/* ========================================
   RunPower - 轮算力 紫红主题 v2.0
   移动优先设计 Mobile-First
   ======================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-mid: #93c5fd;
  --accent: #2563eb;
  --dark-900: #1e293b;
  --dark-800: #334155;
  --dark-700: #475569;
  --bg: #f5f7fa;
  --card: #ffffff;
  --border: #e8ecf1;
  --text: #1a2332;
  --text2: #5f6b7a;
  --text3: #9aa2af;
  --success: #34a853;
  --danger: #ea4335;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --max-w: 1200px;
}

*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { font-size: 16px; -webkit-text-size-adjust:100%; }
body {
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background: var(--bg); color: var(--text); line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a { color:var(--primary); text-decoration:none; }
img { max-width:100%; height:auto; }

h1,h2,h3 { font-weight:700; line-height:1.3; }
h1 { font-size:2rem; }
h2 { font-size:1.375rem; }
h3 { font-size:1.125rem; }

/* ===== Navigation ===== */
nav {
  background: var(--dark-900);
  position: sticky; top:0; z-index:1000;
  height: 56px;
}
.nav-inner {
  max-width: var(--max-w); margin:0 auto;
  display:flex; align-items:center; justify-content:space-between;
  height:100%; padding:0 16px;
}
.nav-logo {
  display:flex; align-items:center; gap:8px;
  color:#fff; font-size:1.125rem; font-weight:700;
}
.nav-logo .logo-icon {
  width:30px; height:30px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  border-radius:6px; display:flex; align-items:center; justify-content:center;
  font-size:0.875rem; font-weight:800; color:#fff;
}
.nav-links { display:none; }
.nav-links.active {
  display:flex; flex-direction:column;
  position:fixed; top:56px; left:0; right:0;
  background:var(--dark-900); padding:8px 0; gap:0;
  border-top:1px solid rgba(255,255,255,0.1);
  z-index:999;
}
.nav-links a {
  color:rgba(255,255,255,0.85); font-size:0.9375rem; font-weight:500;
  padding:14px 24px; border-bottom:1px solid rgba(255,255,255,0.05);
  position:relative;
}
.nav-links a.active { color:#fff; background:rgba(255,255,255,0.05); }
.nav-toggle {
  display:flex; flex-direction:column; gap:5px;
  background:none; border:none; cursor:pointer; padding:4px;
}
.nav-toggle span {
  width:24px; height:2.5px; background:#fff; border-radius:2px;
  transition:0.3s;
}
.nav-toggle.active span:nth-child(1) { transform:rotate(45deg) translate(5px,5px); }
.nav-toggle.active span:nth-child(2) { opacity:0; }
.nav-toggle.active span:nth-child(3) { transform:rotate(-45deg) translate(5px,-5px); }
.nav-right { display:flex; align-items:center; gap:8px; }

/* ===== Buttons ===== */
.btn {
  display:inline-flex; align-items:center; justify-content:center;
  padding:10px 20px; border-radius:var(--radius);
  font-weight:600; font-size:0.875rem; cursor:pointer; border:none;
  transition:all 0.2s; text-decoration:none; gap:6px; line-height:1.2;
  -webkit-tap-highlight-color:transparent;
}
.btn-primary { background:var(--primary); color:#fff; }
.btn-primary:hover { background:var(--primary-hover); }
.btn-outline { background:transparent; color:var(--text); border:1px solid var(--border); }
.btn-secondary { background:var(--bg); color:var(--text); border:1px solid var(--border); }
.btn-danger { background:var(--danger); color:#fff; }
.btn-success { background:var(--success); color:#fff; }
.btn-lg { padding:14px 28px; font-size:1rem; }
.btn-sm { padding:8px 14px; font-size:0.8125rem; }
.btn-block { width:100%; }
.btn:disabled { opacity:0.5; cursor:not-allowed; }
.btn-outline:hover { background:rgba(0,0,0,0.05); border-color:var(--text3); }
/* 深色背景上的描边按钮（导航栏、Hero 区）保留白色文字 */
nav .btn-outline, .hero .btn-outline { color:rgba(255,255,255,0.85); border-color:rgba(255,255,255,0.25); }
nav .btn-outline:hover, .hero .btn-outline:hover { background:rgba(255,255,255,0.15); border-color:rgba(255,255,255,0.35); }

