:root {
        --font-ui: "Segoe UI", "Yu Gothic UI", "Hiragino Sans", "Meiryo", sans-serif;
        --app-shell-max-width: 1080px;
        --app-shell-half-width: calc(var(--app-shell-max-width) / 2);
        --page-bg: rgb(231, 244, 242);
        --panel: #ffffff;
        --panel-strong: #ffffff;
        --border: rgba(26, 53, 74, 0.12);
        --text: #11324d;
        --muted: #5d7388;
        --accent: #0f8f7b;
        --accent-dark: #0c7464;
        --accent-rgb: 15,143,123;
        --accent-surface-medium: rgba(var(--accent-rgb), 0.14);
        --accent-surface-light: rgba(var(--accent-rgb), 0.05);
        --accent-surface-hover: rgba(var(--accent-rgb), 0.10);
        --shadow: 0 24px 45px rgba(18, 41, 61, 0.14);
      }

      * {
        box-sizing: border-box;
      }

      body {
        margin: 0;
        min-height: 100vh;
        font-family: var(--font-ui);
        color: var(--text);
        background: var(--page-bg);
        display: grid;
        place-items: center;
        padding: 24px 16px;
      }

      body.ios-keyboard-stable-layout {
        min-height: 100dvh;
        place-items: start center;
        align-content: start;
      }

      input,
      button,
      select,
      textarea,
      pre {
        font-family: inherit;
      }

      .app {
        position: relative;
        --card-fixed-edge-gap: max(16px, calc(50% - var(--app-shell-half-width)));
        --fixed-nav-edge-gap: max(16px, calc(50% - var(--app-shell-half-width)));
        --top-nav-button-size: calc(38px + var(--app-font-size-offset, 0px));
        --top-nav-icon-size: calc(20px + var(--app-font-size-offset, 0px));
        --top-nav-radius: calc(12px + (var(--app-font-size-offset, 0px) / 2));
        --top-nav-ticket-font-size: calc(13px + var(--app-font-size-offset, 0px));
        --top-nav-ticket-gap: calc(4px + (var(--app-font-size-offset, 0px) / 2));
        --top-nav-ticket-padding-x: calc(8px + (var(--app-font-size-offset, 0px) / 2));
        --top-nav-top: calc(30px + var(--app-font-size-offset, 0px));
        --top-nav-side-offset: calc(8px + (var(--app-font-size-offset, 0px) / 2));
        width: min(100%, var(--app-shell-max-width));
        background: var(--panel);
        border: 1px solid var(--border);
        border-radius: 24px;
        padding: 28px;
        box-shadow: 0 24px 45px rgba(21, 43, 62, 0.14);
        min-width: 0;
      }

      .top-settings {
        display: contents;
      }

      .top-nav-link {
        width: var(--top-nav-button-size);
        min-height: var(--top-nav-button-size);
        border: none;
        border-radius: var(--top-nav-radius);
        background: rgba(255, 255, 255, 0.85);
        padding: 0;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        color: var(--accent);
        text-decoration: none;
      }

      .top-nav-link:hover {
        background: var(--accent-surface-hover);
      }

      .top-nav-link svg {
        width: var(--top-nav-icon-size);
        height: var(--top-nav-icon-size);
        stroke: currentColor;
        fill: none;
        stroke-width: 2;
        stroke-linecap: round;
        stroke-linejoin: round;
      }

      .ticket-nav-link {
        width: auto;
        min-width: 0;
        padding: 0 var(--top-nav-ticket-padding-x);
        gap: var(--top-nav-ticket-gap);
        font-size: var(--top-nav-ticket-font-size);
        font-weight: 700;
        white-space: nowrap;
      }

      .ticket-nav-link svg {
        flex: 0 0 auto;
      }

      .ticket-points {
        line-height: 1;
        font-variant-numeric: tabular-nums;
      }

      .nav-right-1 {
        position: fixed;
        top: var(--top-nav-top);
        right: calc(var(--fixed-nav-edge-gap) + 136px + (var(--app-font-size-offset, 0px) * 3));
        z-index: 20;
      }

      .nav-right-2 {
        position: fixed;
        top: var(--top-nav-top);
        right: calc(var(--fixed-nav-edge-gap) + 88px + (var(--app-font-size-offset, 0px) * 2));
        z-index: 20;
      }

      .nav-right-3 {
        position: fixed;
        top: var(--top-nav-top);
        right: calc(var(--fixed-nav-edge-gap) + 48px + var(--app-font-size-offset, 0px));
        z-index: 20;
      }

      .nav-right-4 {
        position: fixed;
        top: var(--top-nav-top);
        right: calc(var(--fixed-nav-edge-gap) + var(--top-nav-side-offset));
        z-index: 20;
      }

