/* --- MUI-like Design System --- */
:root {
    /* Font */
    --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

    /* Spacing Unit */
    --spacing-unit: 8px;

    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;

    /* Transitions */
    --transition-duration: 0.2s;
    --transition-timing: ease-in-out;

    /* Shadows (Elevation) */
    --shadow-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    --shadow-3: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
    --shadow-4: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
    --shadow-5: 0 19px 38px rgba(0,0,0,0.30), 0 15px 12px rgba(0,0,0,0.22);

    /* Light Mode Palette */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #eeeeee;
    --bg-input: #f0f0f0;
    --bg-user-message: #e3f2fd;
    --bg-model-message: #ffffff;
    --bg-system-message: #fffde7;
    --bg-error-message: #ffebee;
    --bg-button: #1976d2;
    --bg-button-hover: #1565c0;
    --bg-button-disabled: rgba(0, 0, 0, 0.12);
    --bg-button-action: #757575;
    --bg-button-action-hover: #616161;
    --bg-button-delete: #d32f2f;
    --bg-button-delete-hover: #c62828;
    --bg-button-retry: #388e3c;
    --bg-button-retry-hover: #2e7d32;
    --bg-button-edit: #ffa000;
    --bg-button-edit-hover: #ff8f00;
    --bg-button-duplicate: #546e7a;
    --bg-button-duplicate-hover: #455a64;
    --bg-button-export: #0288d1;
    --bg-button-export-hover: #0277bd;
    --bg-button-save: #388e3c;
    --bg-button-save-hover: #2e7d32;
    --bg-button-cancel: #757575;
    --bg-button-cancel-hover: #616161;
    --bg-button-update: #1976d2;
    --bg-button-update-hover: #1565c0;
    --header-color-default: #1976d2;
    --bg-header: var(--header-color-custom, var(--header-color-default));
    --bg-message-actions: rgba(255, 255, 255, 0.9);
    --message-bubble-opacity: 1;
    --overlay-opacity-value: 0.75;
    --bg-overlay-light: rgba(255, 255, 255, var(--overlay-opacity-value));

    --text-primary: #212121;
    --text-secondary: #757575;
    --text-light: #ffffff;
    --text-disabled: rgba(0, 0, 0, 0.26);
    --text-error: #b71c1c;
    --text-link: #1976d2;
    --text-placeholder: #9e9e9e;
    --text-system: #5d4037;

    --border-primary: #e0e0e0;
    --border-secondary: #bdbdbd;
    --border-tertiary: #f5f5f5;
    --border-danger: #ef9a9a;
    --border-system: #fff59d;

    --badge-color: #ffab00;
    --badge-size: 10px;
}

body.dark-mode {
    /* Dark Mode Palette */
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #272727;
    --bg-input: #2c2c2c;
    --bg-user-message: #0d47a1;
    --bg-model-message: #272727;
    --bg-system-message: #28354A;
    --bg-error-message: #4e1010;
    --bg-button: #90caf9;
    --bg-button-hover: #e3f2fd;
    --bg-button-disabled: rgba(255, 255, 255, 0.12);
    --bg-button-action: #424242;
    --bg-button-action-hover: #616161;
    --bg-button-delete: #ef9a9a;
    --bg-button-delete-hover: #ffcdd2;
    --bg-button-retry: #a5d6a7;
    --bg-button-retry-hover: #c8e6c9;
    --bg-button-edit: #ffe082;
    --bg-button-edit-hover: #fff8e1;
    --bg-button-duplicate: #b0bec5;
    --bg-button-duplicate-hover: #eceff1;
    --bg-button-export: #81d4fa;
    --bg-button-export-hover: #b3e5fc;
    --bg-button-save: #a5d6a7;
    --bg-button-save-hover: #c8e6c9;
    --bg-button-cancel: #bdbdbd;
    --bg-button-cancel-hover: #e0e0e0;
    --bg-button-update: #90caf9;
    --bg-button-update-hover: #e3f2fd;
    --header-color-default: #007aff;
    --bg-header: var(--header-color-custom, var(--header-color-default));
    --bg-message-actions: rgba(40, 40, 40, 0.9);
    --bg-overlay-dark: rgba(18, 18, 18, var(--overlay-opacity-value));

    --text-primary: #e0e0e0;
    --text-secondary: #bdbdbd;
    --text-light: #121212;
    --text-disabled: rgba(255, 255, 255, 0.3);
    --text-error: #ffcdd2;
    --text-link: #90caf9;
    --text-placeholder: #757575;
    --text-system: #B0C4DE;

    --border-primary: #424242;
    --border-secondary: #616161;
    --border-tertiary: #212121;
    --border-danger: #ef9a9a;
    --border-system: #3A506B;
}

