/* ==========================================================================
   临清市奥恒赛钢球制造有限公司 · 官网
   设计语言：极简 / 大字号 / 大留白 / 深色与雾白分区 / 金属球体视觉
   ========================================================================== */

/* --- 设计变量 ------------------------------------------------------------ */
:root {
  --ink: #0a0a0c;
  --ink-2: #141519;
  --paper: #ffffff;
  --mist: #f5f5f7;
  --gray-1: #6e6e73;
  --gray-2: #86868b;
  --gray-3: #a1a1a6;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.14);
  --line-dark: rgba(255, 255, 255, 0.16);
  --on-dark: rgba(255, 255, 255, 0.88);
  --on-dark-2: rgba(255, 255, 255, 0.58);
  --on-dark-3: rgba(255, 255, 255, 0.34);
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --blue-dark: #2997ff;
  --maxw: 1120px;
  --nav-h: 48px;
  --r-lg: 28px;
  --r-md: 18px;
  --r-sm: 12px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro SC", "SF Pro Display",
    "PingFang SC", "Hiragino Sans GB", "HarmonyOS Sans SC", "Source Han Sans SC",
    "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* --- 基础重置 ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.is-locked {
  overflow: hidden;
}

h1,
h2,
h3,
h4,
p,
figure,
ul,
ol {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

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

img,
svg {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

::selection {
  background: rgba(0, 113, 227, 0.22);
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 999;
  padding: 10px 18px;
  background: #fff;
  border-radius: 0 0 8px 8px;
  font-size: 14px;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* --- 布局工具 ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: clamp(76px, 9vw, 132px) 0;
}

.section--mist {
  background: var(--mist);
}

.section--dark {
  background: var(--ink);
  color: var(--on-dark);
}

.section--tight {
  padding: clamp(48px, 6vw, 80px) 0;
}

/* --- 排版 ---------------------------------------------------------------- */
.eyebrow {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--blue);
  margin-bottom: 18px;
}

.eyebrow--on-dark {
  color: var(--blue-dark);
}

.h1 {
  font-size: clamp(42px, 6.4vw, 84px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 600;
}

.h2 {
  font-size: clamp(32px, 4.4vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.018em;
  font-weight: 600;
}

.h3 {
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 600;
}

.lede {
  margin-top: 22px;
  max-width: 640px;
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.55;
  color: var(--gray-1);
  letter-spacing: 0.002em;
}

.section--dark .lede {
  color: var(--on-dark-2);
}

.note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-2);
}

.section--dark .note {
  color: var(--on-dark-3);
}

/* --- 按钮与链接 ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 980px;
  background: var(--blue);
  color: #fff;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: background 0.3s var(--ease), transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
  will-change: transform;
}

.btn:hover {
  background: var(--blue-hover);
}

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

.btn--ghost {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--ink);
}

.btn--ghost:hover {
  background: rgba(0, 0, 0, 0.04);
}

.btn--on-dark {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.42);
  color: #fff;
}

.btn--on-dark:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn--light {
  background: #fff;
  color: var(--ink);
}

.btn--light:hover {
  background: rgba(255, 255, 255, 0.86);
}

.link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 17px;
  color: var(--blue);
  transition: opacity 0.25s var(--ease);
}

.link:hover {
  opacity: 0.72;
}

.link--on-dark {
  color: var(--blue-dark);
}

.link__arrow {
  font-size: 1.15em;
  line-height: 1;
  transform: translateY(-0.5px);
  transition: transform 0.3s var(--ease);
}

.link:hover .link__arrow {
  transform: translate(3px, -0.5px);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 26px;
  margin-top: 36px;
}

/* --- 导航 ---------------------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(251, 251, 253, 0.72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.nav.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(251, 251, 253, 0.86);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  max-width: var(--maxw);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand__mark {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(
    circle at 32% 26%,
    #fff 0%,
    #eaf0f7 8%,
    #b9c6d6 26%,
    #6c7b8e 52%,
    #2a313c 76%,
    #0a0d12 100%
  );
  box-shadow: inset -1px -1px 3px rgba(0, 0, 0, 0.5),
    0 1px 3px rgba(0, 0, 0, 0.18);
  flex-shrink: 0;
}

