/* =================================================================
   科研答辩 PPT 定制工作室 — Visual System v2 (Blue-White)
   配色：深蓝主轴 + 白 + 浅蓝灰
   节奏：浅蓝 — 白 — 浅蓝 — 白 — 浅蓝 — 白 — 深蓝
   ================================================================= */

:root {
  /* —— 配色 —— */
  --c-deep:        #0B2E59;     /* 主深蓝（品牌） */
  --c-deep-2:      #123F78;     /* 次深蓝 */
  --c-blue:        #2F6DB5;     /* 强调蓝 */
  --c-blue-soft:   #5E8DC9;     /* 浅强调 */
  --c-bg:          #ffffff;     /* 主白底 */
  --c-bg-tint:     #F3F7FC;     /* 浅蓝底 */
  --c-bg-tint-2:   #EDF3F9;     /* 更深一点的浅蓝灰 */
  --c-line:        #D8E4F2;     /* 主分割线 */
  --c-line-soft:   #E8EFF7;     /* 极淡分割 */
  --c-line-dark:   #B8CADF;     /* 强一点的分割 */
  --c-ink:         #0B2E59;     /* 标题深蓝 */
  --c-text:        #24364B;     /* 正文深灰蓝 */
  --c-muted:       #6E7D90;     /* 辅助文字 */
  --c-deeper:      #061B36;     /* 比深蓝再深一档（footer） */

  /* —— 阴影 —— */
  --shadow-card:    0 2px 6px rgba(11, 46, 89, 0.04), 0 8px 24px rgba(11, 46, 89, 0.06);
  --shadow-card-hv: 0 4px 12px rgba(11, 46, 89, 0.08), 0 16px 40px rgba(11, 46, 89, 0.14);
  --shadow-soft:    0 4px 20px rgba(11, 46, 89, 0.08);
  --shadow-dark:    0 24px 60px rgba(0, 0, 0, 0.32);
  --glow-blue:      0 0 0 4px rgba(47, 109, 181, 0.10);

  /* —— 尺寸 —— */
  --container:     1200px;
  --gutter:        24px;
  --r-sm:          4px;
  --r-md:          6px;
  --r-lg:          10px;
  --r-pill:        999px;

  --t-base:        17px;
  --lh-base:       1.75;
}

/* ============ Reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

/* 锚点跳转时让 section 顶部不被 fixed nav 遮挡 */
section[id], footer.footer { scroll-margin-top: 80px; }
body {
  margin: 0;
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: var(--t-base);
  line-height: var(--lh-base);
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "palt";
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
ul { list-style: none; padding: 0; margin: 0; }
h1, h2, h3, h4 { margin: 0; color: var(--c-ink); font-weight: 700; line-height: 1.3; letter-spacing: -0.01em; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  position: relative;
}
.only-mobile { display: none; }
@media (max-width: 720px) { .only-mobile { display: inline; } }

/* ============ Section Head（统一的"分区感"） ============ */
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 68px;
  position: relative;
}
.section-head__num {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.4em;
  color: var(--c-blue);
  margin-bottom: 20px;
  display: inline-flex;
  align-items: center;
  gap: 14px;
}
.section-head__num::before,
.section-head__num::after {
  content: "";
  display: inline-block;
  width: 36px;
  height: 1px;
  background: var(--c-blue-soft);
  opacity: 0.7;
}
.section-head__title {
  font-size: clamp(28px, 3.4vw, 42px);
  color: var(--c-ink);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  position: relative;
  padding-bottom: 22px;
}
.section-head__title::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 56px;
  height: 3px;
  background: var(--c-blue);
  transform: translateX(-50%);
  border-radius: 2px;
}
.section-head__sub {
  margin: 0;
  font-size: 16px;
  color: var(--c-muted);
  line-height: 1.7;
}

/* 深色背景下的 section-head 反色 */
.section-head--dark .section-head__num { color: var(--c-blue-soft); }
.section-head--dark .section-head__num::before,
.section-head--dark .section-head__num::after { background: rgba(255, 255, 255, 0.25); opacity: 1; }
.section-head--dark .section-head__title { color: #fff; }
.section-head--dark .section-head__title::after { background: var(--c-blue-soft); }
.section-head--dark .section-head__sub { color: rgba(255, 255, 255, 0.72); }

