/* Premium Design System & CSS Variables */
:root {
    --bg-base: #080B11;
    --bg-surface: rgba(17, 24, 39, 0.7);
    --bg-surface-opaque: #0f1524;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-glow: rgba(99, 102, 241, 0.4);
    
    --color-primary: #6366F1;
    --color-primary-glow: rgba(99, 102, 241, 0.15);
    --color-secondary: #06B6D4;
    --color-accent: #a855f7;
    
    --text-main: #F3F4F6;
    --text-muted: #9CA3AF;
    --text-inverse: #0B0F19;
    
    --success: #10B981;
    --success-glow: rgba(16, 185, 129, 0.15);
    --warning: #F59E0B;
    --warning-glow: rgba(245, 158, 11, 0.15);
    --danger: #EF4444;
    --danger-glow: rgba(239, 68, 68, 0.15);

    --font-sans: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-lg: 16px;
    --border-radius-md: 10px;
    
    --glow-shadow: 0 0 20px rgba(99, 102, 241, 0.25);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Light Mode Tokens override */
body.light-mode {
    --bg-base: #f4f6fa;
    --bg-surface: rgba(255, 255, 255, 0.75);
    --bg-surface-opaque: #ffffff;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-color-glow: rgba(99, 102, 241, 0.3);
    
    --color-primary: #4f46e5;
    --color-primary-glow: rgba(79, 70, 229, 0.1);
    --color-secondary: #0891b2;
    
    --text-main: #1f2937;
    --text-muted: #6b7280;
    
    --glow-shadow: 0 0 15px rgba(79, 70, 229, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
}

/* General Resets & Layout */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* Interactive Utility classes */
.hidden {
    display: none !important;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.glass-panel {
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--glass-shadow);
    transition: var(--transition-smooth);
}

.glass-panel:hover {
    border-color: var(--border-color-glow);
    box-shadow: var(--glow-shadow), var(--glass-shadow);
}

/* Background Glowing Accents */
.glow-backdrop {
    position: absolute;
    width: 40vw;
    height: 40vw;
    border-radius: 50%;
    background: radial-gradient(circle, var(--color-primary-glow) 0%, rgba(0,0,0,0) 70%);
    z-index: -1;
    pointer-events: none;
    filter: blur(60px);
}
.glow-top-right {
    top: -10vw;
    right: -10vw;
}
.glow-bottom-left {
    bottom: -15vw;
    left: -15vw;
}

/* Login Screen Layout */
#login-container {
    width: 100vw;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
    padding: 20px;
}

.login-card {
    width: 100%;
    max-width: 420px;
    padding: 40px 30px;
    z-index: 10;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-logo-img {
    width: 100%;
    max-width: 300px;
    height: auto;
    margin-bottom: 20px;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-logo-img {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: var(--border-radius-md);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.login-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Form Styles */
.form-group {
    position: relative;
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 1rem;
    outline: none;
    transition: var(--transition-smooth);
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
    background: rgba(0, 0, 0, 0.4);
}

.login-error-msg {
    color: var(--danger);
    font-size: 0.85rem;
    margin-bottom: 15px;
    min-height: 18px;
}

.action-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    border: none;
    border-radius: var(--border-radius-md);
    color: #ffffff;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
    opacity: 0.95;
}

.action-btn:active {
    transform: translateY(0);
}

.preset-login {
    margin-top: 25px;
    text-align: center;
    border-top: 1px dashed var(--border-color);
    padding-top: 20px;
}

.preset-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.preset-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.preset-user-btn {
    padding: 8px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-main);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.preset-user-btn:hover {
    background: var(--color-primary-glow);
    border-color: var(--color-primary);
}

/* App Shell (Dashboard Layout) */
#app-container, #admin-app-container {
    display: flex;
    width: 100vw;
    min-height: 100vh;
}

/* Sidebar Navigation */
.app-sidebar {
    width: 260px;
    background: var(--bg-surface-opaque);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 100;
    transition: var(--transition-smooth);
}

