/* Skip Link */
.skip-link { position:absolute; top:-40px; left:0; background:#2980b9; color:#fff; padding:8px 16px; z-index:10001; transition:top 0.3s; font-size:14px; text-decoration:none; }
.skip-link:focus { top:0; }

/* App Loader */
.app-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #0f0f23;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.app-loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(41, 128, 185, 0.2);
    border-top-color: #2980b9;
    border-radius: 50%;
    animation: loaderSpin 0.8s linear infinite;
}

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

/* Pulse animation for CTA buttons */
@keyframes pulse-cta {
    0% { box-shadow: 0 0 0 0 rgba(41, 128, 185, 0.5); }
    70% { box-shadow: 0 0 0 12px rgba(41, 128, 185, 0); }
    100% { box-shadow: 0 0 0 0 rgba(41, 128, 185, 0); }
}

.btn-primary.pulse {
    animation: pulse-cta 2s infinite;
}

/* Highlight input field for first-time users */
@keyframes input-glow {
    0%, 100% { box-shadow: 0 0 0 2px rgba(41, 128, 185, 0.3); }
    50% { box-shadow: 0 0 0 4px rgba(41, 128, 185, 0.6); }
}

.input-todo.highlight {
    animation: input-glow 2s ease-in-out 3;
}

/* 2026 Modern UI/UX Trends */

:root {
    --color-primary: #2980b9;
    --color-primary-dark: #1e5fa8;
    --color-primary-light: #3498db;
    --color-bg-dark: #0f0f23;
    --color-bg-dark-alt: #16172b;
    --color-bg-light: #ffffff;
    --color-text-dark: #e8e8f0;
    --color-text-light: #0f0f23;
    --color-border-dark: #1e1e3a;
    --color-border-light: #e0e0e8;
    --color-success: #27ae60;
    --color-warning: #f39c12;
    --color-danger: #e74c3c;
    --color-glass: rgba(41, 128, 185, 0.1);

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
    width: 100%;
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-bg-dark-alt) 100%);
    color: var(--color-text-dark);
    overflow-x: hidden;
}

body.light-mode {
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
    color: var(--color-text-light);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-primary-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

body.light-mode ::-webkit-scrollbar-thumb {
    background: var(--color-primary);
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 900px;
    margin: 0 auto;
}

/* Header */
.header {
    background: rgba(41, 128, 185, 0.15);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-dark);
    padding: var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition);
}

body.light-mode .header {
    background: rgba(41, 128, 185, 0.08);
    border-bottom-color: var(--color-border-light);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.header h1 {
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--color-text-dark);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
}

body.light-mode .btn-icon {
    color: var(--color-text-light);
}

.btn-icon:hover {
    background: rgba(41, 128, 185, 0.2);
    transform: scale(1.1);
}

/* Language Selector */
.language-selector {
    position: relative;
}

.lang-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: rgba(22, 23, 43, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
    min-width: 200px;
    z-index: 1000;
    overflow: hidden;
    animation: slideDown 0.3s ease-out;
}

body.light-mode .lang-menu {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--color-border-light);
}

.lang-menu.hidden {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.lang-option {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--color-text-dark);
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
    font-size: 14px;
}

body.light-mode .lang-option {
    color: var(--color-text-light);
}

.lang-option:hover {
    background: rgba(41, 128, 185, 0.2);
}

/* Progress Section */
.progress-section {
    margin-top: var(--spacing-lg);
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: 14px;
}

.progress-percent {
    font-weight: 600;
    color: var(--color-primary-light);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    border-radius: 4px;
    transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    width: 0%;
}

.progress-stats {
    font-size: 12px;
    color: rgba(232, 232, 240, 0.7);
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

/* Ad Containers */
.ad-container {
    padding: var(--spacing-md);
    text-align: center;
    background: rgba(41, 128, 185, 0.05);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    min-height: 90px;
}

.ad-container ins {
    display: inline-block;
}

/* Input Section */
.input-section {
    background: rgba(41, 128, 185, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-dark);
    margin-bottom: var(--spacing-lg);
    transition: var(--transition);
}

body.light-mode .input-section {
    background: rgba(41, 128, 185, 0.05);
    border-color: var(--color-border-light);
}

.input-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.input-todo {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    color: var(--color-text-dark);
    font-size: 16px;
    transition: var(--transition);
    outline: none;
}

body.light-mode .input-todo {
    background: rgba(0, 0, 0, 0.02);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

