/* ============ 全局样式 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --bg: #0f172a; --bg2: #1e293b; --bg3: #334155;
    --text: #f1f5f9; --text2: #94a3b8; --text3: #64748b;
    --primary: #3b82f6; --primary-hover: #2563eb;
    --success: #22c55e; --danger: #ef4444; --warning: #eab308;
    --border: #334155; --radius: 8px;
}
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }
a { color: var(--primary); text-decoration: none; }

/* ============ 导航栏 ============ */
header { background: var(--bg2); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.navbar { max-width: 1400px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; }
.logo-icon { font-size: 24px; }
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text); font-size: 24px; cursor: pointer; }

/* ============ 搜索框 ============ */
.search-box { flex: 1; max-width: 300px; min-width: 200px; }
.search-box input { width: 100%; padding: 8px 14px; background: var(--bg); border: 1px solid var(--border); border-radius: 20px; color: var(--text); font-size: 14px; outline: none; transition: border-color .2s; }
.search-box input:focus { border-color: var(--primary); }
.search-box input::placeholder { color: var(--text3); }

/* ============ 导航链接 ============ */
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.nav-link { padding: 8px 14px; border-radius: 6px; color: var(--text2); font-size: 14px; transition: all .2s; cursor: pointer; }
.nav-link:hover, .nav-link.active { color: var(--text); background: var(--bg3); }

/* ============ 下拉菜单 ============ */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle { display: flex; align-items: center; gap: 4px; }
.dropdown-arrow { font-size: 10px; transition: transform .2s; }
.nav-dropdown:hover .dropdown-arrow { transform: rotate(180deg); }
.nav-dropdown-menu { display: none; position: absolute; top: 100%; left: 0; min-width: 180px; background: var(--bg2); border: 1px solid var(--border); border-radius: 8px; padding: 8px 0; box-shadow: 0 8px 24px rgba(0,0,0,0.3); z-index: 1000; max-height: 400px; overflow-y: auto; }
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.dropdown-item { display: block; padding: 8px 16px; color: var(--text2); font-size: 13px; transition: all .15s; white-space: nowrap; }
.dropdown-item:hover { background: var(--bg3); color: var(--text); }

/* ============ 首页 ============ */
.hero { text-align: center; padding: 60px 20px 40px; }
.hero h1 { font-size: 36px; margin-bottom: 12px; }
.hero-sub { color: var(--text2); font-size: 18px; }

/* ============ 工具分类 ============ */
.tool-category { margin-bottom: 48px; }
.category-title { font-size: 22px; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid var(--bg3); display: flex; align-items: center; gap: 8px; }
.category-count { font-size: 14px; color: var(--text3); font-weight: normal; }

/* ============ 工具网格 ============ */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; }
.tool-card { background: var(--bg2); border: 1px solid var(--border); border-radius: 12px; padding: 20px 14px; text-align: center; cursor: pointer; transition: all .2s; position: relative; display: block; color: var(--text); }
.tool-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(59,130,246,0.15); }
.tool-icon { font-size: 28px; margin-bottom: 10px; font-weight: 700; color: var(--primary); }
.tool-card h3 { font-size: 14px; margin-bottom: 6px; }
.tool-card p { font-size: 12px; color: var(--text2); line-height: 1.4; }

/* ============ 工具标签 ============ */
.tool-tag { position: absolute; top: 8px; right: 8px; font-size: 10px; padding: 2px 8px; border-radius: 10px; background: var(--primary); color: white; }
.tool-tag-api { background: #8b5cf6; }
.tool-tag-soon { background: var(--text3); }
.tool-card-disabled { opacity: 0.5; pointer-events: none; }
.tool-card-coming-soon { opacity: 0.7; }

/* ============ 隐藏的工具（搜索用） ============ */
.tool-card.hidden { display: none; }
.tool-category.hidden { display: none; }

/* ============ 工具页面 ============ */
.page { display: none; max-width: 1000px; margin: 0 auto; padding: 20px; }
.page.active { display: block; }
.tool-header { text-align: center; padding: 30px 0; }
.tool-header h1 { font-size: 26px; margin-bottom: 8px; }
.tool-header h2 { font-size: 28px; margin-bottom: 8px; }
.tool-header p { color: var(--text2); }
.tool-body { padding-bottom: 40px; }

