/* ============================================
   TechDigest - 科技数码文案聚合网站 v3
   深色科技风主题 · 精修版
   ============================================ */

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2235;
    --bg-card: #162032;
    --bg-hover: #1e2d42;
    --border-color: #1e3a5f;
    --border-light: #2a3f5f;
    --text-primary: #e8edf5;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-pink: #ec4899;
    --gradient-hero: linear-gradient(135deg, #0ea5e9 0%, #8b5cf6 50%, #ec4899 100%);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.25s ease;
    --sidebar-width: 300px;
    --topbar-height: 56px;
    --content-max-width: 1260px;
}

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

html { font-size: 15px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a { color: var(--accent-cyan); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-blue); }

button {
    cursor: pointer; border: none; outline: none;
    font-family: inherit; font-size: inherit; transition: var(--transition);
}
ul { list-style: none; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ==================== Top Bar ==================== */
.top-bar {
    position: sticky; top: 0; z-index: 100;
    height: var(--topbar-height);
    background: rgba(17, 24, 39, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 24px;
}
.logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.3rem; font-weight: 700;
    background: var(--gradient-hero);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.logo i { font-size: 1.5rem; -webkit-text-fill-color: var(--accent-cyan); }
.top-bar-right { display: flex; align-items: center; gap: 16px; }
.update-time { font-size: 0.8rem; color: var(--text-muted); }
.refresh-btn {
    width: 36px; height: 36px; border-radius: 50%;
    background: var(--bg-tertiary); color: var(--text-secondary);
    display: flex; align-items: center; justify-content: center;
    border: 1px solid var(--border-color);
}
.refresh-btn:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--accent-cyan); }
.refresh-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.spinning { animation: spin 1s linear infinite; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* ==================== Main Layout ==================== */
.main-container {
    display: flex;
    min-height: calc(100vh - var(--topbar-height));
    justify-content: center;
}

/* ==================== Sidebar ==================== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex; flex-direction: column;
    position: sticky; top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    overflow-y: auto; flex-shrink: 0;
    margin-left: 40px;
}
.sidebar-nav { flex: 1; padding: 16px 8px; display: flex; flex-direction: column; gap: 4px; }
.nav-item {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 16px; border-radius: var(--radius-md);
    cursor: pointer; color: var(--text-secondary);
    font-size: 0.92rem; font-weight: 500;
    border: 1px solid transparent; transition: var(--transition);
}
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active {
    background: var(--bg-tertiary); color: var(--accent-cyan);
    border-color: var(--border-color);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.08);
}
.nav-item i { width: 22px; text-align: center; font-size: 1.1rem; }
.nav-item-disabled {
    cursor: not-allowed; opacity: 0.5; pointer-events: none;
}
.nav-item-disabled i { width: 22px; text-align: center; font-size: 1.1rem; }
.nav-item-disabled span { }
.badge-coming {
    font-size: 0.62rem; padding: 2px 8px; border-radius: 10px;
    background: rgba(139, 92, 246, 0.2); color: var(--accent-purple);
    margin-left: auto; white-space: nowrap;
}
.sidebar-footer { padding: 16px; border-top: 1px solid var(--border-color); }
.sidebar-stats { display: flex; gap: 8px; }
.stat-item {
    flex: 1; text-align: center; padding: 10px 6px;
    background: var(--bg-tertiary); border-radius: var(--radius-sm);
}
.stat-num { display: block; font-size: 1.2rem; font-weight: 700; color: var(--accent-cyan); }
.stat-label { font-size: 0.7rem; color: var(--text-muted); }

/* ==================== Content ==================== */
.content {
    flex: 1;
    max-width: var(--content-max-width);
    padding: 28px 36px;
    overflow-y: auto;
}

/* ==================== Sub Tabs ==================== */
.social-hotboard { max-width: 1050px; }
.tech-hotboard { max-width: 1200px; }
.sub-tabs {
    display: flex; gap: 6px; margin-bottom: 24px;
    background: var(--bg-secondary); padding: 5px;
    border-radius: var(--radius-md); border: 1px solid var(--border-color);
    max-width: 580px;
}
.sub-tab {
    flex: 1; padding: 10px 18px; border-radius: var(--radius-sm);
    background: transparent; color: var(--text-secondary);
    font-size: 0.85rem; font-weight: 500;
    display: flex; align-items: center; justify-content: center; gap: 7px;
}
.sub-tab:hover { color: var(--text-primary); }
.sub-tab.active { background: var(--bg-tertiary); color: var(--accent-cyan); box-shadow: var(--shadow-sm); }

