/**
 * AI Subscription - Frontend Chat UI
 *
 * Scoped under .ai-sub-app to avoid WordPress theme conflicts.
 * Uses CSS variables for light/dark theme support.
 *
 * @package AI_Subscription
 * @since   1.0.0
 */

/* ===================== CSS VARIABLES ===================== */
.ai-sub-app {
    --font-main: inherit;
    --font-mono: monospace;
    --sidebar-width: 280px;
    --sidebar-collapsed: 0px;
    --header-height: 52px;
    --transition-speed: 0.3s;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
}

/* Light Theme (default) */
.ai-sub-app,
.ai-sub-app[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f7f7f8;
    --bg-tertiary: #ececee;
    --bg-sidebar: #f9f9fa;
    --bg-input: #ffffff;
    --bg-hover: #f0f0f2;
    --bg-active: #e8e8ec;
    --bg-suggestion: #ffffff;
    --bg-overlay: rgba(0,0,0,0.3);
    --text-primary: #1a1a1a;
    --text-secondary: #6b6b78;
    --text-tertiary: #9b9ba8;
    --text-placeholder: #b0b0bc;
    --border-light: #e5e5ea;
    --border-medium: #d5d5dc;
    --border-input: #d8d8e0;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-subtle: rgba(37, 99, 235, 0.08);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
    --shadow-input: 0 2px 8px rgba(0,0,0,0.06);
    --scrollbar-thumb: #c8c8d0;
    --scrollbar-track: transparent;
    --date-label: #9b6b2a;
    --new-chat-bg: #f0f0f2;
    --new-chat-text: #1a1a1a;
    --search-bg: #f0f0f2;
}

/* Dark Theme */
.ai-sub-app[data-theme="dark"] {
    --bg-primary: #2b2b30;
    --bg-secondary: #383840;
    --bg-tertiary: #4a4a52;
    --bg-sidebar: #252529;
    --bg-input: #383840;
    --bg-hover: #424249;
    --bg-active: #4e4e56;
    --bg-suggestion: #383840;
    --bg-overlay: rgba(0,0,0,0.5);
    --text-primary: #f5f5f7;
    --text-secondary: #c8c8d0;
    --text-tertiary: #9a9aa6;
    --text-placeholder: #7e7e8a;
    --border-light: #4a4a52;
    --border-medium: #5a5a62;
    --border-input: #505058;
    --accent: #6b9bff;
    --accent-hover: #88b0ff;
    --accent-subtle: rgba(107, 155, 255, 0.14);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.25);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.35);
    --shadow-input: 0 2px 8px rgba(0,0,0,0.2);
    --scrollbar-thumb: #5a5a62;
    --scrollbar-track: transparent;
    --date-label: #6b9bff;
    --new-chat-bg: #4a4a52;
    --new-chat-text: #f0f0f3;
    --search-bg: #333339;
}

/* Theme transition — applied temporarily during light/dark switch */
.ai-sub-app.theme-transitioning,
.ai-sub-app.theme-transitioning *,
.ai-sub-app.theme-transitioning *::before,
.ai-sub-app.theme-transitioning *::after {
    transition:
        background var(--transition-speed) ease,
        background-color var(--transition-speed) ease,
        color var(--transition-speed) ease,
        border-color var(--transition-speed) ease,
        box-shadow var(--transition-speed) ease,
        fill var(--transition-speed) ease,
        stroke var(--transition-speed) ease
        !important;
}

/* ===================== TRANSPARENT BACKGROUND (add-on) ===================== */
/* Chat background — main area + input area */
.ai-sub-app.transparent-bg {
    background: transparent;
}

.ai-sub-app.transparent-bg .input-area {
    background: transparent;
}

/* Top bar — fully transparent */
.ai-sub-app.transparent-topbar .top-bar {
    background: transparent;
}

/* ===================== RESET (scoped) ===================== */
.ai-sub-app,
.ai-sub-app *,
.ai-sub-app *::before,
.ai-sub-app *::after {
    box-sizing: border-box;
}

.ai-sub-app button,
.ai-sub-app input,
.ai-sub-app textarea {
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

.ai-sub-app button:focus,
.ai-sub-app button:active {
    background-color: inherit;
    color: inherit;
}

.ai-sub-app {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    max-height: 100vh;
    width: 100%;
    overflow: hidden;
    position: relative;
    margin: 0;
    padding: 0;
    line-height: 1.5;
    font-size: 15px;
    display: flex;
    flex-direction: column;
}

