/* ============================================================
   德智物联 · 官网升级版样式
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

:root {
  --green:        #1f9d5a;
  --green-bright: #35b86e;
  --green-lite:   #6ad18d;
  --green-soft:   #e9f7ef;
  --green-tint:   #f3faf6;
  --amber:        #ffb020;
  --ink:          #0a1a23;
  --ink-soft:     #14323f;
  --ink-2:        #1d3b47;
  --muted:        #5c6f78;
  --line:         #e4ece8;
  --bg:           #ffffff;
  --bg-soft:      #f3f9f6;
  --white:        #ffffff;
  --radius:       20px;
  --radius-sm:    14px;
  --shadow-sm:    0 6px 18px -12px rgba(10,26,35,.45);
  --shadow:       0 24px 60px -28px rgba(10,26,35,.40);
  --shadow-lg:    0 40px 90px -40px rgba(10,26,35,.55);
  --maxw:         1180px;
  --ease:         cubic-bezier(.22,.68,.24,1);
  --font:         -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                  "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
                  "Noto Sans CJK SC", sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; font-weight: 800; letter-spacing: -.01em; }
p { margin: 0; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- 通用标题 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--green);
}
.eyebrow::before {
  content: "";
  width: 26px; height: 2px;
  background: linear-gradient(90deg, var(--green), var(--green-lite));
  border-radius: 2px;
}
.section-head { max-width: 680px; margin-bottom: 54px; }
.section-head.is-center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head.is-center .eyebrow { justify-content: center; }
.section-title {
  font-size: clamp(28px, 3.6vw, 44px);
  margin: 16px 0 18px;
  letter-spacing: -.02em;
}
.section-lead {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .01em;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .3s var(--ease),
              background .3s, color .3s, border-color .3s;
  white-space: nowrap;
  font-family: inherit;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--green-bright), var(--green));
  box-shadow: 0 16px 34px -16px rgba(31,157,90,.85);
}
.btn--primary:hover { box-shadow: 0 22px 44px -16px rgba(31,157,90,.95); }

.btn--ghost {
  color: #fff;
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.5);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover { background: rgba(255,255,255,.16); border-color: #fff; }

.btn--dark {
  color: #fff;
  background: var(--ink);
}
.btn--dark:hover { background: var(--ink-soft); }

.btn--light {
  color: var(--green);
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.btn--light:hover { box-shadow: var(--shadow); }

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 200;
  background: rgba(255,255,255,.86);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid transparent;
  transition: background .35s var(--ease), box-shadow .35s var(--ease),
              border-color .35s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(255,255,255,.97);
  box-shadow: 0 14px 40px -26px rgba(10,26,35,.5);
  border-bottom-color: var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 76px;
}
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand img { height: 38px; width: auto; }
.brand__text { display: none; }

.nav { margin-left: auto; }
.nav ul { display: flex; align-items: center; gap: 32px; }
.nav a {
  position: relative;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-2);
  padding: 6px 0;
  transition: color .25s;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--green), var(--green-bright));
  transition: width .3s var(--ease);
}
.nav a:hover, .nav a.is-active { color: var(--green); }
.nav a:hover::after, .nav a.is-active::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 14px; }
.phone-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
  transition: color .25s;
}
.phone-link:hover { color: var(--green); }
.phone-link svg { width: 18px; height: 18px; }
.header-actions .btn { padding: 11px 22px; font-size: 14px; }

/* 汉堡按钮 */
.hamburger {
  display: none;
  margin-left: auto;
  width: 46px; height: 46px;
  border: none;
  background: transparent;
  cursor: pointer;
  position: relative;
}
.hamburger span {
  position: absolute;
  left: 11px; right: 11px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform .3s var(--ease), opacity .3s, top .3s;
}
.hamburger span:nth-child(1) { top: 15px; }
.hamburger span:nth-child(2) { top: 22px; }
.hamburger span:nth-child(3) { top: 29px; }
.nav-open .hamburger span:nth-child(1) { top: 22px; transform: rotate(45deg); }
.nav-open .hamburger span:nth-child(2) { opacity: 0; }
.nav-open .hamburger span:nth-child(3) { top: 22px; transform: rotate(-45deg); }

