/* ============ 基础 ============ */
:root {
  --ink: #1d1d1f;
  --ink-soft: #6e6e73;
  --ink-faint: #86868b;
  --paper: #f5f5f7;
  --white: #ffffff;
  --line: #d2d2d7;
  --line-soft: #e8e8ed;
  --accent: #1d1d1f;
  --accent-dark: #000000;
  --accent-soft: #f5f5f7;
  --dark: #0e0e10;
  --dark-soft: #161618;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, .05);
  --shadow-md: 0 18px 44px rgba(0, 0, 0, .12);
  --radius: 22px;
  --container: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro SC", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 70px; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 860px; }

.section { padding: 110px 0; }
.section-alt { background: var(--paper); }
.section-white { background: var(--white); }

.section-head { text-align: center; max-width: 760px; margin: 0 auto 64px; }
.section-eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .22em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-head h2 {
  font-size: clamp(34px, 4.4vw, 52px);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.15;
}
.section-lead { margin-top: 18px; color: var(--ink-soft); font-size: 18px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 600;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform .2s ease, background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-solid {
  background: var(--ink);
  color: #fff;
}
.btn-solid:hover { background: #000; }
.btn-light {
  background: var(--white);
  color: var(--ink);
}
.btn-light:hover { box-shadow: 0 12px 30px rgba(255, 255, 255, .22); }
.btn-outline {
  background: transparent;
  color: #f5f5f7;
  border-color: rgba(245, 245, 247, .55);
}
.btn-outline:hover { border-color: #fff; color: #fff; }
.btn-block { width: 100%; }

/* ============ 顶部导航 ============ */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  color: #f5f5f7;
  background: transparent;
  transition: background .3s ease, color .3s ease, box-shadow .3s ease, border-color .3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(245, 245, 247, .78);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  color: var(--ink);
  border-bottom-color: rgba(0, 0, 0, .06);
}

.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }

.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: rgba(255, 255, 255, .12);
  color: #f5f5f7;
  flex: none;
  transition: background .3s ease, color .3s ease;
}
.site-header.scrolled .brand-mark { background: var(--ink); color: #fff; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 17px; font-weight: 700; letter-spacing: .05em; }
.brand-text small { font-size: 10.5px; color: currentColor; opacity: .62; letter-spacing: .12em; }
.brand-logo { display: inline-flex; align-items: center; flex: none; width: 44px; height: 44px; }
.brand-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 10px;
}
.site-header .brand-logo img { box-shadow: 0 0 0 1px rgba(255, 255, 255, .28); }
.site-footer .brand-logo { width: 40px; height: 40px; }
.site-footer .brand-logo img { box-shadow: 0 0 0 1px rgba(0, 0, 0, .08); }

.main-nav { display: flex; align-items: center; gap: 34px; }
.main-nav a { font-size: 14.5px; font-weight: 500; color: currentColor; opacity: .82; transition: opacity .2s ease; }
.main-nav a:hover { opacity: 1; }
.main-nav .nav-cta {
  opacity: 1;
  background: #fff;
  color: var(--ink);
  padding: 9px 22px;
  border-radius: 980px;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .12);
}
.site-header.scrolled .nav-cta { background: var(--ink); color: #fff; }
.main-nav .nav-cta:hover { opacity: .9; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; padding: 8px; cursor: pointer; color: currentColor; }
.nav-toggle span { width: 22px; height: 2px; background: currentColor; border-radius: 2px; transition: transform .25s ease, opacity .25s ease; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ 首屏（深色科技风） ============ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 130px 0 96px;
  overflow: hidden;
  background: var(--dark);
  color: #f5f5f7;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto;
  height: 90%;
  background:
    radial-gradient(52% 42% at 72% 12%, rgba(255, 255, 255, .08), transparent 70%),
    radial-gradient(46% 40% at 16% 34%, rgba(255, 255, 255, .05), transparent 70%);
  filter: blur(10px);
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .5;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 30%, #000 10%, transparent 78%);
  mask-image: radial-gradient(70% 60% at 50% 30%, #000 10%, transparent 78%);
}

.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }

.hero-copy { padding-top: 10px; }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .18em;
  color: #a1a1a6;
  margin-bottom: 28px;
}
.hero-eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #a1a1a6; }

.hero h1 {
  font-size: clamp(44px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -.025em;
}
.hero-sub { margin-top: 26px; font-size: 19px; color: #a1a1a6; max-width: 500px; }

