/* ============================================================
   ARTOFUL 全站样式 — 对标 Ray-Ban Meta / Even Realities 官网质感
   近黑底 + 白 + 电光蓝强调色，移动端优先，零框架依赖
   ============================================================ */
:root {
  --bg: #0b0b0d;
  --bg-soft: #131318;
  --card: #1a1a21;
  --text: #f4f4f6;
  --muted: #9a9aa6;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --line: #26262e;
  --radius: 16px;
  --maxw: 1120px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", "Manrope", -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 导航 ---------- */
header.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11,11,13,.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 800; font-size: 1.25rem; letter-spacing: .06em; }
.logo span { color: var(--accent); }
nav.links { display: flex; gap: 28px; font-size: .95rem; color: var(--muted); }
nav.links a:hover { color: var(--text); }
.nav-cta { padding: 8px 18px; border-radius: 999px; background: var(--accent); color: #fff; font-weight: 600; font-size: .9rem; }
.nav-cta:hover { background: var(--accent-hover); }
@media (max-width: 820px) { nav.links { display: none; } }

/* ---------- Hero ---------- */
.hero { padding: 88px 0 72px; text-align: center; }
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800; letter-spacing: -.02em; line-height: 1.1;
}
.hero h1 .hl { color: var(--accent); }
.hero p.sub { max-width: 620px; margin: 20px auto 36px; color: var(--muted); font-size: 1.15rem; }
.hero-img {
  margin: 56px auto 0; max-width: 900px; aspect-ratio: 16/9;
  background: linear-gradient(135deg, #1b1b24, #0f0f14 60%);
  border: 1px solid var(--line); border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: .9rem;
}
.hero-img img { width: 100%; height: 100%; object-fit: cover; border-radius: var(--radius); }

/* ---------- CTA 按钮 ---------- */
.btn {
  display: inline-block; padding: 16px 36px; border-radius: 999px;
  font-weight: 700; font-size: 1.05rem; transition: transform .15s ease, background .15s ease;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); margin-left: 12px; }
.btn-ghost:hover { border-color: var(--muted); }
.cta-note { display: block; margin-top: 14px; color: var(--muted); font-size: .85rem; }

/* ---------- 通用区块 ---------- */
section { padding: 88px 0; }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: .14em; text-transform: uppercase; font-size: .8rem; }
h2.title { font-size: clamp(1.7rem, 4vw, 2.5rem); font-weight: 800; letter-spacing: -.01em; margin: 10px 0 14px; }
p.lead { color: var(--muted); max-width: 640px; font-size: 1.05rem; }

/* 三卖点 */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
@media (max-width: 820px) { .grid-3 { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 28px; }
.card .icon { font-size: 1.8rem; margin-bottom: 14px; }
.card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: .95rem; }

/* 场景叙事：左右交替 */
.scene { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 56px 0; }
.scene:nth-child(even) .scene-img { order: 2; }
@media (max-width: 820px) { .scene { grid-template-columns: 1fr; gap: 24px; } .scene:nth-child(even) .scene-img { order: 0; } }
.scene-img { aspect-ratio: 4/3; border-radius: var(--radius); background: var(--bg-soft); border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: .85rem; overflow: hidden; }
.scene-img img { width: 100%; height: 100%; object-fit: cover; }
.scene h3 { font-size: 1.6rem; margin-bottom: 12px; }
.scene p { color: var(--muted); }

/* 对比表 */
table.compare { width: 100%; border-collapse: collapse; margin-top: 40px; background: var(--card); border-radius: var(--radius); overflow: hidden; }
table.compare th, table.compare td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--line); font-size: .95rem; }
table.compare th { color: var(--muted); font-weight: 600; font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; }
table.compare td.us { color: var(--text); font-weight: 600; }
table.compare .price { color: var(--accent); font-weight: 800; font-size: 1.1rem; }

/* 规格折叠 */
details.spec { background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 12px; }
details.spec summary { cursor: pointer; padding: 18px 24px; font-weight: 600; }
details.spec .body { padding: 0 24px 20px; color: var(--muted); }
details.spec .body ul { list-style: none; }
details.spec .body li { padding: 6px 0; border-bottom: 1px dashed var(--line); }

/* 信任条 */
.trust { display: flex; flex-wrap: wrap; gap: 32px; justify-content: center; padding: 40px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.trust .item { text-align: center; min-width: 160px; }
.trust .item strong { display: block; font-size: 1.05rem; }
.trust .item span { color: var(--muted); font-size: .85rem; }

/* FAQ */
.faq details { max-width: 720px; margin: 0 auto 12px; }

/* 邮件订阅 */
.subscribe { background: var(--bg-soft); border-radius: var(--radius); padding: 56px 32px; text-align: center; }
.subscribe form { display: flex; gap: 12px; max-width: 460px; margin: 24px auto 0; }
.subscribe input[type=email] { flex: 1; padding: 14px 18px; border-radius: 999px; border: 1px solid var(--line); background: var(--bg); color: var(--text); font-size: 1rem; }
@media (max-width: 560px) { .subscribe form { flex-direction: column; } }

/* 中置 CTA 区 */
.center-cta { text-align: center; }

/* 页脚 */
footer { border-top: 1px solid var(--line); padding: 48px 0 32px; color: var(--muted); font-size: .85rem; }
footer .cols { display: flex; flex-wrap: wrap; gap: 48px; margin-bottom: 32px; }
footer h4 { color: var(--text); margin-bottom: 12px; }
footer a:hover { color: var(--text); }

/* 隐私遮罩徽章 */
.badge-privacy { display: inline-block; background: rgba(59,130,246,.12); color: var(--accent); border: 1px solid rgba(59,130,246,.3); padding: 6px 14px; border-radius: 999px; font-size: .85rem; margin-top: 20px; }