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  inset: 76px 0 auto 0;
  z-index: 190;
  background: rgba(255,255,255,.98);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  padding: 18px 28px 30px;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 30px 60px -30px rgba(10,26,35,.4);
  transform: translateY(-14px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
}
.nav-open .mobile-menu { opacity: 1; transform: none; visibility: visible; }
.mobile-menu a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 4px;
  font-size: 17px;
  font-weight: 700;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu .mobile-cta { margin-top: 18px; }
.mobile-menu .mobile-cta .btn { width: 100%; }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100svh;
  padding: 150px 0 84px;
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background: #0a1a23 url("../assets/img/site-elec-cabinet.jpg") center/cover no-repeat;
  transform: scale(1.04);
  animation: heroZoom 18s ease-out forwards;
}
@keyframes heroZoom { from { transform: scale(1.12); } to { transform: scale(1.02); } }
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1200px 600px at 78% 20%, rgba(53,184,110,.28), transparent 60%),
    linear-gradient(115deg, rgba(7,20,28,.95) 0%, rgba(7,20,28,.72) 46%, rgba(7,20,28,.86) 100%);
}
.hero__inner { position: relative; z-index: 1; }
.hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--green-lite);
  margin-bottom: 26px;
}
.hero__kicker::before {
  content: "";
  width: 30px; height: 2px;
  background: var(--green-lite);
  border-radius: 2px;
}
.hero__title {
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.06;
  letter-spacing: -.03em;
  max-width: 900px;
  margin-bottom: 26px;
}
.hero__title em {
  font-style: normal;
  background: linear-gradient(120deg, var(--green-lite), var(--green-bright));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__sub {
  max-width: 620px;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.85;
  color: rgba(255,255,255,.82);
  margin-bottom: 40px;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 60px; }

/* 统计条 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 18px;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  max-width: 820px;
}
.stat {
  background: rgba(8,24,32,.34);
  padding: 22px 18px;
  text-align: center;
}
.stat__num {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1;
  color: #fff;
}
.stat__num .unit { color: var(--green-lite); font-size: .58em; margin-left: 2px; }
.stat__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(255,255,255,.7);
}

.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  color: rgba(255,255,255,.6);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.hero__scroll::after {
  content: "";
  width: 1px; height: 30px;
  background: linear-gradient(rgba(255,255,255,.7), transparent);
  animation: scrollLine 1.8s var(--ease) infinite;
}
@keyframes scrollLine { 0% { transform: scaleY(.3); opacity: 0; } 50% { opacity: 1; } 100% { transform: scaleY(1); opacity: 0; } }

/* ============================================================
   Section 通用
   ============================================================ */
.section { position: relative; padding: clamp(72px, 9vw, 120px) 0; }
.section--soft { background: var(--bg-soft); }
.section--tint { background: var(--green-tint); }
.section--dark { background: var(--ink); color: #fff; }
.section--dark .section-title { color: #fff; }
.section--dark .section-lead { color: rgba(255,255,255,.72); }

