:root {
    --wb-bg: #f2f2f7;
    --wb-surface: #ffffff;
    --wb-text: #111111;
    --wb-muted: #6b6b6b;
    --wb-line: #e5e5ea;
    --wb-radius: 16px;
    --wb-radius-lg: 20px;
}

html, body {
    height: 100%;
}

body {
    background-color: var(--wb-bg);
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

.phone-container {
    width: 100%;
    max-width: 420px;
    height: 100vh;
    height: 100svh;
    max-height: 820px;
    margin: 0 auto;
    background-color: var(--wb-bg);
    border-radius: 28px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.12);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

@media (max-width: 768px) {
    .phone-container {
        width: 100%;
        max-width: none;
        height: 100vh;
        height: 100svh;
        max-height: none;
        border-radius: 0;
        border: none;
        box-shadow: none;
    }
}

.world-book-app-container {
    display: flex;
    flex-direction: column;
    background: var(--wb-bg);
    color: var(--wb-text);
    width: 100%;
    height: 100%;
}

.world-book-app-container .phone-app-header {
    background: rgba(255, 255, 255, 0.92);
    color: var(--wb-text);
    border-bottom: 1px solid var(--wb-line);
    box-shadow: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: calc(50px + var(--safe-inset-top, 0px));
    padding: var(--safe-inset-top, 0px) 12px 0;
    flex-shrink: 0;
    position: relative;
    z-index: 100;
}

@supports ((-webkit-backdrop-filter: blur(12px)) or (backdrop-filter: blur(12px))) {
    .world-book-app-container .phone-app-header {
        background: rgba(255, 255, 255, 0.72);
        -webkit-backdrop-filter: blur(18px);
        backdrop-filter: blur(18px);
    }
}

.world-book-app-container .phone-app-header-left,
.world-book-app-container .phone-app-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.world-book-header-right {
    position: relative;
    z-index: 50;
}

.world-book-app-container .phone-app-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--wb-text);
    letter-spacing: -0.2px;
}

.world-book-app-container .phone-app-back-btn,
.world-book-app-container .phone-app-add-friend-btn {
    width: 44px;
    height: 44px;
    border-radius: 9999px;
    background: transparent;
    border: 1px solid transparent;
    color: var(--wb-text);
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    touch-action: manipulation;
    user-select: none;
    transition: background-color 0.15s, transform 0.08s;
}

.world-book-app-container .phone-app-back-btn:active,
.world-book-app-container .phone-app-add-friend-btn:active {
    background: rgba(0, 0, 0, 0.06);
    transform: scale(0.98);
}

.world-book-app-content {
    flex: 1;
    overflow: hidden;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.world-book-tabs {
    display: flex;
    overflow-x: auto;
    padding: 10px 12px 12px;
    gap: 8px;
    background: rgba(255, 255, 255, 0.92);
    flex-shrink: 0;
    border-bottom: 1px solid var(--wb-line);
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
    touch-action: pan-x;
}

.world-book-tab-item {
    min-height: 44px;
    padding: 0 14px;
    background: var(--wb-surface);
    color: var(--wb-text);
    border-radius: 9999px;
    border: 1px solid var(--wb-line);
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s, color 0.15s, border-color 0.15s, transform 0.08s;
}

.world-book-tab-item:active {
    transform: scale(0.99);
}

.world-book-tab-item.active {
    background: #000000;
    color: #ffffff;
    border-color: #000000;
}

.world-book-list {
    flex: 1;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: var(--wb-bg);
}

.world-book-create-item {
    background: var(--wb-surface);
    border: 1px dashed rgba(0, 0, 0, 0.2);
    color: var(--wb-text);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px;
    cursor: pointer;
    font-weight: 600;
    font-size: 15px;
    border-radius: var(--wb-radius);
    user-select: none;
    transition: background-color 0.15s, transform 0.08s, border-color 0.15s;
    min-height: 56px;
}

.world-book-create-item:active {
    background: rgba(255, 255, 255, 0.7);
    border-color: rgba(0, 0, 0, 0.35);
    transform: scale(0.99);
}

.world-book-item {
    background: var(--wb-surface);
    border: 1px solid var(--wb-line);
    border-radius: var(--wb-radius);
    padding: 14px;
    cursor: pointer;
    box-shadow: none;
    transition: border-color 0.15s, transform 0.08s;
}

.world-book-item:active {
    border-color: rgba(0, 0, 0, 0.75);
    transform: scale(0.99);
}

.world-book-item-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--wb-text);
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.world-book-item-preview {
    font-size: 14px;
    color: var(--wb-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

.world-book-item-delete {
    min-height: 36px;
    padding: 0 12px;
    color: rgba(0, 0, 0, 0.4);
    font-size: 13px;
    border-radius: 9999px;
    border: 1px solid transparent;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    transition: background-color 0.15s, color 0.15s, border-color 0.15s, transform 0.08s;
}

.world-book-item-delete:active {
    background: rgba(0, 0, 0, 0.06);
    border-color: rgba(0, 0, 0, 0.14);
    color: rgba(0, 0, 0, 0.7);
    transform: scale(0.98);
}

.empty-state {
    text-align: center;
    color: var(--wb-muted);
    padding: 24px 16px;
    font-size: 14px;
}

.world-book-editor {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--wb-bg);
    z-index: 120;
    display: flex;
    flex-direction: column;
    transform: translate3d(0, 100%, 0);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

.world-book-editor.active {
    transform: translate3d(0, 0, 0);
}

.world-book-editor-content {
    flex: 1;
    min-height: 0;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    touch-action: pan-y;
}

