/* ===== CSS 变量 ===== */
:root {
    --primary:       #4285f4;
    --primary-hover: #3367d6;
    --bg:            #ffffff;
    --card-bg:       #f8f9fa;
    --text:          #202124;
    --muted:         #5f6368;
    --border:        #dadce0;
    --danger:        #ea4335;
    --success:       #34a853;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    margin: 0;
    padding: 0;
}

.hidden { display: none !important; }

/* ===== 通用按钮 ===== */
.primary-btn {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: .65rem 1.4rem;
    border-radius: .5rem;
    cursor: pointer;
    font-weight: 500;
    font-size: .88rem;
    transition: background .2s;
    white-space: nowrap;
}
.primary-btn:hover { background: var(--primary-hover); }
.primary-btn.large-btn { padding: .9rem 2.2rem; font-size: 1.05rem; border-radius: .7rem; }

.secondary-btn {
    background: #fff;
    color: var(--text);
    border: 1px solid var(--border);
    padding: .5rem 1rem;
    border-radius: .5rem;
    cursor: pointer;
    font-size: .88rem;
    white-space: nowrap;
    transition: border-color .2s, color .2s;
}
.secondary-btn:hover { border-color: var(--primary); color: var(--primary); }

.text-btn {
    background: none; border: none;
    color: var(--muted); cursor: pointer;
    padding: .4rem .5rem; font-size: .88rem;
}

.close-btn {
    background: none; border: none;
    font-size: 1.35rem; cursor: pointer;
    color: var(--muted); line-height: 1;
    padding: .1rem .3rem; border-radius: .35rem;
    transition: background .15s;
}
.close-btn:hover { background: var(--card-bg); }

.new-chat-btn {
    width: 100%;
    background: var(--card-bg);
    color: var(--text);
    border: 1px solid var(--border);
    padding: .75rem 1rem;
    border-radius: .5rem;
    cursor: pointer;
    font-size: .88rem;
    font-weight: 500;
    transition: all .2s;
    text-align: left;
}
.new-chat-btn:hover {
    background: #e8eaed;
    border-color: var(--primary);
}

/* ===== 登录界面 ===== */
#login-view {
    height: 100vh;
    display: flex; align-items: center; justify-content: center;
    text-align: center;
    background: linear-gradient(135deg,#f0f0ff 0%,#f9fafb 100%);
}
.hero-logo {
    font-size: 2rem; font-weight: 900;
    color: var(--primary); margin-bottom: 1rem;
    letter-spacing: -.03em;
}
.hero h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: .75rem; }
.hero p  { color: var(--muted); margin-bottom: 2rem; font-size: 1.05rem; }

/* ===== Chat 视图 ===== */
#chat-view { 
    height: 100vh; 
    display: flex; 
}

/* 左侧边栏 */
.left-sidebar {
    width: 280px;
    border-right: 1px solid var(--border);
    background: var(--bg);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width 0.3s ease;
}

.left-sidebar.collapsed {
    width: 0;
    overflow: hidden;
    border-right: none;
}

.sidebar-header {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    flex-shrink: 0;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.toggle-sidebar-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--muted);
}

.toggle-sidebar-btn:hover {
    background: var(--card-bg);
    color: var(--primary);
}

.toggle-icon {
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}

.left-sidebar.collapsed .toggle-icon {
    transform: rotate(180deg);
}

.expand-sidebar-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--muted);
    margin-right: 0.5rem;
}

.expand-sidebar-btn:hover {
    background: var(--card-bg);
    color: var(--primary);
}

.expand-sidebar-btn.hidden {
    display: none;
}

.expand-icon {
    font-size: 0.75rem;
}

/* 主内容区域 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

header {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: .75rem 1.5rem;
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    gap: 1rem; 
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.header-right {
    display: flex;
    align-items: center;
    gap: .65rem;
    flex-wrap: wrap;
}

/* 用户菜单 */
.user-menu-container {
    position: relative;
    display: flex;
    align-items: center;
}

.user-menu-trigger {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.4rem 0.75rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#username-display {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-menu-trigger:hover {
    background-color: var(--card-bg);
}

.guest-login-btn {
    padding: 0.5rem 1.25rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.guest-login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.guest-login-btn:active {
    transform: translateY(0);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