/* ===== Cards ===== */
.card {
  background:var(--card); border-radius:var(--radius-lg);
  box-shadow:var(--shadow); border:1px solid var(--border);
  padding:20px;
}
.card-header { display:flex; justify-content:space-between; align-items:center; margin-bottom:12px; }
.card-header h3 { font-size:1rem; }

/* ===== Hero Section (Mobile First) ===== */
.hero {
  position:relative;
  background: linear-gradient(135deg, #1a0a14 0%, #2d0f20 40%, #3a1228 70%, #1f0f1a 100%);
  padding: 56px 16px 48px;
  text-align: center;
  overflow: hidden;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}


.hero-content {
  position: relative;
  z-index: 1;
}
.hero-content h1 { font-size:2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}
.hero-content h1 .highlight {
  color: #ffffff;
  background: linear-gradient(135deg, #7db3ff 0%, #60a5fa 45%, #ff9db8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.92);
  margin: 0 auto 28px;
  line-height: 1.7;
  max-width: 520px;
}
.cta-group {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}
.cta-group .btn { min-width: 160px; }

/* Hero 统计数据 *//* ===== Section ===== */
section { padding:40px 16px; }
.container { max-width:var(--max-w); margin:0 auto; padding:0 16px; }
.page-header { padding:24px 0 20px; }
.page-header h1 { font-size:1.375rem; }
.page-header p { color:var(--text2); font-size:0.875rem; margin-top:2px; }
.section-label {
  text-align:center; color:var(--text2); font-size:0.75rem; font-weight:600;
  text-transform:uppercase; letter-spacing:0.08em; margin-bottom:6px;
}
.section-heading { text-align:center; font-size:1.375rem; margin-bottom:24px; }
.section-title {
  font-size:1rem; font-weight:700; margin:32px 0 16px;
  padding-bottom:8px; border-bottom:1px solid var(--border);
}

/* ===== GPUs ===== */
.gpu-preview-card,.gpu-card {
  background:#fff; border:1.5px solid var(--border);
  border-radius:var(--radius-lg); padding:20px; text-align:center;
  cursor:pointer; transition:all 0.25s;
}
.gpu-card.selected { border-color:var(--primary); background:var(--primary-light); }
.gpu-card .gpu-icon { font-size:2rem; margin-bottom:8px; }
.gpu-card .gpu-name { font-size:0.9375rem; font-weight:700; }
.gpu-card .gpu-price { font-size:1.25rem; font-weight:700; color:var(--primary); margin-top:4px; }
.gpu-card .gpu-price small { font-size:0.75rem; font-weight:400; color:var(--text3); }
.gpu-card .gpu-stock { font-size:0.75rem; color:var(--text3); margin-top:6px; }
.gpu-label {
  display: inline-block;
  font-size: 0.625rem;
  font-weight: 600;
  color: #7f8c8d;
  background: #f0f0f0;
  padding: 1px 8px;
  border-radius: 10px;
  margin-top: 2px;
}

/* ===== Plan Cards ===== */
.plan-card {
  background:#fff; border:1.5px solid var(--border);
  border-radius:var(--radius-lg); padding:24px 20px; text-align:center;
  cursor:pointer; transition:all 0.25s; position:relative;
}
.plan-card.selected { border-color:var(--primary); background:var(--primary-light); }
.plan-card .badge-rec {
  position:absolute; top:-10px; right:-10px;
  background:var(--primary); color:#fff;
  font-size:0.625rem; font-weight:700; padding:3px 10px; border-radius:20px;
}
.plan-card .price-big { font-size:1.5rem; font-weight:700; color:var(--primary); }
.plan-card .price-big small { font-size:0.75rem; font-weight:400; color:var(--text3); }
.plan-card .per-hour { font-size:0.75rem; color:var(--success); font-weight:600; margin-top:4px; }
.plan-card .specs { font-size:0.8125rem; color:var(--text2); margin-top:10px; line-height:1.7; }

