:root {
            --primary: #1a6eff;
            --primary-light: #e8f1ff;
            --primary-dark: #0d4fc4;
            --primary-gradient: linear-gradient(135deg, #1a6eff 0%, #0d4fc4 100%);
            --text: #1a1a2e;
            --text-secondary: #5a5a7a;
            --text-light: #8a8aa0;
            --bg: #ffffff;
            --bg-warm: #f8fafc;
            --bg-card: #ffffff;
            --border: #e8ecf4;
            --shadow: 0 4px 24px rgba(26, 110, 255, 0.08);
            --shadow-hover: 0 12px 40px rgba(26, 110, 255, 0.15);
            --radius: 16px;
            --radius-sm: 10px;
            --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            --warning: #ff6b35;
            --warning-light: #fff3ed;
            --danger: #dc2626;
            --danger-light: #fef2f2;
            --success: #16a34a;
            --success-light: #f0fdf4;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; scroll-padding-top: 80px; }
        body {
            font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
            color: var(--text);
            background: var(--bg);
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* ===== NAVIGATION ===== */
        .navbar {
            position: fixed;
            top: 0; left: 0; right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(26, 110, 255, 0.08);
            transition: var(--transition);
        }
        .navbar.scrolled { box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06); }
        .nav-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }
        .logo-icon {
            /*width: 44px; height: 44px;
            background: var(--primary-gradient);
            border-radius: 12px;*/
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 900;
            font-size: 18px;
            /*box-shadow: 0 4px 12px rgba(26, 110, 255, 0.3);*/
        }
        .logo-icon img{
            height: 44px;
        }
        .logo-text {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.3;
        }
        .logo-text span {
            display: block;
            font-size: 11px;
            font-weight: 400;
            color: var(--text-light);
            letter-spacing: 1px;
        }
        .nav-links {
            display: flex;
            gap: 4px;
            list-style: none;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 8px;
            transition: var(--transition);
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--primary);
            background: var(--primary-light);
        }
        .mobile-toggle {
            display: none;
            width: 40px; height: 40px;
            border: none;
            background: var(--primary-light);
            border-radius: 10px;
            cursor: pointer;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
        }
        .mobile-toggle span {
            display: block;
            width: 20px; height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* ===== FOOTER ===== */
        .footer {
            background: var(--text);
            color: white;
            padding: 64px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 48px;
        }
        .footer-brand .logo-icon {
            /*background: var(--primary);*/
            margin-bottom: 16px;
            display: flex;
            align-items: left;
            justify-content: left;
        }
        .footer-brand .logo-icon img{
            height: 84px;
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 20px;
            color: rgba(255, 255, 255, 0.9);
        }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 10px; }
        .footer-col a {
            color: rgba(255, 255, 255, 0.5);
            text-decoration: none;
            font-size: 14px;
            transition: var(--transition);
        }
        .footer-col a:hover { color: white; }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p,
        .footer-bottom a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== PAGE HEADER ===== */
        .page-header {
            padding: 140px 0 60px;
            background: linear-gradient(180deg, #f0f5ff 0%, #ffffff 100%);
            text-align: center;
        }
        .page-header h1 {
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 900;
            color: var(--text);
            margin-bottom: 12px;
        }
        .page-header p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.8;
        }
        .page-header img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 0 auto 16px;
            border-radius: var(--radius-sm);
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-bottom: 20px;
            font-size: 13px;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
        }
        .breadcrumb a:hover { text-decoration: underline; }

        /* ===== SECTION COMMON ===== */
        .section {
            padding: 80px 0;
            position: relative;
        }
        .section-alt { background: var(--bg-warm); }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-header {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
        }
        .section-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 12px;
            padding: 4px 16px;
            background: var(--primary-light);
            border-radius: 100px;
        }
        .section-title {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 800;
            color: var(--text);
            line-height: 1.3;
            margin-bottom: 12px;
        }
        .section-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* ===== SCROLL ANIMATION ===== */
        .reveal {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

/* ============================================================
   学术搜索集成 · 页面专属样式（追加于官网 style.css 之后）
   ============================================================ */
.tool-hero {
    padding: 130px 0 48px;
    background: linear-gradient(180deg, #f0f5ff 0%, #ffffff 100%);
    text-align: center;
}
.tool-hero h1 { font-size: clamp(26px, 4vw, 38px); font-weight: 900; margin-bottom: 12px; }
.tool-hero h1 .highlight { background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.tool-hero p { font-size: 15px; color: var(--text-secondary); max-width: 640px; margin: 0 auto; line-height: 1.8; }
.tool-chips { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.tool-chips span { font-size: 12px; font-weight: 600; color: var(--primary); background: var(--primary-light); border: 1px solid rgba(26,110,255,0.15); padding: 5px 14px; border-radius: 100px; }
.breadcrumb { display: flex; align-items: center; justify-content: center; gap: 8px; margin-bottom: 18px; font-size: 13px; color: var(--text-light); }
.breadcrumb a { color: var(--primary); text-decoration: none; font-weight: 500; }
.breadcrumb a:hover { text-decoration: underline; }

