/**
 * ============================================
 * TKA RESULT ANNOUNCEMENT SYSTEM
 * Modern Dashboard CSS - Pure CSS (No Framework)
 * ============================================
 * 
 * Author: Senior Frontend Engineer & UI Designer
 * Version: 2.0.0
 * Date: 2025
 * 
 * Design Philosophy:
 * - Modern & Professional
 * - Lightweight & Fast
 * - Easy to Maintain
 * - Accessible (WCAG Friendly)
 * - Mobile-First Responsive
 */

/* ============================================
   1️⃣ DESIGN TOKENS (CSS Variables)
   ============================================ */

:root {
    /* Primary Colors - Education Blue */
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --primary-hover: #1e40af;
    
    /* Status Colors */
    --success: #22c55e;
    --success-light: #4ade80;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Background Colors */
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --bg-tertiary: #f1f5f9;
    
    /* Text Colors */
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-secondary: #64748b;
    
    /* Border & Divider */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Border Radius */
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    
    /* Shadows */
    --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition: 0.2s ease-in-out;
    --transition-fast: 0.15s ease-in-out;
    --transition-slow: 0.3s ease-in-out;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    
    /* Typography */
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
}

/* ============================================
   🌙 DARK MODE DESIGN TOKENS
   ============================================ */

body.dark {
    /* Background Colors - Dark & Soft */
    --bg: #020617;
    --card-bg: #0f172a;
    --bg-tertiary: #1e293b;
    
    /* Text Colors - High Contrast but Comfortable */
    --text-main: #e5e7eb;
    --text-muted: #94a3b8;
    --text-secondary: #94a3b8;
    
    /* Primary Colors - Brighter for Dark Background */
    --primary: #3b82f6;
    --primary-dark: #1d4ed8;
    --primary-light: #60a5fa;
    --primary-hover: #2563eb;
    
    /* Status Colors - Adjusted for Dark Mode */
    --success: #22c55e;
    --success-light: #4ade80;
    --danger: #f87171;
    --warning: #fbbf24;
    --info: #60a5fa;
    
    /* Border & Divider - Subtle */
    --border-color: #1e293b;
    --border-light: #334155;
    
    /* Shadows - Deeper for Dark Mode */
    --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 15px 30px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 25px 50px rgba(0, 0, 0, 0.7);
}

/* ============================================
   🌓 SYSTEM PREFERENCE (Auto Dark Mode)
   ============================================ */

@media (prefers-color-scheme: dark) {
    /* Auto apply dark mode if system preference is dark */
    body:not(.light) {
        /* Background Colors - Dark & Soft */
        --bg: #020617;
        --card-bg: #0f172a;
        --bg-tertiary: #1e293b;
        
        /* Text Colors - High Contrast but Comfortable */
        --text-main: #e5e7eb;
        --text-muted: #94a3b8;
        --text-secondary: #94a3b8;
        
        /* Primary Colors - Brighter for Dark Background */
        --primary: #3b82f6;
        --primary-dark: #1d4ed8;
        --primary-light: #60a5fa;
        --primary-hover: #2563eb;
        
        /* Status Colors - Adjusted for Dark Mode */
        --success: #22c55e;
        --success-light: #4ade80;
        --danger: #f87171;
        --warning: #fbbf24;
        --info: #60a5fa;
        
        /* Border & Divider - Subtle */
        --border-color: #1e293b;
        --border-light: #334155;
        
        /* Shadows - Deeper for Dark Mode */
        --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.5);
        --shadow-md: 0 15px 30px rgba(0, 0, 0, 0.6);
        --shadow-lg: 0 25px 50px rgba(0, 0, 0, 0.7);
    }
}

/* ============================================
   2️⃣ GLOBAL STYLES & RESET
   ============================================ */

