/* ===== Unicode Icons (kept for backward compat) ===== */
.icon { display: inline-block; width: 1em; height: 1em; margin-right: 0.375rem; vertical-align: middle; font-style: normal; }
.icon-dashboard::before { content: ""; }
.icon-classes::before { content: ""; }
.icon-students::before { content: ""; }
.icon-teachers::before { content: ""; }
.icon-subjects::before { content: ""; }
.icon-schedule::before { content: ""; }
.icon-grades::before { content: ""; }
.icon-attendance::before { content: ""; }
.icon-homework::before { content: ""; }
.icon-statistics::before { content: ""; }
.icon-settings::before { content: ""; }
.icon-user::before { content: ""; }
.icon-logout::before { content: ""; }
.icon-add::before { content: "+"; }
.icon-edit::before { content: ""; }
.icon-delete::before { content: ""; }
.icon-export::before { content: ""; }
.icon-search::before { content: ""; }
.icon-filter::before { content: ""; }

/* ===== Page Header ===== */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}
.page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}
.page-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
    box-shadow: var(--shadow-md);
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}
.card-header h2, .card-header h3 { margin: 0; }

/* Stat Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.stat-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem 1.5rem 1.25rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.stat-card-accent { border-top: 3px solid var(--color-primary); }
.stat-card .stat-icon {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
    display: inline-block;
    align-self: flex-start;
    line-height: 1;
}
.stat-card h3 {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.25rem;
    letter-spacing: 0;
    text-transform: none;
}
.stat-card .stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.1;
    margin-top: 0.25rem;
}
.stat-card .stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 0.25rem;
}
.stat-link {
    display: inline-block;
    font-size: 0.8rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-top: 0.5rem;
    text-decoration: none;
}
.stat-link:hover { text-decoration: underline; }

/* Color variants for stat cards */
.stat-blue   { border-top: 3px solid #3b82f6; }
.stat-green  { border-top: 3px solid #10b981; }
.stat-orange { border-top: 3px solid #f59e0b; }
.stat-purple { border-top: 3px solid #8b5cf6; }
.stat-red    { border-top: 3px solid #ef4444; }

/* ===== Tables ===== */
.table-container {
    overflow-x: auto;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--bg-primary);
}
.data-table thead {
    background: var(--bg-tertiary);
}
.data-table th {
    padding: 0.85rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}
.data-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}
.data-table tbody tr { transition: background 0.15s; }
.data-table tbody tr:hover { background: var(--bg-tertiary, #f3f4f6); }
.data-table tbody tr:last-child td { border-bottom: none; }

/* ===== Forms ===== */
.form-group { margin-bottom: 1rem; }
.form-group label {
    display: block;
    margin-bottom: 0.375rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.8rem;
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="date"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.15s, box-shadow 0.15s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 0.5rem;
}
.form-actions { display: flex; gap: 0.75rem; margin-top: 1rem; }

/* ===== Modals ===== */
.modal {
    display: none;
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    backdrop-filter: blur(4px);
    align-items: center; justify-content: center;
}
.modal.active { display: flex; }
.modal-content {
    background: var(--bg-primary);
    border-radius: 0.75rem;
    padding: 1.5rem;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    animation: modalIn 0.25s ease-out;
}
@keyframes modalIn {
    from { opacity: 0; transform: scale(0.96) translateY(-8px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 1.25rem; padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}
.modal-header h3 { margin: 0; font-size: 1.25rem; }
.modal-close {
    background: none; border: none;
    font-size: 1.5rem; cursor: pointer;
    color: var(--text-secondary);
    line-height: 1; padding: 0.25rem;
}
.modal-close:hover { color: var(--text-primary); }
.modal-body { margin-bottom: 1.25rem; }
.modal-footer {
    display: flex; justify-content: flex-end; gap: 0.75rem;
    padding-top: 0.75rem; border-top: 1px solid var(--border-color);
}

/* ===== Badges ===== */
.badge {
    display: inline-flex; align-items: center;
    padding: 0.2rem 0.6rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-danger  { background: #fee2e2; color: #7f1d1d; }
.badge-warning { background: #fef3c7; color: #78350f; }
.badge-info    { background: #dbeafe; color: #1e3a8a; }
.badge-primary { background: var(--color-primary-light, #dbeafe); color: var(--color-primary); }