/* ============ 按钮 ============ */
.btn { padding: 8px 16px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg2); color: var(--text); cursor: pointer; font-size: 14px; transition: all .2s; }
.btn:hover { background: var(--bg3); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); border-color: var(--success); color: white; }
.btn-danger { background: var(--danger); border-color: var(--danger); color: white; }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* ============ JSON面板 ============ */
.json-toolbar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.json-panels { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.json-panel label, .single-panel label { display: block; font-size: 13px; color: var(--text2); margin-bottom: 6px; }
.json-panel textarea, .single-panel textarea { width: 100%; min-height: 300px; background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; color: var(--text); font-family: 'Fira Code', monospace; font-size: 14px; resize: vertical; }
.single-panel { margin-bottom: 16px; }
.status-bar { margin-top: 12px; padding: 8px 12px; border-radius: 6px; font-size: 13px; }
.status-bar.success { background: rgba(34,197,94,0.1); color: var(--success); }
.status-bar.error { background: rgba(239,68,68,0.1); color: var(--danger); }
.validate-result { margin-top: 16px; padding: 16px; background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); }
.validate-result.success { border-color: var(--success); }
.validate-result.error { border-color: var(--danger); }

/* ============ 二维码 ============ */
.qr-tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.qr-tab { padding: 8px 16px; border-radius: 6px; background: var(--bg2); border: 1px solid var(--border); color: var(--text2); cursor: pointer; }
.qr-tab.active { background: var(--primary); border-color: var(--primary); color: white; }
.qr-type-content { display: none; margin-bottom: 16px; }
.qr-type-content.active { display: block; }
.qr-type-content input, .qr-type-content textarea, .qr-type-content select { width: 100%; padding: 10px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); margin-bottom: 8px; font-size: 14px; }
.qr-options { display: flex; gap: 16px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
.qr-options label { font-size: 13px; color: var(--text2); }
.qr-options select, .qr-options input[type="color"] { padding: 6px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); }
.qr-preview { text-align: center; margin-top: 20px; }
.qr-preview canvas { border-radius: 8px; }
.qr-placeholder { padding: 40px; color: var(--text3); }

/* ============ 颜色转换 ============ */
.color-picker-area { display: flex; gap: 16px; align-items: center; margin-bottom: 24px; }
.color-preview { width: 80px; height: 80px; border-radius: 12px; border: 2px solid var(--border); }
.color-picker-area input[type="color"] { width: 60px; height: 40px; border: none; cursor: pointer; }
.color-values { margin-bottom: 24px; }
.color-row { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.color-row label { width: 50px; font-size: 13px; color: var(--text2); font-weight: 600; }
.color-row input { flex: 1; padding: 8px 12px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); font-family: monospace; }
.palette-grid { display: flex; gap: 8px; flex-wrap: wrap; }
.palette-item { width: 60px; height: 60px; border-radius: 8px; cursor: pointer; display: flex; align-items: flex-end; justify-content: center; padding-bottom: 4px; transition: transform .2s; }
.palette-item:hover { transform: scale(1.1); }
.palette-item span { font-size: 9px; color: white; text-shadow: 0 1px 2px rgba(0,0,0,0.5); }

/* ============ 时间戳 ============ */
.timestamp-box { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.timestamp-box h3 { font-size: 16px; margin-bottom: 12px; }
.timestamp-display { font-size: 32px; font-family: monospace; color: var(--primary); margin-bottom: 12px; text-align: center; padding: 16px; background: var(--bg); border-radius: 6px; }
.timestamp-box input { width: 100%; padding: 10px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; color: var(--text); margin-bottom: 8px; font-size: 14px; }
.result-display { margin-top: 12px; padding: 12px; background: var(--bg); border-radius: 6px; font-family: monospace; white-space: pre-wrap; word-break: break-all; }

/* ============ 密码生成器 ============ */
.password-config { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.password-config label { display: block; font-size: 14px; margin-bottom: 8px; }
.password-config input[type="range"] { width: 100%; margin-bottom: 16px; }
.checkbox-group { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 16px; }
.checkbox-group label { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text2); cursor: pointer; }
.password-result label { display: block; font-size: 13px; color: var(--text2); margin-bottom: 6px; }
.password-result input { width: 100%; padding: 12px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--primary); font-family: monospace; font-size: 16px; letter-spacing: 1px; }

