/* ============================================================
   EMC 仿真实训台 · /sim/ 枢纽页
   主站奶油纸色 + 暗室深墨 + 磷光青 / 发射琥珀
   ============================================================ */

:root {
  --cream: #F5F0E8;
  --cream-2: #EEE7DB;
  --paper: #FBF8F2;
  --ink: #191919;
  --ink-l: #4A4A4A;
  --ink-m: #8A8A8A;
  --line: #E4DED3;
  --line-2: #D6CEC0;
  --terra: #CC785C;
  --terra-d: #B5644A;
  --amber: #E9A25B;
  --teal: #2F8F86;
  --dark: #070C10;
  --dark-2: #0B1318;
  --serif: 'Fraunces', 'Songti SC', 'STSong', Georgia, serif;
  --sans: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --mono: 'Cascadia Mono', 'SFMono-Regular', Consolas, monospace;
  --max: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; }

::selection { background: rgba(233, 162, 91, 0.35); }

a { color: inherit; }

.skip {
  position: fixed;
  left: 12px;
  top: -60px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--cream);
  font-size: 13px;
  text-decoration: none;
}
.skip:focus { top: 12px; }

:focus-visible {
  outline: 2px solid var(--terra);
  outline-offset: 3px;
}

/* ------------------------------ nav ------------------------------ */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 240, 232, 0.9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav-in {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
  height: 68px;
  display: flex;
  align-items: center;
  gap: 34px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  flex: none;
}

.brand img {
  height: 26px;
  width: auto;
  display: block;
  mix-blend-mode: multiply;
}

.brand-div {
  width: 1px;
  height: 18px;
  background: var(--line-2);
}

.brand-lab {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.13em;
  color: #77736C;
  white-space: nowrap;
}

.brand-lab em {
  font-style: normal;
  color: var(--terra);
  margin-left: 4px;
}

.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-links a {
  font-size: 13px;
  color: var(--ink-l);
  text-decoration: none;
  transition: color 0.15s;
}

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

.nav-cta {
  background: var(--ink);
  color: var(--cream) !important;
  padding: 8px 17px;
  border-radius: 3px;
  font-weight: 600;
  font-size: 12.5px !important;
  transition: background 0.15s;
}

.nav-cta:hover { background: var(--terra-d); }

/* ------------------------------ hero ------------------------------ */

.hero {
  position: relative;
  overflow: hidden;
  background: var(--dark);
  color: var(--cream);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 240, 232, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 240, 232, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 84% 76% at 50% 38%, #000 12%, transparent 78%);
  mask-image: radial-gradient(ellipse 84% 76% at 50% 38%, #000 12%, transparent 78%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(560px 420px at 82% 12%, rgba(233, 162, 91, 0.16), transparent 68%),
    radial-gradient(520px 440px at 8% 86%, rgba(88, 231, 216, 0.09), transparent 70%),
    linear-gradient(180deg, transparent 62%, rgba(3, 6, 8, 0.6));
  pointer-events: none;
}

.hero-in {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin: 0 auto;
  padding: 70px 28px 0;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 58px;
  align-items: center;
}

.hero-copy > * {
  animation: riseIn 0.75s both;
}
.hero-copy > :nth-child(2) { animation-delay: 0.06s; }
.hero-copy > :nth-child(3) { animation-delay: 0.12s; }
.hero-copy > :nth-child(4) { animation-delay: 0.18s; }
.hero-copy > :nth-child(5) { animation-delay: 0.24s; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.22em;
  color: #7FD9CF;
  text-transform: uppercase;
}

.eyebrow i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #58E7D8;
  box-shadow: 0 0 10px rgba(88, 231, 216, 0.9);
}

.eyebrow span {
  margin-left: 8px;
  padding-left: 12px;
  border-left: 1px solid rgba(127, 217, 207, 0.3);
  color: rgba(127, 217, 207, 0.55);
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(46px, 5.5vw, 78px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  margin: 20px 0 24px;
  color: #F7F2E9;
}

.hero h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--amber);
  letter-spacing: -0.04em;
}

.lede {
  max-width: 520px;
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(240, 235, 225, 0.62);
}

.cta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 46px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background 0.18s, border-color 0.18s, transform 0.18s, color 0.18s;
}

.btn-primary {
  background: var(--amber);
  color: #1B1206;
  box-shadow: 0 10px 30px rgba(233, 162, 91, 0.18);
}

.btn-primary:hover {
  background: #F2B171;
  transform: translateY(-1px);
}

.btn-primary span { font-size: 16px; line-height: 1; }

.btn-ghost {
  border-color: rgba(245, 240, 232, 0.18);
  color: rgba(245, 240, 232, 0.72);
}

.btn-ghost:hover {
  border-color: rgba(245, 240, 232, 0.4);
  color: var(--cream);
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin: 42px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(245, 240, 232, 0.12);
}

