:root {
    --font-scale: 1;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --settings-text-color: #ffffff;
    
    /* Default dark theme colors */
    --bg-solid: #0a0a12;
    --bg-grad-start: #0a0a12;
    --bg-grad-mid: #121227;
    --bg-grad-end: #0a0a12;
    --shape-dark: #0c0c18;
    --shape-light: #1a1a26;
    --title-color: #ffffff;
    --box-bg-start: #070707;
    --box-bg-end: #1d1d1d;
    --text-color: #ffffff;
    --btn-bg: rgba(255,255,255,0.06);
    --btn-border: rgba(255,255,255,0.08);
    --accent: #7aa2ff;
    
    /* Grade system colors */
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-bg: #ecf0f1;
    --dark-bg: #2c3e50;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #bdc3c7;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    
    --grade-f: #e74c3c;
    --grade-d: #e67e22;
    --grade-c: #f39c12;
    --grade-b: #27ae60;
    --grade-a: #2980b9;
}

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

html, body {
    width: 100%;
    height: 100%;
    font-family: var(--font-family);
    font-size: calc(16px * var(--font-scale));
    background-color: var(--bg-solid);
    background-image: linear-gradient(180deg, var(--bg-grad-start) 0%, var(--bg-grad-mid) 40%, var(--bg-grad-end) 100%);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    overflow: hidden;
}

#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.app-container {
    width: 100%;
    height: 100vh;
    display: flex;
    position: relative;
    overflow: hidden;
}

.page {
    display: none;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.page.active {
    display: flex;
}

/* LOGIN PAGE */
#login-page {
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-grad-start) 0%, var(--bg-grad-mid) 50%, var(--bg-grad-end) 100%);
}

.login-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
}

.login-box {
    background: linear-gradient(180deg, rgba(12,14,28,0.95), rgba(9,10,20,0.95));
    border-radius: 16px;
    padding: 42px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.45);
    border: 1px solid rgba(255,255,255,0.08);
    backdrop-filter: blur(12px);
}

.login-box h1 {
    color: var(--accent);
    margin-bottom: 10px;
    text-align: center;
    letter-spacing: 0.5px;
}

.login-box .subtitle {
    text-align: center;
    color: var(--text-color);
    margin-bottom: 30px;
    font-size: 0.9rem;
    opacity: 0.8;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 600;
    opacity: 0.9;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
    background: rgba(255,255,255,0.04);
    color: var(--text-color);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(122, 162, 255, 0.2);
}

.btn-primary,
.btn-secondary,
.btn-danger {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #5a8cff);
    color: white;
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(90, 140, 255, 0.25);
}

.btn-primary:hover {
    opacity: 0.95;
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(90, 140, 255, 0.35);
}

.btn-secondary {
    background-color: var(--btn-bg);
    color: var(--text-color);
    border: 2px solid var(--btn-border);
}

.btn-secondary:hover {
    background-color: var(--btn-border);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #c0392b;
}

.error-message {
    color: var(--danger-color);
    text-align: center;
    margin-top: 15px;
    padding: 10px;
    background-color: rgba(231, 76, 60, 0.2);
    border-radius: 5px;
}

.demo-info {
    text-align: center;
    color: var(--text-color);
    margin-top: 20px;
    font-size: 0.85rem;
    opacity: 0.7;
}

/* DASHBOARD */
#dashboard-page {
    flex-direction: column;
    background: var(--bg-solid);
}

.navbar {
    background: var(--shape-dark);
    padding: 20px 30px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 3px solid var(--accent);
    position: relative;
}

.navbar-left {
    display: flex;
    gap: 30px;
    align-items: center;
}

.navbar-brand {
    color: var(--title-color);
    margin: 0;
    font-size: 1.5rem;
}

.navbar-right {
    display: flex;
    gap: 10px;
    align-items: center;
}

.user-info {
    display: flex;
    gap: 12px;
    align-items: center;
}

.user-info span {
    font-weight: 600;
    color: var(--text-color);
}

.role-badge {
    background: linear-gradient(135deg, var(--accent), #5a8cff);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(122, 162, 255, 0.3);
}

#logout-btn {
    background: var(--btn-bg);
    border: 2px solid var(--btn-border);
    color: var(--text-color);
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

