/* ==========================================================================
   泰科纶 TAIKELUN — Flame Retardant Protective Fabrics
   Design system: industrial / technical / high-temperature
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  --black: #0a0a0b;
  --coal: #131417;
  --smoke: #1c1e22;
  --graphite: #2a2d33;
  --bone: #f5f2ec;
  --bone-2: #e9e4da;
  --white: #ffffff;

  --amber: #eb623a;
  --amber-deep: #b23e18;
  --amber-dim: rgba(235, 98, 58, 0.15);
  --ember: #bc3f1b;

  --ash: #8b9098;
  --ash-dark: #5f646c;
  --ink-text: #16181c;

  --line: rgba(10, 10, 11, 0.12);
  --line-soft: rgba(10, 10, 11, 0.07);
  --line-dark: rgba(255, 255, 255, 0.12);
  --line-dark-soft: rgba(255, 255, 255, 0.06);

  --wrap: 1340px;
  --gutter: clamp(20px, 4.4vw, 60px);

  --font: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Roboto Mono", ui-monospace,
    Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.25, 0.6, 0.3, 1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bone);
  color: var(--ink-text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

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

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

table {
  border-collapse: collapse;
  width: 100%;
}

::selection {
  background: var(--amber);
  color: var(--black);
}

/* ---------- 3. Layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(64px, 8vw, 124px);
  position: relative;
}

.section--tight {
  padding-block: clamp(44px, 5.5vw, 76px);
}

.section--dark {
  background: var(--black);
  color: var(--bone);
}

.section--coal {
  background: var(--coal);
  color: var(--bone);
}

.section--bone2 {
  background: var(--bone-2);
}

.section--hairline {
  border-top: 1px solid var(--line);
}

.section--dark.section--hairline,
.section--coal.section--hairline {
  border-top-color: var(--line-dark);
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
  margin: 0;
}

.section--dark .rule,
.section--coal .rule {
  background: var(--line-dark);
}

/* ---------- 4. Typography ---------- */
.kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--amber-deep);
}

.section--dark .kicker,
.section--coal .kicker {
  color: var(--amber);
}

.kicker::after {
  content: "";
  flex: 1;
  height: 1px;
  background: currentColor;
  opacity: 0.28;
}

.kicker--plain::after {
  display: none;
}

.h1 {
  font-size: clamp(2.4rem, 6.4vw, 5.6rem);
  line-height: 0.98;
  font-weight: 700;
  letter-spacing: -0.035em;
}

.h2 {
  font-size: clamp(1.75rem, 3.8vw, 3rem);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.028em;
}

.h3 {
  font-size: clamp(1.1rem, 1.6vw, 1.32rem);
  line-height: 1.42;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.lead {
  font-size: clamp(0.98rem, 1.3vw, 1.1rem);
  line-height: 1.82;
  color: var(--ash-dark);
  max-width: 62ch;
}

.section--dark .lead,
.section--coal .lead {
  color: #a7adb5;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.small {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ash-dark);
}

.section--dark .small,
.section--coal .small {
  color: var(--ash);
}

.head {
  display: grid;
  gap: 22px;
  margin-bottom: clamp(30px, 4vw, 56px);
}

@media (min-width: 940px) {
  .head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: 64px;
    align-items: end;
  }
}

.head .lead {
  padding-bottom: 6px;
}

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 15px 26px;
  border: 1px solid var(--amber);
  background: var(--amber);
  color: var(--black);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease),
    border-color 0.25s var(--ease), transform 0.25s var(--ease);
  border-radius: 1px;
}

.btn:hover {
  background: var(--bone);
  border-color: var(--bone);
  transform: translateY(-2px);
}

.btn .arw {
  transition: transform 0.3s var(--ease);
}

.btn:hover .arw {
  transform: translateX(4px);
}

.btn--line {
  background: transparent;
  border-color: rgba(10, 10, 11, 0.3);
  color: var(--ink-text);
}

.btn--line:hover {
  background: var(--black);
  border-color: var(--black);
  color: var(--bone);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--bone);
}

.btn--ghost:hover {
  background: var(--bone);
  border-color: var(--bone);
  color: var(--black);
}

.tlink {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber-deep);
  padding-bottom: 4px;
  border-bottom: 1px solid currentColor;
  transition: gap 0.25s var(--ease), opacity 0.25s;
}

.tlink:hover {
  gap: 16px;
}

.section--dark .tlink,
.section--coal .tlink {
  color: var(--amber);
}

/* ---------- 6. Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
}

.site-header.is-solid {
  background: rgba(10, 10, 11, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--line-dark-soft);
}