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Smooth Color Transitions for Dark Mode Toggle */
* {
    transition: background-color 0.2s ease, 
                color 0.2s ease, 
                border-color 0.2s ease,
                box-shadow 0.2s ease;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Focus Styles for Accessibility */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ============================================
   3️⃣ LAYOUT UTAMA
   ============================================ */

.dashboard-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg);
}

.dashboard-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.dashboard-content {
    flex: 1;
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-sm);
}

/* ============================================
   4️⃣ HEADER (Sticky)
   ============================================ */

.dashboard-header {
    background-color: var(--card-bg);
    padding: var(--spacing-sm) var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    min-height: var(--header-height);
}

.dashboard-header:hover {
    box-shadow: var(--shadow-md);
}

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

.header-logo {
    max-width: 50px;
    max-height: 50px;
    object-fit: contain;
    border-radius: var(--radius-sm);
    display: block;
}

.header-title h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-main);
    margin: 0;
    line-height: 1.2;
}

.header-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: 4px 0 0 0;
    font-weight: 500;
}

/* Logout Button */
.btn-logout {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 10px 20px;
    background-color: var(--bg-tertiary);
    color: var(--text-main);
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition);
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.btn-logout:hover {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-logout:active {
    transform: translateY(0);
}

.btn-logout svg {
    transition: transform var(--transition);
    flex-shrink: 0;
}

.btn-logout:hover svg {
    transform: translateX(2px);
}

/* ============================================
   5️⃣ CARD COMPONENT (Reusable)
   ============================================ */

.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--border-light);
}

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

.card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-main);
    margin: 0;
}

.card-body {
    /* Card body content */
}

/* ============================================
   6️⃣ WELCOME HERO CARD
   ============================================ */

.welcome-hero-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
    position: relative;
    overflow: hidden;
}

/* Pattern Background (CSS Only) */
.welcome-hero-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.3;
    pointer-events: none;
}

.welcome-hero-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.welcome-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.welcome-content {
    flex: 1;
    position: relative;
    z-index: 1;
}

.welcome-greeting {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.9);
    margin: 0 0 var(--spacing-xs) 0;
    font-weight: 500;
}

.welcome-name {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: white;
    margin: 0;
    line-height: 1.2;
}

/* ============================================
   7️⃣ INFORMASI SISWA (Info Grid)
   ============================================ */

.info-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--border-light);
}

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

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg);
    border-radius: var(--radius);
    transition: all var(--transition);
    border: 1px solid var(--border-light);
}

.info-item:hover {
    background: var(--bg-tertiary);
    transform: translateX(4px);
    border-color: var(--primary-light);
}

.info-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.info-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* Semantic HTML Support (dl, dt, dd) */
.info-label,
.info-content dt {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0;
}

.info-value,
.info-content dd {
    font-size: var(--font-size-lg);
    color: var(--text-main);
    font-weight: 600;
    line-height: 1.4;
    margin: 0;
}

/* ============================================
   8️⃣ STATUS KELULUSAN (Hidden - Not Used)
   ============================================ */

.status-card {
    display: none; /* Hidden as per requirements */
}

/* Status Badge Styles (for future use) */
.status-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-align: center;
}

.status-success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.status-failed {
    background: rgba(248, 113, 113, 0.15);
    color: var(--danger);
    border: 1px solid rgba(248, 113, 113, 0.3);
}

/* Dark Mode Status Badge Override */
body.dark .status-success {
    background: rgba(34, 197, 94, 0.2);
    border-color: rgba(34, 197, 94, 0.4);
}

body.dark .status-failed {
    background: rgba(248, 113, 113, 0.2);
    border-color: rgba(248, 113, 113, 0.4);
}

/* ============================================
   9️⃣ TKA RESULT CTA CARD
   ============================================ */

.tka-result-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
    border: 2px solid var(--border-light);
    text-align: center;
}

.tka-result-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.tka-result-disabled {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    opacity: 0.8;
}