.user-menu-arrow {
    font-size: 0.6rem;
    color: var(--muted);
}

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: white;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    min-width: 180px;
    z-index: 1000;
    overflow: hidden;
}

.user-menu-dropdown.hidden {
    display: none;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
    font-size: 0.9rem;
    color: var(--text);
}

.user-menu-item:hover {
    background-color: var(--card-bg);
}

.menu-icon {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.user-menu-divider {
    height: 1px;
    background-color: var(--border);
    margin: 0.25rem 0;
}

.language-selector select {
    flex: 1;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 0.25rem;
    background: white;
    color: var(--text);
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
}

.language-selector select:hover {
    border-color: var(--primary);
}

.language-selector select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.1);
}

.logo { font-weight: 900; font-size: 1.2rem; color: var(--primary); letter-spacing: -.02em; }

.plan-badge {
    font-size: .72rem; font-weight: 700;
    padding: .2rem .55rem; border-radius: 999px;
    text-transform: uppercase; letter-spacing: .04em;
    flex-shrink: 0;
}
.plan-badge.free     { background:#f3f4f6; color:var(--muted); }
.plan-badge.lite     { background:#fef9c3; color:#854d0e; }
.plan-badge.standard { background:#dbeafe; color:#1e40af; }
.plan-badge.pro      { background:#ede9fe; color:#5b21b6; }
.plan-badge.ultra    { background: linear-gradient(90deg,#fbbf24,#f87171); color:#fff; }

.sub-entry-btn   { }

/* 模型选择器 */
.model-selector {
    display: flex; gap: .3rem;
    background: var(--bg); border: 1px solid var(--border);
    border-radius: .5rem; padding: .2rem;
}
.model-btn {
    padding: .3rem .8rem; border: none; border-radius: .35rem;
    background: transparent; cursor: pointer;
    font-size: .82rem; font-weight: 600; color: var(--muted);
    transition: all .15s;
}
.model-btn.active { background: var(--card-bg); color: var(--primary); box-shadow: 0 1px 3px rgba(0,0,0,.1); }
.model-btn:disabled { opacity: .4; cursor: not-allowed; }

/* 广告横幅 */
.ad-banner {
    background: linear-gradient(90deg, #fef3c7, #fff7ed);
    border-bottom: 1px solid #fde68a;
    padding: .55rem 1.5rem;
    display: flex; align-items: center; gap: 1rem;
    font-size: .85rem; color: #92400e; flex-shrink: 0;
}
.ad-banner span { flex: 1; }
.ad-upgrade-btn {
    background: #f59e0b; color: #fff; border: none;
    padding: .3rem .85rem; border-radius: .4rem;
    cursor: pointer; font-weight: 700; font-size: .82rem;
    white-space: nowrap; transition: background .15s;
}
.ad-upgrade-btn:hover { background: #d97706; }
.ad-close { background: none; border: none; cursor: pointer; color: #92400e; font-size: 1.1rem; line-height: 1; }

/* 配额状态栏 */
.quota-bar {
    display: flex; gap: 1rem; align-items: center;
    padding: .35rem 1rem; background: var(--bg);
    border-bottom: 1px solid var(--border); flex-shrink: 0;
    font-size: .78rem; flex-wrap: wrap;
}
.quota-item {
    display: flex; align-items: center; gap: .3rem;
    color: var(--muted); white-space: nowrap;
}
.quota-item strong { color: var(--text); }
.quota-item.depleted strong { color: var(--danger); }

/* 聊天区域 */
.chat-area {
    flex: 1; 
    display: flex; 
    flex-direction: column;
    max-width: 820px; 
    margin: 0 auto; 
    width: 100%;
    padding: 1rem;
    overflow: hidden;
}

.chat-container {
    flex: 1; 
    overflow-y: auto; 
    padding: 1rem 0;
    display: flex; 
    flex-direction: column; 
    gap: 1.5rem;
}

.message {
    max-width: 82%; 
    padding: .75rem 1rem;
    border-radius: .75rem;
    position: relative;
}

.message.user {
    align-self: flex-end; 
    background: var(--primary); 
    color: #fff; 
    border-bottom-right-radius: .25rem;
}

.message.ai {
    align-self: flex-start; 
    background: var(--card-bg); 
    color: var(--text); 
    border: 1px solid var(--border);
    border-bottom-left-radius: .25rem;
}

