:root {
    color-scheme: dark;
    --font-sans: "Plus Jakarta Sans", Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    --bg-primary: #08090b;
    --bg-card: #0e1115;
    --bg-header: #0a0c0e;
    --input-bg: #11141a;
    --border-color: #1a1e24;
    --border-hover: #2d333f;
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --accent-muted: rgba(245, 158, 11, 0.08);
    --success: #10b981;
    --success-muted: rgba(16, 185, 129, 0.1);
    --danger: #ef4444;
    --danger-muted: rgba(239, 68, 68, 0.1);
    --warning: #f59e0b;
    --shadow-main: 0 18px 55px rgba(0, 0, 0, 0.36);
    --shadow-focus: 0 0 0 3px rgba(245, 158, 11, 0.2);
    --transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    color-scheme: light;
    --bg-primary: #faf9f6;
    --bg-card: #ffffff;
    --bg-header: #f3f1eb;
    --input-bg: #fdfdfc;
    --border-color: #e2dfd8;
    --border-hover: #cbc7bd;
    --text-primary: #1c1917;
    --text-secondary: #57534e;
    --text-muted: #878680;
    --accent: #d97706;
    --accent-hover: #b45309;
    --accent-muted: rgba(217, 119, 6, 0.07);
    --success: #059669;
    --success-muted: rgba(5, 150, 105, 0.08);
    --danger: #dc2626;
    --danger-muted: rgba(220, 38, 38, 0.08);
    --shadow-main: 0 18px 44px rgba(27, 25, 23, 0.08);
    --shadow-focus: 0 0 0 3px rgba(217, 119, 6, 0.16);
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}

button,
input,
select {
    font: inherit;
}

button {
    color: inherit;
}

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

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    border-radius: 4px;
    background: var(--border-color);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

.app-shell {
    width: min(1380px, calc(100% - 32px));
    min-height: calc(100vh - 80px);
    margin: 0 auto;
    padding: 22px 0 28px;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 0 0 18px;
    margin-bottom: 18px;
    border-bottom: 1px solid var(--border-color);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}

.logo-mark {
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-card);
    box-shadow: var(--shadow-main);
    object-fit: cover;
}

.eyebrow {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

h1 {
    margin: 1px 0 0;
    font-size: 1.16rem;
    font-weight: 800;
    letter-spacing: 0;
}

.tagline {
    margin: 2px 0 0;
    color: var(--text-secondary);
    font-size: 0.86rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
}

.github-link,
.utility-button,
.language-switcher {
    height: 38px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    transition: var(--transition);
}

.github-link,
.utility-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 13px;
    cursor: pointer;
    font-size: 0.84rem;
    font-weight: 700;
}

.github-link:hover,
.utility-button:hover {
    border-color: var(--accent);
    background: var(--accent-muted);
    color: var(--accent);
}

.language-switcher {
    display: grid;
    grid-template-columns: repeat(2, 38px);
    padding: 3px;
}

.language-button {
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 900;
}

.language-button.active {
    background: var(--accent);
    color: #120a00;
}

.workspace {
    display: grid;
    grid-template-columns: minmax(310px, 390px) minmax(0, 1fr);
    gap: 16px;
}

.control-panel,
.preview-panel {
    min-width: 0;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-card);
    box-shadow: var(--shadow-main);
    transition: var(--transition);
}

.control-panel:hover,
.preview-panel:hover {
    border-color: var(--border-hover);
}

.control-panel {
    padding: 18px;
}

.preview-panel {
    padding: 18px;
}

.panel-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--border-color);
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.panel-kicker {
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text-muted);
    font-size: 0.68rem;
    letter-spacing: 0.04em;
}

.tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    margin-bottom: 18px;
    padding: 4px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-header);
}

.tab {
    min-height: 38px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 800;
    transition: var(--transition);
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    background: var(--accent-muted);
    color: var(--accent);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.input-group {
    margin-bottom: 14px;
}

.input-group label,
.check-row {
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 700;
}

.input-group label {
    display: block;
    margin-bottom: 7px;
}

.input-group input,
.input-group select {
    width: 100%;
    min-height: 39px;
    padding: 8px 11px;
    border: 1px solid var(--border-color);
    border-radius: 7px;
    background: var(--input-bg);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition);
}

.input-group input::placeholder {
    color: var(--text-muted);
}

.input-group input:focus,
.input-group select:focus {
    border-color: var(--accent);
    box-shadow: var(--shadow-focus);
}

.input-group small {
    display: block;
    margin-top: 7px;
    color: var(--text-muted);
    font-size: 0.76rem;
}

