:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-alt: #eef3f8;
    --text: #172033;
    --muted: #64748b;
    --line: #d9e1ec;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #15803d;
    --danger: #dc2626;
    --warning: #b45309;
    --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--text);
    background: var(--bg);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.5;
}

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

input,
textarea,
button {
    font: inherit;
}

input,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 11px 12px;
    color: var(--text);
    background: #fff;
}

textarea {
    resize: vertical;
}

label span {
    display: block;
    margin-bottom: 6px;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 650;
}

.app-shell {
    min-height: 100vh;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px clamp(16px, 4vw, 42px);
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
}

.brand {
    color: var(--text);
    font-size: 1.05rem;
    font-weight: 800;
}

.topbar-user,
.card-actions,
.item-actions,
.item-footer,
.filters {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.main {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 56px;
}

.page-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 22px;
}

.page-heading h1,
.auth-panel h1 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.05;
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

.auth-panel,
.empty-state,
.toolbar-panel,
.add-item-panel,
.checklist-card,
.item-card {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.auth-panel {
    width: min(460px, 100%);
    margin: 44px auto;
    padding: 28px;
}

.form,
.quick-create,
.title-form,
.item-create-form,
.item-edit-form {
    display: grid;
    gap: 14px;
}

.form {
    margin-top: 24px;
}

.quick-create {
    grid-template-columns: minmax(190px, 280px) auto;
    align-items: end;
}

.title-form {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
}

.item-create-form,
.item-edit-form {
    grid-template-columns: minmax(180px, 1.3fr) minmax(150px, 0.7fr) auto;
    align-items: end;
}

.wide {
    grid-column: 1 / -1;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 9px 14px;
    color: var(--text);
    background: var(--surface-alt);
    font-weight: 750;
    cursor: pointer;
}

.button-primary {
    color: #fff;
    background: var(--primary);
}

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

.button-secondary,
.button-ghost {
    border-color: var(--line);
    background: #fff;
}

.button-success {
    color: #fff;
    background: var(--success);
}

.button-danger {
    color: #fff;
    background: var(--danger);
}

.alert {
    margin-bottom: 18px;
    border-radius: 8px;
    padding: 12px 14px;
    font-weight: 650;
}

.alert-success {
    border: 1px solid #bbf7d0;
    color: #14532d;
    background: #dcfce7;
}

.alert-error {
    border: 1px solid #fecaca;
    color: #7f1d1d;
    background: #fee2e2;
}

.muted {
    color: var(--muted);
}

.checklist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.checklist-card,
.item-card,
.toolbar-panel,
.add-item-panel,
.empty-state {
    padding: 18px;
}

.progress-line {
    width: 100%;
    height: 9px;
    overflow: hidden;
    border-radius: 999px;
    background: #e2e8f0;
}

.progress-line div {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--primary), var(--success));
}

.progress-text {
    margin: 10px 0 16px;
    color: var(--muted);
    font-weight: 650;
}

.meta-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 0 0 16px;
}

.meta-list div {
    padding: 10px;
    border-radius: 8px;
    background: var(--surface-alt);
}

.meta-list dt {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
}

.meta-list dd {
    margin: 2px 0 0;
    font-weight: 700;
}

.summary-pill {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 9px 14px;
    background: #fff;
    color: var(--muted);
    font-weight: 800;
}

.toolbar-panel,
.add-item-panel,
.filters,
.item-section {
    margin-bottom: 18px;
}

.filters a {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 8px 13px;
    color: var(--muted);
    background: #fff;
    font-weight: 750;
}

.filters a.active {
    border-color: var(--primary);
    color: #fff;
    background: var(--primary);
}

.item-section h2 {
    margin: 24px 0 12px;
    font-size: 1.15rem;
}

.item-list {
    display: grid;
    gap: 12px;
}

.item-card.is-done {
    background: #fbfdfc;
}

.item-card.is-done input[name="title"] {
    color: var(--muted);
    text-decoration: line-through;
}

.item-footer {
    justify-content: space-between;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
}

.item-meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 650;
}

@media (max-width: 760px) {
    .topbar,
    .page-heading {
        align-items: stretch;
        flex-direction: column;
    }

    .topbar-user {
        justify-content: space-between;
    }

    .quick-create,
    .title-form,
    .item-create-form,
    .item-edit-form {
        grid-template-columns: 1fr;
    }

    .card-actions,
    .item-actions {
        width: 100%;
    }

    .card-actions .button,
    .card-actions form,
    .item-actions .button,
    .item-actions form {
        width: 100%;
    }

    .meta-list {
        grid-template-columns: 1fr;
    }
}