/* ========================================
   FSHI Demo - 暗黑科技风主题 v2.0
   冷酷高冷科技风 · Dark Cyber Tech Aesthetic
   ======================================== */

:root {
  /* 背景 */
  --bg-deep: #06060e;
  --bg-surface: #0c0c1a;
  --bg-card: rgba(14, 14, 28, 0.85);
  --bg-card-hover: rgba(20, 20, 40, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-overlay: rgba(0, 0, 0, 0.7);

  /* 强调色 - 电光青 */
  --primary: #00e5ff;
  --primary-dim: rgba(0, 229, 255, 0.12);
  --primary-dark: #00b8d4;

  /* 辅助色 */
  --success: #00e676;
  --warning: #ffab00;
  --danger: #ff1744;
  --danger-dark: #d50000;
  --purple: #b388ff;

  /* 文字 */
  --text-primary: #e8eaed;
  --text-secondary: #9aa0b4;
  --text-muted: #5f6478;
  --text-white: #ffffff;

  /* 边框 */
  --border: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 229, 255, 0.2);
  --border-danger: rgba(255, 23, 68, 0.3);


  /* 圆角 */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;

  /* 间距 */
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  /* 字体 */
  --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Consolas", "Monaco", monospace;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 20px;
  --font-size-xxl: 28px;
  --font-size-title: 36px;
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--bg-deep);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 全局背景 - 干净无霓虹 */

/* ========================================
   Scrollbar
   ======================================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: rgba(0, 229, 255, 0.2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0, 229, 255, 0.4); }

/* ========================================
   Selection
   ======================================== */
::selection {
  background: rgba(0, 229, 255, 0.25);
  color: var(--text-white);
}

/* ========================================
   Breadcrumb
   ======================================== */
.breadcrumb {
  padding: var(--spacing-sm) 0;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  letter-spacing: 0.5px;
}
.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 6px; color: var(--text-muted); }
.breadcrumb .current { color: var(--text-primary); font-weight: 600; }

/* ========================================
   Navigation
   ======================================== */
.demo-nav {
  background: rgba(6, 6, 14, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 var(--spacing-lg);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.demo-nav .nav-brand {
  font-size: var(--font-size-lg);
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.demo-nav .nav-brand .logo-icon {
  width: 30px;
  height: 30px;
  background: var(--primary);
  color: var(--bg-deep);
  font-weight: 900;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.demo-nav .nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.demo-nav .nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 4px 0;
  position: relative;
  transition: color 0.3s;
}

.demo-nav .nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s;
}

.demo-nav .nav-links a:hover,
.demo-nav .nav-links a.active {
  color: var(--primary);
}

.demo-nav .nav-links a:hover::after,
.demo-nav .nav-links a.active::after {
  width: 100%;
}

.demo-nav .nav-cta {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
  padding: 6px 18px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.demo-nav .nav-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--primary);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: -1;
}

.demo-nav .nav-cta:hover {
  color: var(--bg-deep);
}

.demo-nav .nav-cta:hover::before {
  opacity: 1;
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: 0.3s;
}

/* ========================================
   Container
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ========================================
   Hero Section
   ======================================== */
.demo-hero {
  position: relative;
  padding: 80px 0 64px;
  text-align: center;
  overflow: hidden;
}

.demo-hero h1 {
  font-size: var(--font-size-title);
  font-weight: 900;
  letter-spacing: 3px;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.demo-hero p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  letter-spacing: 1px;
}

/* ========================================
   Cards
   ======================================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  border-color: rgba(255,255,255,0.12);
}

.card-header {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
  font-size: var(--font-size-sm);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-body { padding: var(--spacing-lg); }

/* === Scenario Cards === */
.scenario-card {
  cursor: pointer;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  transition: all 0.2s ease;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  background: var(--bg-card);
}