#logout-btn:hover {
    background: var(--btn-border);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.dashboard-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    height: calc(100vh - 80px);
}

.sidebar {
    width: 250px;
    background: var(--shape-dark);
    border-right: 1px solid var(--btn-border);
    padding: 20px 0;
    overflow-y: auto;
}

.menu {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 0 10px;
}

.menu-item {
    padding: 15px 20px;
    border: none;
    background: none;
    cursor: pointer;
    text-align: left;
    font-size: 1rem;
    color: var(--text-color);
    border-left: 4px solid transparent;
    transition: all 0.3s;
    display: flex;
    gap: 10px;
    align-items: center;
}

.menu-item:hover {
    background-color: var(--btn-bg);
    border-left-color: var(--accent);
}

.menu-item.active {
    background-color: var(--accent);
    color: white;
    border-left-color: var(--accent);
}

.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
    background: var(--bg-solid);
}

.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.view h1 {
    margin-bottom: 30px;
    color: var(--title-color);
}

.toolbar {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-box,
.filter-select {
    padding: 10px 15px;
    border: 2px solid var(--btn-border);
    border-radius: 5px;
    font-size: 1rem;
    background-color: var(--shape-dark);
    color: var(--text-color);
}

.search-box {
    flex: 1;
    min-width: 200px;
}

.filter-select {
    min-width: 150px;
}

/* DASHBOARD GRID */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.card {
    background: var(--shape-dark);
    border-radius: 10px;
    padding: 25px;
    box-shadow: var(--shadow);
}

.card h3 {
    margin-bottom: 20px;
    color: var(--title-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.stat-box {
    background: var(--shape-dark);
    color: var(--text-color);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border: 2px solid var(--accent);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 5px;
    color: var(--accent);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    color: var(--text-color);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.activity-item {
    padding: 12px;
    background: var(--btn-bg);
    border-left: 4px solid var(--accent);
    border-radius: 4px;
}

.activity-time {
    font-size: 0.85rem;
    color: var(--text-color);
    opacity: 0.7;
}

/* CLASSES VIEW */
.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.class-card {
    background: var(--shape-dark);
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: all 0.3s;
}

.class-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.class-card h3 {
    color: var(--accent);
    margin-bottom: 10px;
}

.class-card .class-info {
    color: var(--text-color);
    font-size: 0.9rem;
    margin-bottom: 15px;
    opacity: 0.8;
}

.class-card .student-count {
    background: var(--accent);
    color: white;
    padding: 8px 12px;
    border-radius: 20px;
    display: inline-block;
    font-weight: bold;
}

/* STUDENTS TABLE */
.table-responsive {
    overflow-x: auto;
    background: var(--shape-dark);
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background-color: var(--accent);
    color: white;
}

.data-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.data-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--btn-border);
    color: var(--text-color);
}

.data-table tbody tr:hover {
    background-color: var(--btn-bg);
    .hidden {
        display: none !important;
    }
}

.grade-cell {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.grade-badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.grade-badge:hover {
    transform: scale(1.05);
}

.grade-badge.editable:hover {
    opacity: 0.8;
}

/* COLOR GRADIENT FOR GRADES (Red to Green) */
.grade-badge {
    color: white;
}

.grade-0 { background-color: #e74c3c; } /* Red - F */
.grade-20 { background-color: #e74c3c; } /* Red - F */
.grade-40 { background-color: #e67e22; } /* Orange - D */
.grade-60 { background-color: #f39c12; } /* Yellow - C */
.grade-80 { background-color: #27ae60; } /* Green - B */
.grade-100 { background-color: #2980b9; } /* Blue - A */

.average-cell {
    font-weight: bold;
    padding: 8px 12px;
    border-radius: 5px;
    color: white;
}

.sort-options {
    margin-bottom: 20px;
    display: flex;
    gap: 20px;
}

.sort-options label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.sort-options input {
    cursor: pointer;
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.action-buttons button {
    padding: 6px 12px;
    font-size: 0.85rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-edit:hover {
    background-color: var(--accent);
    opacity: 0.8;
}

.btn-remove {
    background-color: var(--danger-color);
    color: white;
}

.btn-remove:hover {
    background-color: #c0392b;
}

/* MODALS */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    animation: fadeIn 0.3s;
}