.brand__logo {
  display: block;
  width: 24px;
  height: 24px;
  object-fit: contain;
  flex-shrink: 0;
  /* 商标原图为黑色，浅色背景上直接可用 */
}

.brand__name {
  display: flex;
  align-items: baseline;
  gap: 7px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand__sub {
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--gray-2);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
}

.nav__menu a {
  position: relative;
  font-size: 13.5px;
  color: rgba(0, 0, 0, 0.78);
  letter-spacing: 0.01em;
  transition: color 0.25s var(--ease);
}

.nav__menu a:hover {
  color: var(--ink);
}

.nav__menu a.is-active {
  color: var(--ink);
  font-weight: 500;
}

.nav__menu a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}

.nav__menu a:hover::after,
.nav__menu a.is-active::after {
  transform: scaleX(1);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 8px;
}

/* 语言切换 */
.lang {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border-radius: 980px;
  background: rgba(0, 0, 0, 0.05);
}

.lang a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  padding: 4px 9px;
  border-radius: 980px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--gray-2);
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

.lang a:hover {
  color: var(--ink);
}

.lang a.is-active {
  background: #fff;
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.nav__cta {
  padding: 7px 16px;
  border-radius: 980px;
  background: rgba(0, 113, 227, 0.1);
  color: var(--blue);
  font-size: 12.5px;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.25s var(--ease);
}

.nav__cta:hover {
  background: rgba(0, 113, 227, 0.16);
}

.nav__toggle {
  display: none;
  width: 30px;
  height: 30px;
  position: relative;
}

.nav__toggle span {
  position: absolute;
  left: 5px;
  width: 20px;
  height: 1.5px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.35s var(--ease), opacity 0.25s var(--ease);
}

.nav__toggle span:first-child {
  top: 12px;
}

.nav__toggle span:last-child {
  top: 18px;
}

.nav__toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

/* --- 首页 Hero ----------------------------------------------------------- */
.hero {
  position: relative;
  margin: 10px 10px 0;
  border-radius: var(--r-lg);
  background: #000;
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}

.hero__glow {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(52% 46% at 76% 44%, rgba(46, 108, 255, 0.22), transparent 70%),
    radial-gradient(40% 36% at 18% 92%, rgba(120, 146, 178, 0.16), transparent 72%);
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.35;
  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: 88px 88px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 40%, #000, transparent 78%);
  mask-image: radial-gradient(70% 60% at 50% 40%, #000, transparent 78%);
}

.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  align-items: center;
  gap: 24px;
  max-width: var(--maxw);
  min-height: min(76vh, 680px);
  margin: 0 auto;
  padding: clamp(48px, 7vw, 96px) 24px;
}

.hero__title {
  font-size: clamp(48px, 7.6vw, 100px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  font-weight: 600;
}

.hero__lede {
  margin-top: 26px;
  max-width: 30em;
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.66);
}

.hero__art {
  position: relative;
  height: clamp(280px, 34vw, 440px);
}

.hero__foot {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  align-items: center;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px 34px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.46);
  letter-spacing: 0.03em;
}

.hero__foot span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero__foot span::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
}

/* --- 球体视觉 ------------------------------------------------------------ */
.orb {
  position: relative;
  border-radius: 50%;
  aspect-ratio: 1;
  background: radial-gradient(
    circle at var(--lx, 32%) var(--ly, 25%),
    var(--s1) 0%,
    var(--s2) 7%,
    var(--s3) 21%,
    var(--s4) 40%,
    var(--s5) 58%,
    var(--s6) 76%,
    var(--s7) 100%
  );
  box-shadow: inset -14px -18px 46px rgba(0, 0, 0, 0.55),
    inset 8px 10px 30px rgba(255, 255, 255, 0.16),
    0 40px 70px -28px rgba(0, 0, 0, 0.85);
}

.orb::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(
      46% 32% at 30% 20%,
      rgba(255, 255, 255, 0.92),
      rgba(255, 255, 255, 0) 62%
    ),
    radial-gradient(
      60% 40% at 74% 88%,
      rgba(150, 190, 255, 0.16),
      rgba(255, 255, 255, 0) 70%
    );
  mix-blend-mode: screen;
}

.orb::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.07);
  background: radial-gradient(
    70% 70% at 68% 74%,
    transparent 55%,
    rgba(255, 255, 255, 0.05) 78%,
    transparent 88%
  );
}

