: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（与官网一致） ===== */
.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 { display: flex; align-items: center; justify-content: center; color: white; font-weight: 900; font-size: 18px; }
.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（与官网一致） ===== */
.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 { 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); }

/* ===== 工具页通用 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.tool-hero {
    padding: 140px 0 40px;
    background: linear-gradient(180deg, #f0f5ff 0%, #ffffff 100%);
    text-align: center;
}
.breadcrumb { display: flex; align-items: center; justify-content: center; gap: 8px; margin-bottom: 18px; font-size: 13px; color: var(--text-light); flex-wrap: wrap; }
.breadcrumb a { color: var(--primary); text-decoration: none; font-weight: 500; }
.breadcrumb a:hover { text-decoration: underline; }
.tool-hero h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 900; color: var(--text); margin-bottom: 14px; }
.tool-hero h1 .highlight { background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.tool-hero > .container > p { font-size: 15px; color: var(--text-secondary); max-width: 720px; margin: 0 auto 20px; line-height: 1.8; }
.hero-tags { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.hero-tags span {
    font-size: 12px; font-weight: 600; color: var(--primary);
    background: var(--primary-light); padding: 4px 14px; border-radius: 100px;
}

/* ===== 工作台 ===== */
.workspace { padding: 40px 0 64px; }

.tool-tabs {
    display: flex; gap: 8px; flex-wrap: nowrap;
    overflow-x: auto; padding: 6px 2px 12px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    position: sticky; top: 72px; z-index: 50;
    background: var(--bg);
}
.tool-tabs::-webkit-scrollbar { height: 4px; }
.tool-tabs::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.tool-tab {
    flex-shrink: 0;
    display: inline-flex; align-items: center; gap: 6px;
    padding: 9px 18px;
    border: 1.5px solid var(--border);
    background: white; border-radius: 100px;
    font-family: inherit; font-size: 13px; font-weight: 600;
    color: var(--text-secondary); cursor: pointer;
    transition: var(--transition); white-space: nowrap;
}
.tool-tab:hover { border-color: var(--primary); color: var(--primary); }
.tool-tab.active {
    background: var(--primary-gradient); color: white; border-color: transparent;
    box-shadow: 0 4px 16px rgba(26, 110, 255, 0.3);
}

.tool-desc-bar {
    display: flex; align-items: flex-start; gap: 12px;
    background: var(--bg-warm); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 14px 18px; margin-bottom: 20px;
}
.tool-desc-bar .dot { width: 8px; height: 8px; background: var(--primary); border-radius: 50%; margin-top: 8px; flex-shrink: 0; }
.tool-desc-bar p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin: 0; }

/* 选项面板 */
.options-panel {
    display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
    background: white; border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 14px 18px; margin-bottom: 20px;
}
.opt-label { font-size: 13px; font-weight: 700; color: var(--text); margin-right: 4px; }
.opt-group { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-secondary); }
.opt-group select, .opt-group input[type="text"], .opt-group input[type="number"] {
    font-family: inherit; font-size: 13px;
    border: 1.5px solid var(--border); border-radius: 8px;
    padding: 6px 10px; color: var(--text); background: white;
    outline: none; transition: var(--transition);
}
.opt-group select:focus, .opt-group input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.opt-group input[type="number"] { width: 88px; }
.opt-group input[type="text"] { width: 140px; }
.opt-check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; user-select: none; }
.opt-check input { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }

