/* ═══════════════════════════════════════════════════════════════
   ESSTSS Digital Campus v3.0 — Premium Design System
   ═══════════════════════════════════════════════════════════════ */

/* ── Variables ── */
:root {
    --primary: #0d47a1;
    --primary-light: #1976d2;
    --primary-lighter: #e3f2fd;
    --primary-gradient: linear-gradient(135deg, #0d47a1 0%, #1565c0 50%, #1976d2 100%);
    --accent: #00bcd4;
    --accent-gradient: linear-gradient(135deg, #00bcd4, #26c6da);
    --success: #00c853;
    --success-light: #e8f5e9;
    --warning: #ff9800;
    --warning-light: #fff3e0;
    --danger: #ef5350;
    --danger-light: #ffebee;
    --info: #29b6f6;
    --info-light: #e1f5fe;
    --dark: #1a1a2e;
    --dark-sidebar: #0f1729;
    --surface: #ffffff;
    --surface-hover: #f8f9ff;
    --bg: #f0f2f8;
    --text: #2d3748;
    --text-muted: #718096;
    --border: #e2e8f0;
    --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.05);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
    --shadow-primary: 0 12px 30px rgba(13, 71, 161, 0.35);
    --radius: 20px;
    --radius-sm: 14px;
    --radius-xs: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    background-image: radial-gradient(circle at 0% 0%, rgba(13, 71, 161, 0.05) 0%, transparent 40%), radial-gradient(circle at 100% 100%, rgba(0, 200, 83, 0.05) 0%, transparent 40%);
    background-attachment: fixed;
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary);
}

/* ── Sidebar ── */
#sidebar-wrapper {
    width: 270px;
    height: 100vh;
    background: var(--dark-sidebar);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1040;
    transition: var(--transition);
    overflow-y: auto;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
}

.sidebar-brand {
    padding: 28px 20px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    background: linear-gradient(180deg, rgba(25, 118, 210, 0.15) 0%, transparent 100%);
}

.sidebar-brand i {
    color: var(--accent);
    filter: drop-shadow(0 0 8px rgba(0, 188, 212, 0.4));
}

.sidebar-brand h4 {
    font-weight: 700;
    letter-spacing: 1.5px;
    font-size: 1.2rem;
    background: linear-gradient(135deg, #fff, #e0e0e0);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

#sidebar-wrapper .list-group-item {
    background: transparent;
    color: rgba(255, 255, 255, 0.65);
    border: none;
    padding: 12px 20px;
    margin: 2px 12px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
    letter-spacing: 0.3px;
}

#sidebar-wrapper .list-group-item i {
    width: 22px;
    text-align: center;
    font-size: 0.95rem;
}

#sidebar-wrapper .list-group-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    transform: translateX(4px);
}

#sidebar-wrapper .list-group-item.active {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: var(--shadow-primary);
    font-weight: 600;
}

.sidebar-section-title {
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    padding: 20px 20px 8px 32px;
    font-weight: 600;
}

/* ── Main Content ── */
#page-content-wrapper {
    margin-left: 270px;
    min-height: 100vh;
    transition: var(--transition);
}

/* ── Top Navigation ── */
.top-navbar {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(1.5);
    -webkit-backdrop-filter: blur(20px) saturate(1.5);
    border-bottom: 1px solid var(--border);
    padding: 12px 30px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.year-badge {
    background: var(--primary-lighter);
    color: var(--primary);
    border: none;
    font-weight: 600;
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.85rem;
    transition: var(--transition);
}

.year-badge:hover {
    background: var(--primary);
    color: #fff;
    box-shadow: var(--shadow-primary);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--primary-lighter);
    transition: var(--transition);
}

.user-avatar:hover {
    border-color: var(--primary);
    transform: scale(1.05);
}

.notif-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--danger);
    color: #fff;
    font-size: 0.65rem;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(239, 83, 80, 0.4);
}

/* ── Cards (Glassmorphism) ── */
.glass-card {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(24px) saturate(1.8);
    -webkit-backdrop-filter: blur(24px) saturate(1.8);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.glass-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    background: rgba(255, 255, 255, 0.85);
}

/* ── KPI Cards ── */
.kpi-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    border-radius: var(--radius) var(--radius) 0 0;
}

.kpi-card.primary::before {
    background: var(--primary-gradient);
}

.kpi-card.success::before {
    background: linear-gradient(90deg, #00c853, #69f0ae);
}

.kpi-card.warning::before {
    background: linear-gradient(90deg, #ff9800, #ffb74d);
}

.kpi-card.info::before {
    background: linear-gradient(90deg, #29b6f6, #4fc3f7);
}

.kpi-card.danger::before {
    background: linear-gradient(90deg, #ef5350, #ef9a9a);
}

.kpi-card.accent::before {
    background: var(--accent-gradient);
}

.kpi-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.kpi-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}

.kpi-icon.primary {
    background: var(--primary-lighter);
    color: var(--primary);
}

