/* ==========================================
   UNIBRIDGE CRM - WINDOWS 11 FLUENT DESIGN
   ========================================== */

/* System Fonts - Segoe UI / System UI */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables - Windows 11 Fluent Design System */
:root {
    /* === DARK THEME (Default) === */
    
    /* Background Colors - Deep Neutral Grays */
    --bg-primary: #202020;
    --bg-secondary: #272727;
    --bg-elevated: #2d2d2d;
    --bg-card: #323232;
    --bg-overlay: rgba(0, 0, 0, 0.4);

    /* Mica/Acrylic Effect Backgrounds */
    --mica-bg: rgba(45, 45, 45, 0.85);
    --acrylic-bg: rgba(50, 50, 50, 0.7);

    /* Accent Colors - Windows Blue (Used Sparingly) */
    --accent-primary: #0078d4;
    --accent-primary-hover: #1a86d9;
    --accent-primary-active: #006cbe;
    
    /* Semantic Colors - Muted */
    --accent-success: #107c10;
    --accent-success-bg: rgba(16, 124, 16, 0.15);
    --accent-warning: #ca5010;
    --accent-warning-bg: rgba(202, 80, 16, 0.15);
    --accent-danger: #d13438;
    --accent-danger-bg: rgba(209, 52, 56, 0.15);
    --accent-info: #0078d4;

    /* Text Colors - High Contrast */
    --text-primary: #ffffff;
    --text-secondary: #c5c5c5;
    --text-tertiary: #9a9a9a;
    --text-disabled: #6b6b6b;

    /* Border & Dividers */
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-default: rgba(255, 255, 255, 0.12);
    --border-strong: rgba(255, 255, 255, 0.18);
    --border-focus: var(--accent-primary);

    /* Shadows - Soft Elevation */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.35);

    /* Glass Effects - Subtle */
    --glass-bg: rgba(45, 45, 45, 0.75);
    --glass-border: rgba(255, 255, 255, 0.1);
    --blur-subtle: blur(8px);
    --blur-medium: blur(16px);
    --blur-intense: blur(24px);

    /* Border Radius - Windows 11 Style */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-2xl: 16px;
    --radius-full: 9999px;

    /* Transitions - Fluent Motion */
    --transition-fast: all 0.15s ease-out;
    --transition-base: all 0.2s ease-out;
    --transition-slow: all 0.3s ease-out;

    /* Z-index Scale */
    --z-base: 1;
    --z-elevated: 10;
    --z-modal: 1000;
    --z-notification: 9999;
}

/* Body & Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg-primary);
    font-family: 'Segoe UI', 'Inter', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    color: var(--text-primary);
    line-height: 1.5;
    letter-spacing: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

#app {
    position: relative;
    z-index: 1;
}

/* Main Content Container - Responsive Horizontal Padding */
.main-content-container {
    padding-left: 10%;
    padding-right: 10%;
}

@media (max-width: 1200px) {
    .main-content-container {
        padding-left: 5%;
        padding-right: 5%;
    }
}

@media (max-width: 768px) {
    .main-content-container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

/* Scrollbar Styling - Fluent Design */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border: 2px solid var(--bg-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-card);
}

/* ==========================================
   NAVIGATION BAR - Fluent Design Mica Effect
   ========================================== */

.navbar-glass {
    background: var(--mica-bg);
    -webkit-backdrop-filter: var(--blur-medium);
    backdrop-filter: var(--blur-medium);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-sm);
    padding: 0.5rem 0;
    position: relative;
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand:hover {
    color: var(--text-primary);
}

.navbar-brand i {
    font-size: 1.25rem;
    color: var(--accent-primary);
}

.nav-link-apple {
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    position: relative;
}

.nav-link-apple:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.nav-link-apple.active {
    color: var(--text-primary);
    background: var(--bg-card);
}

.nav-link-apple.active::after {
    content: '';
    position: absolute;
    bottom: 0px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--accent-primary);
    border-radius: var(--radius-full);
}

/* ==========================================
   CARDS & CONTAINERS - Fluent Design Surfaces
   ========================================== */

.card-apple {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
    transition: var(--transition-base);
    overflow: hidden;
}

.card-apple:hover {
    border-color: var(--border-default);
    box-shadow: var(--shadow-md);
}

.student-card {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    padding: 0.875rem 1rem;
    cursor: pointer;
    transition: var(--transition-base);
}