.facts div {
  padding-left: 15px;
  border-left: 1px solid rgba(245, 240, 232, 0.12);
}

.facts div:first-child {
  padding-left: 0;
  border-left: 0;
}

.facts dt {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.14em;
  color: rgba(240, 235, 225, 0.34);
  text-transform: uppercase;
}

.facts dd {
  margin: 5px 0 0;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: rgba(247, 242, 233, 0.86);
  white-space: nowrap;
}

/* ------------------------------ hero visual ------------------------------ */

.hero-visual {
  position: relative;
  padding: 10px 0;
  animation: screenIn 0.9s 0.14s both;
}

.screen {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(150, 200, 205, 0.2);
  border-radius: 5px;
  background: #04090C;
  box-shadow:
    0 50px 110px rgba(0, 0, 0, 0.6),
    0 0 0 7px rgba(245, 240, 232, 0.025);
  transform: perspective(1400px) rotateY(-3deg) rotateX(1deg);
  transform-origin: 60% 50%;
}

.screen-bar {
  height: 31px;
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0 11px;
  border-bottom: 1px solid rgba(245, 240, 232, 0.07);
  background: #071116;
}

.screen-bar i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #274046;
}

.screen-bar span {
  margin-left: 8px;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.16em;
  color: #637B80;
}

.screen-bar b {
  margin-left: auto;
  padding: 2px 5px;
  border: 1px solid rgba(88, 231, 216, 0.3);
  font-family: var(--mono);
  font-size: 7.5px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: #7FE6D9;
}

.screen img {
  display: block;
  width: 100%;
  height: auto;
}

.fc {
  position: absolute;
  padding: 10px 13px;
  border: 1px solid rgba(150, 200, 205, 0.22);
  border-radius: 3px;
  background: rgba(7, 13, 17, 0.92);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(8px);
  font-family: var(--mono);
  line-height: 1.5;
}

.fc span {
  display: block;
  font-size: 7.5px;
  letter-spacing: 0.18em;
  color: rgba(127, 217, 207, 0.6);
}

.fc b {
  display: block;
  margin: 4px 0 2px;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: #F4EFE6;
}

.fc b i {
  font-style: normal;
  color: #FF7C86;
}

.fc em {
  display: block;
  font-style: normal;
  font-size: 8px;
  letter-spacing: 0.08em;
  color: rgba(240, 235, 225, 0.4);
}

.fc-1 {
  top: 15%;
  right: -18px;
  border-color: rgba(255, 95, 109, 0.28);
}

.fc-2 {
  left: -22px;
  bottom: 12%;
}

.fc-2 b i {
  color: rgba(240, 235, 225, 0.35);
}

.hero-foot {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin: 52px auto 0;
  padding: 18px 28px 26px;
  border-top: 1px solid rgba(245, 240, 232, 0.1);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.13em;
  color: rgba(240, 235, 225, 0.32);
}

/* ------------------------------ sections ------------------------------ */

.sec {
  padding: 92px 0;
  scroll-margin-top: 80px;
}

.sec-in {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

.sec-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  align-items: end;
  gap: 40px;
  margin-bottom: 42px;
}

.kicker {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--terra);
  text-transform: uppercase;
}

.sec h2 {
  margin: 14px 0 0;
  font-family: var(--serif);
  font-size: clamp(31px, 3.4vw, 46px);
  font-weight: 350;
  line-height: 1.16;
  letter-spacing: -0.025em;
}

.sec-head p {
  margin: 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--ink-m);
}

/* ------------------------------ feature card ------------------------------ */

.feature {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  min-height: 404px;
  overflow: hidden;
  border: 1px solid #18262C;
  border-radius: 5px;
  background: #0A1116;
  color: var(--cream);
}

.feature-media {
  position: relative;
  overflow: hidden;
  background: #05090C;
}

.feature-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 16% 50%;
  opacity: 0.96;
  transition: transform 0.7s ease, opacity 0.4s;
}

.feature:hover .feature-media img {
  transform: scale(1.015);
  opacity: 1;
}

.feature-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 9px;
  border: 1px solid rgba(88, 231, 216, 0.28);
  background: rgba(5, 10, 14, 0.82);
  backdrop-filter: blur(6px);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.12em;
  color: #8FE7DC;
}

.feature-badge i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #58E7D8;
  box-shadow: 0 0 7px rgba(88, 231, 216, 0.9);
}

.feature-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 38px 36px;
  border-left: 1px solid #18262C;
}

.card-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.16em;
  color: #6F8A8F;
}

.feature h3 {
  margin: 18px 0 12px;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 400;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: #F4EFE6;
}

.feature p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.85;
  color: rgba(230, 238, 238, 0.54);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 18px 0 26px;
  padding: 0;
  list-style: none;
}

