* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: #172026;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f6f5;
}

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

button {
    min-height: 38px;
    padding: 0 14px;
    border: 1px solid #1d5f7a;
    border-radius: 6px;
    background: #0c6b8f;
    color: white;
    cursor: pointer;
}

button.secondary {
    border-color: #c4cdd0;
    background: white;
    color: #172026;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 64px;
    padding: 12px 20px;
    color: white;
    background: #20343b;
}

.topbar strong {
    display: block;
    font-size: 19px;
}

.topbar span {
    color: #c8d8de;
    font-size: 13px;
}

.topbar nav {
    display: flex;
    gap: 8px;
}

.shell {
    display: grid;
    grid-template-columns: 330px minmax(360px, 1fr) minmax(420px, 1.2fr);
    min-height: calc(100vh - 64px);
}

.sidebar,
.editor {
    border-right: 1px solid #d6dddd;
    background: white;
}

.sidebar {
    padding: 16px;
    overflow: auto;
}

label {
    display: grid;
    gap: 7px;
    margin-bottom: 12px;
    color: #506166;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid #c9d3d5;
    border-radius: 6px;
    background: white;
    color: #172026;
    padding: 10px 11px;
}

textarea {
    min-height: 120px;
    resize: vertical;
}

.block-tools {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin: 18px 0;
}

.blocks {
    display: grid;
    gap: 8px;
}

.block-item {
    width: 100%;
    border: 1px solid #d6dddd;
    background: #f9fbfb;
    color: #172026;
    text-align: left;
}

.block-item.active {
    border-color: #0c6b8f;
    box-shadow: inset 4px 0 0 #0c6b8f;
}

.editor {
    padding: 18px;
    overflow: auto;
}

.block-editor {
    display: grid;
    gap: 14px;
}

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

.panel {
    padding: 14px;
    border: 1px solid #d6dddd;
    border-radius: 8px;
    background: white;
}

.panel h2,
.panel h3 {
    margin: 0 0 12px;
}

.row-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.preview {
    background: #e9eeee;
}

.preview iframe {
    width: 100%;
    height: 100%;
    border: 0;
    background: white;
}

.toast {
    position: fixed;
    right: 18px;
    bottom: 18px;
    max-width: 360px;
    padding: 12px 14px;
    border-radius: 6px;
    background: #20343b;
    color: white;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity .2s, transform .2s;
}

.toast.visible {
    opacity: 1;
    transform: translateY(0);
}

.login-body {
    display: grid;
    min-height: 100vh;
    place-items: center;
    padding: 24px;
    background: #e9eeee;
}

.login-box {
    width: min(420px, 100%);
    padding: 28px;
    border: 1px solid #d6dddd;
    border-radius: 8px;
    background: white;
    box-shadow: 0 16px 40px rgba(24, 43, 50, .12);
}

.login-box h1 {
    margin: 0 0 8px;
    color: #20343b;
}

.login-box p {
    margin: 0 0 22px;
    color: #506166;
}

.login-error {
    min-height: 22px;
    margin-top: 14px;
    color: #a72d2d;
    font-weight: 700;
}

@media (max-width: 1120px) {
    .shell {
        grid-template-columns: 310px 1fr;
    }

    .preview {
        grid-column: 1 / -1;
        height: 70vh;
    }
}

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

    .shell,
    .field-grid {
        grid-template-columns: 1fr;
    }

    .preview {
        height: 72vh;
    }
}