/* ============ Top Nav ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease, background .25s ease;
}
.nav.is-scrolled {
  border-bottom-color: var(--c-line);
  box-shadow: 0 2px 16px rgba(11, 46, 89, 0.06);
  background: rgba(255, 255, 255, 0.96);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--c-ink);
}
.nav__brand-mark {
  display: inline-block;
  background: var(--c-deep);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  padding: 6px 11px;
  letter-spacing: 0.05em;
  border-radius: var(--r-sm);
  position: relative;
}
.nav__brand-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--r-sm);
  background: linear-gradient(135deg, rgba(255,255,255,0.12), transparent 60%);
  pointer-events: none;
}
.nav__brand-text {
  font-size: 16px;
  letter-spacing: 0.02em;
}
.nav__menu {
  display: flex;
  gap: 36px;
  margin-left: auto;
  margin-right: 24px;
}
.nav__menu a {
  font-size: 15px;
  color: var(--c-text);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  transition: color .2s ease;
}
.nav__menu a::after {
  content: "";
  position: absolute;
  left: 50%; right: 50%; bottom: -4px;
  height: 2px;
  background: var(--c-blue);
  transition: left .25s ease, right .25s ease;
  border-radius: 2px;
}
.nav__menu a:hover { color: var(--c-ink); }
.nav__menu a:hover::after,
.nav__menu a.is-current::after { left: 0; right: 0; }
.nav__menu a.is-current { color: var(--c-ink); }

/* —— 按钮：主/次 —— */
.btn,
.nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 11px 24px;
  border-radius: var(--r-sm);
  transition: all .25s ease;
  white-space: nowrap;
}
.btn--primary,
.nav__cta {
  background: var(--c-deep);
  color: #fff;
  box-shadow: 0 4px 14px rgba(11, 46, 89, 0.22);
}
.btn--primary:hover,
.nav__cta:hover {
  background: var(--c-deep-2);
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(11, 46, 89, 0.30);
}
.btn--secondary {
  background: #fff;
  color: var(--c-deep);
  border: 1.5px solid var(--c-deep);
}
.btn--secondary:hover {
  background: var(--c-bg-tint);
  border-color: var(--c-deep-2);
}

.nav__toggle {
  display: none;
  width: 36px; height: 36px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0 6px;
}
.nav__toggle span {
  display: block;
  height: 2px;
  background: var(--c-ink);
  transition: transform .25s ease, opacity .2s ease;
}

/* ============ Hero（浅蓝渐变 + 网格 + 光晕 + 几何） ============ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 0 100px;
  isolation: isolate;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 55% 45% at 18% 28%, rgba(47, 109, 181, 0.22) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 85% 70%, rgba(11, 46, 89, 0.16) 0%, transparent 65%),
    linear-gradient(180deg, #EDF3F9 0%, #F3F7FC 45%, #ffffff 100%);
}
.hero__bg::before {
  /* 科技感网格 */
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(11, 46, 89, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(11, 46, 89, 0.08) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, #000 0%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, #000 0%, transparent 85%);
  opacity: 0.7;
}
.hero__bg::after {
  /* 角落几何装饰 */
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  right: -120px;
  bottom: -120px;
  border: 1px solid rgba(11, 46, 89, 0.10);
  transform: rotate(45deg);
  border-radius: 12px;
}

.hero__inner {
  position: relative;
  text-align: center;
}
.hero__eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.42em;
  color: var(--c-blue);
  margin-bottom: 36px;
  position: relative;
  display: inline-block;
  padding: 0 30px;
}
.hero__eyebrow::before,
.hero__eyebrow::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 56px;
  height: 1px;
  background: var(--c-blue-soft);
}
.hero__eyebrow::before { left: -56px; }
.hero__eyebrow::after { right: -56px; }

.hero__title {
  font-family: "Noto Serif SC", "Songti SC", "STKaiti", serif;
  font-size: clamp(48px, 7vw, 92px);
  font-weight: 900;
  color: var(--c-ink);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 36px;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.6);
}
.hero__title-accent {
  color: var(--c-deep);
  position: relative;
  display: inline-block;
}
.hero__title-accent::after {
  content: "";
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: -8px;
  height: 6px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-deep));
  border-radius: 3px;
  opacity: 0.92;
}
.hero__lead {
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 500;
  color: var(--c-ink);
  line-height: 1.75;
  margin: 0 0 32px;
}
.hero__lead em {
  font-style: normal;
  font-weight: 700;
  color: var(--c-deep);
  letter-spacing: 0.02em;
}
.hero__sub {
  font-size: 15px;
  color: var(--c-text);
  letter-spacing: 0.18em;
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 10px 28px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  backdrop-filter: blur(6px);
}
.hero__sub::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--c-blue);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(47, 109, 181, 0.15);
}

.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: -60px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--c-muted);
}
.hero__scroll-line {
  width: 1px;
  height: 56px;
  background: linear-gradient(180deg, var(--c-line-dark), transparent);
  position: relative;
  overflow: hidden;
}
.hero__scroll-line::after {
  content: "";
  position: absolute;
  top: -40%;
  left: 0;
  width: 100%;
  height: 40%;
  background: var(--c-blue);
  animation: scrollLine 2.4s ease-in-out infinite;
}
@keyframes scrollLine {
  0%   { top: -40%; }
  100% { top: 100%; }
}