.tka-card-content {
    max-width: 500px;
    margin: 0 auto;
}

.tka-icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-md);
}

.tka-result-disabled .tka-icon-wrapper {
    background: var(--text-muted);
}

.tka-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-main);
    margin: 0 0 var(--spacing-xs) 0;
}

.tka-description {
    font-size: var(--font-size-base);
    color: var(--text-muted);
    margin: 0 0 var(--spacing-lg) 0;
    line-height: 1.6;
}

/* Download Button */
.btn-download-tka {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: var(--font-size-lg);
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
}

/* Ripple Effect (CSS Only) */
.btn-download-tka::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-download-tka:hover::before {
    width: 300px;
    height: 300px;
}

.btn-download-tka:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary-dark) 100%);
}

.btn-download-tka:active {
    transform: translateY(0);
}

.btn-download-tka:disabled,
.btn-download-tka[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-download-tka svg {
    transition: transform var(--transition);
    flex-shrink: 0;
}

.btn-download-tka:hover svg {
    transform: translateY(2px);
}

/* ============================================
   🔟 ANIMATIONS
   ============================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* ============================================
   1️⃣1️⃣ LOGIN PAGE STYLES
   ============================================ */

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-sm);
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.login-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 1px;
}

.login-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--primary);
    margin: 0;
}

.login-form {
    margin-top: var(--spacing-lg);
}

.login-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--border-color);
}

.login-footer .success-message {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--success);
    margin-bottom: var(--spacing-sm);
}

.login-footer .copyright {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin: 0;
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-main);
    font-size: var(--font-size-sm);
}

.form-group input {
    width: 100%;
    padding: 12px var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: var(--font-size-base);
    transition: border-color var(--transition);
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.form-hint {
    display: block;
    margin-top: 6px;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px var(--spacing-md);
    border: none;
    border-radius: var(--radius);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background-color: var(--text-muted);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--text-main);
}

.btn-block {
    width: 100%;
}

.btn-large {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-lg);
}

/* Alerts */
.alert {
    padding: var(--spacing-sm) var(--spacing-sm);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

/* ============================================
   1️⃣2️⃣ DARK MODE SPECIFIC ADJUSTMENTS
   ============================================ */

/* Welcome Hero Card - Dark Mode */
body.dark .welcome-hero-card {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1e3a8a 100%);
}

body.dark .welcome-hero-card::before {
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    opacity: 0.2;
}

body.dark .welcome-icon {
    background: rgba(255, 255, 255, 0.15);
}

/* Info Card - Dark Mode */
body.dark .info-card {
    border-color: var(--border-color);
}

body.dark .info-item {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
}

body.dark .info-item:hover {
    background: #334155;
    border-color: var(--primary);
}

/* TKA Result Card - Dark Mode */
body.dark .tka-result-card {
    border-color: var(--border-color);
}

body.dark .tka-result-card:hover {
    border-color: var(--primary-light);
}

body.dark .tka-result-disabled {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
}

/* Header - Dark Mode */
body.dark .dashboard-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

/* Login Page - Dark Mode */
body.dark .login-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

body.dark .login-header {
    border-color: var(--border-color);
}

body.dark .login-footer {
    border-color: var(--border-color);
}

/* Form Elements - Dark Mode */
body.dark .form-group input {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-main);
}

body.dark .form-group input:focus {
    border-color: var(--primary);
    background-color: var(--card-bg);
}

body.dark .form-group input::placeholder {
    color: var(--text-muted);
}

/* Buttons - Dark Mode */
body.dark .btn-primary {
    background-color: var(--primary);
}

body.dark .btn-primary:hover {
    background-color: var(--primary-light);
}

body.dark .btn-secondary {
    background-color: var(--text-muted);
}

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

body.dark .btn-logout {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-main);
}

body.dark .btn-logout:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* Alerts - Dark Mode */
body.dark .alert-error {
    background-color: rgba(248, 113, 113, 0.15);
    color: #fca5a5;
    border-color: rgba(248, 113, 113, 0.3);
}

body.dark .alert-warning {
    background-color: rgba(251, 191, 36, 0.15);
    color: #fcd34d;
    border-color: rgba(251, 191, 36, 0.3);
}

body.dark .alert-success {
    background-color: rgba(34, 197, 94, 0.15);
    color: #86efac;
    border-color: rgba(34, 197, 94, 0.3);
}

body.dark .alert-info {
    background-color: rgba(96, 165, 250, 0.15);
    color: #93c5fd;
    border-color: rgba(96, 165, 250, 0.3);
}

