:root {
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --danger: #ef4444;
    --danger-hover: #f87171;
    --success: #22c55e;
    --warning: #f97316;
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --border: #334155;
    --input-bg: #1e293b;
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

/* Navbar */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand { font-weight: 700; font-size: 1.1rem; color: var(--primary); }

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

.nav-user { color: var(--text-muted); font-size: 0.9rem; }

/* Container */
.container { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }

/* Flash messages */
.flash-messages { max-width: 1100px; margin: 0 auto; padding: 1rem 1.5rem 0; }

.flash {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.flash-success { background: #052e16; color: #4ade80; border: 1px solid #166534; }
.flash-error { background: #450a0a; color: #fca5a5; border: 1px solid #7f1d1d; }

/* Auth pages */
.auth-container { display: flex; justify-content: center; align-items: center; min-height: 80vh; }

.auth-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,0.4);
    width: 100%;
    max-width: 400px;
}

.auth-card h1 { margin-bottom: 1.5rem; font-size: 1.5rem; }

.auth-link { margin-top: 1rem; font-size: 0.9rem; color: var(--text-muted); }
.auth-link a { color: var(--primary); text-decoration: none; }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.25rem; font-weight: 500; font-size: 0.9rem; }

input[type="text"],
input[type="password"],
input[type="date"],
input[type="number"],
select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background: var(--input-bg);
    color: var(--text);
}

input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.2); }

.form-inline { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: flex-end; }
.form-inline .form-group { flex: 1; min-width: 150px; }

.radio-group { display: flex; gap: 1.5rem; margin-top: 0.25rem; }
.radio-group label { font-weight: normal; cursor: pointer; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    color: white;
}

.btn-primary { background: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: var(--danger-hover); }
.btn-small { padding: 0.3rem 0.6rem; font-size: 0.8rem; background: var(--card-bg); border: 1px solid var(--border); color: var(--text); }
.btn-small:hover { background: var(--border); }
.btn-logout {
    background: transparent;
    color: var(--danger);
    border: 2px solid var(--danger);
    font-weight: 600;
    padding: 0.4rem 1rem;
}
.btn-logout:hover { background: var(--danger); color: white; }

/* Dashboard header */
.dashboard-header { margin-bottom: 1.5rem; }
.today-date { color: var(--text-muted); font-size: 0.9rem; }

/* Sections */
.section {
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    margin-bottom: 1.5rem;
}

.section h2 { font-size: 1.2rem; margin-bottom: 1rem; }
.section h2 small { font-weight: normal; color: var(--text-muted); font-size: 0.85rem; }
.section h3 { font-size: 1rem; margin-bottom: 0.75rem; color: var(--text-muted); }

.semester-actions { margin-top: 0.75rem; }
.semester-actions-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem; }
.semester-actions-row label { font-weight: 500; font-size: 0.9rem; white-space: nowrap; }
.semester-actions-row input { width: 140px; padding: 0.35rem 0.5rem; font-size: 0.9rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--input-bg); color: var(--text); }

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

.stat-card {
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    text-align: center;
}

.stat-value { font-size: 2rem; font-weight: 700; }
.stat-value small { font-size: 1rem; color: var(--text-muted); font-weight: normal; }
.stat-label { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.25rem; }
.stat-warning { color: var(--danger); font-size: 0.8rem; margin-top: 0.5rem; font-weight: 600; }
.stat-note { color: var(--text-muted); font-size: 0.8rem; margin-top: 0.5rem; }

.stat-success .stat-value { color: var(--success); }
.stat-danger .stat-value { color: var(--danger); }
.pulse-danger { animation: pulse-zoom 1.2s ease-in-out infinite; }
@keyframes pulse-zoom {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.progress-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    margin-top: 0.75rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s;
}

.stat-danger .progress-fill { background: var(--danger); }

/* Two column layout */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

@media (max-width: 768px) {
    .two-col { grid-template-columns: 1fr; }
    .form-inline { flex-direction: column; }
}

/* Leave table */
.leave-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }

.leave-table th, .leave-table td {
    padding: 0.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.leave-type-personal { color: var(--danger); font-weight: 500; }
.leave-type-rainy { color: #a78bfa; font-weight: 500; }

.empty-state { color: var(--text-muted); font-size: 0.9rem; font-style: italic; }

/* Calendar legend */
.calendar-legend { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 0.75rem; font-size: 0.8rem; }

.legend-item { display: flex; align-items: center; gap: 0.3rem; }

.legend-color {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

.legend-weekend { background: #64748b; }
.legend-national { background: #3b82f6; }
.legend-tn { background: #f97316; }
.legend-personal { background: #ef4444; }
.legend-rainy { background: #8b5cf6; }