.hd {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo__mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--amber);
  color: var(--black);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.03em;
  border-radius: 1px;
}

.logo__txt {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.logo__cn {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--bone);
}

.logo__en {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--ash);
  margin-top: 3px;
}

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav a {
  position: relative;
  padding: 10px 11px;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: rgba(245, 242, 236, 0.88);
  transition: color 0.2s;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 2px;
  height: 1px;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav a:hover,
.nav a.is-on {
  color: var(--bone);
}

.nav a.is-on {
  font-weight: 700;
}

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

.hd__side {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.lang {
  display: flex;
  gap: 6px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ash);
}

.lang .on {
  color: var(--bone);
}

.hd__cta {
  padding: 10px 18px;
  font-size: 13px;
}

.burger {
  display: none;
  width: 42px;
  height: 42px;
  border: 0;
  background: none;
  cursor: pointer;
  padding: 0;
  place-items: center;
  color: var(--bone);
}

.burger i {
  display: block;
  width: 20px;
  height: 1.5px;
  background: currentColor;
  position: relative;
}

.burger i::before,
.burger i::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.3s var(--ease), top 0.3s var(--ease);
}

.burger i::before {
  top: -6px;
}

.burger i::after {
  top: 6px;
}

body.is-open .burger i {
  background: transparent;
}

body.is-open .burger i::before {
  top: 0;
  transform: rotate(45deg);
}

body.is-open .burger i::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (max-width: 1240px) {
  .nav {
    position: fixed;
    inset: 76px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--black);
    padding: 8px var(--gutter) 26px;
    max-height: calc(100vh - 76px);
    overflow-y: auto;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
    border-bottom: 1px solid var(--line-dark-soft);
  }

  body.is-open .nav {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .nav a {
    padding: 16px 2px;
    border-bottom: 1px solid var(--line-dark-soft);
    color: var(--bone);
    font-size: 16px;
    font-weight: 600;
  }

  body[data-lang="en"] .nav a {
    font-size: 15.5px;
  }

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

  .burger {
    display: grid;
  }

  .hd__cta {
    display: none;
  }

  /* 导航收起为抽屉后，页头只剩 logo + 语言切换 + 菜单按钮，
     用 auto 外边距把后两者推到右侧，避免紧贴 logo */
  .hd__side {
    margin-left: auto;
  }
}



/* ---------- 7. Hero ---------- */
.hero {
  position: relative;
  background: var(--black);
  color: var(--bone);
  overflow: hidden;
  isolation: isolate;
  padding-top: 76px;
}

/* technical grid + ember glow */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: linear-gradient(
      to right,
      rgba(255, 255, 255, 0.045) 1px,
      transparent 1px
    ),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 12%, transparent 72%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(
      62% 52% at 76% 8%,
      rgba(235, 98, 58, 0.2),
      transparent 70%
    ),
    radial-gradient(48% 40% at 12% 96%, rgba(235, 98, 58, 0.10), transparent 72%);
}

.hero__in {
  padding-block: clamp(56px, 8vw, 104px);
}

.hero__top {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  align-items: center;
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line-dark-soft);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ash);
}

.hero__top b {
  color: var(--amber);
  font-weight: 500;
}

.hero__body {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  padding-top: clamp(36px, 5vw, 64px);
}

@media (min-width: 980px) {
  .hero__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: end;
  }
}

.hero h1 {
  font-size: clamp(2.6rem, 7vw, 6rem);
  line-height: 0.94;
  font-weight: 700;
  letter-spacing: -0.04em;
  margin-top: 22px;
}

.hero h1 em {
  font-style: normal;
  color: var(--amber);
}

.hero__desc {
  margin-top: 26px;
  max-width: 52ch;
  font-size: clamp(0.98rem, 1.35vw, 1.12rem);
  line-height: 1.8;
  color: rgba(245, 242, 236, 0.72);
}

.hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

/* heat scale widget */
.heat {
  padding: 22px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.02);
}

.heat__t {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ash);
  margin-bottom: 16px;
}

.heat__bar {
  height: 6px;
  background: linear-gradient(
    to right,
    #3a3d44 0%,
    #8a3517 25%,
    #c2431d 50%,
    #eb623a 75%,
    #6b190c 100%
  );
  position: relative;
}

.heat__marks {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ash);
  letter-spacing: 0.06em;
}

.heat__row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-dark-soft);
  font-size: 13px;
}

.heat__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.heat__row span {
  color: var(--ash);
}

.heat__row b {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--bone);
}

/* page hero (inner) */
.phero {
  background: var(--black);
  color: var(--bone);
  padding-top: 76px;
  position: relative;
  overflow: hidden;
}

