/* ==========================================================================
   Free CSH Schedule Maker - Master Design System
   Modern, Lightweight, Accessible, Mobile-First CSS
   Includes Day & Night (Light / Dark) Theme System
   ========================================================================== */

:root {
  /* Color Palette (Light Theme Default) */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  --color-primary-dark: #1e40af;
  
  --color-secondary: #4f46e5;
  --color-secondary-hover: #4338ca;
  --color-secondary-light: #eef2ff;

  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-subtle: #f1f5f9;
  --color-surface-hover: #e2e8f0;
  
  --color-text-main: #0f172a;
  --color-text-body: #334155;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-dark: #cbd5e1;

  /* Feedback Colors */
  --color-success: #10b981;
  --color-success-bg: #ecfdf5;
  --color-warning: #f59e0b;
  --color-warning-bg: #fffbeb;
  --color-danger: #ef4444;
  --color-danger-bg: #fef2f2;
  --color-info: #0284c7;
  --color-info-bg: #f0f9ff;

  /* Schedule Category Colors */
  --cat-work: #3b82f6;
  --cat-work-bg: #dbeafe;
  --cat-personal: #10b981;
  --cat-personal-bg: #d1fae5;
  --cat-meeting: #8b5cf6;
  --cat-meeting-bg: #ede9fe;
  --cat-study: #f59e0b;
  --cat-study-bg: #fef3c7;
  --cat-break: #06b6d4;
  --cat-break-bg: #cffafe;
  --cat-exercise: #ec4899;
  --cat-exercise-bg: #fce7f3;
  --cat-urgent: #ef4444;
  --cat-urgent-bg: #fee2e2;
  --cat-other: #64748b;
  --cat-other-bg: #f1f5f9;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Border Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.04);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --container-max: 1200px;
  --header-height: 72px;
}

/* ==========================================================================
   Dark Theme (Night Mode)
   ========================================================================== */
[data-theme="dark"] {
  --color-bg: #090d16;
  --color-surface: #111827;
  --color-surface-subtle: #1e293b;
  --color-surface-hover: #2d3748;
  
  --color-text-main: #f8fafc;
  --color-text-body: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-border: #243044;
  --color-border-dark: #374151;

  --color-primary-light: rgba(37, 99, 235, 0.2);
  --color-secondary-light: rgba(79, 70, 229, 0.2);

  --color-success-bg: rgba(16, 185, 129, 0.15);
  --color-warning-bg: rgba(245, 158, 11, 0.15);
  --color-danger-bg: rgba(239, 68, 68, 0.15);
  --color-info-bg: rgba(2, 132, 199, 0.15);

  --cat-work: #60a5fa;
  --cat-work-bg: rgba(59, 130, 246, 0.2);
  --cat-personal: #34d399;
  --cat-personal-bg: rgba(16, 185, 129, 0.2);
  --cat-meeting: #a78bfa;
  --cat-meeting-bg: rgba(139, 92, 246, 0.2);
  --cat-study: #fbbf24;
  --cat-study-bg: rgba(245, 158, 11, 0.2);
  --cat-break: #22d3ee;
  --cat-break-bg: rgba(6, 182, 212, 0.2);
  --cat-exercise: #f472b6;
  --cat-exercise-bg: rgba(236, 72, 153, 0.2);
  --cat-urgent: #f87171;
  --cat-urgent-bg: rgba(239, 68, 68, 0.2);
  --cat-other: #94a3b8;
  --cat-other-bg: rgba(100, 116, 139, 0.2);

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.6);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.7);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.8);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-body);
  background-color: var(--color-bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--color-bg);
  color: var(--color-text-body);
}

/* Accessibility Focus Ring */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip link for keyboard users */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 9999;
  transition: top var(--transition-fast);
  text-decoration: none;
}
.skip-link:focus {
  top: var(--space-4);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-main);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--space-3);
}

h1 { font-size: clamp(1.85rem, 3.5vw, 2.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 2.5vw, 1.875rem); letter-spacing: -0.01em; margin-top: var(--space-8); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p {
  margin-bottom: var(--space-4);
}

p.lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.main-content {
  flex: 1 0 auto;
  padding-bottom: var(--space-16);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-3);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text-main);
  font-weight: 700;
  font-size: 1.125rem;
  white-space: nowrap;
}
.site-logo:hover {
  text-decoration: none;
}
.logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: #ffffff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.25);
}
.logo-badge {
  font-size: 0.7rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  margin-left: var(--space-1);
}

