/* ============================================================
   云南鑫硅新能源有限公司 — 官网样式
   设计基调：黑白灰为主，鑫硅绿 / 能量橙仅作点缀
   ============================================================ */

:root {
  --ink:        #111111;
  --ink-2:      #1A1A1A;
  --graphite:   #27272A;
  --text:       #52525B;
  --text-light: #71717A;
  --muted:      #A1A1AA;
  --line:       #E4E4E7;
  --bg-soft:    #FAFAFA;
  --white:      #FFFFFF;
  --green:      #518353;
  --orange:     #F4AE39;

  --max:        1200px;
  --radius:     4px;
  --nav-h:      72px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--white);
  line-height: 1.8;
  font-size: 16px;
  letter-spacing: .3px;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- 通用标题 ---------- */
.section { padding: 96px 0; }
.section--soft { background: var(--bg-soft); }
.section--dark { background: var(--ink); color: #D4D4D8; }

.section-head { margin-bottom: 56px; }
.section-head.center { text-align: center; }

.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 14px;
  font-weight: 600;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--graphite);
  line-height: 1.4;
  letter-spacing: .5px;
}
.section--dark .section-title { color: var(--white); }

.section-sub {
  margin-top: 14px;
  font-size: 16px;
  color: var(--text-light);
  max-width: 720px;
  line-height: 1.9;
}
.section-head.center .section-sub { margin-left: auto; margin-right: auto; }
.section--dark .section-sub { color: #A1A1AA; }

.title-rule {
  width: 48px; height: 3px;
  background: var(--green);
  margin-top: 20px;
}
.section-head.center .title-rule { margin-left: auto; margin-right: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .25s ease;
  letter-spacing: .5px;
}
.btn--primary { background: var(--ink); color: var(--white); }
.btn--primary:hover { background: var(--green); }
.btn--accent { background: var(--orange); color: var(--ink); }
.btn--accent:hover { background: var(--ink); color: var(--white); }
.btn--ghost { background: transparent; color: var(--white); border-color: rgba(255,255,255,.55); }
.btn--ghost:hover { background: var(--white); color: var(--ink); }
.btn--outline { background: transparent; color: var(--graphite); border-color: var(--line); }
.btn--outline:hover { border-color: var(--ink); color: var(--ink); }
.btn--light { background: var(--white); color: var(--ink); }
.btn--light:hover { background: var(--orange); }

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  background: rgba(255,255,255,0);
  border-bottom: 1px solid transparent;
  transition: all .3s ease;
}
.site-header.is-scrolled {
  background: rgba(255,255,255,.96);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom-color: var(--line);
}
.site-header.is-open { background: var(--white); }

.nav { height: var(--nav-h); display: flex; align-items: center; justify-content: space-between; }

.brand { display: flex; align-items: center; gap: 12px; }
.brand img { width: 42px; height: 42px; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name {
  font-size: 17px; font-weight: 800; color: var(--ink); letter-spacing: 1px;
}
.is-scrolled .brand-name, .is-open .brand-name { color: var(--ink); }
.brand-name { color: var(--white); }
.brand-en { font-size: 10px; letter-spacing: 2px; color: var(--muted); text-transform: uppercase; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu > li { position: relative; }
.nav-menu a {
  display: block;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  transition: color .2s ease;
}
.is-scrolled .nav-menu a, .is-open .nav-menu a { color: var(--graphite); }
.nav-menu a:hover { color: var(--green); }
.nav-menu a.is-active { color: var(--green); }
.nav-menu a.is-active::after {
  content: "";
  position: absolute;
  left: 18px; right: 18px; bottom: 2px;
  height: 2px; background: var(--green);
}

