/* ═══════════════════════════════════════════════
   TAC-SaaS Design v4.0 — 深色科技风
   完全颠覆旧视觉体系
   ═══════════════════════════════════════════════ */

:root {
  --bg:        #FAFAF9;
  --surface:   #FFFFFF;
  --border:    #E8E8E4;
  --primary:   #0066FF;
  --primary-l: #E6F0FF;
  --primary-d: #0044CC;
  --primary-g: linear-gradient(135deg, #0066FF 0%, #3399FF 100%);
  --success:   #00A86B;
  --success-l: #E6FFF0;
  --warning:   #F59E0B;
  --warning-l: #FFFBE6;
  --danger:    #EF4444;
  --danger-l:  #FFE6E6;
  --dark:      #0B1120;
  --dark-2:    #1A2332;
  --text:      #111827;
  --text-2:    #4B5563;
  --text-3:    #9CA3AF;
  --text-4:    #D1D5DB;
  --shadow:    0 2px 8px rgba(0,0,0,.06);
  --shadow-md: 0 8px 30px rgba(0,0,0,.08);
  --shadow-lg: 0 16px 50px rgba(0,0,0,.12);
  --shadow-xl: 0 24px 70px rgba(0,0,0,.16);
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
  --transition: .25s cubic-bezier(.4,0,.2,1);
}

/* ── Reset & Base ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{
  font-family:var(--font);font-size:16px;line-height:1.7;
  color:var(--text);background:var(--bg);-webkit-text-size-adjust:100%;
}
::selection{background:var(--primary);color:#fff}
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:#D1D5DB;border-radius:99px}

/* ── Typography ── */
h1{font-size:clamp(32px,6vw,56px);font-weight:800;letter-spacing:-.03em;line-height:1.15}
h2{font-size:clamp(22px,4vw,36px);font-weight:700;letter-spacing:-.02em}
h3{font-size:clamp(17px,2.5vw,22px);font-weight:600}
.text-muted{color:var(--text-3)}.text-sm{font-size:14px}.text-xs{font-size:12px}

/* ── Navbar ── */
.navbar{
  position:fixed;top:16px;left:50%;transform:translateX(-50%);
  z-index:50;background:var(--dark);border-radius:var(--radius-xl);
  padding:6px 8px;display:flex;align-items:center;gap:4px;
  box-shadow:0 8px 40px rgba(11,17,32,.25);
  border:1px solid rgba(255,255,255,.06);
  width:auto;max-width:calc(100vw - 32px);
}
.nav-brand{
  display:flex;align-items:center;gap:10px;padding:8px 16px 8px 12px;
  font-weight:700;font-size:17px;color:#fff;text-decoration:none;
}
.nav-logo{
  width:34px;height:34px;background:var(--primary-g);border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:16px;
}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  padding:8px 18px;border-radius:var(--radius-sm);font-size:14px;
  font-weight:500;color:rgba(255,255,255,.6);text-decoration:none;
  transition:all var(--transition);
}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.06)}
.nav-cta{
  margin-left:8px;background:var(--primary-g)!important;
  color:#fff!important;border-radius:var(--radius)!important;
  font-weight:600!important;
}
.nav-cta:hover{box-shadow:0 4px 20px rgba(0,102,255,.4)!important;background:rgba(255,255,255,.06)!important;color:#fff!important}
@media(max-width:768px){.nav-links a:not(.nav-cta){display:none}}

/* ── Hero ── */
.hero{
  padding:160px 24px 120px;text-align:center;
  background:var(--dark);color:#fff;position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;
  background:
    radial-gradient(circle at 30% 20%,rgba(0,102,255,.15),transparent 50%),
    radial-gradient(circle at 70% 60%,rgba(51,153,255,.1),transparent 40%);
  pointer-events:none;
}
.hero::after{
  content:'';position:absolute;bottom:0;left:0;right:0;height:200px;
  background:linear-gradient(180deg,transparent,var(--bg));
  pointer-events:none;
}
.hero-badge{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(0,102,255,.15);border:1px solid rgba(0,102,255,.3);
  padding:6px 16px;border-radius:99px;font-size:13px;font-weight:600;
  color:#66B3FF;margin-bottom:24px;
}
.hero h1{color:#fff;margin-bottom:20px;max-width:800px;margin-left:auto;margin-right:auto}
.hero h1 span{background:linear-gradient(135deg,#66B3FF,#3399FF,#0066FF);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:clamp(16px,2vw,20px);color:rgba(255,255,255,.55);max-width:600px;margin:0 auto 40px;line-height:1.7}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-demo{
  margin-top:60px;display:flex;justify-content:center;
}
.hero-demo img,.hero-demo .mock{
  max-width:900px;width:100%;border-radius:var(--radius-xl);
  box-shadow:0 20px 60px rgba(0,0,0,.4);
  border:1px solid rgba(255,255,255,.08);
}

