@layer base, layout, editor, viewer, print;

    @layer base {
      :root {
        color-scheme: dark;
        --bg: #090d16;
        --panel: rgba(21, 29, 46, 0.75);
        --panel-sub: rgba(15, 22, 36, 0.6);
        --input-bg: rgba(26, 37, 58, 0.8);
        --select-option-bg: #151d2e;
        --select-option-text: #f1f5f9;
        --text: #f1f5f9;
        --muted: #8b9bb4;
        --line: rgba(255, 255, 255, 0.08);
        --line-accent: #38bdf8;
        --accent: #38bdf8;
        --accent-dark: #0284c7;
        --accent-soft: rgba(56, 189, 248, 0.12);
        --accent-glow: 0 0 18px rgba(56, 189, 248, 0.25);
        --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
        --badge-bg: rgba(56, 189, 248, 0.12);
        --badge-text: #38bdf8;
        --shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5), 0 0 1px rgba(255, 255, 255, 0.1);
        --title-gradient: linear-gradient(135deg, #ffffff 30%, #38bdf8 100%);
        --preview-bg: #121826;
        --preview-grid: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px);
        --bg-image:
          radial-gradient(circle at 50% -10%, rgba(56, 189, 248, 0.12) 0%, transparent 50%),
          radial-gradient(circle at 90% 100%, rgba(99, 102, 241, 0.08) 0%, transparent 40%);
        --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2338bdf8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
        --paper-w: 210mm;
        --paper-h: 297mm;
        --doc-font-size: 10.5pt;
        --doc-font-family: "Shippori Mincho", "Yu Mincho", "游明朝", "YuMincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
        --ui-font-family: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;
        --page-padding-v: 18mm;
        --page-padding-h: 14mm;
      }

      [data-theme="standard"] {
        color-scheme: light;
        --bg: #f8fafc;
        --panel: rgba(255, 255, 255, 0.85);
        --panel-sub: rgba(248, 250, 252, 0.75);
        --input-bg: #ffffff;
        --select-option-bg: #ffffff;
        --select-option-text: #0f172a;
        --text: #0f172a;
        --muted: #64748b;
        --line: rgba(14, 165, 233, 0.15);
        --line-accent: #0284c7;
        --accent: #0284c7;
        --accent-dark: #0369a1;
        --accent-soft: rgba(2, 132, 199, 0.08);
        --accent-glow: 0 0 16px rgba(2, 132, 199, 0.18);
        --accent-gradient: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);
        --badge-bg: rgba(2, 132, 199, 0.1);
        --badge-text: #0284c7;
        --shadow: 0 20px 35px -10px rgba(15, 23, 42, 0.07), 0 0 1px rgba(15, 23, 42, 0.08);
        --title-gradient: linear-gradient(135deg, #0f172a 20%, #0284c7 100%);
        --preview-bg: #e2e8f0;
        --preview-grid: radial-gradient(rgba(14, 165, 233, 0.18) 1px, transparent 1px);
        --bg-image:
          radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.06) 0%, transparent 60%),
          linear-gradient(to bottom, rgba(15, 23, 42, 0.01) 1px, transparent 1px);
        --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%230284c7' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
      }

      [data-theme="sepia"] {
        color-scheme: light;
        --bg: #f4efe6;
        --panel: rgba(253, 251, 247, 0.92);
        --panel-sub: rgba(244, 239, 230, 0.7);
        --input-bg: #ffffff;
        --select-option-bg: #fdfbf7;
        --select-option-text: #2c221e;
        --text: #2c221e;
        --muted: #8c7a6b;
        --line: rgba(180, 120, 60, 0.18);
        --line-accent: #c25e00;
        --accent: #c25e00;
        --accent-dark: #964700;
        --accent-soft: rgba(194, 94, 0, 0.09);
        --accent-glow: 0 0 16px rgba(194, 94, 0, 0.18);
        --accent-gradient: linear-gradient(135deg, #d97706 0%, #9a3412 100%);
        --badge-bg: rgba(194, 94, 0, 0.1);
        --badge-text: #c25e00;
        --shadow: 0 20px 35px -10px rgba(44, 34, 30, 0.08), 0 0 1px rgba(44, 34, 30, 0.08);
        --title-gradient: linear-gradient(135deg, #2c221e 20%, #b45309 100%);
        --preview-bg: #dcd3c3;
        --preview-grid: radial-gradient(rgba(180, 120, 60, 0.22) 1px, transparent 1px);
        --bg-image:
          radial-gradient(circle at 50% 0%, rgba(217, 119, 6, 0.08) 0%, transparent 60%),
          linear-gradient(to bottom, rgba(44, 34, 30, 0.02) 1px, transparent 1px);
        --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23c25e00' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
      }

