/* ============================================================
   QKIE — 智能科技品牌官网
   ============================================================ */

:root {
  --bg: #0c0a07;
  --bg-soft: #12100b;
  --bg-card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.09);
  --text: #ece7dd;
  --text-muted: #a89f90;
  --primary: #f69006;
  --primary-2: #fbbf24;
  --blue: #0884ca;
  --green: #049d59;
  --gradient: linear-gradient(120deg, #f69006 0%, #fbbf24 100%);
  --radius: 16px;
  --container: 1140px;
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 动态背景:细网格 + 缓慢扫过的光带 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  background-image:
    linear-gradient(
      180deg,
      transparent 0%,
      rgba(255, 255, 255, 0.018) 42%,
      rgba(246, 144, 6, 0.05) 50%,
      rgba(255, 255, 255, 0.018) 58%,
      transparent 100%
    ),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 300px, 46px 46px, 46px 46px;
  background-position: 0 -300px, 0 0, 0 0;
  background-repeat: no-repeat, repeat, repeat;
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.8), transparent 85%);
  mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.8), transparent 85%);
  animation: gridSweep 18s linear infinite;
}

/* 动态背景:极淡的暖色光晕 */
body::after {
  content: "";
  position: fixed;
  inset: -25%;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(45% 45% at 22% 28%, rgba(246, 144, 6, 0.11), transparent 68%),
    radial-gradient(50% 50% at 78% 72%, rgba(8, 132, 202, 0.08), transparent 70%);
  animation: aurora 34s ease-in-out infinite alternate;
}

/* 动态背景:单色粒子星链画布 */
#bgCanvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: block;
}

@keyframes aurora {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(2.5%, -3%, 0) scale(1.1);
  }
}

@keyframes gridSweep {
  from {
    background-position: 0 -300px, 0 0, 0 0;
  }
  to {
    background-position: 0 100vh, 0 46px, 0 46px;
  }
}

img,
svg {
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

section[id] {
  scroll-margin-top: 90px;
}

.container {
  width: min(var(--container), 100% - 48px);
  margin-inline: auto;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease,
    border-color 0.25s ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--gradient);
  color: #241503;
  box-shadow: 0 8px 24px rgba(246, 144, 6, 0.32);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(246, 144, 6, 0.45);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.09);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 30px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
  padding: 13px;
  font-size: 16px;
}

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(12, 10, 7, 0.84);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 1px;
}

.logo-img {
  height: 38px;
  width: auto;
  border-radius: 9px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}

.nav-links {
  display: flex;
  gap: 6px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 15px;
  color: var(--text-muted);
  transition: color 0.25s ease, background 0.25s ease;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 语言切换 */
.lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: border-color 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.lang-btn:hover {
  border-color: rgba(246, 144, 6, 0.55);
  background: rgba(246, 144, 6, 0.14);
  color: #fcd34d;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 9px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
}

.nav-toggle span {
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 140px 0 80px;
  overflow: hidden;
}

.hero-orbs {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.24;
  animation: orbFloat 26s ease-in-out infinite alternate;
}

.orb-1 {
  width: 520px;
  height: 520px;
  top: -160px;
  left: -120px;
  background: radial-gradient(circle, #f69006, transparent 70%);
}

.orb-2 {
  width: 460px;
  height: 460px;
  top: 20%;
  right: -140px;
  background: radial-gradient(circle, #0884ca, transparent 70%);
  animation-delay: -5s;
}

.orb-3 {
  width: 380px;
  height: 380px;
  bottom: -140px;
  left: 35%;
  background: radial-gradient(circle, #049d59, transparent 70%);
  opacity: 0.1;
  animation-delay: -9s;
}

@keyframes orbFloat {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(40px, 30px, 0) scale(1.08);
  }
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: clamp(28px, 4.3vw, 55px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: 1px;
  text-wrap: balance;
}

/* 拉丁字母视觉尺寸偏小、单词较长,单独调校 */
html[lang="en"] .hero h1 {
  font-size: clamp(22px, 3vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.2px;
}

.hero-sub {
  margin-top: 20px;
  max-width: 520px;
  font-size: 17px;
  line-height: 1.72;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px;
}

.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 36px;
}

.hero-trust li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
}

.hero-trust svg {
  width: 16px;
  height: 16px;
  color: var(--primary-2);
}

/* Hero 3D 键盘场景 */
.hero-visual {
  position: relative;
}

.scene3d {
  position: relative;
  perspective: 1200px;
}

.kb3d-float {
  animation: kbFloat 7s ease-in-out infinite alternate;
  transform-style: preserve-3d;
}

.kb3d-spin {
  animation: kbSpin 12s ease-in-out infinite alternate;
  transform-style: preserve-3d;
}

.kb3d-base {
  width: min(460px, 100%);
  margin-inline: auto;
  padding: 20px 20px 24px;
  border-radius: 20px;
  background: linear-gradient(165deg, #37301f, #17130d 72%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 50px 90px rgba(0, 0, 0, 0.65), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transform: rotateX(42deg) rotateY(-10deg) rotateZ(-3deg);
  transform-style: preserve-3d;
  transition: transform 0.18s ease-out;
}

