/* ============================================================
   铭赞网络 SEM 营销 - 主样式表
   ============================================================ */

:root {
  --c-bg: #ffffff;
  --c-bg-alt: #f5f7fb;
  --c-bg-dark: #0b1e3f;
  --c-bg-dark-2: #081631;
  --c-text: #1a2233;
  --c-text-2: #4a5568;
  --c-text-3: #7a869a;
  --c-line: #e5eaf2;
  --c-line-2: #d6dde8;
  --c-primary: #ff6a1a;
  --c-primary-2: #ff8a3d;
  --c-accent: #1c4ed8;
  --c-accent-2: #3b6cf0;
  --c-success: #10b981;

  --shadow-sm: 0 1px 2px rgba(11, 30, 63, .06), 0 1px 3px rgba(11, 30, 63, .04);
  --shadow-md: 0 6px 16px rgba(11, 30, 63, .08), 0 2px 4px rgba(11, 30, 63, .04);
  --shadow-lg: 0 20px 40px rgba(11, 30, 63, .12), 0 8px 16px rgba(11, 30, 63, .06);
  --shadow-xl: 0 30px 60px rgba(11, 30, 63, .16);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --container: 1200px;
  --header-h: 72px;

  --t-fast: .18s;
  --t: .28s;
  --t-slow: .5s;
  --ease: cubic-bezier(.4, 0, .2, 1);

  --f-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", "Segoe UI", "Source Han Sans CN", system-ui, -apple-system, sans-serif;
  --f-num: "SF Pro Display", "Inter", "Helvetica Neue", system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--f-sans);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: color var(--t-fast) var(--ease); }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: 0; background: transparent; }

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

/* ============== Buttons ============== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .2px;
  transition: all var(--t) var(--ease);
  cursor: pointer;
  white-space: nowrap;
  line-height: 1;
}
.btn-lg { padding: 14px 28px; font-size: 15px; }

.btn-primary {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-2) 100%);
  color: #fff;
  box-shadow: 0 6px 16px rgba(255, 106, 26, .28);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(255, 106, 26, .4);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, .35);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, .1);
  border-color: rgba(255, 255, 255, .6);
}

/* ============== Topbar ============== */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: all var(--t) var(--ease);
}
.topbar.scrolled {
  background: rgba(255, 255, 255, .95);
  border-bottom-color: var(--c-line);
  box-shadow: var(--shadow-sm);
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
  flex-wrap: nowrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 22px;
  letter-spacing: .5px;
  white-space: nowrap;
}
.brand-name {
  color: var(--c-bg-dark);
  position: relative;
}
.brand-r {
  color: var(--c-primary);
  font-size: 12px;
  margin-left: 1px;
  top: -10px;
  position: relative;
}
.brand-sep {
  color: var(--c-line-2);
  font-weight: 300;
  font-size: 22px;
}
.brand-tag {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 22px;
  font-weight: 800;
}
.brand-footer .brand-name,
.brand-footer .brand-tag { font-size: 20px; }

.nav {
  display: flex;
  gap: 4px;
  align-items: center;
  flex: 1;
  justify-content: center;
  flex-wrap: nowrap;
}
.nav-link {
  position: relative;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-2);
  border-radius: 8px;
  transition: all var(--t-fast) var(--ease);
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--c-primary);
  border-radius: 1px;
  transition: all var(--t) var(--ease);
  transform: translateX(-50%);
}
.nav-link:hover { color: var(--c-primary); }
.nav-link:hover::after,
.nav-link.active::after { width: 24px; }
.nav-link.active { color: var(--c-primary); }

.nav-cta { font-size: 14px; padding: 10px 18px; }

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
}
.menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: all var(--t) var(--ease);
}

