/* ==========================================================================
   HappinessAsKPI Global CSS - Mobile-First, Accessible Design System
   ========================================================================== */

/* ==========================================================================
   1. CSS Custom Properties (Design Tokens)
   ========================================================================== */
:root {
    /* Brand Colors */
    --color-primary: #667eea;
    --color-secondary: #764ba2;
    --color-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Semantic Colors */
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* Grade Colors */
    --color-grade-a: #22c55e;
    --color-grade-b: #84cc16;
    --color-grade-c: #eab308;
    --color-grade-d: #f97316;
    --color-grade-f: #ef4444;

    /* Neutral Colors */
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;
    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e1;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing Scale */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;

    /* Z-Index Scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-tooltip: 400;

    /* Sidebar Width */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 64px;

    /* Touch Target Minimum (Accessibility) */
    --touch-target-min: 44px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   3. Accessibility
   ========================================================================== */

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100px;
    left: var(--space-4);
    background: var(--color-primary);
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus Styles */
:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000;
    }

    .form-input,
    .btn {
        border-width: 3px;
    }
}

/* ==========================================================================
   4. Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

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

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

a:hover {
    text-decoration: underline;
}

.text-muted {
    color: var(--color-text-muted);
}

.text-sm {
    font-size: var(--font-size-sm);
}

.text-xs {
    font-size: var(--font-size-xs);
}

/* ==========================================================================
   5. Layout Components
   ========================================================================== */

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* Grid System - Mobile First */
.grid {
    display: grid;
    gap: var(--space-4);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Responsive Grid */
@media (min-width: 640px) {
    .sm\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
    .sm\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Flex Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* ==========================================================================
   6. Card Component
   ========================================================================== */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.card-header {
    padding: var(--space-4) var(--space-6);
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border);
}

.card-body {
    padding: var(--space-6);
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    background: var(--color-background);
    border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   7. Form Elements
   ========================================================================== */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.form-label .required {
    color: var(--color-error);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    min-height: var(--touch-target-min);
}

.form-input:hover {
    border-color: var(--color-border-hover);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.form-input::placeholder {
    color: var(--color-text-light);
}

.form-input.error {
    border-color: var(--color-error);
}

.form-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

.form-error {
    font-size: var(--font-size-xs);
    color: var(--color-error);
    margin-top: var(--space-1);
}

/* Select */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
    cursor: pointer;
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    min-height: var(--touch-target-min);
}

.form-check-input {
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.form-check-label {
    font-size: var(--font-size-sm);
    cursor: pointer;
}

/* ==========================================================================
   8. Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-family: inherit;
    line-height: 1;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: var(--touch-target-min);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-gradient);
    color: white;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-background);
    border-color: var(--color-border-hover);
}

.btn-danger {
    background: var(--color-error);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-background);
    color: var(--color-text);
}

.btn-icon {
    padding: var(--space-2);
    min-width: var(--touch-target-min);
}

.btn-block {
    width: 100%;
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
    min-height: 52px;
}

/* ==========================================================================
   9. Alerts & Badges
   ========================================================================== */
.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #166534;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #b91c1c;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: #92400e;
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: #1e40af;
}

.alert-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-primary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--color-primary);
}

.badge-success {
    background: rgba(34, 197, 94, 0.1);
    color: var(--color-success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
}

.badge-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

/* Grade Badges */
.badge-grade-a { background: rgba(34, 197, 94, 0.15); color: var(--color-grade-a); }
.badge-grade-b { background: rgba(132, 204, 22, 0.15); color: var(--color-grade-b); }
.badge-grade-c { background: rgba(234, 179, 8, 0.15); color: var(--color-grade-c); }
.badge-grade-d { background: rgba(249, 115, 22, 0.15); color: var(--color-grade-d); }
.badge-grade-f { background: rgba(239, 68, 68, 0.15); color: var(--color-grade-f); }

/* ==========================================================================
   10. Navigation & Sidebar
   ========================================================================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 85%;
    max-width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: var(--z-modal);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
}

.sidebar.open {
    transform: translateX(0);
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-modal) - 1);
}

.sidebar.open ~ .sidebar-overlay,
body.sidebar-open .sidebar-overlay {
    display: block;
}

@media (min-width: 1024px) {
    .sidebar {
        width: var(--sidebar-width);
        transform: translateX(0);
    }

    .sidebar-overlay {
        display: none !important;
    }
}

.sidebar-header {
    padding: var(--space-4);
    background: var(--color-gradient);
}

