.terrain-tool-page {
    --terrain-bg: linear-gradient(180deg, #f6f4ec 0%, #ebefe7 48%, #eef2f6 100%);
    --terrain-panel: rgba(255, 255, 255, 0.84);
    --terrain-border: rgba(28, 42, 30, 0.12);
    --terrain-ink: #17211b;
    --terrain-muted: #5a6a60;
    --terrain-accent: #295f4e;
    --terrain-accent-soft: #d7e6dd;
    --terrain-shadow: 0 22px 40px rgba(17, 24, 39, 0.08);
    background: var(--terrain-bg);
}

.terrain-generator-shell {
    display: grid;
    gap: 20px;
}

.terrain-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.9fr);
    gap: 18px;
    padding: 28px;
    border-radius: 24px;
    background:
        radial-gradient(circle at top left, rgba(62, 122, 100, 0.18), transparent 34%),
        radial-gradient(circle at bottom right, rgba(35, 86, 150, 0.16), transparent 32%),
        rgba(255, 255, 255, 0.92);
    border: 1px solid var(--terrain-border);
    box-shadow: var(--terrain-shadow);
}

.terrain-eyebrow {
    margin: 0 0 10px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: #617468;
}

.terrain-hero h1 {
    margin: 0;
    font-size: clamp(30px, 4vw, 48px);
    line-height: 1.02;
    color: var(--terrain-ink);
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
}

.terrain-lead,
.terrain-balance,
.terrain-meta,
.terrain-prompt-details p,
.terrain-status {
    color: var(--terrain-muted);
}

.terrain-lead {
    max-width: 720px;
    margin: 16px 0 14px;
    font-size: 16px;
    line-height: 1.7;
}

.terrain-balance {
    margin: 0;
    font-weight: 600;
}

.terrain-balance a,
.terrain-download-link {
    color: var(--terrain-accent);
    text-decoration: none;
}

.terrain-hero-notes {
    display: grid;
    gap: 12px;
}

.terrain-note-card,
.terrain-panel,
.terrain-variant-card {
    border: 1px solid var(--terrain-border);
    background: var(--terrain-panel);
    box-shadow: var(--terrain-shadow);
    backdrop-filter: blur(18px);
}

.terrain-note-card {
    padding: 16px 18px;
    border-radius: 18px;
}

.terrain-note-label {
    display: block;
    margin-bottom: 6px;
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: #708278;
}

.terrain-panel {
    padding: 22px;
    border-radius: 24px;
}

.terrain-form-grid,
.terrain-tuning-grid,
.terrain-source-grid,
.terrain-variant-grid,
.terrain-variant-preview-grid {
    display: grid;
    gap: 16px;
}

.terrain-form-grid {
    grid-template-columns: minmax(0, 1.8fr) repeat(2, minmax(180px, 0.5fr));
}

.terrain-field,
.terrain-range-field {
    display: grid;
    gap: 8px;
}

.terrain-field span,
.terrain-range-field span {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #607167;
}

.terrain-field-wide {
    grid-column: span 1;
}

.terrain-field textarea,
.terrain-field input,
.terrain-field select {
    width: 100%;
    padding: 14px 16px;
    border-radius: 18px;
    border: 1px solid rgba(31, 53, 45, 0.12);
    background: rgba(248, 250, 249, 0.94);
    color: var(--terrain-ink);
    font: inherit;
    resize: vertical;
}

.terrain-action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
}

.terrain-primary-button,
.terrain-secondary-button,
.terrain-variant-button {
    border-radius: 999px;
    text-transform: none;
    letter-spacing: 0;
    font-weight: 700;
}

.terrain-primary-button {
    background: linear-gradient(135deg, #2f6c59, #224c7d) !important;
}

.terrain-secondary-button,
.terrain-variant-button {
    background: #ffffff;
    color: var(--terrain-ink);
}

.terrain-loading {
    margin-top: 16px;
}

.terrain-status {
    min-height: 22px;
    margin: 12px 0 0;
    font-weight: 600;
}

.terrain-status[data-tone="error"] {
    color: #a63c32;
}

.terrain-status[data-tone="success"] {
    color: #23553c;
}

.terrain-tuning-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.terrain-range-field input[type="range"] {
    width: 100%;
}

.terrain-range-field strong {
    font-size: 14px;
    color: var(--terrain-ink);
}

.terrain-panel-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.terrain-panel-header h2,
.terrain-preview-head h3,
.terrain-variant-card h3 {
    margin: 0;
    color: var(--terrain-ink);
}

.terrain-prompt-details {
    max-width: 520px;
}

.terrain-prompt-details summary {
    cursor: pointer;
    font-weight: 700;
    color: var(--terrain-accent);
}

.terrain-source-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.terrain-preview-card,
.terrain-variant-card {
    border-radius: 20px;
    overflow: hidden;
}

.terrain-preview-card {
    border: 1px solid rgba(28, 42, 30, 0.1);
    background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(239, 243, 241, 0.94));
}

.terrain-preview-head,
.terrain-variant-head,
.terrain-variant-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 14px 16px;
}

.terrain-preview-frame {
    aspect-ratio: 1;
    background:
        linear-gradient(45deg, rgba(27, 35, 29, 0.03) 25%, transparent 25%, transparent 75%, rgba(27, 35, 29, 0.03) 75%),
        linear-gradient(45deg, rgba(27, 35, 29, 0.03) 25%, transparent 25%, transparent 75%, rgba(27, 35, 29, 0.03) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    border-top: 1px solid rgba(28, 42, 30, 0.08);
}

.terrain-preview-frame img,
.terrain-variant-pane img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
}

.terrain-variants-panel {
    padding-bottom: 26px;
}

.terrain-variant-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.terrain-variant-card {
    display: grid;
    grid-template-rows: auto auto auto;
}

.terrain-variant-head {
    align-items: flex-start;
}

.terrain-variant-head p,
.terrain-variant-footer p {
    margin: 6px 0 0;
    color: var(--terrain-muted);
}

.terrain-variant-preview-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding: 0 16px 16px;
}

.terrain-variant-pane {
    display: grid;
    gap: 8px;
}

.terrain-variant-pane span {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #718178;
}

.terrain-variant-frame {
    min-height: 208px;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(27, 35, 29, 0.08);
    background: linear-gradient(180deg, #eef2ec, #dfe7e0);
}

.terrain-variant-frame canvas,
.terrain-variant-frame img {
    width: 100%;
    height: 100%;
    display: block;
}

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

.terrain-empty-state {
    padding: 28px;
    border-radius: 20px;
    border: 1px dashed rgba(41, 95, 78, 0.28);
    background: rgba(233, 239, 234, 0.7);
    color: var(--terrain-muted);
}

@media (max-width: 1100px) {
    .terrain-hero,
    .terrain-form-grid,
    .terrain-tuning-grid,
    .terrain-source-grid,
    .terrain-variant-grid,
    .terrain-variant-preview-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .terrain-hero,
    .terrain-panel {
        padding: 18px;
        border-radius: 18px;
    }

    .terrain-variant-frame {
        min-height: 180px;
    }
}