.orb--steel {
  --s1: #ffffff;
  --s2: #eef3f9;
  --s3: #c6d3e2;
  --s4: #8294a9;
  --s5: #414c5c;
  --s6: #171c24;
  --s7: #04060a;
}

.orb--ceramic {
  --lx: 36%;
  --ly: 28%;
  --s1: #ffffff;
  --s2: #fdfaf4;
  --s3: #efe9dd;
  --s4: #d6cdbd;
  --s5: #a89d8b;
  --s6: #6b6356;
  --s7: #2c2820;
  box-shadow: inset -12px -16px 38px rgba(60, 50, 34, 0.5),
    inset 8px 10px 28px rgba(255, 255, 255, 0.5),
    0 40px 70px -28px rgba(0, 0, 0, 0.6);
}

.orb--stainless {
  --s1: #ffffff;
  --s2: #f6f8fa;
  --s3: #e2e7ec;
  --s4: #bcc4cd;
  --s5: #8d959e;
  --s6: #555c64;
  --s7: #1e2227;
}

/* 拉丝质感 */
.orb--stainless .orb__brushed {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: repeating-conic-gradient(
    from 0deg at 50% 50%,
    rgba(255, 255, 255, 0.1) 0deg 0.6deg,
    rgba(0, 0, 0, 0.05) 0.6deg 1.2deg
  );
  mix-blend-mode: overlay;
  opacity: 0.55;
}

.orb__shadow {
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: -7%;
  height: 14%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(0, 0, 0, 0.5), transparent);
  filter: blur(8px);
}

.orb--hero {
  --float-y: -50%;
  position: absolute;
  right: 6%;
  top: 50%;
  width: clamp(210px, 26vw, 340px);
  transform: translateY(-50%);
  animation: float 9s ease-in-out infinite;
}

.orb--hero2 {
  position: absolute;
  left: 2%;
  bottom: 6%;
  width: clamp(80px, 9vw, 120px);
  animation: float 11s ease-in-out infinite reverse;
}

.orb--hero3 {
  position: absolute;
  right: 0;
  bottom: 2%;
  width: clamp(44px, 5vw, 62px);
  animation: float 7s ease-in-out infinite;
}

.tile__art {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 52%;
  aspect-ratio: 1;
  pointer-events: none;
}

.tile--wire .tile__art {
  right: -12%;
  bottom: -30%;
  width: 64%;
}

.coil {
  display: block;
  width: 100%;
  height: auto;
  opacity: 0.92;
  transition: transform 0.9s var(--ease-out);
}

.tile:hover .coil {
  transform: translate(-4%, -4%) rotate(-2deg);
}

.orb--tile {
  position: absolute;
  right: -16%;
  bottom: -28%;
  width: 84%;
  transition: transform 0.9s var(--ease-out);
}

.tile:hover .orb--tile {
  transform: translate(-6%, -6%) scale(1.04);
}

.orb--figure {
  width: min(340px, 62%);
  margin: 0 auto;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(var(--float-y, 0));
  }
  50% {
    transform: translateY(calc(var(--float-y, 0px) - 14px));
  }
}

/* --- 数据条 -------------------------------------------------------------- */
.stats {
  border-bottom: 1px solid var(--line);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  padding: 0 24px;
}

.stat {
  padding: clamp(28px, 3.4vw, 44px) 8px clamp(28px, 3.4vw, 44px) 0;
}

.stat + .stat {
  border-left: 1px solid var(--line);
  padding-left: clamp(16px, 2.4vw, 32px);
}

.stat__num {
  display: block;
  font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.stat__unit {
  font-size: 0.55em;
  font-weight: 500;
  margin-left: 5px;
  color: var(--gray-1);
}

.stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--gray-2);
  letter-spacing: 0.02em;
}

/* --- 产品磁贴 ------------------------------------------------------------ */
.tiles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(36px, 4vw, 56px);
}

.tile {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: clamp(300px, 30vw, 380px);
  padding: clamp(26px, 2.8vw, 38px);
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.6s var(--ease-out), box-shadow 0.6s var(--ease-out);
}

.tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 60px -34px rgba(0, 0, 0, 0.35);
}

.tile--dark {
  background: linear-gradient(160deg, #16181d 0%, #0a0b0e 62%, #0a0b0e 100%);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--on-dark);
}