/* ---------- 业务卡片 ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}
.service-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 38px 34px 34px;
  box-shadow: var(--shadow-sm);
  transition: transform .45s var(--ease), box-shadow .45s var(--ease),
              border-color .45s var(--ease);
  overflow: hidden;
}
.service-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green-bright), var(--green));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .5s var(--ease);
}
.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
  border-color: rgba(31,157,90,.35);
}
.service-card:hover::before { transform: scaleX(1); }
.service-card__head { display: flex; align-items: center; gap: 16px; margin-bottom: 20px; }
.ico {
  flex-shrink: 0;
  width: 58px; height: 58px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, var(--green-soft), #fff);
  border: 1px solid rgba(31,157,90,.18);
  color: var(--green);
  box-shadow: 0 10px 24px -14px rgba(31,157,90,.7);
}
.ico svg { width: 28px; height: 28px; }
.service-card__idx {
  margin-left: auto;
  font-size: 34px;
  font-weight: 800;
  color: rgba(31,157,90,.13);
  letter-spacing: -.02em;
}
.service-card h3 { font-size: 22px; margin-bottom: 12px; }
.service-card p { color: var(--muted); font-size: 15.5px; margin-bottom: 20px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-2);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 13px;
}
.service-card--ai { background: linear-gradient(160deg, #0e2c24, var(--ink)); color: #fff; border-color: transparent; }
.service-card--ai h3 { color: #fff; }
.service-card--ai p { color: rgba(255,255,255,.74); }
.service-card--ai .tag { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.18); color: rgba(255,255,255,.85); }
.service-card--ai .ico { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.16); color: var(--green-lite); }
.service-card--ai .service-card__idx { color: rgba(255,255,255,.14); }
.badge-new {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
  color: #06251a;
  background: var(--green-lite);
  padding: 4px 10px;
  border-radius: 999px;
  margin-left: 10px;
  vertical-align: middle;
}

/* ---------- 案例 ---------- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}
.case-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink);
  box-shadow: var(--shadow-sm);
  min-height: 320px;
  display: flex;
  align-items: flex-end;
  transition: transform .45s var(--ease), box-shadow .45s var(--ease);
}
.case-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); }
.case-card__img {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform .8s var(--ease);
}
.case-card:hover .case-card__img { transform: scale(1.06); }
.case-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7,20,28,.92) 8%, rgba(7,20,28,.55) 46%, rgba(7,20,28,.12) 100%);
}
.case-card__body {
  position: relative;
  z-index: 1;
  padding: 30px;
  color: #fff;
  width: 100%;
}
.case-card__meta { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.pill {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.28);
  color: #fff;
  backdrop-filter: blur(4px);
}
.pill--green { background: var(--green); border-color: var(--green); }
.case-card h3 { font-size: 21px; margin-bottom: 10px; }
.case-card p { color: rgba(255,255,255,.78); font-size: 14.5px; }

/* ---------- 应用场景画廊 ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.gallery figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  box-shadow: var(--shadow-sm);
}
.gallery img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .7s var(--ease);
}
.gallery figure:hover img { transform: scale(1.07); }
.gallery figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 34px 20px 18px;
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  background: linear-gradient(to top, rgba(7,20,28,.88), transparent);
}
.gallery figcaption span { display: block; font-size: 12px; font-weight: 500; color: rgba(255,255,255,.7); margin-top: 3px; letter-spacing: .04em; }

/* ---------- 优势 ---------- */
.why-wrap { display: grid; grid-template-columns: .92fr 1.08fr; gap: 60px; align-items: center; }
.why-visual { position: relative; }
.why-visual__img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  aspect-ratio: 4 / 3.3;
}
.why-visual__img img { width: 100%; height: 100%; object-fit: cover; }
.why-badge {
  position: absolute;
  right: -18px;
  bottom: -18px;
  background: var(--white);
  border-radius: 18px;
  padding: 20px 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  text-align: center;
}
.why-badge strong { display: block; font-size: 30px; color: var(--green); line-height: 1; }
.why-badge span { font-size: 12.5px; color: var(--muted); letter-spacing: .04em; }

.why-list { display: grid; gap: 18px; margin-top: 30px; }
.why-item {
  display: flex;
  gap: 18px;
  padding: 22px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s;
}
.why-item:hover { transform: translateX(6px); box-shadow: var(--shadow-sm); border-color: rgba(31,157,90,.3); }
.why-item__num {
  flex-shrink: 0;
  font-size: 15px;
  font-weight: 800;
  color: var(--green);
  width: 42px; height: 42px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: var(--green-soft);
}
.why-item h3 { font-size: 18px; margin-bottom: 6px; }
.why-item p { font-size: 14.5px; color: var(--muted); }