.hero-actions { display: flex; gap: 16px; margin-top: 40px; flex-wrap: wrap; }
.hero-link {
  display: inline-block;
  margin-top: 26px;
  font-size: 15px;
  font-weight: 600;
  color: #a1a1a6;
  transition: opacity .2s ease, transform .2s ease;
}
.hero-link:hover { opacity: .85; transform: translateY(2px); }

.hero-stats { display: flex; gap: 44px; margin-top: 60px; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 30px; font-weight: 700; color: #f5f5f7; letter-spacing: -.01em; }
.hero-stats sup { font-size: 15px; }
.hero-stats span { font-size: 13px; color: #86868b; margin-top: 3px; }

.hero-visual { position: relative; height: 480px; }
.visual-card {
  position: absolute;
  border-radius: 28px;
  box-shadow: 0 40px 90px rgba(0, 0, 0, .45);
  background-size: cover;
  background-position: center;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, .12);
}
.visual-card .tag {
  background: rgba(20, 20, 22, .72);
  color: #f5f5f7;
  font-size: 12.5px;
  font-weight: 600;
  padding: 7px 15px;
  border-radius: 980px;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}
.visual-card-main {
  inset: 34px 0 0 30px;
  aspect-ratio: 4 / 3;
  background-image:
    linear-gradient(155deg, rgba(255, 255, 255, .07), rgba(0, 0, 0, .28)),
    linear-gradient(135deg, #3a3834, #26241f 55%, #16151a);
}
.visual-card-1 {
  width: 44%;
  top: 0;
  right: 0;
  aspect-ratio: 1 / .85;
  background-image:
    linear-gradient(150deg, rgba(255, 255, 255, .05), rgba(0, 0, 0, .24)),
    linear-gradient(200deg, #46433c, #2c2a25 60%, #1b1a20);
}
.visual-card-2 {
  width: 40%;
  bottom: 4px;
  right: 10%;
  aspect-ratio: 1 / .7;
  background-image:
    linear-gradient(140deg, rgba(255, 255, 255, .06), rgba(0, 0, 0, .30)),
    linear-gradient(120deg, #35322c, #221f1b 60%, #121118);
}
.visual-stamp {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: linear-gradient(145deg, #3a3a3c, #17171a);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 13.5px;
  font-weight: 700;
  text-align: center;
  line-height: 1.35;
  box-shadow: 0 18px 44px rgba(0, 0, 0, .35);
  z-index: 2;
}
.visual-stamp sup { font-size: 10.5px; }

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  width: 1px;
  height: 44px;
  background: linear-gradient(180deg, rgba(245, 245, 247, .7), transparent);
  z-index: 1;
}

/* ============ 关于我们 ============ */
.about-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 64px; align-items: start; }
.about-intro p { font-size: 18px; color: var(--ink-soft); }
.about-intro p strong { color: var(--ink); font-weight: 700; }
.reg-badge {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  margin-top: 26px;
  padding: 13px 18px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  border: 1px solid rgba(0, 0, 0, .12);
  border-radius: 14px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
}
.reg-badge svg { width: 22px; height: 22px; flex: none; }
.reg-badge strong { font-weight: 800; letter-spacing: .02em; }

.advantage-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.advantage-list .advantage:last-child:nth-child(odd) { grid-column: 1 / -1; }
.advantage {
  background: var(--paper);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
}
.advantage:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); background: #fff; }
.advantage-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.advantage h3 { font-size: 17px; font-weight: 700; letter-spacing: -.01em; }
.advantage p { font-size: 14.5px; color: var(--ink-soft); margin-top: 9px; }

/* ============ 服务项目 ============ */
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.service-card {
  position: relative;
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 30px 32px;
  border: 1px solid transparent;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(0, 0, 0, .18); }
.service-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: var(--ink);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  transition: background .25s ease, color .25s ease;
}
.service-card:hover .service-icon { background: var(--accent); color: #fff; }
.service-card h3 { font-size: 19px; font-weight: 700; letter-spacing: -.01em; }
.service-card p { font-size: 14.5px; color: var(--ink-soft); margin-top: 10px; }

/* ============ 装修流程 ============ */
.process-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px 22px;
  counter-reset: step;
}
.process-item {
  position: relative;
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px 28px 28px 78px;
  box-shadow: var(--shadow-sm);
  counter-increment: step;
  transition: transform .25s ease, box-shadow .25s ease;
}
.process-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.process-item::before {
  content: "0" counter(step);
  position: absolute;
  left: 24px;
  top: 30px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--accent-dark);
  width: 38px;
  height: 38px;
  border: 1.5px solid rgba(0, 0, 0, .2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
}
.process-item h3 { font-size: 17px; font-weight: 700; letter-spacing: -.01em; }
.process-item p { font-size: 14px; color: var(--ink-soft); margin-top: 8px; }