      * {
        box-sizing: border-box;
      }

      html,
      body {
        height: 100vh;
        overflow: hidden;
      }

      html {
        font-family: var(--ui-font-family);
        background: var(--bg);
        background-image: var(--bg-image);
        background-attachment: fixed;
        color: var(--text);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        transition: background-color 0.3s ease, color 0.3s ease;
      }

      body {
        margin: 0;
      }

      button,
      input,
      textarea,
      select {
        font-family: var(--ui-font-family);
        font-size: 0.9rem;
      }

      button {
        cursor: pointer;
        border: none;
        outline: none;
      }

      select {
        appearance: none;
        -webkit-appearance: none;
        background-image: var(--select-arrow);
        background-repeat: no-repeat;
        background-position: right 10px center;
        background-size: 14px;
        padding-right: 30px !important;
      }

      select option {
        background-color: var(--select-option-bg) !important;
        color: var(--select-option-text) !important;
      }

      ::placeholder {
        color: var(--muted);
        opacity: 0.55;
      }

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

      ::-webkit-scrollbar-track {
        background: transparent;
      }

      ::-webkit-scrollbar-thumb {
        background: rgba(140, 140, 140, 0.25);
        border-radius: 99px;
        border: 2px solid transparent;
        background-clip: padding-box;
      }

      ::-webkit-scrollbar-thumb:hover {
        background: var(--accent);
        border: 2px solid transparent;
        background-clip: padding-box;
      }
    }

    @layer layout {
      .app {
        width: min(1520px, calc(100% - 48px));
        height: 100vh;
        margin: 0 auto;
        padding: 16px 0;
        display: flex;
        flex-direction: column;
        box-sizing: border-box;
      }

      .hero {
        margin-bottom: 16px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 16px;
        padding: 12px 24px;
        background: var(--panel);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--line);
        border-radius: 16px;
        box-shadow: var(--shadow);
        position: relative;
        overflow: hidden;
        transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        flex-shrink: 0;
      }

      .hero::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 4px;
        height: 100%;
        background: var(--accent-gradient);
        box-shadow: var(--accent-glow);
      }

      .hero-title-group {
        display: flex;
        align-items: center;
        gap: 14px;
      }

      .hero h1 {
        margin: 0;
        font-size: 1.65rem;
        font-weight: 800;
        letter-spacing: 0.06em;
        background: var(--title-gradient);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        font-family: "Shippori Mincho", "游明朝", serif;
      }

      .version-badge {
        font-size: 0.68rem;
        padding: 3px 10px;
        border-radius: 20px;
        background: var(--badge-bg);
        color: var(--badge-text);
        border: 1px solid var(--line);
        font-weight: 700;
        letter-spacing: 0.08em;
        text-transform: uppercase;
      }

      .hero-actions {
        display: flex;
        gap: 12px;
        align-items: center;
      }

      .panel {
        background: var(--panel);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--line);
        border-radius: 16px;
        box-shadow: var(--shadow);
        transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      }

      .primary-button,
      .secondary-button {
        min-height: 40px;
        border: 0;
        border-radius: 10px;
        padding: 0 20px;
        font-weight: 700;
        font-size: 0.88rem;
        letter-spacing: 0.03em;
        transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        user-select: none;
      }

      .primary-button {
        background: var(--accent-gradient);
        color: #ffffff;
        box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
      }

      .primary-button:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 22px rgba(0, 0, 0, 0.25), var(--accent-glow);
        filter: brightness(1.08);
      }

      .primary-button:active {
        transform: translateY(0) scale(0.98);
      }

      .secondary-button {
        background: var(--panel-sub);
        color: var(--text);
        border: 1px solid var(--line);
      }

      .secondary-button:hover {
        background: var(--accent-soft);
        border-color: var(--accent);
        color: var(--accent);
        box-shadow: var(--accent-glow);
        transform: translateY(-1px);
      }