/* ---------- 客户评价 ---------- */
.reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 30px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform .4s var(--ease), box-shadow .4s var(--ease);
}
.review-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.stars { color: var(--amber); font-size: 16px; letter-spacing: 3px; margin-bottom: 16px; }
.review-card blockquote {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
}
.review-card cite { font-style: normal; display: flex; align-items: center; gap: 13px; margin-top: auto; }
.avatar {
  width: 46px; height: 46px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(145deg, var(--green-bright), var(--green));
  font-size: 18px;
  flex-shrink: 0;
}
.review-card cite strong { display: block; font-size: 15px; }
.review-card cite span { font-size: 13px; color: var(--muted); }

/* ---------- 联系我们 ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: start; }
.contact-list { display: grid; gap: 14px; margin-top: 34px; }
.contact-item {
  display: flex;
  gap: 16px;
  padding: 20px 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  align-items: flex-start;
}
.contact-item .ico { width: 46px; height: 46px; border-radius: 12px; }
.contact-item .ico svg { width: 22px; height: 22px; }
.contact-item h4 { font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 700; margin-bottom: 4px; }
.contact-item p { font-size: 15.5px; font-weight: 600; color: var(--ink); line-height: 1.55; }
.contact-item a:hover { color: var(--green); }

.contact-card {
  background: linear-gradient(165deg, #0c2a22, var(--ink) 55%);
  color: #fff;
  border-radius: var(--radius);
  padding: 40px 36px;
  box-shadow: var(--shadow-lg);
}
.contact-card h3 { font-size: 22px; margin-bottom: 8px; }
.contact-card > p { color: rgba(255,255,255,.68); font-size: 14.5px; margin-bottom: 26px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: rgba(255,255,255,.75); margin-bottom: 7px; }
.field input, .field textarea, .field select {
  width: 100%;
  font-family: inherit;
  font-size: 15px;
  color: #fff;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 12px;
  padding: 13px 15px;
  transition: border-color .25s, background .25s;
}
.field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 14px;
  padding-right: 40px;
  cursor: pointer;
}
.field select option { background: #0c2a22; color: #fff; }
.field input::placeholder, .field textarea::placeholder { color: rgba(255,255,255,.4); }
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--green-bright);
  background: rgba(255,255,255,.11);
}
.field textarea { resize: vertical; min-height: 110px; }
.contact-card .btn { width: 100%; margin-top: 6px; }
.form-note { font-size: 12.5px; color: rgba(255,255,255,.5); margin-top: 14px; text-align: center; }
.form-success {
  display: none;
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: 12px;
  background: rgba(53,184,110,.16);
  border: 1px solid rgba(53,184,110,.5);
  color: var(--green-lite);
  font-size: 14px;
  font-weight: 600;
}
.form-success.is-on { display: block; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,.72);
  padding: 70px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-brand img { height: 34px; width: auto; }
.footer-brand span { font-size: 20px; font-weight: 800; color: #fff; letter-spacing: .02em; }
.footer-brand span small { display: block; font-size: 11px; letter-spacing: .18em; color: rgba(255,255,255,.5); font-weight: 600; }
.footer-about p { font-size: 14px; line-height: 1.8; color: rgba(255,255,255,.6); max-width: 320px; }
.footer-col h5 { color: #fff; font-size: 14px; letter-spacing: .08em; margin: 0 0 18px; font-weight: 700; }
.footer-col ul { display: grid; gap: 12px; }
.footer-col a, .footer-col li { font-size: 14px; color: rgba(255,255,255,.66); }
.footer-col a:hover { color: var(--green-lite); }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; line-height: 1.6; }
.footer-contact svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 3px; color: var(--green-lite); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 24px 0;
  font-size: 13px;
  color: rgba(255,255,255,.45);
}
.footer-bottom a { color: rgba(255,255,255,.6); }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 150;
  width: 50px; height: 50px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background: linear-gradient(145deg, var(--green-bright), var(--green));
  color: #fff;
  box-shadow: 0 16px 30px -12px rgba(31,157,90,.9);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
}
.back-top.is-on { opacity: 1; visibility: visible; transform: none; }
.back-top svg { width: 22px; height: 22px; }