/* ===================== LAYOUT ===================== */
.ai-sub-app .app-layout {
    display: flex;
    flex: 1;
    min-height: 0;
    position: relative;
}

/* ===================== SIDEBAR ===================== */
.ai-sub-app .sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-speed) ease, min-width var(--transition-speed) ease, transform var(--transition-speed) ease;
    overflow: hidden;
    z-index: 100;
}

.ai-sub-app .sidebar.collapsed {
    width: 0;
    min-width: 0;
    border-right: none;
}

.ai-sub-app .sidebar-header {
    padding: 14px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-light);
    min-height: var(--header-height);
    gap: 8px;
    flex-shrink: 0;
}

.ai-sub-app .sidebar-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 16px;
    letter-spacing: -0.02em;
    white-space: nowrap;
    overflow: hidden;
    min-width: 0;
}

.ai-sub-app .sidebar-logo {
    width: 24px;
    height: 24px;
    object-fit: contain;
    flex-shrink: 0;
    border-radius: 4px;
}

.ai-sub-app .sidebar-header-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.ai-sub-app .sidebar-header-actions .icon-btn {
    width: 32px;
    height: 32px;
}

/* Search */
.ai-sub-app .sidebar-search {
    padding: 12px 14px;
    flex-shrink: 0;
}

.ai-sub-app .search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.ai-sub-app .search-input-wrapper svg {
    position: absolute;
    left: 10px;
    color: var(--text-tertiary);
    width: 15px;
    height: 15px;
    pointer-events: none;
}

.ai-sub-app .search-input {
    width: 100%;
    padding: 8px 10px 8px 32px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    background: var(--search-bg);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.ai-sub-app .search-input::placeholder {
    color: var(--text-placeholder);
}

.ai-sub-app .search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

/* New Chat Button */
.ai-sub-app .new-chat-btn {
    margin: 0 14px 10px;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--new-chat-bg);
    color: var(--new-chat-text);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    font-family: var(--font-main);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
    flex-shrink: 0;
}

.ai-sub-app .new-chat-btn:hover {
    background: var(--bg-hover);
    box-shadow: var(--shadow-sm);
}

/* Conversation List */
.ai-sub-app .conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 10px 14px;
}

.ai-sub-app .conversation-group {
    margin-bottom: 6px;
}

.ai-sub-app .conversation-group-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--date-label);
    padding: 10px 8px 6px;
    white-space: nowrap;
}

.ai-sub-app .conversation-item {
    display: flex;
    align-items: center;
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s;
    gap: 8px;
    position: relative;
}

.ai-sub-app .conversation-item:hover {
    background: var(--bg-hover);
}

.ai-sub-app .conversation-item.active {
    background: var(--bg-active);
}

.ai-sub-app .conversation-item-text {
    flex: 1;
    font-size: 13.5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
    line-height: 1.3;
}

/* Shared state indicator on share buttons */
.ai-sub-app .icon-btn.is-shared,
.ai-sub-app .icon-btn.is-shared:hover {
    color: var(--accent);
}

.ai-sub-app .conversation-item-actions {
    display: none;
    gap: 2px;
    flex-shrink: 0;
}

.ai-sub-app .conversation-item:hover .conversation-item-actions {
    display: flex;
}

.ai-sub-app .conversation-item-actions .icon-btn {
    width: 24px;
    height: 17px;
}

.ai-sub-app .conversation-item-actions .icon-btn svg {
    width: 17px;
    height: 17px;
}

.ai-sub-app .conversation-item-rename {
    flex: 1;
    font-size: 13.5px;
    font-family: var(--font-main);
    padding: 2px 6px;
    border: 1.5px solid var(--accent);
    border-radius: 4px;
    background: var(--bg-input);
    color: var(--text-primary);
    outline: none;
    min-width: 0;
    box-shadow: 0 0 0 3px var(--accent-subtle);
}


/* ===================== MAIN AREA ===================== */
.ai-sub-app .main-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    position: relative;
    overflow-y: auto;
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
}

/* Top bar */
.ai-sub-app .top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    min-height: var(--header-height);
    flex-shrink: 0;
    gap: 8px;
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--bg-primary);
}

.ai-sub-app .top-bar-left {
    display: flex;
    align-items: center;
    gap: 6px;
}

.ai-sub-app .top-bar-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Icon Buttons */
.ai-sub-app .icon-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s;
    position: relative;
    flex-shrink: 0;
    padding: 0;
    margin: 0;
}

