/* 美国消费者洞察栏目 —— 沿用 zh.html 的设计系统 */
:root {
  --bg: #FFFFFF;
  --ink: #111111;
  --muted: #6F6F6F;
  --accent: #E8472B;
  --line: #111111;
  --max: 1240px;
  --read: 680px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent); color: #fff; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 32px; }
@media (max-width: 600px) { .wrap { padding: 0 20px; } }

a { color: inherit; text-decoration: none; }

.label {
  font-size: 12px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
}

/* nav */
nav { border-bottom: 2px solid var(--line); background: var(--bg); }
.nav-inner {
  max-width: var(--max); margin: 0 auto; padding: 22px 32px;
  display: flex; justify-content: space-between; align-items: center;
}
.nav-name { font-size: 14px; font-weight: 800; letter-spacing: .2em; }
.nav-links { display: flex; gap: 28px; }
.nav-links a { font-size: 13px; font-weight: 700; letter-spacing: .12em; transition: color .15s; }
.nav-links a:hover { color: var(--accent); }
.nav-links a.cta { color: var(--accent); }
.nav-links a.cta:hover { color: var(--ink); }
@media (max-width: 700px) {
  .nav-inner { padding: 18px 20px; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 12px; }
}

/* hero */
.hero { padding: 96px 0 72px; }
.hero .label { color: var(--accent); margin-bottom: 20px; display: block; }
h1 { font-size: clamp(32px, 5.6vw, 68px); font-weight: 900; line-height: 1.18; letter-spacing: .01em; }
h1 .accent { color: var(--accent); }
.hero-sub { margin-top: 28px; font-size: clamp(15px, 1.8vw, 17px); color: var(--muted); max-width: var(--read); line-height: 1.9; }
.hero-sub a { border-bottom: 1px solid var(--muted); }
@media (max-width: 860px) { .hero { padding: 60px 0 48px; } }

/* sections */
section { padding: 72px 0; }
.sechead { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 40px; }
h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 900; letter-spacing: .01em; }
.sechead .label { color: var(--accent); }

/* ——— 文章列表 ——— */
.list { border-top: 2px solid var(--line); }
.entry {
  display: grid; grid-template-columns: 150px 1fr; gap: 32px;
  border-bottom: 2px solid var(--line); padding: 30px 0; align-items: baseline;
  transition: background .15s;
}
.entry:hover { background: #FAF7F4; }
.entry .series { font-size: 12px; font-weight: 700; letter-spacing: .1em; color: var(--accent); }
.entry h3 { font-size: 21px; font-weight: 900; line-height: 1.35; margin-bottom: 8px; }
.entry:hover h3 { color: var(--accent); }
.entry p { color: #333; max-width: 640px; font-size: 14.5px; }
@media (max-width: 860px) {
  .entry { grid-template-columns: 1fr; gap: 10px; padding: 24px 0; }
  .entry h3 { font-size: 19px; }
}

/* ——— 文章正文 ——— */
article { padding: 90px 0 0; max-width: var(--read); }
article .series { color: var(--accent); display: block; margin-bottom: 20px; }
article h1 { font-size: clamp(28px, 4.4vw, 48px); line-height: 1.25; }
.lede {
  margin-top: 26px; padding-left: 20px; border-left: 3px solid var(--accent);
  font-size: 16.5px; line-height: 1.85; color: #333;
}
.prose { margin-top: 56px; }
.prose p { margin-bottom: 22px; font-size: 16px; line-height: 1.95; }
.prose h2 {
  font-size: 22px; font-weight: 900; line-height: 1.4;
  margin: 52px 0 20px; padding-top: 22px; border-top: 2px solid var(--line);
}
.prose strong { font-weight: 700; }
@media (max-width: 860px) { article { padding-top: 56px; } .prose p { font-size: 15.5px; } }

/* 来源 */
.sources { max-width: var(--read); padding: 56px 0 0; }
.sources .label { color: var(--accent); margin-bottom: 18px; display: block; }
.sources ul { list-style: none; border-top: 2px solid var(--line); }
.sources li {
  border-bottom: 1px solid #DDD; padding: 12px 0;
  font-size: 13.5px; line-height: 1.75; color: #444;
}
.sources a { border-bottom: 1px solid var(--muted); }
.sources a:hover { color: var(--accent); border-color: var(--accent); }
.sources .note { font-size: 13px; color: var(--muted); margin-top: 16px; }