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

.modal-content {
    background: var(--shape-dark);
    border-radius: 10px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    color: var(--text-color);
}

#class-test-modal .modal-content {
    background: linear-gradient(180deg, rgba(12,14,28,0.96), rgba(9,10,20,0.96));
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 28px 70px rgba(0,0,0,0.5);
    color: var(--text-color);
}

#class-test-modal .modal-header h2 {
    color: var(--title-color);
    font-weight: 700;
    letter-spacing: 0.4px;
}

#class-test-modal .form-group label,
#class-test-modal .test-info p {
    color: var(--text-color);
    opacity: 0.85;
}

#class-test-modal input,
#class-test-modal select {
    background: rgba(255,255,255,0.04);
    color: var(--text-color);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 10px;
}

#class-test-modal input:focus,
#class-test-modal select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(122, 162, 255, 0.2);
}

#class-test-modal .btn-primary {
    background: linear-gradient(135deg, var(--accent), #5a8cff);
    border-radius: 10px;
    box-shadow: 0 12px 30px rgba(90, 140, 255, 0.25);
}

#class-test-modal .btn-secondary {
    border-radius: 10px;
}

.modal-large {
    max-width: 800px;
}

.test-step {
    width: 100%;
}

.test-info {
    background: rgba(255,255,255,0.05);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.08);
}

.test-info h3 {
    margin: 0 0 10px 0;
    color: var(--accent);
}

.test-info p {
    margin: 0;
    color: var(--text-color);
    opacity: 0.8;
}

.student-grades-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-height: 400px;
    overflow-y: auto;
    padding: 8px;
}

.student-grades-list::-webkit-scrollbar {
    width: 10px;
}

.student-grades-list::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.05);
    border-radius: 999px;
}

.student-grades-list::-webkit-scrollbar-thumb {
    background: rgba(122, 162, 255, 0.5);
    border-radius: 999px;
    border: 2px solid rgba(0,0,0,0.2);
}

.student-grades-list::-webkit-scrollbar-thumb:hover {
    background: rgba(122, 162, 255, 0.7);
}

.student-grade-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: rgba(255,255,255,0.04);
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.08);
}

.student-grade-item .student-name {
    flex: 1;
    font-weight: 600;
    color: var(--text-color);
}

.student-grade-item input {
    width: 100px;
    padding: 8px 12px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 10px;
    font-size: 1rem;
    text-align: center;
    background: rgba(255,255,255,0.04);
    color: var(--text-color);
}

.student-grade-item input:focus {
    outline: none;
    border-color: var(--accent);
}

.student-grade-item .grade-unit {
    color: var(--text-color);
    font-weight: 600;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.modal-header h2 {
    margin: 0;
    color: var(--title-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-color);
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--accent);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.form-full {
    grid-column: 1 / -1;
}

.modal-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 25px;
}

.modal-confirm {
    max-width: 400px;
    text-align: center;
}

.modal-confirm p {
    margin-bottom: 25px;
    color: var(--text-color);
}

/* REPORTS */
.report {
    background: var(--shape-dark);
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
}

.report h2 {
    margin-bottom: 25px;
    color: var(--accent);
}

.report-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
}

.stat-card {
    background: linear-gradient(135deg, var(--accent), var(--shape-dark));
    color: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.stat-card .stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 10px;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: bold;
}

.report-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
}

/* ADMIN VIEW */
.admin-section {
    background: var(--shape-dark);
    border-radius: 10px;
    padding: 25px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.admin-section h2 {
    margin-bottom: 20px;
    color: var(--title-color);
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .dashboard-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .menu {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .menu-item {
        flex: 1;
        min-width: 100px;
        border-left: none;
        border-bottom: 4px solid transparent;
    }
    
    .menu-item.active {
        border-left: none;
        border-bottom-color: var(--primary-color);
    }
    
    .main-content {
        padding: 15px;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .classes-grid {
        grid-template-columns: 1fr;
    }
    
    .toolbar {
        flex-direction: column;
    }
    
    .search-box {
        width: 100%;
    }
    
    .filter-select {
        width: 100%;
    }
    
    .data-table {
        font-size: 0.9rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    .login-box {
        padding: 20px;
    }
    