.ai-sub-app .icon-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.ai-sub-app .icon-btn svg {
    width: 18px;
    height: 18px;
}

.ai-sub-app .icon-btn .tooltip {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: var(--bg-primary);
    font-size: 11px;
    padding: 4px 8px;
    border-radius: 6px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s;
    z-index: 99;
}

.ai-sub-app .icon-btn:hover .tooltip {
    opacity: 1;
}

/* Theme toggle */
.ai-sub-app .theme-toggle {
    width: 36px;
    height: 36px;
}

/* Light mode (default): show moon, hide sun */
.ai-sub-app .sun-icon { display: none; }
.ai-sub-app .moon-icon { display: block; }

/* Dark mode: show sun, hide moon */
.ai-sub-app[data-theme="dark"] .sun-icon { display: block; }
.ai-sub-app[data-theme="dark"] .moon-icon { display: none; }


/* ===================== SCROLLBAR ===================== */

/* Main area: always visible (Firefox) */
.ai-sub-app .main-area {
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) transparent;
}

/* Main area: always visible (Webkit) */
.ai-sub-app .main-area::-webkit-scrollbar {
    width: 6px;
    background: transparent;
}

.ai-sub-app .main-area::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 100px;
}

/* Other scrollables: hidden by default (Firefox) */
.ai-sub-app .conversation-list,
.ai-sub-app .user-settings-quotas,
.ai-sub-app .input-top textarea {
    scrollbar-width: none;
    scrollbar-color: var(--scrollbar-thumb) transparent;
}

/* Other scrollables: thin on hover (Firefox) */
.ai-sub-app .conversation-list:hover,
.ai-sub-app .user-settings-quotas:hover,
.ai-sub-app .input-top textarea:hover {
    scrollbar-width: thin;
}

/* Other scrollables: hidden by default (Webkit) */
.ai-sub-app .conversation-list::-webkit-scrollbar,
.ai-sub-app .user-settings-quotas::-webkit-scrollbar,
.ai-sub-app .input-top textarea::-webkit-scrollbar {
    width: 6px;
    background: transparent;
}

.ai-sub-app .conversation-list::-webkit-scrollbar-thumb,
.ai-sub-app .user-settings-quotas::-webkit-scrollbar-thumb,
.ai-sub-app .input-top textarea::-webkit-scrollbar-thumb {
    background: transparent;
    border-radius: 100px;
}

/* Other scrollables: visible on hover (Webkit) */
.ai-sub-app .conversation-list:hover::-webkit-scrollbar-thumb,
.ai-sub-app .user-settings-quotas:hover::-webkit-scrollbar-thumb,
.ai-sub-app .input-top textarea:hover::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
}

/* ===================== CHAT AREA ===================== */
.ai-sub-app .chat-area {
    flex: 1 0 auto;
    display: flex;
    flex-direction: column;
    padding: 0 16px;
}

/* Welcome / Empty State */
.ai-sub-app .welcome-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    max-width: 720px;
    margin: 0 auto;
    width: 100%;
    padding: 40px 20px;
    text-align: left;
}

.ai-sub-app .welcome-text {
    width: 100%;
    margin-bottom: auto;
    padding-top: 40px;
}

.ai-sub-app .welcome-text h1 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: 0;
    color: var(--text-primary);
}

/* Messages */
.ai-sub-app .messages-container {
    max-width: 720px;
    margin: 0 auto;
    width: 100%;
    padding: 24px 0;
    display: none;
    flex-direction: column;
    gap: 24px;
}

.ai-sub-app .messages-container.active {
    display: flex;
}

.ai-sub-app .message {
    display: flex;
    gap: 14px;
    animation: aiSubMessageIn 0.3s ease;
}

.ai-sub-app .message .msg-copy-btn {
    display: block;
    margin-top: 4px;
    padding: 2px;
    background: none;
    color: var(--text-tertiary);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.15s;
    line-height: 0;
}

.ai-sub-app .message:hover .msg-copy-btn,
.ai-sub-app .message .msg-copy-btn.copied {
    opacity: 1;
}

.ai-sub-app .message .msg-copy-btn:hover {
    color: var(--text-primary);
}

@keyframes aiSubMessageIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.ai-sub-app .message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 13px;
    flex-shrink: 0;
    margin-top: 2px;
}

