* {
    box-sizing: border-box;
}

:root {
    --bg: #f4f7fb;
    --panel: #ffffff;
    --text: #16202b;
    --muted: #5b6b7b;
    --line: #d7e0ea;
    --primary: #1f5fae;
    --primary-strong: #174a87;
    --danger: #b42318;
    --success: #0b7a38;
    --warn: #a15c00;
    --shadow: 0 10px 26px rgba(22, 32, 43, 0.08);
    --radius: 18px;
}

body {
    margin: 0;
    font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
    background: var(--bg);
    color: var(--text);
}

a {
    color: inherit;
    text-decoration: none;
}

h1, h2, h3, p {
    margin-top: 0;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 10;
}

.topbar-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.page-shell {
    padding: 24px;
}

.public-shell,
.auth-layout {
    max-width: 980px;
    margin: 0 auto;
}

.admin-shell {
    display: grid;
    grid-template-columns: 0.85fr 1.25fr 1.1fr;
    gap: 20px;
    align-items: start;
}

.card {
    background: var(--panel);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 22px;
    border: 1px solid rgba(215, 224, 234, 0.8);
}

.stack-form,
.stack-list,
.form-host,
.field-builder-list {
    display: grid;
    gap: 14px;
}

label,
.block {
    display: grid;
    gap: 6px;
}

input,
textarea,
select,
button {
    font: inherit;
}

input,
textarea,
select {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--text);
}

textarea {
    resize: vertical;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    padding: 10px 16px;
    border: 0;
    border-radius: 12px;
    background: #eaf0f7;
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
}

.btn:hover {
    filter: brightness(0.98);
}

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

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

.btn.danger {
    background: #fbe7e5;
    color: var(--danger);
}

.btn-small {
    min-height: 34px;
    padding: 6px 12px;
    font-size: 0.92rem;
}

.alert {
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #f8fbff;
    color: var(--text);
    white-space: pre-line;
}

.alert.success {
    background: #edf9f1;
    color: var(--success);
    border-color: #b8e2c4;
}

.alert.error {
    background: #fff1f0;
    color: var(--danger);
    border-color: #f0c1bc;
}

.alert.info {
    background: #eef5fd;
    color: var(--primary);
    border-color: #bed4ef;
}

.hidden {
    display: none !important;
}

.muted,
.small-note,
.small-inline {
    color: var(--muted);
}

.small-note,
.small-inline {
    font-size: 0.92rem;
}

.auth-layout {
    min-height: calc(100vh - 88px);
    display: grid;
    place-items: center;
    padding: 24px;
}

.auth-card {
    width: min(100%, 460px);
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.tab-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.tab-button {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 999px;
    padding: 10px 16px;
    cursor: pointer;
    color: var(--text);
}

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

.form-block,
.field-card,
.list-item,
.history-item {
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
    background: #fcfdff;
}

.form-title-row,
.section-title-row,
.field-card-header,
.list-item-header,
.inline-actions,
.actions-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.switch-card {
    display: flex;
    gap: 10px;
    align-items: center;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fcfdff;
}

.switch-card input {
    width: auto;
    margin: 0;
}

.form-switch-grid {
    align-items: stretch;
}

.inline-flags {
    display: grid;
    gap: 10px;
}

.meta-line,
.preview-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.pill {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    background: #edf3fb;
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
}

.preview-list {
    margin-top: 10px;
}

.preview-item {
    width: 100%;
    color: var(--muted);
    font-size: 0.92rem;
}

.history-panel {
    margin-top: 18px;
    display: grid;
    gap: 12px;
}

.empty-state {
    padding: 18px;
    border: 1px dashed var(--line);
    border-radius: 14px;
    color: var(--muted);
    background: #fafcff;
}

@media (max-width: 1180px) {
    .admin-shell {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .topbar,
    .section-title-row,
    .field-card-header,
    .list-item-header,
    .form-title-row,
    .inline-actions,
    .actions-row {
        align-items: stretch;
        flex-direction: column;
    }

    .two-col {
        grid-template-columns: 1fr;
    }

    .page-shell,
    .topbar,
    .auth-layout {
        padding: 16px;
    }
}

.list-item.selected {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(31, 95, 174, 0.08);
}

button:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}