/* ============== Hero ============== */
.hero {
  position: relative;
  min-height: 640px;
  padding: calc(var(--header-h) + 80px) 0 80px;
  overflow: hidden;
  isolation: isolate;
  color: #fff;
  background: linear-gradient(135deg, #0a1a3a 0%, #0b1e3f 50%, #0d2952 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 0%, transparent 75%);
}
.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .55;
  animation: float 12s ease-in-out infinite;
}
.hero-blob-a {
  width: 480px; height: 480px;
  top: -120px; right: -100px;
  background: radial-gradient(circle, rgba(255, 106, 26, .55), transparent 70%);
}
.hero-blob-b {
  width: 560px; height: 560px;
  bottom: -180px; left: -120px;
  background: radial-gradient(circle, rgba(59, 108, 240, .45), transparent 70%);
  animation-delay: -6s;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -20px); }
}
.hero-particles { position: absolute; inset: 0; pointer-events: none; }
.hero-particles i {
  position: absolute;
  width: 3px; height: 3px;
  background: rgba(255, 255, 255, .6);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(255, 255, 255, .8);
  animation: rise linear infinite;
}
@keyframes rise {
  0% { transform: translateY(0) scale(.5); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-100vh) scale(1.2); opacity: 0; }
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 60px;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 2px;
  color: rgba(255, 255, 255, .85);
  background: rgba(255, 255, 255, .06);
  backdrop-filter: blur(6px);
  margin-bottom: 20px;
  animation: fadeInDown .8s var(--ease);
}
.hero-title {
  font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1.18;
  font-weight: 800;
  margin: 0 0 18px;
  letter-spacing: -1px;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(135deg, #ffb37a 0%, #ff6a1a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  position: relative;
}
.hero-title-line { display: block; }
.hero-subtitle {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .78);
  margin: 0 0 32px;
  max-width: 520px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-points {
  list-style: none;
  padding: 0; margin: 0;
  display: flex; gap: 24px; flex-wrap: wrap;
  color: rgba(255, 255, 255, .85);
  font-size: 14px;
}
.hero-points li { display: flex; align-items: center; gap: 8px; }
.check {
  display: inline-flex; align-items: center; justify-content: center;
  width: 20px; height: 20px;
  background: rgba(16, 185, 129, .18);
  color: #34d399;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-title { animation: fadeInUp .8s var(--ease) both; animation-delay: .15s; }
.hero-subtitle { animation: fadeInUp .8s var(--ease) both; animation-delay: .3s; }
.hero-cta { animation: fadeInUp .8s var(--ease) both; animation-delay: .45s; }
.hero-points { animation: fadeInUp .8s var(--ease) both; animation-delay: .6s; }

/* Hero card mock */
.hero-card { animation: fadeInUp 1s var(--ease) both; animation-delay: .5s; }
.card-mock {
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .15);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  overflow: hidden;
  box-shadow: var(--shadow-xl), 0 0 60px rgba(59, 108, 240, .25);
}
.card-head {
  display: flex; align-items: center; gap: 8px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, .05);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #ffbd2e; }
.dot-g { background: #28c840; }
.card-title {
  margin-left: 8px;
  font-size: 12px;
  color: rgba(255, 255, 255, .6);
  letter-spacing: 1px;
}
.card-body { padding: 24px; }
.kpi-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 24px; }
.kpi {
  padding: 14px 12px;
  background: rgba(255, 255, 255, .05);
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid rgba(255, 255, 255, .08);
}
.kpi-num {
  font-family: var(--f-num);
  font-size: 22px;
  font-weight: 700;
  color: #ffb37a;
  letter-spacing: -.5px;
}
.kpi-lbl { font-size: 12px; color: rgba(255, 255, 255, .55); margin-top: 2px; }
.bar-chart {
  display: flex; align-items: flex-end; gap: 10px;
  height: 100px;
  padding: 8px 0;
}
.bar {
  flex: 1;
  height: var(--h);
  background: linear-gradient(180deg, var(--c-primary-2) 0%, var(--c-primary) 100%);
  border-radius: 4px 4px 0 0;
  animation: barGrow 1s var(--ease) both;
  transform-origin: bottom;
  position: relative;
}
.bar::after {
  content: ""; position: absolute; top: -4px; left: 0; right: 0;
  height: 4px; background: rgba(255, 255, 255, .3);
  border-radius: 2px;
}
.bar:nth-child(1) { animation-delay: .6s; }
.bar:nth-child(2) { animation-delay: .7s; }
.bar:nth-child(3) { animation-delay: .8s; }
.bar:nth-child(4) { animation-delay: .9s; }
.bar:nth-child(5) { animation-delay: 1.0s; }
.bar:nth-child(6) { animation-delay: 1.1s; }
.bar:nth-child(7) { animation-delay: 1.2s; }
@keyframes barGrow {
  from { transform: scaleY(0); }
  to { transform: scaleY(1); }
}
.card-foot {
  margin-top: 18px;
  display: flex; align-items: center; gap: 8px;
  font-size: 12px;
  color: rgba(255, 255, 255, .55);
}
.live {
  width: 8px; height: 8px;
  background: #34d399;
  border-radius: 50%;
  box-shadow: 0 0 8px #34d399;
  animation: pulse 1.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .4; transform: scale(.7); }
}

