:root {
	--bg: #0a0b10;
	--bg-2: #11131b;
	--bg-3: #171a24;
	--border: rgba(255, 255, 255, 0.08);
	--border-2: rgba(255, 255, 255, 0.14);
	--fg: #f3f5fb;
	--fg-2: #c2c7d6;
	--fg-3: #8b91a4;
	--fg-4: #5c6273;
	--brand: #6b5bff;
	--brand-2: #0e70c0;
	--accent: #38e0c4;
	--radius: 22px;
	--max: 1140px;
	font-synthesis: none;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
	font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
	background: var(--bg);
	color: var(--fg);
	line-height: 1.6;
	overflow-x: hidden;
	-webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* 背景光晕 */
.bg-orbs { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.orb { position: absolute; border-radius: 50%; filter: blur(120px); opacity: 0.45; }
.orb-1 { width: 540px; height: 540px; background: #4733ff; top: -160px; left: -120px; }
.orb-2 { width: 460px; height: 460px; background: #0e70c0; top: 30%; right: -160px; opacity: 0.35; }
.orb-3 { width: 420px; height: 420px; background: #00b894; bottom: -180px; left: 30%; opacity: 0.25; }

/* 导航 */
.nav {
	position: sticky; top: 0; z-index: 50;
	display: flex; align-items: center; justify-content: space-between;
	max-width: var(--max); margin: 0 auto; padding: 18px 24px;
	backdrop-filter: blur(14px);
}
.nav::before {
	content: ""; position: absolute; inset: 0; z-index: -1;
	background: linear-gradient(180deg, rgba(10, 11, 16, 0.85), rgba(10, 11, 16, 0));
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 34px; height: 34px; border-radius: 9px; }
.brand-name { font-weight: 700; font-size: 18px; letter-spacing: 0.5px; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { color: var(--fg-3); font-size: 15px; transition: color 0.2s; }
.nav-links a:hover { color: var(--fg); }

/* 按钮 */
.btn {
	display: inline-flex; align-items: center; gap: 9px;
	padding: 11px 22px; border-radius: 14px; font-weight: 600; font-size: 15px;
	border: 1px solid transparent; cursor: pointer; transition: all 0.25s ease;
	white-space: nowrap;
}
.btn-primary {
	background: linear-gradient(135deg, var(--brand-2), var(--brand));
	color: #fff; box-shadow: 0 18px 40px rgba(70, 60, 220, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 24px 54px rgba(70, 60, 220, 0.5); }
.btn-ghost {
	background: rgba(255, 255, 255, 0.05); color: var(--fg-2);
	border: 1px solid var(--border-2);
}
.btn-ghost:hover { color: var(--fg); border-color: rgba(255, 255, 255, 0.3); background: rgba(255, 255, 255, 0.09); }
.nav-links .btn-ghost { padding: 9px 18px; }

/* 首屏 */
.hero { position: relative; z-index: 1; max-width: var(--max); margin: 0 auto; padding: 70px 24px 90px; }
.hero-inner { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.eyebrow {
	display: inline-block; font-size: 12px; letter-spacing: 0.35em; text-transform: uppercase;
	color: var(--fg-4); margin-bottom: 22px;
}
.hero-title { font-size: clamp(38px, 5.4vw, 66px); font-weight: 300; line-height: 1.08; letter-spacing: -0.5px; }
.grad {
	background: linear-gradient(120deg, #8a7bff, #38e0c4 80%);
	-webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
	font-weight: 600;
}
.hero-sub { margin: 26px 0 32px; font-size: 18px; color: var(--fg-2); max-width: 540px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-actions.center { justify-content: center; }
.hero-meta { margin-top: 22px; font-size: 13px; color: var(--fg-4); }

.hero-visual { position: relative; }
.hero-glow {
	position: absolute; inset: -10% -6% -10% -6%;
	background: radial-gradient(circle at 50% 40%, rgba(107, 91, 255, 0.3), transparent 70%);
	filter: blur(30px);
}
.hero-banner {
	position: relative; width: 100%; border-radius: 26px;
	border: 1px solid var(--border-2);
	box-shadow: 0 50px 120px rgba(0, 0, 0, 0.7);
}