.nav-phone {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px;
  border: 1px solid rgba(255,255,255,.45);
  border-radius: var(--radius);
  color: var(--white);
  font-size: 14px; font-weight: 700;
  transition: all .25s ease;
}
.is-scrolled .nav-phone, .is-open .nav-phone { border-color: var(--line); color: var(--ink); }
.nav-phone:hover { background: var(--green); border-color: var(--green); color: var(--white) !important; }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  background: none; border: none; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--white);
  transition: all .3s ease;
}
.is-scrolled .nav-toggle span, .is-open .nav-toggle span { background: var(--ink); }
.is-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.is-open .nav-toggle span:nth-child(2) { opacity: 0; }
.is-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 640px;
  display: flex; align-items: center;
  background: var(--ink) center/cover no-repeat;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(10,10,10,.88) 0%, rgba(10,10,10,.68) 55%, rgba(10,10,10,.35) 100%);
}
.hero-inner { position: relative; z-index: 2; padding: 160px 0 100px; width: 100%; }
.hero-tag {
  display: inline-block;
  font-size: 12px; letter-spacing: 3px; font-weight: 700;
  color: var(--orange);
  border: 1px solid rgba(244,174,57,.5);
  padding: 6px 14px; border-radius: 2px;
  margin-bottom: 26px;
}
.hero h1 {
  font-size: 46px;
  font-weight: 800;
  color: var(--white);
  line-height: 1.35;
  letter-spacing: 1px;
  max-width: 820px;
}
.hero h1 em { font-style: normal; color: var(--orange); }
.hero-lead {
  margin-top: 22px;
  font-size: 17px;
  color: #D4D4D8;
  max-width: 640px;
  line-height: 2;
}
.hero-actions { margin-top: 40px; display: flex; gap: 14px; flex-wrap: wrap; }

.hero-meta {
  margin-top: 56px;
  display: flex; gap: 48px; flex-wrap: wrap;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,.16);
}
.hero-meta div span {
  display: block;
  font-size: 30px; font-weight: 900; color: var(--white); line-height: 1.1;
  letter-spacing: -.5px;
}
.hero-meta div p { font-size: 13px; color: #A1A1AA; margin-top: 6px; letter-spacing: 1px; }

/* 内页页头（非首页） */
.page-hero {
  position: relative;
  padding: 168px 0 88px;
  background: var(--ink) center/cover no-repeat;
  overflow: hidden;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(10,10,10,.9), rgba(10,10,10,.6));
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 {
  font-size: 38px; font-weight: 800; color: var(--white);
  letter-spacing: 1px; line-height: 1.4;
}
.page-hero p { margin-top: 16px; color: #A1A1AA; font-size: 16px; max-width: 680px; }

.breadcrumb {
  font-size: 13px; color: #A1A1AA; margin-bottom: 18px; letter-spacing: .5px;
}
.breadcrumb a { color: #D4D4D8; }
.breadcrumb a:hover { color: var(--orange); }
.breadcrumb span { margin: 0 8px; color: #52525B; }

/* ============================================================
   业务板块卡片
   ============================================================ */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.service-card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 40px 32px 36px;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.service-card::after {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--green);
  transform: scaleY(0); transform-origin: bottom;
  transition: transform .3s ease;
}
.service-card:hover { border-color: #D4D4D8; box-shadow: 0 12px 36px -16px rgba(0,0,0,.14); }
.service-card:hover::after { transform: scaleY(1); }

.service-num {
  font-size: 44px; font-weight: 900; color: var(--line);
  line-height: 1; letter-spacing: -2px; margin-bottom: 14px;
}
.service-card h3 {
  font-size: 20px; font-weight: 800; color: var(--graphite);
  margin-bottom: 14px; letter-spacing: .5px;
}
.service-card p { font-size: 15px; color: var(--text); line-height: 1.9; }
.service-tags { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 8px; }
.service-tags span {
  font-size: 12px; color: var(--text-light);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 4px 10px; border-radius: 2px;
}

/* 能力清单 */
.capability-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 48px; }
.capability-list li {
  padding: 18px 0 18px 26px;
  border-bottom: 1px solid var(--line);
  position: relative;
  font-size: 15px;
  color: var(--text);
}
.capability-list li::before {
  content: ""; position: absolute; left: 0; top: 27px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green);
}