/* Desktop Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: var(--space-1);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-body);
  font-weight: 500;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}
.nav-link:hover,
.nav-link.active {
  background-color: var(--color-surface-subtle);
  color: var(--color-primary);
  text-decoration: none;
}

/* Dropdown Menu */
.nav-dropdown {
  position: relative;
}
.dropdown-trigger {
  cursor: pointer;
  background: none;
  border: none;
  font: inherit;
}
.dropdown-trigger svg {
  transition: transform var(--transition-fast);
}
.nav-dropdown:hover .dropdown-trigger svg,
.nav-dropdown[data-open="true"] .dropdown-trigger svg {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  list-style: none;
  display: none;
  z-index: 110;
  animation: fadeIn 0.15s ease-out;
}
.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu,
.nav-dropdown[data-open="true"] .dropdown-menu {
  display: block;
}

.dropdown-item {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-body);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  text-decoration: none;
}
.dropdown-item:hover,
.dropdown-item.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  text-decoration: none;
}

/* Header Right Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Theme Toggle Button (Day / Night) */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.theme-toggle-btn:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-primary);
  transform: scale(1.05);
}

/* In Light Theme: show Moon (switch to Night) */
.theme-toggle-btn .sun-icon {
  display: none;
}
.theme-toggle-btn .moon-icon {
  display: block;
}

/* In Dark Theme: show Sun (switch to Day) */
[data-theme="dark"] .theme-toggle-btn .sun-icon {
  display: block;
  color: #f59e0b;
}
[data-theme="dark"] .theme-toggle-btn .moon-icon {
  display: none;
}

.nav-toggle-btn {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text-main);
  cursor: pointer;
}

/* Mobile Drawer */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(2px);
  z-index: 200;
  display: none;
}
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 85%;
  max-width: 340px;
  background-color: var(--color-surface);
  z-index: 210;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  padding: var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xl);
  overflow-y: auto;
}
.mobile-nav-drawer.open {
  transform: translateX(0);
}
.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.mobile-nav-item a {
  display: block;
  padding: var(--space-3) var(--space-3);
  color: var(--color-text-main);
  font-weight: 500;
  font-size: 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
}
.mobile-nav-item a:hover,
.mobile-nav-item a.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}
.mobile-nav-section-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-3) var(--space-1);
  font-weight: 700;
}

/* ==========================================================================
   Buttons & UI Elements
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.25;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}
.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text-body);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background-color: var(--color-surface-subtle);
  color: var(--color-text-main);
  border-color: var(--color-border-dark);
}

.btn-success {
  background-color: var(--color-success);
  color: #ffffff;
}
.btn-success:hover {
  background-color: #059669;
  color: #ffffff;
}

.btn-danger {
  background-color: var(--color-danger);
  color: #ffffff;
}
.btn-danger:hover {
  background-color: #dc2626;
  color: #ffffff;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-body);
}
.btn-ghost:hover {
  background-color: var(--color-surface-subtle);
  color: var(--color-text-main);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1.0625rem;
  border-radius: var(--radius-lg);
}

.btn-icon-only {
  padding: 0.5rem;
  border-radius: var(--radius-md);
}

/* Badges & Chips */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  line-height: 1.2;
}
.badge-primary { background: var(--color-primary-light); color: var(--color-primary); }
.badge-success { background: var(--color-success-bg); color: var(--color-success); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-danger { background: var(--color-danger-bg); color: var(--color-danger); }
.badge-muted { background: var(--color-surface-subtle); color: var(--color-text-muted); }

/* Form Controls */
.form-group {
  margin-bottom: var(--space-4);
}
.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: var(--space-1);
}
.form-label .required {
  color: var(--color-danger);
}
.form-control,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--color-text-main);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-control:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  outline: none;
}
.form-textarea {
  resize: vertical;
  min-height: 90px;
}
.form-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}
.form-error {
  font-size: 0.8rem;
  color: var(--color-danger);
  margin-top: var(--space-1);
  font-weight: 500;
  display: none;
}
.has-error .form-control {
  border-color: var(--color-danger);
}
.has-error .form-error {
  display: block;
}