/* ===== Feature Cards ===== */
.feature-card {
  background:#fff; border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:24px 20px; text-align:center;
}
.feature-card .feature-icon {
  width:48px; height:48px; margin:0 auto 12px;
  background:linear-gradient(135deg,var(--primary-light),#fff);
  border-radius:12px; display:flex; align-items:center; justify-content:center;
  font-size:1.25rem;
}
.feature-card h3 { font-size:1rem; margin-bottom:6px; }
.feature-card p { font-size:0.8125rem; color:var(--text2); line-height:1.6; }

/* ===== Price Tag ===== */
.price-tag {
  display:inline-block; background:var(--primary-light); color:var(--primary);
  font-size:0.6875rem; font-weight:600; padding:2px 10px; border-radius:20px; margin-top:6px;
}

/* ===== Grids ===== */
.grid-2,.grid-3,.grid-4 {
  display:grid; grid-template-columns:1fr; gap:12px;
}

/* ===== Stats ===== */
.stat-card { padding:16px 20px; }
.stat-card .stat-value { font-size:1.5rem; font-weight:700; }
.stat-card .stat-label { font-size:0.75rem; color:var(--text2); }

/* ===== Badges ===== */
.badge {
  display:inline-flex; align-items:center;
  padding:2px 8px; border-radius:20px;
  font-size:0.6875rem; font-weight:600;
}
.badge-running { background:var(--success); color:#fff; }
.badge-stopped { background:var(--danger); color:#fff; }
.badge-recharge { background:var(--success); color:#fff; }
.badge-spend { background:var(--danger); color:#fff; }
.badge-warning { background:#fff3e0; color:#e65100; }
.badge-starting { background:#e3f2fd; color:#1565c0; }
.badge-expired { background:#f5f5f5; color:#9e9e9e; }

/* ===== Tables ===== */
.table-wrap { overflow-x:auto; }
table { width:100%; border-collapse:collapse; }
th,td {
  padding:10px 12px; text-align:left; border-bottom:1px solid var(--border);
  font-size:0.8125rem;
}
th { font-weight:600; color:var(--text2); font-size:0.6875rem; background:var(--bg); }

/* ===== Forms ===== */
input,select {
  width:100%; padding:10px 12px; border:1px solid var(--border);
  border-radius:var(--radius); font-size:0.9375rem; outline:none;
  -webkit-appearance:none; appearance:none;
}
input:focus { border-color:var(--primary); box-shadow:0 0 0 2px rgba(194,24,91,0.15); }
.form-group { margin-bottom:14px; }
.form-group label { display:block; margin-bottom:4px; font-weight:600; font-size:0.8125rem; }

/* ===== Alerts ===== */
.alert {
  padding:10px 14px; border-radius:var(--radius); margin-bottom:12px;
  font-size:0.8125rem;
}
.alert-error { background:#fce8e6; color:#c5221f; }
.alert-success { background:#e6f4ea; color:#1e7e34; }
.alert-info { background:var(--primary-light); color:var(--primary); }

/* ===== Loading ===== */
.loading { display:flex; align-items:center; justify-content:center; padding:32px; color:var(--text3); gap:8px; font-size:0.8125rem; }
.spinner { width:18px; height:18px; border:2.5px solid var(--border); border-top-color:var(--primary); border-radius:50%; animation:spin 0.7s linear infinite; }
@keyframes spin { to { transform:rotate(360deg); } }

/* ===== Empty State ===== */
.empty-state { text-align:center; padding:36px 16px; color:var(--text3); }
.empty-state .icon { font-size:2rem; margin-bottom:8px; }
.empty-state p { font-size:0.875rem; }