.ai-sub-app .message.user .message-avatar {
    background: var(--accent);
    color: #fff;
}

.ai-sub-app .message.assistant .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.ai-sub-app .message .message-avatar.has-image {
    background: transparent;
    font-size: 0;
    color: transparent;
}

.ai-sub-app .message-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.ai-sub-app .message-content {
    flex: 1;
    font-size: 15px;
    line-height: 1.65;
    color: var(--text-primary);
    min-width: 0;
}

.ai-sub-app .message-content p {
    margin-bottom: 8px;
}

.ai-sub-app .message-content p:last-child {
    margin-bottom: 0;
}

/* ===================== SUGGESTIONS ===================== */
.ai-sub-app .suggestions-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    max-width: 720px;
    margin: 0 auto;
    width: 100%;
    padding-bottom: 14px;
    justify-content: center;
}

.ai-sub-app .suggestion-btn {
    flex: 1 1 calc(50% - 10px);
    min-width: 140px;
    max-width: calc(50% - 5px);
    padding: 14px 18px;
    white-space: normal;
    word-break: break-word;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background: var(--bg-suggestion);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 14px;
    font-weight: 400;
    cursor: pointer;
    text-align: center;
    transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
    line-height: 1.3;
}

.ai-sub-app .suggestion-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
    box-shadow: var(--shadow-sm);
}

/* ===================== CENTERED MODE (new conversation) ===================== */
.ai-sub-app .main-area.centered-mode {
    padding-top: var(--header-height);
    overflow-y: hidden;
    scrollbar-gutter: auto;
}

.ai-sub-app .main-area.centered-mode .top-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
}

.ai-sub-app .main-area.centered-mode .chat-area {
    flex: none;
    overflow: visible;
    margin-top: auto;
    animation: aiSubFadeIn 0.9s ease 0.2s both;
}

.ai-sub-app .main-area.centered-mode .welcome-container {
    flex: none;
    padding: 0 20px 20px;
}

.ai-sub-app .main-area.centered-mode .welcome-text {
    text-align: center;
    margin-bottom: 0;
    padding-top: 0;
}

.ai-sub-app .main-area.centered-mode .input-area {
    position: relative;
    margin-bottom: auto;
}

/* When suggestions exist, move the bottom auto-margin to suggestions */
.ai-sub-app .main-area.centered-mode:has(.suggestions-grid) .input-area {
    margin-bottom: 0;
}

.ai-sub-app .main-area.centered-mode .suggestions-grid {
    order: 1;
    margin-bottom: auto;
    opacity: 0;
    transition: opacity 0.5s ease 1s;
    padding-top: 14px;
    padding-bottom: 0;
}

.ai-sub-app .main-area.centered-mode .suggestions-grid.fade-in {
    opacity: 1;
}

/* ===================== MESSAGE COUNTER ===================== */
.ai-sub-app .message-counter {
    text-align: center;
    font-size: 12px;
    color: var(--text-tertiary);
    padding: 4px 16px;
    max-width: 752px;
    margin: 0 auto;
    width: 100%;
}

.ai-sub-app .message-counter-warning {
    color: #f59e0b;
}

.ai-sub-app .message-counter-error {
    color: #ef4444;
    font-weight: 600;
}

/* ===================== INPUT AREA ===================== */
.ai-sub-app .input-area {
    padding: 0 16px 16px;
    flex-shrink: 0;
    max-width: 752px;
    margin: 0 auto;
    width: 100%;
    position: sticky;
    bottom: 0;
    z-index: 10;
    background: var(--bg-primary);
}

.ai-sub-app .input-box {
    border: 1px solid var(--border-input);
    border-radius: var(--radius-lg);
    background: var(--bg-input);
    box-shadow: var(--shadow-input);
    overflow: visible;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.ai-sub-app .input-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle), var(--shadow-input);
}

.ai-sub-app .input-top {
    padding: 12px 14px 8px;
}

.ai-sub-app .input-top textarea {
    width: 100%;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 15px;
    line-height: 1.5;
    resize: none;
    min-height: 24px;
    max-height: 140px;
    padding: 0;
    margin: 0;
    overflow-y: auto;
    transition: height 0.15s ease;
}

.ai-sub-app .input-top textarea::placeholder {
    color: var(--text-placeholder);
}

.ai-sub-app .send-btn {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1.5px solid var(--border-medium);
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    padding: 0;
}

.ai-sub-app .send-btn:hover,
.ai-sub-app .send-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: var(--bg-primary);
}