.kpi-icon.success {
    background: var(--success-light);
    color: var(--success);
}

.kpi-icon.warning {
    background: var(--warning-light);
    color: var(--warning);
}

.kpi-icon.info {
    background: var(--info-light);
    color: var(--info);
}

.kpi-icon.danger {
    background: var(--danger-light);
    color: var(--danger);
}

.kpi-icon.accent {
    background: #e0f7fa;
    color: var(--accent);
}

.kpi-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.kpi-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ── Tables ── */
.premium-table {
    border-radius: var(--radius);
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

.premium-table table {
    margin-bottom: 0;
}

.premium-table thead th {
    background: var(--bg);
    border: none;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    padding: 14px 18px;
}

.premium-table tbody td {
    padding: 14px 18px;
    border-color: var(--border);
    vertical-align: middle;
    font-size: 0.9rem;
}

.premium-table tbody tr {
    transition: var(--transition);
}

.premium-table tbody tr:hover {
    background: var(--surface-hover);
}

.premium-table tbody tr:last-child td {
    border-bottom: none;
}

/* ── Badges ── */
.badge-pill {
    padding: 5px 14px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0.3px;
}

.badge-success {
    background: var(--success-light);
    color: #2e7d32;
}

.badge-warning {
    background: var(--warning-light);
    color: #e65100;
}

.badge-danger {
    background: var(--danger-light);
    color: #c62828;
}

.badge-info {
    background: var(--info-light);
    color: #01579b;
}

.badge-primary {
    background: var(--primary-lighter);
    color: var(--primary);
}

/* ── Buttons ── */
.btn {
    border-radius: var(--radius-sm);
    font-weight: 600;
    padding: 10px 22px;
    transition: var(--transition);
    font-size: 0.9rem;
}

.btn-primary {
    background: var(--primary-gradient);
    border: none;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(13, 71, 161, 0.35);
    background: var(--primary-gradient);
}

.btn-accent {
    background: var(--accent-gradient);
    border: none;
    color: #fff;
}

.btn-outline-primary {
    border: 2px solid var(--primary);
    color: var(--primary);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary);
    color: #fff;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.82rem;
    border-radius: var(--radius-xs);
}

.btn-icon {
    width: 38px;
    height: 38px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

/* ── Forms ── */
.form-control,
.form-select {
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    font-family: var(--font);
    font-size: 0.9rem;
    transition: var(--transition);
    background: var(--surface);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px rgba(25, 118, 210, 0.1);
}

.form-label {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text);
    margin-bottom: 6px;
}

.input-group-text {
    border: 2px solid var(--border);
    border-right: none;
    background: var(--bg);
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    color: var(--text-muted);
}

.input-group .form-control {
    border-left: none;
}

/* ── Alerts (Flash messages) ── */
.alert-flash {
    border: none;
    border-radius: var(--radius-sm);
    padding: 14px 20px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideDown 0.4s ease;
}

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

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

/* ── Login Page ── */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    position: relative;
    overflow: hidden;
}

.login-wrapper::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(0, 188, 212, 0.15) 0%, transparent 70%);
    animation: float 15s infinite ease-in-out;
}

.login-wrapper::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -30%;
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    animation: float 20s infinite ease-in-out reverse;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) rotate(0deg);
    }

    33% {
        transform: translate(30px, -30px) rotate(5deg);
    }

    66% {
        transform: translate(-20px, 20px) rotate(-3deg);
    }
}

.login-card {
    width: 100%;
    max-width: 440px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(40px);
    border-radius: 24px;
    padding: 48px 40px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.login-card .logo-icon {
    width: 72px;
    height: 72px;
    background: var(--primary-gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: var(--shadow-primary);
}

.login-card .logo-icon i {
    font-size: 2rem;
    color: #fff;
}

/* ── Schedule Grid (Base) ── */
.schedule-grid {
    display: grid;
    grid-template-columns: 80px repeat(6, 1fr);
    gap: 1px;
    background: var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

/* ── Calendar Grid (Advanced) ── */
.cal-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.cal-time-col {
    width: 60px;
}

.cal-day-header {
    padding: 15px 10px;
    text-align: center;
    border-bottom: 2px solid var(--border);
    border-right: 1px solid rgba(0, 0, 0, 0.03);
    background: #fdfdfd;
}

.cal-day-name {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.cal-day-date {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text);
    margin-top: 2px;
}

.cal-today {
    background: var(--primary-lighter);
    border-bottom-color: var(--primary);
}

.cal-today .cal-day-name,
.cal-today .cal-day-date {
    color: var(--primary);
}

.cal-time-cell {
    border-right: 2px solid var(--border);
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
    text-align: right;
    padding: 10px;
    vertical-align: top;
    background: #fcfcfc;
}

.cal-time {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

.cal-cell {
    border-right: 1px solid rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
    padding: 4px;
    vertical-align: top;
    position: relative;
    transition: background 0.2s;
    background: #fff;
}