      .secondary-button:active {
        transform: translateY(0);
      }
    }

    @layer editor {
      .editor-grid {
        display: grid;
        grid-template-columns: 450px 1fr;
        gap: 20px;
        align-items: stretch;
        flex: 1;
        min-height: 0;
      }

      .editor-panel {
        padding: 16px;
        display: flex;
        flex-direction: column;
        height: 100%;
        min-height: 0;
        overflow: hidden;
      }

      .panel-tabs-bar {
        display: flex;
        gap: 8px;
        margin-bottom: 14px;
        background: var(--panel-sub);
        padding: 4px;
        border-radius: 12px;
        border: 1px solid var(--line);
        flex-shrink: 0;
      }

      .tab-radio {
        display: none;
      }

      .panel-tab-btn {
        flex: 1;
        height: 36px;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 6px;
        font-weight: 700;
        font-size: 0.85rem;
        color: var(--muted);
        border-radius: 8px;
        cursor: pointer;
        transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        user-select: none;
      }

      .panel-tab-btn:hover {
        color: var(--text);
        background: rgba(255, 255, 255, 0.05);
      }

      #left-tab-text:checked~.panel-tabs-bar label[for="left-tab-text"],
      #left-tab-settings:checked~.panel-tabs-bar label[for="left-tab-settings"] {
        background: var(--accent-gradient);
        color: #ffffff;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15), var(--accent-glow);
      }

      #left-tab-text:checked~.editor-text-card {
        display: flex;
      }

      #left-tab-text:checked~.editor-settings-card {
        display: none;
      }

      #left-tab-settings:checked~.editor-text-card {
        display: none;
      }

      #left-tab-settings:checked~.editor-settings-card {
        display: block;
      }

      .editor-settings-card {
        flex: 1;
        min-height: 0;
        overflow-y: auto;
        padding-right: 4px;
      }

      .editor-text-card {
        flex: 1;
        min-height: 0;
        display: flex;
        flex-direction: column;
      }

      .setting-group {
        border: 1px solid var(--line);
        border-radius: 12px;
        margin-bottom: 10px;
        background: var(--panel-sub);
        overflow: hidden;
        transition: all 0.25s ease;
        flex-shrink: 0;
      }

      .setting-group:hover {
        border-color: rgba(255, 255, 255, 0.18);
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
      }

      .setting-group summary {
        padding: 10px 14px;
        font-weight: 700;
        font-size: 0.85rem;
        cursor: pointer;
        user-select: none;
        color: var(--text);
        display: flex;
        align-items: center;
        justify-content: space-between;
        outline: none;
        transition: background 0.2s ease, color 0.2s ease;
      }

      .setting-group summary:hover {
        background: var(--accent-soft);
        color: var(--accent);
      }

      .setting-group summary::-webkit-details-marker,
      .setting-group summary::marker {
        display: none;
        content: "";
      }

      .setting-group summary::after {
        content: "";
        width: 8px;
        height: 8px;
        border-right: 2px solid var(--accent);
        border-bottom: 2px solid var(--accent);
        transform: rotate(-45deg);
        transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        margin-right: 4px;
      }

      .setting-group[open] summary::after {
        transform: rotate(45deg);
      }

      .setting-group[open] summary {
        border-bottom: 1px solid var(--line);
        background: var(--accent-soft);
      }

      .setting-content {
        padding: 14px;
      }

      .form-row {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
        margin-bottom: 10px;
      }

      .form-row.two-cols {
        grid-template-columns: repeat(2, 1fr);
      }

      .form-col {
        min-width: 0;
        display: flex;
        flex-direction: column;
        justify-content: flex-end;
      }

      .field-label {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 4px;
        margin-bottom: 6px;
        font-weight: 700;
        font-size: 0.78rem;
        min-height: 20px;
        flex-shrink: 0;
        white-space: nowrap;
        letter-spacing: 0.02em;
        color: var(--text);
        opacity: 0.9;
      }

      .field-label small {
        color: var(--muted);
        font-weight: 500;
      }

      .title-input,
      .select-input {
        width: 100%;
        height: 38px;
        padding: 0 12px;
        font-size: 0.86rem;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: var(--input-bg);
        color: var(--text);
        outline: none;
        transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        box-sizing: border-box;
        font-weight: 600;
        text-overflow: ellipsis;
        white-space: nowrap;
      }

