:root {
    --bg: linear-gradient(145deg, #f4f8fb 0%, #edf3f8 100%);
    --card-bg: rgba(255, 255, 255, 0.92);
    --text: #112434;
    --muted: #53667a;
    --border: #d5e0ea;
    --accent: #0f766e;
    --accent-strong: #0b5f58;
    --accent-soft: rgba(15, 118, 110, 0.12);
    --danger-bg: #fff1f2;
    --danger-border: #fecdd3;
    --danger-text: #be123c;
    --result-pane-height: 560px;
}

[data-theme="dark"] {
    --bg: linear-gradient(145deg, #0f1824 0%, #0a111a 100%);
    --card-bg: rgba(19, 30, 43, 0.92);
    --text: #e7eef7;
    --muted: #9eb2c8;
    --border: #2a3d51;
    --accent: #22b8ae;
    --accent-strong: #1a978f;
    --accent-soft: rgba(34, 184, 174, 0.16);
    --danger-bg: #3d1b22;
    --danger-border: #69303d;
    --danger-text: #fecdd3;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

.page {
    max-width: 980px;
    margin: 0 auto;
    padding: 28px 16px 40px;
    display: grid;
    gap: 16px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 18px;
    box-shadow: 0 12px 26px -20px rgba(15, 23, 42, 0.45);
    contain: layout style;
}

.header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.top-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

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

h2 {
    margin: 0 0 12px;
    font-size: 1.1rem;
}

h3 {
    margin: 0 0 10px;
    font-size: 0.98rem;
}

p {
    margin: 6px 0 0;
    color: var(--muted);
}

.theme-switch {
    display: flex;
    gap: 8px;
    align-items: center;
}

.theme-btn {
    border: 1px solid var(--border);
    background: transparent;
    color: var(--muted);
    border-radius: 999px;
    padding: 6px 14px;
    cursor: pointer;
}

.theme-btn.active {
    color: #fff;
    background: var(--accent);
    border-color: var(--accent);
}

.form-grid {
    display: grid;
    gap: 12px;
}

.field {
    display: grid;
    gap: 6px;
}

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

input[type="file"],
input[type="text"],
input[type="email"],
input[type="password"],
select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: transparent;
    color: var(--text);
    padding: 10px 12px;
}

.toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
}

.btn-primary {
    justify-self: start;
    border: none;
    border-radius: 999px;
    padding: 10px 16px;
    color: #fff;
    background: var(--accent);
    cursor: pointer;
}

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

.btn-secondary {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 8px 14px;
    color: var(--text);
    background: transparent;
    cursor: pointer;
    text-decoration: none;
}

.btn-danger {
    border: 1px solid #b42318;
    border-radius: 999px;
    padding: 8px 14px;
    color: #fff;
    background: #b42318;
    cursor: pointer;
}

.btn-danger:hover {
    background: #8a1c14;
}

.auth-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.auth-page {
    max-width: 860px;
}

.auth-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.9fr);
    gap: 18px;
    align-items: stretch;
}

.single-auth-shell {
    grid-template-columns: minmax(0, 1fr);
    max-width: 620px;
    margin: 0 auto;
}

.auth-panel,
.auth-aside {
    display: grid;
    gap: 14px;
}

.auth-panel {
    padding: 6px;
}

.auth-form {
    margin-top: 4px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 999px;
    padding: 5px 10px;
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: var(--accent-soft);
}

.auth-submit,
.auth-link-btn {
    justify-self: stretch;
    text-align: center;
}

.auth-aside {
    border-left: 1px solid var(--border);
    padding-left: 18px;
    align-content: start;
}

.auth-aside-block {
    display: grid;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: color-mix(in srgb, var(--card-bg) 92%, transparent);
}

.auth-footer {
    margin-top: 4px;
}

.auth-footer a {
    color: var(--accent);
}

.notice-text {
    color: var(--accent);
}

.error {
    background: var(--danger-bg);
    border-color: var(--danger-border);
    color: var(--danger-text);
}

.meta-grid {
    display: grid;
    gap: 8px;
    margin-bottom: 12px;
    color: var(--muted);
}

.inline-form {
    margin-top: 10px;
}

.status-pill {
    display: inline-block;
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 3px 10px;
    color: var(--muted);
    text-transform: lowercase;
    font-size: 0.84rem;
}

.section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}

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

.history-item {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    background: transparent;
}

.history-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.result-stack {
    display: grid;
    gap: 10px;
}

.result-item {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px;
    background: transparent;
}

.result-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    list-style: none;
}

.result-summary::-webkit-details-marker {
    display: none;
}

.result-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 14px;
    align-items: stretch;
}

.preview-pane,
.json-pane {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.result-card {
    max-width: 980px;
    width: 100%;
    margin: 0 auto;
}

.feedback-wrap {
    margin-top: 14px;
    border-top: 1px solid var(--border);
    padding-top: 14px;
}

.preview-box {
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    background: #fff;
    contain: layout style paint;
    will-change: auto;
}

.preview-box iframe {
    width: 100%;
    min-height: var(--result-pane-height);
    border: 0;
    display: block;
}

.json-pane pre {
    min-height: var(--result-pane-height);
}

.json-edit {
    width: 100%;
    min-height: var(--result-pane-height);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 12px;
    background: #0f172a;
    color: #dbeafe;
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.82rem;
    resize: vertical;
}

pre {
    margin: 0;
    padding: 14px;
    border-radius: 12px;
    overflow: auto;
    background: #0f172a;
    color: #dbeafe;
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.82rem;
    contain: layout style paint;
}

@media (max-width: 640px) {
    .theme-switch {
        width: 100%;
    }

    .theme-btn {
        flex: 1;
    }

    .result-grid {
        grid-template-columns: 1fr;
    }

    .preview-box iframe,
    .json-pane pre,
    .json-edit {
        min-height: 360px;
    }

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

    .auth-aside {
        border-left: 0;
        border-top: 1px solid var(--border);
        padding-left: 0;
        padding-top: 18px;
    }
}