/* ── Section ── */
.section{padding:100px 0}
.section-alt{background:var(--surface)}
.section-label{
  font-size:13px;font-weight:700;color:var(--primary);
  text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px;
}
.section-title{font-size:clamp(26px,4vw,38px);font-weight:800;margin-bottom:16px;letter-spacing:-.02em}
.section-desc{font-size:17px;color:var(--text-3);max-width:580px;margin:0 auto 60px;line-height:1.7}

/* ── Features ── */
.features-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:28px;
}
.feature-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:36px 32px;
  transition:all var(--transition);position:relative;overflow:hidden;
}
.feature-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:4px;
  background:var(--primary-g);opacity:0;transition:opacity var(--transition);
}
.feature-card:hover{
  border-color:var(--primary);
  box-shadow:var(--shadow-lg);
  transform:translateY(-4px);
}
.feature-card:hover::before{opacity:1}
.feature-icon{
  width:56px;height:56px;border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;
  font-size:28px;margin-bottom:20px;background:var(--primary-l);
}
.feature-card h3{font-size:19px;margin-bottom:10px;font-weight:700}
.feature-card p{font-size:15px;color:var(--text-2);line-height:1.7}

/* ── Stats bar ── */
.stats-bar{
  background:var(--dark);color:#fff;padding:64px 0;text-align:center;
}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:32px}
.stat-item .stat-num{font-size:clamp(32px,5vw,48px);font-weight:800}
.stat-item .stat-label{font-size:15px;color:rgba(255,255,255,.45);margin-top:4px}

/* ── Pricing ── */
.pricing-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:24px;max-width:1000px;margin:0 auto;
}
.pricing-card{
  background:var(--surface);border:2px solid var(--border);
  border-radius:var(--radius-xl);padding:40px 28px;text-align:center;
  transition:all var(--transition);position:relative;
}
.pricing-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.pricing-card.featured{
  background:var(--dark);border-color:transparent;color:#fff;
  box-shadow:0 16px 50px rgba(11,17,32,.25);
}
.pricing-card.featured::before{
  content:'最受欢迎';position:absolute;top:-14px;left:50%;transform:translateX(-50%);
  background:var(--primary-g);color:#fff;font-size:12px;font-weight:700;
  padding:5px 20px;border-radius:99px;box-shadow:0 4px 16px rgba(0,102,255,.3);
}
.pricing-name{font-size:20px;font-weight:700;margin-bottom:4px}
.pricing-card.featured .pricing-name{color:#fff}
.pricing-price{font-size:44px;font-weight:800;margin:12px 0 4px}
.pricing-card:not(.featured) .pricing-price{color:var(--primary)}
.pricing-card.featured .pricing-price{color:#66B3FF}
.pricing-price small{font-size:16px;font-weight:400;color:var(--text-3)}
.pricing-card.featured .pricing-price small{color:rgba(255,255,255,.4)}
.pricing-desc{font-size:14px;color:var(--text-3);margin-bottom:24px}
.pricing-card.featured .pricing-desc{color:rgba(255,255,255,.5)}
.pricing-features{list-style:none;text-align:left;margin-bottom:28px}
.pricing-features li{
  padding:10px 0;font-size:14px;color:var(--text-2);
  border-bottom:1px solid #F0F0F0;display:flex;align-items:center;gap:10px;
}
.pricing-card.featured .pricing-features li{color:rgba(255,255,255,.8);border-bottom-color:rgba(255,255,255,.08)}
.pricing-features li::before{content:'✓';color:var(--success);font-weight:800;flex-shrink:0}
.pricing-features li:last-child{border-bottom:none}