.tile--steel {
  background: linear-gradient(165deg, #f7f8fa 0%, #e8ecf1 55%, #dfe4ea 100%);
}

.tile--sand {
  background: linear-gradient(165deg, #f8f5ee 0%, #eee9df 60%, #e5dfd3 100%);
}

.tile__body {
  position: relative;
  z-index: 2;
  max-width: 68%;
}

.tile__kicker {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--gray-2);
  margin-bottom: 10px;
}

.tile--dark .tile__kicker {
  color: var(--on-dark-3);
}

.tile__title {
  font-size: clamp(24px, 2.5vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.018em;
  font-weight: 600;
}

.tile__desc {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--gray-1);
}

.tile--dark .tile__desc {
  color: var(--on-dark-2);
}

.tile__foot {
  position: relative;
  z-index: 2;
  margin-top: 26px;
  font-size: 15px;
  color: var(--blue);
}

.tile--dark .tile__foot {
  color: var(--blue-dark);
}

.tile__text {
  margin-top: auto;
  padding-top: 28px;
  position: relative;
  z-index: 2;
}

/* --- 分栏 ---------------------------------------------------------------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  align-items: center;
  gap: clamp(40px, 6vw, 90px);
}

.split--reverse {
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
}

.split--reverse .split__art {
  order: -1;
}

.split__art {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(10px, 2vw, 20px);
}

/* --- 检测项列表 ---------------------------------------------------------- */
.checks {
  display: grid;
  gap: 0;
  margin-top: 40px;
  border-top: 1px solid var(--line-dark);
}

.checks li {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-dark);
  font-size: 15px;
  line-height: 1.65;
  color: var(--on-dark-2);
}

.checks strong {
  font-weight: 500;
  color: #fff;
  font-size: 15px;
  letter-spacing: 0.01em;
}

.checks--light {
  border-top-color: var(--line);
}

.checks--light li {
  border-bottom-color: var(--line);
  color: var(--gray-1);
}

.checks--light strong {
  color: var(--ink);
}

/* --- 三卡 ---------------------------------------------------------------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(36px, 4vw, 52px);
}

.cards--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  padding: clamp(24px, 2.6vw, 34px);
  border-radius: var(--r-md);
  background: #fff;
  border: 1px solid var(--line);
}

.section--dark .card {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.1);
}

.card__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--blue);
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.section--dark .card__num {
  color: var(--blue-dark);
}

.card__title {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.008em;
  margin-bottom: 10px;
}

.card__text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--gray-1);
}

.section--dark .card__text {
  color: var(--on-dark-2);
}

/* --- 应用领域 ------------------------------------------------------------ */
.apps {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
}

.apps li {
  padding: 10px 20px;
  border-radius: 980px;
  border: 1px solid var(--line-strong);
  font-size: 14.5px;
  color: var(--gray-1);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease),
    background 0.3s var(--ease);
}

.apps li:hover {
  color: var(--ink);
  border-color: rgba(0, 0, 0, 0.3);
  background: rgba(0, 0, 0, 0.03);
}

/* --- 页面头部（内页） ---------------------------------------------------- */
.page-hero {
  padding: clamp(64px, 8vw, 110px) 0 clamp(32px, 4vw, 52px);
}

.page-hero__title {
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-weight: 600;
}

.page-hero__lede {
  margin-top: 24px;
  max-width: 620px;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.65;
  color: var(--gray-1);
}

/* --- 产品页：吸顶分类 ---------------------------------------------------- */
.subnav {
  position: sticky;
  top: var(--nav-h);
  z-index: 60;
  background: rgba(245, 245, 247, 0.82);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}

.subnav__inner {
  display: flex;
  gap: 8px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 24px;
  overflow-x: auto;
  scrollbar-width: none;
}

.subnav__inner::-webkit-scrollbar {
  display: none;
}

.chip {
  flex-shrink: 0;
  padding: 8px 16px;
  border-radius: 980px;
  font-size: 13.5px;
  color: var(--gray-1);
  border: 1px solid transparent;
  transition: all 0.3s var(--ease);
}

.chip:hover {
  color: var(--ink);
  background: rgba(0, 0, 0, 0.05);
}

.chip.is-active {
  color: var(--ink);
  background: #fff;
  border-color: var(--line-strong);
  font-weight: 500;
}