.sidebar-brand {
    color: white;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    text-align: center;
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-4);
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    min-height: var(--touch-target-min);
}

.nav-item:hover {
    background: var(--color-background);
    color: var(--color-text);
    text-decoration: none;
}

.nav-item.active {
    background: rgba(102, 126, 234, 0.1);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.nav-item-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-group-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-4) var(--space-4) var(--space-2);
}

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--color-border);
}

/* Mobile Header */
.mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

@media (min-width: 1024px) {
    .mobile-header {
        display: none;
    }
}

.menu-toggle {
    padding: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
}

/* Main Content */
.main-content {
    padding: var(--space-4);
}

@media (min-width: 1024px) {
    .main-content {
        margin-left: var(--sidebar-width);
        padding: var(--space-8);
    }
}

/* ==========================================================================
   11. KPI Cards
   ========================================================================== */
.kpi-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.kpi-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-2);
}

.kpi-card-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
}

.kpi-card-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.kpi-card-value {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
}

.kpi-card-change {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-sm);
    margin-top: var(--space-2);
}

.kpi-card-change.positive {
    color: var(--color-success);
}

.kpi-card-change.negative {
    color: var(--color-error);
}

/* ==========================================================================
   12. Grade Distribution
   ========================================================================== */
.grade-card {
    text-align: center;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border-left: 4px solid;
}

.grade-card.grade-a {
    background: rgba(34, 197, 94, 0.1);
    border-color: var(--color-grade-a);
}

.grade-card.grade-b {
    background: rgba(132, 204, 22, 0.1);
    border-color: var(--color-grade-b);
}

.grade-card.grade-c {
    background: rgba(234, 179, 8, 0.1);
    border-color: var(--color-grade-c);
}

.grade-card.grade-d {
    background: rgba(249, 115, 22, 0.1);
    border-color: var(--color-grade-d);
}

.grade-card.grade-f {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--color-grade-f);
}

.grade-card-count {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
}

.grade-card.grade-a .grade-card-count { color: var(--color-grade-a); }
.grade-card.grade-b .grade-card-count { color: var(--color-grade-b); }
.grade-card.grade-c .grade-card-count { color: var(--color-grade-c); }
.grade-card.grade-d .grade-card-count { color: var(--color-grade-d); }
.grade-card.grade-f .grade-card-count { color: var(--color-grade-f); }

.grade-card-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* ==========================================================================
   13. Tables
   ========================================================================== */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.table th,
.table td {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.table th {
    background: var(--color-background);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    font-size: var(--font-size-xs);
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background: var(--color-background);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* ==========================================================================
   14. Chat Interface
   ========================================================================== */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 200px);
    min-height: 400px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.chat-message {
    display: flex;
    gap: var(--space-3);
    max-width: 80%;
}

.chat-message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.chat-message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-weight-semibold);
    flex-shrink: 0;
}

.chat-message.user .chat-message-avatar {
    background: var(--color-text-muted);
}

.chat-message-content {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    background: var(--color-background);
}

.chat-message.user .chat-message-content {
    background: var(--color-primary);
    color: white;
}

.chat-input-container {
    padding: var(--space-4);
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
}

.chat-input-wrapper {
    display: flex;
    gap: var(--space-2);
    align-items: flex-end;
}

.chat-input {
    flex: 1;
    resize: none;
    min-height: var(--touch-target-min);
    max-height: 120px;
}

/* Voice Button */
.btn-voice {
    position: relative;
    background: var(--color-background);
    border: 2px solid var(--color-border);
}

.btn-voice.listening {
    border-color: var(--color-error);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(239, 68, 68, 0); }
}

/* Quick Query Menus */
.quick-query-menu {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    margin-bottom: var(--space-4);
}

.quick-query-btn {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quick-query-btn:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* ==========================================================================
   15. Pricing Cards
   ========================================================================== */
.pricing-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border);
    padding: var(--space-8);
    text-align: center;
    position: relative;
    transition: all var(--transition-normal);
}

.pricing-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured::before {
    content: 'MOST POPULAR';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--color-gradient);
    color: white;
    padding: var(--space-1) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.05em;
}

.pricing-card-name {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
}

.pricing-card-description {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-6);
}

.pricing-card-price {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-1);
}

.pricing-card-period {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-6);
}

.pricing-card-features {
    text-align: left;
    margin-bottom: var(--space-8);
}

.pricing-card-feature {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    font-size: var(--font-size-sm);
}