/* --- Base Styles & Resets --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html, body {
    height: 100%;
    font-family: var(--font-family);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    overscroll-behavior-y: contain;
    transition: background-color var(--transition-duration) var(--transition-timing), color var(--transition-duration) var(--transition-timing);
    overflow: hidden;
    font-size: 14px;
    line-height: 1.5;
}
button {
    cursor: pointer;
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
    border-radius: var(--border-radius-sm);
    border: none;
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    background-color: var(--bg-button);
    color: var(--text-light);
    transition: background-color var(--transition-duration) var(--transition-timing), box-shadow var(--transition-duration) var(--transition-timing);
    box-shadow: var(--shadow-1);
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-unit);
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
}
button:hover:not(:disabled) {
    background-color: var(--bg-button-hover);
    box-shadow: var(--shadow-2);
}
button:disabled {
    background-color: var(--bg-button-disabled);
    color: var(--text-disabled);
    box-shadow: none;
    cursor: not-allowed;
}
input, select, textarea {
    width: 100%;
    padding: calc(var(--spacing-unit) * 1.5);
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    margin-bottom: var(--spacing-unit);
    background-color: var(--bg-input);
    color: var(--text-primary);
    transition: background-color var(--transition-duration) var(--transition-timing), border-color var(--transition-duration) var(--transition-timing);
}
input:focus, select:focus, textarea:focus {
    outline: 2px solid var(--bg-button);
    outline-offset: -1px;
    border-color: var(--bg-button);
}
textarea {
    min-height: 100px;
    resize: vertical;
}
label {
    display: block;
    margin-bottom: var(--spacing-unit);
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-secondary);
}
::placeholder { color: var(--text-placeholder); opacity: 1; }
.hidden { display: none !important; }

/* Material Symbols Base Style */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  user-select: none;
  vertical-align: middle;
}

/* --- App Structure --- */
.app-container {
    display: flex;
    position: relative;
    height: 100%;
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--bg-primary);
    overflow: hidden;
}
body:not(.dark-mode) .app-container {
    box-shadow: var(--shadow-4);
}

/* --- Header --- */
.app-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
    background-color: var(--bg-header);
    color: var(--text-light);
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 10;
    transition: background-color var(--transition-duration) var(--transition-timing);
    gap: var(--spacing-unit);
    box-shadow: var(--shadow-2);
}
.app-header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin: 0;
    margin-right: auto;
}
.header-button {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 24px;
    padding: var(--spacing-unit);
    line-height: 1;
    min-width: auto;
    flex-shrink: 0;
    border-radius: 50%;
    box-shadow: none;
}
.header-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}
#history-screen .app-header {
    flex-direction: row-reverse;
    justify-content: flex-start;
}
#history-screen .app-header h1#history-title {
    margin-right: 0;
    margin-left: auto;
    text-align: right;
}
.header-save-button {
    padding: 6px 12px;
    font-size: 0.8rem;
    background-color: transparent;
    border: 1px solid var(--text-light);
}
.header-save-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}
.new-chat-button {
    padding: 6px 12px;
    font-size: 0.8rem;
    background-color: var(--bg-button-save);
    color: var(--text-primary);
}
body.dark-mode .new-chat-button {
    color: var(--text-light);
}

/* --- Screen Transitions --- */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease-in-out;
    background-color: var(--bg-secondary);
    z-index: 0;
}
.screen.active {
    transform: translateX(0);
    z-index: 1;
}

/* --- Chat Screen --- */
#chat-screen {
    position: relative;
    z-index: 0;
    background-size: cover;
    background-position: center;
    /* background-imageプロパティを削除 */
    /* フェードインは一旦廃止し、シンプルな切り替えにする */
    transition: background-image 0.3s ease-in-out; 
}

/* 背景画像用の擬似要素を追加 */
#chat-screen::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: var(--chat-background-image, none); /* CSS変数から画像を設定 */
    background-size: cover;
    background-position: center;
    opacity: 0; /* 初期状態は透明 */
    transition: opacity 0.8s ease-in-out; /* フェード効果を0.8秒に設定 */
    z-index: 0; /* オーバーレイより後ろ */
}

/* このクラスが付与されたら、擬似要素をフェードインさせる */
#chat-screen.background-visible::before {
    opacity: 1;
}



#chat-overlay {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-color: var(--bg-overlay-light);
    opacity: var(--overlay-opacity-value, 0.75);
    transition: opacity 0.5s ease-in-out, background-color var(--transition-duration) var(--transition-timing);
    z-index: 0; /* コンテンツより後ろ、背景より手前 */
}

body.dark-mode #chat-overlay {
    background-color: var(--bg-overlay-dark);
}

.main-content {
    flex-grow: 1;
    overflow-y: auto;
    padding: calc(var(--spacing-unit) * 2);
    position: relative;
    z-index: 1;
    touch-action: pan-y;
    padding-bottom: 40px;
}

#chat-screen .main-content {
    background-color: transparent;
    touch-action: pan-x pan-y pinch-zoom;
}
#chat-screen .app-header,
#chat-screen .chat-input-area {
    z-index: 2;
}

/* --- System Prompt --- */
.system-prompt-area {
    padding: calc(var(--spacing-unit) * 1.5);
    border: 1px solid var(--border-system);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-system-message);
    color: var(--text-system);
    transition: all var(--transition-duration) var(--transition-timing);
    position: relative;
    overflow: hidden;
    max-height: 500px;
    margin-top: 0;
    margin-bottom: calc(var(--spacing-unit) * 2);
}
.system-prompt-area summary {
    font-weight: 500;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-system);
}