.input-todo:focus {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.1);
}

.input-todo::placeholder {
    color: rgba(232, 232, 240, 0.5);
}

body.light-mode .input-todo::placeholder {
    color: rgba(15, 15, 35, 0.5);
}

.btn-primary {
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border: none;
    color: white;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    min-width: 44px;
    min-height: 44px;
    font-size: 14px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(41, 128, 185, 0.4);
}

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

/* Filter Controls */
.filter-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

@media (max-width: 640px) {
    .filter-controls {
        flex-direction: column;
    }
}

.priority-select, .category-select {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 14px;
}

.priority-select label, .category-select label {
    white-space: nowrap;
}

.priority-select select, .category-select select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--color-border-dark);
    color: var(--color-text-dark);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

body.light-mode .priority-select select,
body.light-mode .category-select select {
    background: rgba(0, 0, 0, 0.02);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

/* Filter Buttons */
.filter-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--color-border-dark);
    color: var(--color-text-dark);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    font-size: 13px;
    min-height: 36px;
}

body.light-mode .filter-btn {
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-color: transparent;
    color: white;
}

.filter-btn:hover:not(.active) {
    border-color: var(--color-primary);
    color: var(--color-primary-light);
}

/* Search Box */
.search-box {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-md) var(--spacing-lg);
    padding-left: 40px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    color: var(--color-text-dark);
    font-size: 14px;
    transition: var(--transition);
    outline: none;
}

body.light-mode .search-input {
    background: rgba(0, 0, 0, 0.02);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

.search-input:focus {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.1);
}

.search-box svg {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: rgba(232, 232, 240, 0.5);
    pointer-events: none;
}

body.light-mode .search-box svg {
    color: rgba(15, 15, 35, 0.5);
}

/* Todo Section */
.todo-section {
    margin-bottom: var(--spacing-lg);
}

.todo-list {
    list-style: none;
}

.todo-item {
    background: rgba(41, 128, 185, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    transition: var(--transition);
    cursor: grab;
    animation: slideIn 0.3s ease-out;
}

body.light-mode .todo-item {
    background: rgba(41, 128, 185, 0.05);
    border-color: var(--color-border-light);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.todo-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(41, 128, 185, 0.2);
}

.todo-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

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

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: rgba(232, 232, 240, 0.5);
}

body.light-mode .todo-item.completed .todo-text {
    color: rgba(15, 15, 35, 0.5);
}

.todo-checkbox {
    min-width: 24px;
    width: 24px;
    height: 24px;
    cursor: pointer;
    margin-top: 2px;
    accent-color: var(--color-primary);
}

.todo-content {
    flex: 1;
    min-width: 0;
}

.todo-header {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
}

.todo-text {
    flex: 1;
    font-size: 15px;
    word-break: break-word;
    color: var(--color-text-dark);
    transition: var(--transition);
}

body.light-mode .todo-text {
    color: var(--color-text-light);
}

.priority-badge {
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    display: inline-flex;
    align-items: center;
}

.priority-badge.high {
    background: rgba(231, 76, 60, 0.2);
    color: #ff6b6b;
}

.priority-badge.medium {
    background: rgba(243, 156, 18, 0.2);
    color: #ffc107;
}

.priority-badge.low {
    background: rgba(39, 174, 96, 0.2);
    color: #4caf50;
}

.category-badge {
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(41, 128, 185, 0.2);
    display: inline-flex;
    align-items: center;
}

.due-date {
    font-size: 12px;
    color: rgba(232, 232, 240, 0.7);
    display: flex;
    align-items: center;
    gap: 4px;
}

body.light-mode .due-date {
    color: rgba(15, 15, 35, 0.7);
}

.due-date.overdue {
    color: #ff6b6b;
}

.todo-meta {
    font-size: 12px;
    color: rgba(232, 232, 240, 0.6);
    margin-top: var(--spacing-xs);
}

body.light-mode .todo-meta {
    color: rgba(15, 15, 35, 0.6);
}

.todo-notes {
    margin-top: 4px;
    color: rgba(232, 232, 240, 0.6);
}

body.light-mode .todo-notes,
[data-theme="light"] .todo-notes {
    color: rgba(15, 15, 35, 0.6);
}

.todo-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-edit, .btn-delete {
    background: transparent;
    border: none;
    color: var(--color-text-dark);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    min-width: 36px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

body.light-mode .btn-edit,
body.light-mode .btn-delete {
    color: var(--color-text-light);
}

.btn-edit:hover {
    background: rgba(41, 128, 185, 0.2);
    color: var(--color-primary-light);
}