.phero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(
    58% 70% at 82% 0%,
    rgba(235, 98, 58, 0.16),
    transparent 68%
  );
}

.phero__in {
  position: relative;
  z-index: 1;
  padding-block: clamp(48px, 6.5vw, 92px);
}

.phero h1 {
  font-size: clamp(2rem, 4.6vw, 3.6rem);
  line-height: 1.04;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-top: 20px;
}

.phero p {
  margin-top: 20px;
  max-width: 64ch;
  color: rgba(245, 242, 236, 0.7);
  line-height: 1.8;
}

.crumb {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 34px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ash);
}

.crumb a:hover {
  color: var(--bone);
}

.crumb i {
  opacity: 0.5;
  font-style: normal;
}

/* ---------- 8. Stat band ---------- */
.band {
  display: grid;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 860px) {
  .band {
    grid-template-columns: repeat(4, 1fr);
  }
}

.section--dark .band,
.section--coal .band {
  border-color: var(--line-dark);
}

.band__c {
  padding: clamp(22px, 2.6vw, 34px) clamp(14px, 2vw, 26px);
  border-right: 1px solid var(--line);
}

.section--dark .band__c,
.section--coal .band__c {
  border-right-color: var(--line-dark);
}

.band__c:nth-child(2n) {
  border-right: 0;
}

@media (min-width: 860px) {
  .band__c:nth-child(2n) {
    border-right: 1px solid var(--line);
  }
  .band__c:last-child {
    border-right: 0;
  }
}

.section--dark .band__c:nth-child(2n),
.section--coal .band__c:nth-child(2n) {
  border-right-color: var(--line-dark);
}

.band__n {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.band__n u {
  text-decoration: none;
  font-size: 0.46em;
  color: var(--amber-deep);
  margin-left: 3px;
}

.section--dark .band__n u,
.section--coal .band__n u {
  color: var(--amber);
}

.band__l {
  display: block;
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--ash-dark);
  letter-spacing: 0.02em;
}

.section--dark .band__l,
.section--coal .band__l {
  color: var(--ash);
}

/* ---------- 9. Product system ---------- */
.plines {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 900px) {
  .plines {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pline {
  background: var(--bone);
  padding: clamp(24px, 2.8vw, 38px);
  display: flex;
  flex-direction: column;
  transition: background 0.4s var(--ease);
  position: relative;
}

.pline:hover {
  background: var(--white);
}

.pline__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--amber-deep);
}

.pline h3 {
  margin-top: 20px;
  font-size: clamp(1.2rem, 1.8vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.pline__en {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ash);
}

.pline p {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ash-dark);
}

.pline ul {
  margin-top: 20px;
  border-top: 1px solid var(--line-soft);
  padding-top: 4px;
}

.pline li {
  font-size: 13.5px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--ash-dark);
}

.pline li:last-child {
  border-bottom: 0;
}

.pline li b {
  font-weight: 600;
  color: var(--ink-text);
}

.pline li em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ash);
  white-space: nowrap;
}

/* product detail cards */
.pgrid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 720px) {
  .pgrid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1120px) {
  .pgrid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pitem {
  background: var(--bone);
  padding: clamp(20px, 2.4vw, 30px);
  transition: background 0.3s var(--ease);
}

.pitem:hover {
  background: var(--white);
}

.pitem__h {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.pitem h4 {
  font-size: 15.5px;
  font-weight: 700;
}

.pitem__code {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--amber-deep);
  white-space: nowrap;
}

.pitem dl {
  margin: 16px 0 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 14px;
  font-size: 13px;
}

.pitem dt {
  color: var(--ash);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.pitem dd {
  margin: 0;
  color: var(--ink-text);
  line-height: 1.6;
}

.ptags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 16px;
}

.ptag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  padding: 4px 9px;
  border: 1px solid var(--line);
  color: var(--ash-dark);
  border-radius: 1px;
}

/* ---------- 10. Standards table ---------- */
.std {
  width: 100%;
  font-size: 13.5px;
  min-width: 680px;
}

.std th {
  text-align: left;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--ash);
  border-bottom: 1px solid var(--line);
  background: var(--bone-2);
}

.std td {
  padding: 15px 18px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}

.std tbody tr:hover td {
  background: rgba(235, 98, 58, 0.06);
}

.std td b {
  font-weight: 600;
}

.std td code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--amber-deep);
}

.std-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--bone);
}

.section--dark .std-wrap,
.section--coal .std-wrap {
  border-color: var(--line-dark);
  background: var(--coal);
}