/* ==================== Platform Buttons ==================== */
.platform-buttons {
    display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap;
}
.platform-btn {
    padding: 9px 18px; border-radius: var(--radius-md);
    background: var(--bg-secondary); color: var(--text-secondary);
    font-size: 0.83rem; font-weight: 500;
    border: 1px solid var(--border-color);
    display: flex; align-items: center; gap: 7px;
}
.platform-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.platform-btn.active { color: #fff; border-color: transparent; box-shadow: var(--shadow-md); }
.platform-btn.weibo.active { background: linear-gradient(135deg, #e6162d, #ff6b6b); }
.platform-btn.douyin.active { background: linear-gradient(135deg, #111, #333); border-color: #555; }
.platform-btn.toutiao.active { background: linear-gradient(135deg, #e13b3f, #ff6b6b); }
.platform-btn.baidu.active { background: linear-gradient(135deg, #2932e1, #6b7fff); }

/* ==================== Hot List (竖排) ==================== */
.hot-list-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    min-height: 300px; position: relative; overflow: hidden;
}
.hot-list { padding: 4px 0; }
.hot-item {
    display: flex; align-items: center; gap: 12px;
    padding: 11px 18px;
    border-bottom: 1px solid rgba(30, 58, 95, 0.25);
    transition: var(--transition);
}
.hot-item:last-child { border-bottom: none; }
.hot-item:hover { background: var(--bg-hover); }
.hot-rank {
    width: 26px; height: 26px; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.8rem; font-weight: 700; color: var(--text-muted);
    background: var(--bg-tertiary); border-radius: 6px;
}
.hot-rank.top3 { color: #fff; background: var(--gradient-hero); }
.hot-content {
    flex: 1; min-width: 0;
    display: flex; align-items: center; gap: 8px;
}
.hot-title {
    font-size: 0.88rem; font-weight: 500; color: var(--text-primary);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1;
}
.hot-title:hover { color: var(--accent-cyan); }
.hot-tag {
    font-size: 0.66rem; padding: 2px 8px; border-radius: 10px;
    white-space: nowrap; flex-shrink: 0;
}
.hot-tag.tag-new { background: rgba(16,185,129,0.15); color: var(--accent-green); }
.hot-tag.tag-hot { background: rgba(239,68,68,0.15); color: var(--accent-red); }
.hot-tag.tag-rising { background: rgba(245,158,11,0.15); color: var(--accent-orange); }
.hot-tag.tag-ad { background: rgba(100,116,139,0.15); color: var(--text-muted); }
.hot-empty-note {
    text-align: center; padding: 40px 20px; color: var(--text-muted);
    font-size: 0.85rem;
}

/* ==================== Loading & Error & Empty ==================== */
.loading-overlay {
    position: absolute; inset: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    background: rgba(17,24,39,0.9); z-index: 10; gap: 16px;
}
.spinner { width: 36px; height: 36px; border: 3px solid var(--border-color); border-top-color: var(--accent-cyan); border-radius: 50%; animation: spin 0.8s linear infinite; }
.error-message {
    display: flex; align-items: center; justify-content: center; gap: 12px;
    padding: 40px 20px; color: var(--accent-red); flex-direction: column;
}
.error-message i { font-size: 2rem; }
.error-message button { margin-top: 8px; padding: 8px 20px; border-radius: var(--radius-sm); background: var(--accent-red); color: #fff; }
.empty-state {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 60px 20px; color: var(--text-muted); gap: 12px;
}
.empty-state i { font-size: 3rem; }

/* ==================== Tech Controls ==================== */
.tech-controls {
    display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px;
}
.source-filter { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.filter-label { font-size: 0.78rem; color: var(--text-muted); margin-right: 2px; }
.source-tag {
    padding: 5px 12px; border-radius: 20px; font-size: 0.75rem;
    background: var(--bg-secondary); color: var(--text-secondary);
    border: 1px solid var(--border-color); cursor: pointer; transition: var(--transition);
}
.source-tag:hover { background: var(--bg-hover); color: var(--text-primary); }
.source-tag.active { background: var(--accent-blue); color: #fff; border-color: var(--accent-blue); }
.tech-search { max-width: 320px; }
.search-input {
    width: 100%; padding: 9px 14px; border-radius: var(--radius-md);
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    color: var(--text-primary); font-size: 0.85rem; outline: none; transition: var(--transition);
}
.search-input:focus { border-color: var(--accent-cyan); box-shadow: 0 0 0 3px rgba(6,182,212,0.1); }
.search-input::placeholder { color: var(--text-muted); }