      .text-input {
        width: 100%;
        flex: 1;
        min-height: 0;
        padding: 16px;
        border: 1px solid var(--line);
        border-radius: 12px;
        background: var(--input-bg);
        color: var(--text);
        outline: none;
        transition: all 0.2s ease;
        resize: none;
        line-height: 1.85;
        box-sizing: border-box;
        font-weight: 500;
        font-family: var(--ui-font-family);
        box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.04);
      }

      .title-input:hover,
      .select-input:hover,
      .text-input:hover {
        border-color: rgba(255, 255, 255, 0.2);
      }

      .title-input:focus,
      .text-input:focus,
      .select-input:focus {
        border-color: var(--accent);
        box-shadow: 0 0 0 3px var(--accent-soft), var(--accent-glow);
      }

      .controls-main {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 12px;
        flex-shrink: 0;
      }

      .app-footer {
        margin-top: 16px;
        padding: 12px 16px;
        font-size: 0.75rem;
        color: var(--muted);
        text-align: center;
        border-top: 1px dashed var(--line);
        letter-spacing: 0.04em;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 6px;
        flex-shrink: 0;
        opacity: 0.8;
        transition: opacity 0.2s ease;
      }

      .app-footer:hover {
        opacity: 1;
      }

      .app-footer a {
        color: var(--accent);
        text-decoration: none;
        font-weight: 600;
        transition: filter 0.2s ease;
      }

      .app-footer a:hover {
        text-decoration: underline;
        filter: brightness(1.2);
      }

    }

    @layer viewer {
      .preview-container-wrapper {
        position: relative;
        width: 100%;
        min-width: 0;
        height: 100%;
        min-height: 0;
        display: flex;
        flex-direction: column;
      }

      .loading-indicator {
        position: absolute;
        top: 20px;
        left: 20px;
        z-index: 100;
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 10px 20px;
        background: var(--panel);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        color: var(--accent);
        border: 1px solid var(--line);
        border-radius: 30px;
        font-size: 0.8rem;
        font-weight: 700;
        letter-spacing: 0.05em;
        box-shadow: var(--shadow);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        transform: translateY(-8px);
      }

      .loading-indicator.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
      }

      .loading-spinner {
        width: 14px;
        height: 14px;
        border: 2px solid var(--line);
        border-top-color: var(--accent);
        border-radius: 50%;
        animation: loading-spin 0.7s linear infinite;
      }

      @keyframes loading-spin {
        to {
          transform: rotate(360deg);
        }
      }

      .page-nav-bar {
        position: absolute;
        top: 20px;
        right: 20px;
        z-index: 90;
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 6px 12px;
        background: var(--panel);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border: 1px solid var(--line);
        border-radius: 30px;
        box-shadow: var(--shadow);
        direction: ltr;
      }

      .page-nav-btn {
        height: 32px;
        padding: 0 14px;
        border-radius: 20px;
        border: 1px solid var(--line);
        background: var(--panel-sub);
        color: var(--text);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.78rem;
        font-weight: 700;
        cursor: pointer;
        transition: all 0.2s ease;
        gap: 4px;
      }

      .page-nav-btn:hover:not(:disabled) {
        background: var(--accent-soft);
        border-color: var(--accent);
        color: var(--accent);
        box-shadow: var(--accent-glow);
      }

      .page-nav-btn:disabled {
        opacity: 0.3;
        cursor: not-allowed;
      }

      .page-nav-info {
        font-size: 0.82rem;
        font-weight: 700;
        color: var(--accent);
        padding: 0 8px;
        min-width: 90px;
        text-align: center;
        font-variant-numeric: tabular-nums;
        letter-spacing: 0.05em;
      }

      .mobile-tab-bar {
        display: none;
        gap: 8px;
        margin-bottom: 12px;
        background: var(--panel);
        backdrop-filter: blur(16px);
        padding: 6px;
        border-radius: 12px;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
        flex-shrink: 0;
      }

      .mobile-tab-btn {
        flex: 1;
        height: 40px;
        border: 0;
        border-radius: 8px;
        background: transparent;
        color: var(--text);
        font-weight: 700;
        font-size: 0.85rem;
        cursor: pointer;
        transition: all 0.2s ease;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 6px;
      }

      .mobile-tab-btn.active {
        background: var(--accent-gradient);
        color: #ffffff;
        box-shadow: var(--accent-glow);
      }