/* ── CTA ── */
.cta-section{
  background:var(--dark);padding:100px 0;text-align:center;
  position:relative;overflow:hidden;
}
.cta-section::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(circle at 50% 30%,rgba(0,102,255,.1),transparent 60%);
  pointer-events:none;
}
.cta-section h2{color:#fff;margin-bottom:12px}
.cta-section p{color:rgba(255,255,255,.45);font-size:17px;margin-bottom:36px}

/* ── Footer ── */
.footer{
  border-top:1px solid var(--border);padding:40px 0;
  background:var(--surface);
}
.footer-inner{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:20px;max-width:1200px;margin:0 auto;padding:0 24px;
}
.footer-copy{font-size:14px;color:var(--text-3)}
.footer-links{display:flex;gap:24px}
.footer-links a{font-size:14px;color:var(--text-3);transition:color var(--transition)}
.footer-links a:hover{color:var(--primary)}

/* ── Auth Pages ── */
.auth-page{
  min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:var(--dark);padding:40px 24px;position:relative;overflow:hidden;
}
.auth-page::before{
  content:'';position:absolute;inset:0;
  background:
    radial-gradient(circle at 20% 30%,rgba(0,102,255,.08),transparent 50%),
    radial-gradient(circle at 80% 70%,rgba(51,153,255,.05),transparent 40%);
  pointer-events:none;
}
.auth-card{
  background:var(--surface);border-radius:var(--radius-xl);
  box-shadow:var(--shadow-xl);width:100%;max-width:440px;
  padding:48px 36px;position:relative;z-index:1;
}
.auth-card .auth-logo{
  display:flex;justify-content:center;margin-bottom:8px;
}
.auth-card .auth-logo .nav-logo{width:48px;height:48px;font-size:22px}
.auth-card h1{font-size:26px;text-align:center;margin-bottom:6px}
.auth-card .auth-subtitle{text-align:center;color:var(--text-3);font-size:15px;margin-bottom:36px}
.auth-card .form-group{margin-bottom:20px}
.auth-card .form-group label{display:block;margin-bottom:6px;font-size:13px;font-weight:600;color:var(--text);letter-spacing:.02em}
.auth-card .form-input{
  width:100%;height:48px;padding:0 16px;font-family:var(--font);font-size:15px;
  color:var(--text);background:var(--bg);border:2px solid var(--border);
  border-radius:var(--radius);transition:all var(--transition);outline:none;
}
.auth-card .form-input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(0,102,255,.1);background:var(--surface)}
.auth-card .btn{margin-top:4px;height:50px;font-size:16px;font-weight:700}
.auth-footer{text-align:center;margin-top:24px;font-size:14px;color:var(--text-3)}
.auth-footer a{font-weight:600;color:var(--primary)}
.auth-footer span{color:var(--text-4)}

/* ── Buttons ── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font);font-weight:600;font-size:15px;
  border:2px solid transparent;border-radius:var(--radius);
  cursor:pointer;transition:all var(--transition);
  white-space:nowrap;outline:none;
}
.btn:active{transform:scale(.96)}
.btn-sm{height:36px;padding:0 16px;font-size:13px;border-radius:10px}
.btn-md{height:44px;padding:0 22px}
.btn-lg{height:52px;padding:0 30px;font-size:16px}
.btn-xl{height:58px;padding:0 38px;font-size:17px;border-radius:var(--radius-lg)}
.btn-block{width:100%}
.btn-primary{
  background:#fff;color:var(--dark);border-color:transparent;
  font-weight:700;box-shadow:0 4px 20px rgba(255,255,255,.15);
}
.btn-primary:hover{box-shadow:0 8px 32px rgba(255,255,255,.25);transform:translateY(-2px)}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.2)}
.btn-outline:hover{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.4)}
.btn-dark{background:var(--dark);color:#fff;border-color:transparent;box-shadow:0 4px 20px rgba(11,17,32,.2)}
.btn-dark:hover{box-shadow:0 8px 32px rgba(11,17,32,.3);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--text-2);border-color:transparent}
.btn-ghost:hover{background:var(--bg)}