.scenario-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.scenario-card .industry-tag {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  font-size: var(--font-size-xs);
  background: rgba(0, 229, 255, 0.1);
  color: var(--primary);
  padding: 2px 10px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.scenario-card .risk-num {
  font-size: 42px;
  font-weight: 900;
  margin: var(--spacing-sm) 0;
  font-family: var(--font-mono);
  letter-spacing: -1px;
}
.scenario-card .risk-num.critical { color: var(--danger); }
.scenario-card .risk-num.warning { color: var(--warning); }
.scenario-card .risk-num.moderate { color: var(--primary); }

.scenario-card .scenario-name {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: 1px;
}

.scenario-card .scenario-meta {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
  font-family: var(--font-mono);
}

/* === Alert Cards === */
.alert-card {
  border-left: 3px solid var(--danger);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  background: rgba(255, 23, 68, 0.06);
  position: relative;
  transition: all 0.3s;
}

.alert-card:hover {
  background: rgba(255, 23, 68, 0.1);
  box-shadow: inset 0 0 30px rgba(255, 23, 68, 0.05);
}

.alert-card.critical {
  border-left-color: var(--danger);
}

.alert-card.warning {
  border-left-color: var(--warning);
  background: rgba(255, 171, 0, 0.05);
}

.alert-card .alert-type {
  font-size: var(--font-size-xs);
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.alert-card.critical .alert-type { color: var(--danger); }
.alert-card.warning .alert-type { color: var(--warning); }

.alert-card .alert-title {
  font-weight: 700;
  font-size: var(--font-size-base);
  color: var(--text-primary);
}

.alert-card .alert-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  border: none;
  transition: all 0.3s;
  text-decoration: none;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--primary);
  color: var(--bg-deep);
  font-weight: 800;
}

.btn-primary:hover {
  transform: translateY(-1px);
}

.btn-danger {
  background: var(--danger);
  color: var(--text-white);
  font-weight: 800;
}

.btn-danger:hover {
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-outline:hover {
  background: rgba(0, 229, 255, 0.08);
}

.btn-sm { padding: 6px 14px; font-size: var(--font-size-xs); letter-spacing: 1px; }
.btn-lg { padding: 14px 36px; font-size: var(--font-size-base); letter-spacing: 2px; }

/* ========================================
   Tags / Badges
   ======================================== */
.tag {
  display: inline-block;
  font-size: var(--font-size-xs);
  padding: 3px 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.tag-danger {
  background: rgba(255, 23, 68, 0.12);
  color: var(--danger);
  border: 1px solid rgba(255, 23, 68, 0.25);
}

.tag-warning {
  background: rgba(255, 171, 0, 0.1);
  color: var(--warning);
  border: 1px solid rgba(255, 171, 0, 0.25);
}

.tag-success {
  background: rgba(0, 230, 118, 0.1);
  color: var(--success);
  border: 1px solid rgba(0, 230, 118, 0.25);
}

.tag-primary {
  background: rgba(0, 229, 255, 0.1);
  color: var(--primary);
  border: 1px solid rgba(0, 229, 255, 0.25);
}

.tag-gray {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ========================================
   Modal
   ======================================== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(6px);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-overlay.show { display: flex; }

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 92%;
  padding: var(--spacing-xl);
  animation: fadeIn 0.3s ease;
}

.modal h3 {
  font-size: var(--font-size-xl);
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.modal p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
  font-size: var(--font-size-sm);
}

.modal ol {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 2;
}

.modal .modal-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

/* ========================================
   Dashboard Grids
   ======================================== */
.dashboard {
  display: grid;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg) 0;
}

.dashboard-2col { grid-template-columns: 1fr 1fr; }
.dashboard-3col { grid-template-columns: repeat(3, 1fr); }
.dashboard-full { grid-template-columns: 1fr; }

/* ========================================
   Tables
   ======================================== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.data-table th {
  background: rgba(255, 255, 255, 0.03);
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  border-bottom: 2px solid var(--border);
}