.student-card:hover {
    border-color: var(--border-default);
    background: var(--bg-elevated);
    box-shadow: var(--shadow-sm);
}

.student-card-body {
    position: relative;
    z-index: 1;
}

.student-name {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Ultra-compact pills layout */
.student-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.pill {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    transition: var(--transition-fast);
}

.pill-id {
    background: var(--bg-elevated);
    color: var(--text-secondary);
}

.pill-level {
    background: rgba(0, 120, 212, 0.15);
    color: #60a5fa;
}

.pill-tariff {
    background: var(--accent-success-bg);
    color: #4ade80;
}

/* Student notes ghost text */
.student-notes {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-subtle);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-style: italic;
    line-height: 1.4;
    max-height: 2.8rem;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* Importance indicator - small rounded badge */
.importance-indicator {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--bg-card);
}

/* Deleted student card styling */
.student-card.deleted-student {
    border: 1px solid var(--accent-danger);
    background: var(--accent-danger-bg);
    opacity: 0.8;
}

.student-card.deleted-student:hover {
    border-color: var(--accent-danger);
    background: rgba(209, 52, 56, 0.2);
}

/* Detail modal styles - Compact */
.detail-group {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-subtle);
}

.detail-group:last-child {
    border-bottom: none;
}

.detail-group .detail-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
    display: block;
}

.detail-group .detail-value {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.score-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

/* Copy button styles */
.copyable {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.copy-btn {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.copy-btn:hover {
    background: var(--bg-elevated);
    border-color: var(--border-medium);
    color: var(--text-secondary);
}

.copy-btn.copied {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
}

/* Edit button styles */
.detail-group.editable {
    position: relative;
}

.detail-value-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.action-btns {
    display: flex;
    gap: 0.25rem;
    opacity: 0;
    transition: var(--transition-fast);
}

.detail-group.editable:hover .action-btns,
.detail-group.editable:hover .edit-btn {
    opacity: 1;
}

/* Edit button in detail modal (hidden until hover) */
.detail-group .edit-btn {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    opacity: 0;
    flex-shrink: 0;
}

.detail-group.editable:hover .edit-btn {
    opacity: 1;
}

.detail-group .edit-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

/* Edit field container */
.edit-field {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    padding: 0.25rem;
    margin-top: 0.25rem;
}

.edit-field .form-control,
.edit-field .form-select {
    font-size: 0.85rem;
    padding: 0.375rem 0.5rem;
    border: none;
    background: transparent;
    flex: 1;
    min-width: 0;
}

.edit-field .form-control:focus,
.edit-field .form-select:focus {
    box-shadow: none;
    outline: none;
}

.edit-field .d-flex {
    flex: 1;
    min-width: 0;
}

.edit-actions {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}

.save-btn,
.cancel-btn {
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.save-btn {
    background: var(--accent-green);
    color: white;
}

.save-btn:hover {
    background: #38a169;
}

.cancel-btn {
    background: var(--bg-card);
    color: var(--text-secondary);
}

.cancel-btn:hover {
    background: var(--accent-red);
    color: white;
}

/* ==========================================
   BADGES - Fluent Design Muted Colors
   ========================================== */

.badge {
    padding: 0.25em 0.625em;
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0;
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    text-transform: uppercase;
}

.badge-level {
    background: rgba(0, 120, 212, 0.15);
    color: #60a5fa;
}

.badge-tariff {
    background: var(--accent-success-bg);
    color: #4ade80;
}

.badge-language {
    background: rgba(202, 80, 16, 0.15);
    color: #fb923c;
}

/* ==========================================
   FORM INPUTS - Fluent Design Clean Style
   ========================================== */

.ios-input {
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 400;
    transition: var(--transition-base);
}

.ios-input:hover {
    border-color: var(--border-default);
}

.ios-input:focus {
    background: var(--bg-card);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    box-shadow: 0 0 0 1px var(--accent-primary);
    outline: none;
}

.ios-input::placeholder {
    color: var(--text-tertiary);
    opacity: 1;
    font-weight: 400;
}

.form-select.ios-input {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23a8a9b4' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 16px 12px;
    padding-right: 3rem;
    cursor: pointer;
}

.form-select.ios-input:focus {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%235B8DEF' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e"), linear-gradient(var(--bg-card), var(--bg-card)), var(--gradient-primary);
    background-repeat: no-repeat;
    background-position: right 1rem center, border-box, border-box;
    background-size: 16px 12px, 100% 100%, 100% 100%;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.625rem;
    letter-spacing: -0.01em;
    display: block;
}