/* ============ Services — 白底，卡片顶部蓝条 ============ */
.services {
  padding: 140px 0 120px;
  background: var(--c-bg);
  position: relative;
}
.services__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.service-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  padding: 52px 32px 44px;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  overflow: hidden;
}
.service-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--c-blue);
  transition: background .3s ease, height .3s ease;
}
.service-card::after {
  content: "";
  position: absolute;
  top: 18px;
  right: 18px;
  width: 22px;
  height: 22px;
  border: 1px solid var(--c-line);
  border-radius: 3px;
  transform: rotate(45deg);
  transition: border-color .3s ease;
}
.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--c-deep);
  box-shadow: var(--shadow-card-hv);
}
.service-card:hover::before {
  background: var(--c-deep);
  height: 4px;
}
.service-card:hover::after {
  border-color: var(--c-blue);
}
.service-card__num {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--c-blue);
  letter-spacing: 0.1em;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--c-line);
  transition: color .3s ease;
}
.service-card:hover .service-card__num { color: var(--c-deep); }
.service-card__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 22px;
  letter-spacing: 0.01em;
}
.service-card__list {
  font-size: 15px;
  color: var(--c-text);
  line-height: 2.1;
}
.service-card__list li {
  position: relative;
  padding-left: 18px;
}
.service-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--c-blue);
}

/* ============ Stats — 浅蓝带，内置白卡 ============ */
.stats {
  padding: 140px 0 120px;
  background: var(--c-bg-tint);
  position: relative;
}
.stats::before {
  /* 顶部细分隔 */
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line) 20%, var(--c-line) 80%, transparent);
}
.stats::after {
  /* 底部细分隔 */
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line) 20%, var(--c-line) 80%, transparent);
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}
.stat {
  text-align: center;
  padding: 56px 24px 48px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-blue);
  border-radius: var(--r-md);
  position: relative;
  box-shadow: var(--shadow-card);
  transition: transform .3s ease, box-shadow .3s ease;
}
.stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hv);
}
.stat__num {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(48px, 5.5vw, 76px);
  font-weight: 900;
  color: var(--c-deep);
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
}
.stat__plus {
  font-size: 0.55em;
  font-weight: 700;
  color: var(--c-blue);
  vertical-align: top;
  margin-left: 4px;
}
.stat__label {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-ink);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 14px;
}
.stat__label::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 28px;
  height: 1px;
  background: var(--c-line-dark);
  transform: translateX(-50%);
}
.stat__desc {
  font-size: 13px;
  color: var(--c-muted);
  letter-spacing: 0.08em;
}
.stats__foot {
  text-align: center;
  font-size: 16px;
  color: var(--c-text);
  margin: 0;
  letter-spacing: 0.05em;
  font-weight: 500;
}

/* ============ Cases — 白底，卡片浅蓝边 + hover 深蓝 ============ */
.cases {
  padding: 140px 0 120px;
  background: var(--c-bg);
  position: relative;
}
.cases::after {
  /* 底部很淡的过渡蓝灰 */
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 80px;
  background: linear-gradient(180deg, transparent, var(--c-bg-tint-2));
  pointer-events: none;
}
.cases__filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 56px;
}
.filter-btn {
  padding: 11px 24px;
  font-size: 14px;
  color: var(--c-text);
  font-weight: 500;
  border: 1px solid var(--c-line);
  background: #fff;
  border-radius: var(--r-pill);
  transition: all .25s ease;
  letter-spacing: 0.02em;
}
.filter-btn:hover {
  border-color: var(--c-blue);
  color: var(--c-deep);
  background: var(--c-bg-tint);
}
.filter-btn.is-active {
  background: var(--c-deep);
  color: #fff;
  border-color: var(--c-deep);
  box-shadow: 0 6px 16px rgba(11, 46, 89, 0.24);
}

.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  position: relative;
  z-index: 1;
}
.case {
  margin: 0;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  overflow: hidden;
  cursor: zoom-in;
  transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease;
  display: flex;
  flex-direction: column;
}
.case.is-hidden { display: none; }
.case:hover {
  transform: translateY(-6px);
  border-color: var(--c-deep);
  box-shadow: var(--shadow-card-hv);
}
.case img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .6s ease;
}
.case:hover img { transform: scale(1.04); }
.case figcaption {
  padding: 20px 22px 22px;
  border-top: 1px solid var(--c-line);
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: linear-gradient(180deg, #fff, var(--c-bg-tint));
}
.case__tag {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-deep);
  letter-spacing: 0.05em;
  position: relative;
  padding-left: 12px;
}
.case__tag::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 3px;
  height: 14px;
  background: var(--c-blue);
  border-radius: 2px;
  transform: translateY(-50%);
}
.case__sub {
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.5;
  padding-left: 12px;
}