/* --- 产品详情 ------------------------------------------------------------ */
.product {
  scroll-margin-top: calc(var(--nav-h) + 60px);
  padding: clamp(64px, 8vw, 110px) 0;
  border-bottom: 1px solid var(--line);
}

.product__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

.product__index {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--gray-3);
  font-variant-numeric: tabular-nums;
  margin-bottom: 18px;
}

.product__title {
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.022em;
  font-weight: 600;
}

.product__sub {
  margin-top: 10px;
  font-size: clamp(15px, 1.4vw, 18px);
  color: var(--gray-2);
  letter-spacing: 0.01em;
}

.product__desc {
  margin-top: 24px;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--gray-1);
  max-width: 44em;
}

.product__points {
  display: grid;
  gap: 0;
  margin-top: 32px;
  border-top: 1px solid var(--line);
}

.product__points li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  color: var(--gray-1);
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 14px;
}

.product__points strong {
  font-weight: 500;
  color: var(--ink);
  font-size: 15px;
}

.product__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
  margin-top: clamp(36px, 4vw, 56px);
}

.product__side {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}

.product__side .orb {
  width: min(260px, 68%);
}

.product__aside {
  width: 100%;
  padding: 22px 24px;
  border-radius: var(--r-md);
  background: var(--mist);
  border: 1px solid var(--line);
}

.section--mist .product__aside {
  background: #fff;
}

.product__aside h4 {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gray-2);
  font-weight: 500;
  margin-bottom: 10px;
}

.product__aside p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-1);
}

/* --- 微信二维码卡片 ------------------------------------------------------ */
.qr-card {
  display: grid;
  grid-template-columns: 156px minmax(0, 1fr);
  gap: 22px;
  align-items: center;
  margin-top: 30px;
  padding: 20px;
  border-radius: var(--r-md);
  background: #fff;
  border: 1px solid var(--line);
}

.qr-card__img {
  width: 156px;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

.qr-card h4 {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gray-2);
  font-weight: 500;
  margin-bottom: 8px;
}

.qr-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-1);
}

.qr-card strong {
  color: var(--ink);
  font-weight: 500;
}

/* --- 实拍图（替代 CSS 球体） -------------------------------------------- */
.orb-photo {
  display: block;
  width: min(330px, 66%);
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
  background: #f0f2f5;
  box-shadow: 0 40px 70px -34px rgba(0, 0, 0, 0.45);
}

/* --- 信任条 -------------------------------------------------------------- */
.trust {
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.trust__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 15px 24px;
}

.trust__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 22px;
  font-size: 13px;
  color: var(--gray-1);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.trust__item + .trust__item {
  border-left: 1px solid var(--line);
}

.trust__item svg {
  flex: none;
  width: 14px;
  height: 14px;
  color: var(--blue);
}

/* --- 资质证书 ------------------------------------------------------------ */
.certs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(32px, 4vw, 48px);
}

.cert {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--r-md);
  background: #fff;
  border: 1px solid var(--line);
  transition: transform 0.5s var(--ease-out), box-shadow 0.5s var(--ease-out);
}

.cert:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 48px -30px rgba(0, 0, 0, 0.3);
}

.cert__img {
  display: block;
  width: 100%;
  height: clamp(200px, 24vw, 300px);
  object-fit: contain;
  object-position: center top;
  padding: 16px;
  background: #f5f5f7;
}

.cert__body {
  padding: 18px 22px 22px;
}

.cert__body h3 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin-bottom: 8px;
}

.cert__body p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray-2);
}

.cert__body span {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--gray-3);
  font-variant-numeric: tabular-nums;
}

/* --- 规格对照表 ---------------------------------------------------------- */
.table-wrap {
  margin-top: 26px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  -webkit-overflow-scrolling: touch;
}

table.grid {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 14px;
  white-space: nowrap;
}

table.grid th,
table.grid td {
  padding: 11px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

table.grid thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #fff;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--gray-2);
}

table.grid tbody tr:last-child td {
  border-bottom: 0;
}

table.grid tbody tr:hover {
  background: #fafafa;
}

table.grid td.num,
table.grid th.num {
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* 型号列表可能很长，允许换行，避免把数值列挤出可视区 */
table.grid td:nth-child(3),
table.grid th:nth-child(3) {
  white-space: normal;
  min-width: 260px;
  line-height: 1.65;
  color: var(--gray-1);
}