/* 键盘背部 RGB 灯带 */
.kb3d-base::before {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  top: 9px;
  height: 3px;
  border-radius: 2px;
  transform: translateZ(12px);
  background: linear-gradient(90deg, #f69006, #fbbf24, #0884ca, #049d59, #f69006);
  background-size: 200% 100%;
  animation: stripFlow 6s linear infinite;
  box-shadow: 0 0 14px rgba(246, 144, 6, 0.7), 0 0 26px rgba(8, 132, 202, 0.45);
  opacity: 0.95;
}

@keyframes stripFlow {
  from {
    background-position: 0% 0;
  }
  to {
    background-position: 200% 0;
  }
}

.kb3d-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
  transform-style: preserve-3d;
}

.kb3d-row:last-child {
  margin-bottom: 0;
}

.keycap {
  position: relative;
  flex: 1;
  height: 30px;
  border-radius: 6px;
  background: linear-gradient(180deg, #423b2c, #292217);
  border: 1px solid rgba(255, 255, 255, 0.09);
  box-shadow: 0 3px 0 #0d0a06, 0 9px 14px rgba(0, 0, 0, 0.45);
  transform: translateZ(14px);
  transform-style: preserve-3d;
}

.keycap::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0) 55%);
  pointer-events: none;
}

.keycap::after {
  content: "";
  position: absolute;
  inset: 0 0 -7px 0;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.28), rgba(0, 0, 0, 0.62));
  transform: translateZ(-7px);
}

.keycap.press {
  animation: keyPress 3.2s ease-in-out infinite;
}

.keycap.press-slow {
  animation: keyPress 4.6s ease-in-out infinite;
}

@keyframes keyPress {
  0%,
  100% {
    transform: translateZ(14px);
  }
  50% {
    transform: translateZ(4px);
  }
}

.keycap.acc {
  background: linear-gradient(180deg, #f6a638, #e07d05);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 3px 0 #7a4403, 0 9px 14px rgba(0, 0, 0, 0.45), 0 0 20px rgba(246, 144, 6, 0.6);
}

.keycap.blue {
  background: linear-gradient(180deg, #23a3dd, #0873b0);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 3px 0 #064866, 0 9px 14px rgba(0, 0, 0, 0.45), 0 0 20px rgba(8, 132, 202, 0.55);
}

.keycap.green {
  background: linear-gradient(180deg, #2db36f, #03824a);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 3px 0 #043d23, 0 9px 14px rgba(0, 0, 0, 0.45), 0 0 20px rgba(4, 157, 89, 0.55);
}

.keycap.wide {
  flex: 1.6;
}

.keycap.space {
  flex: 5;
}

.kb3d-glow {
  position: absolute;
  left: 50%;
  bottom: -30px;
  width: 82%;
  height: 130px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse, rgba(246, 144, 6, 0.38), transparent 70%);
  filter: blur(32px);
  z-index: -1;
  pointer-events: none;
  animation: glowPulse 5s ease-in-out infinite alternate;
}

@keyframes glowPulse {
  from {
    opacity: 0.6;
    transform: translateX(-50%) scale(1);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) scale(1.1);
  }
}

@keyframes kbFloat {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-14px);
  }
}

@keyframes kbSpin {
  from {
    transform: rotateY(-16deg);
  }
  to {
    transform: rotateY(12deg);
  }
}

.float-chip {
  position: absolute;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: rgba(12, 18, 32, 0.85);
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  animation: chipFloat 6s ease-in-out infinite alternate;
}

.chip-a {
  top: -22px;
  left: -26px;
}

.chip-b {
  bottom: 30px;
  right: -30px;
  animation-delay: -3s;
}

@keyframes chipFloat {
  from {
    transform: translateY(0) rotateZ(-2deg);
  }
  to {
    transform: translateY(-12px) rotateZ(2deg);
  }
}

/* ============================================================
   通用 section
   ============================================================ */
.section {
  padding: 110px 0;
  position: relative;
}

.section-head {
  max-width: 620px;
  margin-bottom: 56px;
}

.section-head.center {
  margin-inline: auto;
  text-align: center;
}

.section-tag {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid rgba(246, 144, 6, 0.35);
  background: rgba(246, 144, 6, 0.12);
  color: #fcd34d;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 18px;
}

.section-head h2 {
  font-size: clamp(26px, 3.1vw, 36px);
  line-height: 1.34;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-wrap: balance;
}

html[lang="en"] .section-head h2 {
  font-size: clamp(23px, 2.8vw, 32px);
  line-height: 1.26;
  letter-spacing: -0.2px;
}

.section-desc {
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 16px;
}

/* 滚动显现动画 */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   关于我们
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
  align-items: center;
}

.about-text p {
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 16px;
}

.about-points {
  margin-top: 28px;
  display: grid;
  gap: 14px;
}

.about-points li {
  padding: 14px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  font-size: 15px;
}