.data-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
}

.data-table tr:hover td { background: rgba(0, 229, 255, 0.03); }

/* ========================================
   Demo Disclaimer
   ======================================== */
.demo-disclaimer {
  margin-top: var(--spacing-xxl);
  padding: var(--spacing-lg);
  background: rgba(255, 171, 0, 0.05);
  border: 1px solid rgba(255, 171, 0, 0.15);
  font-size: var(--font-size-xs);
  color: var(--warning);
  line-height: 1.8;
  letter-spacing: 0.5px;
}

.demo-disclaimer strong {
  color: var(--warning);
  letter-spacing: 1px;
}

.demo-disclaimer a {
  color: var(--primary);
  text-decoration: none;
}

.demo-disclaimer a:hover { text-decoration: underline; }

/* Button mock annotation */
.demo-note {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  margin-left: var(--spacing-xs);
}

/* ========================================
   Feedback Bar
   ======================================== */
.feedback-bar,
.demo-feedback {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.feedback-bar .feedback-label,
.demo-feedback .feedback-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.feedback-bar .stars,
.demo-feedback .stars { display: flex; gap: 4px; }

.feedback-bar .star,
.demo-feedback .star {
  cursor: pointer;
  font-size: 22px;
  color: rgba(255, 255, 255, 0.08);
  transition: all 0.2s;
}

.feedback-bar .star:hover,
.feedback-bar .star.active,
.demo-feedback .star:hover,
.demo-feedback .star.active {
  color: var(--warning);
}

/* ========================================
   ROI Calculator
   ======================================== */
.roi-calculator { max-width: 680px; margin: 0 auto; }

.roi-slider-group { margin-bottom: var(--spacing-lg); }

.roi-slider-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: var(--font-size-sm);
  margin-bottom: 8px;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

.roi-slider-group label .slider-value {
  color: var(--primary);
  font-weight: 800;
  font-family: var(--font-mono);
  font-size: var(--font-size-base);
}

.roi-slider-group input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  border-radius: 2px;
}

.roi-slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--primary);
  cursor: pointer;
  transition: background 0.3s;
}

.roi-slider-group input[type="range"]::-webkit-slider-thumb:hover {
  background: var(--primary-dark);
}

/* ROI Result */
.roi-result {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.12), rgba(179, 136, 255, 0.08));
  border: 1px solid var(--border-glow);
  color: var(--text-primary);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-lg);
  text-align: center;
}

.roi-result .roi-big-num {
  font-size: 64px;
  font-weight: 900;
  line-height: 1.1;
  font-family: var(--font-mono);
}

.roi-result .roi-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  letter-spacing: 1px;
}

.roi-result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.roi-result-item { text-align: center; }

.roi-result-item .item-num {
  font-size: var(--font-size-xxl);
  font-weight: 800;
  font-family: var(--font-mono);
}

.roi-result-item .item-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.roi-preset-btns {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.roi-preset-btn {
  padding: 8px 18px;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: all 0.3s;
}

.roi-preset-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.roi-preset-btn.active {
  border-color: var(--primary);
  color: var(--bg-deep);
  background: var(--primary);
  font-weight: 800;
}

/* ========================================
   Risk Prediction Page
   ======================================== */
.risk-section { margin-bottom: var(--spacing-xl); }

.risk-section h3 {
  font-size: var(--font-size-lg);
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--primary);
  display: inline-block;
}

.chart-container {
  position: relative;
  width: 100%;
  height: 320px;
}

.chart-container.large { height: 420px; }

.chart-container canvas { width: 100% !important; }

.plain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: var(--spacing-lg);
}

.plain-card p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* ========================================
   Responsibility Chain
   ======================================== */
.responsibility-chain { margin-top: var(--spacing-lg); }

.chain-node {
  border-left: 2px solid var(--border);
  padding: var(--spacing-sm) var(--spacing-md);
  margin-left: var(--spacing-md);
  margin-bottom: 4px;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
}

.chain-node::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 14px;
  width: 10px;
  height: 10px;
  background: var(--bg-deep);
  border: 2px solid var(--border);
  transition: all 0.3s;
}

