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

:root {
    --bg-primary: #0f0f1a;
    --bg-sidebar: rgba(255, 255, 255, 0.03);
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-border: rgba(255, 255, 255, 0.08);
    --bg-input: rgba(255, 255, 255, 0.06);
    --bg-input-focus: rgba(255, 255, 255, 0.1);
    --bg-hover: rgba(255, 255, 255, 0.06);
    --text-primary: #f0f0f5;
    --text-secondary: #9ca3af;
    --text-placeholder: #6b7280;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.35);
    --error: #f87171;
    --success: #34d399;
    --warning: #fbbf24;
    --radius-sm: 8px;
    --radius-md: 12px;
    --transition: 0.2s ease;
}

/* ===== Light Theme ===== */
[data-theme="light"] {
    --bg-primary: #e8eaef;
    --bg-sidebar: rgba(255, 255, 255, 0.88);
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-card-border: rgba(0, 0, 0, 0.22);
    --bg-input: rgba(0, 0, 0, 0.08);
    --bg-input-focus: rgba(0, 0, 0, 0.12);
    --bg-hover: rgba(0, 0, 0, 0.08);
    --text-primary: #0f172a;
    --text-secondary: #374151;
    --text-placeholder: #6b7280;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.25);
    --error: #dc2626;
    --success: #16a34a;
    --warning: #d97706;
}

[data-theme="light"] .form-group select option,
[data-theme="light"] .filter-row select option {
    background: #fff;
    color: #1a1a2e;
}

[data-theme="light"] .nav-item.active {
    background: rgba(99, 102, 241, 0.18);
}

[data-theme="light"] .form-group input,
[data-theme="light"] .form-group select,
[data-theme="light"] .filter-row select {
    border-color: rgba(0, 0, 0, 0.15);
}

[data-theme="light"] tbody td {
    border-bottom-color: rgba(0, 0, 0, 0.08);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    transition: background 0.4s ease, color 0.4s ease;
}

/* ===== Sidebar ===== */
.sidebar {
    width: 240px;
    min-height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--bg-card-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 10;
    transition: background 0.4s ease, border-color 0.4s ease;
}

.sidebar-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--bg-card-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.sidebar-nav {
    flex: 1;
    padding: 0.75rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.65rem 0.8rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background var(--transition), color var(--transition);
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-item svg {
    transition: transform var(--transition);
}

.nav-item:hover svg {
    transform: scale(1.1);
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent-hover);
}

.sidebar-footer {
    padding: 0.75rem;
    border-top: 1px solid var(--bg-card-border);
}

.btn-logout {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.65rem 0.8rem;
    border: none;
    border-radius: var(--radius-sm);
    background: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

.btn-logout:hover {
    background: rgba(248, 113, 113, 0.1);
    color: var(--error);
}

/* ===== Main ===== */
.main {
    flex: 1;
    margin-left: 240px;
    min-height: 100vh;
}

.topbar {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--bg-card-border);
    transition: border-color 0.4s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.topbar h1 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    flex: 1;
}

.content {
    padding: 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ===== Cards ===== */
@keyframes slideUpCard {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

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

.card {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: background 0.4s ease, border-color 0.4s ease;
    animation: slideUpCard 0.4s ease-out both;
}

/* Staggered cards */
.card:nth-child(1) {
    animation-delay: 0.1s;
}

.card:nth-child(2) {
    animation-delay: 0.2s;
}

.card:nth-child(3) {
    animation-delay: 0.3s;
}

.card h2 {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ===== Create Form ===== */
.form-row {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 160px;
}

.form-group label {
    display: block;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.65rem 0.8rem;
    background: var(--bg-input);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

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

.form-group input:focus,
.form-group select:focus {
    background: var(--bg-input-focus);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.25rem;
}

.form-group select option {
    background: #1a1a2e;
    color: var(--text-primary);
}

.btn-create {
    padding: 0.65rem 1.5rem;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 2px 10px var(--accent-glow);
}

.btn-create:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px var(--accent-glow);
}

@keyframes slideDownAlert {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

.form-alert {
    display: none;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-top: 0.75rem;
}

.form-alert.error {
    display: block;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
    color: var(--error);
    animation: slideDownAlert 0.3s ease-out both;
}

