/* MLS Test 2026 Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ==========================================
   Design Tokens
   ========================================== */
:root {
    /* Colors - Light Mode */
    --color-primary: #0066cc;
    --color-primary-light: #3399ff;
    --color-primary-dark: #004c99;
    --color-secondary: #00a3a3;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-glass: rgba(255, 255, 255, 0.8);

    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* 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;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --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;

    /* Shadows */
    --shadow-sm: 0 1px 2px 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);

    /* Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ==========================================
   Base Styles
   ========================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #667eea 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

/* ==========================================
   Header
   ========================================== */
.mls-header {
    background: var(--color-bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--space-4) var(--space-6);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.mls-header-brand {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.mls-header-logo {
    height: 45px;
    width: auto;
}

.mls-header-divider {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, transparent, var(--color-primary), transparent);
}

.mls-header-user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: var(--color-bg-secondary);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
}

.mls-header-user-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.mls-header-user-name {
    font-weight: 600;
    color: var(--color-primary);
}

/* ==========================================
   Progress Bar
   ========================================== */
.mls-progress-container {
    background: var(--color-bg-glass);
    backdrop-filter: blur(12px);
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mls-progress-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.mls-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.mls-progress-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.mls-progress-text {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
}

.mls-progress-bar {
    height: 8px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.mls-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.mls-progress-steps {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-3);
}

.mls-progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.mls-progress-step-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-bg-tertiary);
    border: 2px solid var(--color-border);
    transition: all var(--transition-base);
}

.mls-progress-step.completed .mls-progress-step-dot {
    background: var(--color-success);
    border-color: var(--color-success);
}

.mls-progress-step.current .mls-progress-step-dot {
    background: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.2);
}

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

/* ==========================================
   Main Container
   ========================================== */
.mls-container {
    max-width: 900px;
    margin: var(--space-8) auto;
    padding: 0 var(--space-4);
}

/* ==========================================
   Card Component
   ========================================== */
.mls-card {
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.mls-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

.mls-card-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-2) 0;
    text-align: center;
}

.mls-card-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-align: center;
    margin: 0 0 var(--space-6) 0;
}

/* ==========================================
   Video Container
   ========================================== */
.mls-video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    /* 16:9 aspect ratio */
    margin-bottom: var(--space-6);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: #000;
}

.mls-video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.mls-video-caption {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-3);
    font-style: italic;
}

/* ==========================================
   PDF Viewer
   ========================================== */
.mls-pdf-wrapper {
    width: 100%;
    height: 600px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--space-6);
    background: #fff;
}

.mls-pdf-wrapper iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ==========================================
   Question Card
   ========================================== */
.mls-question {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    margin-bottom: var(--space-4);
    transition: all var(--transition-base);
}

.mls-question:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
}

.mls-question.answered-correct {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.05);
}

.mls-question.answered-incorrect {
    border-color: var(--color-error);
    background: rgba(239, 68, 68, 0.05);
}

.mls-question-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.mls-question-number {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-lg);
}

.mls-question-text {
    flex: 1;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-primary);
    line-height: 1.5;
    margin: 0;
}

.mls-options {
    display: grid;
    gap: var(--space-3);
}

.mls-option {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mls-option:hover {
    background: var(--color-bg-primary);
    border-color: var(--color-primary-light);
}

.mls-option input[type="radio"] {
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.mls-option label {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    user-select: none;
}

.mls-option.selected {
    background: rgba(0, 102, 204, 0.1);
    border-color: var(--color-primary);
}

.mls-option.correct {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--color-success);
}

.mls-option.incorrect {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--color-error);
}

.mls-feedback {
    display: none;
    margin-top: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.mls-feedback.show {
    display: block;
}

.mls-feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

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

/* ==========================================
   Form Elements
   ========================================== */
.mls-form-group {
    margin-bottom: var(--space-5);
}

.mls-form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.mls-form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.mls-form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

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

/* ==========================================
   Buttons
   ========================================== */
.mls-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: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.mls-btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: 0 4px 14px rgba(0, 102, 204, 0.3);
}

.mls-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.4);
}

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

.mls-btn-secondary {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
}

.mls-btn-secondary:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-primary);
}

.mls-btn-success {
    background: linear-gradient(135deg, var(--color-success), #059669);
    color: white;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.mls-btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.mls-btn-success:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.mls-btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
}

/* ==========================================
   Action Buttons Container
   ========================================== */
.mls-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-8);
}

.mls-warning-text {
    display: none;
    text-align: center;
    color: var(--color-error);
    font-size: var(--font-size-sm);
    font-style: italic;
    margin-bottom: var(--space-4);
}

.mls-warning-text.show {
    display: block;
}

/* ==========================================
   Registration Page Specific
   ========================================== */
.mls-registration-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    margin-top: var(--space-6);
}

.mls-registration-section {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
}

.mls-registration-section h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-4) 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.mls-registration-divider {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mls-registration-divider::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--color-border), transparent);
}

.mls-registration-or {
    background: var(--color-bg-glass);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-weight: 500;
    z-index: 1;
}

.mls-error-message {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--space-3);
    text-align: center;
}

.mls-error-message:empty {
    display: none;
}

/* ==========================================
   Intro Section
   ========================================== */
.mls-intro {
    text-align: center;
    margin-bottom: var(--space-6);
}

.mls-intro-text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 700px;
    margin: 0 auto;
}

.mls-intro-highlight {
    background: rgba(0, 102, 204, 0.1);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    font-weight: 500;
}

.mls-intro-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-8);
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

.mls-intro-stat {
    text-align: center;
}

.mls-intro-stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
}

.mls-intro-stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 768px) {
    .mls-header {
        padding: var(--space-3) var(--space-4);
    }

    .mls-header-logo {
        height: 35px;
    }

    .mls-header-divider {
        height: 30px;
    }

    .mls-card {
        padding: var(--space-6) var(--space-4);
    }

    .mls-card-title {
        font-size: var(--font-size-xl);
    }

    .mls-registration-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .mls-registration-divider {
        display: none;
    }

    .mls-actions {
        flex-direction: column;
    }

    .mls-btn {
        width: 100%;
    }

    .mls-intro-stats {
        flex-direction: column;
        gap: var(--space-4);
    }

    .mls-progress-steps {
        display: none;
    }

    .mls-pdf-wrapper {
        height: 400px;
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.mls-animate-in {
    animation: fadeIn 0.5s ease forwards;
}

.mls-card {
    animation: slideUp 0.6s ease forwards;
}