/* --- Message Bubbles --- */
.message-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-unit);
}
.message {
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius-lg);
    max-width: var(--message-max-width, 85%);
    min-width: 220px;
    position: relative;
    word-wrap: break-word;
    color: var(--text-primary);
    transition: background-color var(--transition-duration) var(--transition-timing), color var(--transition-duration) var(--transition-timing);
    box-shadow: var(--shadow-1);
    margin-top: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 3);
}
.message:first-child { margin-top: 0; }
.message.user {
    background-color: color-mix(in srgb, var(--bg-user-message) calc(var(--message-bubble-opacity, 1) * 100%), transparent);
    align-self: flex-end;
    border-bottom-right-radius: var(--border-radius-sm);
}
.message.model {
    background-color: color-mix(in srgb, var(--bg-model-message) calc(var(--message-bubble-opacity, 1) * 100%), transparent);
    align-self: flex-start;
    border-bottom-left-radius: var(--border-radius-sm);
    max-width: 90%;
}
.message.error {
    background-color: var(--bg-error-message);
    color: var(--text-error);
}

/* --- Message Actions --- */
.message-actions, .message-cascade-controls {
    position: absolute;
    display: none;
    flex-wrap: nowrap;
    gap: var(--spacing-unit);
    background: var(--bg-message-actions);
    padding: var(--spacing-unit);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-2);
    z-index: 2;
    transition: opacity var(--transition-duration) var(--transition-timing);
    width: max-content;
    white-space: nowrap;
}
.message-actions { bottom: calc(-1 * var(--spacing-unit) * 5.5); }
.message-cascade-controls {
    top: calc(-1 * var(--spacing-unit) * 5.5);
    left: 0;
    align-items: center;
}
.message.show-actions .message-actions { display: flex; }
.message.model.show-actions .message-cascade-controls { display: flex; }

.message.user .message-actions { right: 0; }
.message.model .message-actions { left: 0; }

.message-actions button, .message-cascade-controls button {
    padding: calc(var(--spacing-unit) * 0.5) var(--spacing-unit);
    font-size: 0.75rem;
    min-width: auto;
    gap: 4px;
    box-shadow: none;
    white-space: nowrap;
    flex: 0 0 auto;
}
.message-actions button .material-symbols-outlined, .message-cascade-controls button .material-symbols-outlined {
    font-size: 1rem;
}
.message-cascade-controls .cascade-indicator {
    font-size: 0.8rem;
    color: var(--text-secondary);
    padding: 0 var(--spacing-unit);
    white-space: nowrap;
    font-weight: 500;
}
.message-cascade-controls .cascade-delete-btn {
    background-color: var(--bg-button-delete);
    color: var(--text-light);
}
body.dark-mode .message-cascade-controls .cascade-delete-btn {
    color: var(--text-primary);
}
.message-cascade-controls .cascade-delete-btn:hover {
    background-color: var(--bg-button-delete-hover);
}
.message.retrying-hidden {
    display: none !important;
}

/* --- Chat Input Area --- */
.chat-input-area {
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
    border-top: 1px solid var(--border-primary);
    background-color: var(--bg-primary);
    flex-shrink: 0;
    gap: var(--spacing-unit);
}
.chat-input-area textarea {
    flex-grow: 1;
    min-height: 44px;
    max-height: 150px;
    height: 44px;
    resize: none;
    margin-bottom: 0;
    padding: 10px;
    border-radius: var(--border-radius-lg);
}
.chat-input-area button {
    height: 44px;
    width: 44px;
    padding: 0;
    font-size: 24px;
    flex-shrink: 0;
    border-radius: 50%;
}

body.dark-mode #attach-file-btn {
    color: var(--text-primary);
}
#send-button.sending {
    background-color: #ffc107;
    color: #333;
}

/* --- History Screen --- */
.history-list {
    list-style: none;
    padding: 0;
}
.history-item {
    padding: calc(var(--spacing-unit) * 2);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-unit);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-duration) var(--transition-timing), box-shadow var(--transition-duration) var(--transition-timing);
    cursor: pointer;
    box-shadow: var(--shadow-1);
}
.history-item:hover {
    background-color: var(--bg-tertiary);
    box-shadow: var(--shadow-2);
}
.history-item-actions button {
    padding: var(--spacing-unit);
    min-width: auto;
    border-radius: 50%;
    box-shadow: none;
}
.history-item-actions button .material-symbols-outlined { font-size: 1.25rem; }

/* --- Settings Screen --- */
.settings-group {
    margin-bottom: calc(var(--spacing-unit) * 3);
    padding: calc(var(--spacing-unit) * 2);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-1);
}
.settings-group h3 {
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-primary);
    padding-bottom: var(--spacing-unit);
}

/* --- Custom Dialog Styles (Alert, Confirm, Prompt) --- */
.custom-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: none;
    border-radius: var(--border-radius-md);
    padding: calc(var(--spacing-unit) * 3);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-5);
    min-width: 300px;
    max-width: calc(100vw - 32px);
    width: auto;
    box-sizing: border-box;
    z-index: 100;
}
.custom-dialog::backdrop {
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}
.custom-dialog[open] {
    animation: dialog-fade-in 0.2s ease-out;
}
@keyframes dialog-fade-in {
    from { opacity: 0; transform: translate(-50%, -45%); }
    to { opacity: 1; transform: translate(-50%, -50%); }
}
.custom-dialog .dialog-message {
    margin: 0 0 20px 0;
    font-size: 1rem;
    line-height: 1.6;
}
.custom-dialog .dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-unit);
    margin-top: calc(var(--spacing-unit) * 2);
}