/* ============================================================
   数据条
   ============================================================ */
.stats-band { background: var(--ink); padding: 56px 0; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item { padding: 8px 12px; }
.stat-num {
  font-size: 40px; font-weight: 900; color: var(--white);
  line-height: 1.1; letter-spacing: -1px;
}
.stat-num em { font-style: normal; font-size: 20px; color: var(--orange); margin-left: 4px; }
.stat-label { margin-top: 10px; font-size: 13px; color: #A1A1AA; letter-spacing: 1.5px; }

/* ============================================================
   业绩表格
   ============================================================ */
.table-wrap {
  border: 1px solid var(--line);
  overflow-x: auto;
}
table.data-table { width: 100%; border-collapse: collapse; min-width: 560px; background: var(--white); }
table.data-table th {
  background: var(--graphite);
  color: var(--white);
  font-size: 14px; font-weight: 700;
  text-align: left;
  padding: 14px 20px;
  letter-spacing: .5px;
}
table.data-table td {
  padding: 14px 20px;
  font-size: 15px;
  color: var(--text);
  border-bottom: 1px solid var(--line);
}
table.data-table tbody tr:nth-child(even) { background: var(--bg-soft); }
table.data-table td.num { font-weight: 800; color: var(--graphite); }
table.data-table tfoot td { background: var(--bg-soft); font-weight: 800; color: var(--graphite); }

.note {
  margin-top: 18px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.9;
  border-left: 3px solid var(--line);
  padding-left: 14px;
}

/* ============================================================
   资质荣誉
   ============================================================ */
.qual-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.qual-item {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 10px;
  cursor: pointer;
  transition: all .25s ease;
  text-align: center;
}
.qual-item:hover { border-color: var(--green); transform: translateY(-3px); }
.qual-item img {
  width: 100%; height: 180px; object-fit: contain; background: var(--bg-soft);
}
.qual-item p { margin-top: 12px; font-size: 13px; color: var(--text-light); font-weight: 600; }

.honor-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 32px; }
.honor-list li {
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  padding: 14px 18px;
  font-size: 14px;
  color: var(--text);
  font-weight: 600;
}

/* ============================================================
   项目案例
   ============================================================ */
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.project-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  background: var(--ink);
}
.project-item img {
  width: 100%; height: 260px; object-fit: cover;
  transition: transform .5s ease, opacity .3s ease;
  opacity: .92;
}
.project-item:hover img { transform: scale(1.06); opacity: 1; }
.project-caption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 22px 20px;
  background: linear-gradient(to top, rgba(0,0,0,.85), rgba(0,0,0,0));
  color: var(--white);
}
.project-caption strong { display: block; font-size: 16px; font-weight: 700; }
.project-caption span { font-size: 12px; color: #D4D4D8; letter-spacing: .5px; }
.project-item--wide { grid-column: span 2; }
.project-item--wide img { height: 260px; }

/* ============================================================
   合作伙伴
   ============================================================ */
.partner-list {
  display: flex; flex-wrap: wrap; gap: 12px;
}
.partner-list span {
  font-size: 14px;
  color: var(--text);
  border: 1px solid var(--line);
  padding: 8px 16px;
  border-radius: 2px;
  background: var(--white);
  transition: all .25s ease;
}
.partner-list span:hover { border-color: var(--green); color: var(--green); }

/* ============================================================
   新闻
   ============================================================ */
.news-list { border-top: 1px solid var(--line); }
.news-item {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  transition: background .25s ease;
}
.news-item:hover { background: var(--bg-soft); }
.news-cat {
  font-size: 12px; font-weight: 700; color: var(--green);
  letter-spacing: 1px;
}
.news-item h3 {
  font-size: 17px; font-weight: 700; color: var(--graphite);
  line-height: 1.6;
}
.news-item:hover h3 { color: var(--green); }
.news-item p { font-size: 14px; color: var(--text-light); margin-top: 6px; }
.news-go { font-size: 13px; color: var(--muted); letter-spacing: 1px; white-space: nowrap; }
.news-item:hover .news-go { color: var(--orange); }