.cases__more-wrap {
  text-align: center;
  margin: 48px 0 0;
  position: relative;
  z-index: 1;
}
.cases__more {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 36px;
  background: #fff;
  border: 1.5px solid var(--c-deep);
  color: var(--c-deep);
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background .25s ease, color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.cases__more::after {
  content: "↓";
  font-size: 14px;
  font-weight: 700;
  transition: transform .3s ease;
}
.cases__more.is-expanded::after {
  transform: rotate(180deg);
}
.cases__more:hover {
  background: var(--c-deep);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(11, 46, 89, 0.20);
}
.cases__more[hidden] { display: none; }

.cases__note {
  text-align: center;
  margin: 56px 0 0;
  font-size: 14px;
  color: var(--c-muted);
  letter-spacing: 0.05em;
  line-height: 1.9;
  position: relative;
  z-index: 1;
}

/* ============ Promise — 浅蓝带，白色独立卡片 ============ */
.promise {
  padding: 140px 0 120px;
  background: var(--c-bg-tint-2);
  position: relative;
}
.promise::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line) 20%, var(--c-line) 80%, transparent);
}
.promise::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line) 20%, var(--c-line) 80%, transparent);
}
.promise__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.pledge {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  padding: 48px 40px 44px;
  position: relative;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  box-shadow: var(--shadow-card);
}
.pledge::before {
  content: "";
  position: absolute;
  top: 0; left: 32px; right: 32px;
  height: 2px;
  background: var(--c-blue);
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform .35s ease, background .3s ease;
}
.pledge:hover {
  transform: translateY(-4px);
  border-color: var(--c-blue);
  box-shadow: var(--shadow-card-hv);
}
.pledge:hover::before {
  transform: scaleX(1);
  background: var(--c-deep);
}
.pledge__hd {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-blue);
  letter-spacing: 0.25em;
  margin-bottom: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.pledge__hd::after {
  content: "";
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--c-line-dark);
}
.pledge h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--c-ink);
  margin: 8px 0 16px;
  letter-spacing: 0.02em;
}
.pledge p {
  margin: 0;
  font-size: 15px;
  color: var(--c-text);
  line-height: 1.85;
}
.promise__foot {
  text-align: center;
  margin: 56px 0 0;
  font-size: 17px;
  color: var(--c-ink);
  font-weight: 600;
  letter-spacing: 0.08em;
}

/* ============ Partners — 白底 + 蓝色分隔强调 ============ */
.partners {
  padding: 140px 0 120px;
  background: var(--c-bg-tint);
  position: relative;
}
.partners::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line) 20%, var(--c-line) 80%, transparent);
}
.partners__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 2px solid var(--c-deep);
  position: relative;
  background: #fff;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.partners__grid::before {
  /* 顶线下的轻装饰 */
  content: "";
  position: absolute;
  top: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 64px;
  height: 2px;
  background: var(--c-blue);
}
.partner-col {
  padding: 48px 40px 56px;
  border-right: 1px solid var(--c-line);
  position: relative;
  transition: background .3s ease;
}
.partner-col:last-child { border-right: 0; }
.partner-col:hover { background: var(--c-bg-tint); }
.partner-col__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-deep);
  margin-bottom: 30px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--c-line);
  letter-spacing: 0.08em;
  position: relative;
}
.partner-col__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 48px;
  height: 2px;
  background: var(--c-blue);
}
.partner-col__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 20px;
  font-size: 15px;
  color: var(--c-text);
  line-height: 2.1;
}
.partner-col__list li {
  position: relative;
  padding-left: 16px;
  letter-spacing: 0.02em;
}
.partner-col__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 6px;
  height: 6px;
  border: 1px solid var(--c-blue);
  border-radius: 1px;
  transform: translateY(-50%) rotate(45deg);
}
.partners__note {
  text-align: center;
  margin: 56px 0 0;
  font-size: 14px;
  color: var(--c-muted);
  letter-spacing: 0.05em;
  padding: 18px 0;
  border-top: 1px solid var(--c-line-soft);
}

/* ============ Contact — 深蓝层次区 ============ */
.contact {
  padding: 140px 0 130px;
  background: var(--c-deep);
  position: relative;
  overflow: hidden;
}
.contact::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 55% 50% at 18% 22%, rgba(47, 109, 181, 0.42) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 82% 80%, rgba(18, 63, 120, 0.5) 0%, transparent 60%);
  pointer-events: none;
}
.contact::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 75% 70% at 50% 50%, #000 0%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse 75% 70% at 50% 50%, #000 0%, transparent 85%);
  pointer-events: none;
}
.contact > .container { position: relative; z-index: 1; }