.ai-sub-app .send-btn svg {
    width: 14px;
    height: 14px;
}

.ai-sub-app .input-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px 10px;
}

.ai-sub-app .input-bottom-left {
    display: flex;
    align-items: center;
    gap: 2px;
}

.ai-sub-app .input-bottom-right {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Model selector custom dropdown */
.ai-sub-app .model-selector-wrapper {
    position: relative;
}

.ai-sub-app .model-selector-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border: none;
    background: transparent;
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.15s;
}

.ai-sub-app .model-selector-btn:hover {
    background: var(--bg-hover);
}

.ai-sub-app .model-selector-chevron {
    transition: transform 0.2s;
    flex-shrink: 0;
}

.ai-sub-app .model-selector-wrapper.open .model-selector-chevron {
    transform: rotate(180deg);
}

.ai-sub-app .model-selector-dropdown {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 0;
    padding-bottom: 6px;
    min-width: 200px;
    z-index: 100;
}

.ai-sub-app .model-selector-wrapper.open .model-selector-dropdown {
    display: block;
}

.ai-sub-app .model-selector-dropdown-inner {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    padding: 4px;
}

.ai-sub-app .model-selector-item {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: transparent;
    font-family: var(--font-main);
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background 0.15s;
    text-align: left;
}

.ai-sub-app .model-selector-item:hover {
    background: var(--bg-hover);
}

.ai-sub-app .model-selector-item.selected {
    color: var(--accent);
    font-weight: 600;
}

/* Character counter */
.ai-sub-app .ai-char-counter {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-right: 8px;
}

.ai-sub-app .ai-char-counter.ai-char-warning {
    color: #ff9800;
}

.ai-sub-app .ai-char-counter.ai-char-error {
    color: #f44336;
    font-weight: bold;
}

/* ===================== QUOTA DISPLAY ===================== */
.ai-sub-app .quota-item {
    margin-bottom: 6px;
}

.ai-sub-app .quota-item strong {
    font-size: 12px;
    color: var(--text-secondary);
}

.ai-sub-app .quota-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    margin: 5px 0;
    overflow: hidden;
}

.ai-sub-app .quota-bar-fill {
    height: 100%;
    transition: width 0.3s;
    border-radius: 4px;
}

.ai-sub-app .quota-text {
    font-size: 11px;
    color: var(--text-tertiary);
    display: block;
}

.ai-sub-app .quota-expiry {
    font-size: 11px;
    color: var(--text-tertiary);
    display: block;
}

.ai-sub-app .quota-shop-link {
    display: inline-block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--accent);
    text-decoration: none;
    background: transparent;
    background-color: transparent;
    border: none;
    padding: 0;
    font-family: var(--font-main);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    -webkit-appearance: none;
    appearance: none;
}

.ai-sub-app .quota-shop-link:hover {
    text-decoration: underline;
    background: transparent;
}

.ai-sub-app .quota-shop-link:focus,
.ai-sub-app .quota-shop-link:active,
.ai-sub-app .quota-shop-link:focus-visible {
    outline: none;
    background: transparent;
    background-color: transparent;
    color: var(--accent);
    box-shadow: none;
}

/* ===================== USER SETTINGS DROPDOWN ===================== */
.ai-sub-app .user-settings-wrapper {
    position: relative;
}

.ai-sub-app .user-settings-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    padding-top: 6px;
    min-width: 240px;
    z-index: 100;
}

.ai-sub-app .user-settings-dropdown-inner {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.ai-sub-app .user-settings-wrapper:hover .user-settings-dropdown {
    display: block;
}

.ai-sub-app .user-settings-header {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-light);
}

.ai-sub-app .user-settings-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.ai-sub-app .user-settings-quotas {
    padding: 10px 14px;
    max-height: 200px;
    overflow-y: auto;
}

.ai-sub-app .user-settings-quotas .quota-item {
    margin-bottom: 8px;
}

.ai-sub-app .user-settings-quotas .quota-item:last-child {
    margin-bottom: 0;
}

/* Send method toggle */
.ai-sub-app .user-settings-send-method {
    padding: 10px 14px;
    border-top: 1px solid var(--border-light);
}

.ai-sub-app .send-method-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
}

.ai-sub-app .send-method-toggle input {
    display: none;
}

.ai-sub-app .send-method-slider {
    position: relative;
    width: 36px;
    height: 20px;
    background: var(--border-light);
    border-radius: 10px;
    transition: background 0.2s;
    flex-shrink: 0;
}