.form-alert.success {
    display: block;
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.2);
    color: var(--success);
    animation: slideDownAlert 0.3s ease-out both;
}

/* ===== Table ===== */
.table-wrap {
    overflow-x: auto;
}

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

thead th {
    text-align: left;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.6rem 0.8rem;
    border-bottom: 1px solid var(--bg-card-border);
}

tbody td {
    padding: 0.7rem 0.8rem;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

@keyframes slideInRow {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }

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

tbody tr {
    transition: background var(--transition);
    animation: slideInRow 0.3s ease-out both;
}

tbody tr:nth-child(1) {
    animation-delay: 0.05s;
}

tbody tr:nth-child(2) {
    animation-delay: 0.1s;
}

tbody tr:nth-child(3) {
    animation-delay: 0.15s;
}

tbody tr:nth-child(4) {
    animation-delay: 0.2s;
}

tbody tr:nth-child(5) {
    animation-delay: 0.25s;
}

tbody tr:nth-child(n+6) {
    animation-delay: 0.3s;
}

tbody tr:hover {
    background: var(--bg-hover);
}

.loading-row {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem !important;
}

/* ===== Role Badges ===== */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-admin {
    background: rgba(248, 113, 113, 0.15);
    color: var(--error);
}

.badge-teacher {
    background: rgba(251, 191, 36, 0.15);
    color: var(--warning);
}

.badge-student {
    background: rgba(52, 211, 153, 0.15);
    color: var(--success);
}

/* ===== Education Form Badge ===== */
.badge-ef {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-hover);
}

/* ===== Card Header Row ===== */
.card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.card-header-row h2 {
    margin-bottom: 0;
}

.filter-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-row label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.filter-row select {
    padding: 0.45rem 2rem 0.45rem 0.7rem;
    background: var(--bg-input);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.6rem center;
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.filter-row select:focus {
    background-color: var(--bg-input-focus);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.filter-row select option {
    background: #1a1a2e;
    color: var(--text-primary);
}

/* ===== Tab Content ===== */
.tab-content {
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }

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

/* ===== Delete Button ===== */
.btn-delete {
    padding: 0.35rem 0.7rem;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
    border-radius: var(--radius-sm);
    color: var(--error);
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}

.btn-delete:hover {
    background: rgba(248, 113, 113, 0.2);
    transform: scale(1.05);
}

/* ===== Ripple Effect ===== */
.ripple {
    position: absolute;
    border-radius: 50%;
    transform: scale(0);
    animation: admin-ripple 0.6s linear;
    background-color: rgba(255, 255, 255, 0.3);
    pointer-events: none;
}

@keyframes admin-ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* ===== Mobile Menu Toggle ===== */
.menu-toggle {
    display: none;
    padding: 0.4rem;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.menu-toggle:hover {
    background: var(--bg-hover);
}

/* ===== Sidebar Overlay ===== */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9;
    backdrop-filter: blur(2px);
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    flex-shrink: 0;
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    transition: transform 0.4s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-toggle--fixed {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 100;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .sidebar {
        width: 240px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 20;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.open {
        display: block;
    }

    .menu-toggle {
        display: flex;
    }

    .main {
        margin-left: 0;
    }

    .topbar {
        padding: 1rem;
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }

    .topbar h1 {
        font-size: 1.1rem;
    }

    .content {
        padding: 1rem;
    }

    .card {
        padding: 1rem;
    }

    .form-row {
        flex-direction: column;
        align-items: stretch;
    }

    .form-row .form-group {
        min-width: 0;
    }

    .btn-create {
        width: 100%;
        text-align: center;
    }

    tbody td {
        padding: 0.5rem 0.6rem;
        font-size: 0.82rem;
    }

    thead th {
        padding: 0.5rem 0.6rem;
        font-size: 0.72rem;
    }

    .table-wrap {
        margin: 0 -1rem;
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .topbar h1 {
        font-size: 0.95rem;
    }

    .badge {
        font-size: 0.65rem;
        padding: 0.15rem 0.45rem;
    }

    .btn-delete {
        padding: 0.25rem 0.5rem;
        font-size: 0.72rem;
    }
}