      .top-points-button {
        position: fixed;
        top: var(--top-nav-top);
        left: calc(24px + (var(--app-font-size-offset, 0px) / 2));
        z-index: 20;
        min-height: 10px;
        width: auto;
        min-width: 0;
        padding: 0 var(--top-nav-ticket-padding-x);
        border-radius: var(--top-nav-radius);
        border: 1px solid rgba(var(--accent-rgb), 0.28);
        background: rgba(var(--accent-rgb), 0.10);
        color: var(--accent-dark);
        font-size: var(--top-nav-ticket-font-size);
        font-weight: 700;
        white-space: nowrap;
      }

      .top-admin-button {
        top: calc(var(--top-nav-top) + var(--top-nav-button-size) + 8px);
        left: calc(24px + (var(--app-font-size-offset, 0px) / 2));
        display: inline-flex;
        align-items: center;
        justify-content: center;
        text-decoration: none;
        min-height: var(--top-nav-button-size);
      }

      .top-points-button:hover {
        background: rgba(var(--accent-rgb), 0.18);
      }

      .top-points-button:disabled {
        background: rgba(97, 120, 142, 0.12);
        color: #4f6273;
        cursor: default;
      }

      .eyebrow {
        margin: 30px 0 8px;
        margin-left: 8px;
        font-size: calc(15px + var(--app-font-size-offset, 0px));
        font-weight: 700;
        letter-spacing: 0.08em;
        color: var(--accent-dark);
        text-transform: uppercase;
      }

      h1.hero-title {
        margin: 0;
        margin-left: 8px;
        font-size: calc(clamp(54px, 12vw, 80px) + var(--app-font-size-offset, 0px));
        line-height: 1.08;
        letter-spacing: 0.01em;
        font-family: 'Poppins', sans-serif !important;
      }

      .lead {
        margin: 12px 0 16px;
        margin-left: 8px;
        color: var(--muted);
        font-size: 14px;
      }

      .lead-row {
        margin: 12px 0 16px;
        margin-left: 8px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        flex-wrap: wrap;
      }

      .lead-row .lead {
        margin: 0;
      }

      form {
        display: grid;
        grid-template-columns: 1fr minmax(220px, 244px);
        gap: 12px;
        align-items: stretch;
      }

      .search-input-wrap {
        position: relative;
        min-width: 0;
      }

      .search-actions {
        display: flex;
        gap: 12px;
        align-self: start;
      }

      #questionButton {
        flex: 0 0 auto;
        width: auto;
        white-space: nowrap;
      }

      #searchButton {
        flex: 3 1 0;
      }

      #textInput {
        width: 100%;
        min-width: 0;
        border: 1px solid rgba(var(--accent-rgb), 0.2);
        border-radius: 14px;
        background: var(--panel-strong);
        padding: 15px 68px 15px 16px;
        min-height: 52px;
        font-size: 16px;
        color: var(--text);
        outline: none;
        resize: none;
        overflow-y: hidden;
        overflow-x: hidden;
        line-height: 1.5;
        white-space: pre-wrap;
        overflow-wrap: anywhere;
        word-break: break-word;
        transition: border-color 0.2s ease, box-shadow 0.2s ease;
      }

      #textInput:focus {
        border-color: rgba(var(--accent-rgb), 0.7);
        box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.14);
      }

      #textInput.question-mode {
        min-height: 52px;
        padding-top: 16px;
        padding-bottom: 16px;
        overflow-x: hidden;
        overflow-y: hidden;
        white-space: pre-wrap;
        overflow-wrap: anywhere;
        word-break: break-word;
      }

      .text-input-count {
        position: absolute;
        right: 14px;
        bottom: 15px;
        font-size: 12px;
        line-height: 1;
        color: var(--muted);
        pointer-events: none;
        user-select: none;
      }

      button {
        border: none;
        border-radius: 14px;
        background: var(--accent);
        color: #ffffff;
        padding: 0 18px;
        min-height: 52px;
        font-size: 16px;
        font-weight: 700;
        cursor: pointer;
        transition: background-color 0.2s ease, transform 0.2s ease;
      }

      button:hover {
        background: var(--accent-dark);
        transform: translateY(-1px);
      }

      button.secondary {
        background: rgba(255, 255, 255, 0.96);
        color: var(--accent-dark);
        border: 1px solid rgba(var(--accent-rgb), 0.22);
      }

      button.secondary:hover,
      button.secondary:not(.active):hover {
        background: rgba(255, 255, 255, 0.96);
      }

      button.secondary.active,
      button.secondary.active:hover {
        background: rgba(var(--accent-rgb), 0.18);
        color: var(--accent-dark);
        border-color: rgba(var(--accent-rgb), 0.22);
      }

      button:disabled {
        background: rgba(var(--accent-rgb), 0.55);
        color: rgba(255, 255, 255, 0.9);
        cursor: wait;
        transform: none;
      }

      button.secondary:disabled {
        background: rgba(255, 255, 255, 0.96);
        color: var(--accent-dark);
        border: 1px solid rgba(var(--accent-rgb), 0.22);
      }