/* ── Dashboard Layout ── */
.dash-layout{display:flex;min-height:100vh}
.dash-sidebar{
  width:250px;min-width:250px;background:var(--dark);color:#fff;
  display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;
  z-index:40;overflow-y:auto;transition:transform .3s ease;
  border-right:1px solid rgba(255,255,255,.04);
}
.dash-main{
  flex:1;margin-left:250px;min-width:0;
  display:flex;flex-direction:column;min-height:100vh;
  background:var(--bg);transition:margin-left .3s ease;
}
.dash-header{
  height:64px;display:flex;align-items:center;justify-content:space-between;
  padding:0 32px;background:var(--surface);border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:30;box-shadow:0 1px 3px rgba(0,0,0,.03);
}
.dash-content{flex:1;padding:28px 32px}
.dash-sidebar .sb-brand{display:flex;align-items:center;gap:10px;padding:20px 20px 16px;flex-shrink:0}
.dash-sidebar .sb-logo{width:36px;height:36px;background:var(--primary-g);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:16px}
.dash-sidebar .sb-title{font-size:15px;font-weight:700}
.dash-sidebar .sb-nav{flex:1;padding:8px 0;overflow-y:auto}
.dash-sidebar .sb-nav a{
  display:flex;align-items:center;gap:10px;padding:10px 16px;margin:3px 10px;
  border-radius:10px;font-size:13px;color:rgba(255,255,255,.5);font-weight:500;
  transition:all var(--transition);text-decoration:none;
}
.dash-sidebar .sb-nav a:hover{color:#fff;background:rgba(255,255,255,.05)}
.dash-sidebar .sb-nav a.active{color:#fff;background:var(--primary);box-shadow:0 4px 14px rgba(0,102,255,.3);font-weight:600}
.dash-sidebar .sb-nav a .nav-icon{width:18px;height:18px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:15px}
.dash-sidebar .sb-label{font-size:10px;font-weight:700;color:rgba(255,255,255,.15);text-transform:uppercase;letter-spacing:.12em;padding:8px 20px 4px}
.dash-sidebar .sb-divider{height:1px;background:rgba(255,255,255,.04);margin:6px 20px}
.dash-sidebar .sb-footer{padding:14px 20px;border-top:1px solid rgba(255,255,255,.04);font-size:11px;color:rgba(255,255,255,.12);flex-shrink:0}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:39;backdrop-filter:blur(4px)}
.sidebar-overlay.visible{display:block}
.menu-btn{display:none;width:38px;height:38px;border-radius:10px;border:none;background:transparent;cursor:pointer;font-size:22px;color:var(--text);align-items:center;justify-content:center}
.menu-btn:hover{background:var(--bg)}

/* ── Dashboard Components ── */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px;margin-bottom:28px}
.stat-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:24px 28px;
  box-shadow:var(--shadow);transition:all var(--transition);
  position:relative;overflow:hidden;
}
.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}
.stat-card .stat-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:14px}
.stat-card .stat-icon.blue{background:var(--primary-l);color:var(--primary)}
.stat-card .stat-icon.green{background:var(--success-l);color:var(--success)}
.stat-card .stat-icon.amber{background:var(--warning-l);color:var(--warning)}
.stat-card .stat-icon.red{background:var(--danger-l);color:var(--danger)}
.stat-card .stat-label{font-size:12px;color:var(--text-3);font-weight:600;margin-bottom:6px;text-transform:uppercase;letter-spacing:.06em}
.stat-card .stat-value{font-size:30px;font-weight:800;color:var(--text);font-variant-numeric:tabular-nums}
.stat-card .stat-sub{font-size:12px;color:var(--text-3);margin-top:6px}

/* ── Card ── */
.card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:28px;
  box-shadow:var(--shadow);transition:all var(--transition);
}
.card:hover{box-shadow:var(--shadow-md)}
.card-header{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;
  margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid var(--border);
}
.card-header h3{font-size:17px;font-weight:700}