/* ==================== Tech List ==================== */
.tech-list-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    min-height: 300px; position: relative; overflow: hidden; padding: 14px;
}
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
    gap: 12px;
}
.tech-card {
    background: var(--bg-card); border-radius: var(--radius-md);
    padding: 15px; border: 1px solid var(--border-color);
    transition: var(--transition); display: flex; flex-direction: column; gap: 8px;
}
.tech-card:hover { border-color: var(--accent-cyan); transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.tech-card-header { display: flex; align-items: center; justify-content: space-between; }
.tech-source-badge { font-size: 0.66rem; padding: 2px 8px; border-radius: 4px; color: #fff; font-weight: 600; }
.tech-time { font-size: 0.7rem; color: var(--text-muted); }
.tech-card-title { font-size: 0.9rem; font-weight: 600; line-height: 1.45; }
.tech-card-title a {
    color: var(--text-primary);
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.tech-card-title a:hover { color: var(--accent-cyan); }
.tech-card-desc {
    font-size: 0.78rem; color: var(--text-secondary); line-height: 1.45;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.tech-card-desc-empty { color: var(--text-muted); font-style: italic; }
.tech-card-tags { display: flex; gap: 5px; flex-wrap: wrap; }
.tech-tag { font-size: 0.65rem; padding: 2px 7px; border-radius: 4px; background: rgba(59,130,246,0.12); color: var(--accent-blue); }
.tech-tag-default { background: rgba(100,116,139,0.15); color: var(--text-muted); }
.tech-load-more {
    text-align: center; margin-top: 16px;
}
.tech-load-more button {
    padding: 10px 32px; border-radius: var(--radius-md);
    background: var(--bg-tertiary); color: var(--accent-cyan);
    border: 1px solid var(--border-color); font-size: 0.85rem;
}
.tech-load-more button:hover { background: var(--bg-hover); border-color: var(--accent-cyan); }
.tech-load-more button:disabled { opacity: 0.4; cursor: not-allowed; }

/* ==================== Placeholder ==================== */
.placeholder-panel { min-height: 70vh; display: flex; align-items: center; justify-content: center; }
.placeholder-content { text-align: center; max-width: 500px; }
.placeholder-icon {
    width: 100px; height: 100px; margin: 0 auto 24px;
    background: var(--bg-tertiary); border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid var(--border-color);
}
.placeholder-icon i { font-size: 2.5rem; color: var(--accent-cyan); }
.placeholder-content h2 {
    font-size: 1.6rem; margin-bottom: 8px;
    background: var(--gradient-hero);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.placeholder-desc { color: var(--text-secondary); margin-bottom: 24px; }
.coming-soon-badge {
    display: inline-flex; align-items: center; gap: 8px; padding: 10px 24px;
    background: rgba(139,92,246,0.12); border: 1px solid rgba(139,92,246,0.3);
    border-radius: var(--radius-md); color: var(--accent-purple); margin-bottom: 32px;
}
.feature-preview { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.feature-item {
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    padding: 16px 20px; background: var(--bg-tertiary); border-radius: var(--radius-md);
    border: 1px solid var(--border-color); min-width: 120px;
}
.feature-item i { font-size: 1.3rem; color: var(--accent-cyan); }
.feature-item span { font-size: 0.8rem; color: var(--text-secondary); }

/* ==================== AI Writer Panel ==================== */
.ai-writer-panel { padding: 0; }
.ai-writer-container { max-width: 100%; }

.ai-writer-header {
    display: flex; align-items: center; gap: 12px;
    padding: 20px 0 16px; border-bottom: 1px solid var(--border-color); margin-bottom: 20px;
}
.ai-writer-header i { font-size: 1.6rem; color: var(--accent-cyan); }
.ai-writer-header h2 { font-size: 1.3rem; color: var(--text-primary); margin: 0; }
.ai-badge {
    margin-left: auto; font-size: 0.72rem; padding: 3px 12px; border-radius: 12px;
    background: rgba(139,92,246,0.15); color: var(--accent-purple);
}

.ai-writer-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.ai-input-section, .ai-control-section {
    display: flex; flex-direction: column; gap: 16px;
}

.ai-field { display: flex; flex-direction: column; gap: 6px; }
.ai-label {
    font-size: 0.82rem; font-weight: 600; color: var(--text-secondary);
    display: flex; align-items: center; gap: 6px;
}
.ai-label i { color: var(--accent-cyan); width: 16px; text-align: center; }

.ai-input {
    padding: 10px 14px; border-radius: var(--radius-md);
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    color: var(--text-primary); font-size: 0.88rem; outline: none; transition: var(--transition);
}
.ai-input:focus { border-color: var(--accent-cyan); box-shadow: 0 0 0 3px rgba(6,182,212,0.1); }
.ai-input::placeholder { color: var(--text-muted); }

.ai-textarea {
    padding: 10px 14px; border-radius: var(--radius-md);
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    color: var(--text-primary); font-size: 0.85rem; outline: none;
    resize: vertical; font-family: inherit; line-height: 1.6; transition: var(--transition);
}
.ai-textarea:focus { border-color: var(--accent-cyan); box-shadow: 0 0 0 3px rgba(6,182,212,0.1); }
.ai-textarea::placeholder { color: var(--text-muted); }
.ai-textarea-main { min-height: 180px; }
.ai-textarea-sm { min-height: 60px; }
.ai-char-count { font-size: 0.7rem; color: var(--text-muted); text-align: right; margin-top: -4px; }

/* 参数卡片 */
.ai-params-card {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); padding: 18px;
    display: flex; flex-direction: column; gap: 16px;
}
.ai-params-title {
    font-size: 0.95rem; color: var(--text-primary);
    display: flex; align-items: center; gap: 8px; margin: 0 0 4px;
}
.ai-params-title i { color: var(--accent-purple); }

/* Radio 按钮组 */
.ai-radio-group {
    display: flex; flex-wrap: wrap; gap: 6px;
}
.ai-radio {
    display: flex; align-items: center; cursor: pointer;
    padding: 6px 13px; border-radius: 20px;
    background: var(--bg-tertiary); border: 1px solid var(--border-color);
    font-size: 0.78rem; color: var(--text-secondary); transition: var(--transition);
    user-select: none;
}
.ai-radio input { display: none; }
.ai-radio:hover { background: var(--bg-hover); color: var(--text-primary); }
.ai-radio.active {
    background: rgba(6,182,212,0.15); border-color: var(--accent-cyan);
    color: var(--accent-cyan); font-weight: 600;
}

/* API 设置卡片（BYOK：用户自带 key） */
.ai-api-card { gap: 12px; border-color: rgba(6,182,212,0.35); }
.ai-api-toggle {
    margin-left: auto; background: transparent; border: 1px solid var(--border-color);
    color: var(--text-muted); font-size: 0.72rem; padding: 2px 10px; border-radius: 12px; cursor: pointer;
    transition: var(--transition);
}
.ai-api-toggle:hover { color: var(--accent-cyan); border-color: var(--accent-cyan); }
.ai-api-status {
    font-size: 0.78rem; padding: 8px 12px; border-radius: var(--radius-sm);
    display: flex; align-items: center; gap: 7px; line-height: 1.4;
}
.ai-api-status.ok { background: rgba(34,197,94,0.12); color: var(--accent-green); border: 1px solid rgba(34,197,94,0.3); }
.ai-api-status.warn { background: rgba(234,179,8,0.1); color: #eab308; border: 1px solid rgba(234,179,8,0.25); }
.ai-key-row { display: flex; gap: 8px; align-items: center; }
.ai-key-row .ai-input { flex: 1; }
.ai-eye-btn {
    flex: 0 0 auto; width: 40px; height: 40px; border-radius: var(--radius-sm);
    background: var(--bg-tertiary); border: 1px solid var(--border-color); color: var(--text-secondary);
    cursor: pointer; display: flex; align-items: center; justify-content: center; transition: var(--transition);
}
.ai-eye-btn:hover { color: var(--accent-cyan); border-color: var(--accent-cyan); }
.ai-input-sub { margin-top: 8px; }
.ai-api-actions { display: flex; gap: 8px; }
.ai-api-actions .ai-action-btn.primary { background: var(--gradient-hero); color: #fff; border: none; }
.ai-api-actions .ai-action-btn.primary:hover { color: #fff; box-shadow: 0 4px 16px rgba(6,182,212,0.3); }
.ai-api-hint { font-size: 0.72rem; color: var(--text-muted); line-height: 1.5; margin: 0; }

/* 生成按钮 */
.ai-generate-btn {
    width: 100%; padding: 14px; border-radius: var(--radius-md);
    background: var(--gradient-hero); color: #fff; font-size: 1rem; font-weight: 600;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    border: none; cursor: pointer; transition: var(--transition);
    box-shadow: 0 4px 20px rgba(6,182,212,0.3);
    margin-top: 4px;
}
.ai-generate-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 25px rgba(6,182,212,0.4); }
.ai-generate-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