      .card {
        --shared-card-margin-top: 20px;
        --shared-card-border: 1px solid var(--border);
        --shared-card-radius: 18px;
        --shared-card-background: #ffffff;
        --shared-card-overflow: hidden;
      }

      .card::after {
        content: "";
        display: block;
        height: 10px;
        background: #ffffff;
      }

      .card-header {
        --shared-card-header-padding: 14px 18px;
        --shared-card-header-border-color: var(--border);
        --shared-card-header-font-size: 14px;
        --shared-card-header-font-weight: 700;
        --shared-card-header-color: var(--muted);
        --shared-card-header-bg: var(--accent-surface-medium);
        --shared-card-header-radius: 10px 10px 0 0;
      }

      .card-header.linkable {
        --shared-card-header-link-color: var(--accent-dark);
        --shared-card-header-link-hover-color: var(--accent-dark);
        --shared-card-header-link-hover-bg: var(--accent-surface-hover);
      }

      .card-header.linkable:hover {
        color: var(--accent-dark);
      }

      .summary-grid {
        width: 100%;
        margin: 20px auto 0;
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 16px;
        align-items: stretch;
      }

      .summary-dictionary-card {
        width: 100%;
      }

      .summary-history-card {
        width: 100%;
      }

      .summary-grid > .card {
        width: 100%;
        min-width: 0;
        display: flex;
        flex-direction: column;
        height: 100%;
        margin-top: 0;
      }

      .dict-refresh-btn {
        border: 1px solid rgba(var(--accent-rgb), 0.3);
        background: transparent;
        color: var(--accent-dark);
        border-radius: 8px;
        min-height: 30px;
        padding: 0 10px;
        font-size: 13px;
        font-weight: 700;
        cursor: pointer;
        transform: none;
        width: 100%;
        min-width: 0;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 6px;
      }

      .dict-refresh-btn:hover {
        background: var(--accent-surface-hover);
        transform: none;
      }

      .dict-refresh-btn svg {
        width: 15px;
        height: 15px;
        flex-shrink: 0;
      }

      .dict-cols {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        width: 100%;
        gap: 0 18px;
        min-width: 0;
      }

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

      .dict-col-label {
        font-size: 11px;
        font-weight: 700;
        color: var(--muted);
        padding: 4px 2px 6px;
        letter-spacing: 0.05em;
        text-transform: uppercase;
      }

      .dict-word-list {
        list-style: none;
        margin: 0;
        padding: 0;
        display: grid;
        width: 100%;
        gap: 6px;
        min-width: 0;
      }

      .dict-word-list li {
        width: 100%;
        min-width: 0;
      }

      .dict-word-btn {
        --shared-entry-padding: 8px 10px;
        --shared-entry-border-color: rgba(var(--accent-rgb), 0.16);
        --shared-entry-radius: 10px;
        --shared-entry-bg: var(--accent-surface-light);
        --shared-entry-hover-bg: var(--accent-surface-medium);
        --shared-entry-color: var(--text);
        --shared-entry-gap: 6px;
        --shared-entry-font-size: 13px;
        --shared-entry-font-weight: 600;
        --shared-entry-height: 38px;
        transform: none;
      }

      .dict-word-btn:hover {
        transform: none;
      }

      .info-body {
        margin: 0;
        padding: 10px 14px 14px;
        min-width: 0;
        overflow: hidden;
        flex: 1;
      }

      .dict-footer {
        padding: 0 14px 14px;
        display: flex;
        justify-content: stretch;
      }

      .item-list {
        list-style: none;
        margin: 0;
        padding: 0;
        display: grid;
        width: 100%;
        gap: 10px;
        min-width: 0;
      }

      .item-list li {
        margin: 0;
        width: 100%;
        min-width: 0;
      }

      .history-button {
        --shared-entry-padding: 12px 14px;
        --shared-entry-border-color: rgba(var(--accent-rgb), 0.16);
        --shared-entry-radius: 12px;
        --shared-entry-bg: var(--accent-surface-light);
        --shared-entry-hover-bg: var(--accent-surface-medium);
        --shared-entry-color: var(--text);
        --shared-entry-gap: 12px;
        --shared-entry-font-size: 14px;
        --shared-entry-font-weight: 600;
        --shared-entry-min-height: 38px;
      }

      .history-button.deleted-entry {
        --shared-entry-border-color: rgba(97, 120, 143, 0.18);
        --shared-entry-bg: #f2f4f7;
        --shared-entry-hover-bg: #f2f4f7;
        --shared-entry-color: #8a99a8;
        cursor: default;
        pointer-events: none;
      }

