:root {
	--brand: #2563eb;
	--brand-dark: #1d4ed8;
	--brand-light: #eff4ff;
	--accent: #0ea5e9;
	--bg: #f4f6fb;
	--card: #ffffff;
	--text: #1f2937;
	--text-muted: #6b7280;
	--border: #e5e7eb;
	--radius: 14px;
	--shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 14px rgba(0,0,0,.05);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
	margin: 0;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
	background: var(--bg);
	color: var(--text);
	line-height: 1.6;
}
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 头部 ===== */
.site-header {
	background: #fff;
	border-bottom: 1px solid var(--border);
	position: sticky;
	top: 0;
	z-index: 50;
}
.header-inner {
	display: flex;
	align-items: center;
	gap: 24px;
	padding: 14px 20px;
}
.site-logo {
	display: flex;
	align-items: center;
	gap: 8px;
	font-weight: 700;
	font-size: 20px;
	color: var(--text);
	text-decoration: none;
}
.site-logo:hover { text-decoration: none; }
.logo-mark { font-size: 22px; }
.logo-text em { color: var(--brand); font-style: normal; }

.main-nav ul {
	display: flex;
	list-style: none;
	margin: 0;
	padding: 0;
	gap: 6px;
	flex-wrap: wrap;
}
.main-nav a {
	display: block;
	padding: 7px 12px;
	border-radius: 8px;
	color: var(--text);
	font-weight: 500;
	font-size: 15px;
}
.main-nav a:hover { background: var(--brand-light); color: var(--brand-dark); text-decoration: none; }

.header-search { margin-left: auto; display: flex; align-items: center; gap: 8px; background: var(--bg); border: 1px solid var(--border); border-radius: 999px; padding: 6px 14px; }
.header-search svg { color: var(--text-muted); flex-shrink: 0; }
.header-search input { border: none; background: transparent; outline: none; font-size: 14px; width: 170px; }
.nav-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; }

/* ===== 首页 Hero ===== */
.hero {
	background: linear-gradient(135deg, #2563eb 0%, #0ea5e9 100%);
	color: #fff;
	padding: 52px 0 46px;
	text-align: center;
}
.hero h1 { margin: 0 0 8px; font-size: 34px; }
.hero-sub { margin: 0; font-size: 16px; opacity: .92; }
.page-wrap { padding: 30px 0 60px; }

/* ===== 分类区块 ===== */
.cat-section { margin-bottom: 42px; }
.cat-head { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.cat-icon { font-size: 26px; }
.cat-head h2 { margin: 0; font-size: 24px; }
.cat-head p { margin: 0 0 0 auto; color: var(--text-muted); font-size: 14px; }

/* ===== 工具卡片网格 ===== */
.tools-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
	gap: 14px;
}
.tool-card {
	display: flex;
	flex-direction: column;
	align-items: center;
	text-align: center;
	gap: 6px;
	background: var(--card);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	padding: 22px 16px;
	color: var(--text);
	box-shadow: var(--shadow);
	transition: transform .15s, box-shadow .15s, border-color .15s;
}
.tool-card:hover {
	transform: translateY(-3px);
	box-shadow: 0 6px 20px rgba(37,99,235,.15);
	border-color: var(--brand);
	text-decoration: none;
}
.tool-icon { font-size: 30px; }
.tool-name { font-weight: 600; font-size: 15px; }
.tool-desc { font-size: 12.5px; color: var(--text-muted); }

/* ===== 工具页 ===== */
.tool-hero { background: #fff; border-bottom: 1px solid var(--border); padding: 26px 0; }
.breadcrumb { font-size: 13px; color: var(--text-muted); margin-bottom: 12px; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb span { margin: 0 6px; }
.tool-title { display: flex; align-items: center; gap: 14px; }
.tool-icon.large { font-size: 40px; }
.tool-title h1 { margin: 0; font-size: 28px; }
.tool-sub { color: var(--text-muted); margin: 6px 0 0; }

.tool-wrap { padding: 30px 0 60px; }
.tool-content {
	background: var(--card);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	padding: 30px;
	box-shadow: var(--shadow);
	max-width: 760px;
}

/* ===== 表单 / 计算器 ===== */
.calc-form { display: grid; gap: 14px; }
.calc-actions { display: flex; gap: 12px; margin-top: 4px; }
.input-suffix { display: flex; align-items: center; gap: 8px; background: #fbfcfe; border: 1px solid var(--border); border-radius: 9px; padding: 0 12px; }
.input-suffix input { border: none; background: transparent; padding: 10px 0; flex: 1; outline: none; font-size: 15px; }
.input-suffix span { color: var(--text-muted); font-size: 14px; }
.calc-field { display: grid; gap: 6px; }
.calc-field label { font-size: 14px; font-weight: 500; }
.calc-field input, .calc-field select {
	padding: 10px 12px;
	border: 1px solid var(--border);
	border-radius: 9px;
	font-size: 15px;
	background: #fbfcfe;
}
.calc-field input:focus, .calc-field select:focus { outline: none; border-color: var(--brand); background: #fff; }
.calc-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.btn {
	display: inline-block;
	background: var(--brand);
	color: #fff;
	border: none;
	border-radius: 9px;
	padding: 11px 22px;
	font-size: 15px;
	font-weight: 600;
	cursor: pointer;
}
.btn:hover { background: var(--brand-dark); }
.btn.secondary { background: #eef2f6; color: var(--text); }
.btn.secondary:hover { background: #e2e8f0; }

.result-box {
	margin-top: 20px;
	padding: 20px;
	background: var(--brand-light);
	border: 1px solid #cfe0ff;
	border-radius: var(--radius);
}
.result-box .result-title { font-size: 13px; color: var(--brand-dark); font-weight: 600; margin-bottom: 8px; }
.result-box .result-num { font-size: 30px; font-weight: 700; color: var(--brand-dark); }
.result-box .result-num small { font-size: 16px; font-weight: 500; color: var(--text-muted); }
.result-box p { margin: 6px 0 0; font-size: 14px; }
.notes { font-size: 13px; color: var(--text-muted); margin-top: 16px; }

/* ===== 页脚 ===== */
.site-footer { background: #0f172a; color: #cbd5e1; padding: 34px 0 0; margin-top: 30px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; padding-bottom: 24px; }
.footer-brand { display: flex; align-items: center; gap: 8px; font-weight: 600; color: #fff; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: #cbd5e1; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.footer-copy { border-top: 1px solid #1e293b; padding: 14px 20px; text-align: center; font-size: 13px; color: #64748b; }

/* ===== 响应式 ===== */
@media (max-width: 820px) {
	.header-inner { flex-wrap: wrap; }
	.main-nav { order: 3; width: 100%; display: none; }
	.main-nav ul { flex-wrap: wrap; }
	.nav-toggle { display: block; margin-left: auto; }
	.header-inner.open .main-nav { display: block; }
	.header-search { margin-left: 0; flex: 1; }
	.tools-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
	.calc-row { grid-template-columns: 1fr; }
}
.entry-content img { max-width: 100%; height: auto; }

/* 文本处理工具的文本域 */
.calc-area { width: 100%; min-height: 120px; box-sizing: border-box; padding: 8px 10px; border: 1px solid var(--border, #e5e7eb); border-radius: 8px; font-size: 14px; font-family: inherit; line-height: 1.5; resize: vertical; }
.calc-area:focus { outline: none; border-color: var(--accent, #3b82f6); }