.ai-sub-app .send-method-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: var(--bg-primary);
    border-radius: 50%;
    transition: transform 0.2s;
}

.ai-sub-app .send-method-toggle input:checked + .send-method-slider {
    background: var(--accent);
}

.ai-sub-app .send-method-toggle input:checked + .send-method-slider::after {
    transform: translateX(16px);
}

.ai-sub-app .user-settings-footer {
    padding: 8px 14px;
    border-top: 1px solid var(--border-light);
}

.ai-sub-app .user-settings-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.15s;
}

.ai-sub-app .user-settings-link:hover {
    color: var(--accent);
}

/* ===================== TOAST NOTIFICATION ===================== */
.ai-sub-app .toast-notification {
    position: absolute;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 10px 22px;
    border-radius: var(--radius-xl);
    font-size: 13.5px;
    font-weight: 500;
    font-family: var(--font-main);
    box-shadow: var(--shadow-lg);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s, transform 0.25s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ai-sub-app .toast-notification.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===================== SHARE MODAL ===================== */
.ai-sub-app .modal-overlay {
    display: none;
    position: absolute;
    inset: 0;
    background: var(--bg-overlay);
    z-index: 200;
    align-items: center;
    justify-content: center;
    animation: aiSubFadeIn 0.2s ease;
}

.ai-sub-app .modal-overlay.visible {
    display: flex;
}

.ai-sub-app .share-modal {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 28px;
    width: 90%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    animation: aiSubModalIn 0.25s ease;
}

@keyframes aiSubModalIn {
    from { opacity: 0; transform: scale(0.95) translateY(8px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes aiSubFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}


.ai-sub-app .share-modal h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.ai-sub-app .share-modal p {
    font-size: 13.5px;
    color: var(--text-secondary);
    margin-bottom: 18px;
    line-height: 1.5;
}

.ai-sub-app .share-link-row {
    display: flex;
    gap: 8px;
    margin-bottom: 18px;
}

.ai-sub-app .share-link-input {
    flex: 1;
    padding: 9px 12px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12.5px;
    outline: none;
    min-width: 0;
}

.ai-sub-app .copy-link-btn {
    padding: 9px 16px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: opacity 0.15s;
}

.ai-sub-app .copy-link-btn:hover {
    opacity: 0.85;
}

.ai-sub-app .share-modal-loading {
    padding: 20px 0;
}

.ai-sub-app .share-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.ai-sub-app .share-close-btn {
    padding: 8px 18px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
}

.ai-sub-app .share-close-btn:hover {
    background: var(--bg-hover);
}

.ai-sub-app .share-stop-btn {
    padding: 8px 18px;
    background: #ef4444;
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.15s;
}

.ai-sub-app .share-stop-btn:hover {
    opacity: 0.85;
}

/* ===================== FAST BUY MODAL ===================== */
.ai-sub-app .fast-buy-modal {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 28px;
    width: 90%;
    max-width: 480px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    animation: aiSubModalIn 0.25s ease;
}

.ai-sub-app .fast-buy-modal h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 4px;
}

.ai-sub-app .fast-buy-modal p {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0 0 16px;
    line-height: 1.4;
}

.ai-sub-app .fast-buy-packages {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 16px;
}

.ai-sub-app .fast-buy-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    gap: 12px;
}

.ai-sub-app .fast-buy-item-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.ai-sub-app .fast-buy-item-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ai-sub-app .fast-buy-item-price {
    font-size: 12px;
    color: var(--text-secondary);
}

.ai-sub-app .fast-buy-item-btn {
    padding: 6px 14px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: opacity 0.15s;
}

.ai-sub-app .fast-buy-item-btn:hover {
    opacity: 0.85;
}

.ai-sub-app .fast-buy-modal-actions {
    display: flex;
    justify-content: flex-end;
}

.ai-sub-app .fast-buy-close-btn {
    padding: 8px 18px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}

.ai-sub-app .fast-buy-close-btn:hover {
    background: var(--bg-hover);
}

/* ===================== CONFIRM MODAL ===================== */
.ai-sub-app .confirm-modal {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 28px;
    width: 90%;
    max-width: 340px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    animation: aiSubModalIn 0.25s ease;
}

.ai-sub-app .confirm-modal p {
    font-size: 14px;
    color: var(--text-primary);
    margin: 0 0 20px;
    line-height: 1.5;
}