.scroll-cue {
  position: absolute;
  left: 50%; bottom: 24px;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid rgba(255, 255, 255, .35);
  border-radius: 16px;
  display: flex; justify-content: center; padding-top: 8px;
}
.scroll-cue span {
  display: block; width: 3px; height: 8px;
  background: #fff; border-radius: 2px;
  animation: scrollDot 1.6s ease-in-out infinite;
}
@keyframes scrollDot {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(14px); opacity: 0; }
}

/* ============== Stats ============== */
.stats {
  background: #fff;
  padding: 60px 0;
  border-bottom: 1px solid var(--c-line);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat {
  text-align: center;
  padding: 16px;
  position: relative;
}
.stat::after {
  content: ""; position: absolute; right: 0; top: 25%; height: 50%;
  width: 1px; background: var(--c-line);
}
.stat:last-child::after { display: none; }
.stat-num {
  font-family: var(--f-num);
  font-size: 48px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-bg-dark) 0%, var(--c-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  display: inline-block;
  letter-spacing: -1.5px;
}
.stat-num-unit {
  display: inline-block;
  font-size: 22px;
  font-weight: 700;
  color: var(--c-primary);
  margin-left: 2px;
  vertical-align: top;
  line-height: 1.1;
}
.stat-lbl {
  font-size: 14px;
  color: var(--c-text-2);
  margin-top: 8px;
}

/* ============== Section ============== */
.section { padding: 96px 0; }
.section-alt { background: var(--c-bg-alt); }
.section-dark {
  background: linear-gradient(135deg, var(--c-bg-dark) 0%, var(--c-bg-dark-2) 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.section-dark::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 106, 26, .12), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(59, 108, 240, .12), transparent 50%);
  pointer-events: none;
}
.section-dark > .container { position: relative; z-index: 1; }

.sec-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.sec-eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--c-primary);
  margin-bottom: 12px;
  padding: 4px 0;
  position: relative;
}
.sec-eyebrow::before, .sec-eyebrow::after {
  content: "";
  display: inline-block;
  width: 24px; height: 1px;
  background: var(--c-primary);
  vertical-align: middle;
  margin: 0 12px;
  opacity: .5;
}
.sec-head-light .sec-eyebrow { color: #ffb37a; }
.sec-head-light .sec-eyebrow::before, .sec-head-light .sec-eyebrow::after { background: #ffb37a; }

.sec-title {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 800;
  margin: 0 0 14px;
  letter-spacing: -.5px;
  line-height: 1.25;
}
.sec-head-light .sec-title { color: #fff; }
.sec-desc {
  font-size: 15px;
  color: var(--c-text-2);
  margin: 0;
  line-height: 1.7;
}
.sec-head-light .sec-desc { color: rgba(255, 255, 255, .7); }

