:root {
    --bg: #f4f5f7;
    --card-bg: #ffffff;
    --text: #1f2430;
    --muted: #6b7280;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --border: #e5e7eb;
    --danger: #dc2626;
    --success-bg: #ecfdf5;
    --success-text: #047857;
    --error-bg: #fef2f2;
    --error-text: #b91c1c;
    --radius: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.topbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    max-width: 720px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
    text-decoration: none;
}

nav a {
    color: var(--text);
    text-decoration: none;
    margin-left: 16px;
    font-size: 0.95rem;
}

nav a:hover { color: var(--primary); }

.welcome {
    color: var(--muted);
    font-size: 0.9rem;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 28px 20px 60px;
}

.flash {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.flash ul { margin: 0; padding-left: 18px; }

.flash.success { background: var(--success-bg); color: var(--success-text); }
.flash.error { background: var(--error-bg); color: var(--error-text); }

.auth-card, .dashboard-head {
    background: var(--card-bg);
}

.auth-card {
    max-width: 420px;
    margin: 20px auto;
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.auth-card h1 {
    margin-top: 0;
    font-size: 1.4rem;
}

form label {
    display: block;
    margin: 14px 0 6px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--muted);
}

form input[type=text],
form input[type=email],
form input[type=password],
form input[type=date],
form input[type=time],
form select,
form textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
}

form textarea { resize: vertical; }

.time-row {
    display: flex;
    gap: 16px;
}

.time-row > div { flex: 1; }

button, .btn {
    display: inline-block;
    cursor: pointer;
    border: none;
    background: var(--primary);
    color: #fff;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    margin-top: 20px;
}

button:hover, .btn:hover { background: var(--primary-hover); }

.auth-switch {
    margin-top: 18px;
    font-size: 0.9rem;
    color: var(--muted);
}

.auth-switch a { color: var(--primary); }

.dashboard-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.dashboard-head h1 { margin: 0; font-size: 1.5rem; }

.dashboard-head .btn { margin-top: 0; }

.share-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-bottom: 20px;
}

.share-box label {
    display: block;
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 8px;
}

.share-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.share-row input[type=text] {
    flex: 1;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.85rem;
    background: var(--bg);
    color: var(--muted);
}

.share-row button {
    margin: 0;
    padding: 8px 14px;
    font-size: 0.85rem;
    white-space: nowrap;
}

.share-row form { margin: 0; }

.link-danger-btn {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
}

.link-danger-btn:hover {
    background: var(--error-bg);
}

@media (max-width: 480px) {
    .share-row { flex-wrap: wrap; }
    .share-row input[type=text] { flex-basis: 100%; }
}

.filters {
    margin-bottom: 20px;
}

.filters a {
    color: var(--muted);
    text-decoration: none;
    margin-right: 18px;
    padding-bottom: 4px;
    font-size: 0.95rem;
}

.filters a.active {
    color: var(--primary);
    font-weight: 600;
    border-bottom: 2px solid var(--primary);
}

.empty-state {
    color: var(--muted);
    text-align: center;
    padding: 40px 0;
}

.todo-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.todo-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
}

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

.todo-item.done .todo-title { text-decoration: line-through; }

.toggle-form { margin: 0; }

.check-btn {
    width: 26px;
    height: 26px;
    padding: 0;
    margin: 2px 0 0;
    border-radius: 50%;
    border: 2px solid var(--primary);
    background: transparent;
    color: var(--primary);
    font-size: 0.8rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.todo-title { font-weight: 600; font-size: 1.02rem; }

.todo-desc {
    color: var(--muted);
    font-size: 0.9rem;
    margin-top: 4px;
}

.todo-meta {
    margin-top: 8px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 3px 8px;
    font-size: 0.8rem;
    color: var(--muted);
}

.todo-actions {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: flex-end;
    font-size: 0.85rem;
}

.todo-actions a { color: var(--primary); text-decoration: none; }

.todo-actions form { margin: 0; }

.link-danger {
    background: none;
    border: none;
    color: var(--danger);
    padding: 0;
    margin: 0;
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: underline;
}

@media (max-width: 480px) {
    .todo-item { flex-wrap: wrap; }
    .todo-actions { flex-direction: row; align-items: center; }
}