.tool-section { padding: 64px 0; }
.tool-section.alt { background: var(--bg-warm); }
.tool-card-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.tool-note { display: flex; align-items: flex-start; gap: 14px; background: linear-gradient(135deg, #e8f1ff 0%, #f0f5ff 100%); border: 1.5px solid rgba(26,110,255,0.15); border-radius: var(--radius); padding: 18px 22px; margin-bottom: 24px; }
.tool-note .tn-icon { width: 40px; height: 40px; background: var(--primary-gradient); border-radius: 10px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: #fff; }
.tool-note h4 { font-size: 15px; color: var(--primary); margin-bottom: 4px; }
.tool-note p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin: 0; }

/* ===== 聚合搜索 ===== */
.search-bar { display: flex; gap: 12px; margin-bottom: 16px; }
.search-bar input[type="text"] { flex: 1; min-width: 0; padding: 14px 18px; border: 1.5px solid var(--border); border-radius: 12px; font-size: 15px; font-family: inherit; color: var(--text); transition: var(--transition); }
.search-bar input[type="text"]:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(26,110,255,0.12); }
.search-bar select { padding: 14px 14px; border: 1.5px solid var(--border); border-radius: 12px; font-size: 14px; font-family: inherit; color: var(--text); background: #fff; cursor: pointer; }
.btn-solid { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 26px; border: none; border-radius: 12px; background: var(--primary-gradient); color: #fff; font-size: 15px; font-weight: 700; font-family: inherit; cursor: pointer; box-shadow: 0 6px 18px rgba(26,110,255,0.3); transition: var(--transition); white-space: nowrap; }
.btn-solid:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(26,110,255,0.4); }
.btn-ghost2 { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 20px; border: 1.5px solid var(--border); border-radius: 12px; background: #fff; color: var(--text-secondary); font-size: 14px; font-weight: 600; font-family: inherit; cursor: pointer; transition: var(--transition); white-space: nowrap; }
.btn-ghost2:hover { border-color: var(--primary); color: var(--primary); }
.smart-hint { display: none; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 13px; color: var(--text-secondary); background: var(--warning-light); border: 1px solid rgba(255,107,53,0.25); border-radius: 10px; padding: 10px 16px; margin-bottom: 16px; }
.hint-btn { border: 1px solid rgba(255,107,53,0.4); background: #fff; color: #ff6b35; font-size: 12px; font-weight: 600; padding: 4px 12px; border-radius: 100px; cursor: pointer; font-family: inherit; }
.hint-btn:hover { background: #ff6b35; color: #fff; }
.engine-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.engine-card { position: relative; display: flex; align-items: center; gap: 14px; text-align: left; background: #fff; border: 1.5px solid var(--border); border-radius: 14px; padding: 16px 18px; cursor: pointer; font-family: inherit; transition: var(--transition); }
.engine-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: rgba(26,110,255,0.3); }
.engine-card.picked { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,110,255,0.15); }
.engine-icon { width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.engine-info { flex: 1; min-width: 0; }
.engine-info strong { display: block; font-size: 15px; color: var(--text); margin-bottom: 2px; }
.engine-info strong em { font-style: normal; font-size: 11px; font-weight: 500; color: var(--text-light); margin-left: 6px; }
.engine-desc { display: block; font-size: 12px; color: var(--text-light); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.engine-go { font-size: 12px; font-weight: 700; flex-shrink: 0; }
.engine-mark { position: absolute; top: 8px; right: 8px; width: 22px; height: 22px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 12px; font-weight: 900; display: none; align-items: center; justify-content: center; }
.engine-tip { font-size: 12px; color: var(--text-light); margin-top: 12px; }

/* ===== 转换中心选项卡 ===== */
.conv-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.conv-tab { padding: 10px 22px; border-radius: 100px; border: 1.5px solid var(--border); background: #fff; font-family: inherit; font-size: 14px; font-weight: 600; color: var(--text-secondary); cursor: pointer; transition: var(--transition); }
.conv-tab:hover { border-color: var(--primary); color: var(--primary); }
.conv-tab.active { background: var(--primary-gradient); color: #fff; border-color: transparent; box-shadow: 0 4px 14px rgba(26,110,255,0.3); }
.conv-panel { display: none; }
.conv-panel.active { display: block; animation: fadeInUp 0.35s ease; }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

.conv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.conv-col h5 { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.conv-col h5 .dot { width: 6px; height: 6px; background: var(--primary); border-radius: 50%; }
.ta-wrap { position: relative; }
textarea.ta { width: 100%; min-height: 260px; padding: 14px 16px; border: 1.5px solid var(--border); border-radius: 12px; font-family: 'SFMono-Regular', Consolas, 'Noto Sans SC', monospace; font-size: 13px; line-height: 1.8; color: var(--text); background: #fcfdff; resize: vertical; transition: var(--transition); }
textarea.ta:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(26,110,255,0.1); background: #fff; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
.btn-row select { padding: 10px 12px; border: 1.5px solid var(--border); border-radius: 10px; font-size: 13px; font-family: inherit; color: var(--text); background: #fff; cursor: pointer; }
.btn-sm { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: 10px; border: none; font-size: 13px; font-weight: 700; font-family: inherit; cursor: pointer; transition: var(--transition); }
.btn-sm.primary { background: var(--primary-gradient); color: #fff; box-shadow: 0 4px 12px rgba(26,110,255,0.25); }
.btn-sm.primary:hover { transform: translateY(-2px); }
.btn-sm.ghost { background: #fff; color: var(--text-secondary); border: 1.5px solid var(--border); }
.btn-sm.ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm.copied { background: var(--success) !important; color: #fff !important; }