.message.error {
    align-self: center; 
    background: #fee2e2; 
    color: #991b1b; 
    border: 1px solid #fecaca; 
    font-size: .875rem; 
    max-width: 90%;
}

.message img {
    max-width: 100%; 
    border-radius: .5rem; 
    margin-top: .5rem;
}

/* 输入区 */
.input-area {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: .75rem; padding: .5rem;
    display: flex; gap: .5rem; margin-bottom: .5rem; flex-shrink: 0;
}
.input-wrapper { flex: 1; display: flex; gap: .5rem; align-items: flex-end; }
#user-input {
    flex: 1; border: none; resize: none; padding: .5rem; outline: none;
    font-size: 1rem; min-height: 40px; max-height: 180px; background: transparent;
}
.input-actions { display: flex; padding-bottom: 5px; }
.icon-btn { cursor: pointer; font-size: 1.2rem; padding: .4rem; border-radius: .45rem; transition: background .2s; }
.icon-btn:hover { background: #f3f4f6; }

#file-preview-container {
    position: relative;
    padding: .5rem;
    border-top: 1px solid var(--border);
}

.file-preview {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--card-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border);
}

.file-icon {
    font-size: 1.25rem;
}

.file-name {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#remove-file {
    background: var(--danger);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    flex-shrink: 0;
}

.error-text { color: var(--danger); font-size: .875rem; padding: .4rem 0; }

/* ===== 侧边栏 ===== */
.sidebar {
    display: flex; 
    flex-direction: column;
}

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    display: flex; 
    flex-direction: column;
    gap: .75rem;
}

.sidebar-actions { 
    display: flex; 
    align-items: center; 
    gap: .5rem;
    margin-top: .5rem;
}

.text-btn.danger { color: var(--danger); }
.text-btn.danger:hover { text-decoration: underline; }

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: .5rem;
}

.history-section {
    margin-bottom: 1rem;
}

.history-section-title {
    font-size: .75rem;
    font-weight: 600;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: .05em;
    padding: .5rem .75rem;
    margin-bottom: .25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-section-title.clickable {
    cursor: pointer;
    border-radius: .5rem;
    transition: background .15s;
}

.history-section-title.clickable:hover {
    background: var(--card-bg);
}

.expand-icon {
    font-size: .65rem;
    color: var(--muted);
    transition: transform .2s;
}

.history-items {
    display: block;
}

/* 左侧边栏 */
.left-sidebar {
    width: 280px;
    border-right: 1px solid var(--border);
    background: var(--card-bg);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-section {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.sidebar-section:last-child {
    border-bottom: none;
    flex: 1;
    overflow-y: auto;
}

/* 聊天类型切换 */
.chat-type-toggle {
    display: flex;
    gap: .5rem;
}

.chat-type-btn {
    flex: 1;
    padding: .6rem .75rem;
    border: 1px solid var(--border);
    border-radius: .5rem;
    background: var(--bg);
    cursor: pointer;
    font-size: .85rem;
    font-weight: 500;
    color: var(--text);
    transition: all .15s;
}

.chat-type-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.chat-type-btn:hover:not(.active) {
    background: #e8eaed;
}

/* 新建对话按钮 */
.new-chat-btn {
    width: 100%;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    padding: .75rem 1rem;
    border-radius: .5rem;
    cursor: pointer;
    font-size: .9rem;
    font-weight: 500;
    transition: all .2s;
    text-align: left;
}

.new-chat-btn:hover {
    background: #e8eaed;
    border-color: var(--primary);
}

/* 模型选择下拉菜单 */
.input-toolbar {
    display: flex;
    align-items: center;
    margin-bottom: .5rem;
}

.model-dropdown {
    position: relative;
}

.model-dropdown-btn {
    display: flex;
    align-items: center;
    gap: .5rem;
    padding: .4rem .75rem;
    border: 1px solid var(--border);
    border-radius: .5rem;
    background: var(--bg);
    cursor: pointer;
    font-size: .85rem;
    color: var(--text);
    transition: all .15s;
}

.model-dropdown-btn:hover {
    background: #e8eaed;
}

.dropdown-arrow {
    font-size: .7rem;
    color: var(--muted);
}

.model-dropdown-menu {
    position: absolute;
    bottom: 100%;
    left: 0;
    margin-bottom: .25rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: .5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,.15);
    min-width: 120px;
    z-index: 100;
}

.model-option {
    padding: .6rem 1rem;
    cursor: pointer;
    font-size: .85rem;
    color: var(--text);
    transition: background .15s;
}

.model-option:hover {
    background: #e8eaed;
}

.model-option.active {
    background: var(--primary);
    color: #fff;
}

.model-option:first-child {
    border-radius: .5rem .5rem 0 0;
}

.model-option:last-child {
    border-radius: 0 0 .5rem .5rem;
}

/* 历史记录项 */
.history-item {
    padding: .75rem 1rem;
    cursor: pointer;
    transition: background .2s;
    border-radius: .5rem;
    margin-bottom: .25rem;
    display: flex;
    flex-direction: column;
    gap: .25rem;
}

.history-item:hover {
    background: var(--card-bg);
}

.history-preview {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text);
    font-size: .9rem;
}

.history-time {
    font-size: .72rem;
    color: var(--muted);
}

.empty-history {
    text-align: center;
    color: var(--muted);
    padding: 2rem 1rem;
    font-size: .9rem;
}

/* ===== 通用弹窗 ===== */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,.5);
    display: flex; align-items: center; justify-content: center;
    z-index: 200; padding: 1rem;
}
.modal {
    background: var(--card-bg); border-radius: 1.25rem;
    width: min(480px, 100%); box-shadow: 0 12px 40px rgba(0,0,0,.18);
    overflow: hidden; max-height: 92vh; display: flex; flex-direction: column;
}
.modal-wide { width: min(860px, 100%); }
.modal-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.1rem 1.5rem; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.modal-header h3 { font-size: 1.08rem; font-weight: 700; }
.modal-body {
    padding: 1.5rem; display: flex; flex-direction: column;
    gap: 1.1rem; overflow-y: auto;
}
.sub-modal-body { gap: 1.4rem; }
.section-label {
    font-size: .78rem; font-weight: 700;
    color: var(--muted); text-transform: uppercase; letter-spacing: .06em;
}



/* ===== 订阅弹窗 ===== */
.current-sub-card {
    background: linear-gradient(135deg, #ede9fe, #e0e7ff);
    border-radius: .8rem; padding: 1rem 1.25rem;
    display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; align-items: flex-start;
}
.sub-status-info { display: flex; flex-direction: column; gap: .15rem; }
.sub-status-label { font-size: .75rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.sub-status-info strong { font-size: 1rem; color: var(--primary); font-weight: 800; }
.sub-quota-row { width: 100%; display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .25rem; }
.sub-quota-tag {
    background: rgba(79,70,229,.1); color: var(--primary);
    border-radius: 999px; padding: .2rem .65rem;
    font-size: .75rem; font-weight: 600;
}

/* 套餐网格 */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(185px, 1fr));
    gap: 1rem;
}
.plan-card {
    border: 2px solid var(--border); border-radius: 1rem;
    padding: 1.25rem 1rem; display: flex; flex-direction: column; gap: .65rem;
    cursor: pointer; transition: border-color .2s, box-shadow .2s;
    position: relative; background: #fff;
}
.plan-card:hover { border-color: var(--primary); box-shadow: 0 4px 16px rgba(79,70,229,.12); }
.plan-card.current { border-color: var(--primary); box-shadow: 0 4px 16px rgba(79,70,229,.15); }
.plan-card.popular::before {
    content: '推荐';
    position: absolute; top: -.7rem; left: 50%; transform: translateX(-50%);
    background: var(--primary); color: #fff;
    font-size: .72rem; font-weight: 700; padding: .2rem .6rem;
    border-radius: 999px; white-space: nowrap;
}
.plan-card.ultra-card { border-color: #f59e0b; }
.plan-card.ultra-card:hover { border-color: #d97706; box-shadow: 0 4px 16px rgba(245,158,11,.18); }

.tools-help {
    margin-bottom: 0.5rem;
    padding: 0.75rem;
    background: var(--card-bg);
    border-radius: 0.5rem;
}

.tools-help p {
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.tool-selection-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tools-header {
    margin-bottom: 1rem;
}

.tools-header p {
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 0.75rem;
}