.section--dark .std th,
.section--coal .std th {
  background: rgba(255, 255, 255, 0.04);
  border-bottom-color: var(--line-dark);
  color: var(--ash);
}

.section--dark .std td,
.section--coal .std td {
  border-bottom-color: var(--line-dark-soft);
  color: #c3c8cf;
}

.section--dark .std td code,
.section--coal .std td code {
  color: var(--amber);
}

/* ---------- 11. Capability rows ---------- */
.caps {
  border-top: 1px solid var(--line);
}

.section--dark .caps,
.section--coal .caps {
  border-top-color: var(--line-dark);
}

.cap {
  display: grid;
  gap: 14px;
  padding: clamp(24px, 3vw, 40px) 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.3s var(--ease);
}

.section--dark .cap,
.section--coal .cap {
  border-bottom-color: var(--line-dark);
}

@media (min-width: 900px) {
  .cap {
    grid-template-columns: 70px minmax(0, 0.42fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
}

.cap__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber-deep);
  padding-top: 5px;
}

.section--dark .cap__no,
.section--coal .cap__no {
  color: var(--amber);
}

.cap h3 {
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.cap p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ash-dark);
}

.section--dark .cap p,
.section--coal .cap p {
  color: #a7adb5;
}

/* ---------- 12. Industry tiles ---------- */
.tiles {
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

@media (min-width: 640px) {
  .tiles {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1020px) {
  .tiles {
    grid-template-columns: repeat(3, 1fr);
  }
}

.tile {
  background: var(--black);
  padding: clamp(24px, 2.6vw, 34px);
  transition: background 0.35s var(--ease);
}

.tile:hover {
  background: var(--smoke);
}

.tile__k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.tile h3 {
  margin-top: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--bone);
}

.tile p {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.75;
  color: #98a0aa;
}

.tile__std {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 16px;
}

.tile__std span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 7px;
  border: 1px solid var(--line-dark);
  color: #98a0aa;
}

/* ---------- 13. Split ---------- */
.split {
  display: grid;
  gap: clamp(26px, 4vw, 60px);
  align-items: center;
}

@media (min-width: 920px) {
  .split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split--media-right > .split__m {
    order: 2;
  }
}

.split__m {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 11;
}

.section--dark .split__m,
.section--coal .split__m {
  border-color: var(--line-dark);
}

.split__m img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.03);
}

.split__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 12px 16px;
  background: rgba(10, 10, 11, 0.82);
  backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone);
}

.checks li {
  position: relative;
  padding-left: 24px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ash-dark);
}

.checks li + li {
  margin-top: 11px;
}

.checks li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 7px;
  height: 7px;
  border: 1.5px solid var(--amber-deep);
}

.section--dark .checks li,
.section--coal .checks li {
  color: #a7adb5;
}

.section--dark .checks li::before,
.section--coal .checks li::before {
  border-color: var(--amber);
}

.stack > * + * {
  margin-top: 18px;
}

.stack-lg > * + * {
  margin-top: 26px;
}

/* ---------- 14. CTA ---------- */
.cta {
  background: var(--amber);
  color: var(--black);
  padding-block: clamp(48px, 6.5vw, 88px);
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      to right,
      rgba(10, 10, 11, 0.06) 1px,
      transparent 1px
    ),
    linear-gradient(to bottom, rgba(10, 10, 11, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.cta__in {
  position: relative;
  display: grid;
  gap: 28px;
  align-items: center;
}

@media (min-width: 900px) {
  .cta__in {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: 48px;
  }
  .cta__acts {
    justify-content: flex-end;
  }
}

.cta h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.028em;
}

.cta p {
  margin-top: 14px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(10, 10, 11, 0.78);
  max-width: 56ch;
}

.cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cta .btn {
  background: var(--black);
  border-color: var(--black);
  color: var(--bone);
}

.cta .btn:hover {
  background: var(--bone);
  border-color: var(--bone);
  color: var(--black);
}

.cta .btn--line {
  background: transparent;
  border-color: rgba(10, 10, 11, 0.35);
  color: var(--black);
}

.cta .btn--line:hover {
  background: var(--black);
  border-color: var(--black);
  color: var(--bone);
}

/* ---------- 15. Footer ---------- */
.ft {
  background: var(--black);
  color: var(--ash);
  padding-top: clamp(48px, 5.5vw, 80px);
  font-size: 13.5px;
}

.ft__grid {
  display: grid;
  gap: clamp(26px, 3.4vw, 52px);
  padding-bottom: clamp(36px, 4.5vw, 60px);
}

@media (min-width: 900px) {
  .ft__grid {
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  }
}