.sidebar-header {
    padding: 30px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo-text {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.sidebar-logo-text span {
    color: var(--color-primary);
}

/* Student Profile Widget */
.sidebar-profile {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.student-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: #ffffff;
    font-weight: 700;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.3);
}

.profile-info {
    overflow: hidden;
}

.profile-name {
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
}

.profile-grade {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Nav Menu */
.sidebar-menu {
    flex-grow: 1;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.sidebar-nav-link i {
    width: 20px;
    font-size: 1.1rem;
    text-align: center;
}

.sidebar-nav-link:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.03);
}

.sidebar-nav-link.active {
    color: #ffffff;
    background: var(--color-primary);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.sidebar-footer {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
}

.theme-toggle-btn-global {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 1000;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-surface);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--glass-shadow);
    transition: var(--transition-smooth);
}

.theme-toggle-btn-global:hover {
    border-color: var(--color-primary);
    box-shadow: var(--glow-shadow), var(--glass-shadow);
    transform: scale(1.05);
}

/* Main Content Workspace */
.app-content {
    flex-grow: 1;
    padding: 40px;
    overflow-y: auto;
    position: relative;
}

.app-view {
    max-width: 1100px;
    margin: 0 auto;
}

.view-header {
    margin-bottom: 30px;
}

.view-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 6px;
}

.view-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Cards & Grid Systems */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.metric-card {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.metric-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-primary);
    font-size: 1.4rem;
}

.metric-details p {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.metric-value {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* Dashboard Home Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
}

.profile-summary-card {
    padding: 30px;
    margin-bottom: 20px;
}

.profile-grid-detail {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.profile-field span {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.profile-field strong {
    font-size: 0.95rem;
}

/* Circular Attendance Widget */
.metric-card-circular {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-circle-svg {
    transform: rotate(-90deg);
}

.progress-circle-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.05);
    stroke-width: 6px;
}

.progress-circle-val {
    fill: none;
    stroke: var(--color-secondary);
    stroke-width: 6px;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s ease-in-out;
}

/* Announcements block */
.announcements-card {
    padding: 30px;
}

.announcements-card h3 {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.announcement-item {
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}

.announcement-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.announcement-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
}

.announcement-badge {
    padding: 2px 8px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary);
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 600;
    border-radius: 12px;
}

.announcement-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.announcement-item h4 {
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.announcement-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Performance Page Layout */
.perf-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 20px;
}

.subject-card {
    padding: 20px;
    margin-bottom: 16px;
}

.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.subject-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.subject-grade {
    font-weight: 700;
    font-size: 1.1rem;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 1.2s cubic-bezier(0.1, 0.8, 0.25, 1);
}

.subject-footer {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.subject-score {
    font-weight: 600;
    color: var(--text-main);
}

/* Performance Trend SVG Chart */
.chart-container {
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.chart-svg-wrapper {
    position: relative;
    width: 100%;
    height: 250px;
    margin-top: 20px;
}

.chart-grid-line {
    stroke: rgba(255, 255, 255, 0.04);
    stroke-width: 1px;
}

.chart-axis-label {
    fill: var(--text-muted);
    font-size: 0.7rem;
    font-family: var(--font-sans);
}

.chart-line-path {
    fill: none;
    stroke: var(--color-primary);
    stroke-width: 3.5px;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.chart-area-path {
    fill: url(#areaGradient);
    opacity: 0.15;
}

.chart-dot {
    fill: var(--bg-base);
    stroke: var(--color-primary);
    stroke-width: 3px;
    cursor: pointer;
    transition: r 0.2s ease;
}

.chart-dot:hover {
    r: 8px;
}

/* Attendance Page Calendar styles */
.calendar-card {
    padding: 30px;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.calendar-nav-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: var(--border-radius-md);
    color: var(--text-main);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.calendar-nav-btn:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-glow);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.calendar-weekday {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    padding-bottom: 12px;
}