.search-wrapper {
    position: relative;
}

.search-icon {
    position: absolute;
    left: 1.125rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    font-size: 1.1rem;
    z-index: 10;
    transition: var(--transition-base);
}

.search-wrapper:focus-within .search-icon {
    color: var(--accent-blue);
}

.hidden-field {
    display: none;
}

/* ==========================================
   BUTTONS - Fluent Design Solid Colors
   ========================================== */

.btn {
    font-weight: 500;
    letter-spacing: 0;
    transition: var(--transition-base);
    border: none;
}

.btn-primary-apple {
    background: var(--accent-primary);
    border: none;
    color: #ffffff;
    font-weight: 600;
}

.btn-primary-apple:hover {
    background: var(--accent-primary-hover);
    color: #ffffff;
}

.btn-primary-apple:active {
    background: var(--accent-primary-active);
}

.shadow-apple {
    box-shadow: var(--shadow-sm);
}

.btn-outline-light {
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    background: transparent;
    transition: var(--transition-base);
}

.btn-outline-light:hover {
    background: var(--bg-elevated);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.btn-outline-secondary {
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    background: transparent;
    transition: var(--transition-base);
}

.btn-outline-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--border-default);
    color: var(--text-primary);
}

.btn-success {
    background: var(--accent-success);
    border: none;
    color: #ffffff;
    font-weight: 600;
}

.btn-success:hover {
    background: #0e6b0e;
    color: #ffffff;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
}

/* Icon Buttons */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
}

.btn-icon:hover {
    background: var(--bg-card);
    border-color: var(--border-default);
    box-shadow: var(--shadow-md);
}

/* ==========================================
   MODALS - Fluent Design Clean Style
   ========================================== */

.modal-glass .modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.modal-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-subtle);
}

.modal-body {
    padding: 1rem 1.25rem;
}

.modal-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-subtle);
}

.modal-backdrop {
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    background-color: var(--bg-overlay);
}

.btn-close {
    filter: brightness(0) invert(1);
    opacity: 0.6;
    transition: var(--transition-base);
    width: 28px;
    height: 28px;
    background-size: 50%;
}

.btn-close:hover {
    opacity: 1;
}

/* ==========================================
   TAB CONTENT SECTIONS - Smooth Transitions
   ========================================== */

.tab-content-section {
    animation: fadeInScale 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }

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

.students-container {
    display: grid;
    gap: 1.25rem;
}

/* ==========================================
   CHEVRON ANIMATION - Smooth Rotation
   ========================================== */

.chevron-icon {
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.student-card.expanded .chevron-icon {
    transform: rotate(180deg);
    color: var(--accent-blue);
}

/* ==========================================
   RESPONSIVE DESIGN - Mobile Optimized
   ========================================== */

@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.25rem;
    }

    .nav-link-apple {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .student-card {
        padding: 1.25rem;
    }

    .student-name {
        font-size: 1.1rem;
    }

    .detail-label {
        min-width: 120px;
        font-size: 0.85rem;
    }

    .detail-value {
        font-size: 0.85rem;
    }

    .modal-body {
        padding: 1.5rem;
    }
}

/* ==========================================
   UTILITY CLASSES - Modern Effects
   ========================================== */

.text-gradient {
    background: var(--text-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.card-hover-effect {
    transition: var(--transition-base);
}

.card-hover-effect:hover {
    transform: translateY(-6px) scale(1.01);
    box-shadow: var(--shadow-lg), var(--shadow-color);
}

/* Loading Animation - Modern Spinner */
.spinner-apple {
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    border: 3px solid transparent;
    border-top-color: var(--accent-blue);
    border-right-color: var(--accent-purple);
    border-radius: 50%;
    animation: spin 0.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Empty State - Enhanced */
.empty-state {
    text-align: center;
    padding: 5rem 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.4;
    margin-bottom: 1.5rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

/* Toast Notifications - Premium */
.toast-notification {
    position: fixed;
    top: 100px;
    right: 24px;
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--blur-intense);
    backdrop-filter: var(--blur-intense);
    border: 1px solid var(--glass-border);
    border-left: 3px solid var(--accent-blue);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.75rem;
    box-shadow: var(--shadow-xl), var(--shadow-color);
    z-index: var(--z-notification);
    animation: slideInRight 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 300px;
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }

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

/* Success/Error States - Vibrant */
.success-state {
    color: var(--accent-mint);
    text-shadow: 0 0 10px rgba(0, 255, 163, 0.3);
}

.error-state {
    color: var(--accent-pink);
    text-shadow: 0 0 10px rgba(247, 107, 138, 0.3);
}

.warning-state {
    color: var(--accent-orange);
    text-shadow: 0 0 10px rgba(255, 107, 157, 0.3);
}

/* Additional Modern Effects */
.glow-effect {
    animation: glow 2s ease-in-out infinite;
}

@keyframes glow {

    0%,
    100% {
        box-shadow: 0 0 20px rgba(91, 141, 239, 0.3);
    }

    50% {
        box-shadow: 0 0 40px rgba(91, 141, 239, 0.6);
    }
}

/* Frosted Glass Panels */
.glass-panel {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--blur-medium);
    backdrop-filter: var(--blur-medium);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

/* Student Checkbox List - Excel Export Modal */
.student-checkbox-list .student-checkbox-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.student-checkbox-list .student-checkbox-item:hover {
    background: var(--bg-card);
    border-color: var(--border-medium);
}

.student-checkbox-list .student-checkbox-item.selected {
    background: rgba(72, 187, 120, 0.1);
    border-color: rgba(72, 187, 120, 0.3);
}

.student-checkbox-list .form-check-input {
    margin-right: 0.75rem;
    width: 1.1rem;
    height: 1.1rem;
    cursor: pointer;
}

.student-checkbox-list .student-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.student-checkbox-list .student-id {
    font-weight: 700;
    color: var(--accent-blue);
    font-size: 0.9rem;
    min-width: 50px;
}

.student-checkbox-list .student-name {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.student-checkbox-list .student-level {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    padding: 0.25rem 0.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    margin-left: auto;
}

/* ==========================================
   PAYMENTS SECTION STYLES
   ========================================== */

/* Payment Tab Buttons */
#payments-tab .btn-group .btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--text-primary);
}

/* Compact Payment Student Card */
.payment-student-card-compact {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--blur-medium);
    backdrop-filter: var(--blur-medium);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    padding: 0.875rem 1rem;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.payment-student-card-compact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-success);
    opacity: 0.4;
    transition: var(--transition-base);
}

.payment-student-card-compact:hover {
    border-color: var(--border-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-accent);
}

.payment-student-card-compact:hover::before {
    opacity: 1;
}

.student-name-compact {
    font-size: 0.95rem;
    font-weight: 600;
    font-family: 'Space Grotesk', sans-serif;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.payment-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.payment-pills .pill {
    padding: 0.2rem 0.5rem;
    font-size: 0.65rem;
}

.pill-balance {
    background: var(--bg-elevated);
    color: var(--text-secondary);
}

.pill-balance.bal-positive {
    background: rgba(72, 187, 120, 0.15);
    color: #48bb78;
}

.pill-balance.bal-negative {
    background: rgba(245, 101, 101, 0.15);
    color: #f56565;
}

.pill-discount {
    background: rgba(157, 123, 234, 0.15);
    color: var(--accent-purple);
}

/* Payment Student Card */
.payment-student-card {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--blur-medium);
    backdrop-filter: var(--blur-medium);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    padding: 1.25rem;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.payment-student-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-success);
    opacity: 0.5;
    transition: var(--transition-base);
}

.payment-student-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), var(--shadow-accent);
}

.payment-student-card:hover::before {
    opacity: 1;
}

.payment-student-card .student-id-badge {
    background: var(--bg-elevated);
    color: var(--accent-blue);
    font-weight: 700;
    font-size: 0.85rem;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-full);
    display: inline-block;
    margin-bottom: 0.5rem;
}

.payment-student-card .student-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.payment-student-card .student-tariff {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background: var(--gradient-secondary);
    border-radius: var(--radius-full);
    color: white;
    font-weight: 600;
    display: inline-block;
}

.payment-student-card .balance-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
}

.payment-student-card .balance-item {
    text-align: center;
    flex: 1;
}

.payment-student-card .balance-label {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 0.25rem;
}

.payment-student-card .balance-value {
    font-size: 1rem;
    font-weight: 700;
    font-family: 'Space Grotesk', sans-serif;
}