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 56px;
  align-items: start;
}
.contact__info {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: var(--r-lg);
  padding: 12px 32px;
  backdrop-filter: blur(4px);
}
.contact__list { margin: 0; }
.contact__item {
  padding: 28px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.10);
  position: relative;
}
.contact__item:last-child { border-bottom: 0; }
.contact__item dt {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-blue-soft);
  letter-spacing: 0.4em;
  margin-bottom: 10px;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.contact__item dt::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--c-blue);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(47, 109, 181, 0.25);
}
.contact__item dd { margin: 0; }
.contact__big {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.04em;
  display: inline-block;
  margin-bottom: 6px;
}
.contact__hint {
  font-size: 14px !important;
  color: rgba(255, 255, 255, 0.55) !important;
  letter-spacing: 0.03em;
  margin-top: 4px !important;
}

.contact__qr-card {
  background: #fff;
  padding: 32px 32px 28px;
  border-radius: var(--r-lg);
  text-align: center;
  box-shadow: var(--shadow-dark);
  position: relative;
}
.contact__qr-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-deep));
  border-radius: var(--r-lg) var(--r-lg) 0 0;
}
.contact__qr-card img {
  width: 100%;
  max-width: 280px;
  margin: 0 auto 20px;
  display: block;
  padding: 12px;
  background: var(--c-bg-tint);
  border-radius: var(--r-md);
}
.contact__qr-cap {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
  margin: 0 0 8px;
  letter-spacing: 0.08em;
}
.contact__qr-sub {
  font-size: 13px;
  color: var(--c-muted);
  margin: 0;
  letter-spacing: 0.02em;
}

/* ============ Footer ============ */
.footer {
  background: var(--c-deeper);
  color: rgba(255, 255, 255, 0.72);
  padding: 72px 0 0;
  font-size: 14px;
  position: relative;
}
.footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-blue), transparent);
  opacity: 0.5;
}
.footer__inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 56px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer__mark {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.footer__mark::before {
  content: "";
  width: 4px;
  height: 18px;
  background: var(--c-blue);
  border-radius: 2px;
}
.footer__slogan {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.55);
  max-width: 320px;
}
.footer__col h4 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 22px;
  letter-spacing: 0.1em;
  position: relative;
  padding-bottom: 12px;
}
.footer__col h4::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--c-blue);
}
.footer__col ul li {
  line-height: 2.1;
  color: rgba(255, 255, 255, 0.6);
  font-size: 13px;
}
.footer__bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px var(--gutter);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.4);
}

/* ============ Before / After 对比区（浅蓝带） ============ */
.comparison {
  padding: 140px 0 120px;
  background: var(--c-bg-tint);
  position: relative;
}
.comparison::before,
.comparison::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line) 20%, var(--c-line) 80%, transparent);
}
.comparison::before { top: 0; }
.comparison::after { bottom: 0; }
.ba__list {
  display: flex;
  flex-direction: column;
  gap: 64px;
}
.ba {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  padding: 36px 36px 40px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.ba::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-deep));
}
.ba__meta {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 28px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--c-line);
  flex-wrap: wrap;
}
.ba__tag {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-deep);
  letter-spacing: 0.05em;
  padding: 6px 14px;
  background: var(--c-bg-tint);
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
}
.ba__case {
  font-size: 14px;
  color: var(--c-muted);
  letter-spacing: 0.02em;
}
.ba__row {
  display: grid;
  grid-template-columns: 1fr 48px 1fr;
  align-items: center;
  gap: 20px;
}
.ba__col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.ba__label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.ba__col--before .ba__label { color: var(--c-muted); }
.ba__col--before .ba__label::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--c-muted);
  border-radius: 50%;
  opacity: 0.6;
}
.ba__col--after .ba__label { color: var(--c-deep); }
.ba__col--after .ba__label::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--c-blue);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(47, 109, 181, 0.18);
}
.ba__placeholder {
  aspect-ratio: 16 / 9;
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,0.04) 0 16px, transparent 16px 32px),
    linear-gradient(135deg, var(--c-deep) 0%, var(--c-deep-2) 100%);
  border-radius: var(--r-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  overflow: hidden;
}
.ba__placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
.ba__placeholder-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}
.ba__placeholder-bullets {
  font-size: 13px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.02em;
  position: relative;
  z-index: 1;
  list-style: none;
  padding: 0;
  margin: 0;
}
.ba__placeholder-bullets li::before {
  content: "× ";
  color: rgba(255, 255, 255, 0.5);
}
.ba__col img {
  width: 100%;
  border-radius: var(--r-md);
  border: 1px solid var(--c-line);
  display: block;
  background: #fff;
}
.ba__col--before img {
  /* 草稿原稿略微泛灰，强调与成品的对比 */
  filter: saturate(0.85) contrast(0.97);
}
.ba__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-blue);
  position: relative;
}
.ba__arrow svg {
  width: 36px;
  height: 36px;
  display: block;
}