.calendar-day {
    aspect-ratio: 1.2;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition-smooth);
}

.calendar-day.empty {
    background: transparent;
    border-color: transparent;
    pointer-events: none;
}

.date-number {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
}

.day-badge {
    font-size: 0.65rem;
    font-weight: 800;
    padding: 1px 5px;
    border-radius: 4px;
    align-self: flex-end;
}

/* Calendar status styling */
.calendar-day.present {
    background: rgba(16, 185, 129, 0.05);
    border-color: rgba(16, 185, 129, 0.2);
}
.calendar-day.present .date-number {
    color: var(--success);
}
.present-badge {
    background: var(--success);
    color: #ffffff;
}

.calendar-day.absent {
    background: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.2);
}
.calendar-day.absent .date-number {
    color: var(--danger);
}
.absent-badge {
    background: var(--danger);
    color: #ffffff;
}

.calendar-day.late {
    background: rgba(245, 158, 11, 0.05);
    border-color: rgba(245, 158, 11, 0.2);
}
.calendar-day.late .date-number {
    color: var(--warning);
}
.late-badge {
    background: var(--warning);
    color: #ffffff;
}

.calendar-day.weekend {
    background: rgba(255, 255, 255, 0.01);
    opacity: 0.6;
}
.weekend-badge {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
}

.calendar-legend {
    display: flex;
    gap: 20px;
    margin-top: 24px;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.legend-dot.present { background: var(--success); }
.legend-dot.absent { background: var(--danger); }
.legend-dot.late { background: var(--warning); }
.legend-dot.weekend { background: rgba(255, 255, 255, 0.3); }

/* Fee structure Billing & Invoices styles */
.fees-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 20px;
}

.invoice-table-container {
    padding: 30px;
}

.fees-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    text-align: left;
}

.fees-table th, .fees-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}

.fees-table th {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-weight: 600;
}

.fees-table td {
    font-size: 0.9rem;
}

.status-badge {
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}
.status-badge.paid {
    background: var(--success-glow);
    color: var(--success);
}
.status-badge.unpaid {
    background: var(--danger-glow);
    color: var(--danger);
}
.status-badge.partial {
    background: var(--warning-glow);
    color: var(--warning);
}

/* Payment Plan Section */
.payment-plan-card {
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.payment-plan-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.payment-plan-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.scheme-tabs {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 30px;
    padding: 4px;
    border: 1px solid var(--border-color);
}

.scheme-tab-btn {
    border: none;
    background: none;
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: 20px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.scheme-tab-btn:hover {
    color: var(--text-main);
}

.scheme-tab-btn.active {
    background: var(--color-primary);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

.scheme-content-pane {
    animation: fadeIn 0.3s ease-in-out;
}

.scheme-desc-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* Pay In Full Box */
.full-pay-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    text-align: center;
    margin-top: 15px;
}

.amount-due-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
}

.amount-due-row span {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.amount-due-row strong {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-secondary);
    letter-spacing: -1px;
}

/* Installments Timeline Stepper */
.installments-timeline {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
    padding-left: 20px;
    margin-top: 10px;
}

.timeline-step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    position: relative;
    padding-bottom: 25px;
}

.timeline-step::before {
    content: '';
    position: absolute;
    left: -13px;
    top: 26px;
    width: 2px;
    height: calc(100% - 20px);
    background: var(--border-color);
    z-index: 1;
}

.timeline-step:last-child::before {
    display: none;
}

.timeline-step.active::before {
    background: linear-gradient(180deg, var(--color-primary), var(--border-color));
}

.timeline-step.paid::before {
    background: var(--success);
}

.timeline-marker {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-surface-opaque);
    border: 2px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    position: absolute;
    left: -26px;
    z-index: 2;
    transition: var(--transition-smooth);
}