      .preview-viewport {
        background-color: var(--preview-bg);
        background-image: var(--preview-grid);
        background-size: 24px 24px;
        border-radius: 16px;
        padding: 24px;
        flex: 1;
        min-height: 0;
        max-height: none;
        overflow-x: auto;
        overflow-y: hidden;
        border: 1px solid var(--line);
        position: relative;
        box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.2), var(--shadow);
        transition: background-color 0.3s ease;
        --preview-scale: 1;

        container-type: size;
        display: flex;
        align-items: center;
        justify-content: flex-start;
      }

      [data-writing-mode="vertical"] .preview-viewport {
        direction: rtl;
      }

      [data-writing-mode="horizontal"] .preview-viewport {
        direction: ltr;
      }

      .pages-container {
        --v-scale: calc((100cqh - 48px) / var(--paper-h));
        --effective-scale: min(var(--preview-scale, 1), var(--v-scale));
        position: relative;
        height: calc(var(--paper-h) * var(--effective-scale));
        padding-bottom: 0;
        direction: ltr;
        transition: height 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      }

      #measurerContainer .paper-page {
        transform: none !important;
      }

      .paper-page {
        position: absolute;
        top: 0;
        width: var(--paper-w);
        height: var(--paper-h);
        min-width: var(--paper-w);
        min-height: var(--paper-h);
        background: #ffffff;
        color: #111827;
        padding: var(--page-padding-v) var(--page-padding-h);
        box-shadow:
          0 20px 45px rgba(0, 0, 0, 0.25),
          0 2px 6px rgba(0, 0, 0, 0.1),
          0 0 0 1px rgba(0, 0, 0, 0.05);
        border-radius: 3px;
        box-sizing: border-box;
        overflow: hidden;
        transform: scale(var(--effective-scale));
        transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s ease, color 0.3s ease;
      }

      [data-writing-mode="vertical"] .paper-page {
        transform-origin: top right;
      }

      [data-writing-mode="horizontal"] .paper-page {
        transform-origin: top left;
      }

      .page-header-tag {
        position: absolute;
        top: 5mm;
        right: var(--page-padding-h);
        font-family: var(--doc-font-family);
        font-size: 0.65rem;
        color: #64748b;
        letter-spacing: 0.12em;
        opacity: 0.85;
        font-weight: 500;
      }

      .page-number-tag {
        position: absolute;
        bottom: 5mm;
        left: 50%;
        transform: translateX(-50%);
        font-family: var(--doc-font-family);
        font-size: 0.68rem;
        color: #64748b;
        letter-spacing: 0.1em;
        font-weight: 500;
      }

      .md-body {
        line-height: 2.0;
        font-family: var(--doc-font-family);
        font-size: var(--doc-font-size);
        width: 100%;
        box-sizing: border-box;
        line-break: strict;
        -webkit-line-break: strict;
        word-break: normal;
        overflow-wrap: anywhere;
        hanging-punctuation: allow-end;
        overflow: hidden;
      }

      [data-writing-mode="vertical"] .md-body {
        writing-mode: vertical-rl;
        -webkit-writing-mode: vertical-rl;
        text-orientation: mixed;
        height: 100%;
      }

      [data-writing-mode="horizontal"] .md-body {
        writing-mode: horizontal-tb;
        -webkit-writing-mode: horizontal-tb;
        width: 100%;
        height: 100%;
      }

      .nobreak {
        display: inline;
        white-space: nowrap;
        text-indent: 0;
      }

      .columns-wrapper {
        display: flex;
        height: 100%;
        width: 100%;
        justify-content: space-between;
      }

      [data-writing-mode="vertical"] .columns-wrapper {
        flex-direction: column;
      }

      [data-writing-mode="vertical"] .paper-page.has-columns .md-body {
        height: calc(50% - 5mm);
      }

      [data-writing-mode="vertical"] .column-divider {
        border-top: 1px solid #cbd5e1;
        width: 100%;
        margin: 2mm 0;
        flex-shrink: 0;
      }

      [data-writing-mode="horizontal"] .columns-wrapper {
        flex-direction: row;
      }

      [data-writing-mode="horizontal"] .paper-page.has-columns .md-body {
        width: calc(50% - 5mm);
        height: 100%;
      }

      [data-writing-mode="horizontal"] .column-divider {
        border-left: 1px solid #cbd5e1;
        height: 100%;
        margin: 0 2mm;
        flex-shrink: 0;
      }