.news-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card {
  border: 1px solid var(--line);
  background: var(--white);
  padding: 28px 26px;
  transition: all .3s ease;
  display: flex; flex-direction: column;
}
.news-card:hover { border-color: var(--green); box-shadow: 0 12px 32px -18px rgba(0,0,0,.2); }
.news-card .news-cat { margin-bottom: 12px; }
.news-card h3 { font-size: 17px; font-weight: 700; color: var(--graphite); line-height: 1.6; }
.news-card p { font-size: 14px; color: var(--text-light); margin-top: 10px; flex: 1; }
.news-card .news-go { margin-top: 18px; }

/* ============================================================
   CTA
   ============================================================ */
.cta-band {
  background: var(--ink);
  padding: 80px 0;
  text-align: center;
}
.cta-band h2 {
  font-size: 30px; font-weight: 800; color: var(--white); letter-spacing: 1px;
}
.cta-band p { margin-top: 16px; color: #A1A1AA; font-size: 16px; }
.cta-band .btn { margin-top: 32px; }

/* ============================================================
   关于页：时间线 / 双栏
   ============================================================ */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split--reverse .split-media { order: -1; }
.split-media img { width: 100%; border: 1px solid var(--line); }
.split-body h2 { font-size: 28px; font-weight: 800; color: var(--graphite); line-height: 1.5; }
.split-body p { margin-top: 18px; color: var(--text); line-height: 2; }
.split-body .btn { margin-top: 28px; }

.timeline { border-left: 1px solid var(--line); padding-left: 32px; }
.timeline-item { position: relative; padding-bottom: 36px; }
.timeline-item::before {
  content: ""; position: absolute; left: -37px; top: 8px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--white); border: 3px solid var(--green);
}
.timeline-year { font-size: 15px; font-weight: 900; color: var(--green); letter-spacing: 1px; }
.timeline-item h4 { font-size: 17px; font-weight: 700; color: var(--graphite); margin-top: 6px; }
.timeline-item p { font-size: 14px; color: var(--text-light); margin-top: 6px; line-height: 1.9; }

.info-table { width: 100%; border-collapse: collapse; }
.info-table th, .info-table td {
  text-align: left; padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px; vertical-align: top;
}
.info-table th { width: 140px; color: var(--graphite); font-weight: 700; }
.info-table td { color: var(--text); }

/* ============================================================
   联系页
   ============================================================ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
.contact-card {
  border: 1px solid var(--line);
  padding: 32px 28px;
  background: var(--white);
}
.contact-card h3 { font-size: 18px; font-weight: 800; color: var(--graphite); margin-bottom: 18px; }
.contact-card ul li { padding: 10px 0; font-size: 15px; color: var(--text); border-bottom: 1px dashed var(--line); }
.contact-card ul li:last-child { border-bottom: none; }
.contact-card strong { color: var(--graphite); display: inline-block; min-width: 68px; }

.form-row { margin-bottom: 20px; }
.form-row label {
  display: block; font-size: 14px; font-weight: 700; color: var(--graphite); margin-bottom: 8px;
}
.form-row input, .form-row textarea, .form-row select {
  width: 100%; padding: 12px 14px;
  border: 1px solid var(--line);
  font-family: var(--font); font-size: 15px; color: var(--text);
  background: var(--white); border-radius: var(--radius);
  transition: border-color .2s ease;
}
.form-row input:focus, .form-row textarea:focus, .form-row select:focus {
  outline: none; border-color: var(--green);
}
.form-row textarea { min-height: 120px; resize: vertical; }
.form-note { font-size: 13px; color: var(--muted); margin-top: 12px; line-height: 1.8; }

.map-embed {
  margin-top: 32px;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 32px;
  text-align: center;
  color: var(--text-light);
  font-size: 14px;
}

.qr-block {
  display: flex; gap: 24px; align-items: center;
  border: 1px solid var(--line); padding: 24px; background: var(--bg-soft);
  margin-top: 28px;
}
.qr-block img { width: 120px; height: 120px; }
.qr-block h4 { font-size: 16px; font-weight: 800; color: var(--graphite); }
.qr-block p { font-size: 14px; color: var(--text-light); margin-top: 6px; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer { background: var(--ink); color: #A1A1AA; padding: 72px 0 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand img { width: 54px; height: 54px; margin-bottom: 18px; }
.footer-brand h4 { font-size: 18px; font-weight: 800; color: var(--white); letter-spacing: 1px; }
.footer-brand p { font-size: 14px; color: #A1A1AA; margin-top: 14px; line-height: 1.9; }