/* ============ 字数统计 ============ */
#counter-input { width: 100%; min-height: 200px; background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; color: var(--text); font-size: 14px; resize: vertical; margin-bottom: 16px; }
.counter-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; }
.stat-item { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; text-align: center; }
.stat-value { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 12px; color: var(--text2); margin-top: 4px; }

/* ============ 文本对比 ============ */
.diff-result { margin-top: 16px; }
.diff-table { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.diff-col h4 { font-size: 14px; color: var(--text2); margin-bottom: 8px; }
.diff-line { padding: 4px 8px; font-family: monospace; font-size: 13px; border-radius: 4px; margin-bottom: 2px; }
.diff-removed { background: rgba(239,68,68,0.15); color: #fca5a5; }
.diff-added { background: rgba(34,197,94,0.15); color: #86efac; }

/* ============ 随机数 ============ */
.random-config { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.random-config label { font-size: 13px; color: var(--text2); }
.random-config input[type="number"] { width: 100px; padding: 8px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; color: var(--text); }
.random-config input[type="checkbox"] { margin-right: 4px; }
.random-result textarea { width: 100%; min-height: 100px; background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; color: var(--text); font-family: monospace; font-size: 14px; resize: vertical; }

/* ============ 单位转换 ============ */
.unit-tabs { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.unit-tab { padding: 8px 20px; border-radius: 6px; background: var(--bg2); border: 1px solid var(--border); color: var(--text2); cursor: pointer; }
.unit-tab.active { background: var(--primary); border-color: var(--primary); color: white; }
.unit-converter { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.unit-converter input { width: 150px; padding: 10px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); font-size: 16px; }
.unit-converter select { padding: 10px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); }
.unit-result { font-size: 24px; font-weight: 700; color: var(--primary); padding: 12px 20px; background: var(--bg2); border-radius: 6px; }

/* ============ 正则测试 ============ */
.regex-config { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.regex-config input { flex: 1; padding: 10px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); font-family: monospace; min-width: 120px; }
.regex-config input:last-of-type { flex: 0 0 80px; }
#regex-test-text { width: 100%; min-height: 150px; background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; color: var(--text); font-family: monospace; resize: vertical; margin-bottom: 16px; }
.regex-result { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.regex-match-info { font-size: 14px; color: var(--text2); margin-bottom: 8px; }
.regex-match-item { padding: 4px 8px; background: var(--bg); border-radius: 4px; margin-bottom: 4px; font-family: monospace; font-size: 13px; }

/* ============ 进制转换 ============ */
.binary-inputs { display: grid; gap: 12px; }
.binary-row { display: flex; align-items: center; gap: 12px; }
.binary-row label { width: 80px; font-size: 13px; color: var(--text2); font-weight: 600; }
.binary-row input { flex: 1; padding: 10px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); font-family: monospace; font-size: 16px; }

/* ============ UUID ============ */
.uuid-config { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.uuid-config label { font-size: 14px; color: var(--text2); }
.uuid-config input { width: 80px; padding: 8px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; color: var(--text); }
.uuid-result textarea { width: 100%; min-height: 120px; background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; color: var(--text); font-family: monospace; font-size: 14px; resize: vertical; }

/* ============ Cron ============ */
.cron-config { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.cron-config label { font-size: 14px; color: var(--text2); align-self: center; }
.cron-config input { flex: 1; min-width: 200px; padding: 10px; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); font-family: monospace; }
.cron-result { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.cron-presets h3 { font-size: 14px; margin-bottom: 12px; color: var(--text2); }
.cron-preset-list { display: flex; gap: 8px; flex-wrap: wrap; }

/* ============ JWT ============ */
.jwt-result { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.jwt-section { margin-bottom: 16px; }
.jwt-section:last-child { margin-bottom: 0; }
.jwt-section h4 { font-size: 14px; color: var(--text2); margin-bottom: 8px; }
.jwt-section pre { background: var(--bg); padding: 12px; border-radius: 6px; font-family: monospace; font-size: 13px; overflow-x: auto; white-space: pre-wrap; word-break: break-all; }

/* ============ 计算器 ============ */
#calc-display { width: 100%; padding: 16px; background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); color: var(--primary); font-size: 24px; font-family: monospace; text-align: right; margin-bottom: 12px; }
.calc-buttons { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; }
.calc-buttons .btn { padding: 12px; font-size: 16px; text-align: center; }

/* ============ 日期计算 ============ */
.date-box { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.date-box h3 { font-size: 16px; margin-bottom: 12px; }
.date-box input { width: 100%; padding: 10px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; color: var(--text); margin-bottom: 8px; font-size: 14px; }