.ft h4 {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bone);
  font-weight: 500;
  margin-bottom: 16px;
}

.ft a:hover {
  color: var(--bone);
}

.ft ul li + li {
  margin-top: 9px;
}

.ft__about {
  margin-top: 18px;
  line-height: 1.8;
  max-width: 34ch;
  color: var(--ash);
}

.ft__c li {
  display: flex;
  gap: 10px;
  line-height: 1.7;
}

.ft__c li + li {
  margin-top: 10px;
}

.ft__c b {
  color: var(--bone);
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.ft__bar {
  border-top: 1px solid var(--line-dark-soft);
  padding-block: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #6d737b;
}

/* ---------- 16. Forms ---------- */
.form {
  border: 1px solid var(--line);
  background: var(--white);
  padding: clamp(24px, 3vw, 40px);
}

/* 表单容器：统一行间距，避免逐元素 margin 叠加导致列错位 */
.form form {
  display: grid;
  row-gap: 18px;
}

.f-row {
  display: grid;
  gap: 16px;
  align-items: start;
}

@media (min-width: 620px) {
  .f-row {
    grid-template-columns: 1fr 1fr;
    column-gap: 18px;
  }
}

.f-field {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* 同一行内左右字段顶部对齐 */
.f-field > * {
  margin-top: 0;
}

.f-field > span {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ash);
  margin-bottom: 8px;
}

.f-field input,
.f-field select,
.f-field textarea {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid var(--line);
  background: var(--bone);
  font-size: 14.5px;
  border-radius: 1px;
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}

.f-field input:focus,
.f-field select:focus,
.f-field textarea:focus {
  outline: none;
  border-color: var(--amber-deep);
  background: var(--white);
  box-shadow: 0 0 0 3px var(--amber-dim);
}

.f-field textarea {
  min-height: 120px;
  resize: vertical;
}

.f-note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--ash-dark);
  margin-top: 0;
}

.f-msg {
  display: none;
  margin-top: 16px;
  padding: 12px 15px;
  border: 1px solid #b6d7bd;
  background: #eef7f0;
  color: #21653a;
  font-size: 13.5px;
}

.f-msg.on {
  display: block;
}

/* ---------- 17. Contact cards ---------- */
.ccards {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 700px) {
  .ccards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.ccard {
  background: var(--bone);
  padding: clamp(20px, 2.4vw, 28px);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.ccard h3 {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ash);
  font-weight: 500;
}

.ccard b {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 1.4vw, 1.16rem);
  font-weight: 500;
  letter-spacing: -0.01em;
  word-break: break-word;
}

.ccard p {
  margin-top: auto;
  padding-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ash-dark);
}

/* ---------- 18. Notes / disclaimer ---------- */
.note {
  border-left: 2px solid var(--amber);
  background: rgba(235, 98, 58, 0.07);
  padding: 16px 20px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ash-dark);
}

.note b {
  color: var(--ink-text);
}

/* ---------- 19. Reveal ---------- */
.rv {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}

.rv.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .rv {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 20. Utilities ---------- */
.mt-s {
  margin-top: 12px;
}
.mt {
  margin-top: 24px;
}
.mt-l {
  margin-top: 40px;
}
.mb {
  margin-bottom: 24px;
}
.tc {
  text-align: center;
}

/* ==========================================================================
   21. Product catalog (v2) — 规格书级内容组件
   ========================================================================== */

/* 页内子导航 */
.subnav {
  position: sticky;
  top: 76px;
  z-index: 60;
  background: rgba(245, 242, 236, 0.95);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-block: 1px solid var(--line);
}

.subnav__in {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-block: 12px;
  scrollbar-width: none;
}

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

.subnav a {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 7px 13px;
  border: 1px solid var(--line);
  color: var(--ash-dark);
  white-space: nowrap;
  border-radius: 1px;
  transition: all 0.22s var(--ease);
}

.subnav a:hover {
  border-color: var(--amber-deep);
  color: var(--ink-text);
  background: var(--white);
}

/* 型号详情卡 */
.pdetail {
  background: var(--bone);
  border: 1px solid var(--line);
  border-radius: 1px;
  overflow: hidden;
}

.pdetail + .pdetail {
  margin-top: -1px;
}

.pdetail__top {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  align-items: baseline;
  padding: clamp(18px, 2.2vw, 26px) clamp(18px, 2.2vw, 26px) 0;
}

.pdetail__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber-deep);
  font-weight: 500;
  padding: 3px 8px;
  border: 1px solid currentColor;
  border-radius: 1px;
}

