/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light Mode Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;
    --border-color: #e9ecef;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    
    /* Brand Colors */
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #eff6ff;
    
    /* Status Colors */
    --success: #22c55e;
    --success-light: #dcfce7;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    
    /* Difficulty Colors */
    --easy: #22c55e;
    --easy-bg: #dcfce7;
    --medium: #f59e0b;
    --medium-bg: #fef3c7;
    --hard: #ef4444;
    --hard-bg: #fee2e2;
    
    /* Layout */
    --nav-height: 64px;
    --container-max: 1200px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

/* Dark Mode */
body.dark-mode {
    --bg-primary: #1a1a1a;
    --bg-secondary: #0f0f0f;
    --bg-tertiary: #262626;
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-tertiary: #737373;
    --border-color: #333333;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
    --accent-light: #1e3a8a;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    height: var(--nav-height);
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 3px var(--shadow);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

.logo-icon {
    font-size: 1.75rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.nav-link:hover {
    color: var(--accent-primary);
}

.nav-link.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

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

/* Buttons */
.btn-primary, .btn-secondary {
    padding: 0.6rem 1.25rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--accent-primary) 0%, #6366f1 100%);
    padding: 4rem 0;
    color: white;
}

.hero-content {
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* Filters */
.filters {
    background: var(--bg-primary);
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: var(--nav-height);
    z-index: 100;
    backdrop-filter: blur(10px);
}

.filters .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    gap: 0.75rem;
}

.filter-btn {
    padding: 0.5rem 1.25rem;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.filter-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.filter-btn.easy.active {
    background: var(--easy);
    border-color: var(--easy);
}

.filter-btn.medium.active {
    background: var(--medium);
    border-color: var(--medium);
}

.filter-btn.hard.active {
    background: var(--hard);
    border-color: var(--hard);
}

.search-box {
    flex: 0 1 300px;
}

.search-input {
    width: 100%;
    padding: 0.6rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Problems Section */
.problems-section {
    padding: 2rem 0;
}

.topic-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.75rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.topic-card:hover {
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

/* Topic Header with Toggle */
.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    gap: 2rem;
    flex-wrap: wrap;
    cursor: pointer;
    user-select: none;
}

.topic-header:hover {
    opacity: 0.9;
}

.topic-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.toggle-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-secondary);
    transition: var(--transition);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-btn:hover {
    color: var(--accent-primary);
    transform: scale(1.1);
}

.toggle-icon {
    transition: transform 0.3s ease;
    display: inline-block;
}

.topic-card.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.topic-card.collapsed .problems-list {
    display: none;
}

.topic-card.collapsed {
    margin-bottom: 1rem;
}

.topic-info {
    flex: 1;
}

.topic-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.topic-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.topic-progress {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.5rem;
    min-width: 200px;
}

.progress-text {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.progress-bar {
    width: 200px;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 100px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), #6366f1);
    border-radius: 100px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Problems List */
.problems-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.problem-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    border: 1px solid transparent;
}

.problem-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    transform: translateX(4px);
}

.problem-item.completed {
    opacity: 0.6;
}

.problem-checkbox {
    position: relative;
}

.problem-checkbox input[type="checkbox"] {
    appearance: none;
    width: 22px;
    height: 22px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
}

.problem-checkbox input[type="checkbox"]:hover {
    border-color: var(--accent-primary);
}

.problem-checkbox input[type="checkbox"]:checked {
    background: var(--success);
    border-color: var(--success);
}

.problem-checkbox input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 14px;
    font-weight: bold;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.problem-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.problem-title {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.problem-title:hover {
    color: var(--accent-primary);
}

/* Badges */
.badge {
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-easy {
    background: var(--easy-bg);
    color: var(--easy);
}

.badge-medium {
    background: var(--medium-bg);
    color: var(--medium);
}

.badge-hard {
    background: var(--hard-bg);
    color: var(--danger);
}

/* Roadmap Section */
.roadmap-section {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.roadmap {
    display: grid;
    gap: 1.5rem;
    position: relative;
}

.roadmap::before {
    content: '';
    position: absolute;
    left: 23px;
    top: 30px;
    bottom: 30px;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-primary), #6366f1);
}

.roadmap-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    position: relative;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.roadmap-item:hover {
    transform: translateX(8px);
    box-shadow: 0 4px 12px var(--shadow);
}

.roadmap-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-primary), #6366f1);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    z-index: 1;
}

.roadmap-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.roadmap-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Resources Section */
.resources-section {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.resource-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow);
}

.resource-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.resource-card ul {
    list-style: none;
}

.resource-card li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.resource-card li:last-child {
    border-bottom: none;
}

.resource-card li:hover {
    color: var(--accent-primary);
    padding-left: 0.5rem;
    transition: var(--transition);
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 0.75rem;
    transition: var(--transition);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--accent-primary);
    padding-left: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-stats {
        gap: 1.5rem;
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .filters .container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }
    