.timeline-step.paid .timeline-marker {
    background: var(--success-glow);
    border-color: var(--success);
    color: var(--success);
}

.timeline-step.active .timeline-marker {
    background: var(--color-primary-glow);
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

.timeline-info {
    flex-grow: 1;
    padding-top: 3px;
}

.timeline-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.timeline-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.timeline-action {
    align-self: center;
}

.timeline-step-badge {
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.timeline-step-badge.paid {
    background: var(--success-glow);
    color: var(--success);
}

.timeline-step-badge.locked {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

/* Modal Popup Payment Form */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-card {
    width: 100%;
    max-width: 480px;
    padding: 30px;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-card {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.3rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.modal-close-btn:hover {
    color: var(--text-main);
}

/* Simulated Transaction Receipts Overlay */
.receipt-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    z-index: 2000;
    padding: 20px;
}

.receipt-card {
    width: 100%;
    max-width: 440px;
    padding: 40px 30px;
    text-align: center;
}

.receipt-details {
    margin: 25px 0;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--border-radius-md);
    padding: 20px;
    border: 1px solid var(--border-color);
}

.receipt-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.receipt-row:last-child {
    border-bottom: none;
}

.receipt-row span {
    color: var(--text-muted);
}

.receipt-footer {
    margin-top: 10px;
}

/* Keyframes & Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-8px); }
    40%, 80% { transform: translateX(8px); }
}

.shake-animation {
    animation: shake 0.4s ease-in-out;
}

@keyframes pulseSubtle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.animate-pulse-subtle {
    animation: pulseSubtle 2s infinite ease-in-out;
}

.danger-text { color: var(--danger); }
.success-text { color: var(--success); }

/* Responsive adjustments */
@media (max-width: 900px) {
    #app-container {
        flex-direction: column;
    }
    
    .app-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .sidebar-header {
        padding: 15px 20px;
        justify-content: space-between;
    }

    .sidebar-profile {
        display: none; /* Hide profile in side panel on mobile */
    }

    .sidebar-menu {
        flex-direction: row;
        overflow-x: auto;
        padding: 10px 20px;
        gap: 15px;
    }

    .sidebar-nav-link {
        padding: 8px 12px;
        white-space: nowrap;
    }

    .sidebar-footer {
        display: none;
    }

    .app-content {
        padding: 20px;
    }

    .dashboard-grid, .perf-grid, .fees-grid {
        grid-template-columns: 1fr;
    }

    .calendar-grid {
        gap: 4px;
    }

    .calendar-day {
        padding: 6px;
    }

    .date-number {
        font-size: 0.75rem;
    }

    .day-badge {
        font-size: 0.55rem;
        padding: 0px 3px;
    }
}

/* ========================================================
   ADMINISTRATOR DASHBOARD & CONTROL PANEL STYLES
   ======================================================== */

.admin-body {
    background-color: var(--bg-base);
    color: var(--text-main);
    overflow-x: hidden;
}

.admin-sidebar {
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.admin-search-box {
    padding: 10px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-bottom: 1px solid var(--border-color);
}

.search-input-wrapper {
    position: relative;
    width: 100%;
}

.search-input-wrapper input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 10px 12px 10px 35px;
    color: var(--text-bright);
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition-smooth);
}

.search-input-wrapper input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 8px var(--color-primary-glow);
}

.search-input-wrapper .search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.icon-btn-action {
    background: var(--color-primary);
    color: #ffffff;
    border: none;
    border-radius: var(--border-radius-md);
    padding: 10px 15px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 12px var(--color-primary-glow);
}

.icon-btn-action:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.5);
}

.icon-btn-action.secondary-action {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    box-shadow: none;
}

.icon-btn-action.secondary-action:hover {
    background: rgba(255, 255, 255, 0.08);
    box-shadow: none;
}

.sidebar-section-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: bold;
    padding: 15px 20px 5px 20px;
}

