@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* Default Light Theme */
:root {
    --bg-main: #F8FAFC;
    --bg-card: #FFFFFF;
    --border-color: #E2E8F0;
    --input-bg: #FFFFFF;
    --input-focus-border: #3B82F6;
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --success: #10B981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --error: #EF4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --warning: #F59E0B;
    --warning-bg: rgba(245, 158, 11, 0.1);
    
    /* Quiz Specific */
    --quiz-unattempted: #94A3B8;
    --quiz-attempted: #10B981;
    --quiz-skipped: #F59E0B;
    --option-bg: #F1F5F9;
    --option-border: #CBD5E1;
    --option-selected: #DBEAFE;
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

/* Dark Theme overrides */
[data-theme="dark"] {
    --bg-main: #0B0F19;
    --bg-card: #131B2E;
    --border-color: #1E293B;
    --input-bg: #0F172A;
    --input-focus-border: #3B82F6;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    
    --quiz-unattempted: #475569;
    --quiz-attempted: #059669;
    --quiz-skipped: #D97706;
    --option-bg: #0F172A;
    --option-border: #1E293B;
    --option-selected: rgba(59, 130, 246, 0.2);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 800px;
}

.auth-card {
    max-width: 450px;
}

.dashboard-card {
    max-width: 900px;
}

/* Cards & Components */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, border-color 0.3s;
}

/* Headers */
.header {
    text-align: center;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    position: relative;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.logo span {
    color: var(--primary);
    background: linear-gradient(135deg, #3B82F6, #1D4ED8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}

h2 {
    font-weight: 600;
    font-size: 20px;
    margin-top: 8px;
}

/* Forms */
.form-group {
    margin-bottom: 18px;
    text-align: left;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

input, select {
    width: 100%;
    padding: 10px 14px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    outline: none;
    transition: all 0.2s;
}

input:focus, select:focus {
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 18px;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    accent-color: var(--primary);
}

.checkbox-group label {
    margin-bottom: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s, opacity 0.15s;
}

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

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

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

.btn-secondary {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

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

.btn-danger:hover:not(:disabled) {
    background-color: #DC2626;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 4px;
}

/* Messages */
.form-message {
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 16px;
    text-align: left;
}

.form-message.success {
    background-color: var(--success-bg);
    border: 1px solid var(--success);
    color: #34D399;
}

.form-message.error {
    background-color: var(--error-bg);
    border: 1px solid var(--error);
    color: #F87171;
}

.hidden {
    display: none !important;
}

/* Theme Toggle */
.theme-toggle {
    position: absolute;
    right: 0;
    top: 0;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 20px;
    padding: 8px;
}

/* Dashboard Specific Styles */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 14px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-badge {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
}

.welcome-banner {
    padding: 24px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(19, 27, 46, 0.1) 100%);
    border-radius: 8px;
    border: 1px solid rgba(59, 130, 246, 0.2);
    text-align: left;
    margin-bottom: 24px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 650px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

.grid-card {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    text-align: left;
}

/* QUIZ STYLES */
.quiz-tracker-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
}

.quiz-tracker {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.tracker-dot {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    color: white;
    cursor: pointer;
}

.tracker-dot.unattempted { background-color: var(--quiz-unattempted); }
.tracker-dot.attempted { background-color: var(--quiz-attempted); }
.tracker-dot.skipped { background-color: var(--quiz-skipped); }
.tracker-dot.current { outline: 2px solid var(--text-primary); outline-offset: 2px; }

.tracker-legend {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

.quiz-question-card {
    margin-bottom: 24px;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--text-secondary);
}

.difficulty-badge {
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 12px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
}

.question-text {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 24px;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-label {
    display: flex;
    align-items: center;
    padding: 16px;
    border: 1px solid var(--option-border);
    border-radius: 8px;
    background-color: var(--option-bg);
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.option-label:hover {
    border-color: var(--primary);
}

.option-label input[type="radio"] {
    width: auto;
    margin-right: 12px;
    accent-color: var(--primary);
}

.option-label.selected {
    background-color: var(--option-selected);
    border-color: var(--primary);
}

.quiz-footer {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.quiz-footer > div {
    display: flex;
    gap: 12px;
}

/* File Upload Specific */
input[type="file"] {
    padding: 8px;
}

.auth-redirect {
    margin-top: 18px;
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
}

.auth-redirect a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.auth-redirect a:hover {
    text-decoration: underline;
}