.chips li {
  padding: 4px 8px;
  border: 1px solid rgba(120, 180, 185, 0.2);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.06em;
  color: #8FB9BA;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  margin-top: auto;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(255, 180, 92, 0.3);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--amber);
  text-decoration: none;
  transition: border-color 0.18s, color 0.18s;
}

.card-link:hover {
  border-color: var(--amber);
  color: #F2B171;
}

.card-link span { transition: transform 0.18s; }
.card-link:hover span { transform: translateX(3px); }

/* ------------------------------ future cards ------------------------------ */

.future-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin: 34px 0 14px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--ink-m);
  text-transform: uppercase;
}

.future-head a {
  color: var(--terra);
  text-decoration: none;
  letter-spacing: 0.06em;
  text-transform: none;
  font-family: var(--sans);
  font-size: 11.5px;
}

.future-head a:hover { text-decoration: underline; }

.future {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.fcard {
  display: flex;
  flex-direction: column;
  min-height: 238px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  background: var(--paper);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.fcard:hover {
  border-color: var(--line-2);
  transform: translateY(-2px);
  box-shadow: 0 18px 38px rgba(50, 38, 26, 0.06);
}

.fcard-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.fcard-top svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.15;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.72;
}

.fstat {
  padding: 3px 6px;
  border: 1px dashed var(--line-2);
  font-family: var(--mono);
  font-size: 7.5px;
  letter-spacing: 0.12em;
  color: var(--ink-m);
}

.fnum {
  margin-top: 22px;
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.16em;
  color: var(--ink-m);
}

.fcard h3 {
  margin: 6px 0 2px;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 450;
  letter-spacing: -0.01em;
}

.fcard .std {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.08em;
  color: var(--terra);
}

.fcard p {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.8;
  color: var(--ink-m);
}

.fcard .soon {
  margin-top: auto;
  padding-top: 18px;
  font-family: var(--mono);
  font-size: 7.5px;
  letter-spacing: 0.13em;
  color: #B5AC9D;
}

/* ------------------------------ how ------------------------------ */

.how {
  background: var(--cream-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 44px;
  border-top: 1px solid var(--line-2);
}

.step {
  padding: 26px 30px 0 0;
  margin-right: 30px;
  border-right: 1px solid var(--line-2);
}

.step:last-child {
  margin-right: 0;
  padding-right: 0;
  border-right: 0;
}

.step .n {
  font-family: var(--serif);
  font-size: 40px;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--terra);
}

.step h3 {
  margin: 16px 0 8px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.step p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--ink-l);
}

.how-note {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 34px;
  font-size: 11px;
  color: var(--ink-m);
}

.how-mono {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

/* ------------------------------ model ------------------------------ */

.model {
  position: relative;
  overflow: hidden;
  background: var(--dark-2);
  color: var(--cream);
}

.model::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(540px 380px at 88% 0%, rgba(233, 162, 91, 0.1), transparent 70%),
    radial-gradient(460px 380px at 0% 100%, rgba(88, 231, 216, 0.06), transparent 72%);
  pointer-events: none;
}

.model .sec-in { position: relative; z-index: 2; }

.model .kicker { color: #7FD9CF; }

.model h2 { color: #F7F2E9; }

.model-head p { color: rgba(240, 235, 225, 0.46); }

.model-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 54px;
  align-items: start;
  margin-top: 44px;
}

.formula {
  overflow-x: auto;
  padding: 24px 26px;
  border: 1px solid rgba(140, 190, 195, 0.18);
  background: rgba(4, 9, 12, 0.62);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 2.15;
  color: #B9D4D3;
  white-space: pre;
}

.formula b {
  font-weight: 400;
  color: var(--amber);
}

.formula em {
  display: block;
  margin-bottom: 10px;
  font-style: normal;
  font-size: 8px;
  letter-spacing: 0.16em;
  color: #6F8A8F;
}

.formula sub { font-size: 8px; }

.model-copy p {
  margin: 0 0 16px;
  font-size: 13px;
  line-height: 1.95;
  color: rgba(235, 240, 238, 0.55);
}

.model-lists {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
  margin-top: 28px;
}

.model-lists h4 {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: #7FD9CF;
}

.model-lists ul {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 11.5px;
  line-height: 1.95;
  color: rgba(235, 240, 238, 0.58);
}

.model-lists li::before {
  content: '—';
  margin-right: 7px;
  color: rgba(127, 217, 207, 0.4);
}

.disclaim {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid rgba(245, 240, 232, 0.09);
  font-size: 10.5px;
  line-height: 1.85;
  color: rgba(235, 240, 238, 0.34);
}

/* ------------------------------ footer ------------------------------ */

.foot {
  padding: 38px 0 20px;
  background: #05090C;
  color: rgba(245, 240, 232, 0.4);
}