/* --- Other Styles --- */
.danger-zone {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid var(--border-danger);
}
.danger-zone button { width: 100%; }
#update-app-btn { background-color: var(--bg-button-update); }
#update-app-btn:hover { background-color: var(--bg-button-update-hover); }
#clear-data-btn { background-color: var(--bg-button-delete); }
#clear-data-btn:hover { background-color: var(--bg-button-delete-hover); }

.param-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 15px; }
.image-upload-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.background-thumbnail { max-width: 100px; max-height: 60px; border-radius: 4px; border: 1px solid var(--border-tertiary); object-fit: cover; }
.message-content img { max-width: 100%; height: auto; border-radius: var(--border-radius-md); cursor: pointer; }
#image-modal-overlay { background-color: rgba(0, 0, 0, 0.85); }
.citation-details, .function-call-details { margin-top: var(--spacing-unit); font-size: 0.8rem; border-top: 1px dashed var(--border-secondary); padding-top: var(--spacing-unit); }
.message-edit-area { margin-top: 5px; }
.message-edit-area textarea { min-height: 60px; margin-bottom: 5px; width: 100%; }
.message-edit-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 5px; }
.message-edit-actions button { padding: 4px 10px; font-size: 12px; }
.message-edit-actions .save-edit-btn { background-color: var(--bg-button-save); }
.message-edit-actions .save-edit-btn:hover { background-color: var(--bg-button-save-hover); }
.message-edit-actions .cancel-edit-btn { background-color: var(--bg-button-cancel); }
.message-edit-actions .cancel-edit-btn:hover { background-color: var(--bg-button-cancel-hover); }
.chat-input-area button#attach-file-btn.has-attachments .attachment-badge { display: block; }
#loading-indicator { position: fixed; bottom: 70px; right: 20px; background-color: var(--bg-tertiary); color: var(--text-secondary); padding: 6px 12px; border-radius: 15px; font-size: 11px; z-index: 3; box-shadow: var(--shadow-2); transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease; opacity: 0; visibility: hidden; transform: translateY(10px); pointer-events: none; }
#loading-indicator:not(.hidden) { opacity: 1; visibility: visible; transform: translateY(0); }
.history-item-details { overflow: hidden; min-width: 0; width: 100%; margin-bottom: 8px; }
.history-item-title { font-size: 15px; font-weight: bold; margin-bottom: 0px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; display: block; color: var(--text-primary); }
.history-item-bottom-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.history-item-dates { font-size: 9px; color: var(--text-secondary); flex-shrink: 0; line-height: 1.3; text-align: left; }
.history-item-dates span { display: block; white-space: nowrap; }
.history-item-actions { display: flex; gap: 8px; flex-shrink: 0; flex-wrap: nowrap; cursor: default; }
.js-history-item-template { display: none !important; }
#no-history-message { text-align: center; color: var(--text-secondary); margin-top: 20px; }
.checkbox-label { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; cursor: pointer; color: var(--text-primary); }
.checkbox-label input[type="checkbox"] { width: auto; margin-bottom: 0; cursor: pointer; }
.settings-slider-container { margin-top: 15px; }
.settings-slider-container label { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 8px; background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: 5px; outline: none; padding: 0; margin: 0; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 20px; height: 20px; background: var(--bg-button); cursor: pointer; border-radius: 50%; border: 2px solid var(--bg-primary); }
input[type="range"]::-moz-range-thumb { width: 18px; height: 18px; background: var(--bg-button); cursor: pointer; border-radius: 50%; border: 2px solid var(--bg-primary); }
.settings-color-picker-container { display: flex; align-items: center; gap: 10px; margin-top: 15px; }
.settings-color-picker-container label { margin-bottom: 0; flex-shrink: 0; }
input[type="color"] { -webkit-appearance: none; appearance: none; width: 40px; height: 30px; padding: 0; border: none; background: none; cursor: pointer; margin-bottom: 0; }
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: 1px solid var(--border-primary); border-radius: 4px; }
input[type="color"]::-moz-color-swatch { border: 1px solid var(--border-primary); border-radius: 4px; }
.settings-reset-button { background-color: var(--bg-button-action); color: var(--text-light); padding: 4px 10px; font-size: 12px; border-radius: 4px; margin-left: auto; }
.settings-reset-button:hover { background-color: var(--bg-button-action-hover); }
.message-content > *:first-child { margin-top: 0; }
.message-content > *:last-child { margin-bottom: 0; }
.message-content h1, .message-content h2, .message-content h3, .message-content h4, .message-content h5, .message-content h6 { margin-top: 1.2em; margin-bottom: 0.6em; font-weight: bold; line-height: 1.3; color: inherit; }
.message-content p { margin-bottom: 0.8em; }
.message-content ul, .message-content ol { margin-bottom: 0.8em; padding-left: 2em; }
.message-content li { margin-bottom: 0.3em; }
.message-content pre { background-color: var(--bg-secondary); padding: 10px; border-radius: 5px; overflow-x: auto; margin: 1em 0; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 13px; border: 1px solid var(--border-tertiary); color: var(--text-secondary); }
.message.user .message-content pre { background-color: transparent; padding: 0; margin: 0; border: none; border-radius: 0; color: inherit; font-family: inherit; font-size: inherit; line-height: inherit; white-space: pre-wrap; word-wrap: break-word; overflow-x: visible; }
.message-content code:not(pre > code) { background-color: var(--bg-secondary); padding: 0.2em 0.4em; border-radius: 3px; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 0.9em; border: 1px solid var(--border-tertiary); color: var(--text-secondary); }
.message-content blockquote { margin: 1em 0; padding-left: 1em; border-left: 4px solid var(--border-primary); color: var(--text-secondary); }
.message-content a { color: var(--text-link); text-decoration: underline; }
.message-content table { border-collapse: collapse; margin: 1em 0; width: auto; border: 1px solid var(--border-secondary); }
.message-content th, .message-content td { border: 1px solid var(--border-secondary); padding: 6px 10px; text-align: left; }
.message-content th { background-color: var(--bg-tertiary); font-weight: bold; }
.message-content hr { border: none; border-top: 1px solid var(--border-secondary); margin: 1.5em 0; }
.message.editing.show-actions .message-actions, .message.editing.show-actions .message-cascade-controls { display: none !important; }
.message-actions .token-count-display { font-size: 0.8rem; color: var(--text-secondary); vertical-align: middle; line-height: 1.5; white-space: nowrap; }
.thought-summary-details { margin-bottom: 10px; font-size: 13px; border: 1px solid var(--border-tertiary); border-radius: 5px; background-color: var(--bg-tertiary); }
.thought-summary-details summary { cursor: pointer; font-weight: 500; color: var(--text-secondary); list-style: none; padding: 6px 10px; outline: none; display: flex; align-items: center; gap: 5px; user-select: none; }
.thought-summary-details summary::before { content: '🧠'; font-size: 14px; display: inline-block; }
.thought-summary-details[open] summary { border-bottom: 1px solid var(--border-tertiary); }
.thought-summary-content { padding: 8px 10px; font-size: 13px; line-height: 1.5; color: var(--text-primary); word-wrap: break-word; }
.attachment-details { margin-top: 10px; font-size: 12px; border: 1px solid var(--border-attachment-details); border-radius: 5px; background-color: var(--bg-attachment-details); }
.attachment-details summary { cursor: pointer; font-weight: normal; color: var(--text-attachment-summary); list-style: none; padding: 5px 10px; outline: none; display: flex; align-items: center; gap: 5px; }
.attachment-details summary::before { content: '📎'; font-size: 14px; display: inline-block; }
.attachment-details[open] summary { border-bottom: 1px solid var(--border-attachment-details); }
.attachment-list { list-style: none; padding: 8px 10px 5px 10px; margin: 0; }
.attachment-list li { margin-bottom: 4px; font-size: 10px; color: var(--text-attachment-filename); overflow-wrap: break-word; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.4; }
#fileUploadDialog { min-width: 320px; max-width: 600px; width: 90%; }
.dialog-content { margin-bottom: 20px; }
.file-upload-area { margin-bottom: 15px; text-align: center; }
.file-upload-area .dialog-button {
    /* ボタンらしい見た目を再現するためのスタイル */
    display: inline-block; /* 中央揃えとpaddingを正しく適用するため */
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    color: var(--text-light);
    background-color: var(--bg-button);
    border: none;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-1);
    cursor: pointer;
    text-align: center;
    user-select: none; /* テキスト選択を防止 */
    -webkit-tap-highlight-color: transparent; /* モバイルでのタップ時のハイライトを無効化 */
    transition: background-color var(--transition-duration) var(--transition-timing), box-shadow var(--transition-duration) var(--transition-timing);
}