.pdetail__name {
  font-size: clamp(1.1rem, 1.6vw, 1.32rem);
  font-weight: 700;
  letter-spacing: -0.015em;
}

.pdetail__sys {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ash);
  margin-left: auto;
}

/* 规格表 */
.spec {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  margin-top: 18px;
}

.spec > div {
  background: var(--bone);
  padding: 15px 20px 17px;
}

.spec > div:only-child {
  grid-column: 1 / -1;
}

.spec dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ash);
}

.spec dd {
  margin: 7px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
}

.spec dd b {
  font-weight: 600;
}

/* 参考值标记 */
.ref {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  color: var(--ash);
  border: 1px dashed rgba(10, 10, 11, 0.22);
  padding: 1px 5px;
  margin-left: 6px;
  vertical-align: 1px;
  border-radius: 1px;
}

/* 紧凑矩阵表 */
.std--dense th,
.std--dense td {
  padding: 11px 14px;
  font-size: 12.5px;
}

.std--dense td code {
  font-size: 11.5px;
}

/* FAQ */
.faq {
  border-top: 1px solid var(--line);
}

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

.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 20px 0;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  transition: color 0.2s;
}

.faq summary:hover {
  color: var(--amber-deep);
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--amber-deep);
  line-height: 1;
  flex-shrink: 0;
}

.faq details[open] summary::after {
  content: "−";
}

.faq p {
  padding: 0 0 20px;
  font-size: 14px;
  line-height: 1.82;
  color: var(--ash-dark);
  max-width: 86ch;
}

.faq p + p {
  padding-top: 0;
  margin-top: -8px;
}

/* 型号组标题条 */
.grp {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  padding: 0 0 14px;
  margin-bottom: 0;
  border-bottom: 2px solid var(--ink-text);
}

.grp__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber-deep);
}

.grp__t {
  font-size: clamp(1.25rem, 2vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.grp__c {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ash);
  margin-left: auto;
}

@media (max-width: 700px) {
  .subnav {
    top: 76px;
  }
  .pdetail__sys {
    margin-left: 0;
    width: 100%;
  }
}

/* 锚点定位补偿（fixed header + sticky subnav） */
section[id] {
  scroll-margin-top: 148px;
}

@media (max-width: 700px) {
  section[id] {
    scroll-margin-top: 140px;
  }
}

/* 产品图版（规格页视觉锚点） */
.pband {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  margin-top: clamp(20px, 3vw, 34px);
  aspect-ratio: 21 / 8;
}

.pband img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.02);
}

.pband figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 12px 18px;
  background: rgba(10, 10, 11, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone);
}

@media (max-width: 640px) {
  .pband {
    aspect-ratio: 16 / 9;
  }
}

/* ==========================================================================
   22. Alsico-informed content blocks（行业优先 / 商业模式 / 案例 / 服务 / 防护类型）
   ========================================================================== */

/* 三大主张条 */
.pillars {
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

@media (min-width: 860px) {
  .pillars {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pillar {
  background: var(--black);
  padding: clamp(26px, 3vw, 40px);
  transition: background 0.35s var(--ease);
}

.pillar:hover {
  background: var(--smoke);
}

.pillar__k {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.pillar h3 {
  margin-top: 14px;
  font-size: clamp(1.05rem, 1.5vw, 1.28rem);
  font-weight: 700;
  color: var(--bone);
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.pillar p {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.78;
  color: #98a0aa;
}

/* 行业卡片（带一句价值主张） */
.indgrid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 700px) {
  .indgrid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .indgrid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.indcard {
  background: var(--bone);
  padding: clamp(22px, 2.6vw, 32px);
  display: flex;
  flex-direction: column;
  transition: background 0.3s var(--ease);
  position: relative;
}

.indcard:hover {
  background: var(--white);
}

.indcard__k {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--amber-deep);
}

.indcard h3 {
  margin-top: 12px;
  font-size: clamp(1.08rem, 1.5vw, 1.26rem);
  font-weight: 700;
  letter-spacing: -0.015em;
}

.indcard p {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ash-dark);
}

.indcard__std {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 16px;
}

.indcard__more {
  margin-top: auto;
  padding-top: 16px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-deep);
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.indcard:hover .indcard__more {
  gap: 12px;
}

/* 商业模式区块 */
.model {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

@media (min-width: 920px) {
  .model {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }
}

.model__rows {
  border-top: 1px solid var(--line-dark);
}

.section--dark .model__rows,
.section--coal .model__rows {
  border-top-color: var(--line-dark);
}

.model__row {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-dark-soft);
}

@media (min-width: 620px) {
  .model__row {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
    gap: 24px;
  }
}