/* 输入输出区 */
.io-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.io-panel {
    background: white; border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden;
    display: flex; flex-direction: column;
}
.io-head {
    display: flex; align-items: center; justify-content: space-between; gap: 10px;
    padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--bg-warm);
    flex-wrap: wrap;
}
.io-title { font-size: 14px; font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 8px; }
.io-title .badge { font-size: 11px; font-weight: 600; padding: 2px 10px; border-radius: 100px; }
.badge-in { background: var(--primary-light); color: var(--primary); }
.badge-out { background: var(--success-light); color: var(--success); }
.io-stats { font-size: 12px; color: var(--text-light); font-variant-numeric: tabular-nums; }
.io-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.mini-btn {
    display: inline-flex; align-items: center; gap: 4px;
    font-family: inherit; font-size: 12px; font-weight: 600;
    color: var(--text-secondary); background: white;
    border: 1px solid var(--border); border-radius: 8px;
    padding: 5px 10px; cursor: pointer; transition: var(--transition);
}
.mini-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.mini-btn svg { width: 13px; height: 13px; }

textarea.io-area {
    flex: 1; min-height: 340px; width: 100%;
    border: none; outline: none; resize: vertical;
    padding: 16px; font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 13.5px; line-height: 1.75; color: var(--text);
    background: white; tab-size: 4;
}
.io-foot { padding: 10px 16px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-light); background: var(--bg-warm); }
.io-foot strong { color: var(--primary); }

/* 执行按钮 */
.exec-bar { display: flex; justify-content: center; margin: 22px 0; }
.exec-btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 48px; border: none; border-radius: 12px;
    background: var(--primary-gradient); color: white;
    font-family: inherit; font-size: 16px; font-weight: 700;
    cursor: pointer; box-shadow: 0 8px 24px rgba(26, 110, 255, 0.35);
    transition: var(--transition);
}
.exec-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(26, 110, 255, 0.45); }
.exec-btn:active { transform: translateY(0); }
.exec-hint { text-align: center; font-size: 12px; color: var(--text-light); margin-top: -12px; margin-bottom: 22px; }
kbd {
    font-family: inherit; font-size: 11px; background: var(--bg-warm);
    border: 1px solid var(--border); border-bottom-width: 2px;
    border-radius: 5px; padding: 1px 6px; color: var(--text-secondary);
}

/* Toast */
.toast {
    position: fixed; left: 50%; bottom: 40px;
    transform: translateX(-50%) translateY(20px);
    background: var(--text); color: white;
    font-size: 14px; font-weight: 500;
    padding: 12px 24px; border-radius: 10px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
    opacity: 0; visibility: hidden; z-index: 9999;
    transition: var(--transition); pointer-events: none;
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* 功能说明 */
.doc-section { padding: 64px 0; background: var(--bg-warm); }
.section-header { text-align: center; max-width: 640px; margin: 0 auto 40px; }
.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; }
.doc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.doc-card {
    background: white; border: 1px solid var(--border); border-radius: var(--radius);
    padding: 24px; transition: var(--transition);
}
.doc-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: rgba(26, 110, 255, 0.2); }
.doc-card .doc-icon { width: 44px; height: 44px; background: var(--primary-light); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 14px; }
.doc-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.doc-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

.privacy-banner {
    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: 20px 24px; margin-bottom: 32px;
}
.privacy-banner .p-icon {
    width: 40px; height: 40px; background: var(--primary); border-radius: 10px;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.privacy-banner .p-icon svg { width: 22px; height: 22px; color: white; }
.privacy-banner h4 { font-size: 15px; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.privacy-banner p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin: 0; }

/* ===== 响应式（对齐官网断点） ===== */
@media (max-width: 1024px) {
    .doc-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute; top: 72px; left: 0; right: 0;
        background: white; flex-direction: column;
        padding: 16px 24px; box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        gap: 4px; border-bottom: 1px solid var(--border); z-index: 999;
    }
    .nav-links.active { display: flex; }
    .mobile-toggle { display: flex; }

    .tool-hero { padding: 120px 0 32px; }
    .tool-tabs { top: 72px; }
    .io-grid { grid-template-columns: 1fr; }
    textarea.io-area { min-height: 220px; }
    .options-panel { gap: 10px; padding: 12px 14px; }
    .doc-grid { grid-template-columns: 1fr; }
    .doc-section { padding: 48px 0; }
    .privacy-banner { flex-direction: column; gap: 12px; padding: 16px 20px; }
    .exec-btn { width: 100%; justify-content: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}