.foot-in {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}

.foot-brand strong {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: rgba(245, 240, 232, 0.78);
}

.foot-brand strong span {
  color: var(--terra);
  margin: 0 3px;
}

.foot-brand p {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.14em;
  color: rgba(245, 240, 232, 0.24);
}

.foot-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.foot-links a {
  font-size: 12px;
  color: rgba(245, 240, 232, 0.36);
  text-decoration: none;
  transition: color 0.15s;
}

.foot-links a:hover { color: var(--terra); }

.foot-b {
  max-width: var(--max);
  margin: 26px auto 0;
  padding: 14px 28px 0;
  border-top: 1px solid rgba(245, 240, 232, 0.06);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  color: rgba(245, 240, 232, 0.22);
}

/* ------------------------------ animation ------------------------------ */

@keyframes riseIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes screenIn {
  from { opacity: 0; transform: translateY(22px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ------------------------------ responsive ------------------------------ */

@media (max-width: 1080px) {
  .hero-in { gap: 38px; }
  .hero h1 { font-size: clamp(42px, 5.4vw, 64px); }
  .fc-1 { right: -8px; }
  .fc-2 { left: -10px; }
  .sec-head { grid-template-columns: minmax(0, 1fr) 320px; gap: 30px; }
}

@media (max-width: 960px) {
  .hero-in {
    grid-template-columns: 1fr;
    gap: 44px;
    padding-top: 56px;
  }
  .hero-visual { max-width: 720px; }
  .screen { transform: none; }
  .hero-foot { margin-top: 42px; }
  .feature { grid-template-columns: 1fr; }
  .feature-media { min-height: 300px; }
  .feature-body { border-left: 0; border-top: 1px solid #18262C; }
  .future { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; }
  .step {
    padding: 24px 0 26px;
    margin-right: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line-2);
  }
  .step:last-child { border-bottom: 0; padding-bottom: 0; }
  .model-grid { grid-template-columns: 1fr; gap: 32px; }
  .formula { font-size: 11px; }
}

@media (max-width: 820px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .sec { padding: 68px 0; }
  .sec-head { grid-template-columns: 1fr; align-items: start; gap: 16px; }
  .sec-head p { max-width: 520px; }
  .how-note { flex-direction: column; gap: 8px; }
  .how-mono { white-space: normal; }
}

@media (max-width: 640px) {
  .nav-in { height: 60px; padding: 0 18px; gap: 12px; }
  .brand { gap: 10px; }
  .brand img { height: 23px; }
  .brand-lab { display: inline; font-size: 8px; letter-spacing: 0.08em; }
  .brand-lab em { display: none; }
  .brand-div { display: none; }
  .nav-cta { padding: 7px 13px; font-size: 12px !important; }

  .hero-in { padding: 44px 18px 0; gap: 36px; }
  .eyebrow { font-size: 8px; letter-spacing: 0.16em; }
  .hero h1 { font-size: clamp(38px, 11.4vw, 52px); margin: 16px 0 18px; }
  .lede { font-size: 13.5px; line-height: 1.85; }
  .cta-row { margin-top: 26px; }
  .btn { height: 44px; padding: 0 19px; font-size: 12.5px; }
  .facts { grid-template-columns: 1fr 1fr; gap: 14px 0; margin-top: 32px; padding-top: 14px; }
  .facts div { padding-left: 12px; }
  .facts div:nth-child(odd) { padding-left: 0; border-left: 0; }
  .facts dd { font-size: 11.5px; }

  .screen-bar { height: 24px; }
  .screen-bar span { font-size: 6.5px; }
  .fc { padding: 7px 9px; }
  .fc b { font-size: 12px; }
  .fc span { font-size: 6px; }
  .fc em { font-size: 6.5px; }
  .fc-1 { top: 8px; right: 6px; }
  .fc-2 { display: none; }
  .hero-foot { margin-top: 32px; padding: 14px 18px 20px; font-size: 7px; flex-direction: column; gap: 6px; }

  .sec { padding: 56px 0; }
  .sec-in { padding: 0 18px; }
  .sec h2 { font-size: 30px; }
  .feature-media { min-height: 220px; }
  .feature-body { padding: 26px 22px 28px; }
  .feature h3 { font-size: 26px; }
  .future { grid-template-columns: 1fr; }
  .future-head { align-items: flex-start; flex-direction: column; gap: 6px; }
  .fcard { min-height: 0; }
  .model-lists { grid-template-columns: 1fr; gap: 18px; }
  .formula { padding: 18px 16px; font-size: 9.5px; line-height: 2; }
  .foot-in { padding: 0 18px; flex-direction: column; gap: 18px; }
  .foot-b { padding: 14px 18px 0; flex-direction: column; gap: 5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.001ms !important;
  }
}

@media (max-width: 360px) {
  .brand-lab { display: none; }
}