.btn-delete:hover {
    background: rgba(231, 76, 60, 0.2);
    color: #ff6b6b;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: rgba(232, 232, 240, 0.6);
}

body.light-mode .empty-state {
    color: rgba(15, 15, 35, 0.6);
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
}

.empty-state.hidden {
    display: none;
}

/* Stats Section */
.stats-section {
    background: rgba(41, 128, 185, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

body.light-mode .stats-section {
    background: rgba(41, 128, 185, 0.05);
    border-color: var(--color-border-light);
}

.stats-section h2 {
    font-size: 18px;
    margin-bottom: var(--spacing-lg);
}

.stats-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

@media (max-width: 640px) {
    .stats-container {
        grid-template-columns: 1fr;
    }
}

.stat-chart {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.stat-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: rgba(232, 232, 240, 0.7);
}

body.light-mode .stat-label {
    color: rgba(15, 15, 35, 0.7);
}

.chart-bars {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
    height: 120px;
    justify-content: space-around;
}

.chart-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    flex: 1;
}

.chart-bar .bar {
    width: 100%;
    background: linear-gradient(180deg, var(--color-primary-light), var(--color-primary));
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    min-height: 4px;
    transition: height 0.3s ease-out;
}

.chart-bar span {
    font-size: 11px;
    color: rgba(232, 232, 240, 0.6);
}

body.light-mode .chart-bar span {
    color: rgba(15, 15, 35, 0.6);
}

.stat-summary {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    justify-content: center;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-primary-light);
    display: block;
}

/* Premium Section */
.premium-section {
    margin-bottom: var(--spacing-lg);
}

.premium-card {
    background: linear-gradient(135deg, rgba(41, 128, 185, 0.2), rgba(52, 152, 219, 0.1));
    border: 2px dashed var(--color-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
}

body.light-mode .premium-card {
    background: linear-gradient(135deg, rgba(41, 128, 185, 0.1), rgba(52, 152, 219, 0.05));
}

.premium-card h3 {
    font-size: 18px;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-light);
}

.premium-card p {
    font-size: 14px;
    color: rgba(232, 232, 240, 0.7);
    margin-bottom: var(--spacing-md);
}

body.light-mode .premium-card p {
    color: rgba(15, 15, 35, 0.7);
}

.btn-premium {
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border: none;
    color: white;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    min-height: 44px;
}

.btn-premium:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(41, 128, 185, 0.4);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-lg);
    animation: fadeIn 0.3s ease-out;
}

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

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--color-bg-dark-alt);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease-out;
    border: 1px solid var(--color-border-dark);
    position: relative;
}

body.light-mode .modal-content {
    background: var(--color-bg-light);
    border-color: var(--color-border-light);
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-content.modal-wide {
    max-width: 700px;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--color-text-dark);
    font-size: 28px;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

body.light-mode .modal-close {
    color: var(--color-text-light);
}

.modal-close:hover {
    background: rgba(41, 128, 185, 0.2);
    border-radius: var(--radius-md);
}

.modal-content h2 {
    font-size: 20px;
    margin-bottom: var(--spacing-lg);
    padding-right: 40px;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    color: rgba(232, 232, 240, 0.7);
}

body.light-mode .form-group label {
    color: rgba(15, 15, 35, 0.7);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    color: var(--color-text-dark);
    font-family: inherit;
    font-size: 14px;
    transition: var(--transition);
    outline: none;
}

body.light-mode .form-input,
body.light-mode .form-select,
body.light-mode .form-textarea {
    background: rgba(0, 0, 0, 0.02);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.1);
}

.form-textarea {
    resize: vertical;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.btn-secondary {
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: 1px solid var(--color-border-dark);
    color: var(--color-text-dark);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
    min-height: 44px;
}

body.light-mode .btn-secondary {
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

.btn-secondary:hover {
    background: rgba(41, 128, 185, 0.1);
}

.btn-primary {
    flex: 1;
}

/* Premium Content */
.premium-content {
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading {
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(41, 128, 185, 0.2);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.analysis-result {
    text-align: left;
}

.analysis-item {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(41, 128, 185, 0.1);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

body.light-mode .analysis-item {
    background: rgba(41, 128, 185, 0.05);
}

.analysis-item h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-light);
}

.analysis-item p {
    font-size: 14px;
    line-height: 1.5;
    color: rgba(232, 232, 240, 0.8);
}

body.light-mode .analysis-item p {
    color: rgba(15, 15, 35, 0.8);
}

/* Light Mode via data-theme attribute */
[data-theme="light"],
[data-theme="light"] body {
    --color-bg-dark: #f5f5fa;
    --color-bg-dark-alt: #ffffff;
    --color-text-dark: #1a1a2e;
    --color-text-light: #1a1a2e;
    --color-border-dark: #e0e0e8;
    --color-border-light: #e0e0e8;
}