.model__row b {
  font-size: 14px;
  font-weight: 600;
  color: var(--bone);
}

.model__row span {
  font-size: 13.5px;
  line-height: 1.72;
  color: #98a0aa;
}

/* 引述块 */
.pull {
  border-left: 2px solid var(--amber);
  padding: 4px 0 4px 24px;
  max-width: 62ch;
}

.pull p {
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.7;
  color: var(--bone);
  font-weight: 500;
}

.pull cite {
  display: block;
  margin-top: 14px;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ash);
}

/* 案例块 */
.caseblk {
  border: 1px solid var(--line);
  background: var(--white);
  display: grid;
  gap: 0;
}

@media (min-width: 900px) {
  .caseblk {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

.caseblk__body {
  padding: clamp(24px, 3vw, 40px);
}

.caseblk__k {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--amber-deep);
}

.caseblk h3 {
  margin-top: 14px;
  font-size: clamp(1.2rem, 1.9vw, 1.55rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.caseblk p {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ash-dark);
}

.caseblk__side {
  background: var(--black);
  color: var(--bone);
  padding: clamp(24px, 3vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 18px;
  justify-content: center;
}

.caseblk__side dl {
  margin: 0;
}

.caseblk__side dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ash);
}

.caseblk__side dd {
  margin: 6px 0 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--bone);
}

.caseblk__side dd:last-child {
  margin-bottom: 0;
}

/* 服务网格 */
.svcgrid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 640px) {
  .svcgrid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1020px) {
  .svcgrid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.svc {
  background: var(--bone);
  padding: clamp(20px, 2.4vw, 30px);
}

.svc__n {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--amber-deep);
}

.svc h3 {
  margin-top: 12px;
  font-size: 1.04rem;
  font-weight: 700;
}

.svc p {
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--ash-dark);
}

/* 防护类型卡片 */
.ptype {
  border: 1px solid var(--line-dark);
  background: var(--black);
  padding: clamp(24px, 2.8vw, 36px);
  display: block;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.ptype:hover {
  background: var(--smoke);
  border-color: rgba(255, 255, 255, 0.28);
}

.ptype__k {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.ptype h3 {
  margin-top: 13px;
  font-size: clamp(1.1rem, 1.6vw, 1.32rem);
  font-weight: 700;
  color: var(--bone);
  letter-spacing: -0.015em;
}

.ptype p {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.75;
  color: #98a0aa;
}

.ptype__std {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 16px;
}

.ptype__std span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 7px;
  border: 1px solid var(--line-dark);
  color: #98a0aa;
}

/* 标准代码解读 */
.codex {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 700px) {
  .codex {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .codex {
    grid-template-columns: repeat(3, 1fr);
  }
}

.codex > div {
  background: var(--bone);
  padding: 20px 22px;
}

.codex dt {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--amber-deep);
  letter-spacing: 0.06em;
}

.codex dd {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ash-dark);
}

.codex dd b {
  color: var(--ink-text);
  font-weight: 600;
}

/* 行业深页头部 */
.deephd {
  border-top: 2px solid var(--ink-text);
  padding-top: 18px;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.deephd__k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--amber-deep);
}

.deephd h2 {
  margin-top: 10px;
  font-size: clamp(1.45rem, 2.6vw, 2.05rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.deephd .lead {
  margin-top: 14px;
}

/* ==========================================================================
   23. 通用工具类（补齐）
   ========================================================================== */

.muted {
  color: var(--ash-dark);
}

.section--dark .muted,
.section--coal .muted {
  color: #a7adb5;
}

.grid {
  display: grid;
  gap: 1px;
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}

/* 键值行组 */
.plist {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 760px) {
  .plist {
    grid-template-columns: repeat(2, 1fr);
  }
}

.plist__row {
  background: var(--bone);
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px 16px;
  flex-wrap: wrap;
}

.plist__row b {
  font-size: 14.5px;
  font-weight: 600;
  flex: 0 1 auto;
}

.plist__row span {
  font-size: 12.5px;
  color: var(--ash-dark);
  text-align: right;
  flex: 1 1 auto;
}

.section--dark .plist,
.section--coal .plist,
.section--bone2 .plist {
  border-color: var(--line);
}

.section--dark .plist {
  background: var(--line-dark);
  border-color: var(--line-dark);
}

.section--dark .plist__row,
.section--coal .plist__row {
  background: var(--coal);
}

.section--dark .plist__row span,
.section--coal .plist__row span {
  color: var(--ash);
}

.section--dark .plist__row b,
.section--coal .plist__row b {
  color: var(--bone);
}