[data-theme="dark"] .badge-success { background: #064e3b; color: #6ee7b7; }
[data-theme="dark"] .badge-danger  { background: #450a0a; color: #fca5a5; }
[data-theme="dark"] .badge-warning { background: #451a03; color: #fcd34d; }
[data-theme="dark"] .badge-info    { background: #1e3a8a; color: #93c5fd; }

/* Grade Badges */
.grade-badge {
    display: inline-flex; align-items: center; justify-content: center;
    width: 2rem; height: 2rem;
    border-radius: 0.5rem;
    font-weight: 700;
    font-size: 0.9rem;
}
.grade-5 { background: #d1fae5; color: #065f46; }
.grade-4 { background: #dbeafe; color: #1e3a8a; }
.grade-3 { background: #fef3c7; color: #78350f; }
.grade-2 { background: #fee2e2; color: #7f1d1d; }

[data-theme="dark"] .grade-5 { background: #064e3b; color: #6ee7b7; }
[data-theme="dark"] .grade-4 { background: #1e3a8a; color: #93c5fd; }
[data-theme="dark"] .grade-3 { background: #451a03; color: #fcd34d; }
[data-theme="dark"] .grade-2 { background: #450a0a; color: #fca5a5; }

/* ===== Empty State ===== */
.empty-state {
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-secondary);
    background: var(--bg-tertiary, #f3f4f6);
    border-radius: 0.75rem;
    border: 2px dashed var(--border-color);
    font-size: 0.9rem;
}

/* ===== Classes Grid ===== */
.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
}
.class-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}
.class-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-primary, linear-gradient(135deg, #3b82f6, #2563eb));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s;
}
.class-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
    color: inherit;
}
.class-card:hover::before { transform: scaleX(1); }
.class-card h3 { font-size: 1.25rem; color: var(--color-primary); margin-bottom: 0.375rem; }
.class-grade, .class-teacher, .class-students, .class-year {
    font-size: 0.8rem; color: var(--text-secondary); margin: 0.125rem 0;
}
.class-actions {
    margin-top: 0.75rem; padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    display: flex; gap: 0.375rem; flex-wrap: wrap;
}

/* ===== Homework List ===== */
.homework-list { display: flex; flex-direction: column; gap: 0.75rem; }
.homework-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
    border-left: 4px solid var(--color-primary);
}
.homework-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; flex-wrap: wrap; gap: 0.5rem; }
.homework-item h4 { font-size: 1rem; color: var(--text-primary); margin: 0; }
.homework-badge { background: var(--color-primary); color: white; padding: 0.2rem 0.6rem; border-radius: 1rem; font-size: 0.75rem; font-weight: 500; }
.homework-subject { color: var(--color-primary); font-weight: 500; font-size: 0.85rem; margin-bottom: 0.375rem; }
.homework-description { color: var(--text-primary); margin-bottom: 0.5rem; font-size: 0.875rem; line-height: 1.5; }
.homework-footer {
    display: flex; flex-wrap: wrap; gap: 1rem;
    padding-top: 0.5rem; border-top: 1px solid var(--border-color);
    font-size: 0.8rem; color: var(--text-secondary);
}

/* ===== Tabs ===== */
.content-tabs {
    display: flex; gap: 0;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}
.tab-link {
    padding: 0.625rem 1.25rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.15s;
}
.tab-link:hover { color: var(--color-primary); text-decoration: none; }
.tab-link.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== Quick Actions Grid ===== */
.quick-actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.75rem;
}
.quick-action-card {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 0.5rem;
    padding: 1.25rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.8rem;
    transition: all 0.2s;
    text-align: center;
}
.quick-action-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}
.quick-action-card .qa-icon { font-size: 1.75rem; }

/* ===== Section ===== */
.content-section {
    margin-bottom: 1.5rem;
}
.content-section:last-child { margin-bottom: 0; }
.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* ===== Action Buttons ===== */
.action-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.action-buttons-inline { display: flex; gap: 0.375rem; flex-wrap: wrap; }

/* ===== Grade/Attendance Forms ===== */
.grade-form, .attendance-form, .homework-form, .filter-form {
    background: var(--bg-secondary);
    padding: 1.25rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .page-header { flex-direction: column; }
    .page-header .btn { width: 100%; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .classes-grid { grid-template-columns: 1fr; }
    .quick-actions-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
}