/* Physics Exams App - Modern Focus Theme */

/* CSS Custom Properties */
:root {
    /* Modern Focus Theme Colors (Indigo + Slate) */
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;

    --secondary-color: #64748b;
    --secondary-dark: #475569;

    --accent-color: #f59e0b;
    --background-color: #f8fafc;

    /* Neutral Colors */
    --white: #ffffff;
    --light-gray: #f1f5f9;
    --medium-gray: #e2e8f0;
    --dark-gray: #64748b;
    --darker-gray: #334155;
    --black: #0f172a;

    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    /* Typography */
    --font-primary: 'Cairo', system-ui, -apple-system, sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--black);
    background: var(--background-color);
    min-height: 100vh;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 800;
    line-height: 1.2;
    color: var(--black);
    letter-spacing: -0.025em;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
}

h3 {
    font-size: 1.25rem;
}

h4 {
    font-size: 1.125rem;
}

p {
    color: var(--secondary-color);
    font-weight: 500;
}

/* Layout */
.home-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.home-header {
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--medium-gray);
    margin-bottom: var(--spacing-xl);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text h1 {
    font-size: 1.5rem;
    margin-bottom: 0;
}

.logo-text p {
    font-size: 0.875rem;
    margin: 0;
}

.header-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--light-gray);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-lg);
    color: var(--secondary-color);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.header-btn:hover {
    background: var(--medium-gray);
    color: var(--black);
}

/* Main */
.home-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2xl);
}

/* User Entry Section */
.user-entry-section {
    width: 100%;
    display: flex;
    justify-content: center;
}

.user-entry-box {
    background: var(--white);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 500px;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.entry-header {
    margin-bottom: var(--spacing-lg);
}

.entry-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.entry-header h3 {
    color: var(--black);
    font-size: 1.25rem;
}

.user-entry-form {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.name-input {
    flex: 1;
    min-width: 200px;
    padding: var(--spacing-md);
    border: 2px solid var(--medium-gray);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: inherit;
    text-align: center;
    transition: all 0.2s ease;
}

.name-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.start-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
}

.start-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.start-btn:disabled {
    background: var(--medium-gray);
    color: var(--dark-gray);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.welcome-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(67, 56, 202, 0.05));
    border-radius: var(--radius-lg);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 1.1rem;
}

/* Section Title */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--black);
    font-size: 1.5rem;
}

/* Exam Selection */
.exam-selection {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.exam-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xl);
    width: 100%;
}

/* Exam Cards */
.exam-card {
    flex: 1 1 280px;
    max-width: 320px;
    background: var(--white);
    border: 2px solid var(--medium-gray);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.exam-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.exam-card.disabled {
    opacity: 0.6;
    pointer-events: none;
}

.exam-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.exam-icon {
    font-size: 2.5rem;
    background: var(--light-gray);
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
}

.exam-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.exam-badge.new {
    background: var(--accent-color);
    color: var(--black);
}

.exam-badge.completed {
    background: var(--success);
    color: var(--white);
}

.exam-title {
    color: var(--black);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.exam-description {
    color: var(--secondary-color);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.exam-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    color: var(--dark-gray);
    font-size: 0.8rem;
    font-weight: 500;
}

.exam-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
}

.exam-btn:hover {
    background: var(--primary-dark);
}

.exam-btn:disabled {
    background: var(--medium-gray);
    color: var(--dark-gray);
    cursor: not-allowed;
}

/* Results Section */
.results-section {
    width: 100%;
    max-width: 800px;
}

.results-box {
    background: var(--white);
    border: 2px solid var(--success);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.results-header {
    background: linear-gradient(135deg, var(--success), #059669);
    color: var(--white);
    padding: var(--spacing-lg);
    text-align: center;
}

.results-header h2 {
    color: var(--white);
    margin: 0;
}

.results-content {
    padding: var(--spacing-xl);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--light-gray);
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    font-weight: 600;
    color: var(--darker-gray);
}

.result-value {
    font-weight: 800;
    color: var(--primary-color);
    font-size: 1.25rem;
}

.result-score {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.05));
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--success), #059669);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: var(--white);
}

.score-value {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
}

.score-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* Footer */
.home-footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-top: auto;
    border-top: 1px solid var(--medium-gray);
    color: var(--secondary-color);
    font-size: 0.875rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(248, 250, 252, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--light-gray);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Mobile Responsive */
@media (max-width: 640px) {
    .logo-text h1 {
        font-size: 1.25rem;
    }

    .user-entry-box {
        padding: var(--spacing-lg);
    }

    .user-entry-form {
        flex-direction: column;
    }

    .name-input {
        width: 100%;
    }

    .start-btn {
        width: 100%;
        justify-content: center;
    }

    .exam-grid {
        flex-direction: column;
        align-items: center;
    }

    .exam-card {
        width: 100%;
        max-width: 100%;
    }

    .exam-info {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}