.payment-student-card .balance-value.positive {
    color: #48bb78;
}

.payment-student-card .balance-value.negative {
    color: #f56565;
}

.payment-student-card .balance-value.neutral {
    color: var(--text-secondary);
}

/* Payment History Card */
.payment-history-card {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--blur-medium);
    backdrop-filter: var(--blur-medium);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    padding: 1.25rem;
    transition: var(--transition-base);
    position: relative;
}

.payment-history-card:hover {
    border-color: var(--border-medium);
    box-shadow: var(--shadow-md);
}

.payment-history-card .payment-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.payment-history-card .payment-amount {
    font-size: 1.25rem;
    font-weight: 700;
    font-family: 'Space Grotesk', sans-serif;
    color: #48bb78;
}

.payment-history-card .payment-timestamp {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.payment-history-card .payment-details {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.payment-history-card .payment-badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    text-transform: uppercase;
}

.payment-history-card .payment-method {
    background: rgba(91, 141, 239, 0.15);
    color: var(--accent-blue);
}

.payment-history-card .payment-receiver {
    background: rgba(157, 123, 234, 0.15);
    color: var(--accent-purple);
}

.payment-history-card .payment-student-info {
    background: var(--bg-elevated);
    color: var(--text-secondary);
}

.payment-history-card .payment-notes {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-subtle);
    font-style: italic;
}

/* Quick Note Pills */
.quick-note-pill {
    font-size: 0.75rem;
    padding: 0.35rem 0.75rem;
    border-color: var(--border-medium);
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.quick-note-pill:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

/* ==========================================
   LOADING BUTTON STATES
   ========================================== */

.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.85;
}

.btn-loading .btn-text {
    visibility: hidden;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 18px;
    margin-top: -9px;
    margin-left: -9px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: btn-spinner 0.6s linear infinite;
}

.btn-outline-danger.btn-loading::after,
.btn-outline-primary.btn-loading::after {
    border: 2px solid rgba(100, 100, 100, 0.3);
    border-top-color: currentColor;
}

@keyframes btn-spinner {
    to {
        transform: rotate(360deg);
    }
}

/* Confirmation Modal Styles */
.confirm-modal .modal-content {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--blur-intense);
    backdrop-filter: var(--blur-intense);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
}

.confirm-modal .modal-header {
    border-bottom: 1px solid var(--border-subtle);
    padding: 1.25rem 1.5rem;
}

.confirm-modal .modal-body {
    padding: 1.5rem;
    text-align: center;
}

.confirm-modal .modal-body i {
    font-size: 3rem;
    color: var(--accent-orange);
    margin-bottom: 1rem;
    display: block;
}

.confirm-modal .modal-body p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
}

.confirm-modal .modal-footer {
    border-top: 1px solid var(--border-subtle);
    padding: 1rem 1.5rem;
    gap: 0.5rem;
}

/* ==========================================
   THEME TOGGLE - iOS Style Switch
   ========================================== */

.theme-toggle-wrapper {
    display: flex;
    align-items: center;
}

.theme-toggle {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 32px;
    cursor: pointer;
}

.theme-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6px;
}

.theme-toggle-slider::before {
    content: '';
    position: absolute;
    height: 26px;
    width: 26px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: var(--transition-base);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    z-index: 2;
}

.theme-toggle-slider .sun-icon,
.theme-toggle-slider .moon-icon {
    font-size: 0.85rem;
    z-index: 1;
    transition: var(--transition-fast);
}

.theme-toggle-slider .sun-icon {
    color: rgba(255, 255, 255, 0.4);
}

.theme-toggle-slider .moon-icon {
    color: white;
}

/* Checked state (light mode) */
.theme-toggle input:checked+.theme-toggle-slider {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
}

.theme-toggle input:checked+.theme-toggle-slider::before {
    transform: translateX(28px);
}

.theme-toggle input:checked+.theme-toggle-slider .sun-icon {
    color: white;
}

.theme-toggle input:checked+.theme-toggle-slider .moon-icon {
    color: rgba(255, 255, 255, 0.4);
}

/* ==========================================
   SETTINGS LIST STYLES
   ========================================== */

.settings-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.settings-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.settings-item:hover {
    border-color: var(--border-medium);
    background: var(--bg-card);
}

.settings-item-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
    min-width: 0;
}

.settings-item-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.settings-item-meta {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    background: var(--bg-primary);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-full);
}