/* 输出区 */
.ai-output-section {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); overflow: hidden;
    animation: fadeInUp 0.4s ease;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.ai-output-header {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 18px; border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}
.ai-output-header h3 {
    font-size: 0.9rem; color: var(--text-primary);
    display: flex; align-items: center; gap: 8px; margin: 0;
}
.ai-output-header h3 i { color: var(--accent-green); }
.ai-output-actions { display: flex; gap: 6px; margin-left: auto; }

/* 选项卡栏（紧贴 header 下方） */
.ai-output-tabbar {
    display: flex; gap: 0;
    padding: 0 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}
.ai-tab-btn {
    padding: 10px 18px; border: none;
    border-bottom: 2px solid transparent;
    background: transparent; color: var(--text-muted);
    font-size: 0.82rem; font-weight: 500; cursor: pointer;
    display: flex; align-items: center; gap: 6px;
    transition: var(--transition); border-radius: 0;
    margin-bottom: -1px;
}
.ai-tab-btn:hover { color: var(--text-primary); background: rgba(6,182,212,0.04); }
.ai-tab-btn.active {
    color: var(--accent-cyan); font-weight: 600;
    border-bottom-color: var(--accent-cyan);
    background: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-top: 2px solid var(--accent-cyan);
}
.ai-tab-btn.active i { color: var(--accent-cyan); }
.ai-action-btn {
    padding: 6px 12px; border-radius: var(--radius-sm);
    background: var(--bg-secondary); color: var(--text-secondary);
    border: 1px solid var(--border-color); font-size: 0.75rem;
    display: flex; align-items: center; gap: 5px; cursor: pointer; transition: var(--transition);
}
.ai-action-btn:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--accent-cyan); }

.ai-output-content { padding: 20px 24px; }
.ai-output-meta {
    display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 16px;
    font-size: 0.75rem; color: var(--text-muted);
}
.ai-output-meta span { display: flex; align-items: center; gap: 4px; }
.ai-output-meta i { font-size: 0.7rem; }
.ai-output-title h2 {
    font-size: 1.3rem; font-weight: 700; color: var(--text-primary);
    margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border-color);
    line-height: 1.4;
}
.ai-output-body { line-height: 1.8; color: var(--text-secondary); }
.ai-output-body h2 {
    font-size: 1.1rem; font-weight: 600; color: var(--text-primary);
    margin: 20px 0 10px;
}
.ai-output-body h3 {
    font-size: 0.95rem; font-weight: 600; color: var(--text-primary);
    margin: 16px 0 8px;
}
.ai-output-body p { margin-bottom: 10px; }
.ai-output-body li { margin-left: 20px; margin-bottom: 4px; list-style: disc; }
.ai-output-plain p { text-indent: 2em; margin-bottom: 12px; }
.ai-output-char-count {
    text-align: right; margin-top: 16px; padding-top: 10px;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem; color: var(--text-muted);
}

/* 空状态 */
.ai-empty-state {
    text-align: center; padding: 40px 20px;
    background: var(--bg-secondary); border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
}
.ai-empty-icon {
    width: 72px; height: 72px; margin: 0 auto 16px;
    background: var(--bg-tertiary); border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid var(--border-color);
}
.ai-empty-icon i { font-size: 2rem; color: var(--accent-cyan); }
.ai-empty-state h3 { font-size: 1.1rem; color: var(--text-primary); margin-bottom: 8px; }
.ai-empty-state > p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 20px; }
.ai-tips { display: flex; flex-direction: column; gap: 10px; max-width: 480px; margin: 0 auto; text-align: left; }
.ai-tip-item {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 10px 14px; background: var(--bg-tertiary);
    border-radius: var(--radius-sm); font-size: 0.82rem; color: var(--text-secondary);
}
.ai-tip-item i { color: var(--accent-orange); margin-top: 2px; flex-shrink: 0; }

/* ==================== PPT Panel ==================== */
.ppt-panel { padding: 0; }
.ppt-container { max-width: 100%; }

.ppt-header {
    display: flex; align-items: center; gap: 12px;
    padding: 20px 0 16px; border-bottom: 1px solid var(--border-color); margin-bottom: 20px;
}
.ppt-header i { font-size: 1.6rem; color: #D24726; }
.ppt-header h2 { font-size: 1.3rem; color: var(--text-primary); margin: 0; }
.ppt-badge {
    margin-left: auto; font-size: 0.72rem; padding: 3px 12px; border-radius: 12px;
    background: rgba(210,71,38,0.15); color: #D24726;
}