/* ===== Dashboard ===== */
.dashboard-layout { display:flex; flex-direction:column; min-height:calc(100vh - 56px); }
.dashboard-sidebar {
  width:100%; background:#fff; border-bottom:1px solid var(--border);
  display:flex; overflow-x:auto; padding:0; gap:0;
}
.dashboard-sidebar .sidebar-item {
  display:flex; align-items:center; gap:6px;
  padding:14px 20px; font-size:0.8125rem; font-weight:500;
  color:var(--text2); cursor:pointer; white-space:nowrap;
  border-bottom:3px solid transparent;
  transition:all .2s;
  border-radius:8px;
  margin:2px 0;
}
.dashboard-sidebar .sidebar-item.active {
  color:var(--primary); border-bottom-color:var(--primary);
  background:var(--primary-light);
}
.dashboard-sidebar .sidebar-item:hover { background:#f0f0f0; }
.dashboard-main { flex:1; padding:16px; overflow-x:hidden; }
.sidebar-user {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}

/* ===== Footer ===== */
.footer {
  background:var(--dark-900); color:rgba(255,255,255,0.78);
  text-align:center; padding:20px; font-size:0.75rem; margin-top:32px;
}

/* ===== Amount Grid ===== */
.amount-grid { display:flex; gap:6px; flex-wrap:wrap; }
.amount-grid .btn { flex:1; min-width:50px; font-size:0.8125rem; }

/* ===== Progress Steps ===== */
.progress-steps { display:flex; justify-content:center; gap:8px; flex-wrap:wrap; }
.progress-step { display:flex; align-items:center; gap:6px; padding:8px 16px; border-radius:8px; font-size:0.8125rem; background:#f5f5f5; color:var(--text2); }
.progress-step.active { background:var(--primary-light); color:var(--primary); font-weight:600; }
.progress-step.done { background:#e8f5e9; color:#2e7d32; }
.step-num { width:22px; height:22px; border-radius:50%; display:inline-flex; align-items:center; justify-content:center; font-size:0.75rem; font-weight:700; background:#e8ecf1; color:var(--text); }
.progress-step.active .step-num { background:var(--primary); }
.progress-step.done .step-num { background:#388e3c; }

/* ===== Misc ===== */
.flex-between { display:flex; justify-content:space-between; align-items:center; gap:12px; flex-wrap:wrap; }
.mt-8 { margin-top:8px; }
.mb-16 { margin-bottom:16px; }
.desktop-only { display:none; }

/* ===== Connection Dialog ===== */
.conn-dialog-overlay { position:fixed; inset:0; background:rgba(0,0,0,0.5); display:flex; align-items:center; justify-content:center; z-index:9999; }
.conn-dialog { background:#fff; border-radius:12px; max-width:640px; width:90%; max-height:80vh; overflow-y:auto; box-shadow:0 20px 60px rgba(0,0,0,0.2); }
.conn-dialog-header { display:flex; justify-content:space-between; align-items:center; padding:16px 20px; border-bottom:1px solid var(--border); }
.conn-dialog-header h3 { margin:0; font-size:1rem; }
.conn-dialog-body { padding:20px; }
.conn-table { width:100%; border-collapse:collapse; }
.conn-table td { padding:10px 8px; border-bottom:1px solid var(--border); font-size:0.8125rem; vertical-align:middle; }
.conn-table td:first-child { color:var(--text2); white-space:nowrap; width:80px; }
.conn-table code { background:#f5f5f5; padding:3px 8px; border-radius:4px; font-size:0.8125rem; word-break:break-all; display:inline-block; max-width:320px; }
.btn-xs { padding:2px 10px; font-size:0.75rem; border-radius:4px; cursor:pointer; }
.btn-close { background:none; border:none; font-size:1.5rem; cursor:pointer; color:var(--text3); padding:0 4px; line-height:1; }
.btn-close:hover { color:var(--text); }