/* ============== Service ============== */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.svc {
  padding: 32px 28px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  transition: all var(--t) var(--ease);
  position: relative;
  overflow: hidden;
}
.svc::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t) var(--ease);
}
.svc:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.svc:hover::before { transform: scaleX(1); }
.svc-ico {
  width: 56px; height: 56px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(255, 106, 26, .1), rgba(255, 106, 26, .04));
  color: var(--c-primary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  transition: all var(--t) var(--ease);
}
.svc:hover .svc-ico {
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-2));
  color: #fff;
  transform: scale(1.05);
}
.svc h3 { font-size: 18px; font-weight: 700; margin: 0 0 10px; color: var(--c-bg-dark); }
.svc p { font-size: 14px; color: var(--c-text-2); margin: 0; line-height: 1.7; }

/* ============== Advantage ============== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.adv {
  padding: 28px 22px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  text-align: center;
  transition: all var(--t) var(--ease);
  position: relative;
}
.adv:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary);
}
.adv-num {
  font-family: var(--f-num);
  font-size: 36px;
  font-weight: 800;
  color: var(--c-primary);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: -1px;
}
.adv h3 { font-size: 16px; font-weight: 700; margin: 0 0 10px; color: var(--c-bg-dark); }
.adv p { font-size: 13px; color: var(--c-text-2); margin: 0; line-height: 1.6; }

/* ============== Industry ============== */
.ind-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.ind {
  padding: 32px 24px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  text-align: center;
  transition: all var(--t) var(--ease);
}
.ind:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.ind-ico {
  font-size: 42px;
  margin-bottom: 12px;
  display: block;
}
.ind h3 { font-size: 18px; font-weight: 700; margin: 0 0 8px; color: var(--c-bg-dark); }
.ind p { font-size: 13px; color: var(--c-text-2); margin: 0; line-height: 1.7; }

/* ============== Process ============== */
.process {
  list-style: none;
  padding: 0; margin: 0;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  position: relative;
}
.proc {
  position: relative;
  text-align: center;
  padding: 24px 12px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--radius);
  transition: all var(--t) var(--ease);
}
.proc:hover {
  background: rgba(255, 255, 255, .08);
  transform: translateY(-4px);
  border-color: rgba(255, 106, 26, .5);
}
.proc-num {
  font-family: var(--f-num);
  font-size: 28px;
  font-weight: 800;
  color: var(--c-primary);
  line-height: 1;
  margin-bottom: 12px;
  letter-spacing: -1px;
}
.proc h3 { font-size: 15px; font-weight: 700; margin: 0 0 8px; color: #fff; }
.proc p { font-size: 12px; color: rgba(255, 255, 255, .65); margin: 0; line-height: 1.6; }

/* ============== About ============== */
.about-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.about-card {
  padding: 32px 24px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  transition: all var(--t) var(--ease);
  text-align: center;
}
.about-card:hover {
  border-color: var(--c-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.about-ico {
  font-size: 40px;
  display: block;
  margin-bottom: 14px;
}
.about-card h3 { font-size: 16px; font-weight: 700; margin: 0 0 8px; color: var(--c-bg-dark); }
.about-card p { font-size: 13px; color: var(--c-text-2); margin: 0; line-height: 1.7; }

/* ============== FAQ ============== */
.faq-wrap {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 56px;
  align-items: start;
}
.faq-side .sec-title { text-align: left; }
.faq-side .sec-eyebrow { padding-left: 0; }
.faq-side .sec-eyebrow::before { display: none; }
.faq-side .sec-eyebrow { text-align: left; }
.faq-side .sec-desc { margin-bottom: 24px; }