/* ---------- 滚动揭示 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }

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

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .nav { display: none; }
  .header-actions { display: none; }
  .hamburger { display: block; }
  .why-wrap { grid-template-columns: 1fr; gap: 46px; }
  .contact-wrap { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .services-grid, .cases-grid, .reviews { grid-template-columns: 1fr 1fr; }
  .gallery { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .header-inner { height: 68px; }
  .mobile-menu { inset: 68px 0 auto 0; }
  .hero { padding: 128px 0 64px; min-height: auto; }
  .hero__title { font-size: clamp(32px, 9vw, 44px); }
  .hero__sub { font-size: 15.5px; }
  .hero__cta { gap: 12px; }
  .hero__cta .btn { flex: 1 1 46%; }
  .stats { grid-template-columns: 1fr 1fr; }
  .services-grid, .cases-grid, .reviews, .gallery { grid-template-columns: 1fr; }
  .case-card { min-height: 280px; }
  .service-card { padding: 30px 24px; }
  .service-card__idx { font-size: 28px; }
  .why-badge { right: 12px; bottom: 12px; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .form-row { grid-template-columns: 1fr; }
  .back-top { right: 16px; bottom: 16px; width: 46px; height: 46px; }
}

/* ============================================================
   新增板块：关于/标签/AI/流程/筛选/信任/FAQ/移动转化条
   ============================================================ */
.hero__tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px; }
.hero__tags span {
  font-size: 13px; color: rgba(255,255,255,.86);
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18);
  padding: 6px 14px; border-radius: 999px; backdrop-filter: blur(6px);
}

/* 关于我们 */
.about-wrap { display: grid; grid-template-columns: .95fr 1.05fr; gap: 60px; align-items: center; }
.about-media { position: relative; }
.about-media__img { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); aspect-ratio: 4 / 3.4; }
.about-media__img img { width: 100%; height: 100%; object-fit: cover; }
.about-badge {
  position: absolute; right: -16px; bottom: -16px;
  background: var(--white); border: 1px solid var(--line);
  border-radius: 16px; padding: 16px 20px; box-shadow: var(--shadow); text-align: center;
}
.about-badge strong { display: block; font-size: 26px; color: var(--green); line-height: 1; }
.about-badge span { font-size: 12px; color: var(--muted); }
.about-text { margin-top: 26px; display: grid; gap: 16px; }
.about-text p { color: var(--muted); font-size: 16px; line-height: 1.9; }
.about-stats { margin-top: 30px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.about-stats div { text-align: center; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 14px; padding: 16px 8px; }
.about-stats strong { display: block; font-size: 24px; color: var(--green); line-height: 1; }
.about-stats span { font-size: 12px; color: var(--muted); }

/* 业务卡片"了解详情" */
.card-link { display: inline-block; margin-top: 22px; font-weight: 700; font-size: 14px; color: var(--green); transition: color .2s; }
.card-link:hover { color: #177a46; }

/* AI 三步 */
.ai-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.ai-step { background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius); padding: 32px 28px; transition: transform .4s var(--ease), border-color .4s; }
.ai-step:hover { transform: translateY(-6px); border-color: rgba(106,209,141,.4); }
.ai-step__no { display: inline-block; font-size: 13px; font-weight: 800; letter-spacing: .1em; color: var(--green-lite); margin-bottom: 14px; }
.ai-step h3 { font-size: 20px; color: #fff; margin-bottom: 10px; }
.ai-step p { color: rgba(255,255,255,.72); font-size: 14.5px; line-height: 1.75; }