.about-points strong {
  display: inline-block;
  min-width: 74px;
  color: var(--text);
  margin-right: 6px;
}

.about-points strong::after {
  content: " ·";
  color: var(--primary-2);
}

.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.about-card {
  padding: 26px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.about-card:hover {
  transform: perspective(700px) rotateX(3deg) rotateY(2deg) translateY(-6px);
  border-color: rgba(246, 144, 6, 0.5);
  background: rgba(255, 255, 255, 0.06);
}

.about-card-icon {
  font-size: 30px;
  margin-bottom: 14px;
}

.about-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.about-card p {
  font-size: 14px;
  color: var(--text-muted);
}

/* ============================================================
   核心服务
   ============================================================ */
.services {
  background: rgba(18, 16, 11, 0.68);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.service-card {
  padding: 32px 26px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.service-card:hover {
  transform: perspective(800px) rotateX(3deg) rotateY(-3deg) translateY(-8px);
  border-color: rgba(246, 144, 6, 0.55);
  background: rgba(255, 255, 255, 0.06);
}

.service-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(246, 144, 6, 0.14);
  color: #fcd34d;
  margin-bottom: 20px;
  transition: background 0.3s ease, color 0.3s ease;
}

.service-card:hover .service-icon {
  background: var(--gradient);
  color: #241503;
}

.service-icon svg {
  width: 26px;
  height: 26px;
}

.service-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.service-card p {
  font-size: 14.5px;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.service-card a {
  font-size: 14px;
  font-weight: 600;
  color: #f6a638;
  transition: color 0.25s ease;
}

.service-card a:hover {
  color: var(--primary-2);
}

/* ============================================================
   数据带
   ============================================================ */
.stats-band {
  position: relative;
  padding: 76px 0;
  background: linear-gradient(120deg, rgba(246, 144, 6, 0.09), rgba(8, 132, 202, 0.07));
  border-block: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat strong {
  display: block;
  font-size: clamp(34px, 4vw, 46px);
  font-weight: 800;
  line-height: 1.2;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat > span {
  color: var(--text-muted);
  font-size: 15px;
}

/* ============================================================
   我们的优势
   ============================================================ */
.advantage-list {
  display: grid;
  gap: 0;
  max-width: 860px;
  margin-inline: auto;
}

.advantage-item {
  display: flex;
  gap: 30px;
  padding: 30px 8px;
  border-bottom: 1px solid var(--border);
  transition: padding 0.3s ease;
}

.advantage-item:first-child {
  border-top: 1px solid var(--border);
}

.advantage-item:hover {
  padding-left: 18px;
}

.advantage-num {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.2;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.85;
}

.advantage-body h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.advantage-body p {
  color: var(--text-muted);
  font-size: 15px;
  max-width: 620px;
}

/* ============================================================
   联系我们
   ============================================================ */
.contact {
  background: rgba(18, 16, 11, 0.68);
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  max-width: 860px;
  margin-inline: auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 9px;
  padding: 26px 26px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

a.contact-card:hover {
  transform: translateY(-5px);
  border-color: rgba(246, 144, 6, 0.5);
  background: rgba(255, 255, 255, 0.06);
}

.contact-card-ico {
  font-size: 24px;
  line-height: 1;
}

.contact-card-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.contact-card strong {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  word-break: break-word;
}

.contact-card-hint {
  font-size: 12px;
  font-weight: 600;
  color: #f6a638;
  white-space: nowrap;
  transition: color 0.25s ease;
}

a.contact-card:hover .contact-card-hint {
  color: #fcd34d;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(8, 6, 3, 0.86);
  padding-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-brand p {
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 14px;
}

.footer-company {
  margin-top: 6px !important;
  font-size: 13px !important;
  opacity: 0.75;
}

.footer-col h4 {
  font-size: 15px;
  margin-bottom: 18px;
  color: var(--text);
}

.footer-col a {
  display: block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.25s ease;
}

.footer-col a:hover {
  color: var(--primary-2);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 960px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 4px;
    padding: 18px 24px 26px;
    background: rgba(12, 10, 7, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
  }

  .nav-links.open {
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    display: block;
    padding: 12px 14px;
    font-size: 16px;
  }

  .nav-actions .btn {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 64px;
  }

  .hero-visual {
    max-width: 480px;
    margin-inline: auto;
    width: 100%;
  }

  .scene3d {
    transform: scale(0.82);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .hero {
    padding-top: 120px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-trust {
    gap: 14px;
  }

  .section {
    padding: 80px 0;
  }

  .services-grid,
  .about-cards,
  .contact-cards {
    grid-template-columns: 1fr;
  }

  .chip-a {
    left: 0;
  }

  .chip-b {
    right: 0;
  }

  .scene3d {
    transform: scale(0.62);
    margin: -30px 0 -10px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .advantage-item {
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #bgCanvas {
    display: none;
  }

  body::before,
  body::after,
  .kb3d-base::before,
  .kb3d-float,
  .kb3d-spin,
  .kb3d-glow,
  .orb,
  .float-chip,
  .keycap.press,
  .keycap.press-slow {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }
}