/* Base Variables */
:root {
    /* Colors - Dark Theme (Default) */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    
    /* Glassmorphism setup */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    
    /* Other vars */
    --border-radius: 16px;
    --transition: all 0.3s ease;
    --font-main: 'Inter', sans-serif;
}

[data-theme="light"] {
    --bg-primary: #f1f5f9;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-main);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: var(--transition);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.1) 0px, transparent 50%);
    background-attachment: fixed;
}

/* Utilities */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    box-shadow: var(--glass-shadow);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-primary);
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--glass-shadow);
}

.theme-toggle:hover {
    transform: scale(1.1);
}

/* Landing Page Styles */
.landing-body {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.landing-container {
    max-width: 900px;
    width: 100%;
    padding: 3rem;
    text-align: center;
}

.landing-header {
    margin-bottom: 3rem;
}

.logo-icon {
    font-size: 4rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

.landing-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, var(--accent-primary), var(--accent-success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.landing-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.portal-cards {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.portal-card {
    flex: 1;
    min-width: 300px;
    background: var(--bg-secondary);
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    border: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.portal-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: left;
}

.student-card::before {
    background: var(--accent-success);
}

.portal-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.portal-card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.admin-card:hover .card-icon { color: var(--accent-primary); }
.student-card:hover .card-icon { color: var(--accent-success); }

.portal-card h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.portal-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.5;
}

.card-btn {
    margin-top: auto;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    transition: var(--transition);
}

.student-card .card-btn {
    color: var(--accent-success);
}

.portal-card:hover .card-btn {
    gap: 1rem;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

/* Button & Form Base */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

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

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2394a3b8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem top 50%;
    background-size: 0.65rem auto;
}

/* Dashboard Layout (Admin/Student common) */
.dashboard-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-right: 1px solid var(--glass-border);
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0 1rem 2rem 1rem;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 1rem;
}

.sidebar-header i {
    font-size: 1.8rem;
    color: var(--accent-primary);
}

.sidebar-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    font-weight: 500;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-primary);
    color: white;
}

.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 2rem 3rem;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.topbar h2 {
    font-size: 1.8rem;
    font-weight: 600;
}

/* Section styling */
.content-section {
    display: none;
    animation: fadeIn 0.4s ease;
}

.content-section.active {
    display: block;
}

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

/* Cards & Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
}

.stat-info h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.stat-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Table Styles */
.table-container {
    overflow-x: auto;
    margin-top: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tbody tr {
    transition: var(--transition);
}

tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.action-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    margin-right: 0.5rem;
    transition: var(--transition);
}

.action-btn.edit:hover { color: var(--accent-primary); }
.action-btn.delete:hover { color: var(--accent-danger); }

/* Badges */
.badge {
    padding: 0.25rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}
.badge.success { background: rgba(16, 185, 129, 0.1); color: var(--accent-success); }
.badge.danger { background: rgba(239, 68, 68, 0.1); color: var(--accent-danger); }
.badge.warning { background: rgba(245, 158, 11, 0.1); color: var(--accent-warning); }

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    animation: scaleIn 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

@keyframes scaleIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* Utilities */
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-2 { margin-bottom: 2rem; }