/* ホバー時のスタイルも追加 */
.file-upload-area .dialog-button:hover {
    background-color: var(--bg-button-hover);
    box-shadow: var(--shadow-2);
}
#selected-files-list { list-style: none; padding: 0; margin: 0; max-height: 200px; overflow-y: auto; border: 1px solid var(--border-secondary); border-radius: 5px; background-color: var(--bg-secondary); }
.selected-file-item { display: flex; justify-content: space-between; align-items: center; padding: 8px 12px; border-bottom: 1px solid var(--border-tertiary); background-color: var(--bg-tertiary); }
.selected-file-item:last-child { border-bottom: none; }
.selected-file-info { flex-grow: 1; overflow: hidden; margin-right: 10px; }
.selected-file-name { display: block; font-size: 14px; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.selected-file-size { display: block; font-size: 11px; color: var(--text-secondary); }
.remove-file-btn { background-color: var(--bg-button-delete); color: var(--text-light); border: none; border-radius: 15%; width: 22px; height: 22px; min-width: 0 !important; font-size: 14px; line-height: 1; padding: 0; cursor: pointer; flex-shrink: 0; display: flex; justify-content: center; align-items: center; }
#file-upload-notice { font-size: 11px; color: var(--text-secondary); margin-top: 10px; text-align: center; }