.ppt-body {
    display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 20px;
}
.ppt-input-section, .ppt-control-section {
    display: flex; flex-direction: column; gap: 16px;
}

.ppt-field { display: flex; flex-direction: column; gap: 6px; }
.ppt-label {
    font-size: 0.82rem; font-weight: 600; color: var(--text-secondary);
    display: flex; align-items: center; gap: 6px;
}
.ppt-label i { color: #D24726; width: 16px; text-align: center; }

.ppt-input {
    padding: 10px 14px; border-radius: var(--radius-md);
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    color: var(--text-primary); font-size: 0.88rem; outline: none; transition: var(--transition);
}
.ppt-input:focus { border-color: #D24726; box-shadow: 0 0 0 3px rgba(210,71,38,0.1); }
.ppt-input::placeholder { color: var(--text-muted); }

.ppt-textarea {
    padding: 10px 14px; border-radius: var(--radius-md);
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    color: var(--text-primary); font-size: 0.84rem; outline: none;
    resize: vertical; font-family: inherit; line-height: 1.6; transition: var(--transition);
    min-height: 220px;
}
.ppt-textarea:focus { border-color: #D24726; box-shadow: 0 0 0 3px rgba(210,71,38,0.1); }
.ppt-textarea::placeholder { color: var(--text-muted); }
.ppt-char-count { font-size: 0.7rem; color: var(--text-muted); text-align: right; margin-top: -4px; }

/* 输入方式切换 */
.ppt-input-tabs { display: flex; gap: 6px; }
.ppt-input-tab {
    flex: 1; padding: 8px 12px; border-radius: var(--radius-sm);
    background: var(--bg-secondary); color: var(--text-secondary);
    border: 1px solid var(--border-color); font-size: 0.8rem;
    display: flex; align-items: center; justify-content: center; gap: 6px;
    cursor: pointer; transition: var(--transition);
}
.ppt-input-tab:hover { background: var(--bg-hover); color: var(--text-primary); }
.ppt-input-tab.active { background: rgba(210,71,38,0.12); border-color: #D24726; color: #D24726; }

/* 上传区 */
.ppt-upload-zone {
    background: var(--bg-secondary); border: 2px dashed var(--border-color);
    border-radius: var(--radius-md); padding: 30px; text-align: center;
    cursor: pointer; transition: var(--transition); min-height: 140px;
    display: flex; align-items: center; justify-content: center;
}
.ppt-upload-zone:hover { border-color: #D24726; background: rgba(210,71,38,0.04); }
.ppt-upload-icon { font-size: 2rem; color: var(--text-muted); margin-bottom: 10px; }
.ppt-upload-zone p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 4px; }
.ppt-upload-hint { font-size: 0.72rem; color: var(--text-muted); }
.ppt-upload-done {
    display: flex; align-items: center; gap: 10px;
    color: var(--accent-green); font-size: 0.9rem; font-weight: 600;
}
.ppt-upload-done i { font-size: 1.3rem; }
.ppt-upload-remove {
    width: 22px; height: 22px; border-radius: 50%; background: rgba(239,68,68,0.15);
    color: var(--accent-red); font-size: 0.7rem; display: flex; align-items: center; justify-content: center;
    cursor: pointer; border: none; margin-left: auto;
}

/* 参数卡片 */
.ppt-params-card {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); padding: 18px;
    display: flex; flex-direction: column; gap: 16px;
}
.ppt-params-title {
    font-size: 0.95rem; color: var(--text-primary);
    display: flex; align-items: center; gap: 8px; margin: 0 0 4px;
}
.ppt-params-title i { color: #D24726; }

/* PPT Radio 按钮 */
.ppt-radio-group { display: flex; flex-wrap: wrap; gap: 6px; }
.ppt-radio {
    display: flex; align-items: center; cursor: pointer;
    padding: 6px 13px; border-radius: 20px;
    background: var(--bg-tertiary); border: 1px solid var(--border-color);
    font-size: 0.78rem; color: var(--text-secondary); transition: var(--transition);
    user-select: none;
}
.ppt-radio input { display: none; }
.ppt-radio:hover { background: var(--bg-hover); color: var(--text-primary); }
.ppt-radio.active { background: rgba(210,71,38,0.12); border-color: #D24726; color: #D24726; font-weight: 600; }

