/* ============================================
   MODERN THEME SYSTEM - Light & Dark Modes
   ============================================ */

:root {
    /* ===== LIGHT MODE COLORS ===== */
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-tertiary: #edf2f7;
    --bg-hover: #f1f5f9;
    
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --text-disabled: #a0aec0;
    
    --border-light: #e2e8f0;
    --border-medium: #cbd5e0;
    --border-dark: #a0aec0;
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    --overlay-light: rgba(0, 0, 0, 0.05);
    --overlay-medium: rgba(0, 0, 0, 0.1);
    --overlay-dark: rgba(0, 0, 0, 0.3);
    
    /* Semantic Colors */
    --success: #10b981;
    --success-light: rgba(16, 185, 129, 0.1);
    --success-dark: #059669;
    
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.1);
    --warning-dark: #d97706;
    
    --danger: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.1);
    --danger-dark: #dc2626;
    
    --info: #3b82f6;
    --info-light: rgba(59, 130, 246, 0.1);
    --info-dark: #2563eb;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Border Radius */
    --radius-xs: 0.25rem;
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --radius-full: 9999px;
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    --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;
    
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
}

/* ===== DARK MODE COLORS ===== */
[data-theme="dark"] {
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --bg-tertiary: #4a5568;
    --bg-hover: #374151;
    
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #cbd5e0;
    --text-disabled: #718096;
    
    --border-light: #4a5568;
    --border-medium: #718096;
    --border-dark: #a0aec0;
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
    
    --overlay-light: rgba(255, 255, 255, 0.05);
    --overlay-medium: rgba(255, 255, 255, 0.1);
    --overlay-dark: rgba(0, 0, 0, 0.5);
    
    --success-light: rgba(16, 185, 129, 0.2);
    --warning-light: rgba(245, 158, 11, 0.2);
    --danger-light: rgba(239, 68, 68, 0.2);
    --info-light: rgba(59, 130, 246, 0.2);
}

/* ===== SMOOTH THEME TRANSITIONS ===== */
* {
    transition: background-color var(--transition-base),
                border-color var(--transition-base),
                color var(--transition-base);
}

/* Disable transitions for theme toggle to avoid flash */
[data-theme-transitioning] * {
    transition: none !important;
}

/* ===== BASE STYLES ===== */
body {
    font-family: var(--font-family);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: var(--line-height-normal);
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-slower), color var(--transition-slower);
}

/* ===== ENHANCED CARDS ===== */
.card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--border-medium);
}

.card-elevated {
    box-shadow: var(--shadow-lg);
}

.card-elevated:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

/* ===== ENHANCED BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--overlay-medium);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Primary Button */
.btn-primary {
    background: linear-gradient(135deg, var(--school-primary-color, #0D5C63), var(--school-secondary-color, #FF9F1C));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    filter: brightness(1.05);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

/* Secondary Button */
.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-hover);
    border-color: var(--border-medium);
    transform: translateY(-1px);
}

/* Ghost Button */
.btn-ghost {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid transparent;
}

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

/* Danger Button */
.btn-danger {
    background-color: var(--danger);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

.btn-icon {
    padding: 0.5rem;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
}

/* ===== ENHANCED TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    letter-spacing: var(--letter-spacing-tight);
    margin: 0;
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

p {
    color: var(--text-secondary);
    margin: 0;
}

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

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

/* ===== DARK MODE TOGGLE BUTTON ===== */
.theme-toggle {
    position: relative;
    width: 3rem;
    height: 1.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    padding: 0.125rem;
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--border-medium);
    background-color: var(--bg-hover);
}

.theme-toggle-slider {
    width: 1.25rem;
    height: 1.25rem;
    background-color: var(--bg-primary);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .theme-toggle-slider {
    transform: translateX(1.5rem);
}

.theme-toggle-icon {
    transition: opacity var(--transition-fast);
}

.theme-toggle-icon.sun {
    opacity: 1;
}

.theme-toggle-icon.moon {
    opacity: 0;
    position: absolute;
}

[data-theme="dark"] .theme-toggle-icon.sun {
    opacity: 0;
}

[data-theme="dark"] .theme-toggle-icon.moon {
    opacity: 1;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
    }
}