/* --- Animations & Effects --- */
@keyframes pop-in {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}
.message:nth-last-child(-n+2) {
    animation: pop-in 0.3s var(--transition-timing) forwards;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}
.ripple {
    position: absolute;
    border-radius: 50%;
    transform: scale(0);
    animation: ripple 0.6s linear;
    background-color: rgba(255, 255, 255, 0.7);
}
body.dark-mode .ripple {
    background-color: rgba(0, 0, 0, 0.7);
}

/* --- Message Actions --- */
.message-actions, .message-cascade-controls {
    position: absolute;
    display: none;
    flex-wrap: nowrap;
    gap: var(--spacing-unit);
    background: var(--bg-message-actions);
    padding: var(--spacing-unit);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-2);
    z-index: 2;
    transition: opacity var(--transition-duration) var(--transition-timing);
    width: max-content;
    white-space: nowrap;
}
.message-actions { bottom: calc(-1 * var(--spacing-unit) * 5.5); }
.message-cascade-controls {
    top: calc(-1 * var(--spacing-unit) * 5.5);
    left: 0;
    align-items: center;
}
.message:hover .message-actions,
.message.show-actions .message-actions { display: flex; }

.message.model:hover .message-cascade-controls,
.message.model.show-actions .message-cascade-controls { display: flex; }

.message.user .message-actions { right: 0; }
.message.model .message-actions { left: 0; }

.message-actions button, .message-cascade-controls button {
    padding: calc(var(--spacing-unit) * 0.5) var(--spacing-unit);
    font-size: 0.75rem;
    min-width: auto;
    gap: 4px;
    box-shadow: none;
    white-space: nowrap;
    flex: 0 0 auto;
}
.message-actions button .material-symbols-outlined, .message-cascade-controls button .material-symbols-outlined {
    font-size: 1rem;
}
.message-cascade-controls .cascade-indicator {
    font-size: 0.8rem;
    color: var(--text-secondary);
    padding: 0 var(--spacing-unit);
    white-space: nowrap;
    font-weight: 500;
}
.message-cascade-controls .cascade-delete-btn {
    background-color: var(--bg-button-delete);
    color: var(--text-light);
}
body.dark-mode .message-cascade-controls .cascade-delete-btn {
    color: var(--text-primary);
}
.message-cascade-controls .cascade-delete-btn:hover {
    background-color: var(--bg-button-delete-hover);
}
.message.retrying-hidden {
    display: none !important;
}
/* --- Layered Image Display --- */
.layered-image-container {
    position: relative;
    display: block;
    overflow: hidden;
    border-radius: var(--border-radius-md);
    background-color: var(--bg-tertiary);
    max-width: 80%;
    margin: var(--spacing-unit) auto;
    cursor: pointer; /* クリック可能であることを示す */
    /* aspect-ratio はJavaScriptによって動的に設定されます */
}

.layered-background-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    z-index: 1;
}

.layered-character-image {
    position: relative; /* 背景の上に重なるように */
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    z-index: 2;
}

.layered-image-error {
    padding: var(--spacing-unit);
    color: var(--text-error);
    background-color: var(--bg-error-message);
    border: 1px solid var(--border-danger);
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
    text-align: center;
}

.thought-summary-details {
    margin-bottom: 10px;
    font-size: 13px;
    border: 1px solid var(--border-tertiary);
    border-radius: 5px;
    background-color: var(--bg-tertiary);
}
.thought-summary-details summary {
    cursor: pointer;
    font-weight: 500;
    color: var(--text-secondary);
    list-style: none;
    padding: 6px 10px;
    outline: none;
    display: flex;
    align-items: center;
    gap: 5px;
    user-select: none;
}
.thought-summary-details summary::before {
    content: '🧠';
    font-size: 14px;
    display: inline-block;
}
.thought-summary-details {
    margin-bottom: 10px;
    font-size: 13px;
    border: 1px solid var(--border-tertiary);
    border-radius: 5px;
    background-color: var(--bg-secondary);
}

.thought-summary-content ul,
.thought-summary-content ol {
    padding-left: 2em; 
}

.thought-summary-content {
    padding: 8px 10px;
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-primary);
    word-wrap: break-word;
}

.thought-summary-content {
    padding: 8px 10px;
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-primary);
    word-wrap: break-word;
}

/* --- Prism.js Custom Overrides --- */
.message-content pre[class*="language-"],
.message-content pre[class*="language-"] code {
    white-space: pre-wrap;
    word-break: break-all;
}

/* --- Drag and Drop Styles --- */
#chat-screen.drag-over::after {
    content: 'ここにファイルをドロップ';
    position: absolute;
    inset: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-light);
    background-color: rgba(0, 0, 0, 0.5);
    border: 3px dashed var(--bg-button);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-unit);
    z-index: 100;
    pointer-events: none; /* After要素がイベントを奪わないように */
}

body.dark-mode #chat-screen.drag-over::after {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.5);
}

/* --- Attachment Button Badge Fix --- */
#attach-file-btn {
    position: relative;
    background-color: transparent;
    color: var(--text-secondary);
    box-shadow: none;
    display: grid; /* Gridレイアウトで重ね合わせる */
    place-items: center;
    overflow: visible; /* バッジがはみ出せるように */
}