/* 主题网格 */
.ppt-theme-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.ppt-theme-item {
    text-align: center; cursor: pointer; padding: 6px; border-radius: var(--radius-sm);
    border: 2px solid transparent; transition: var(--transition);
}
.ppt-theme-item:hover { border-color: var(--border-light); }
.ppt-theme-item.active { border-color: #D24726; background: rgba(210,71,38,0.06); }
.ppt-theme-preview {
    width: 100%; height: 36px; border-radius: 4px; margin-bottom: 6px;
}
.ppt-theme-item span { font-size: 0.7rem; color: var(--text-secondary); }
.ppt-theme-item.active span { color: #D24726; font-weight: 600; }

/* Checkbox */
.ppt-check-group { display: flex; gap: 16px; flex-wrap: wrap; }
.ppt-check {
    display: flex; align-items: center; gap: 6px; font-size: 0.8rem;
    color: var(--text-secondary); cursor: pointer; user-select: none;
}
.ppt-check input { accent-color: #D24726; }

/* 生成按钮 */
.ppt-generate-btn {
    width: 100%; padding: 14px; border-radius: var(--radius-md);
    background: linear-gradient(135deg, #D24726, #EA580C); color: #fff;
    font-size: 1rem; font-weight: 600;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    border: none; cursor: pointer; transition: var(--transition);
    box-shadow: 0 4px 20px rgba(210,71,38,0.3); margin-top: 4px;
}
.ppt-generate-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 25px rgba(210,71,38,0.4); }
.ppt-generate-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

/* 下载按钮 */
.ppt-download-btn {
    width: 100%; padding: 14px; border-radius: var(--radius-md);
    background: linear-gradient(135deg, #059669, #10B981); color: #fff;
    font-size: 1rem; font-weight: 600;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    border: none; cursor: pointer; transition: var(--transition);
    box-shadow: 0 4px 20px rgba(5,150,105,0.3);
}
.ppt-download-btn:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 6px 25px rgba(5,150,105,0.4); }
.ppt-download-btn:disabled {
    opacity: 0.45; cursor: not-allowed; transform: none;
    background: var(--bg-tertiary); color: var(--text-muted);
    box-shadow: none; border: 1px solid var(--border-color);
}

/* 生成状态提示 */
.ppt-status-bar {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px; background: rgba(5,150,105,0.08);
    border: 1px solid rgba(5,150,105,0.25); border-radius: var(--radius-sm);
    font-size: 0.8rem; color: #10B981;
}
.ppt-status-bar i { font-size: 0.9rem; }

/* 预览提示条 */
.ppt-preview-bar {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 18px; background: var(--bg-secondary);
    border: 1px solid var(--border-color); border-radius: var(--radius-md);
    font-size: 0.82rem; color: var(--text-secondary);
}
.ppt-preview-bar i { color: var(--accent-cyan); }
.ppt-preview-count { margin-left: auto; font-size: 0.78rem; color: #D24726; white-space: nowrap; }

/* ==================== PPT Three-Column Panel ==================== */
.ppt-outline-gen-btn {
    width: 100%; padding: 10px; border-radius: var(--radius-md);
    background: linear-gradient(135deg, #D24726, #EA580C); color: #fff;
    border: none; font-size: 0.82rem; font-weight: 600;
    display: flex; align-items: center; justify-content: center; gap: 6px;
    cursor: pointer; transition: var(--transition); margin-top: 4px;
    box-shadow: 0 2px 12px rgba(210,71,38,0.25);
}
.ppt-outline-gen-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(210,71,38,0.35); }
.ppt-outline-gen-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }

.ppt-body-3col {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 16px;
    align-items: stretch;
}
.ppt-col {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); overflow: hidden;
    display: flex; flex-direction: column;
}
.ppt-col-header {
    padding: 10px 14px; border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary); font-size: 0.82rem; font-weight: 600;
    color: var(--text-primary); display: flex; align-items: center; gap: 8px;
}
.ppt-col-header i { color: #D24726; }
.ppt-col-input { padding: 10px; gap: 8px; }
.ppt-col-params { padding: 10px; gap: 8px; }
.ppt-col-outline { flex: 1; }

.ppt-label-sm { font-size: 0.72rem; color: var(--text-muted); font-weight: 600; margin-bottom: 2px; }