.admin-student-list {
    flex-grow: 1;
    overflow-y: auto;
    padding: 5px 15px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.student-list-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.student-list-item:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--border-color);
}

.student-list-item.active {
    background: rgba(99, 102, 241, 0.08);
    border-color: rgba(99, 102, 241, 0.25);
}

.student-avatar-sm {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-primary-glow);
    color: var(--color-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 0.8rem;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.student-item-details {
    flex-grow: 1;
    overflow: hidden;
}

.student-item-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-bright);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.student-item-meta {
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.student-item-badge {
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.65rem;
    font-weight: bold;
}

.student-item-badge.fees-pending {
    background: var(--danger-glow);
    color: var(--danger);
}

.student-item-badge.fees-paid {
    background: var(--success-glow);
    color: var(--success);
}

/* Admin workspace views */
.admin-workspace {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.workspace-empty-state {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 60px;
    margin: auto;
    max-width: 550px;
}

.workspace-empty-state .state-icon {
    font-size: 4rem;
    color: var(--text-muted);
    opacity: 0.25;
    margin-bottom: 25px;
}

.workspace-empty-state h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-bright);
    margin-bottom: 15px;
}

.workspace-empty-state p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.workspace-editor {
    display: flex;
    flex-direction: column;
    height: 100%;
    animation: fadeIn 0.4s ease forwards;
}

.workspace-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 20px;
}

.header-student-profile {
    display: flex;
    align-items: center;
    gap: 15px;
}

.student-avatar-lg {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-secondary-glow);
    color: var(--color-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.3rem;
    font-weight: 800;
    border: 2px solid rgba(6, 182, 212, 0.2);
}

.workspace-header h1 {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-bright);
    letter-spacing: -0.5px;
}

.workspace-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.editor-actions {
    display: flex;
    gap: 12px;
}

.success-btn-action {
    background: var(--success);
    color: #ffffff;
    box-shadow: 0 4px 12px var(--success-glow);
}

.success-btn-action:hover {
    background: #0ea271;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.5);
}

.danger-btn-action {
    background: var(--danger);
    color: #ffffff;
    box-shadow: 0 4px 12px var(--danger-glow);
}

.danger-btn-action:hover {
    background: #e13251;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(244, 63, 94, 0.5);
}

/* Tabs list styles */
.admin-editor-tabs {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1px;
    overflow-x: auto;
}

.editor-tab-btn {
    border: none;
    background: none;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 12px 20px;
    cursor: pointer;
    position: relative;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.editor-tab-btn:hover {
    color: var(--text-bright);
}

.editor-tab-btn.active {
    color: var(--color-primary);
}

.editor-tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    box-shadow: 0 0 8px var(--color-primary);
}

.editor-tab-body {
    flex-grow: 1;
    padding-bottom: 50px;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-panel.active {
    display: block;
}

/* Grid layout forms */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 10px;
}

.section-subtitle {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-bright);
    margin: 25px 0 15px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    border-left: 3px solid var(--color-primary);
    padding-left: 10px;
}

/* Subject list editor */
.subjects-editor-list, .installments-editor-list, .breakdown-editor-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 10px;
}

.subject-editor-row, .installment-editor-row {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border-color);
    padding: 10px 15px;
    border-radius: var(--border-radius-md);
    flex-wrap: wrap;
}

/* Attendance editor widgets */
.attendance-editor-dashboard {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 30px;
    align-items: start;
}

.attendance-calc-card {
    padding: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 20px;
}

.attendance-stat-input {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.attendance-stat-input .stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -1px;
}

.attendance-stat-input .stat-lbl {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.attendance-counters {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
}

.counter-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.counter-item label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.compact-input {
    width: 80px;
    text-align: center;
    padding: 6px 8px;
}

.calendar-editor-block {
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 25px;
}

/* Calendar click to edit rules */
.calendar-day-cell {
    aspect-ratio: 1;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 8px;
    cursor: pointer;
    position: relative;
    transition: var(--transition-smooth);
}