.cal-cell:hover {
    background: var(--surface-hover);
}

/* Edit/Add Overlay */
.cal-cell-add {
    position: absolute;
    inset: 0;
    background: rgba(13, 71, 161, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: 0.2s;
    color: var(--primary);
    font-size: 1.5rem;
    cursor: pointer;
    pointer-events: none;
}

.cal-cell:hover .cal-cell-add {
    opacity: 1;
    pointer-events: auto;
}

/* The Events inside the Grid */
.cal-event {
    background: var(--surface);
    border-radius: 8px;
    padding: 8px;
    margin-bottom: 4px;
    border-left: 4px solid var(--event-color, var(--primary));
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    /* We use min-height instead of fixed height so content pushes it if needed */
    z-index: 10;
}

.cal-event:hover {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px) scale(1.02);
    z-index: 20;
    /* allow it to grow over surrounding cells if content is large */
    height: auto !important;
    min-height: 100%;
}

.cal-event-actions {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(255, 255, 255, 0.9);
    padding: 4px 8px;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: none;
    z-index: 5;
}

.cal-event:hover .cal-event-actions {
    display: flex;
}

.cal-event-actions i {
    cursor: pointer;
    color: var(--text-muted);
    transition: 0.2s;
    font-size: 0.85rem;
}

.cal-event-actions i:hover {
    color: var(--primary);
    transform: scale(1.1);
}

.cal-event-actions i.fa-trash:hover {
    color: var(--danger);
}

/* Basic visual styles for grid items */
.schedule-session {
    background: var(--primary-lighter);
    color: var(--primary);
    border-radius: var(--radius-xs);
    padding: 8px;
    margin: 2px 0;
    border-left: 3px solid var(--primary);
    font-size: 0.78rem;
}

.schedule-session.td {
    background: #e8f5e9;
    color: #2e7d32;
    border-color: var(--success);
}

.schedule-session.tp {
    background: #fff3e0;
    color: #e65100;
    border-color: var(--warning);
}

/* ── Announcement Cards ── */
.announcement-card {
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 20px;
    background: var(--surface);
    margin-bottom: 12px;
    transition: var(--transition);
}

.announcement-card.urgent {
    border-color: var(--danger);
}

.announcement-card.important {
    border-color: var(--warning);
}

.announcement-card:hover {
    box-shadow: var(--shadow);
}

/* ── Action Cards ── */
.action-card {
    background: var(--primary-gradient);
    border-radius: var(--radius);
    padding: 24px;
    color: #fff;
}

.action-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #fff;
    border-radius: var(--radius-sm);
    padding: 12px 20px;
    width: 100%;
    text-align: left;
    font-weight: 500;
    transition: var(--transition);
    display: block;
    margin-bottom: 8px;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
    transform: translateX(4px);
}

/* ── Page Header ── */
.page-header {
    margin-bottom: 28px;
}

.page-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
}

.page-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ── Empty State ── */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.3;
}

.empty-state p {
    font-size: 1rem;
}

/* ── LMD Tree ── */
.lmd-tree .ue-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
}

.lmd-tree .ue-header {
    background: var(--bg);
    padding: 14px 18px;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.lmd-tree .ue-header:hover {
    background: var(--primary-lighter);
}

.lmd-tree .subject-row {
    padding: 10px 18px 10px 36px;
    border-top: 1px solid var(--border);
    font-size: 0.88rem;
    display: flex;
    justify-content: space-between;
}

.lmd-tree .subject-row:hover {
    background: var(--surface-hover);
}

/* ── Content area ── */
.content-area {
    padding: 28px 30px;
}

/* ── Responsive ── */
@media (max-width: 992px) {
    #sidebar-wrapper {
        transform: translateX(-100%);
        position: fixed;
    }

    #sidebar-wrapper.show {
        transform: translateX(0);
        box-shadow: 2px 0 20px rgba(0, 0, 0, 0.5);
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(3px);
        z-index: 1030;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .sidebar-overlay.show {
        display: block;
        opacity: 1;
    }

    #page-content-wrapper {
        margin-left: 0;
    }

    .sidebar-toggle {
        display: block !important;
    }
}

@media (max-width: 768px) {
    .content-area {
        padding: 16px;
    }

    .kpi-card {
        padding: 16px;
    }

    .kpi-value {
        font-size: 1.5rem;
    }

    .login-card {
        margin: 16px;
        padding: 32px 24px;
    }

    .page-title {
        font-size: 1.3rem;
    }
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ── Utilities ── */
.text-small {
    font-size: 0.82rem;
}

.text-xs {
    font-size: 0.75rem;
}

.fw-medium {
    font-weight: 500;
}

.gap-2 {
    gap: 0.5rem;
}

.gap-3 {
    gap: 1rem;
}

.rounded-4 {
    border-radius: var(--radius) !important;
}