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border-light);font-size:.9rem}
.table th{background:#F5F7FA;color:var(--text-light);font-weight:600;text-transform:uppercase;font-size:.78rem;letter-spacing:.5px}
.table tr:hover td{background:#F5F7FA}
.tag{display:inline-block;padding:3px 10px;border-radius:12px;font-size:.78rem;font-weight:600}
.tag--success{background:var(--success-bg);color:var(--success)}
.tag--warning{background:var(--warning-bg);color:var(--warning)}
.tag--danger{background:var(--danger-bg);color:var(--danger)}

/* ============ 订单时间线 ============ */
.timeline{position:relative;padding-left:32px;margin:24px 0}
.timeline::before{content:'';position:absolute;left:10px;top:0;bottom:0;width:2px;background:var(--border)}
.timeline__item{position:relative;padding-bottom:24px}
.timeline__dot{position:absolute;left:-28px;top:2px;width:18px;height:18px;border-radius:50%;background:var(--primary);border:3px solid #fff;box-shadow:0 0 0 2px var(--primary)}
.timeline__item.is-active .timeline__dot{background:var(--accent);animation:pulse 1.6s infinite}
.timeline__item.is-done .timeline__dot{background:var(--success);box-shadow:0 0 0 2px var(--success)}
.timeline__title{font-weight:600;color:var(--text)}
.timeline__meta{font-size:.85rem;color:var(--text-light)}
@keyframes pulse{0%,100%{box-shadow:0 0 0 2px var(--accent)}50%{box-shadow:0 0 0 6px rgba(25,118,210,.3)}}

/* ============ 仓位可视化网格 ============ */
.bins{display:grid;grid-template-columns:repeat(20,1fr);gap:4px;background:#fff;padding:16px;border-radius:var(--radius);border:1px solid var(--border-light)}
.bin{aspect-ratio:1/1;background:rgba(21,101,192,.15);border:1px solid var(--border-light);border-radius:3px;cursor:pointer;transition:all .15s}
.bin:hover{transform:scale(1.15);z-index:2;box-shadow:var(--shadow-md)}
.bin.full{background:rgba(21,101,192,.95)}
.bin.high{background:rgba(21,101,192,.7)}
.bin.mid{background:rgba(21,101,192,.45)}
.bin.empty{background:transparent;border:1px dashed var(--border)}
.bin.alert{background:var(--danger);animation:blink 1.2s infinite}
@keyframes blink{50%{opacity:.5}}

/* ============ 代码块 ============ */
.code-block{background:#0D1B2A;color:#E0E1DD;padding:20px;border-radius:var(--radius);overflow:auto;font-family:"Roboto Mono",monospace;font-size:.9rem;line-height:1.55;position:relative}
.code-block .kw{color:#82AAFF}
.code-block .str{color:#C3E88D}
.code-block .com{color:#546E7A;font-style:italic}
.copy-btn{position:absolute;top:10px;right:10px;background:rgba(255,255,255,.1);color:#fff;border:none;padding:6px 12px;border-radius:4px;cursor:pointer;font-size:.78rem}
.copy-btn:hover{background:rgba(255,255,255,.2)}

/* ============ 后台布局 ============ */
.app-shell{display:grid;grid-template-columns:var(--side-w) 1fr;grid-template-rows:var(--top-h) 1fr;min-height:100vh;
  grid-template-areas:"side top" "side main"}
.app-side{grid-area:side;background:var(--secondary);color:#fff;padding:20px 0}
.app-side .brand{color:#fff;padding:0 20px 24px;border-bottom:1px solid rgba(255,255,255,.1)}
.app-side .brand{color:#fff}
.app-nav{display:flex;flex-direction:column;padding-top:12px}
.app-nav a{padding:11px 20px;color:#CFD8DC;border-left:3px solid transparent;font-size:.95rem}
.app-nav a:hover,.app-nav a.is-active{background:rgba(255,255,255,.08);color:#fff;border-left-color:var(--accent)}
.app-top{grid-area:top;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px}
.app-top__search{flex:1;max-width:520px;display:flex;align-items:center;background:var(--bg);padding:8px 14px;border-radius:6px;color:var(--text-light)}
.app-top__search input{flex:1;background:transparent;border:0;outline:0;font-size:.95rem;color:var(--text)}
.app-top__actions{display:flex;align-items:center;gap:18px;color:var(--text-light)}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:600}
.app-main{grid-area:main;padding:24px;overflow:auto}
@media(max-width:900px){.app-shell{grid-template-columns:1fr;grid-template-areas:"top" "main"}.app-side{display:none}}

/* ============ Footer ============ */
.site-footer{background:var(--secondary);color:#CFD8DC;padding:60px 0 24px;margin-top:80px}
.site-footer h4{color:#fff;font-size:1rem;margin-bottom:14px}
.footer-grid{display:grid;grid-template-columns:2fr repeat(4,1fr);gap:32px}
.footer-grid a{color:#B0BEC5;display:block;padding:4px 0;font-size:.9rem}
.footer-grid a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:20px;text-align:center;font-size:.85rem;color:#90A4AE}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}

/* ============ 工具 ============ */
.skeleton{background:linear-gradient(90deg,#ECEFF1 25%,#E0E0E0 50%,#ECEFF1 75%);background-size:200% 100%;animation:sk 1.5s infinite}
@keyframes sk{0%{background-position:200% 0}100%{background-position:-200% 0}}
.trust-row{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:center;margin-top:24px}
.trust-badge{padding:10px 18px;background:#fff;border:1px solid var(--border);border-radius:24px;color:var(--text-light);font-size:.85rem;font-weight:600}