/* ============ 图片压缩 ============ */
.image-upload { text-align: center; margin-bottom: 20px; }
.image-upload input[type="file"] { display: none; }
.upload-label { display: inline-block; padding: 40px 60px; background: var(--bg2); border: 2px dashed var(--border); border-radius: 12px; cursor: pointer; transition: border-color .2s; }
.upload-label:hover { border-color: var(--primary); }
.upload-icon { font-size: 40px; margin-bottom: 8px; }
.image-preview { display: flex; gap: 20px; align-items: flex-start; flex-wrap: wrap; }
.image-preview img { max-width: 300px; max-height: 300px; border-radius: 8px; border: 1px solid var(--border); }
.image-info { flex: 1; min-width: 250px; }
.image-info div { font-size: 14px; color: var(--text2); margin-bottom: 8px; }
.image-info label { display: block; font-size: 14px; color: var(--text2); margin-bottom: 4px; }
.image-info input[type="range"] { width: 100%; margin-bottom: 12px; }
.image-result { margin-top: 12px; font-size: 16px !important; color: var(--primary) !important; font-weight: 600; }
.image-info input[type="number"] { width: 100%; padding: 8px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; color: var(--text); margin-bottom: 8px; font-size: 14px; }
.image-info select { width: 100%; padding: 8px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; color: var(--text); margin-bottom: 8px; font-size: 14px; }

/* ============ 即将上线页面 ============ */
.coming-soon { text-align: center; padding: 60px 20px; }
.coming-soon-icon { font-size: 64px; margin-bottom: 20px; }
.coming-soon h2 { font-size: 28px; margin-bottom: 12px; }
.coming-soon p { color: var(--text2); font-size: 16px; margin-bottom: 24px; }

/* ============ Footer ============ */
footer { background: var(--bg2); border-top: 1px solid var(--border); padding: 24px 20px; margin-top: 40px; text-align: center; }
.footer-content { max-width: 1200px; margin: 0 auto; }
.footer-content p { color: var(--text3); font-size: 13px; }
.footer-links { margin-top: 8px; }
.footer-links a { color: var(--text3); margin: 0 12px; font-size: 13px; }
.footer-links a:hover { color: var(--text); }

/* ============ Toast ============ */
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: var(--bg3); color: var(--text); padding: 10px 24px; border-radius: 8px; font-size: 14px; opacity: 0; transition: opacity .3s; pointer-events: none; z-index: 9999; }
.toast.show { opacity: 1; }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
    .navbar { gap: 10px; }
    .search-box { order: 3; max-width: 100%; width: 100%; }
    .nav-links { order: 4; width: 100%; justify-content: center; }
}

@media (max-width: 768px) {
    .mobile-menu-btn { display: block; }
    .nav-links { display: none; width: 100%; padding-top: 12px; flex-direction: column; align-items: stretch; }
    .nav-links.mobile-open { display: flex; }
    .nav-dropdown { position: relative; }
    .nav-dropdown-menu { position: static; display: none; background: var(--bg); border: none; border-radius: 0; padding-left: 20px; box-shadow: none; max-height: none; }
    .nav-dropdown-menu.active { display: block; }
    .nav-link { text-align: left; }
    .json-panels { grid-template-columns: 1fr; }
    .diff-table { grid-template-columns: 1fr; }
    .tools-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
    .tool-card { padding: 16px 10px; }
    .tool-icon { font-size: 24px; }
    .tool-card h3 { font-size: 13px; }
    .calc-buttons { grid-template-columns: repeat(5, 1fr); }
    .hero h1 { font-size: 24px; }
    .category-title { font-size: 18px; }
    .tool-header h1 { font-size: 20px; }
    .image-preview { flex-direction: column; align-items: center; }
    .image-preview img { max-width: 100%; }
}

@media (max-width: 480px) {
    .tools-grid { grid-template-columns: repeat(2, 1fr); }
    .tool-card { padding: 14px 8px; }
    .tool-icon { font-size: 22px; }
    .calc-buttons { grid-template-columns: repeat(4, 1fr); }
    .unit-tabs { gap: 4px; }
    .unit-tab { padding: 6px 12px; font-size: 13px; }
    .json-toolbar { gap: 4px; }
    .json-toolbar .btn { padding: 6px 10px; font-size: 12px; }
}