/* 通用区块 */
.section { position: relative; z-index: 1; max-width: var(--max); margin: 0 auto; padding: 84px 24px; }
.section-alt { position: relative; z-index: 1; }
.section-alt::before {
	content: ""; position: absolute; inset: 0; z-index: -1;
	background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
	border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.section-head { text-align: center; max-width: 680px; margin: 0 auto 52px; }
.kicker { font-size: 12px; letter-spacing: 0.35em; text-transform: uppercase; color: var(--brand); margin-bottom: 14px; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 40px); font-weight: 400; letter-spacing: -0.3px; }
.lead { margin-top: 14px; color: var(--fg-3); font-size: 17px; }

/* 卡片网格 */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
	background: linear-gradient(180deg, var(--bg-3), var(--bg-2));
	border: 1px solid var(--border); border-radius: var(--radius);
	padding: 28px; transition: transform 0.25s, border-color 0.25s;
}
.card:hover { transform: translateY(-4px); border-color: var(--border-2); }
.card-ico { font-size: 30px; margin-bottom: 16px; }
.card h3 { font-size: 19px; font-weight: 600; margin-bottom: 9px; }
.card p { color: var(--fg-3); font-size: 15px; }

/* 数据 */
.stats { text-align: center; }
.stat {
	background: rgba(255, 255, 255, 0.03); border: 1px solid var(--border);
	border-radius: var(--radius); padding: 26px 18px;
}
.stat-label { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--fg-4); }
.stat-value {
	margin: 12px 0 8px; font-size: 24px; font-weight: 600;
	background: linear-gradient(120deg, #fff, #b9b3ff);
	-webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-detail { font-size: 13px; color: var(--fg-3); }

/* 模型芯片 */
.chips { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; max-width: 820px; margin: 0 auto; }
.chip {
	padding: 10px 18px; border-radius: 999px; font-size: 14px; color: var(--fg-2);
	background: var(--bg-3); border: 1px solid var(--border-2); transition: all 0.2s;
}
.chip:hover { color: #fff; border-color: var(--brand); box-shadow: 0 8px 22px rgba(107, 91, 255, 0.25); }

/* 下载 */
.download { text-align: center; max-width: 720px; margin: 0 auto; }
.download-mark { width: 76px; height: 76px; border-radius: 18px; margin: 0 auto 24px; box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6); }
.download h2 { font-size: clamp(28px, 3.6vw, 42px); font-weight: 400; }
.download .hero-actions { margin-top: 28px; }

/* FAQ */
.faq { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq details {
	background: var(--bg-2); border: 1px solid var(--border); border-radius: 16px;
	padding: 18px 22px; transition: border-color 0.2s;
}
.faq details[open] { border-color: var(--border-2); }
.faq summary {
	cursor: pointer; font-weight: 600; font-size: 16px; list-style: none;
	display: flex; justify-content: space-between; align-items: center;
}
.faq summary::after { content: "+"; color: var(--fg-3); font-size: 22px; transition: transform 0.2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin-top: 12px; color: var(--fg-3); font-size: 15px; }

/* 页脚 */
.footer { position: relative; z-index: 1; border-top: 1px solid var(--border); margin-top: 40px; }
.footer-inner {
	max-width: var(--max); margin: 0 auto; padding: 34px 24px;
	display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 14px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.footer-brand img { width: 28px; height: 28px; border-radius: 8px; }
.footer-copy { color: var(--fg-4); font-size: 14px; }

/* 响应式 */
@media (max-width: 920px) {
	.hero-inner { grid-template-columns: 1fr; gap: 40px; }
	.hero-visual { order: -1; }
	.grid-3 { grid-template-columns: repeat(2, 1fr); }
	.grid-4 { grid-template-columns: repeat(2, 1fr); }
	.nav-links a:not(.btn) { display: none; }
}
@media (max-width: 560px) {
	.grid-3, .grid-4 { grid-template-columns: 1fr; }
	.hero { padding-top: 40px; }
	.footer-inner { flex-direction: column; text-align: center; }
}