.calendar-day-cell:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.day-status-indicator {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: transparent;
    align-self: center;
    margin-bottom: 5px;
}

.calendar-day-cell.present {
    background: rgba(16, 185, 129, 0.05);
    border-color: rgba(16, 185, 129, 0.25);
}
.calendar-day-cell.present .day-status-indicator {
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
}
.calendar-day-cell.present .day-number {
    color: var(--success);
}

.calendar-day-cell.absent {
    background: rgba(244, 63, 94, 0.05);
    border-color: rgba(244, 63, 94, 0.25);
}
.calendar-day-cell.absent .day-status-indicator {
    background: var(--danger);
    box-shadow: 0 0 6px var(--danger);
}
.calendar-day-cell.absent .day-number {
    color: var(--danger);
}

.calendar-day-cell.late {
    background: rgba(245, 158, 11, 0.05);
    border-color: rgba(245, 158, 11, 0.25);
}
.calendar-day-cell.late .day-status-indicator {
    background: var(--warning);
    box-shadow: 0 0 6px var(--warning);
}
.calendar-day-cell.late .day-number {
    color: var(--warning);
}

/* Fees Editor row styling */
.fee-totals-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

/* Toaster Popup styling */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 9999;
}

.toast-message {
    background: var(--bg-surface-opaque);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    width: 320px;
    transform: translateX(360px);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
}

.toast-icon {
    font-size: 1.4rem;
}

.toast-message.success {
    border-left: 4px solid var(--success);
}
.toast-message.success .toast-icon {
    color: var(--success);
}

.toast-message.error {
    border-left: 4px solid var(--danger);
}
.toast-message.error .toast-icon {
    color: var(--danger);
}

.toast-message.info {
    border-left: 4px solid var(--color-secondary);
}
.toast-message.info .toast-icon {
    color: var(--color-secondary);
}

.toast-content {
    flex-grow: 1;
}

.toast-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-bright);
    margin-bottom: 2px;
}

.toast-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.3;
}

/* Modals overlays styling overrides */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    z-index: 1050;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.25s ease forwards;
}

.modal-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-bright);
    display: flex;
    align-items: center;
    gap: 10px;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.6rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.close-btn:hover {
    color: var(--text-bright);
}

/* Form selects overrides */
.select-input {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 35px;
    cursor: pointer;
}

/* Admin responsive overlays */
@media (max-width: 900px) {
    #admin-app-container {
        flex-direction: column;
    }
    
    .admin-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        height: auto;
    }

    .admin-student-list {
        max-height: 250px;
        padding-bottom: 15px;
    }

    .attendance-editor-dashboard {
        grid-template-columns: 1fr;
    }
}

/* Two-Column Editor Layout */
.workspace-columns-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 30px;
    align-items: start;
    margin-top: 15px;
}

.workspace-left-col {
    min-width: 0; /* Prevents flex items from overflowing */
}

.workspace-right-col {
    position: sticky;
    top: 24px;
    z-index: 5;
}

.sticky-card {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

@media (max-width: 1100px) {
    .workspace-columns-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .workspace-right-col {
        position: static;
        width: 100%;
    }
}

/* Pie Chart Text Styles */
.pie-legend-text {
    fill: #ffffff;
    font-family: var(--font-sans);
}

.pie-legend-score {
    fill: #9CA3AF;
    font-family: var(--font-sans);
}

.pie-tooltip-name {
    fill: #9CA3AF;
    font-family: var(--font-sans);
}

.pie-tooltip-score {
    fill: #ffffff;
    font-family: var(--font-sans);
}

/* Light Mode Overrides */
body.light-mode .pie-legend-text {
    fill: #1f2937;
}

body.light-mode .pie-legend-score {
    fill: #6b7280;
}

body.light-mode .pie-tooltip-name {
    fill: #6b7280;
}

body.light-mode .pie-tooltip-score {
    fill: #1f2937;
}