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

:root {
    --bg: #1a1a2e;
    --bg-light: #16213e;
    --text: #eee;
    --text-muted: #888;
    --accent: #e94560;
    --accent-hover: #ff6b6b;
    --success: #4ecdc4;
    --warning: #ffd166;
    --border: #333;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 220px;
    background: var(--bg-light);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 2rem;
    padding-left: 0.5rem;
}

.nav-list {
    list-style: none;
    flex: 1;
}

.nav-list li {
    margin-bottom: 0.25rem;
}

.nav-list a {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--text);
    text-decoration: none;
    border-radius: 6px;
    transition: background 0.2s;
}

.nav-list a:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-list a.active {
    background: var(--accent);
    color: white;
}

.separator {
    height: 1px;
    background: var(--border);
    margin: 1rem 0;
}

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

.calendar-link {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
}

.calendar-link:hover {
    color: var(--text);
}

.calendar-copy-btn {
    display: block;
    width: calc(100% - 1rem);
    margin: 0.5rem;
    padding: 0.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
}

.calendar-copy-btn:hover {
    background: var(--accent-hover);
}

/* Content */
.content {
    flex: 1;
    padding: 2rem;
    max-width: 800px;
}

.page-header {
    margin-bottom: 1.5rem;
}

.page-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Quick Add */
.quick-add {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.quick-add input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
}

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

.quick-add button {
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s;
}

.quick-add button:hover {
    background: var(--accent-hover);
}

/* Task List */
.task-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.task {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-light);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.task.overdue {
    border-color: var(--accent);
}

.task-check {
    width: 24px;
    height: 24px;
    background: transparent;
    border: 2px solid var(--text-muted);
    border-radius: 50%;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.task-check:hover {
    border-color: var(--success);
    color: var(--success);
}

.task-content {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.priority {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
}

.priority-A { background: var(--accent); color: white; }
.priority-B { background: var(--warning); color: black; }
.priority-C { background: var(--text-muted); color: white; }

.task-description {
    font-weight: 500;
}

.task-project {
    font-size: 0.75rem;
    color: var(--accent);
}

.task-context {
    font-size: 0.75rem;
    color: var(--success);
}

.task-due {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.task-due.today {
    color: var(--warning);
}

.task-due.overdue {
    color: var(--accent);
}

.task-recurrence {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.task-calendar {
    font-size: 0.75rem;
}

.task-star {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
}

.task-star:hover,
.task-star.starred {
    color: var(--warning);
}

.task-delete {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    opacity: 0;
    transition: opacity 0.2s;
}

.task:hover .task-delete {
    opacity: 1;
}

.task-delete:hover {
    color: var(--accent);
}

/* Edit Mode */
.task.edit-mode {
    flex-wrap: wrap;
    gap: 0.5rem;
}

.edit-description {
    flex: 1 0 100%;
    padding: 0.5rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text);
    font-size: 1rem;
}

.edit-project,
.edit-date,
.edit-priority {
    padding: 0.375rem 0.5rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text);
    font-size: 0.875rem;
}

.edit-star,
.edit-calendar {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
}

.btn-save,
.btn-cancel {
    padding: 0.375rem 0.75rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
}

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

.btn-cancel {
    background: var(--text-muted);
    color: white;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

/* Mobile */
@media (max-width: 768px) {
    .app {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        flex-direction: row;
        padding: 0.75rem;
        overflow-x: auto;
    }

    .logo {
        margin-bottom: 0;
        margin-right: 1rem;
    }

    .nav-list {
        display: flex;
        gap: 0.5rem;
    }

    .nav-list li {
        margin-bottom: 0;
    }

    .separator,
    .nav-footer {
        display: none;
    }

    .content {
        padding: 1rem;
    }

    .quick-add {
        flex-direction: column;
    }

    .task-content {
        font-size: 0.875rem;
    }
}