.ppt-textarea-3col {
    min-height: 180px; font-size: 0.78rem;
}

/* 三栏折叠大纲列表 */
.ppt-col-outline .ppt-outline-list {
    padding: 6px; display: flex; flex-direction: column; gap: 6px;
    max-height: calc(100vh - 300px); overflow-y: auto;
}
.ppt-col-outline .outline-slide {
    background: var(--bg-primary); border: 1px solid var(--border-color);
    border-radius: var(--radius-sm); overflow: hidden;
}
.ppt-col-outline .outline-slide-header {
    cursor: pointer; user-select: none;
}
.ppt-col-outline .outline-slide-header:hover { background: var(--bg-hover); }
.outline-toggle {
    color: var(--text-muted); font-size: 0.7rem; margin-left: auto; margin-right: 4px;
    transition: transform 0.2s;
}
.outline-num {
    width: 22px; height: 22px; border-radius: 50%;
    background: #D24726; color: #fff; font-size: 11px; font-weight: 700;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.outline-title-input {
    flex: 1; padding: 5px 8px; border-radius: 3px;
    background: transparent; border: 1px solid transparent;
    color: var(--text-primary); font-size: 0.78rem; font-weight: 600;
    outline: none; font-family: inherit; min-width: 0;
}
.outline-title-input:focus { border-color: #D24726; background: var(--bg-secondary); }
.outline-points { padding: 3px 6px 6px 10px; }
.outline-point { display: flex; align-items: flex-start; gap: 4px; margin: 2px 0; }
.outline-bullet { color: #D24726; font-size: 0.9rem; line-height: 1.8; }
.outline-point-input {
    flex: 1; padding: 3px 6px; border-radius: 3px;
    background: transparent; border: 1px solid transparent;
    color: var(--text-secondary); font-size: 0.75rem;
    outline: none; resize: none; font-family: inherit; line-height: 1.5;
    min-height: 24px; overflow: hidden;
}
.outline-point-input:focus { border-color: var(--accent-cyan); background: var(--bg-secondary); }
.outline-points-textarea {
    width: 100%; padding: 8px 10px; border-radius: 4px;
    background: var(--bg-primary); border: 1px solid var(--border-color);
    color: var(--text-secondary); font-size: 0.78rem;
    outline: none; resize: vertical; font-family: inherit;
    line-height: 1.7; min-height: 80px;
}
.outline-points-textarea:focus { border-color: var(--accent-cyan); }
.outline-btn-del {
    width: 20px; height: 20px; border-radius: 50%; background: transparent;
    color: var(--text-muted); font-size: 0.65rem; display: flex; align-items: center; justify-content: center;
    cursor: pointer; border: none; flex-shrink: 0;
}
.outline-btn-del:hover { background: rgba(239,68,68,0.12); color: #ef4444; }
.outline-btn-del-sm {
    width: 18px; height: 18px; border-radius: 50%; background: transparent;
    color: var(--text-muted); font-size: 0.6rem; display: flex; align-items: center; justify-content: center;
    cursor: pointer; border: none; flex-shrink: 0;
}
.outline-btn-del-sm:hover { background: rgba(239,68,68,0.12); color: #ef4444; }
.outline-btn-add {
    display: flex; align-items: center; gap: 3px; margin: 2px 0;
    padding: 3px 8px; border-radius: 3px;
    background: transparent; border: 1px dashed var(--border-color);
    color: var(--text-muted); font-size: 0.72rem; cursor: pointer;
}
.outline-btn-add:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); }
.outline-btn-add-section {
    width: 100%; padding: 6px; border-radius: var(--radius-sm);
    background: transparent; border: 1px dashed var(--border-color);
    color: var(--text-muted); font-size: 0.75rem; display: flex; align-items: center; justify-content: center; gap: 4px;
    cursor: pointer;
}
.outline-btn-add-section:hover { border-color: #D24726; color: #D24726; }

/* ==================== Responsive ==================== */
@media (max-width: 900px) {
    .main-container { flex-direction: column; }
    .sidebar {
        width: 100%; height: auto; position: relative; top: 0;
        flex-direction: row; border-right: none; border-bottom: 1px solid var(--border-color); padding: 8px;
    }
    .sidebar-nav { flex-direction: row; gap: 8px; padding: 4px; overflow-x: auto; }
    .nav-item { padding: 10px 14px; font-size: 0.8rem; white-space: nowrap; }
    .sidebar-footer { display: none; }
    .content { padding: 16px; max-width: 100%; }
    .tech-grid { grid-template-columns: 1fr; }
    .sub-tabs { max-width: 100%; }
    .ai-writer-body { grid-template-columns: 1fr; }
    .ppt-body { grid-template-columns: 1fr; }
    .ppt-theme-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 500px) {
    .sub-tabs { flex-direction: column; }
    .platform-buttons { flex-direction: column; }
    .platform-btn { width: 100%; justify-content: center; }
}