/* 深色信息卡 */
.dcard {
  padding: clamp(22px, 2.4vw, 30px);
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.03);
  height: 100%;
  transition: background 0.3s var(--ease);
}

.dcard:hover {
  background: rgba(255, 255, 255, 0.06);
}

.dcard__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.1vw, 1.8rem);
  font-weight: 500;
  color: var(--amber);
  line-height: 1;
}

.dcard h3 {
  margin-top: 14px;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--bone);
}

.dcard p {
  margin-top: 9px;
  font-size: 13.5px;
  line-height: 1.75;
  color: #98a0aa;
}

/* ==========================================================================
   24. English locale adjustments
   ========================================================================== */
body[data-lang="en"] .logo__cn {
  letter-spacing: 0.16em;
  font-size: 15px;
}

body[data-lang="en"] .logo__en {
  letter-spacing: 0.26em;
  font-size: 8px;
}

body[data-lang="en"] .nav a {
  font-size: 14.5px;
  padding: 10px 11px;
  font-weight: 600;
  letter-spacing: 0.005em;
}

body[data-lang="en"] .hero h1 {
  font-size: clamp(2.4rem, 6vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
}

body[data-lang="en"] .h2 {
  letter-spacing: -0.025em;
  line-height: 1.08;
}

body[data-lang="en"] .lead {
  line-height: 1.7;
}

body[data-lang="en"] .pitem dd,
body[data-lang="en"] .spec dd {
  line-height: 1.55;
}

body[data-lang="en"] .pillar h3,
body[data-lang="en"] .indcard h3,
body[data-lang="en"] .ptype h3 {
  line-height: 1.32;
}

body[data-lang="en"] .pcard__title {
  letter-spacing: -0.01em;
}

/* ==========================================================================
   25. Brand logo (image lockup)
   ========================================================================== */
.logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.logo__img {
  display: block;
  height: 26px;
  width: auto;
}

@media (max-width: 1280px) {
  .logo__img {
    height: 23px;
  }
}

@media (max-width: 560px) {
  .logo__img {
    height: 21px;
  }
}

/* 旧占位标记与文字（保留定义，便于回退） */
.logo__mark,
.logo__txt,
.logo__cn,
.logo__en {
  display: none;
}

/* 品牌名对读屏可见 */
.logo__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 多行联系信息（地址）与单行值统一起始位置 */
.ccard .ccard__multi {
  line-height: 1.5;
}

/* ==========================================================================
   26. 留资页布局（左表单 / 右资料，两列卡片对齐）
   ========================================================================== */
.lead-split {
  display: grid;
  gap: clamp(20px, 2.6vw, 28px);
  align-items: stretch;
}

@media (min-width: 920px) {
  .lead-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
}

.form--panel {
  height: 100%;
}

.form--panel .pgrid {
  border-color: var(--line) !important;
}

/* 留资页：两列首行标题基线对齐 */
.lead-split > .form > .kicker,
.lead-split > .form > .h3,
.lead-split > .form > .h2 {
  margin-top: 0;
}

/* ==========================================================================
   27. 语言切换 · 移动端可见性
   ========================================================================== */
.lang a {
  opacity: 0.8;
  transition: opacity 0.2s, color 0.2s;
}

.lang a:hover {
  opacity: 1;
  color: var(--bone);
}

@media (max-width: 1240px) {
  /* 移动/平板：语言切换常驻页头，并放大触控区域 */
  .lang {
    font-size: 12px;
    letter-spacing: 0.08em;
    gap: 7px;
  }

  .lang a,
  .lang .on {
    padding: 8px 3px;
    display: inline-block;
    line-height: 1;
  }
}

@media (max-width: 560px) {
  .hd {
    gap: 16px;
  }

  .hd__side {
    gap: 10px;
  }
}

@media (max-width: 420px) {
  .logo__img {
    height: 18px;
  }

  .hd {
    gap: 12px;
  }

  .lang {
    font-size: 11.5px;
    gap: 5px;
  }

  .burger {
    width: 38px;
  }
}

/* 超小屏（320–360px）保证 页头：logo + 语言切换 + 菜单 三者不折行 */
@media (max-width: 360px) {
  .logo__img {
    height: 16px;
  }

  .hd {
    gap: 8px;
  }

  .lang {
    font-size: 11px;
    gap: 4px;
  }

  .lang a,
  .lang .on {
    padding: 7px 1px;
  }
}

/* 留资表单：错误提示态 */
.f-msg.is-err {
  border-color: #e0b4ac;
  background: #fdf0ed;
  color: #a33521;
}