    .navbar {
        flex-direction: column;
        gap: 15px;
    }
    
    .modal-content {
        width: 95%;
        padding: 20px;
    }
}

/* PRINT STYLES */
@media print {
    body {
        background: white;
    }
    
    .navbar,
    .sidebar,
    .toolbar,
    .sort-options,
    .report-actions,
    .modal,
    .settings {
        display: none !important;
    }
    
    .main-content {
        padding: 0;
    }
    
    .report {
        box-shadow: none;
    }
}

/* SETTINGS PANEL */
.settings {
    position: relative;
    top: auto;
    left: auto;
    right: auto;
    z-index: 1000;
    display: flex;
    gap: 0.5rem;
    align-items: center;
    isolation: isolate;
    mix-blend-mode: normal;
}

@media (max-width: 720px) {
    .settings {
        top: auto;
        left: auto;
        right: auto;
        flex-direction: row;
        align-items: flex-start;
        max-width: calc(100% - 1rem);
    }
}

.hamburger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.45rem 0.9rem;
    background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
    border: 1px solid rgba(255,255,255,0.06);
    cursor: pointer;
    color: var(--settings-text-color);
    font-weight: 700;
    border-radius: 0.6rem;
    transition: background 0.14s ease, color 0.14s ease, transform 0.14s ease, box-shadow 0.14s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    box-shadow: 0 6px 18px rgba(3,6,20,0.35);
}

.hamburger:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(3,6,20,0.45);
}

.hamburger.open {
    background: var(--btn-bg);
    color: var(--text-color);
    transform: translateY(-1px);
}

.settings-panel {
    min-width: 240px;
    background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
    border-radius: 0.6rem;
    padding: 1rem;
    box-shadow: 0 8px 30px rgba(0,0,0,0.35);
    display: none;
    gap: 0.75rem;
    flex-direction: column;
    align-items: stretch;
    color: var(--settings-text-color);
    position: absolute;
    top: calc(100% + 0.6rem);
    right: 0;
    z-index: 1001;
    mix-blend-mode: normal;
}

.settings-panel.open {
    display: flex;
}

@media (max-width: 720px) {
    .settings-panel {
        max-height: calc(100vh - 5rem);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        background: linear-gradient(180deg, var(--box-bg-start), var(--box-bg-end));
        padding: 1.25rem;
        border: 1px solid var(--btn-border);
    }
}

.settings-panel h4 {
    color: var(--settings-text-color);
    margin: 0.75rem 0;
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.settings-panel h4:first-child {
    margin-top: 0;
}

.settings-panel .controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.settings-panel label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 0.35rem;
}

.settings-panel input[type="range"] {
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
    width: 100%;
    height: 28px;
    padding: 8px 0;
    vertical-align: middle;
    background: transparent;
}

.swatches {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 15px;
}

.theme-swatch {
    background: none;
    border: 2px solid var(--btn-border);
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--settings-text-color);
    font-size: 0.8rem;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.theme-swatch:hover {
    border-color: var(--accent);
    transform: scale(1.05);
}

.theme-swatch[aria-pressed="true"] {
    border-color: var(--accent);
    background: var(--btn-bg);
    box-shadow: 0 0 12px rgba(122, 162, 255, 0.3);
}

.swatch-preview {
    width: 30px;
    height: 30px;
    border-radius: 6px;
    display: block;
}

.theme-swatch[data-theme="dark"] .swatch-preview { background: linear-gradient(135deg, #0b0b10, #151522); }
.theme-swatch[data-theme="light"] .swatch-preview { background: linear-gradient(135deg, #f4f7fb, #e9eef6); }
.theme-swatch[data-theme="ocean"] .swatch-preview { background: linear-gradient(135deg, #003e66, #006b9a); }
.theme-swatch[data-theme="sunset"] .swatch-preview { background: linear-gradient(135deg, #ffecd2, #ff7b54); }
.theme-swatch[data-theme="forest"] .swatch-preview { background: linear-gradient(135deg, #0b3b2b, #1d6b4f); }
.theme-swatch[data-theme="aurora"] .swatch-preview { background: linear-gradient(135deg, #0a2b2f, #2d0b3b); }
.theme-swatch[data-theme="retro"] .swatch-preview { background: linear-gradient(135deg, #f6e7c1, #e8b26a); }
.theme-swatch[data-theme="solar"] .swatch-preview { background: linear-gradient(135deg, #fff6b3, #ffb056); }
.theme-swatch[data-theme="midnight"] .swatch-preview { background: linear-gradient(135deg, #02021b, #17173d); }
.theme-swatch[data-theme="lava"] .swatch-preview { background: linear-gradient(135deg, #6b0000, #ff8066); }
.theme-swatch[data-theme="pink"] .swatch-preview { background: linear-gradient(135deg, #ffd6e8, #ffb0d6); }
.theme-swatch[data-theme="galaxy"] .swatch-preview { background: linear-gradient(135deg, #0b0821, #4b0d7a); }