      .column-divider.no-border {
        border: none !important;
      }

      [data-writing-mode="vertical"] .md-body h1 {
        margin: 0 0 0 18px;
        font-size: 1.8em;
        border-left: 3px solid currentColor;
        padding-left: 10px;
        font-weight: 700;
      }

      [data-writing-mode="vertical"] .md-body h2 {
        margin: 0 12px 0 12px;
        padding-left: 8px;
        border-left: 1px solid currentColor;
        font-size: 1.3em;
        font-weight: 700;
        opacity: 0.9;
      }

      [data-writing-mode="vertical"] .md-body h3 {
        margin: 0 10px 0 10px;
        font-size: 1.1em;
        font-weight: 700;
        opacity: 0.85;
      }

      [data-writing-mode="vertical"] .md-body hr {
        margin: 0 14px;
        border: 0;
        border-right: 1px solid #cbd5e1;
        height: 100%;
      }

      [data-writing-mode="horizontal"] .md-body h1 {
        margin: 0 0 14px 0;
        font-size: 1.8em;
        border-bottom: 3px solid currentColor;
        padding-bottom: 8px;
        font-weight: 700;
      }

      [data-writing-mode="horizontal"] .md-body h2 {
        margin: 14px 0 10px 0;
        padding-bottom: 6px;
        border-bottom: 1px solid currentColor;
        font-size: 1.3em;
        font-weight: 700;
        opacity: 0.9;
      }

      [data-writing-mode="horizontal"] .md-body h3 {
        margin: 10px 0 8px 0;
        font-size: 1.1em;
        font-weight: 700;
        opacity: 0.85;
      }

      [data-writing-mode="horizontal"] .md-body hr {
        margin: 14px 0;
        border: 0;
        border-bottom: 1px solid #cbd5e1;
        width: 100%;
      }

      .md-body p {
        margin: 0;
        padding: 0;
        text-indent: 1em;
      }

      .md-body p.no-indent {
        text-indent: 0;
      }

      .md-body blockquote {
        margin: 8px 12px;
        padding: 8px 12px;
        border: none !important;
        background: rgba(0, 0, 0, 0.05);
        font-size: 0.95em;
        border-radius: 4px;
        box-sizing: border-box;
      }

      .md-body code:not(pre code),
      .md-body .inline-code {
        font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        background: rgba(0, 0, 0, 0.06);
        border: 1px solid rgba(0, 0, 0, 0.12);
        color: #0f172a;
        padding: 1px 3px;
        margin: 0 2px;
        border-radius: 3px;
        font-size: 0.85em;
        font-weight: 600;
        display: inline;
        box-decoration-break: clone;
        -webkit-box-decoration-break: clone;
        word-break: break-all;
      }

      .md-body pre {
        writing-mode: horizontal-tb !important;
        -webkit-writing-mode: horizontal-tb !important;
        direction: ltr !important;
        display: block;
        margin: 8px 14px;
        padding: 12px 16px;
        background: #0f172a;
        color: #f8fafc;
        font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        font-size: 0.85em;
        line-height: 1.65;
        border-radius: 8px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        overflow-x: auto;
        box-sizing: border-box;
        max-width: 100%;
      }

      .md-body pre code {
        writing-mode: horizontal-tb !important;
        -webkit-writing-mode: horizontal-tb !important;
        font-family: inherit;
        background: transparent;
        border: none;
        padding: 0;
        color: inherit;
        white-space: pre;
        line-height: inherit;
      }

      .tcy {
        text-combine-upright: all;
        -webkit-text-combine: horizontal;
        display: inline;
        margin: 0;
        padding: 0;
        letter-spacing: 0;
      }

      .bouten {
        text-emphasis: filled sesame;
        -webkit-text-emphasis: filled sesame;
        text-emphasis-position: over right;
        -webkit-text-emphasis-position: over right;
      }

      .paper-page.gutter-right {
        padding-right: calc(var(--page-padding-h) + 6mm) !important;
      }

      .paper-page.gutter-left {
        padding-left: calc(var(--page-padding-h) + 6mm) !important;
      }
    }

    @media (max-width: 1000px) {
      .editor-grid {
        grid-template-columns: 1fr;
      }

      .editor-panel {
        height: auto;
        min-height: 500px;
      }

      .text-input {
        min-height: 380px;
      }

      .preview-viewport {
        min-height: 480px;
        max-height: none;
      }
    }