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--t) var(--ease);
}
.faq-item[open] { border-color: var(--c-primary); box-shadow: var(--shadow-sm); }
.faq-item summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-bg-dark);
  list-style: none;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.q-num {
  flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-2));
  color: #fff;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .5px;
}
.q-text { flex: 1; line-height: 1.5; }
.q-arr {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border: 1.5px solid var(--c-line-2);
  border-radius: 50%;
  position: relative;
  transition: all var(--t) var(--ease);
}
.q-arr::before, .q-arr::after {
  content: "";
  position: absolute;
  background: var(--c-text-3);
  border-radius: 1px;
  transition: all var(--t) var(--ease);
}
.q-arr::before { top: 50%; left: 8px; right: 8px; height: 1.5px; transform: translateY(-50%); }
.q-arr::after { top: 8px; bottom: 8px; left: 50%; width: 1.5px; transform: translateX(-50%); }
.faq-item[open] .q-arr { border-color: var(--c-primary); transform: rotate(45deg); }
.faq-item[open] .q-arr::before, .faq-item[open] .q-arr::after { background: var(--c-primary); }

.q-ans {
  padding: 0 22px 22px 72px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-2);
  animation: fadeInUp .35s var(--ease);
}

/* ============== Contact ============== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}
.ci {
  padding: 32px 24px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--t) var(--ease);
  backdrop-filter: blur(6px);
}
.ci:hover {
  background: rgba(255, 255, 255, .08);
  border-color: var(--c-primary);
  transform: translateY(-4px);
}
.ci-ico {
  width: 52px; height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-2));
  color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.ci h3 { font-size: 15px; font-weight: 600; margin: 0 0 10px; color: rgba(255, 255, 255, .85); }
.ci p { font-size: 20px; font-weight: 700; margin: 0 0 8px; color: #fff; }
.ci p a { color: #fff; }
.ci p a:hover { color: var(--c-primary-2); }
.ci-tag { font-size: 12px; color: rgba(255, 255, 255, .55); }
.ci-qr .qr-box {
  display: inline-flex; flex-direction: column; align-items: center; gap: 8px;
  margin-top: 8px;
  padding: 10px;
  background: #fff;
  border-radius: var(--radius);
}
.qr-box img { width: 120px; height: 120px; border-radius: 6px; }
.qr-box span { font-size: 12px; color: var(--c-text-2); }

.weibo-row { text-align: center; }
.weibo {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .15);
  border-radius: 999px;
  color: rgba(255, 255, 255, .85);
  font-size: 14px;
  transition: all var(--t) var(--ease);
}
.weibo:hover {
  background: rgba(255, 255, 255, .12);
  color: #fff;
}

/* ============== Link cloud ============== */
.link-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.link-cloud a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--c-text-2);
  transition: all var(--t) var(--ease);
}
.link-cloud a::after {
  content: "↗";
  font-size: 11px;
  color: var(--c-text-3);
  transition: all var(--t) var(--ease);
}
.link-cloud a:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.link-cloud a:hover::after { color: var(--c-primary); transform: translate(2px, -2px); }

/* ============== Footer ============== */
.footer {
  background: #050d1f;
  color: rgba(255, 255, 255, .65);
  padding: 64px 0 24px;
  border-top: 1px solid rgba(255, 255, 255, .06);
}
.footer-top {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.footer-brand .brand { margin-bottom: 14px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { font-size: 13px; color: rgba(255, 255, 255, .55); margin: 0; line-height: 1.8; }
.footer-cols {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}
.fc h4 { font-size: 13px; color: #fff; font-weight: 600; margin: 0 0 14px; letter-spacing: 1px; }
.fc a {
  display: block;
  font-size: 12.5px;
  color: rgba(255, 255, 255, .55);
  padding: 4px 0;
  transition: color var(--t-fast) var(--ease);
}
.fc a:hover { color: var(--c-primary-2); }
.footer-bot {
  padding-top: 24px;
  text-align: center;
  font-size: 12.5px;
  color: rgba(255, 255, 255, .45);
  line-height: 1.9;
}
.footer-bot p { margin: 4px 0; }
.footer-bot a { color: rgba(255, 255, 255, .6); transition: color var(--t-fast) var(--ease); }
.footer-bot a:hover { color: var(--c-primary-2); }
.addr { color: rgba(255, 255, 255, .35); font-size: 12px; }