#attach-file-btn .attach-icon-container,
#attach-file-btn .attach-badge-container {
    grid-area: 1 / 1; /* アイコンとバッジを同じセルに配置 */
}

#attach-file-btn .attach-icon-container {
    z-index: 1; /* アイコンを奥に */
}

#attach-file-btn .attach-badge-container {
    z-index: 2; /* バッジコンテナを手前に */
    width: 100%;
    height: 100%;
    position: relative; /* バッジの配置基準 */
}

.attachment-badge {
    position: absolute;
    top: 5px;   /* 位置を微調整 */
    right: 5px; /* 位置を微調整 */
    width: var(--badge-size);
    height: var(--badge-size);
    background-color: var(--badge-color);
    border-radius: 50%;
    border: 1px solid var(--bg-primary);
    display: none;
}

/* 既存の表示切り替えルールはそのまま利用 */
.chat-input-area button#attach-file-btn.has-attachments .attachment-badge {
    display: block;
}

/* --- Function Call & Search Results Details --- */
.function-call-details {
    margin-top: var(--spacing-unit);
    font-size: 0.8rem;
    border-top: 1px dashed var(--border-secondary); /* 上部に点線の区切り */
    padding-top: var(--spacing-unit);
}
.function-call-details summary {
    cursor: pointer;
    font-weight: 500;
    color: var(--text-secondary);
    list-style: none;
    padding: 0 0 4px 0; /* 下方向の余白を少し確保 */
    outline: none;
    display: flex;
    align-items: center;
    gap: 5px;
    user-select: none;
}
.function-call-details[open] summary {
    margin-bottom: 6px; /* 展開時にリストとの間に少し余白 */
}
.function-call-list {
    padding-left: 25px; /* リストのインデント */
    margin: 0;
    font-size: 0.8rem;
    line-height: 1.6;
}
.function-call-list li {
    margin-bottom: 4px;
}

/* --- 連続するツールブロックの区切り線を消す --- */
.function-call-details + .function-call-details {
    border-top: none;
    padding-top: 0;
    margin-top: calc(var(--spacing-unit) / 2); /* 連続する場合のブロック間の余白を少し詰める */
}

/* --- Image Modal Styles --- */
#image-modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.85);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

#image-modal-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-5);
}

#image-modal-close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 30px;
    color: white;
    cursor: pointer;
    font-weight: bold;
    line-height: 1;
    text-shadow: 0 0 5px black;
}

/* --- Profile Card Styles (Header) --- */
.app-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
}
.app-header h1#chat-title {
    margin: 0;
    margin-right: auto;
    font-size: 1.1rem;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-grow: 1;
    min-width: 50px;
}
.profile-card-wrapper {
    position: relative;
    flex-shrink: 0;
}
.app-header .profile-card {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color var(--transition-duration) var(--transition-timing);
    max-width: 180px;
    background-color: rgba(255, 255, 255, 0.1); 
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.app-header .profile-card:hover {
    background-color: rgba(255, 255, 255, 0.2);
}
.profile-icon-container {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.3);
    overflow: hidden;
}

.profile-icon-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.profile-icon-container .material-symbols-outlined {
    font-size: 24px;
    color: var(--text-light);
}
.profile-card-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-light);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 4px;
}
.profile-card-arrow {
    font-size: 20px;
    color: var(--text-light);
}
.app-header .header-button,
.app-header .new-chat-button {
    flex-shrink: 0;
}

/* --- Profile Menu (Dropdown) --- */
.app-header .profile-menu,
#settings-screen .profile-menu {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-3);
    z-index: 100;
    overflow: hidden;
    min-width: 180px;
    border: 1px solid var(--border-primary);
}
.profile-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    cursor: pointer;
    transition: background-color var(--transition-duration) var(--transition-timing);
    color: var(--text-primary);
    font-size: 0.9rem;
}
.profile-menu-item:hover {
    background-color: var(--bg-tertiary);
}
.profile-menu-item.active {
    font-weight: 700;
    background-color: var(--bg-secondary);
}
.profile-menu-item .profile-icon-container {
    width: 24px;
    height: 24px;
}
.profile-menu-item .material-symbols-outlined {
    font-size: 20px;
}

/* --- Profile Management Styles (Settings Screen) --- */
#profile-management-group {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    padding-bottom: 12px;
}

#profile-management-group h3 {
    display: none;
}

.profile-display-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background-color: var(--bg-tertiary);
    padding: 12px 16px;
    border-radius: var(--border-radius-lg);
    margin-bottom: 16px;
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-1);
}
.profile-display-icon-wrapper {
    position: relative;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    flex-shrink: 0;
}
.profile-display-icon-wrapper label {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    overflow: hidden;
    background-color: var(--bg-secondary);
    cursor: pointer;
}
.profile-display-icon-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.profile-display-icon-wrapper .default-icon-placeholder .material-symbols-outlined {
    font-size: 40px;
    color: var(--text-secondary);
}
.profile-display-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex-grow: 1;
    min-width: 0;
}
.profile-display-name-wrapper {
    display: flex;
    align-items: center;
    gap: 4px;
}
.profile-display-name-main {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.profile-display-name-sub {
    font-size: 0.75rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-display-status {
    display: none;
}