.ai-sub-app .confirm-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.ai-sub-app .confirm-cancel-btn {
    padding: 8px 18px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}

.ai-sub-app .confirm-cancel-btn:hover {
    background: var(--bg-hover);
}

.ai-sub-app .confirm-ok-btn {
    padding: 8px 18px;
    background: #ef4444;
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.15s;
}

.ai-sub-app .confirm-ok-btn:hover {
    opacity: 0.85;
}

/* ===================== MOBILE OVERLAY ===================== */
.ai-sub-app .sidebar-overlay {
    display: none;
    position: absolute;
    inset: 0;
    background: var(--bg-overlay);
    z-index: 90;
    animation: aiSubFadeIn 0.2s ease;
}

/* ===================== LOGIN REQUIRED ===================== */
.ai-sub-app .login-required {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 40px;
}

.ai-sub-app .login-required h3 {
    font-size: 22px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.ai-sub-app .login-required p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.ai-sub-app .login-buttons {
    display: flex;
    gap: 12px;
}

.ai-sub-app .login-buttons a {
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: opacity 0.15s;
}

.ai-sub-app .login-buttons .btn-primary {
    background: var(--accent);
    color: #fff;
}

.ai-sub-app .login-buttons .btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* ===================== LOADING INDICATOR ===================== */
.ai-sub-app .typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.ai-sub-app .typing-indicator span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-tertiary);
    animation: aiSubTyping 1.4s infinite ease-in-out;
}

.ai-sub-app .typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.ai-sub-app .typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes aiSubTyping {
    0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
    30% { opacity: 1; transform: translateY(-4px); }
}

/* ===================== THINKING WRAPPER ===================== */
.ai-sub-app .thinking-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
}

.ai-sub-app .thinking-wrapper .typing-indicator {
    padding: 0;
}

/* Thinking text */
.ai-sub-app .thinking-text {
    font-size: 14px;
    color: var(--text-secondary);
}

.ai-sub-app .thinking-text-fade {
    animation: aiSubFadeIn 1s ease forwards;
}

.ai-sub-app .thinking-text-fadeInOut {
    animation: aiSubFadeInOut 2s ease-in-out infinite;
}

@keyframes aiSubFadeInOut {
    0%, 100% { opacity: 0; }
    50% { opacity: 1; }
}

.ai-sub-app .thinking-text-typing {
    overflow: hidden;
    white-space: nowrap;
    width: 0;
    animation: aiSubTypewriter 2s steps(var(--chars)) 0.5s forwards;
}

@keyframes aiSubTypewriter {
    to { width: calc(var(--chars) * 1ch); }
}

/* Pulsing dot spinner */
.ai-sub-app .typing-pulse span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-tertiary);
    animation: aiSubPulse 1.2s infinite ease-in-out;
}

@keyframes aiSubPulse {
    0%, 100% { transform: scale(0.6); opacity: 0.3; }
    50% { transform: scale(1.2); opacity: 1; }
}

/* Spinning ring */
.ai-sub-app .typing-ring {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-light);
    border-top-color: var(--text-tertiary);
    border-radius: 50%;
    animation: aiSubSpin 0.8s linear infinite;
}

/* ===================== SKELETON LOADERS ===================== */
@keyframes aiSubShimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.ai-sub-app .skeleton-item {
    display: flex;
    align-items: center;
    padding: 9px 10px;
    gap: 8px;
}

.ai-sub-app .skeleton-line {
    height: 14px;
    border-radius: 6px;
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: aiSubShimmer 1.5s infinite ease-in-out;
}

.ai-sub-app .skeleton-group-label {
    height: 10px;
    width: 60px;
    margin: 10px 8px 6px;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: aiSubShimmer 1.5s infinite ease-in-out;
}

/* Spinner for "load more" and message loading */
.ai-sub-app .loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 0;
}

.ai-sub-app .loading-spinner::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-light);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: aiSubSpin 0.6s linear infinite;
}

@keyframes aiSubSpin {
    to { transform: rotate(360deg); }
}

/* ===================== QUOTA EXHAUSTION BANNER ===================== */

.ai-sub-app .quota-exhausted-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 14px;
    margin-bottom: 10px;
    background: var(--e-global-color-b54462a, #F1DAB0);
    border: 1px solid var(--e-global-color-1fe9fdf, #8B5403);
    border-radius: 25px;
    font-size: 13px;
    line-height: 1.4;
    color: var(--e-global-color-1fe9fdf, #8B5403);
    animation: aiSubBannerSlideDown 0.35s ease-out both;
}