/* Card Surface */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
  transition: box-shadow var(--transition-normal), background-color var(--transition-normal);
}
.card:hover {
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding-block: var(--space-10) var(--space-6);
  text-align: center;
}
.hero-badge-wrap {
  display: inline-flex;
  margin-bottom: var(--space-3);
}
.hero-trust-badge {
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.hero-title {
  margin-bottom: var(--space-3);
  max-width: 800px;
  margin-inline: auto;
}
.hero-lead {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-text-body);
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: var(--space-6);
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.hero-trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: var(--space-4);
}
.trust-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.trust-item svg {
  color: var(--color-success);
}

/* Quick Tools Grid */
.quick-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-block: var(--space-8);
}
.quick-tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}
.quick-tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}
.quick-tool-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}
.quick-tool-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: var(--space-1);
}
.quick-tool-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
  flex-grow: 1;
}

/* ==========================================================================
   Content & SEO Sections
   ========================================================================== */
.seo-section {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}
.seo-section-header {
  text-align: center;
  max-width: 760px;
  margin-inline: auto;
  margin-bottom: var(--space-8);
}
.seo-grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}
@media (min-width: 768px) {
  .seo-grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}
.seo-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.step-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.step-number {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}

/* FAQ Accordion */
.faq-list {
  max-width: 860px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}
.faq-item[open] {
  border-color: var(--color-primary);
}
.faq-summary {
  padding: var(--space-4) var(--space-5);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  user-select: none;
}
.faq-summary::-webkit-details-marker {
  display: none;
}
.faq-icon {
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}
.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}
.faq-content {
  padding: 0 var(--space-5) var(--space-5);
  color: var(--color-text-body);
  font-size: 0.95rem;
  line-height: 1.6;
}
.faq-content p:last-child {
  margin-bottom: 0;
}

/* Callout Box */
.callout-box {
  background-color: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-4) var(--space-5);
  margin-block: var(--space-6);
  font-size: 0.95rem;
}
.callout-box strong {
  color: var(--color-primary);
}

/* ==========================================================================
   Modals & Toasts
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(3px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}
.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}
.modal-dialog {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 540px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}
.modal-backdrop.open .modal-dialog {
  transform: scale(1);
}
.modal-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-title {
  font-size: 1.25rem;
  margin-bottom: 0;
}
.modal-body {
  padding: var(--space-6);
}
.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  background-color: var(--color-surface-subtle);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

/* Toast System */
.toast-container {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}
.toast {
  background-color: var(--color-surface);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.9rem;
  font-weight: 500;
  pointer-events: auto;
  animation: slideUp 0.25s ease-out;
  max-width: 360px;
}
.toast-success { border-left: 4px solid var(--color-success); }
.toast-error { border-left: 4px solid var(--color-danger); }
.toast-info { border-left: 4px solid var(--color-primary); }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: #0b1329;
  color: #94a3b8;
  border-top: 1px solid #1e293b;
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
  font-size: 0.9375rem;
}
[data-theme="dark"] .site-footer {
  background-color: #060911;
  border-top-color: #1e293b;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}
.footer-brand h3 {
  color: #ffffff;
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}
.footer-desc {
  color: #94a3b8;
  font-size: 0.875rem;
  margin-bottom: var(--space-4);
  line-height: 1.6;
}
.footer-trust-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.footer-trust-chips span {
  font-size: 0.75rem;
  background: #1e293b;
  color: #cbd5e1;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}
.footer-col h4 {
  color: #f8fafc;
  font-size: 1rem;
  margin-bottom: var(--space-4);
  font-weight: 600;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}
.footer-links a:hover {
  color: #ffffff;
  text-decoration: underline;
}
.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid #1e293b;
  text-align: center;
  font-size: 0.8125rem;
  color: #64748b;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 840px) {
  .main-nav {
    display: none;
  }
  .nav-toggle-btn {
    display: inline-flex;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .modal-dialog {
    margin: var(--space-2);
  }
}