.world-book-entry-title {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--wb-line);
    border-radius: 12px;
    outline: none;
    background: var(--wb-surface);
    color: var(--wb-text);
    font-size: 17px;
    font-weight: 600;
    line-height: 1.2;
}

.world-book-entry-title:focus {
    border-color: rgba(0, 0, 0, 0.6);
}

.world-book-entry-content {
    flex: 1;
    width: 100%;
    min-height: 220px;
    padding: 12px;
    border: 1px solid var(--wb-line);
    border-radius: 12px;
    outline: none;
    background: var(--wb-surface);
    color: rgba(0, 0, 0, 0.85);
    font-size: 16px;
    line-height: 1.6;
    resize: none;
}

.world-book-entry-content:focus {
    border-color: rgba(0, 0, 0, 0.6);
}

.world-book-settings-panel {
    padding: 12px;
    border: 1px solid var(--wb-line);
    border-radius: var(--wb-radius);
    background: var(--wb-surface);
}

.world-book-settings-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
}

.world-book-settings-row + .world-book-settings-row {
    border-top: 1px solid rgba(0, 0, 0, 0.04);
}

.world-book-setting-label {
    font-size: 13px;
    color: var(--wb-muted);
    font-weight: 600;
    flex: 0 0 auto;
}

.world-book-setting-options {
    display: flex;
    gap: 14px;
    flex: 1;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.world-book-setting-input {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--wb-line);
    border-radius: 12px;
    font-size: 16px;
    color: var(--wb-text);
    outline: none;
    background: var(--wb-surface);
}

.world-book-setting-input:focus {
    border-color: rgba(0, 0, 0, 0.6);
}

.world-book-settings-row.keyword-row {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
}

.world-book-keyword-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.world-book-keyword-chip {
    padding: 6px 10px;
    border: 1px solid var(--wb-line);
    border-radius: 9999px;
    font-size: 13px;
    color: var(--wb-text);
    background: var(--wb-surface);
}

.wb-option-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    font-size: 14px;
    color: var(--wb-text);
    cursor: pointer;
    user-select: none;
    touch-action: manipulation;
}

.wb-radio {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border: 1.5px solid rgba(0, 0, 0, 0.25);
    border-radius: 50%;
    position: relative;
    transition: border-color 0.15s, background-color 0.15s;
    margin: 0;
    flex: 0 0 auto;
}

.wb-radio:checked {
    border-color: #000000;
}

.wb-radio:checked::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    background: #000000;
    border-radius: 50%;
}

.popup-window {
    position: fixed;
    top: 10vh;
    left: 50%;
    transform: translateX(-50%) scale(0.98);
    width: calc(100% - 24px);
    max-width: 360px;
    background: rgba(255, 255, 255, 0.96);
    border-radius: var(--wb-radius-lg);
    border: 1px solid var(--wb-line);
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.14);
    z-index: 140;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
    pointer-events: none;
}

@supports ((-webkit-backdrop-filter: blur(12px)) or (backdrop-filter: blur(12px))) {
    .popup-window {
        background: rgba(255, 255, 255, 0.7);
        -webkit-backdrop-filter: blur(18px);
        backdrop-filter: blur(18px);
    }
}

.popup-window.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) scale(1);
    pointer-events: auto;
}

.popup-window-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.popup-window-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.2px;
    color: var(--wb-text);
}

.popup-window-content {
    padding: 12px 16px 0;
}

.popup-window-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 14px 16px 16px;
}

.world-book-input {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--wb-line);
    border-radius: 12px;
    background: var(--wb-surface);
    font-size: 16px;
    line-height: 1.4;
    outline: none;
}

.world-book-input:focus {
    border-color: rgba(0, 0, 0, 0.6);
}

.reset-btn, .save-btn {
    min-height: 44px;
    padding: 10px 16px;
    border-radius: 12px;
    cursor: pointer;
    border: 1px solid transparent;
    font-size: 15px;
    font-weight: 600;
    user-select: none;
    touch-action: manipulation;
    transition: transform 0.08s, background-color 0.15s, border-color 0.15s;
}

.reset-btn {
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--wb-text);
    border-color: var(--wb-line);
}

.save-btn {
    background-color: #000000;
    color: #ffffff;
}

.reset-btn:active, .save-btn:active {
    transform: scale(0.99);
}

.world-book-menu-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: var(--wb-surface);
    border: 1px solid var(--wb-line);
    border-radius: 14px;
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.14);
    z-index: 200;
    min-width: 180px;
    display: none;
    flex-direction: column;
    padding: 6px;
}

.world-book-menu-dropdown.active {
    display: flex;
}

.menu-item {
    min-height: 44px;
    padding: 10px 12px;
    font-size: 14px;
    color: var(--wb-text);
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    border-radius: 10px;
    user-select: none;
    transition: background-color 0.15s;
    touch-action: manipulation;
}

.menu-item:active {
    background: rgba(0, 0, 0, 0.06);
}

.phone-app-toast {
    position: fixed;
    bottom: calc(16px + var(--safe-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: rgba(255, 255, 255, 0.92);
    color: var(--wb-text);
    padding: 12px 18px;
    border-radius: 9999px;
    border: 1px solid var(--wb-line);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
    z-index: 260;
    opacity: 0;
    transition: transform 0.25s, opacity 0.25s;
    max-width: calc(100% - 32px);
    text-align: center;
    font-weight: 600;
    pointer-events: none;
}

.phone-app-toast.active {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}