/* Flatpickr custom styles */
.flatpickr-day.day-weekend { background: #334155 !important; color: #64748b !important; }
.flatpickr-day.day-national { background: #2563eb !important; border-color: #60a5fa !important; color: #fff !important; }
.flatpickr-day.day-tn { background: #ea580c !important; border-color: #fb923c !important; color: #fff !important; }
.flatpickr-day.day-personal { background: #dc2626 !important; border-color: #f87171 !important; color: #fff !important; }
.flatpickr-day.day-rainy { background: #7c3aed !important; border-color: #a78bfa !important; color: #fff !important; }

/* Flatpickr dark theme overrides */
.flatpickr-calendar {
    background: var(--card-bg) !important;
    border: 1px solid var(--border) !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4) !important;
    padding: 0.75rem !important;
    width: fit-content !important;
    margin-inline: auto !important;
}
.flatpickr-calendar.open { border: 1px solid var(--border) !important; }
.flatpickr-months .flatpickr-month { background: var(--card-bg) !important; color: var(--text) !important; fill: var(--text) !important; }
.flatpickr-months .flatpickr-month svg { fill: var(--text) !important; }
.flatpickr-current-month .flatpickr-monthDropdown-months { background: var(--card-bg) !important; color: var(--text) !important; }
.flatpickr-current-month input.cur-year { color: var(--text) !important; background: var(--card-bg) !important; }
.flatpickr-monthDropdown-container { background: var(--card-bg) !important; }
.flatpickr-monthDropdown-container:hover { background: #334155 !important; }
span.flatpickr-weekday { background: var(--card-bg) !important; color: var(--text-muted) !important; }
.flatpickr-weekdaycontainer { background: var(--card-bg) !important; }
.flatpickr-weekdays { background: var(--card-bg) !important; }
.flatpickr-weekday { background: var(--card-bg) !important; color: var(--text-muted) !important; }
.flatpickr-days { background: var(--card-bg) !important; }
.dayContainer { border: none !important; outline: none !important; }
.flatpickr-day {
    background: #0f172a !important;
    color: #e2e8f0 !important;
    border: none !important;
}
.flatpickr-day:hover { background: #334155 !important; border-color: var(--primary) !important; }
.flatpickr-day.selected { background: var(--primary) !important; color: white !important; border-color: var(--primary) !important; }
.flatpickr-day.inRange { background: #1e3a5f !important; }
.flatpickr-day.prevMonthDay, .flatpickr-day.nextMonthDay { color: #475569 !important; }
.flatpickr-day.flatpickr-disabled { color: #334155 !important; }
.flatpickr-months .flatpickr-prev-month, .flatpickr-months .flatpickr-next-month { color: var(--text) !important; fill: var(--text) !important; }
.flatpickr-months .flatpickr-prev-month svg, .flatpickr-months .flatpickr-next-month svg { fill: var(--text) !important; }

/* Flatpickr input dark style */
.semester-actions-row input.flatpickr-input,
.form-group input.flatpickr-input {
    background: var(--input-bg);
    color: var(--text);
    border: 1px solid var(--border);
}
input.flatpickr-input:focus { border-color: var(--primary); }

/* Working day indicator */
.working-day-indicator { font-size: 0.9rem; line-height: 2.2; }

/* Admin nav button */
.btn-admin-nav {
    background: #7c3aed;
    color: white;
    border: none;
    padding: 0.4rem 1rem;
    font-weight: 600;
}
.btn-admin-nav:hover { background: #6d28d9; }

/* Admin panel */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}
.admin-header h1 { font-size: 1.5rem; }
.admin-nav { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.admin-table th, .admin-table td {
    padding: 0.6rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.admin-table th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.admin-table tr:hover { background: rgba(255,255,255,0.03); }

.user-link { color: var(--primary); text-decoration: none; font-weight: 500; }
.user-link:hover { text-decoration: underline; }

.text-muted { color: var(--text-muted); }
.text-danger { color: var(--danger); font-weight: 600; }
.text-success { color: var(--success); font-weight: 600; }

/* Badges */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}
.badge-admin { background: #7c3aed; color: #fff; }
.badge-user { background: var(--border); color: var(--text-muted); }
.badge-national { background: #2563eb; color: #fff; }
.badge-tn { background: #ea580c; color: #fff; }
.badge-official { background: #7c3aed; color: #fff; }

/* User detail page */
.user-info-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1rem;
}
.user-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }

.admin-semester-form { margin-top: 0.75rem; }
.admin-semester-form .btn { margin-bottom: 1rem; }

@media (max-width: 768px) {
    .admin-header { flex-direction: column; align-items: flex-start; }
    .admin-table { font-size: 0.8rem; }
    .admin-table th, .admin-table td { padding: 0.4rem 0.5rem; }
}

/* Section header with inline controls */
.section-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.section-header-row h2 { margin-bottom: 0; }

.year-filter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.year-filter label { font-size: 0.9rem; font-weight: 500; white-space: nowrap; }
.year-filter select { width: auto; min-width: 90px; }