    .search-box {
        flex: 1;
        width: 100%;
    }
    
    .topic-header {
        flex-direction: column;
    }
    
    .topic-progress {
        align-items: flex-start;
        width: 100%;
    }
    
    .progress-bar {
        width: 100%;
    }
    
    .problem-item {
        flex-direction: row;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .roadmap::before {
        left: 15px;
    }
    
    .roadmap-number {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.topic-card {
    animation: fadeIn 0.5s ease-out;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

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

/* Selection */
::selection {
    background: var(--accent-primary);
    color: white;
}

/* Focus Styles */
button:focus,
input:focus,
a:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Hidden elements for filtering */
.hidden {
    display: none !important;
}

/* ============================================ */
/* Settings Modal */
/* ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    animation: fadeIn 0.3s ease-out;
}

.modal.active {
    display: block;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    max-width: 600px;
    margin: 50px auto;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px var(--shadow);
    max-height: calc(100vh - 100px);
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.close-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-secondary);
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: var(--danger-light);
    color: var(--danger);
    transform: rotate(90deg);
}

.modal-body {
    padding: 2rem;
}

.settings-section {
    margin-bottom: 2rem;
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-primary);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    margin-bottom: 1rem;
    gap: 1rem;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-info {
    flex: 1;
}

.setting-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    display: block;
    margin-bottom: 0.25rem;
}

.setting-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
    flex-shrink: 0;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: var(--transition);
    border-radius: 34px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition);
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider {
    background: linear-gradient(135deg, var(--accent-primary), #6366f1);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

.toggle-switch input:focus + .toggle-slider {
    box-shadow: 0 0 0 3px var(--accent-light);
}

/* Danger Button */
.btn-danger {
    padding: 0.6rem 1.25rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

/* Stats Grid in Settings */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    text-align: center;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.stat-card-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.stat-card-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.modal-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* Responsive Modal */
@media (max-width: 768px) {
    .modal-content {
        margin: 20px;
        max-height: calc(100vh - 40px);
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 1.5rem;
    }
    
    .setting-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .toggle-switch {
        align-self: flex-end;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================ */
/* Authentication Modals */
/* ============================================ */
.auth-modal {
    max-width: 450px;
}

.auth-form {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.form-group small {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.btn-block {
    width: 100%;
    justify-content: center;
    position: relative;
}

.btn-loader {
    position: absolute;
    right: 1rem;
}

.auth-divider {
    text-align: center;
    position: relative;
    margin: 1.5rem 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background: var(--border-color);
}

.auth-divider::before {
    left: 0;
}

.auth-divider::after {
    right: 0;
}

.auth-divider span {
    background: var(--bg-primary);
    padding: 0 1rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.btn-google {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.btn-google:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-switch a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
}

.auth-switch a:hover {
    text-decoration: underline;
}

/* ============================================ */
/* User Menu */
/* ============================================ */
.user-menu {
    position: relative;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), #6366f1);
    color: white;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-avatar:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.user-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 250px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 24px var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1001;
}

.user-menu.active .user-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-info {
    padding: 1rem;
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.user-email {
    font-size: 0.85rem;
    color: var(--text-secondary);
    word-break: break-all;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.5rem 0;
}

.dropdown-item {
    width: 100%;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-primary);
    text-align: left;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-item:hover {
    background: var(--bg-secondary);
}

.dropdown-item:last-child {
    color: var(--danger);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.dropdown-item:last-child:hover {
    background: var(--danger-light);
}

/* Auth Loading State */
.auth-loading .btn-text {
    display: none;
}

.auth-loading .btn-loader {
    display: inline !important;
}

/* Notification Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    box-shadow: 0 8px 24px var(--shadow);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    z-index: 10001;
    animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

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

.toast.info {
    border-left: 4px solid var(--accent-primary);
}

.toast-message {
    color: var(--text-primary);
    font-weight: 500;
}


/* ============================================ */
/* Donate Button & Modal */
/* ============================================ */
.donate-btn {
    margin-top: 20px;
    padding: 12px 30px;
    background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    color: white;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.donate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.5);
}

.donate-modal {
    max-width: 500px;
}

.donate-content {
    text-align: center;
}

.donate-content > p {
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.6;
}

.upi-section {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 12px;
    margin: 25px 0;
}

.upi-section h3 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 18px;
}

.upi-id-box {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-primary);
    padding: 15px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    margin: 15px 0;
}

.upi-id-box code {
    flex: 1;
    font-size: 16px;
    color: var(--primary);
    font-weight: 600;
}

.copy-btn {
    padding: 8px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.copy-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.upi-note {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 10px;
}

.thank-you {
    margin-top: 25px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(99, 102, 241, 0.1) 100%);
    border-radius: 8px;
}

.thank-you p {
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.made-by {
    margin-top: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.made-by strong {
    color: var(--primary);
    font-weight: 600;
}