/* ── Tables ── */
.data-table{width:100%;border-collapse:collapse;font-size:13px}
.data-table thead th{padding:12px 16px;text-align:left;font-weight:700;color:var(--text-2);background:var(--bg);border-bottom:2px solid var(--border);font-size:11px;text-transform:uppercase;letter-spacing:.06em;white-space:nowrap}
.data-table thead th:first-child{border-radius:var(--radius-sm) 0 0 0}
.data-table thead th:last-child{border-radius:0 var(--radius-sm) 0 0}
.data-table tbody td{padding:14px 16px;border-bottom:1px solid #F3F4F6;color:var(--text)}
.data-table tbody tr{transition:background var(--transition)}
.data-table tbody tr:hover{background:#F8FAFC}
.data-table tbody tr:last-child td{border-bottom:none}
.table-wrap{overflow-x:auto;border-radius:var(--radius-lg);border:1px solid var(--border)}

/* ── User menu ── */
.user-info{display:flex;align-items:center;gap:10px;padding:6px 14px;border-radius:var(--radius);cursor:pointer;font-size:13px;font-weight:500;transition:all var(--transition)}
.user-info:hover{background:var(--bg)}
.user-avatar{width:34px;height:34px;border-radius:50%;background:var(--primary-g);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0}
.user-dropdown{position:absolute;top:calc(100% + 6px);right:0;min-width:190px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);overflow:hidden;z-index:50;animation:popIn .2s ease}
.user-dropdown.hidden{display:none}
.user-dropdown-item{display:flex;align-items:center;gap:10px;padding:11px 18px;font-size:13px;color:var(--text);cursor:pointer;transition:all var(--transition)}
.user-dropdown-item:hover{background:var(--bg)}
.user-dropdown-item.danger{color:var(--danger)}
.user-dropdown-divider{height:1px;background:var(--border);margin:4px 0}

/* ── Toast ── */
.toast-container{position:fixed;top:28px;right:28px;z-index:9999;display:flex;flex-direction:column;gap:10px;pointer-events:none}
.toast-container>*{pointer-events:auto}
.toast{padding:14px 20px;border-radius:var(--radius);font-size:14px;font-weight:600;color:#fff;box-shadow:var(--shadow-lg);animation:toastIn .3s ease;min-width:220px}
.toast-success{background:var(--success)}
.toast-error{background:var(--danger)}
.toast-info{background:var(--primary)}

/* ── Loading ── */
.loading-state{display:flex;align-items:center;justify-content:center;gap:12px;padding:56px 0;color:var(--text-3);flex-direction:column}
.spinner{width:28px;height:28px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}
.empty-state{text-align:center;padding:64px 24px;color:var(--text-3)}
.empty-icon{font-size:56px;margin-bottom:20px;opacity:.35}
.empty-title{font-size:17px;font-weight:600;color:var(--text-2);margin-bottom:6px}
.empty-desc{font-size:14px;color:var(--text-3);margin-bottom:20px}

/* ── Badges ── */
.badge{display:inline-flex;align-items:center;gap:4px;height:24px;padding:0 12px;font-size:11px;font-weight:700;border-radius:99px;white-space:nowrap;letter-spacing:.02em}
.badge-primary{background:var(--primary-l);color:var(--primary)}
.badge-success{background:var(--success-l);color:var(--success)}
.badge-warning{background:var(--warning-l);color:var(--warning)}
.badge-danger{background:var(--danger-l);color:var(--danger)}
.badge-gray{background:#F3F4F6;color:var(--text-2)}

/* ── Chart ── */
.chart-wrap{position:relative;height:320px;width:100%;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;box-shadow:var(--shadow)}
.chart-wrap canvas{width:100%!important;height:100%!important}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}

/* ── Theme Toggle ── */
.theme-toggle{position:fixed;bottom:28px;right:28px;z-index:9999;width:48px;height:48px;border-radius:50%;background:var(--dark);border:none;box-shadow:0 4px 24px rgba(11,17,32,.3);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:22px;transition:all var(--transition)}
.theme-toggle:hover{transform:scale(1.1);box-shadow:0 8px 36px rgba(11,17,32,.4)}

/* ── Section title ── */
.section-title-inline{font-size:20px;font-weight:700;margin-bottom:24px}