/* ============ 案例展示 ============ */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.case-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.case-cover {
  position: relative;
  height: 260px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: flex-end;
  padding: 20px;
}
.case-cover .chip {
  background: rgba(255, 255, 255, .92);
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 980px;
}
.case-body { padding: 26px 30px 30px; }
.case-body h3 { font-size: 21px; font-weight: 700; letter-spacing: -.01em; }
.case-meta { display: flex; gap: 20px; font-size: 13px; color: var(--ink-faint); margin-top: 10px; }
.case-meta span::before { content: "·"; margin-right: 20px; color: var(--line); }
.case-meta span:first-child::before { content: none; }
.case-body p { font-size: 15px; color: var(--ink-soft); margin-top: 14px; }

/* 案例封面（克制的渐变色块） */
.cover-1 { background-image: linear-gradient(155deg, rgba(255,255,255,.08), rgba(0,0,0,.18)), linear-gradient(135deg, #d9d9d9, #a6a6a6 55%, #575757); }
.cover-2 { background-image: linear-gradient(150deg, rgba(255,255,255,.08), rgba(0,0,0,.14)), linear-gradient(200deg, #e5e5e5, #b3b3b3 55%, #6b6b6b); }
.cover-3 { background-image: linear-gradient(140deg, rgba(255,255,255,.10), rgba(0,0,0,.22)), linear-gradient(120deg, #c4c4c4, #8f8f8f 60%, #4a4a4a); }
.cover-4 { background-image: linear-gradient(155deg, rgba(255,255,255,.10), rgba(0,0,0,.18)), linear-gradient(160deg, #d2d2d2, #9a9a9a 55%, #555555); }

/* ============ 客户评价 ============ */
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.testimonial {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px 30px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: transform .25s ease, box-shadow .25s ease;
}
.testimonial:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.stars { color: var(--accent); letter-spacing: 3px; font-size: 15px; margin-bottom: 16px; }
.testimonial p { font-size: 15px; color: var(--ink-soft); }
.testimonial footer { margin-top: 22px; font-weight: 600; font-size: 14px; color: var(--ink); }

/* ============ 常见问题 ============ */
.faq-list { border-top: 1px solid var(--line-soft); }
.faq-item { border-bottom: 1px solid var(--line-soft); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 4px;
  background: none;
  border: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: color .2s ease;
}
.faq-question:hover { color: var(--accent-dark); }
.faq-question .faq-icon {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink-soft);
  position: relative;
  transition: transform .28s ease, background .28s ease, color .28s ease;
}
.faq-question .faq-icon::before,
.faq-question .faq-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 2px;
  background: currentColor;
  transform: translate(-50%, -50%);
  border-radius: 2px;
}
.faq-question .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--accent); color: #fff; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .32s ease; }
.faq-answer p { padding: 0 44px 26px 4px; font-size: 15.5px; color: var(--ink-soft); }

/* ============ 联系预约 ============ */
.contact-card {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  background: var(--paper);
  border-radius: 28px;
  padding: 60px;
}
.contact-info .section-eyebrow { margin-bottom: 16px; }
.contact-info h2 { font-size: clamp(28px, 3vw, 38px); font-weight: 700; letter-spacing: -.02em; line-height: 1.2; }
.contact-note { margin-top: 18px; color: var(--ink-soft); font-size: 15.5px; max-width: 480px; }

.contact-meta { margin-top: 36px; display: flex; flex-direction: column; gap: 18px; }
.contact-meta li { display: flex; align-items: center; gap: 15px; }
.contact-meta svg { width: 44px; height: 44px; padding: 10px; background: #fff; border-radius: 14px; color: var(--accent-dark); box-shadow: var(--shadow-sm); flex: none; }
.contact-meta span { display: flex; flex-direction: column; line-height: 1.4; }
.contact-meta small { font-size: 12px; color: var(--ink-faint); }
.contact-meta strong { font-size: 15.5px; font-weight: 600; }
.contact-meta a { color: inherit; transition: color .2s ease; }
.contact-meta a:hover { color: var(--accent-dark); }