.chain-node:hover {
  border-left-color: var(--primary);
}

.chain-node:hover::before {
  border-color: var(--primary);
}

.chain-node .node-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.chain-node .node-expand {
  font-size: var(--font-size-xs);
  color: var(--primary);
  margin-left: auto;
  letter-spacing: 1px;
}

.chain-node .node-detail {
  display: none;
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(0, 229, 255, 0.03);
  border: 1px solid var(--border);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  line-height: 1.8;
}

.chain-node.expanded .node-detail { display: block; }
.chain-node.expanded {
  border-left-color: var(--primary);
}
.chain-node.expanded::before {
  border-color: var(--primary);
  background: var(--primary);
}

/* ========================================
   Password Gate
   ======================================== */
.password-gate {
  text-align: center;
  padding: 100px var(--spacing-lg);
}

.password-gate h2 {
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
  letter-spacing: 2px;
}

.password-gate input {
  padding: 12px 20px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-mono);
  width: 280px;
  text-align: center;
  outline: none;
  letter-spacing: 3px;
  transition: all 0.3s;
}

.password-gate input:focus {
  border-color: var(--primary);
}

.password-gate .gate-error {
  color: var(--danger);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-sm);
  letter-spacing: 1px;
  display: none;
}

/* ========================================
   Divider
   ======================================== */
.section-divider {
  width: 60px;
  height: 3px;
  background: var(--primary);
  margin: var(--spacing-xl) auto;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in { animation: fadeIn 0.4s ease; }
.pulse { animation: pulse 2s infinite; }
.slide-up { animation: slideUp 0.5s ease; }

/* ========================================
   Utilities
   ======================================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-success { color: var(--success); }
.text-primary { color: var(--primary); }
.text-mono { font-family: var(--font-mono); }
.text-glow { }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.hidden { display: none !important; }

/* ========================================
   Responsive - Tablet
   ======================================== */
@media (max-width: 1024px) {
  .dashboard-2col { grid-template-columns: 1fr; }
  .dashboard-3col { grid-template-columns: repeat(2, 1fr); }
  .container { padding: 0 var(--spacing-md); }
}

/* ========================================
   Mobile tabs - hidden on desktop, shown on mobile only
   ======================================== */
.mobile-tabs { display: none; }

/* ========================================
   Responsive - Mobile (Tab Scheme)
   ======================================== */
@media (max-width: 768px) {
  :root {
    --font-size-title: 26px;
    --font-size-xxl: 22px;
    --font-size-xl: 18px;
  }

  .demo-hero { padding: 60px 0 48px; }

  .demo-nav .nav-links { display: none; }

  .demo-nav .nav-links.show {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md);
  }

  .nav-toggle { display: block; }

  .dashboard-3col { grid-template-columns: 1fr; }
  .dashboard-2col { grid-template-columns: 1fr; }

  /* Mobile tabs */
  .mobile-tabs {
    display: flex !important;
    overflow-x: auto;
    gap: 4px;
    margin-bottom: var(--spacing-md);
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .mobile-tabs::-webkit-scrollbar { display: none; }

  .mobile-tab {
    flex: 0 0 auto;
    padding: 8px 16px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    white-space: nowrap;
    border: 1px solid var(--border);
    background: transparent;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.3s;
  }

  .mobile-tab.active {
    background: var(--primary);
    color: var(--bg-deep);
    border-color: var(--primary);
  }

  .mobile-tab-content { display: none; }
  .mobile-tab-content.active { display: block; }

  .roi-result-grid { grid-template-columns: 1fr; }
  .modal { padding: var(--spacing-lg); margin: var(--spacing-md); }
  .scenario-card .risk-num { font-size: 32px; }
  /* Force inline grids to single column */
  .mobile-stack { grid-template-columns: 1fr !important; }
  .mobile-stack-3 { grid-template-columns: 1fr !important; }
}

/* ========================================
   Line clamp for descriptions
   ======================================== */
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}