/* 相关 */
.related { max-width: var(--read); padding: 56px 0 0; }
.related .label { color: var(--accent); margin-bottom: 18px; display: block; }
.related a {
  display: block; border-top: 2px solid var(--line); padding: 18px 0;
  font-size: 17px; font-weight: 900; line-height: 1.4;
}
.related a:last-child { border-bottom: 2px solid var(--line); }
.related a:hover { color: var(--accent); }

/* 文末转化条 */
.endband { max-width: var(--read); padding: 56px 0 90px; }
.endband p { color: #333; margin-bottom: 16px; }
.btn {
  display: inline-block; margin-top: 10px; padding: 16px 32px;
  font-size: 13px; font-weight: 700; letter-spacing: .12em;
  border: 2px solid var(--accent); background: var(--accent); color: #fff;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: var(--ink); border-color: var(--ink); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { background: var(--ink); color: #fff; }
.btn-row { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 10px; }

/* 方法论页 */
.steps { border-top: 2px solid var(--line); max-width: 900px; }
.step {
  border-bottom: 2px solid var(--line);
  display: grid; grid-template-columns: 60px 1fr; gap: 24px; padding: 30px 0;
}
.step .no { font-size: 12px; font-weight: 700; color: var(--accent); }
.step h3 { font-size: 20px; font-weight: 900; line-height: 1.35; margin-bottom: 12px; }
.step p { color: #333; max-width: 640px; margin-bottom: 12px; }
.step p:last-child { margin-bottom: 0; }
.srcgrid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.src { border-top: 2px solid var(--line); padding-top: 18px; }
.src h4 { font-size: 17px; font-weight: 900; margin-bottom: 10px; }
.src .can, .src .cant { font-size: 14px; line-height: 1.7; }
.src .can { color: #333; margin-bottom: 6px; }
.src .cant { color: var(--muted); }
@media (max-width: 860px) {
  .step { grid-template-columns: 36px 1fr; gap: 14px; }
  .srcgrid { grid-template-columns: 1fr; gap: 24px; }
}

/* footer */
footer { background: var(--ink); color: #fff; padding: 100px 0 48px; margin-top: 40px; }
footer .label { color: var(--accent); margin-bottom: 24px; }
.foot-big {
  display: block; font-size: clamp(32px, 6vw, 84px); font-weight: 900;
  line-height: 1.1; margin-bottom: 32px; transition: color .2s;
}
.foot-big .arrow { color: var(--accent); transition: transform .25s ease; display: inline-block; }
.foot-big:hover { color: var(--accent); }
.foot-big:hover .arrow { transform: translateX(12px); color: #fff; }
.foot-note { color: #999; margin-bottom: 56px; max-width: 520px; }
.foot-links { display: flex; gap: 32px; flex-wrap: wrap; margin-bottom: 72px; }
.foot-links a {
  font-size: 13px; font-weight: 700; letter-spacing: .1em;
  border-bottom: 2px solid #444; padding-bottom: 3px;
  transition: color .15s, border-color .15s;
}
.foot-links a:hover { color: var(--accent); border-color: var(--accent); }
.foot-bottom {
  display: flex; justify-content: space-between; font-size: 12px; color: #888;
  border-top: 1px solid #333; padding-top: 24px; flex-wrap: wrap; gap: 8px;
}

/* fade */
.fade { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.fade.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .fade { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

.entry .series .d { display: block; color: var(--muted); font-weight: 400; letter-spacing: 0; margin-top: 5px; font-size: 12px; }

/* ——— 配图 ——— */
figure { margin: 40px 0; }
figure img { display: block; width: auto; max-width: 100%; max-height: 520px; height: auto; border: 2px solid var(--line); }
figcaption { font-size: 13px; color: var(--muted); margin-top: 10px; line-height: 1.65; max-width: var(--read); }
.lead-figure { margin: 40px 0 0; }