      .history-button.deleted-entry .item-text,
      .history-button.deleted-entry .history-item-status {
        color: #8a99a8;
      }

      .history-item-status {
        margin-left: auto;
        flex: 0 0 auto;
        font-size: 12px;
        font-weight: 700;
        color: #7b8b99;
        white-space: nowrap;
      }

      .empty-state {
        margin: 0;
        padding: 10px 4px 4px;
        color: var(--muted);
        font-size: 14px;
      }

      pre {
        margin: 0;
        min-height: 150px;
        padding: 14px 18px;
        white-space: pre-wrap;
        word-break: break-word;
        overflow-wrap: anywhere;
        font-size: 15px;
        line-height: 1.75;
        color: var(--text);
      }

      #result::selection {
        background: rgba(var(--accent-rgb), 0.32);
        color: var(--text);
      }

      #result::-moz-selection {
        background: rgba(var(--accent-rgb), 0.32);
        color: var(--text);
      }

      ::highlight(meaning-selection) {
        background: rgba(var(--accent-rgb), 0.32);
        color: var(--text);
      }

      pre.result-empty {
        min-height: 0;
      }

      pre.result-compact {
        min-height: 0;
        padding-top: 10px;
        padding-bottom: 10px;
      }

      .result-status {
        display: inline-flex;
        align-items: center;
        margin-left: 10px;
        font-size: 14px;
        font-weight: 700;
        color: var(--accent-dark);
        white-space: nowrap;
      }

      .result-status-subtle {
        margin-left: 0;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        font-size: inherit;
        font-weight: 500;
        line-height: inherit;
        color: #7a8591;
        flex: 0 0 auto;
      }

      .index-search-result-actions {
        display: flex;
        align-items: center;
        justify-content: flex-end;
        gap: 8px;
        min-width: 0;
        flex-shrink: 0;
      }

      .result-status:empty {
        display: none;
      }

      .meaning-selection-popup {
        position: fixed;
        z-index: 1200;
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        gap: 6px;
        padding: 0;
        border: none;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
        pointer-events: auto;
        transform: translateX(-50%);
      }

      .meaning-selection-popup-row {
        display: inline-flex;
        align-items: center;
        gap: 6px;
      }

      .meaning-selection-popup-btn {
        min-width: 36px;
        height: 36px;
        padding: 0 10px;
        border: 1px solid rgba(var(--accent-rgb), 0.24);
        border-radius: 10px;
        background: rgba(255, 255, 255, 0.98);
        color: var(--accent-dark);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 18px;
        font-weight: 800;
        cursor: pointer;
        touch-action: manipulation;
        box-shadow: 0 10px 24px rgba(18, 41, 61, 0.18);
      }

      .meaning-selection-popup-btn:disabled {
        cursor: default;
        background: rgba(228, 234, 239, 0.96);
        color: rgba(97, 120, 142, 0.85);
        border-color: rgba(97, 120, 142, 0.22);
        box-shadow: none;
      }

      .meaning-selection-popup-btn:hover {
        background: rgba(var(--accent-rgb), 0.10);
      }

      .meaning-selection-popup-btn:disabled:hover {
        background: rgba(228, 234, 239, 0.96);
      }

      .meaning-selection-popup-btn.commit-btn {
        min-width: 54px;
        width: auto;
        flex: 0 0 auto;
        background: var(--accent-dark);
        border-color: var(--accent-dark);
        color: #ffffff;
        font-size: 14px;
        line-height: 1;
        padding: 0 14px;
        white-space: nowrap;
        word-break: keep-all;
      }

      .meaning-selection-popup-btn.commit-btn:hover {
        background: var(--accent);
        border-color: var(--accent);
      }

      .meaning-selection-popup-btn.close-btn {
        min-width: 36px;
        width: 36px;
        height: 36px;
        padding: 0;
        border-color: rgba(216, 95, 95, 0.28);
        background: rgba(255, 226, 226, 0.96);
        color: #c25757;
        font-size: 14px;
        font-weight: 700;
        line-height: 1;
        box-shadow: 0 8px 18px rgba(181, 85, 85, 0.14);
      }

      .meaning-selection-popup-btn.close-btn:hover {
        background: rgba(255, 214, 214, 0.98);
        border-color: rgba(216, 95, 95, 0.36);
      }

      @media (max-width: 640px) {
        .app {
          margin-bottom: 12px;
          padding: 20px;
          border-radius: 20px;
        }

        form {
          grid-template-columns: 1fr;
        }

        .search-actions {
          display: flex;
        }

        .summary-grid {
          width: 100%;
          grid-template-columns: 1fr;
          gap: 14px;
        }

        button {
          width: 100%;
        }

        pre {
          min-height: 130px;
        }
      }