/* Task App Styles — Telegram Mini App */

:root {
    /* Telegram theme variables (will be overridden by Telegram) */
    --tg-theme-bg-color: #ffffff;
    --tg-theme-text-color: #000000;
    --tg-theme-hint-color: #999999;
    --tg-theme-link-color: #2481cc;
    --tg-theme-button-color: #2481cc;
    --tg-theme-button-text-color: #ffffff;
    --tg-theme-secondary-bg-color: #f4f4f5;
    
    /* Custom colors */
    --overdue-color: #dc3545;
    --success-color: #28a745;
    --border-color: #e5e5e5;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    line-height: 1.5;
    min-height: 100vh;
    padding-bottom: env(safe-area-inset-bottom);
}

#app {
    max-width: 600px;
    margin: 0 auto;
    padding: 0;
}

/* Header */
header {
    background: var(--tg-theme-bg-color);
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.sync-status {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

.sync-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--tg-theme-hint-color);
    font-size: 18px;
    transition: transform 0.2s, color 0.2s;
    padding: 0;
    line-height: 1;
}

.sync-btn:hover {
    color: var(--tg-theme-link-color);
    border-color: var(--tg-theme-link-color);
}

.sync-btn.syncing .sync-icon {
    display: inline-block;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Legacy fallback — matches old header where sync-status was a plain div */
#sync-status {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

header h1 {
    font-size: 20px;
    font-weight: 600;
}

#sync-status {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

/* Tabs */
.tabs {
    display: flex;
    background: var(--tg-theme-bg-color);
    padding: 8px 16px;
    gap: 8px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-bottom: 1px solid var(--border-color);
}

.tab {
    padding: 8px 16px;
    border: none;
    background: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.tab:hover {
    background: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
    opacity: 0.8;
}

.tab.active {
    background: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
}

/* Task List */
main {
    padding: 16px;
}

.section-header {
    font-size: 13px;
    font-weight: 600;
    color: var(--tg-theme-hint-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 16px 0 8px 4px;
}

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

/* Task Card */
.task-card {
    background: var(--tg-theme-bg-color);
    border-radius: 12px;
    padding: 14px 16px;
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    transition: transform 0.1s ease, box-shadow 0.2s ease;
}

.task-card:active {
    transform: scale(0.98);
}

.task-checkbox {
    width: 24px;
    height: 24px;
    border: 2px solid var(--tg-theme-hint-color);
    border-radius: 50%;
    flex-shrink: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.task-checkbox:hover {
    border-color: var(--tg-theme-button-color);
}

.task-checkbox.completed {
    background: var(--success-color);
    border-color: var(--success-color);
}

.task-checkbox.completed::after {
    content: '✓';
    color: white;
    font-size: 14px;
    font-weight: bold;
}

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

.task-text {
    font-size: 15px;
    word-wrap: break-word;
}

.task-card.completed .task-text {
    text-decoration: line-through;
    color: var(--tg-theme-hint-color);
}

.task-meta {
    display: flex;
    gap: 12px;
    margin-top: 6px;
    font-size: 13px;
    color: var(--tg-theme-hint-color);
}

.task-due {
    display: flex;
    align-items: center;
    gap: 4px;
}

.task-due.overdue {
    color: var(--overdue-color);
    font-weight: 500;
}

.task-section-badge {
    background: var(--tg-theme-secondary-bg-color);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    text-transform: capitalize;
}

/* Loading State */
.loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--tg-theme-hint-color);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--tg-theme-hint-color);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

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

/* Error State */
.error {
    text-align: center;
    padding: 40px 20px;
    color: var(--overdue-color);
}

/* High Priority */
.task-card.high-priority {
    border-left: 3px solid var(--overdue-color);
}

.task-card.high-priority .task-text {
    font-weight: 500;
}

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

.task-card {
    animation: fadeIn 0.3s ease;
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--tg-theme-text-color);
    color: var(--tg-theme-bg-color);
    padding: 12px 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    max-width: calc(100% - 40px);
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.error {
    background: var(--overdue-color);
    color: white;
}

.toast-message {
    font-size: 14px;
    font-weight: 500;
}

.toast-undo {
    background: transparent;
    border: 1px solid currentColor;
    color: inherit;
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: opacity 0.2s ease;
}

.toast-undo:hover {
    opacity: 0.8;
}

.toast-undo:active {
    opacity: 0.6;
}

/* Dark mode adjustments */
@media (prefers-color-scheme: dark) {
    :root {
        --border-color: #2c2c2e;
    }
}