.contact-form {
  background: var(--white);
  border-radius: 22px;
  padding: 34px;
  box-shadow: var(--shadow-md);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form label { display: block; margin-bottom: 16px; }
.contact-form label > span { display: block; font-size: 13px; font-weight: 600; margin-bottom: 7px; color: var(--ink-soft); }
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid transparent;
  border-radius: 13px;
  padding: 13px 15px;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
  appearance: none;
}
.contact-form textarea { resize: vertical; min-height: 90px; }
.search-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin: -4px 0 16px;
}
.area-hint { font-size: 12.5px; color: var(--ink-faint); }
.area-hint.ok { color: var(--ink-soft); }
.area-hint.ok strong { color: var(--ink); }
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  background: #fff;
  border-color: rgba(0, 0, 0, .35);
  box-shadow: 0 0 0 4px rgba(0, 0, 0, .06);
}
.contact-form input.invalid { border-color: #c0553f; }
.form-note { margin-top: 14px; font-size: 12.5px; color: var(--ink-faint); text-align: center; }
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; pointer-events: none; }

/* ============ 地圖 ============ */
.map-wrap {
  margin-top: 26px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: 26px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.map-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 26px;
  flex-wrap: wrap;
}
.map-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.map-head h3 { font-size: 17px; font-weight: 700; letter-spacing: -.01em; }
.btn-sm { padding: 10px 20px; font-size: 13.5px; }
.map-embed iframe { display: block; width: 100%; height: 380px; border: 0; }

/* ============ 页脚 ============ */
.site-footer { background: var(--paper); border-top: 1px solid var(--line-soft); color: var(--ink-soft); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 56px;
}
.footer-brand .brand-text strong { color: var(--ink); }
.footer-brand .brand-mark { background: var(--ink); color: #fff; }
.footer-brand p { margin-top: 20px; font-size: 14px; max-width: 360px; }
.footer-col h3 { color: var(--ink); font-size: 13px; font-weight: 700; letter-spacing: .1em; margin-bottom: 18px; }
.footer-col li { margin-bottom: 11px; }
.footer-col a { font-size: 13.5px; transition: color .2s ease; }
.footer-col a:hover { color: var(--accent-dark); }
.footer-contact p { font-size: 13.5px; margin-bottom: 10px; }
.footer-bottom {
  border-top: 1px solid var(--line-soft);
  padding-top: 24px;
  padding-bottom: 30px;
  font-size: 12.5px;
  color: var(--ink-faint);
  text-align: center;
}

/* ============ 提示 & 动画 ============ */
.toast {
  position: fixed;
  left: 50%;
  bottom: 36px;
  transform: translate(-50%, 20px);
  background: var(--ink);
  color: #f5f5f7;
  padding: 14px 28px;
  border-radius: 980px;
  font-size: 14.5px;
  box-shadow: 0 18px 44px rgba(0, 0, 0, .28);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease, transform .3s ease;
  z-index: 200;
  max-width: 90vw;
  text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.reveal { opacity: 0; transform: translateY(28px); transition: opacity .75s ease, transform .75s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .service-grid, .process-list, .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-inner { grid-template-columns: 1fr; gap: 24px; }
  .hero { min-height: auto; padding: 140px 0 110px; }
  .hero-visual { height: 380px; max-width: 640px; margin: 0 auto; width: 100%; }
  .contact-card { grid-template-columns: 1fr; padding: 44px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 84px 0; }
  .section-head { margin-bottom: 48px; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    inset: 64px 0 auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(245, 245, 247, .98);
    color: var(--ink);
    padding: 8px 24px 20px;
    border-bottom: 1px solid var(--line-soft);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform .3s ease, opacity .3s ease;
    box-shadow: 0 24px 44px rgba(0, 0, 0, .12);
  }
  .main-nav.open { transform: none; opacity: 1; pointer-events: auto; }
  .main-nav a { padding: 13px 0; border-bottom: 1px solid rgba(210, 210, 215, .6); font-size: 16px; opacity: 1; }
  .main-nav .nav-cta { margin-top: 16px; text-align: center; border-bottom: 0; background: var(--ink); color: #fff; }
  .site-header.scrolled .nav-cta { background: var(--ink); color: #fff; }

  .hero h1 { font-size: clamp(38px, 9vw, 52px); }
  .hero-stats { gap: 30px; flex-wrap: wrap; }
  .hero-visual { height: 320px; }
  .service-grid, .process-list, .testimonial-grid, .case-grid { grid-template-columns: 1fr; }
  .advantage-list { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-card { padding: 34px 26px; }
  .contact-form { padding: 26px 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .map-embed iframe { height: 300px; }
}

@media (max-width: 480px) {
  .brand-text small { display: none; }
  .hero-actions .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}