[data-theme="light"] body {
    background: linear-gradient(135deg, #f5f5fa 0%, #ffffff 100%);
    color: var(--color-text-light);
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
    background: var(--color-primary);
}

[data-theme="light"] .header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--color-border-light);
}

[data-theme="light"] .btn-icon {
    color: var(--color-text-light);
}

[data-theme="light"] .btn-icon:hover {
    background-color: rgba(41, 128, 185, 0.1);
}

[data-theme="light"] .lang-menu {
    background-color: rgba(255, 255, 255, 0.95);
    border-color: var(--color-border-light);
}

[data-theme="light"] .lang-option {
    color: var(--color-text-light);
}

[data-theme="light"] .lang-option:hover {
    background-color: rgba(41, 128, 185, 0.1);
}

[data-theme="light"] .input-section {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--color-border-light);
}

[data-theme="light"] .input-todo {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

[data-theme="light"] .input-todo::placeholder {
    color: rgba(26, 26, 46, 0.5);
}

[data-theme="light"] .priority-select select,
[data-theme="light"] .category-select select {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

[data-theme="light"] .filter-btn {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

[data-theme="light"] .filter-btn.active {
    background: var(--color-primary);
    color: white;
}

[data-theme="light"] .search-input {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

[data-theme="light"] .search-box svg {
    color: var(--color-text-light);
}

[data-theme="light"] .todo-item {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--color-border-light);
}

[data-theme="light"] .todo-item.completed .todo-text {
    color: rgba(26, 26, 46, 0.5);
}

[data-theme="light"] .todo-text {
    color: #1a1a2e;
}

[data-theme="light"] .priority-badge {
    color: #1a1a2e;
}

[data-theme="light"] .priority-badge.high {
    color: #c0392b;
}

[data-theme="light"] .priority-badge.medium {
    color: #d68910;
}

[data-theme="light"] .priority-badge.low {
    color: #1e8449;
}

[data-theme="light"] .category-badge {
    color: #1a5276;
}

[data-theme="light"] .due-date {
    color: rgba(26, 26, 46, 0.7);
}

[data-theme="light"] .todo-meta {
    color: rgba(26, 26, 46, 0.6);
}

[data-theme="light"] .btn-edit,
[data-theme="light"] .btn-delete {
    color: var(--color-text-light);
}

[data-theme="light"] .empty-state {
    color: rgba(26, 26, 46, 0.6);
}

[data-theme="light"] .stats-section {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--color-border-light);
}

[data-theme="light"] .stat-label {
    color: rgba(26, 26, 46, 0.7);
}

[data-theme="light"] .chart-bar span {
    color: rgba(26, 26, 46, 0.7);
}

[data-theme="light"] .premium-card {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--color-border-light);
}

[data-theme="light"] .premium-card p {
    color: rgba(26, 26, 46, 0.8);
}

[data-theme="light"] .modal-content {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--color-border-light);
}

[data-theme="light"] .modal-close {
    color: var(--color-text-light);
}

[data-theme="light"] .form-group label {
    color: rgba(26, 26, 46, 0.8);
}

[data-theme="light"] .form-input,
[data-theme="light"] .form-select,
[data-theme="light"] .form-textarea {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

[data-theme="light"] .btn-secondary {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--color-border-light);
    color: var(--color-text-light);
}

[data-theme="light"] .analysis-item p {
    color: rgba(15, 15, 35, 0.8);
}

.theme-toggle {
    position: fixed;
    top: 12px;
    right: 56px;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="light"] .theme-toggle {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.1);
}

/* Confetti Canvas */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 999;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-md);
    }

    .header h1 {
        font-size: 24px;
    }

    .main-content {
        padding: var(--spacing-md);
    }

    .input-section {
        padding: var(--spacing-md);
    }

    .stats-container {
        grid-template-columns: 1fr;
    }

    .modal-content {
        max-width: 90%;
    }
}

@media (max-width: 480px) {
    .header-top {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }

    .header-controls {
        align-self: flex-end;
    }

    .input-group {
        flex-direction: column;
    }

    .btn-primary {
        width: 100%;
    }

    .filter-buttons {
        flex-wrap: wrap;
    }

    .todo-header {
        gap: 4px;
    }

    .todo-item {
        padding: var(--spacing-md);
    }

    .todo-actions {
        align-self: flex-end;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-color-scheme: light) {
    body {
        background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
        color: var(--color-text-light);
    }
}