@import url('https://fonts.googleapis.com/css2?family=Arima:wght@400;500;600;700&family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700&display=swap');

:root {
    /* Dark Theme (Default) */
    --background: #0b0c10;
    --surface: #13151a;
    --surface-hover: #1c2028;
    --border: rgba(255, 255, 255, 0.08);

    --primary: #3b82f6;
    /* Modern Blue */
    --primary-gradient: linear-gradient(135deg, #3b82f6, #2563eb);
    --primary-glow: rgba(59, 130, 246, 0.3);

    --secondary: #fb923c;
    /* Orange Highlight */
    --secondary-glow: rgba(251, 146, 60, 0.3);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;

    --success: #10b981;
    --warning: #ef4444;
    /* User requested Red for Warning */
    --accent: #0ea5e9;

    --radius: 20px;
    /* Large Rounded */
    --radius-sm: 12px;
    --radius-lg: 32px;

    --font-sans: 'Inter', 'Arima', sans-serif;
    /* Tamil Support */
    --font-display: 'Outfit', 'Arima', sans-serif;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --background: #f1f5f9;
    --surface: #ffffff;
    --surface-hover: #f8fafc;
    --border: rgba(0, 0, 0, 0.08);

    --text-primary: #0f172a;
    --text-secondary: #475569;

    --primary-glow: rgba(59, 130, 246, 0.15);
    --secondary-glow: rgba(251, 146, 60, 0.15);
}

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

body {
    background-color: var(--background);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
    text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 280px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}

.main-content {
    flex: 1;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 100vw;
    overflow-x: hidden;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
    gap: 0.6rem;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 8px 16px -4px var(--primary-glow);
}

.btn-primary:hover {
    background: #4f46e5;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 var(--primary-glow);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--surface-hover);
    border-color: var(--text-secondary);
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    transition: var(--transition);
    backdrop-filter: blur(12px);
}

.card:hover {
    border-color: var(--primary);
    box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.2);
    transform: translateY(-6px);
}

.card-title {
    font-size: 1.25rem;
    margin: 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
    transition: all 0.2s;
}

.nav-item:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.brand {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

/* ─── Global Utility Classes ───────────────────────────────────────────── */
.hidden { display: none !important; }
.text-center { text-align: center !important; }
.text-sm { font-size: 0.875rem !important; }
.text-secondary { color: var(--text-secondary) !important; }
.mt-4 { margin-top: 1rem !important; }

/* ─── Auth & Form Components ──────────────────────────────────────────── */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background-image: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.05) 0%, transparent 70%);
}

.auth-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 3rem;
    width: 100%;
    max-width: 480px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(20px);
}

.auth-title {
    font-size: 2.25rem;
    margin-bottom: 2rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 0.875rem 1.25rem;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    display: none;
    line-height: 1.4;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #f87171;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #34d399;
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 2rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.header-title {
    font-size: 1.75rem;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary);
}

/* Tablet (768px to 1100px) */
@media (min-width: 769px) and (max-width: 1100px) {
    .grid-cols-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .sidebar {
        width: 240px;
    }
}

/* Base Mobile Nav Classes */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(26, 28, 35, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
    z-index: 1000;
    padding: 0.75rem 1rem;
    justify-content: space-around;
    align-items: center;
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.75rem;
    gap: 0.25rem;
}

.mobile-nav-item.active {
    color: var(--primary);
}

.mobile-nav-item span.icon {
    font-size: 1.25rem;
}

/* Mobile (< 768px) */
@media (max-width: 768px) {
    body {
        padding-bottom: 80px;
        /* Space for bottom nav */
    }

    .app-layout {
        flex-direction: column;
    }

    .sidebar {
        display: none;
        /* Desktop sidebar hidden */
    }

    .mobile-nav {
        display: flex;
    }

    .main-content {
        padding: 1.25rem;
    }

    .grid-cols-2,
    .grid-cols-3 {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 1rem;
        /* Compact Cards */
    }

    .header-title {
        font-size: 1.25rem;
    }

    .topbar {
        padding-bottom: 1rem;
        margin-bottom: 1.5rem;
    }
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flex {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nested-item {
    margin: 1rem 0;
    background: var(--surface-hover);
    padding: 1rem;
    border-radius: var(--radius-sm);
}

.question-card {
    background: var(--surface);
    margin-top: 1rem;
}