.pricing-card-feature-icon {
    width: 16px;
    height: 16px;
    color: var(--color-success);
    flex-shrink: 0;
}

.pricing-card-feature.disabled {
    color: var(--color-text-light);
    text-decoration: line-through;
}

.pricing-card-feature.disabled .pricing-card-feature-icon {
    color: var(--color-text-light);
}

/* ==========================================================================
   16. Utility Classes
   ========================================================================== */

/* Spacing */
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

/* Text Alignment */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Display */
.hidden { display: none; }
.block { display: block; }

/* Width */
.w-full { width: 100%; }

/* Divider */
.divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-6) 0;
}

/* ==========================================================================
   17. Mobile-First Filter Bar
   ========================================================================== */
.filter-bar {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.filter-row {
    display: grid;
    gap: var(--space-3);
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .filter-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .filter-row {
        grid-template-columns: repeat(4, 1fr);
    }
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.filter-group label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.filter-actions {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-2);
}

@media (min-width: 640px) {
    .filter-actions {
        justify-content: flex-end;
    }
}

/* ==========================================================================
   18. Mobile-First Page Header
   ========================================================================== */
.page-header {
    margin-bottom: var(--space-6);
}

.page-header h1 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-2);
}

@media (min-width: 640px) {
    .page-header h1 {
        font-size: var(--font-size-2xl);
    }
}

@media (min-width: 1024px) {
    .page-header h1 {
        font-size: var(--font-size-3xl);
    }
}

.page-header-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-3);
}

/* ==========================================================================
   19. Mobile-First Stats Row
   ========================================================================== */
.stats-row {
    display: grid;
    gap: var(--space-3);
    grid-template-columns: repeat(2, 1fr);
    margin-bottom: var(--space-6);
}

@media (min-width: 640px) {
    .stats-row {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .stats-row {
        grid-template-columns: repeat(5, 1fr);
    }
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    text-align: center;
}

.stat-card-value {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
}

@media (min-width: 640px) {
    .stat-card-value {
        font-size: var(--font-size-xl);
    }
}

.stat-card-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* ==========================================================================
   20. Mobile-First KPI Grid
   ========================================================================== */
.kpi-grid {
    display: grid;
    gap: var(--space-4);
    grid-template-columns: 1fr;
    margin-bottom: var(--space-6);
}

@media (min-width: 480px) {
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .kpi-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Smaller KPI values on mobile */
.kpi-card-value {
    font-size: var(--font-size-2xl);
}

@media (min-width: 640px) {
    .kpi-card-value {
        font-size: var(--font-size-3xl);
    }
}

/* ==========================================================================
   21. Mobile-First Grade Distribution
   ========================================================================== */
.grade-grid {
    display: grid;
    gap: var(--space-2);
    grid-template-columns: repeat(5, 1fr);
    margin-bottom: var(--space-6);
}

/* Stack grades 3+2 on very small screens */
@media (max-width: 400px) {
    .grade-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.grade-card {
    padding: var(--space-3);
}

.grade-card-count {
    font-size: var(--font-size-lg);
}

@media (min-width: 640px) {
    .grade-card {
        padding: var(--space-4);
    }

    .grade-card-count {
        font-size: var(--font-size-2xl);
    }
}

/* ==========================================================================
   22. Mobile-First Table Enhancements
   ========================================================================== */
/* Responsive table with horizontal scroll */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: var(--space-4);
}

/* Mobile: Show scroll indicator */
.table-responsive::after {
    content: 'Scroll for more \2192';
    display: block;
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding: var(--space-2);
}

@media (min-width: 1024px) {
    .table-responsive::after {
        display: none;
    }
}

/* Ensure minimum table width for readability */
.table-responsive .table {
    min-width: 700px;
}

/* Mobile: Stacked card view for tables (optional) */
.table-card-view {
    display: none;
}

@media (max-width: 639px) {
    .table-card-view {
        display: block;
    }

    .table-desktop-view {
        display: none;
    }
}

.table-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    margin-bottom: var(--space-3);
}

.table-card-row {
    display: flex;
    justify-content: space-between;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--color-border);
}

.table-card-row:last-child {
    border-bottom: none;
}

.table-card-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
}

.table-card-value {
    font-weight: var(--font-weight-medium);
    text-align: right;
}

/* ==========================================================================
   23. Responsive Breakpoints Reference
   ==========================================================================
   Mobile: < 640px (base styles)
   Tablet: >= 640px (sm:)
   Desktop: >= 1024px (lg:)
   Wide: >= 1280px (xl:)
   ========================================================================== */