.icon-button {
    background: none;
    border: none;
    padding: 4px;
    box-shadow: none;
    color: var(--text-secondary);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.icon-button .material-symbols-outlined {
    font-size: 18px;
}
.icon-button:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}
.icon-button-overlay {
    position: absolute;
    top: -4px;
    right: -4px;
    background-color: var(--bg-button-delete);
    color: var(--text-light) !important;
    width: 24px;
    height: 24px;
    padding: 0;
    opacity: 0;
    transition: opacity var(--transition-duration) var(--transition-timing);
}
.profile-display-icon-wrapper:hover .icon-button-overlay {
    opacity: 1;
}
.icon-button-overlay .material-symbols-outlined {
    font-size: 16px;
}
.profile-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px;
    margin-top: 0; 
    border-top: none; 
    padding-top: 0;
}
.profile-actions button {
    font-size: 0.8rem;
    padding: 8px 12px;
    justify-content: flex-start;
    background-color: var(--bg-button-action);
    color: var(--text-light);
}
.profile-actions button:hover {
    background-color: var(--bg-button-action-hover);
}
/* ダークモード時のボタン文字色を調整 */
body.dark-mode .profile-actions button {
    color: var(--text-primary);
}

/* --- Profile Management Button Color Fix --- */

/* 基本のボタンスタイル */
#profile-management-group .profile-actions button {
    background-color: var(--bg-button-action);
    color: var(--text-light);
}
#profile-management-group .profile-actions button:hover {
    background-color: var(--bg-button-action-hover);
}

/* ダークモード時のボタンスタイルを明示的に指定 */
body.dark-mode #profile-management-group .profile-actions button {
    background-color: #424242;
    color: var(--text-primary);
}
body.dark-mode #profile-management-group .profile-actions button:hover {
    background-color: #616161;
}

/* --- Footer Profile Card --- */
.chat-input-area .profile-card-wrapper {
    position: relative;
    flex-shrink: 0;
    align-self: flex-end; 
}

.chat-input-area .profile-card {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    cursor: pointer;
    transition: background-color var(--transition-duration) var(--transition-timing);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    height: 44px;
    width: 44px;
}

.chat-input-area .profile-card:hover {
    background-color: var(--border-primary);
}

.chat-input-area .profile-icon-container {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    overflow: hidden;
}

.chat-input-area .profile-icon-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.chat-input-area .profile-icon-container .material-symbols-outlined {
    font-size: 28px;
    color: var(--text-secondary);
}

/* --- Footer Dropdown Menu Position --- */
.chat-input-area .profile-menu {
    position: absolute;
    bottom: calc(100% + 4px);
    left: 0;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-3);
    z-index: 100;
    overflow: hidden;
    min-width: 200px;
    border: 1px solid var(--border-primary);
}

/* --- Profile Menu Item Layout --- */
.profile-menu-item {
    gap: 10px;
    padding: 8px 12px;
}

.profile-menu-text-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden; 
}

.profile-menu-name {
    font-size: 0.85rem; 
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-menu-model {
    font-size: 0.7rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-menu-item.active .profile-menu-name {
    font-weight: 700;
}

/* --- Profile Actions Note --- */
.profile-actions-note {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-align: right;
    margin-top: 8px;
    line-height: 1.4;
}

.profile-actions-note a {
    color: var(--text-link);
    text-decoration: none;
}

.profile-actions-note a:hover {
    text-decoration: underline;
}

/* --- Empty Model Bubble Fix --- */
.message.model:not(:has(.thought-summary-details)):has(.message-content:empty) {
    padding: 0;
    margin: 0;
    border: none;
    box-shadow: none;
    min-height: 20px; /* 瞬時に表示される際のレイアウトシフトを最小限に抑えるための高さ確保 */
    background-color: transparent;
}

#chat-screen { transform: translateX(0); }
#history-screen { transform: translateX(-100%); }
#settings-screen { transform: translateX(100%); }

/* --- Lazy Load Image Styles --- */
.lazy-load-image {
    background-color: var(--bg-tertiary);
    min-height: 100px; /* 読み込み中の高さを確保 */
    display: block;
    border-radius: var(--border-radius-md);
    margin-top: 8px;
    transition: opacity 0.3s ease-in-out;
    opacity: 0.5;
}

.lazy-load-image[src] {
    min-height: auto; /* 読み込み後は高さを自動に */
    background-color: transparent;
    opacity: 1;
}

.lazy-load-image.load-error {
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-error);
    border: 1px dashed var(--border-danger);
}
/* --- App Update Notification --- */
.update-notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-3);
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 1000;
    animation: slide-up 0.5s ease-out forwards;
}

.update-notification.hidden {
    display: none;
}

@keyframes slide-up {
    from {
        transform: translate(-50%, 100px);
        opacity: 0;
    }
    to {
        transform: translateX(-50%);
        opacity: 1;
    }
}

#reload-for-update-btn {
    padding: 6px 16px;
    font-size: 0.8rem;
    background-color: var(--bg-button-update);
    color: var(--text-light);
    box-shadow: none;
}
body.dark-mode #reload-for-update-btn {
    color: var(--text-primary);
}