@media (max-width: 860px) {
  .certs {
    grid-template-columns: 1fr;
  }

  .trust__item + .trust__item {
    border-left: 0;
  }
}

.photo-wide {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-md);
  object-fit: cover;
}

.spec {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  margin-top: 10px;
}

.spec caption {
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gray-3);
  padding-bottom: 14px;
}

.spec th,
.spec td {
  text-align: left;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.spec th {
  width: 34%;
  font-weight: 400;
  color: var(--gray-2);
  padding-right: 18px;
}

.spec td {
  color: var(--ink);
}

.spec--dark th {
  color: var(--on-dark-3);
}

.spec--dark td {
  color: var(--on-dark);
}

.spec--dark th,
.spec--dark td {
  border-bottom-color: var(--line-dark);
}

.spec--dark caption {
  color: var(--on-dark-3);
}

.todo {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 4px;
  background: rgba(255, 159, 10, 0.14);
  color: #b26a00;
  font-size: 0.92em;
  border: 1px dashed rgba(178, 106, 0, 0.5);
}

.section--dark .todo {
  background: rgba(255, 179, 64, 0.14);
  color: #ffb340;
  border-color: rgba(255, 179, 64, 0.4);
}

/* --- 退火对比 ------------------------------------------------------------ */
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 28px;
}

.compare__box {
  padding: 22px 24px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: #fff;
}

.compare__box h4 {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gray-2);
  margin-bottom: 10px;
  font-weight: 500;
}

.compare__box p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

/* --- 关于页 时间线 -------------------------------------------------------- */
.timeline {
  position: relative;
  margin-top: 48px;
  padding-left: 26px;
  border-left: 1px solid var(--line-strong);
}

.timeline li {
  position: relative;
  padding: 0 0 38px 0;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #fff;
  border: 1.5px solid var(--gray-2);
}

.timeline li:last-child {
  padding-bottom: 0;
}

.timeline li:last-child::before {
  background: var(--blue);
  border-color: var(--blue);
}

.timeline__year {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gray-2);
  font-variant-numeric: tabular-nums;
  margin-bottom: 6px;
}

.timeline__title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.timeline__text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--gray-1);
  max-width: 46em;
}

/* --- CTA 区 -------------------------------------------------------------- */
.cta {
  text-align: center;
}

.cta .h2 {
  max-width: 18em;
  margin: 0 auto;
}

.cta .lede {
  margin: 22px auto 0;
  max-width: 40em;
}

.cta .actions {
  justify-content: center;
}

/* --- 联系页 -------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}

.info-list {
  border-top: 1px solid var(--line-strong);
  margin-top: 34px;
}

.info-list li {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.info-list dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gray-2);
  margin-bottom: 6px;
}

.info-list dd {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.6;
}

.info-list dd a {
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease);
}

.info-list dd a:hover {
  border-bottom-color: currentColor;
}

.copy-btn {
  margin-left: 8px;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 12px;
  color: var(--gray-2);
  border: 1px solid var(--line-strong);
  vertical-align: 1px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease),
    background 0.25s var(--ease);
}

.copy-btn:hover {
  color: var(--ink);
  border-color: var(--gray-3);
  background: rgba(0, 0, 0, 0.03);
}

.form {
  padding: clamp(24px, 3vw, 36px);
  border-radius: var(--r-lg);
  background: var(--mist);
  border: 1px solid var(--line);
}

.form__title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 6px;
}

.form__hint {
  font-size: 13.5px;
  color: var(--gray-2);
  margin-bottom: 26px;
  line-height: 1.6;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 13px;
  color: var(--gray-1);
  margin-bottom: 7px;
  letter-spacing: 0.02em;
}

.field label span {
  color: var(--blue);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
  -webkit-appearance: none;
  appearance: none;
}

.field textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.6;
}

.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2386868b' stroke-width='1.4' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 34px;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.14);
}

.field--row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 22px;
}

.form__status {
  font-size: 13.5px;
  line-height: 1.6;
  color: #1a7f37;
  min-height: 1.4em;
  flex: 1 1 100%;
}