/* ============================================
   🔘 DARK MODE TOGGLE BUTTON (Optional UI)
   ============================================ */

.dark-mode-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-main);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 18px;
    line-height: 1;
    position: relative;
    overflow: hidden;
}

.dark-mode-toggle:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.dark-mode-toggle:active {
    transform: translateY(0);
}

/* Icon via CSS Pseudo-element */
.dark-mode-toggle::before {
    content: '🌙';
    display: block;
    transition: opacity var(--transition), transform var(--transition);
}

body.dark .dark-mode-toggle::before {
    content: '☀️';
}

/* Smooth icon transition */
.dark-mode-toggle::before {
    opacity: 1;
    transform: rotate(0deg);
}

body.dark .dark-mode-toggle::before {
    opacity: 1;
    transform: rotate(180deg);
}

/* ============================================
   1️⃣3️⃣ RESPONSIVE DESIGN (Mobile-First)
   ============================================ */

/* Tablet & Below (max-width: 768px) */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 24px;
        --spacing-xl: 32px;
    }
    
    .dashboard-header {
        padding: var(--spacing-sm) var(--spacing-sm);
    }
    
    .header-title h1 {
        font-size: var(--font-size-lg);
    }
    
    .header-subtitle {
        font-size: var(--font-size-xs);
    }
    
    .header-logo {
        max-width: 40px;
        max-height: 40px;
    }
    
    .btn-logout {
        padding: 8px var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .btn-logout span {
        display: none;
    }
    
    .dashboard-content {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .welcome-hero-card {
        padding: var(--spacing-lg) var(--spacing-md);
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .welcome-icon {
        width: 64px;
        height: 64px;
    }
    
    .welcome-name {
        font-size: var(--font-size-2xl);
    }
    
    .welcome-greeting {
        font-size: var(--font-size-sm);
    }
    
    .info-card {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .info-item {
        padding: var(--spacing-sm);
    }
    
    .tka-result-card {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .tka-icon-wrapper {
        width: 64px;
        height: 64px;
    }
    
    .tka-title {
        font-size: var(--font-size-xl);
    }
    
    .tka-description {
        font-size: var(--font-size-sm);
    }
    
    .btn-download-tka {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-base);
    }
    
    .login-card {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
}

/* Mobile (max-width: 480px) */
@media (max-width: 480px) {
    .dashboard-header {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .header-brand {
        gap: var(--spacing-xs);
    }
    
    .header-title h1 {
        font-size: var(--font-size-base);
    }
    
    .welcome-hero-card {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .welcome-name {
        font-size: var(--font-size-xl);
    }
    
    .info-card {
        padding: var(--spacing-sm) var(--spacing-xs);
    }
    
    .card-title {
        font-size: var(--font-size-lg);
    }
    
    .info-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .info-icon {
        width: 40px;
        height: 40px;
    }
    
    .tka-result-card {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .tka-title {
        font-size: var(--font-size-lg);
    }
}

/* ============================================
   1️⃣4️⃣ PRINT STYLES
   ============================================ */

@media print {
    .dashboard-header,
    .btn-logout,
    .btn-download-tka {
        display: none;
    }
    
    .dashboard-content {
        max-width: 100%;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
        page-break-inside: avoid;
    }
}

/* ============================================
   END OF STYLESHEET
   ============================================ */