.settings-item-actions {
    display: flex;
    gap: 0.5rem;
}

.settings-item-btn {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-default);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.85rem;
}

.settings-item-btn:hover {
    background: var(--bg-card);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.settings-item-btn.edit-btn {
    color: var(--accent-primary);
}

.settings-item-btn.edit-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.settings-item-btn.delete-btn:hover {
    background: #e53e3e;
    border-color: #e53e3e;
    color: white;
}

/* University group header */
.settings-group-header {
    padding: 0.625rem 1rem;
    background: var(--gradient-dark);
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    margin-top: 1rem;
}

.settings-group-header:first-child {
    margin-top: 0;
}

.settings-group-header h6 {
    margin: 0;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

/* ==========================================
   LIGHT THEME - Windows 11 Fluent Design
   ========================================== */

[data-bs-theme="light"] {
    /* Background Colors - Soft Whites */
    --bg-primary: #f3f3f3;
    --bg-secondary: #fafafa;
    --bg-elevated: #ffffff;
    --bg-card: #ffffff;
    --bg-overlay: rgba(255, 255, 255, 0.8);

    /* Mica/Acrylic Effect Backgrounds */
    --mica-bg: rgba(255, 255, 255, 0.9);
    --acrylic-bg: rgba(255, 255, 255, 0.75);

    /* Glass Effects */
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(0, 0, 0, 0.06);

    /* Text Colors - Dark for Readability */
    --text-primary: #1a1a1a;
    --text-secondary: #5c5c5c;
    --text-tertiary: #7a7a7a;
    --text-disabled: #a0a0a0;

    /* Border & Dividers */
    --border-subtle: rgba(0, 0, 0, 0.06);
    --border-default: rgba(0, 0, 0, 0.10);
    --border-strong: rgba(0, 0, 0, 0.15);

    /* Shadows - Softer for Light Mode */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.10);
    --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.12);

    /* Semantic Colors for Light Mode */
    --accent-success-bg: rgba(16, 124, 16, 0.12);
    --accent-warning-bg: rgba(202, 80, 16, 0.12);
    --accent-danger-bg: rgba(209, 52, 56, 0.12);
}

[data-bs-theme="light"] body {
    background: var(--bg-primary);
}

[data-bs-theme="light"] .navbar-glass {
    background: var(--mica-bg);
    border-bottom-color: var(--border-subtle);
}

[data-bs-theme="light"] .btn-close-white {
    filter: none;
}

[data-bs-theme="light"] .student-card {
    box-shadow: var(--shadow-sm);
}

[data-bs-theme="light"] .pill-level {
    background: rgba(0, 120, 212, 0.12);
    color: #0078d4;
}

[data-bs-theme="light"] .pill-tariff {
    background: var(--accent-success-bg);
    color: #107c10;
}

[data-bs-theme="light"] .badge-level {
    background: rgba(0, 120, 212, 0.12);
    color: #0078d4;
}

[data-bs-theme="light"] .badge-tariff {
    background: var(--accent-success-bg);
    color: #107c10;
}

[data-bs-theme="light"] .card-apple {
    box-shadow: var(--shadow-sm);
}

/* ==========================================
   UTILITY CLASSES - Moved from Inline Styles
   ========================================== */

/* Filter select elements */
.filter-select-tariff,
.filter-select-level,
.filter-select-payment {
    max-width: 200px;
}

/* Icons - Large */
.icon-brand {
    font-size: 1.5rem;
}

.icon-empty-state {
    font-size: 4rem;
    opacity: 0.3;
}

/* Search wrapper max width */
.search-wrapper-md {
    max-width: 350px;
}

.search-wrapper-lg {
    max-width: 800px;
}

/* Filter select smaller variant */
.filter-select-compact {
    max-width: 180px;
}

/* Text transform utilities */
.text-uppercase-input {
    text-transform: uppercase;
}

/* Deleted option styling */
.option-deleted {
    font-style: italic;
    color: #e53e3e;
}

/* Input group text styling */
.input-group-text-styled {
    background: var(--bg-elevated);
    border-color: var(--border-subtle);
    color: var(--text-secondary);
}

/* Max height scroll container */
.scroll-container-md {
    max-height: 400px;
    overflow-y: auto;
}

/* Readonly input styling */
.input-readonly {
    background: var(--bg-elevated);
    opacity: 0.7;
}

/* Hidden sections */
.section-hidden {
    display: none;
}

.section-visible {
    display: block;
}