/* ============================================
   TABLET (>= 640px)
   ============================================ */
@media (min-width: 640px) {
  .grid-2 { grid-template-columns:1fr 1fr; }
  .grid-3 { grid-template-columns:1fr 1fr 1fr; }
  .grid-4 { grid-template-columns:1fr 1fr; }
  .plan-card { padding:28px 24px; }
  .plan-card .price-big { font-size:1.75rem; }
  .dashboard-layout { flex-direction:row; }
  .dashboard-sidebar { width:200px; flex-direction:column; border-right:1px solid var(--border); border-bottom:none; }
  .dashboard-sidebar .sidebar-item { border-bottom:none; border-left:3px solid transparent; border-radius:0; margin:2px 0; }
  .dashboard-sidebar .sidebar-item.active { border-left-color:var(--primary); border-bottom:none; }
  .dashboard-main { padding:24px; }
  nav { height:64px; }
  .nav-inner { padding:0 24px; }
  .nav-logo { font-size:1.25rem; }
  .nav-toggle { display:none; }
  .nav-links { display:flex !important; flex-direction:row; gap:24px; position:static; background:none; border:none; padding:0; }
  .nav-links a { padding:0; font-size:0.875rem; border:none; }
  .nav-links a.active::after { content:''; position:absolute; bottom:-4px; left:0; right:0; height:2px; background:var(--primary); border-radius:1px; }
  .nav-links a.active { background:none; }
  .hero { padding: 72px 24px 56px; min-height: 480px; }
  .hero-content h1 { font-size:2.25rem; }
  .hero-subtitle { font-size:1rem; }
  section { padding:56px 24px; }
  .section-heading { font-size:1.5rem; }
  .desktop-only { display:block; }
}

/* ============================================
   DESKTOP (>= 1024px)
   ============================================ */
@media (min-width: 1024px) {
  .grid-4 { grid-template-columns:1fr 1fr 1fr 1fr; }
  .plan-card .price-big { font-size:2rem; }
  .hero { padding: 88px 24px 64px; min-height: 520px; }
  .hero-content h1 { font-size:2.75rem; }
  section { padding:64px 24px; }
  h1 { font-size:2rem; }
  .page-header h1 { font-size:1.625rem; }
  .stat-card .stat-value { font-size:1.75rem; }
  .gpu-card .gpu-price { font-size:1.375rem; }
  .card { padding:24px; }
}

/* ============================================
   Mobile Enhancements (< 640px)
   ============================================ */

/* 极小屏 (< 400px) */
@media (max-width: 399px) {
  html { font-size: 14px; }
  .hero { padding: 40px 12px 36px; min-height: 360px; }
  .hero-content h1 { font-size: 1.5rem; }
  .hero-subtitle { font-size: 0.875rem; }
  .cta-group .btn { width: 100%; min-width: auto; }
  .feature-card { padding: 18px 14px; }
  .gpu-preview-card, .gpu-card { padding: 14px 10px; }
  .gpu-preview-card .gpu-name, .gpu-card .gpu-name { font-size: 0.8125rem; }
  .gpu-preview-card .gpu-price, .gpu-card .gpu-price { font-size: 1rem; }
  .card { padding: 14px; }
  .page-header { padding: 16px 0; }
  .page-header h1 { font-size: 1.125rem; }
  section { padding: 28px 12px; }
  .container { padding: 0 10px; }
  table th, table td { padding: 8px 6px; font-size: 0.75rem; }
  .badge { font-size: 0.625rem; padding: 1px 6px; }
  .plan-card { padding: 16px 12px; }
  .plan-card .price-big { font-size: 1.25rem; }
  .stat-card .stat-value { font-size: 1.25rem; }
  .nav-inner { padding: 0 10px; }
  .nav-logo { font-size: 1rem; }
  .nav-logo .logo-icon { width: 26px; height: 26px; font-size: 0.75rem; }
  .nav-right { gap: 4px; }
  .btn { padding: 8px 14px; font-size: 0.8125rem; }
  .btn-sm { padding: 6px 10px; font-size: 0.75rem; }
  .btn-lg { padding: 12px 20px; font-size: 0.875rem; }
  .grid-2, .grid-3, .grid-4 { gap: 8px; }
  .section-heading { font-size: 1.125rem; margin-bottom: 16px; }
  .section-label { font-size: 0.6875rem; }
  .dashboard-sidebar .sidebar-item { padding: 10px 12px; font-size: 0.75rem; }
  .dashboard-main { padding: 10px; }
  .price-tag { font-size: 0.625rem; padding: 1px 8px; }
  .footer { font-size: 0.6875rem; padding: 16px 12px; }
  .amount-grid .btn { min-width: 40px; font-size: 0.75rem; padding: 6px 8px; }
  .form-group { margin-bottom: 10px; }
  input, select { padding: 8px 10px; font-size: 0.875rem; }
}