/* ============ 服务流程（白底） ============ */
.process {
  padding: 140px 0 120px;
  background: var(--c-bg);
  position: relative;
}
.steps {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
  counter-reset: step;
}
.steps::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 5%;
  right: 5%;
  height: 2px;
  background: linear-gradient(90deg,
    var(--c-line-soft) 0%,
    var(--c-line) 8%,
    var(--c-line) 92%,
    var(--c-line-soft) 100%);
  z-index: 0;
}
.step {
  background: #fff;
  padding: 0 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 1;
}
.step__num {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--c-line);
  color: var(--c-deep);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 22px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  transition: all .3s ease;
  position: relative;
}
.step__num::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: transparent;
  border: 1px dashed transparent;
  transition: all .3s ease;
}
.step:hover .step__num {
  background: var(--c-deep);
  border-color: var(--c-deep);
  color: #fff;
  box-shadow: 0 8px 22px rgba(11, 46, 89, 0.20);
}
.step:hover .step__num::after {
  border-color: var(--c-blue-soft);
}
.step__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 10px;
  letter-spacing: 0.05em;
}
.step__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-muted);
  letter-spacing: 0.02em;
}
.process__foot {
  text-align: center;
  margin: 64px 0 0;
  font-size: 15px;
  color: var(--c-text);
  letter-spacing: 0.05em;
}
.process__foot strong {
  color: var(--c-deep);
  font-weight: 700;
}

/* ============ FAQ（白底） ============ */
.faq {
  padding: 140px 0 120px;
  background: var(--c-bg);
  position: relative;
}
.faq__list {
  max-width: 880px;
  margin: 0 auto;
  list-style: none;
  padding: 0;
}
.faq__item {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.faq__item.is-open {
  border-color: var(--c-blue);
  box-shadow: var(--shadow-soft);
}
.faq__q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 28px;
  font-size: 17px;
  font-weight: 600;
  color: var(--c-ink);
  letter-spacing: 0.02em;
  text-align: left;
  cursor: pointer;
  transition: background .25s ease, color .25s ease;
}
.faq__q:hover { background: var(--c-bg-tint); }
.faq__item.is-open .faq__q { color: var(--c-deep); }
.faq__toggle {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-line);
  border-radius: 50%;
  color: var(--c-blue);
  font-size: 18px;
  font-weight: 600;
  transition: transform .3s ease, background .25s ease, border-color .25s ease;
}
.faq__item.is-open .faq__toggle {
  background: var(--c-deep);
  border-color: var(--c-deep);
  color: #fff;
  transform: rotate(45deg);
}
.faq__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}
.faq__item.is-open .faq__a { max-height: 480px; }
.faq__a p {
  padding: 0 28px 26px;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-text);
}
.faq__a p + p { padding-top: 8px; }
.faq__a strong { color: var(--c-deep); font-weight: 600; }

/* ============ 悬浮咨询按钮 + 二维码弹窗 ============ */
.float-cta {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px 14px 18px;
  background: var(--c-deep);
  color: #fff;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  box-shadow: 0 12px 32px rgba(11, 46, 89, 0.30);
  cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
  border: 0;
}
.float-cta:hover {
  background: var(--c-deep-2);
  transform: translateY(-2px);
  box-shadow: 0 16px 38px rgba(11, 46, 89, 0.38);
}
.float-cta__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-blue-soft);
  box-shadow: 0 0 0 4px rgba(94, 141, 201, 0.30);
  animation: ctaPulse 2.2s ease-in-out infinite;
}
@keyframes ctaPulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(94, 141, 201, 0.30); }
  50% { box-shadow: 0 0 0 8px rgba(94, 141, 201, 0.10); }
}
.float-cta__id {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding-left: 10px;
  margin-left: 2px;
  border-left: 1px solid rgba(255, 255, 255, 0.25);
}

