/* 全局基础样式与主题色 */
:root {
	--bg: #0b0d12;
	--panel: #12151d;
	--text: #e6e8f0;
	--muted: #9aa3b2;
	--primary: #5b8cff;
	--primary-600: #3b6ef0;
	--border: #1f2430;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
	margin: 0;
	font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
	background: var(--bg);
	color: var(--text);
	line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
.muted { color: var(--muted); }

.container {
	max-width: 1120px;
	margin: 0 auto;
	padding: 0 16px;
}

/* 头部导航 */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(11,13,18,0.7); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.topbar { border-bottom: 1px solid var(--border); background: rgba(12,14,19,0.85); }
.topbar-inner { display: flex; gap: 16px; height: 36px; align-items: center; }
.topbar-link { color: var(--muted); font-size: 13px; }
.topbar-link:hover { color: var(--text); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.mainnav { gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; }
.logo-img { width: 28px; height: 28px; border-radius: 6px; object-fit: cover; }
.logo { font-weight: 700; letter-spacing: .2px; }
.nav-links { display: flex; gap: 20px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); }
.nav-toggle { display: none; background: none; color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; }
.actions { display: flex; gap: 8px; }

/* 二级导航（仿 PyCharm 顶部产品条） */
.subnav { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: rgba(12,14,19,0.85); }
.subnav-inner { display: flex; gap: 16px; height: 44px; align-items: center; overflow-x: auto; }
.subnav-link { color: var(--muted); font-size: 14px; white-space: nowrap; border-radius: 8px; padding: 6px 10px; }
.subnav-link:hover { color: var(--text); background: rgba(255,255,255,0.04); }

/* 英雄区 */
.hero { padding: 56px 0 32px; background: radial-gradient(1200px 600px at 70% -20%, #1b2233, transparent), linear-gradient(#0b0d12, #0b0d12); }
.hero-inner { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 32px; align-items: center; }
.hero-media { display: flex; align-items: center; justify-content: center; min-height: 280px; }
.hero-media img { max-width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--border); background: rgba(255,255,255,0.02); }
.hero h1 { margin: 0 0 12px; font-size: 40px; }
.hero-eyebrow { font-size: 28px; color: var(--muted); letter-spacing: .4px; text-transform: none; margin-bottom: 6px; }
.subtitle { color: var(--muted); margin-bottom: 20px; }
.cta-group { display: flex; gap: 12px; }
.btn { display: inline-block; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--panel); color: var(--text); font-weight: 600; }
.btn:hover { border-color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-600); border-color: var(--primary-600); }
.btn-secondary { background: transparent; }

.hero-media .media-placeholder { height: 280px; border: 1px dashed var(--border); border-radius: 16px; display: grid; place-items: center; color: var(--muted); background: rgba(255,255,255,0.02); }

/* 通用区块 */
.section { padding: 56px 0; }
.section-alt { background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0)); }
h2 { margin: 0 0 20px; font-size: 28px; }
h3 { margin: 0 0 8px; font-size: 18px; }

.grid { display: grid; gap: 16px; }
.features-grid { grid-template-columns: repeat(4, 1fr); }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 16px; }

.download-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.download-cards .card { display: flex; flex-direction: column; }
.download-cards .card p { flex: 1 1 auto; }
.download-cards .card .btn { align-self: flex-start; margin-top: 12px; }

/* FAQ */
.faq-list details { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 12px 16px; }
.faq-list details + details { margin-top: 12px; }
.faq-list summary { cursor: pointer; font-weight: 600; }
.faq-list p { color: var(--muted); margin: 8px 0 0; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); padding: 24px 0 40px; background: #0b0d12; }
.mega-footer { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; padding: 24px 0; }
.footer-group h4 { margin: 0 0 10px; font-size: 14px; color: #fff; }
.footer-group a { display: block; color: var(--muted); padding: 4px 0; font-size: 13px; }
.footer-group a:hover { color: var(--text); }

.footer-social { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.social-links { display: flex; gap: 12px; color: var(--muted); }
.locale { color: var(--muted); display: flex; align-items: center; gap: 8px; }
.locale .dot { opacity: .6; }

.footer-legal { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.legal-links { display: flex; gap: 12px; }
.legal-links a { color: var(--muted); }
.legal-links a:hover { color: var(--text); }

/* 响应式 */
@media (max-width: 960px) {
	.hero-inner { grid-template-columns: 1fr; }
	.features-grid { grid-template-columns: repeat(2, 1fr); }
	.download-cards { grid-template-columns: 1fr; }
	.mega-footer { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 720px) {
	.nav-toggle { display: inline-block; }
	/* 顶栏(36px) + 主导航(64px) ≈ 100px，留出间距 */
	.nav-links { position: absolute; top: 104px; right: 16px; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 10px; display: none; flex-direction: column; gap: 10px; min-width: 180px; }
	.nav-links.open { display: flex; }
	.actions { display: none; }
	.hero { padding-top: 40px; }
	.hero h1 { font-size: 30px; }
	.mega-footer { grid-template-columns: 1fr; }
	.footer-social, .footer-legal { flex-direction: column; gap: 8px; align-items: flex-start; }
}