.form__status.is-error {
  color: #c0392b;
}

/* --- 页脚 ---------------------------------------------------------------- */
.footer {
  background: var(--mist);
  border-top: 1px solid var(--line);
  padding: clamp(48px, 6vw, 72px) 0 34px;
  font-size: 13px;
  color: var(--gray-1);
}

.footer__top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
}

.footer__addr {
  line-height: 1.8;
  color: var(--gray-2);
  max-width: 26em;
}

.footer h4 {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gray-2);
  margin-bottom: 14px;
  font-weight: 500;
}

.footer li {
  margin-bottom: 9px;
}

.footer li a {
  transition: color 0.25s var(--ease);
}

.footer li a:hover {
  color: var(--ink);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--gray-2);
}

.footer__bottom nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

/* --- 滚动动效（仅在 JS 可用时隐藏，保证无脚本也能看到内容） -------------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  transition-delay: var(--d, 0ms);
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* --- 响应式 -------------------------------------------------------------- */
@media (max-width: 1024px) {
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat:nth-child(3),
  .stat:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .stat:nth-child(3) {
    border-left: 0;
    padding-left: 0;
  }

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

  .checks li {
    grid-template-columns: 130px 1fr;
  }
}

@media (max-width: 860px) {
  .hero__inner {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-top: clamp(40px, 9vw, 64px);
  }

  .hero__art {
    height: clamp(230px, 52vw, 340px);
    margin-top: 8px;
    order: 2;
  }

  .orb--hero {
    right: 4%;
    width: clamp(180px, 44vw, 260px);
  }

  .tiles,
  .split,
  .product__head,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .split--reverse .split__art {
    order: 0;
  }

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

  .tile__body {
    max-width: 88%;
  }

  .split__art {
    order: -1;
  }

  .orb--figure {
    width: min(300px, 58%);
  }

  .split__art svg {
    max-width: 360px;
    margin: 0 auto;
  }

  .checks li,
  .product__points li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

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

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  :root {
    --nav-h: 52px;
  }

  .nav__inner {
    gap: 16px;
  }

  .brand__sub {
    display: none;
  }

  .nav__menu {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    display: block;
    margin: 0;
    padding: 8px 24px 28px;
    background: rgba(251, 251, 253, 0.97);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--line);
    transform-origin: top;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease),
      visibility 0.3s;
  }

  .nav__menu.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav__menu a {
    display: block;
    padding: 15px 0;
    font-size: 19px;
    border-bottom: 1px solid var(--line);
  }

  .nav__menu a::after {
    display: none;
  }

  .nav__menu a:last-child {
    border-bottom: 0;
  }

  .nav__toggle {
    display: block;
  }

  .nav__actions {
    margin-left: auto;
    gap: 8px;
  }

  .lang a {
    min-width: 30px;
    padding: 4px 7px;
    font-size: 11.5px;
  }

  .qr-card {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .nav__cta {
    display: none;
  }

  .stat__num {
    font-size: 21px;
    letter-spacing: -0.01em;
  }

  .stat__label {
    font-size: 12px;
  }

  .hero {
    margin: 8px 8px 0;
    border-radius: 22px;
  }

  .hero__foot {
    padding-bottom: 26px;
    gap: 8px 18px;
  }

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

  .tile {
    min-height: 280px;
    border-radius: 22px;
  }

  .tile__body {
    max-width: 92%;
  }

  .tile__art {
    width: 46%;
    right: -6%;
    bottom: -6%;
  }

  .tile--wire .tile__art {
    width: 54%;
    right: -8%;
    bottom: -18%;
  }

  .form {
    border-radius: 22px;
  }

  .field--row {
    grid-template-columns: 1fr;
  }

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

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* --- 工艺流程 ------------------------------------------------------------ */
.flow {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  margin-top: clamp(36px, 4vw, 56px);
}

.flow__item {
  position: relative;
  padding: 30px 18px 0 0;
}

.flow__item::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 9px;
  right: 0;
  height: 1px;
  background: var(--line-strong);
}

.flow__item:last-child::before {
  display: none;
}

.flow__dot {
  position: absolute;
  top: 2px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #fff;
  border: 1.5px solid var(--blue);
  box-sizing: border-box;
}

.flow__item:last-child .flow__dot {
  background: var(--blue);
}

.flow__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gray-3);
  font-variant-numeric: tabular-nums;
  margin-bottom: 6px;
}