.check-row {
    display: flex;
    align-items: center;
    gap: 9px;
    min-height: 34px;
    margin: 5px 0 11px;
    cursor: pointer;
}

.check-row input {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
}

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

.actions {
    display: grid;
    gap: 9px;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px dashed var(--border-color);
}

.button {
    min-height: 42px;
    border: 1px solid var(--accent);
    border-radius: 8px;
    background: var(--accent);
    color: #120a00;
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 800;
    transition: var(--transition);
}

.button:hover:not(:disabled) {
    border-color: var(--accent-hover);
    background: var(--accent-hover);
    box-shadow: 0 0 18px rgba(245, 158, 11, 0.2);
}

.button.secondary {
    border-color: var(--border-color);
    background: transparent;
    color: var(--text-primary);
}

.button.secondary:hover:not(:disabled) {
    border-color: var(--border-hover);
    background: var(--input-bg);
    color: var(--text-primary);
    box-shadow: none;
}

.button:disabled {
    cursor: not-allowed;
    opacity: 0.44;
}

.drop-zone {
    display: flex;
    min-height: 190px;
    align-items: center;
    justify-content: center;
    padding: 26px;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    background: var(--input-bg);
    cursor: pointer;
    text-align: center;
    transition: var(--transition);
}

.drop-zone:hover,
.drop-zone.dragging {
    border-color: var(--accent);
    background: var(--accent-muted);
    box-shadow: var(--shadow-focus);
}

.drop-title {
    display: block;
    color: var(--text-primary);
    font-size: 1.04rem;
    font-weight: 800;
}

.drop-copy {
    display: block;
    max-width: 360px;
    margin-top: 4px;
    color: var(--text-secondary);
    font-size: 0.84rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: 14px 0;
}

.stat {
    min-height: 72px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--input-bg);
}

.stat span {
    display: block;
    color: var(--text-secondary);
    font-size: 0.76rem;
    font-weight: 700;
}

.stat strong {
    display: block;
    margin-top: 6px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1.35rem;
}

.progress-bar {
    display: none;
    height: 7px;
    margin: 12px 0;
    overflow: hidden;
    border-radius: 999px;
    background: var(--border-color);
}

.progress-bar-fill {
    width: 0%;
    height: 100%;
    border-radius: inherit;
    background: var(--accent);
    transition: width 0.22s ease;
}

.status-message {
    min-height: 22px;
    margin: 9px 0;
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 700;
}

.status-message.success {
    color: var(--success);
}

.status-message.warning {
    color: var(--warning);
}

.status-message.error {
    color: var(--danger);
}

.file-list {
    display: grid;
    gap: 7px;
    max-height: 440px;
    overflow: auto;
    padding-right: 4px;
}

.empty-state,
.file-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--input-bg);
}

.empty-state {
    padding: 22px;
    color: var(--text-muted);
    text-align: center;
}

.file-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 26px minmax(0, 1fr);
    align-items: center;
    gap: 8px;
    padding: 9px 11px;
    transition: var(--transition);
}

.file-item:hover {
    border-color: var(--border-hover);
}

.file-item.has-conflict {
    border-color: rgba(239, 68, 68, 0.36);
    background: var(--danger-muted);
}

.file-name {
    overflow: hidden;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.new-name {
    color: var(--text-primary);
    font-weight: 700;
}

.file-arrow {
    color: var(--accent);
    font-weight: 900;
    text-align: center;
}

.app-footer {
    width: min(1380px, calc(100% - 32px));
    margin: -8px auto 24px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.78rem;
    text-align: center;
}

.app-footer a {
    color: var(--text-secondary);
    font-weight: 800;
    transition: var(--transition);
}

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

@media (max-width: 900px) {
    .app-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .header-actions {
        width: 100%;
        flex-wrap: wrap;
    }

    .github-link,
    .utility-button {
        flex: 1 1 auto;
    }

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

@media (max-width: 560px) {
    .app-shell,
    .app-footer {
        width: min(100% - 20px, 1380px);
    }

    .header-logo {
        align-items: flex-start;
    }

    .logo-mark {
        display: none;
    }

    .control-panel,
    .preview-panel {
        padding: 12px;
    }

    .tabs,
    .stats-grid,
    .file-item,
    .split-fields {
        grid-template-columns: 1fr;
    }

    .language-switcher {
        flex: 1 1 100%;
        grid-template-columns: repeat(2, 1fr);
    }

    .file-arrow {
        display: none;
    }
}