/* Delayed entrance only on initial page load — errors show instantly */
.ai-sub-app .quota-exhausted-banner.page-load {
    animation-delay: 0.4s;
}

@keyframes aiSubBannerSlideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.ai-sub-app .quota-banner-content {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    flex: 1;
    min-width: 0;
}

.ai-sub-app .quota-banner-icon {
    flex-shrink: 0;
    margin-top: 1px;
}

.ai-sub-app .quota-banner-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.ai-sub-app .quota-banner-cta {
    padding: 5px 14px;
    background: var(--e-global-color-1fe9fdf, #8B5403);
    color: var(--e-global-color-b54462a, #F1DAB0);
    border: 1px solid var(--e-global-color-1fe9fdf, #8B5403);
    border-radius: 25px;
    font-family: var(--font-main);
    font-size: 12px;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.ai-sub-app .quota-banner-cta:hover {
    background: var(--e-global-color-b54462a, #F1DAB0);
    color: var(--e-global-color-1fe9fdf, #8B5403);
    border-color: var(--e-global-color-1fe9fdf, #8B5403);
    text-decoration: none;
}

.ai-sub-app .quota-banner-cta:focus,
.ai-sub-app .quota-banner-cta:active {
    outline: none;
}

.ai-sub-app .quota-banner-refresh {
    background: none;
    border: none;
    cursor: pointer;
    color: inherit;
    padding: 4px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
    line-height: 0;
}

.ai-sub-app .quota-banner-refresh:hover {
    background: rgba(0, 0, 0, 0.1);
}

.ai-sub-app[data-theme="dark"] .quota-banner-refresh:hover {
    background: rgba(255, 255, 255, 0.1);
}

.ai-sub-app .quota-banner-refresh.spinning svg {
    animation: quotaRefreshSpin 0.6s linear infinite;
}

@keyframes quotaRefreshSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Locked input box */
.ai-sub-app .input-box.quota-locked {
    opacity: 0.5;
    pointer-events: none;
}

/* Disabled new-chat buttons */
.ai-sub-app .new-chat-btn:disabled,
.ai-sub-app .new-chat-btn.quota-disabled,
.ai-sub-app .icon-btn.quota-disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

/* Dimmed suggestions (locked but layout-preserving) */
.ai-sub-app .suggestions-grid.quota-disabled {
    opacity: 0.35;
    pointer-events: none;
}

/* ===================== RESPONSIVE ===================== */

/* Tablet */
@media (max-width: 1024px) {
    .ai-sub-app {
        --sidebar-width: 260px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .ai-sub-app .sidebar {
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        width: var(--sidebar-width);
        min-width: var(--sidebar-width);
        transform: translateX(0);
        z-index: 100;
        box-shadow: var(--shadow-lg);
    }

    .ai-sub-app .sidebar.collapsed {
        transform: translateX(-100%);
        width: var(--sidebar-width);
        min-width: var(--sidebar-width);
    }

    .ai-sub-app .sidebar-overlay.visible {
        display: block;
    }

    .ai-sub-app .suggestion-btn {
        padding: 10px 14px;
        font-size: 13px;
        min-width: 140px;
    }

    .ai-sub-app .welcome-text h1 {
        font-size: 22px;
    }

    .ai-sub-app .input-area {
        padding: 0 10px 10px;
    }
}

@media (max-width: 480px) {
    .ai-sub-app {
        --sidebar-width: 260px;
    }

    .ai-sub-app .suggestions-grid {
        gap: 8px;
    }

    .ai-sub-app .suggestion-btn {
        padding: 12px 14px;
        font-size: 13px;
    }
}

/* ===================== VISUALLY HIDDEN (a11y) ===================== */
.ai-sub-app .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* Hide the sun/moon toggle when admin forces a specific theme */
.ai-sub-app[data-theme-forced="1"] .theme-toggle {
    display: none;
}
/* ===================== DISCLAIMER ===================== */
/* Optional admin-configurable notice rendered just below the prompt input. */
.ai-sub-app .ai-sub-disclaimer {
    margin: 8px 0 0;
    padding: 0 4px;
    text-align: center;
    font-size: 11px;
    line-height: 1.4;
    font-style: italic;
    color: var(--text-tertiary);
    opacity: 0.8;
}