/* =========================================================
       전역 스타일 + CSS 변수
       - :root 수준 변수는 기 테마 값으로 시작
       - prefers-color-scheme과 관하게 색상은 변수로 어
       ========================================================= */
       :root {
        --bg: #ffffff;
        --text: #0f172a;
        --primary: #2563eb;
        --secondary: #64748b;
        --accent: #10b981;

        --radius: 12px;
        --border: #e5e7eb;
        --muted: #6b7280;
        --shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
        --focus: 0 0 0 3px rgba(37, 99, 235, 0.25);
        color-scheme: light dark; /* 시스템 크 대비를 위한 기본 힌트 */
    }
    /* 다크모드 토글 시 :root[data-theme-mode="dark"] 로 시 */
    :root[data-theme-mode="dark"] {
        color-scheme: dark;
        --border: #263043;
        --muted: #9aa3b2;
        --shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
    }

    /* 기본 글/레이아웃 */
    html,
    body {
        margin: 0;
        padding: 0;
        background: var(--bg);
        color: var(--text);
        font-family: system-ui, -apple-system, Segoe UI, Roboto,
            "Apple SD Gothic Neo", "Malgun Gothic", Arial, sans-serif;
        line-height: 1.55;
    }
    * {
        box-sizing: border-box;
    }
    a {
        color: var(--primary);
        text-decoration: none;
    }

    .wrap {
        max-width: 1200px;
        margin: 0 auto;
        padding: 16px;
    }
    header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        margin-bottom: 12px;
    }
    h1 {
        font-size: 1.2rem;
        margin: 0;
    }
    .muted {
        color: var(--muted);
        font-size: 0.92rem;
    }

    .toolbar {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        align-items: center;
    }
    .btn {
        border: 1px solid var(--border);
        background: #ffffff10;
        color: var(--text);
        padding: 10px 14px;
        border-radius: 10px;
        cursor: pointer;
        transition: transform 0.05s ease, background 0.15s ease,
            border-color 0.15s ease;
    }
    .btn:hover {
        background: #00000008;
    }
    .btn:focus-visible {
        outline: none;
        box-shadow: var(--focus);
    }
    .btn.primary {
        background: var(--primary);
        border-color: transparent;
        color: #fff;
    }
    .btn.primary:hover {
        filter: brightness(1.05);
    }

    .switch {
        display: inline-flex;
        gap: 8px;
        align-items: center;
    }
    .switch input {
        width: 44px;
        height: 22px;
    }

    /* 2열 그드: 좌(테마 목록) / 우(프리뷰) */
    .grid {
        display: grid;
        gap: 16px;
        grid-template-columns: 1fr 1.35fr;
    }
    @media (max-width: 980px) {
        .grid {
            grid-template-columns: 1fr;
        }
    }

    .card {
        border: 1px solid var(--border);
        border-radius: var(--radius);
        background: #ffffff12;
        padding: 14px;
        box-shadow: var(--shadow);
        backdrop-filter: saturate(140%) blur(0px);
        transition: background 0.25s ease, color 0.25s ease,
            border-color 0.25s ease, box-shadow 0.25s ease;
    }
    .card h2 {
        margin: 0 0 10px 0;
        font-size: 1.05rem;
    }

    /* 테마 리스트 */
    .themes {
        display: flex;
        flex-direction: column;
        gap: 10px;
        overflow-y: auto;
        max-height: 300px;
    }
    @media(min-width: 1024px) {
        .themes {
            max-height: 840px;
        }
    }
    .theme-item {
        border: 1px solid var(--border);
        border-radius: 12px;
        overflow: hidden;
        transition: border-color 0.2s ease, box-shadow 0.2s ease;
        background: #fff0;
        flex-shrink: 0;
    }
    .theme-head {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 8px;
        padding: 10px 12px;
        background: #ffffff06;
    }
    .theme-name {
        font-weight: 700;
    }
    .swatches {
        display: flex;
        gap: 4px;
    }
    .swatch {
        width: 20px;
        height: 20px;
        border-radius: 6px;
        border: 1px solid #0003;
    }
    .theme-actions {
        display: flex;
        gap: 6px;
    }
    .theme-item[aria-current="true"] {
        border-color: var(--primary);
        box-shadow: 0 0 0 3px
            color-mix(in oklab, var(--primary) 25%, transparent);
    }
    .theme-btn {
        cursor: pointer;
        padding: 8px 10px;
        border-radius: 8px;
        border: 1px solid var(--border);
        background: #ffffff10;
    }
    .theme-btn:hover {
        background: #00000008;
    }
    .theme-btn:focus-visible {
        outline: none;
        box-shadow: var(--focus);
    }

    /* 프리뷰 */
    .preview {
        display: grid;
        gap: 12px;
        grid-template-columns: 1fr;
    }
    .pill {
        display: inline-block;
        padding: 6px 10px;
        border: 1px solid var(--border);
        border-radius: 999px;
        font-size: 0.85rem;
        background: #00000008;
    }
    .row {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .kbtn {
        padding: 10px 14px;
        border-radius: 10px;
        border: 1px solid var(--border);
        background: var(--primary);
        color: #fff;
        cursor: pointer;
        transition: transform 0.05s ease, filter 0.15s ease;
    }
    .kbtn.secondary {
        background: var(--secondary);
    }
    .kbtn.accent {
        background: var(--accent);
    }
    .kbtn.outline {
        background: transparent;
        color: var(--text);
    }
    .kbtn:hover {
        filter: brightness(1.05);
    }
    .kbtn:active {
        transform: translateY(1px);
    }
    .kbtn:focus-visible {
        outline: none;
        box-shadow: var(--focus);
    }

    .preview-card {
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: 12px;
        background: #ffffff14;
    }
    .preview-title {
        margin: 0 0 4px 0;
        font-size: 1.05rem;
    }
    .preview-text {
        margin: 0;
        color: var(--muted);
    }

    .muted-line {
        color: var(--muted);
        font-size: 0.92rem;
    }

    /* 커스텀 테마 폼 */
    .form {
        display: grid;
        gap: 10px;
        grid-template-columns: 1fr 1fr;
    }
    .form .full {
        grid-column: 1 / -1;
    }
    label {
        display: block;
        font-weight: 700;
        margin-bottom: 4px;
    }
    input[type="text"],
    input[type="color"] {
        width: 100%;
        border-radius: 10px;
        border: 1px solid var(--border);
        background: #fff0;
        color: var(--text);
    }
    input[type="text"] {
        padding: 10px 12px;
    }
    input[type="text"]:focus-visible,
    input[type="color"]:focus-visible {
        outline: none;
        box-shadow: var(--focus);
    }

    /* 하단 JSON 박스 */
    .jsonbox {
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: 10px;
        background: #00000006;
        white-space: pre-wrap;
        overflow: auto;
        max-height: 220px;
        font-family: ui-monospace, SFMono-Regular, Menlo, Consolas,
            "Liberation Mono", monospace;
        font-size: 0.9rem;
    }
    .note {
        color: var(--muted);
        font-size: 0.9rem;
    }

    /* 포커스 표시 */
    :focus-visible {
        outline: none;
        box-shadow: var(--focus);
    }

    /* 부드러운 전환 */
    * {
        transition: background-color 0.25s ease, color 0.25s ease,
            border-color 0.25s ease;
    }