.qr-modal {
  position: fixed;
  inset: 0;
  background: rgba(6, 24, 48, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 250;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.qr-modal.is-open { display: flex; }
.qr-modal__card {
  background: #fff;
  border-radius: var(--r-lg);
  padding: 36px 36px 32px;
  max-width: 380px;
  width: 100%;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-dark);
}
.qr-modal__card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-deep));
  border-radius: var(--r-lg) var(--r-lg) 0 0;
}
.qr-modal__close {
  position: absolute;
  top: 14px; right: 14px;
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--c-muted);
  background: var(--c-bg-tint);
  transition: background .2s ease;
}
.qr-modal__close:hover { background: var(--c-line); color: var(--c-ink); }
.qr-modal__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-ink);
  margin: 4px 0 6px;
}
.qr-modal__sub {
  font-size: 13px;
  color: var(--c-muted);
  margin: 0 0 22px;
  letter-spacing: 0.04em;
}
.qr-modal__img {
  width: 100%;
  max-width: 240px;
  margin: 0 auto 18px;
  display: block;
  padding: 10px;
  background: var(--c-bg-tint);
  border-radius: var(--r-md);
}
.qr-modal__id {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--c-deep);
  letter-spacing: 0.06em;
  margin: 0 0 4px;
}
.qr-modal__hint {
  font-size: 12px;
  color: var(--c-muted);
  margin: 0;
  letter-spacing: 0.06em;
}

/* ============ Lightbox ============ */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(6, 24, 48, 0.96);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 64px;
}
.lightbox.is-open { display: flex; }
.lightbox__figure {
  margin: 0;
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.lightbox__figure img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  border-radius: var(--r-md);
  background: #fff;
}
.lightbox__figure figcaption {
  margin-top: 20px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  letter-spacing: 0.05em;
  text-align: center;
}
.lightbox__close,
.lightbox__prev,
.lightbox__next {
  position: absolute;
  width: 52px;
  height: 52px;
  color: #fff;
  font-size: 32px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s ease, transform .2s ease;
}
.lightbox__close { top: 32px; right: 32px; font-size: 28px; }
.lightbox__prev { left: 32px; top: 50%; transform: translateY(-50%); }
.lightbox__next { right: 32px; top: 50%; transform: translateY(-50%); }
.lightbox__close:hover { background: rgba(255, 255, 255, 0.18); }
.lightbox__prev:hover { background: rgba(255, 255, 255, 0.18); transform: translateY(-50%) translateX(-2px); }
.lightbox__next:hover { background: rgba(255, 255, 255, 0.18); transform: translateY(-50%) translateX(2px); }

/* =================================================================
   Responsive
   ================================================================= */
@media (max-width: 1080px) {
  .services__grid { grid-template-columns: repeat(2, 1fr); }
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .cases__grid { grid-template-columns: repeat(2, 1fr); }
  .promise__grid { grid-template-columns: repeat(2, 1fr); }

  .partners__grid { grid-template-columns: 1fr; }
  .partner-col { border-right: 0; border-bottom: 1px solid var(--c-line); }
  .partner-col:last-child { border-bottom: 0; }
  .partner-col__list { grid-template-columns: repeat(3, 1fr); }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 40px;
    max-width: 520px;
    margin: 0 auto;
  }
  .contact__qr-card { max-width: 380px; margin: 0 auto; }

  .footer__inner { grid-template-columns: 1fr 1fr; gap: 40px; }
  .footer__brand { grid-column: 1 / -1; }

  /* —— Before/After 中宽断点 —— */
  .ba__row { grid-template-columns: 1fr; gap: 18px; }
  .ba__arrow { transform: rotate(90deg); margin: 0 auto; }
  .ba__arrow svg { width: 28px; height: 28px; }

  /* —— 服务流程 中宽断点 —— */
  .steps { grid-template-columns: repeat(3, 1fr); row-gap: 48px; }
  .steps::before {
    display: none;
  }
}

@media (max-width: 720px) {
  :root { --gutter: 18px; }

  .nav__menu, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .nav__brand-text { font-size: 14px; letter-spacing: 0; }
  .nav__brand-mark { padding: 5px 9px; font-size: 13px; }
  .nav__inner { gap: 12px; height: 64px; }
  .nav.is-menu-open .nav__menu { top: 64px; }

  /* 移动端 nav 缩到 64px，对应调整 scroll-margin */
  section[id], footer.footer { scroll-margin-top: 72px; }
  .nav.is-menu-open .nav__menu {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0; right: 0;
    flex-direction: column;
    background: #fff;
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--c-line);
    gap: 4px;
    box-shadow: 0 8px 24px rgba(11, 46, 89, 0.10);
  }
  .nav.is-menu-open .nav__menu a {
    padding: 14px 0;
    border-bottom: 1px solid var(--c-line-soft);
  }
  .nav.is-menu-open .nav__menu a:last-child { border-bottom: 0; }