.flow__name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.005em;
  line-height: 1.35;
}

.flow__desc {
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--gray-2);
}

/* --- FAQ ----------------------------------------------------------------- */
.faq {
  margin-top: clamp(32px, 4vw, 48px);
  border-top: 1px solid var(--line-strong);
}

.faq__item {
  border-bottom: 1px solid var(--line);
}

.faq__q {
  display: flex;
  gap: 14px;
  padding: 22px 0;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.005em;
  cursor: pointer;
  list-style: none;
}

.faq__q::-webkit-details-marker {
  display: none;
}

.faq__q::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--blue);
  opacity: 0.85;
}

.faq__q::after {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: 6px;
  margin-left: auto;
  border-right: 1.5px solid var(--gray-2);
  border-bottom: 1.5px solid var(--gray-2);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease);
}

.faq__item[open] .faq__q::after {
  transform: rotate(-135deg);
}

.faq__a {
  padding: 0 0 22px 21px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray-1);
  max-width: 46em;
}

.faq__a a {
  color: var(--blue);
}

@media (max-width: 860px) {
  .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 18px;
  }

  .flow__item {
    padding: 26px 0 0 0;
  }

  .flow__item::before {
    left: 9px;
    right: 0;
  }
}

/* --- 移动端底部操作条 ---------------------------------------------------- */
.mobile-bar {
  display: none;
}

@media (max-width: 720px) {
  .mobile-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    background: rgba(255, 255, 255, 0.94);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);
    border-top: 1px solid var(--line);
    padding-bottom: env(safe-area-inset-bottom);
  }

  .mobile-bar a {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 9px 0 10px;
    font-size: 11px;
    letter-spacing: 0.02em;
    color: var(--ink);
  }

  .mobile-bar a + a {
    border-left: 1px solid var(--line);
  }

  .mobile-bar svg {
    width: 19px;
    height: 19px;
    color: var(--gray-1);
  }

  .mobile-bar .is-primary,
  .mobile-bar .is-primary svg {
    color: var(--blue);
  }

  body {
    padding-bottom: calc(58px + env(safe-area-inset-bottom));
  }
}

/* --- 404 ---------------------------------------------------------------- */
.page-404 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 62vh;
  text-align: center;
}

.page-404 .h1 {
  font-size: clamp(64px, 12vw, 120px);
  color: var(--gray-3);
  letter-spacing: -0.04em;
}
/* --- 打印 ---------------------------------------------------------------- */
@media print {
  .nav,
  .subnav,
  .hero__art,
  .footer__bottom nav {
    display: none;
  }

  body {
    font-size: 12pt;
  }

  .section,
  .product {
    padding: 18pt 0;
    break-inside: avoid;
  }
}

/* --- 在线估算器 ---------------------------------------------------------- */
.calc {
  margin-top: clamp(30px, 3.4vw, 42px);
  padding: clamp(24px, 3vw, 38px);
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
}

.section--mist .calc {
  background: #fff;
}

.calc__inputs {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 14px;
}

.calc__inputs label {
  display: block;
  font-size: 13px;
  color: var(--gray-1);
  letter-spacing: 0.02em;
}

.calc__inputs input,
.calc__inputs select {
  width: 100%;
  margin-top: 7px;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 16px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  -webkit-appearance: none;
  appearance: none;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.calc__inputs select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2386868b' stroke-width='1.4' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 34px;
}

.calc__inputs input:focus,
.calc__inputs select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.14);
}

.calc__result {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.calc__result span {
  display: block;
  font-size: 12px;
  color: var(--gray-2);
  letter-spacing: 0.04em;
}

.calc__result strong {
  display: inline-block;
  margin-top: 6px;
  font-size: clamp(23px, 2.5vw, 31px);
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.calc__result small {
  font-size: 13px;
  color: var(--gray-2);
  margin-left: 4px;
}

.calc__note {
  margin-top: 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray-2);
}

.calc .actions {
  margin-top: 24px;
}

@media (max-width: 860px) {
  .calc__inputs {
    grid-template-columns: 1fr 1fr;
  }

  .calc__result {
    grid-template-columns: 1fr 1fr;
    gap: 20px 14px;
  }
}

@media (max-width: 520px) {
  .calc__inputs {
    grid-template-columns: 1fr;
  }
}