/* 手机 (400-639px) */
@media (min-width: 400px) and (max-width: 639px) {
  html { font-size: 15px; }
  .hero { padding: 48px 16px 40px; }
  .hero-content h1 { font-size: 1.625rem; }
  .cta-group .btn { min-width: 140px; }
  section { padding: 32px 16px; }
  .gpu-preview-card, .gpu-card { padding: 16px 12px; }
  .card { padding: 16px; }
  .plan-card { padding: 20px 16px; }
  .page-header h1 { font-size: 1.25rem; }
  .dashboard-main { padding: 12px; }
  .dashboard-sidebar .sidebar-item { padding: 12px 14px; }
  .container { padding: 0 12px; }
  .stat-card .stat-value { font-size: 1.375rem; }
  .grid-2, .grid-3, .grid-4 { gap: 10px; }
}

/* 触摸设备 */
@media (hover: none) and (pointer: coarse) {
  .btn, .nav-links a, .sidebar-item, .gpu-card, .plan-card {
    cursor: default;
    -webkit-tap-highlight-color: transparent;
  }
  .nav-links a { min-height: 48px; display: flex; align-items: center; }
  .sidebar-item { min-height: 44px; }
  .plan-card, .gpu-card { min-height: 120px; }
  .dashboard-sidebar .sidebar-item { min-height: 44px; }
}

/* 移动端横向滚动 & 紧凑布局 */
@media (max-width: 639px) {
  .table-wrap {
    margin: 0 -10px;
    padding: 0 10px;
  }
  .table-wrap table { min-width: 600px; }
  
  .dashboard-sidebar {
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .dashboard-sidebar::-webkit-scrollbar { display: none; }
  
  #instance-table-body .btn { 
    font-size: 0.6875rem !important;
    padding: 3px 6px !important;
  }
  
  #gpu-list .gpu-card .gpu-stock { font-size: 0.6875rem; }
  .progress-steps { gap: 4px; }
  .progress-step { padding: 6px 10px; font-size: 0.75rem; }
  .step-num { width: 18px; height: 18px; font-size: 0.6875rem; }
  
  #monthly-plans .plan-card .specs { font-size: 0.75rem; }
  #monthly-plans .plan-card .price-big { font-size: 1.375rem; }
  
  /* Dashboard 手机端 */
  .dashboard-sidebar { flex-wrap: nowrap; gap: 0; padding: 0; }
  .dashboard-sidebar .sidebar-item { padding: 10px 12px; font-size: 0.75rem; white-space: nowrap; }
  .dashboard-sidebar .sidebar-item .icon { font-size: 1rem; }
  .dashboard-main { padding: 10px; }
  .stat-card { padding: 12px; }
  .stat-card .stat-value { font-size: 1.25rem; }
  .stat-card .stat-label { font-size: 0.6875rem; }
  .sidebar-user { display: none; }
  .dashboard-layout { min-height: auto; }
  .card-header h3 { font-size: 0.875rem; }
  .card-header a { font-size: 0.75rem; }
  #recent-instances td { font-size: 0.75rem; padding: 8px 6px; }
  .conn-dialog { width: 95%; max-height: 90vh; }
  .conn-table td { font-size: 0.75rem; padding: 8px 6px; }
  .conn-table td:first-child { width: 60px; }
  .conn-table code { max-width: 160px; font-size: 0.6875rem; }
  #section-recharge .card { max-width: 100%; }
  #section-sshkeys .page-header { flex-direction: column; align-items: flex-start; gap: 8px; }
  #section-sshkeys .page-header .btn { width: 100%; }
  #ssh-keys-list table td { font-size: 0.6875rem; padding: 6px 4px; }
  #ssh-keys-list table code { font-size: 0.625rem; }
  .empty-state { padding: 24px 12px; }
  .empty-state .icon { font-size: 1.5rem; }
  .flex-between { flex-direction: column; align-items: flex-start; }
  .flex-between .btn { width: auto; }
  #section-instances .card { padding: 8px; }
  #section-instances .table-wrap { margin: 0 -8px; }
  #section-instances table { min-width: 700px; }
  #section-bills .card { padding: 12px; }
  #section-bills table { min-width: 400px; }
  .amount-grid .btn { min-width: 40px; font-size: 0.75rem; padding: 6px 8px; }
  #recharge-amount { font-size: 0.875rem; }
  #instance-table-body td[colspan="7"] .empty-state { padding: 16px 8px; }
  #instance-table-body td[colspan="7"] .empty-state .icon { font-size: 1.25rem; }
  