.parsed-list { margin-top: 14px; max-height: 220px; overflow-y: auto; border: 1px solid var(--border); border-radius: 12px; background: #fff; }
.parsed-empty { padding: 18px; text-align: center; font-size: 12px; color: var(--text-light); }
.parsed-item { display: flex; align-items: center; gap: 10px; width: 100%; padding: 10px 14px; border: none; border-bottom: 1px solid var(--border); background: transparent; font-family: inherit; cursor: pointer; text-align: left; transition: background 0.2s; }
.parsed-item:last-child { border-bottom: none; }
.parsed-item:hover { background: var(--danger-light); }
.pi-no { width: 22px; height: 22px; border-radius: 6px; background: var(--primary-light); color: var(--primary); font-size: 11px; font-weight: 800; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.pi-title { flex: 1; min-width: 0; font-size: 13px; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pi-meta { font-size: 11px; color: var(--text-light); flex-shrink: 0; max-width: 40%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pi-del { font-size: 11px; color: var(--danger); flex-shrink: 0; opacity: 0; transition: opacity 0.2s; }
.parsed-item:hover .pi-del { opacity: 1; }

/* ===== DOI / 标准号 ===== */
.sub-card { background: #fff; border: 1.5px solid var(--border); border-radius: 14px; padding: 22px; margin-bottom: 18px; }
.sub-card h5 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.sub-card .sub-desc { font-size: 12px; color: var(--text-light); margin-bottom: 14px; }
.inline-row { display: flex; gap: 10px; flex-wrap: wrap; }
.inline-row input[type="text"] { flex: 1; min-width: 200px; padding: 12px 16px; border: 1.5px solid var(--border); border-radius: 10px; font-size: 14px; font-family: inherit; }
.inline-row input[type="text"]:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(26,110,255,0.1); }
.doi-status { font-size: 13px; margin: 12px 0 10px; padding: 10px 14px; border-radius: 10px; display: none; }
.doi-status.loading { display: block; background: var(--primary-light); color: var(--primary); }
.doi-status.ok { display: block; background: var(--success-light); color: var(--success); }
.doi-status.err { display: block; background: var(--danger-light); color: var(--danger); }
.std-result { margin-top: 12px; font-size: 13px; }
.std-line { padding: 8px 12px; border-radius: 8px; background: var(--bg-warm); margin-bottom: 6px; color: var(--text-secondary); }
.std-line.ok { background: var(--success-light); color: var(--success); }
.std-line.err { background: var(--danger-light); color: var(--danger); }

/* ===== 标点和编号 ===== */
.opt-row { display: flex; gap: 16px; flex-wrap: wrap; margin: 10px 0; }
.opt-row label { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-secondary); cursor: pointer; }

/* ===== Toast / 动画 ===== */
#toast { position: fixed; left: 50%; bottom: 36px; transform: translateX(-50%) translateY(80px); background: var(--text); color: #fff; font-size: 13px; font-weight: 500; padding: 12px 22px; border-radius: 100px; box-shadow: 0 12px 32px rgba(0,0,0,0.25); z-index: 9999; opacity: 0; transition: all 0.35s cubic-bezier(0.4,0,0.2,1); pointer-events: none; max-width: 86vw; text-align: center; }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.shake { animation: shake 0.4s; }
@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-6px)} 75%{transform:translateX(6px)} }

/* ===== 页面响应式（工具专属区块） ===== */
@media (max-width: 1024px) {
    .engine-grid { grid-template-columns: repeat(2, 1fr); }
    .conv-grid { grid-template-columns: 1fr; }
    textarea.ta { min-height: 200px; }
}
@media (max-width: 768px) {
    .tool-hero { padding: 108px 0 36px; }
    .tool-section { padding: 44px 0; }
    .tool-card-box { padding: 18px; }
    .search-bar { flex-direction: column; }
    .search-bar select { width: 100%; }
    .btn-solid { width: 100%; }
    .engine-grid { grid-template-columns: 1fr; }
    .conv-tabs { gap: 6px; }
    .conv-tab { padding: 8px 16px; font-size: 13px; }
    .inline-row { flex-direction: column; }
    .inline-row input[type="text"] { min-width: 0; width: 100%; }
    .btn-row .btn-sm, .btn-row select { flex: 1; justify-content: center; }
    .pi-meta { display: none; }
}


/* ===== 渐进增强：JS 不可用时 .reveal 区块保持可见，杜绝白页 ===== */
html:not(.js) .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }