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

:root {
    --bg: #0f0f0f;
    --surface: #1a1a1a;
    --surface-hover: #242424;
    --border: #2a2a2a;
    --text: #e0e0e0;
    --text-muted: #888;
    --accent: #6c8cff;
    --accent-hover: #8ba4ff;
    --danger: #ff5555;
    --success: #50fa7b;
    --radius: 8px;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.app {
    max-width: 600px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header */

.header {
    text-align: center;
    padding: 1.5rem 0 1rem;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent);
}

/* Input bar */

.input-bar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.input-bar input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.input-bar input:focus {
    border-color: var(--accent);
}

.input-bar input::placeholder {
    color: var(--text-muted);
}

.input-bar button {
    padding: 0.75rem 1rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1.25rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
    line-height: 1;
}

.input-bar button:hover {
    background: var(--accent-hover);
}

/* Tabs */

.tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.tab {
    flex: 1;
    padding: 0.6rem 1rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
}

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

.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Todo list */

.todo-list {
    flex-direction: column;
    gap: 0.5rem;
}

.todo-list:not([hidden]) {
    display: flex;
}

/* Todo item */

.todo-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: background 0.15s;
}

.todo-item:hover {
    background: var(--surface-hover);
}

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* Checkbox */

.todo-checkbox {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    appearance: none;
    border: 2px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
    position: relative;
    margin-top: 2px;
}

.todo-checkbox:hover {
    border-color: var(--accent);
}

.todo-checkbox:checked {
    background: var(--success);
    border-color: var(--success);
}

.todo-checkbox:checked::after {
    content: "\2713";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #000;
    font-size: 12px;
    font-weight: 700;
}

/* Todo content (text + labels) */

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

/* Todo text */

.todo-text {
    font-size: 0.95rem;
    line-height: 1.4;
    word-break: break-word;
    cursor: text;
    padding: 2px 4px;
    border-radius: 4px;
    border: 1px solid transparent;
    display: block;
}

.todo-text:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--bg);
}

/* Label chips on todos */

.todo-labels {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.35rem;
    padding-left: 4px;
}

.label-chip {
    display: inline-flex;
    align-items: center;
    padding: 1px 8px;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 600;
    line-height: 1.6;
    color: #000;
    opacity: 0.9;
}

/* Label picker (dropdown on todo) */

.todo-actions {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
    margin-top: 2px;
    position: relative;
}

.btn-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: 1px solid transparent;
    border-radius: 4px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    transition: color 0.15s, border-color 0.15s;
}

.btn-icon:hover {
    color: var(--text);
    border-color: var(--border);
}

.btn-icon.delete:hover {
    color: var(--danger);
    border-color: var(--danger);
}

.btn-icon.restore:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.btn-icon.label-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

/* Label picker dropdown */

.label-picker {
    position: absolute;
    top: 100%;
    right: 0;
    z-index: 100;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.5rem;
    min-width: 180px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.label-picker-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.25rem;
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.1s;
}

.label-picker-item:hover {
    background: var(--surface-hover);
}

.label-picker-item input[type="checkbox"] {
    accent-color: var(--accent);
}

.label-picker-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.label-picker-name {
    font-size: 0.85rem;
    color: var(--text);
}

.label-picker-empty {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    padding: 0.5rem;
}

/* Labels management panel */

.labels-panel {
    flex-direction: column;
    gap: 0.75rem;
}

.labels-panel:not([hidden]) {
    display: flex;
}

.label-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.label-form input[type="text"] {
    flex: 1;
    padding: 0.6rem 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

.label-form input[type="text"]:focus {
    border-color: var(--accent);
}

.label-form input[type="text"]::placeholder {
    color: var(--text-muted);
}

.label-form input[type="color"] {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    cursor: pointer;
    padding: 2px;
}

.label-form button {
    padding: 0.6rem 0.85rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
    line-height: 1;
}

.label-form button:hover {
    background: var(--accent-hover);
}

/* Label list items (management) */

.labels-list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.label-list-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: background 0.15s;
}

.label-list-item:hover {
    background: var(--surface-hover);
}

.label-list-color {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.label-list-name {
    flex: 1;
    font-size: 0.9rem;
    border: none;
    background: none;
    color: var(--text);
    outline: none;
    padding: 2px 4px;
    border-radius: 4px;
    border: 1px solid transparent;
}

.label-list-name:focus {
    border-color: var(--accent);
    background: var(--bg);
}

.label-list-actions {
    display: flex;
    gap: 0.25rem;
}

/* Color picker hidden input for label editing */

.label-color-input {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    overflow: hidden;
}

/* Empty state */

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.labels-empty {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive: larger screens */

@media (min-width: 768px) {
    .app {
        padding: 2rem;
    }

    .header {
        padding: 2rem 0 1.5rem;
    }

    .header h1 {
        font-size: 1.75rem;
    }
}