  /* 选购页手机紧凑 */
  #section-bills .card .flex-between div { flex: 1 1 45%; margin-bottom: 8px; }
  #section-bills .card .flex-between div strong { font-size: 1rem !important; }
}

/* 极小屏 Dashboard */
@media (max-width: 399px) {
  .dashboard-sidebar .sidebar-item { padding: 8px 8px; font-size: 0.6875rem; }
  .dashboard-sidebar .sidebar-item .icon { font-size: 0.875rem; }
  .dashboard-main { padding: 8px; }
  .stat-card { padding: 10px; }
  .stat-card .stat-value { font-size: 1.125rem; }
  #instance-table-body td { padding: 4px 3px; font-size: 0.625rem; }
  .page-header h1 { font-size: 1rem; }
  .conn-dialog-header { padding: 12px 14px; }
  .conn-dialog-body { padding: 12px; }
}

/* Toast */
#toast { 
  position:fixed; bottom:30px; left:50%; transform:translateX(-50%);
  background:#333; color:#fff; padding:10px 24px; border-radius:8px; 
  font-size:14px; z-index:10000; transition:opacity 0.3s; 
}
@media (max-width: 639px) {
  #toast { font-size: 0.8125rem !important; padding: 8px 16px !important; max-width: 90%; text-align: center; }
}

/* GPU 芯片 SVG 图标动画 */
.gpu-icon svg {
  transition: transform 0.3s ease;
}
.gpu-preview-card:hover .gpu-icon svg,
.gpu-card:hover .gpu-icon svg {
  transform: scale(1.15);
}

/* 导航汉堡按钮触控区扩大 */
.nav-toggle { padding: 8px; margin: -4px; }

/* 加载中骨架屏效果 */
.loading { min-height: 60px; }

/* 平板竖屏增强 */
@media (min-width: 640px) and (max-width: 1023px) {
  .gpu-preview-card, .gpu-card { padding: 22px 16px; }
  .card { padding: 20px; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .dashboard-main { padding: 20px; }
  section { padding: 48px 20px; }
  .hero-content h1 { font-size: 2rem; }
  .hero { padding: 60px 20px 48px; }
  .page-header h1 { font-size: 1.5rem; }
  .container { padding: 0 20px; }
  .plan-card .price-big { font-size: 1.5rem; }
}

/* 大屏桌面微调 */
@media (min-width: 1200px) {
  .gpu-preview-card:hover, .gpu-card:hover { 
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(194,24,91,0.12);
    border-color: var(--primary-mid);
  }
  .plan-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
  }
  .feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }
}

/* ===== Mobile Font Size Fix ===== */
@media (max-width: 639px) {
  body { font-size: 16px !important; }
  .hero-content h1 { font-size: 1.5rem !important; }
}
@media (max-width: 399px) {
  body { font-size: 14px !important; }
  .hero-content h1 { font-size: 1.5rem !important; }
}