/* ============== Floating tools ============== */
.float-tools {
  position: fixed;
  right: 20px;
  bottom: 30px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 99;
}
.ft {
  width: 56px; height: 56px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-size: 11px;
  color: var(--c-text-2);
  cursor: pointer;
  transition: all var(--t) var(--ease);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}
.ft:hover {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(255, 106, 26, .35);
}
.ft-top { opacity: 0; pointer-events: none; transform: translateY(20px); }
.float-tools.show .ft-top { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* ============== Reveal animations ============== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ============== Responsive ============== */
@media (max-width: 1080px) {
  .menu-btn { display: flex; }
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    background: #fff;
    padding: 16px 20px 20px;
    border-top: 1px solid var(--c-line);
    box-shadow: var(--shadow-md);
    transform: translateY(-110%);
    transition: transform var(--t) var(--ease);
    gap: 4px;
    align-items: stretch;
    justify-content: flex-start;
  }
  .nav.open { transform: translateY(0); }
  .nav-link { padding: 12px 14px; border-radius: var(--radius); }
  .nav-link::after { display: none; }
  .nav-link.active, .nav-link:hover { background: rgba(255, 106, 26, .08); }
  .nav-cta { display: none; }
}

@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-card { max-width: 460px; margin: 0 auto; }
  .adv-grid { grid-template-columns: repeat(3, 1fr); }
  .process { grid-template-columns: repeat(3, 1fr); }
  .about-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-cols { grid-template-columns: repeat(3, 1fr); }
  .faq-wrap { grid-template-columns: 1fr; gap: 32px; }
  .faq-side .sec-title { text-align: center; }
  .faq-side .sec-eyebrow { text-align: center; }
  .faq-side .sec-eyebrow::before { display: inline-block; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  :root { --header-h: 60px; }
  .menu-btn { display: flex; }
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    background: #fff;
    padding: 16px 20px 20px;
    border-top: 1px solid var(--c-line);
    box-shadow: var(--shadow-md);
    transform: translateY(-110%);
    transition: transform var(--t) var(--ease);
    gap: 4px;
    align-items: stretch;
  }
  .nav.open { transform: translateY(0); }
  .nav-link { padding: 12px 14px; border-radius: var(--radius); }
  .nav-link::after { display: none; }
  .nav-link.active, .nav-link:hover { background: rgba(255, 106, 26, .08); }
  .nav-cta { display: none; }
  .brand { font-size: 18px; }
  .brand-name, .brand-tag { font-size: 18px; }
  .brand-r { font-size: 10px; }
  .brand-sep { font-size: 18px; }

  .hero { padding-top: calc(var(--header-h) + 40px); min-height: 0; padding-bottom: 60px; }
  .hero-title { font-size: 32px; }
  .hero-subtitle { font-size: 14px; }
  .hero-points { font-size: 13px; gap: 14px; }
  .scroll-cue { display: none; }
  .card-mock { font-size: 14px; }
  .kpi-num { font-size: 18px; }

  .section { padding: 64px 0; }
  .stats { padding: 40px 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat::after { display: none; }
  .stat-num { font-size: 36px; }

  .service-grid, .ind-grid { grid-template-columns: 1fr; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); gap: 18px; }

  .q-ans { padding: 0 18px 18px 18px; }
  .faq-item summary { padding: 14px 18px; gap: 10px; }
  .q-num { width: 30px; height: 30px; font-size: 12px; }

  .float-tools { right: 12px; bottom: 18px; gap: 6px; }
  .ft { width: 48px; height: 48px; font-size: 10px; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { justify-content: center; }
  .stats-grid { grid-template-columns: 1fr; }
}