.tools-list {
    max-height: 400px;
    overflow-y: auto;
}

.tool-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1rem;
    margin-bottom: 0.75rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.tool-card:hover {
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(79,70,229,.1);
}

.tool-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.tool-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
}

.tool-card-actions {
    display: flex;
    gap: 0.5rem;
}

.tool-card-description {
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.tool-card-meta {
    font-size: 0.75rem;
    color: var(--muted);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 999px;
    text-transform: uppercase;
}

.badge.system {
    background: #f3f4f6;
    color: #6b7280;
}

.badge.template {
    background: #ede9fe;
    color: #7c3aed;
}

.plan-name { font-size: 1.05rem; font-weight: 800; }
.plan-price { font-size: 1.55rem; font-weight: 900; color: var(--primary); line-height: 1; }
.plan-price span { font-size: .82rem; font-weight: 500; color: var(--muted); }
.plan-price.ultra-price { color: #d97706; }

.plan-features { list-style: none; display: flex; flex-direction: column; gap: .38rem; margin-top: .25rem; }
.plan-features li { font-size: .8rem; color: var(--muted); display: flex; align-items: flex-start; gap: .4rem; }
.plan-features li::before { content: '✓'; color: var(--success); font-weight: 700; flex-shrink: 0; }
.plan-features li.no::before { content: '✗'; color: #d1d5db; }
.plan-features li.no { color: #d1d5db; }

.plan-buy-btn {
    margin-top: auto; width: 100%; padding: .6rem;
    border: 2px solid var(--primary); border-radius: .6rem;
    background: transparent; color: var(--primary);
    font-weight: 700; cursor: pointer; font-size: .88rem;
    transition: all .15s;
}
.plan-buy-btn:hover    { background: var(--primary); color: #fff; }
.plan-buy-btn.current  { background: var(--primary); color: #fff; cursor: default; }
.plan-buy-btn.ultra-btn { border-color: #f59e0b; color: #d97706; }
.plan-buy-btn.ultra-btn:hover { background: #f59e0b; color: #fff; border-color: #f59e0b; }

/* 自定义提示词 */
.prompt-section { display: flex; flex-direction: column; gap: .6rem; }
.prompt-textarea {
    width: 100%; height: 110px; padding: .75rem;
    border: 1.5px solid var(--border); border-radius: .65rem;
    font-size: .9rem; resize: vertical; outline: none;
    font-family: inherit; transition: border-color .15s;
}
.prompt-textarea:focus { border-color: var(--primary); }
.prompt-actions { display: flex; justify-content: space-between; align-items: center; }
.prompt-char-count { font-size: .78rem; color: var(--muted); }
.prompt-save-msg { font-size: .85rem; padding: .25rem 0; }
.prompt-save-msg.ok  { color: var(--success); }
.prompt-save-msg.err { color: var(--danger); }

/* ===== 自定义 Agent 样式 ===== */
.agents-header {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1rem;
}

.agents-list {
    max-height: 400px;
    overflow-y: auto;
}

.agent-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: .75rem;
    padding: 1rem;
    margin-bottom: .75rem;
    transition: border-color .2s, box-shadow .2s;
    cursor: pointer;
}

.agent-card:hover {
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(79,70,229,.1);
}

.agent-card.active {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.05);
    box-shadow: 0 2px 8px rgba(79,70,229,.15);
}

.agent-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: .5rem;
}

.agent-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
}

.agent-card-actions {
    display: flex;
    gap: .5rem;
}

.agent-card-description {
    font-size: .85rem;
    color: var(--muted);
    margin-bottom: .75rem;
    line-height: 1.4;
}

.agent-card-meta {
    font-size: .75rem;
    color: var(--muted);
    display: flex;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: .4rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: .65rem;
    border: 1px solid var(--border);
    border-radius: .5rem;
    font-size: .9rem;
    font-family: inherit;
    transition: border-color .2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.char-count {
    font-size: .75rem;
    color: var(--muted);
    text-align: right;
    margin-top: .25rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: .75rem;
    margin-top: 1.5rem;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .sidebar      { width: 100%; }
    .pay-channels { flex-direction: column; }
    .plans-grid   { grid-template-columns: 1fr 1fr; }
    header        { padding: .65rem 1rem; }
    .header-center { display: none; }
}
@media (max-width: 440px) {
    .plans-grid { grid-template-columns: 1fr; }
}