  .hero { min-height: 86vh; padding: 100px 0 80px; }
  .hero__title { font-size: clamp(40px, 11.5vw, 64px); }
  .hero__eyebrow { font-size: 12px; letter-spacing: 0.3em; padding: 0 16px; }
  .hero__eyebrow::before, .hero__eyebrow::after { width: 28px; }
  .hero__eyebrow::before { left: -28px; }
  .hero__eyebrow::after { right: -28px; }
  .hero__sub {
    font-size: 12px;
    padding: 8px 16px;
    letter-spacing: 0;
    gap: 8px;
    max-width: 94%;
    white-space: nowrap;
    line-height: 1.4;
  }
  .hero__sub::before {
    width: 5px;
    height: 5px;
    box-shadow: 0 0 0 3px rgba(47, 109, 181, 0.15);
  }
  .hero__bg::after { width: 220px; height: 220px; }

  .services, .stats, .cases, .comparison, .process, .promise, .faq, .partners, .contact { padding: 80px 0 64px; }
  .section-head { margin-bottom: 48px; }

  .services__grid { grid-template-columns: 1fr; gap: 16px; }
  .stats__grid { grid-template-columns: 1fr; gap: 14px; }
  .cases__grid { grid-template-columns: 1fr; gap: 20px; }
  .cases__filter { gap: 6px; }
  .filter-btn { padding: 8px 16px; font-size: 13px; }
  .promise__grid { grid-template-columns: 1fr; gap: 14px; }

  .stat { padding: 40px 24px 32px; }
  .stat__num { font-size: 56px; }

  .pledge { padding: 36px 28px 32px; }
  .pledge h3 { font-size: 20px; }

  .partner-col { padding: 36px 24px 40px; }
  .partner-col__list { grid-template-columns: 1fr 1fr; }

  .contact { padding: 80px 0 90px; }
  .contact__grid { gap: 32px; }
  .contact__info { padding: 8px 22px; }
  .contact__item { padding: 22px 0; }
  .contact__big { font-size: 26px; }
  .contact__qr-card { padding: 24px 24px 22px; }

  .footer { padding: 56px 0 0; }
  .footer__inner { grid-template-columns: 1fr; gap: 32px; padding-bottom: 36px; }
  .footer__brand { grid-column: 1; }
  .footer__slogan { max-width: none; }
  .footer__bar { flex-direction: column; gap: 8px; padding: 20px var(--gutter); text-align: center; }

  .lightbox { padding: 24px; }
  .lightbox__close { top: 16px; right: 16px; }
  .lightbox__prev { left: 8px; width: 44px; height: 44px; font-size: 24px; }
  .lightbox__next { right: 8px; width: 44px; height: 44px; font-size: 24px; }

  /* —— Before/After 移动端 —— */
  .ba { padding: 24px 22px 28px; }
  .ba__meta { gap: 10px; margin-bottom: 20px; padding-bottom: 14px; }
  .ba__row { gap: 14px; }
  .ba__placeholder { padding: 18px; }
  .ba__placeholder-title { font-size: 16px; }

  /* —— 服务流程 移动端 —— */
  .steps { grid-template-columns: 1fr; gap: 28px; }
  .step {
    display: grid;
    grid-template-columns: 56px 1fr;
    grid-template-rows: auto auto;
    column-gap: 18px;
    row-gap: 6px;
    text-align: left;
    align-items: start;
    padding: 0;
  }
  .step__num {
    grid-column: 1;
    grid-row: 1 / span 2;
    width: 56px;
    height: 56px;
    font-size: 18px;
    margin: 0;
    align-self: start;
  }
  .step__title {
    grid-column: 2;
    grid-row: 1;
    font-size: 17px;
    margin: 6px 0 0;
    align-self: center;
  }
  .step__desc {
    grid-column: 2;
    grid-row: 2;
    font-size: 13px;
    line-height: 1.65;
  }

  /* —— FAQ 移动端 —— */
  .faq__q { padding: 18px 20px; font-size: 15px; gap: 14px; }
  .faq__toggle { width: 28px; height: 28px; font-size: 16px; }
  .faq__a p { padding: 0 20px 20px; font-size: 14px; }

  /* —— 悬浮 CTA 移动端：更紧凑，给底部内容让位 —— */
  .float-cta {
    right: 12px;
    bottom: 12px;
    padding: 9px 14px 9px 11px;
    font-size: 12px;
    gap: 6px;
    letter-spacing: 0.02em;
  }
  .float-cta__id { font-size: 12px; padding-left: 6px; }
  .float-cta__dot { width: 6px; height: 6px; }

  /* —— 给底部内容让位，悬浮按钮不再遮挡 footer 版权/contact 扫码提示 —— */
  .footer { padding-bottom: 80px; }
  .footer__bar { padding-bottom: 32px; }
  .contact { padding-bottom: 110px; }

  .qr-modal__card { padding: 28px 24px 24px; }
  .qr-modal__title { font-size: 18px; }
  .qr-modal__img { max-width: 200px; }
}