    /* Fallback for browsers that don't support dvh */
    @supports not (height: 100dvh) {
      :root {
        --mobile-vh: 100vh;
      }
    }
    @supports (height: 100dvh) {
      :root {
        --mobile-vh: 100dvh;
      }
    }

    @media (max-width: 768px) {
      .app {
        height: var(--mobile-vh, 100vh);
      }

      .mobile-tab-bar {
        display: flex;
      }

      #mobileTabBoth {
        display: none;
      }

      /* --- 共通: editor-grid をフレックスカラムに --- */
      .editor-grid {
        display: flex;
        flex-direction: column;
        grid-template-columns: unset;
        flex: 1;
        min-height: 0;
      }

      /* --- 編集モード --- */
      .editor-grid.mode-edit .preview-container-wrapper {
        display: none !important;
      }

      .editor-grid.mode-edit .editor-panel {
        flex: 1;
        min-height: 0;
        height: auto;
        overflow: hidden;
        display: flex;
        flex-direction: column;
      }

      .editor-grid.mode-edit .editor-text-card {
        flex: 1;
        min-height: 0;
      }

      .editor-grid.mode-edit .editor-settings-card {
        flex: 1;
        min-height: 0;
        overflow-y: auto;
      }

      .editor-grid.mode-edit .text-input {
        flex: 1;
        min-height: 100px;
        height: auto;
      }

      .editor-grid.mode-edit .controls-main {
        flex-shrink: 0;
        padding-bottom: 4px;
      }

      /* --- プレビューモード --- */
      .editor-grid.mode-preview .editor-panel {
        display: none !important;
      }

      .editor-grid.mode-preview .preview-container-wrapper {
        flex: 1;
        min-height: 0;
        display: flex;
        flex-direction: column;
      }

      .editor-grid.mode-preview .preview-viewport {
        flex: 1;
        min-height: 0;
        max-height: none;
      }

    }

    @media (max-width: 600px) {
      .app {
        width: calc(100% - 16px);
        padding: 8px 0 16px;
      }

      .hero {
        padding: 12px 14px;
        border-radius: 12px;
      }

      .editor-panel {
        padding: 12px;
      }

      .form-row {
        grid-template-columns: 1fr !important;
        gap: 10px;
      }

      .form-col {
        width: 100%;
        min-width: 0;
      }

      .text-input {
        min-height: 150px;
      }

      .preview-viewport {
        padding: 16px 12px;
        min-height: 420px;
        max-height: none;
      }
    }

    @layer print {
      @media print {
        @page {
          margin: 0 !important;
        }

        html,
        body {
          width: var(--paper-w) !important;
          height: var(--paper-h) !important;
          background: #ffffff !important;
          color: #000000 !important;
          overflow: visible !important;
          margin: 0 !important;
          padding: 0 !important;
        }

        .no-print,
        .editor-panel,
        .hero,
        .mobile-tab-bar,
        .page-nav-bar,
        .loading-indicator,
        #measurerContainer {
          display: none !important;
        }

        .app,
        .editor-grid,
        .preview-container-wrapper,
        .preview-viewport,
        .pages-container {
          display: block !important;
          width: 100% !important;
          height: auto !important;
          max-height: none !important;
          margin: 0 !important;
          padding: 0 !important;
          border: none !important;
          background: transparent !important;
          box-shadow: none !important;
          overflow: visible !important;
          position: static !important;
          direction: ltr !important;
        }

        .paper-page {
          position: relative !important;
          top: auto !important;
          right: auto !important;
          left: auto !important;
          margin: 0 auto !important;
          width: var(--paper-w) !important;
          height: var(--paper-h) !important;
          min-width: var(--paper-w) !important;
          min-height: var(--paper-h) !important;
          box-shadow: none !important;
          padding: var(--page-padding-v) var(--page-padding-h) !important;
          transform: none !important;
          page-break-after: always !important;
          break-after: page !important;
          page-break-inside: avoid !important;
          break-inside: avoid !important;
          -webkit-print-color-adjust: exact;
          print-color-adjust: exact;
          box-sizing: border-box !important;
          overflow: hidden !important;
        }

        .paper-page:last-child,
        .paper-page:last-of-type {
          page-break-after: avoid !important;
          break-after: avoid !important;
        }

        .page-header-tag,
        .page-number-tag {
          display: block !important;
          color: #000000 !important;
        }
      }
    }