.footer-col h5 {
  font-size: 14px; font-weight: 700; color: var(--white);
  margin-bottom: 18px; letter-spacing: 1px;
}
.footer-col ul li { padding: 7px 0; font-size: 14px; }
.footer-col ul li a { color: #A1A1AA; transition: color .2s ease; }
.footer-col ul li a:hover { color: var(--orange); }
.footer-contact li { color: #A1A1AA; }

.footer-bottom {
  border-top: 1px solid #2A2A2A;
  padding: 24px 0;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
  font-size: 13px; color: #71717A;
}
.footer-bottom a { color: #71717A; }
.footer-bottom a:hover { color: var(--orange); }

/* ============================================================
   灯箱
   ============================================================ */
.lightbox {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,.92);
  display: none;
  align-items: center; justify-content: center;
  padding: 40px;
}
.lightbox.is-active { display: flex; }
.lightbox img { max-width: 100%; max-height: 88vh; object-fit: contain; }
.lightbox-close {
  position: absolute; top: 24px; right: 32px;
  width: 44px; height: 44px; border: 1px solid rgba(255,255,255,.4);
  background: transparent; color: var(--white);
  font-size: 24px; cursor: pointer; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.lightbox-close:hover { background: var(--white); color: var(--ink); }
.lightbox-caption {
  position: absolute; bottom: 28px; left: 0; right: 0;
  text-align: center; color: #D4D4D8; font-size: 14px;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .service-grid { grid-template-columns: 1fr 1fr; }
  .qual-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 0 24px;
    border-bottom: 1px solid var(--line);
    display: none;
    box-shadow: 0 12px 24px -12px rgba(0,0,0,.18);
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
  }
  .nav-menu.is-open { display: flex; }
  .nav-menu a { padding: 14px 24px; color: var(--graphite) !important; border-bottom: 1px solid var(--line); }
  .nav-menu a.is-active::after { display: none; }
  .nav-phone { display: none; }
  .nav-toggle { display: flex; }

  .hero { min-height: 560px; }
  .hero-inner { padding: 140px 0 80px; }
  .hero h1 { font-size: 32px; }
  .hero-lead { font-size: 15px; }
  .hero-meta { gap: 28px; }
  .hero-meta div span { font-size: 26px; }

  .page-hero { padding: 140px 0 64px; }
  .page-hero h1 { font-size: 28px; }

  .section { padding: 64px 0; }
  .section-title { font-size: 26px; }

  .service-grid { grid-template-columns: 1fr; }
  .capability-list { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; gap: 32px 16px; }
  .stat-num { font-size: 32px; }
  .qual-grid { grid-template-columns: 1fr 1fr; }
  .honor-list { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .project-item--wide { grid-column: span 1; }
  .news-cards { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; gap: 10px; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split--reverse .split-media { order: 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { justify-content: center; text-align: center; }
  .brand-name, .nav-menu a { color: var(--graphite); }
}

@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .hero h1 { font-size: 26px; }
  .hero-actions .btn { width: 100%; }
  .stats { grid-template-columns: 1fr 1fr; }
  .qual-grid { grid-template-columns: 1fr; }
  .btn { padding: 12px 22px; font-size: 14px; }
}

/* ============================================================
   FAQ 常见问题（AI 问答收录友好）
   ============================================================ */
.faq-list { max-width: 860px; margin-top: 36px; }
.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.faq-item:first-child { border-top: 1px solid var(--line); }
.faq-q {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
  line-height: 1.6;
  padding-left: 14px;
  border-left: 3px solid var(--green);
}
.faq-a {
  font-size: 15px;
  line-height: 1.9;
  color: var(--text);
  margin: 0;
  padding-left: 17px;
  text-align: justify;
}
@media (max-width: 768px) {
  .faq-q { font-size: 16px; }
  .faq-a { font-size: 14px; }
}