.controls {
    color: var(--text-color);
}

.controls label {
    color: var(--text-color);
    font-size: 0.9rem;
}

.controls input[type="range"] {
    width: 100%;
    cursor: pointer;
}

.controls input[type="checkbox"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}

/* THEME DEFINITIONS */
[data-theme="dark"] {
    --settings-text-color: #ffffff;
    --bg-solid: #0a0a12;
    --bg-grad-start: #0a0a12;
    --bg-grad-mid: #121227;
    --bg-grad-end: #0a0a12;
    --shape-dark: #0c0c18;
    --shape-light: #1a1a26;
    --title-color: #ffffff;
    --box-bg-start: #070707;
    --box-bg-end: #1d1d1d;
    --text-color: #ffffff;
    --btn-bg: rgba(255,255,255,0.06);
    --btn-border: rgba(255,255,255,0.08);
    --accent: #7aa2ff;
}

[data-theme="light"] {
    --settings-text-color: #0b1222;
    --bg-solid: #f6f8fc;
    --bg-grad-start: #f6f8fc;
    --bg-grad-mid: #eef2f8;
    --bg-grad-end: #e6ecf6;
    --shape-dark: #ffffff;
    --shape-light: #ffffff;
    --title-color: #0b1222;
    --box-bg-start: #e4e4e4;
    --box-bg-end: #d4d4d4;
    --text-color: #0b1222;
    --btn-bg: rgba(0,0,0,0.06);
    --btn-border: rgba(0,0,0,0.08);
    --accent: #4a79ff;
}

[data-theme="ocean"] {
    --settings-text-color: #ffffff;
    --bg-solid: #012a44;
    --bg-grad-start: #012a44;
    --bg-grad-mid: #024b6f;
    --bg-grad-end: #012a44;
    --shape-dark: #063652;
    --shape-light: #88daf8;
    --title-color: #aeefff;
    --box-bg-start: #024b6f;
    --box-bg-end: #006b9a;
    --text-color: #e8f9ff;
    --btn-bg: rgba(255,255,255,0.06);
    --btn-border: rgba(255,255,255,0.08);
    --accent: #2ec4ff;
}

[data-theme="sunset"] {
    --settings-text-color: #0b1222;
    --bg-solid: #ffe0c2;
    --bg-grad-start: #ffe9d6;  
    --bg-grad-mid: #ffb98c;    
    --bg-grad-end: #ff7a4a;  
    --shape-dark: #ffcba3;
    --shape-light: #fff0e6;
    --title-color: #3b2f2f;
    --box-bg-start: #ffb98c;
    --box-bg-end: #ff7a4a;
    --text-color: #2b1f1f;
    --btn-bg: rgba(0,0,0,0.06);
    --btn-border: rgba(0,0,0,0.08);
    --accent: #ff5926;
}

[data-theme="forest"] {
    --settings-text-color: #ffffff;
    --bg-solid: #08231a;
    --bg-grad-start: #08231a;
    --bg-grad-mid: #0c3a2b;
    --bg-grad-end: #08231a;
    --shape-dark: #0a2b22;
    --shape-light: #a6f5cf;
    --title-color: #dfffe9;
    --box-bg-start: #0c3a2b;
    --box-bg-end: #1d6b4f;
    --text-color: #eafff4;
    --btn-bg: rgba(255,255,255,0.06);
    --btn-border: rgba(255,255,255,0.08);
    --accent: #6be6b5;
}