/* ── Responsive ── */
@media(max-width:1024px){
  .dash-sidebar{transform:translateX(-100%)}
  .dash-sidebar.open{transform:translateX(0);box-shadow:var(--shadow-xl)}
  .dash-main{margin-left:0!important}
  .menu-btn{display:flex}
  .dash-header{padding:0 20px}
  .dash-content{padding:20px 16px}
  .grid-2{grid-template-columns:1fr}
}
@media(max-width:768px){
  .hero{padding:120px 20px 80px}.hero h1{font-size:28px}
  .section{padding:60px 0}
  .features-grid{grid-template-columns:1fr;gap:20px}
  .pricing-grid{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:1fr 1fr;gap:14px}
  .stat-card{padding:18px}
  .stat-card .stat-value{font-size:24px}
  .chart-wrap{height:250px}
  .auth-card{padding:32px 24px}
}
@media(max-width:540px){
  .stat-grid{grid-template-columns:1fr}
}

/* ── Legacy class aliases (兼容旧 admin JS 渲染) ── */
.modal{composes: modal-box}  /* n/a in plain CSS, inline equivalent below */
.dash-content .modal{background:var(--surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);width:100%;max-width:500px;max-height:85vh;overflow-y:auto;animation:popIn .25s ease}
.section-title{font-size:20px;font-weight:700;margin-bottom:24px}
.section-title .sub{font-size:14px;font-weight:400;color:var(--text-3);margin-left:8px}
.stat-card.primary .stat-value{color:var(--primary)}
.stat-card.success .stat-value{color:var(--success)}
.stat-card.warning .stat-value{color:var(--warning)}
.stat-card.info .stat-value{color:var(--primary)}
.stat-unit{font-size:14px;color:var(--text-3);margin-left:6px;font-weight:400}
.stat-change{font-size:12px;margin-top:4px}.stat-change.down{color:var(--danger)}.stat-change.up{color:var(--success)}
.loading{display:flex;align-items:center;justify-content:center;gap:12px;padding:56px 0;color:var(--text-3);flex-direction:column}
.loading .spinner{margin-bottom:4px}
.empty{text-align:center;padding:64px 24px;color:var(--text-3)}
.empty p{font-size:14px;margin:4px 0}
.empty .icon{font-size:48px;margin-bottom:16px;display:block;opacity:.35}
.skeleton-text{height:14px;background:linear-gradient(90deg,#E5E7EB 25%,#F3F4F6 37%,#E5E7EB 63%);background-size:200% 100%;animation:shimmer 1.5s ease infinite;border-radius:6px;margin-bottom:8px}
.btn-text{background:transparent;color:var(--primary);border:2px solid transparent;font-size:13px;padding:6px 10px;border-radius:8px;cursor:pointer;font-weight:500;transition:all var(--transition)}
.btn-text:hover{background:var(--primary-l)}
.badge-default{background:#F3F4F6;color:var(--text-2)}
.settings-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:28px;margin-bottom:20px;box-shadow:var(--shadow)}
.pool-gen-panel{display:flex;gap:16px;align-items:flex-end;flex-wrap:wrap;padding:20px 24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);margin-bottom:16px}
.mb-8{margin-bottom:8px}.mb-12{margin-bottom:12px}.mb-20{margin-bottom:20px}.mb-32{margin-bottom:32px}
.mt-12{margin-top:12px}.mt-20{margin-top:20px}.mt-40{margin-top:40px}.mt-48{margin-top:48px}
.p-16{padding:16px}.p-24{padding:24px}.p-32{padding:32px}
.text-danger{color:var(--danger)}
.font-medium{font-weight:500}.font-semibold{font-weight:600}.font-bold{font-weight:700}
@keyframes shimmer{0%{background-position:-200% 0}100%{background-position:200% 0}}
/* Pricing mini */
.pricing-mini-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.pricing-mini-card{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius-lg);padding:24px;text-align:center;cursor:pointer;transition:all var(--transition)}
.pricing-mini-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md)}

/* ── Animations ── */
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes toastIn{from{opacity:0;transform:translateX(100%)}to{opacity:1;transform:translateX(0)}}
@keyframes popIn{from{opacity:0;transform:scale(.95) translateY(-8px)}to{opacity:1;transform:scale(1) translateY(0)}}

/* ── Utility ── */
.hidden{display:none!important}
.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}
.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}
.flex{display:flex}.items-center{align-items:center}.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}
.text-center{text-align:center}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 28px}
@media(max-width:768px){.container{padding:0 16px}}
code{font-family:var(--font-mono);font-size:.85em;padding:3px 8px;background:#F3F4F6;border-radius:6px;color:var(--primary-d);word-break:break-all}