/* 服务流程 */
.process-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.process-step { padding: 30px 24px; text-align: center; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.process-step__no {
  display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(145deg, var(--green-bright), var(--green)); color: #fff; font-weight: 800; margin-bottom: 14px;
}
.process-step h3 { font-size: 17px; margin-bottom: 8px; }
.process-step p { font-size: 14px; color: var(--muted); }

/* 案例筛选 */
.case-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.filter-btn {
  font-family: inherit; font-size: 14px; font-weight: 600; padding: 9px 20px;
  border-radius: 999px; border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  cursor: pointer; transition: .25s;
}
.filter-btn:hover { border-color: rgba(31,157,90,.4); color: var(--green); }
.filter-btn.is-active { background: linear-gradient(135deg, var(--green-bright), var(--green)); color: #fff; border-color: transparent; }
.case-card.is-hidden { display: none; }
.case-card__result { margin-top: 12px; font-size: 13px; font-weight: 700; color: var(--green-lite); }

/* 信任与保障 */
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.trust-item { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 16px; padding: 26px 24px; }
.trust-item strong { display: block; font-size: 18px; color: var(--ink); margin-bottom: 8px; }
.trust-item span { font-size: 14px; color: var(--muted); line-height: 1.6; }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 0 22px; }
.faq-item summary { list-style: none; cursor: pointer; padding: 18px 34px 18px 0; font-weight: 700; font-size: 16px; color: var(--ink); position: relative; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; position: absolute; right: 0; top: 50%; transform: translateY(-50%); font-size: 22px; color: var(--green); font-weight: 400; }
.faq-item[open] summary::after { content: '–'; }
.faq-item p { padding: 0 0 18px; color: var(--muted); font-size: 15px; line-height: 1.8; }

/* 地图 / 微信 */
.map-link { display: inline-block; margin-top: 6px; font-size: 14px; font-weight: 700; color: var(--green); }
.map-link:hover { text-decoration: underline; }
.wechat-line { margin-top: 6px; font-size: 14px; color: var(--green); font-weight: 700; }

/* 移动端底部固定转化条 */
.fixbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 180; display: none;
  grid-template-columns: 1fr 1fr; gap: 1px;
  background: rgba(10,26,35,.96); backdrop-filter: blur(14px); border-top: 1px solid rgba(255,255,255,.08);
}
.fixbar a { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 10px; font-size: 15px; font-weight: 700; color: #fff; }
.fixbar .fb-call { background: linear-gradient(135deg, var(--green-bright), var(--green)); }
.fixbar .fb-msg { color: var(--green-lite); }

/* 新增板块响应式 */
@media (max-width: 1080px) {
  .about-wrap { grid-template-columns: 1fr; gap: 40px; }
  .ai-steps { grid-template-columns: 1fr 1fr; }
  .process-steps { grid-template-columns: 1fr 1fr; gap: 16px; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .fixbar { display: grid; }
  .site-footer { padding-bottom: 96px; }
  .back-top { bottom: 78px; }
  .about-stats { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .ai-steps, .process-steps, .trust-grid { grid-template-columns: 1fr; }
}

/* 资质证书展示 */
.cert-showcase {
  display: flex; flex-wrap: wrap; align-items: center; gap: 28px;
  margin-top: 28px; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm);
}
.cert-showcase img { width: 220px; max-width: 100%; border-radius: 10px; border: 1px solid var(--line); }
.cert-showcase__info strong { display: block; font-size: 18px; margin-bottom: 8px; color: var(--ink); }
.cert-showcase__info span { color: var(--muted); font-size: 14px; line-height: 1.7; }
@media (max-width: 640px) {
  .cert-showcase { flex-direction: column; align-items: flex-start; }
  .cert-showcase img { width: 100%; }
}