[data-theme="aurora"] {
    --settings-text-color: #ffffff;
    --bg-solid: #071a24;
    --bg-grad-start: #071a24;  
    --bg-grad-mid: #0f3646;   
    --bg-grad-end: #2a0e3a;     
    --shape-dark: rgba(40, 255, 190, 0.28);
    --shape-light: rgba(150, 255, 230, 0.22);
    --title-color: #dff7ff;
    --box-bg-start: #10384a;
    --box-bg-end: #2a0e3a;
    --text-color: #e9fffb;
    --btn-bg: rgba(255,255,255,0.06);
    --btn-border: rgba(255,255,255,0.08);
    --accent: #72f7d2;
}

[data-theme="retro"] {
    --settings-text-color: #0b1222;
    --bg-solid: #f4e2ba;
    --bg-grad-start: #fff4d4;  
    --bg-grad-mid: #f0c47c;    
    --bg-grad-end: #d88f3f;   
    --shape-dark: #f0cfa0;
    --shape-light: #fff6ec;
    --title-color: #4a3020;
    --box-bg-start: #f0c47c;
    --box-bg-end: #d88f3f;
    --text-color: #3d2718;
    --btn-bg: rgba(0,0,0,0.06);
    --btn-border: rgba(0,0,0,0.08);
    --accent: #ff9f1c;
}

[data-theme="solar"] {
    --settings-text-color: #0b1222;
    --bg-solid: #fff3aa;
    --bg-grad-start: #fffad3; 
    --bg-grad-mid: #ffd16f;   
    --bg-grad-end: #ff9a2f; 
    --shape-dark: #ffe7a8;
    --shape-light: #fff7df;
    --title-color: #3b2b00;
    --box-bg-start: #ffd16f;
    --box-bg-end: #ff9a2f;
    --text-color: #3b2b00;
    --btn-bg: rgba(0,0,0,0.06);
    --btn-border: rgba(0,0,0,0.08);
    --accent: #ffb400;
}

[data-theme="midnight"] {
    --settings-text-color: #ffffff;
    --bg-solid: #050522;
    --bg-grad-start: #050522;
    --bg-grad-mid: #0d0d2f;
    --bg-grad-end: #050522;
    --shape-dark: #070731;
    --shape-light: #1a1a3a;
    --title-color: #dfe7ff;
    --box-bg-start: #0d0d2f;
    --box-bg-end: #17173d;
    --text-color: #e9f0ff;
    --btn-bg: rgba(255,255,255,0.06);
    --btn-border: rgba(255,255,255,0.08);
    --accent: #7aa2ff;
}

[data-theme="lava"] {
    --settings-text-color: #ffffff;
    --bg-solid: #2a0000;
    --bg-grad-start: #2a0000;
    --bg-grad-mid: #5a0000;
    --bg-grad-end: #2a0000;
    --shape-dark: #3a0000;
    --shape-light: #ffbbaa;
    --title-color: #fff0f0;
    --box-bg-start: #5a0000;
    --box-bg-end: #ff8066;
    --text-color: #fff3f1;
    --btn-bg: rgba(255,255,255,0.06);
    --btn-border: rgba(255,255,255,0.08);
    --accent: #ff615a;
}

[data-theme="pink"] {
    --settings-text-color: #0b1222;
    --bg-solid: #ffe9f3;
    --bg-grad-start: #ffe9f3;
    --bg-grad-mid: #ffc2e3;
    --bg-grad-end: #ff9ed3;
    --shape-dark: #ffb4dc;
    --shape-light: #fff5fb;
    --title-color: #2b0c1a;
    --box-bg-start: #ffc7e8;
    --box-bg-end: #ff9ed3;
    --text-color: #2b0c1a;
    --btn-bg: rgba(0,0,0,0.07);
    --btn-border: rgba(0,0,0,0.1);
    --accent: #ff49b5;
}

[data-theme="galaxy"] {
    --settings-text-color: #ffffff;
    --bg-solid: #06021a;
    --bg-grad-start: #06021a;
    --bg-grad-mid: #2c0d3b;
    --bg-grad-end: #0b0821;
    --shape-dark: #0a0620;
    --shape-light: #4d3263;
    --title-color: #f9eaff;
    --box-bg-start: #2c0d3b;
    --box-bg-end: #4b0d7a;
    --text-color: #f0eaff;
    --btn-bg: rgba(255,255,255,0.06);
    --btn-border: rgba(255,255,255,0.08);
    --accent: #a77aff;
}