:root {
  --red: #bc3028;
  --red-dark: #852019;
  --green: #164d3d;
  --black: #171915;
  --gray: #6d7069;
  --cream: #f3efe6;
  --line: #ddd7ca;
  --white: #fff;
  --max: 1220px;
  --shadow: 0 18px 55px rgba(25, 29, 24, .12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--black);
  background: #fff;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
}

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

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

button,
input,
select {
  font: inherit;
}

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

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(0, 0, 0, .08);
  background: rgba(255, 255, 255, .95);
  backdrop-filter: blur(12px);
}

.header-inner {
  width: min(1320px, calc(100% - 48px));
  min-height: 78px;
  margin: auto;
  display: flex;
  align-items: center;
  gap: 36px;
}

.brand,
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--red);
  font-size: 27px;
  font-weight: 900;
}

.brand strong,
.footer-brand strong {
  display: block;
  font-size: 19px;
  line-height: 1.2;
}

.brand small,
.footer-brand small {
  display: block;
  color: #888;
  font-size: 9px;
  letter-spacing: 1.4px;
}

.nav {
  margin-left: auto;
  display: flex;
  gap: 30px;
}

.nav a {
  position: relative;
  padding: 26px 0;
  font-size: 14px;
  font-weight: 700;
}

.nav a::after {
  position: absolute;
  content: "";
  right: 0;
  bottom: 20px;
  left: 0;
  height: 2px;
  background: var(--red);
  transform: scaleX(0);
  transition: .25s;
}

.nav a:hover::after {
  transform: scaleX(1);
}

.header-cta,
.button.primary {
  color: #fff;
  background: var(--red);
}

.header-cta {
  padding: 12px 21px;
  font-weight: 800;
}

.menu-button {
  display: none;
  margin-left: auto;
  border: 0;
  background: none;
  font-size: 25px;
}

.hero {
  position: relative;
  min-height: 720px;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(10, 12, 10, .95), rgba(10, 12, 10, .5) 58%, rgba(10, 12, 10, .08)),
    url("0134b66441bf3b0939758e1a7cd9f542.jpg") center / cover;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 80px 0 150px;
}

.eyebrow {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid rgba(255, 255, 255, .45);
  font-size: 12px;
  letter-spacing: 1px;
}

.hero h1 {
  max-width: 800px;
  margin: 25px 0 20px;
  font-size: clamp(45px, 6vw, 82px);
  line-height: 1.12;
  letter-spacing: -3px;
}

.hero h1 em {
  color: #e45b51;
  font-style: normal;
}

.hero-lead {
  max-width: 680px;
  color: rgba(255, 255, 255, .78);
  font-size: 18px;
}

.hero-actions {
  margin-top: 35px;
  display: flex;
  gap: 13px;
}

.button {
  padding: 14px 26px;
  border: 1px solid rgba(255, 255, 255, .7);
  font-weight: 800;
  transition: .25s;
}

.button:hover,
.header-cta:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

.hero-stats {
  position: absolute;
  left: 0;
  bottom: 28px;
  display: flex;
}

.hero-stats div {
  min-width: 145px;
  padding: 0 25px;
  border-left: 1px solid rgba(255, 255, 255, .3);
}

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

.hero-stats strong {
  display: block;
  font-size: 31px;
  line-height: 1.2;
}

.hero-stats sup {
  color: #e45b51;
  font-size: 13px;
}

.hero-stats span {
  color: rgba(255, 255, 255, .62);
  font-size: 12px;
}

.price-card {
  position: absolute;
  z-index: 3;
  right: max(35px, calc((100% - 1220px) / 2));
  bottom: 48px;
  width: 320px;
  padding: 28px;
  color: var(--black);
  background: #fff;
  box-shadow: 0 22px 65px rgba(0, 0, 0, .3);
}

.price-card > p {
  margin-top: 0;
  font-weight: 800;
}

.price-row {
  padding: 12px 0;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid #eee;
}

.price-row b {
  color: var(--red);
  font-size: 21px;
}

.price-card small {
  display: block;
  color: #999;
  font-size: 10px;
}

.price-card a {
  display: block;
  margin-top: 17px;
  color: var(--red);
  font-weight: 800;
}

.trust-strip {
  color: #fff;
  background: var(--red);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.trust-grid div {
  padding: 22px 25px;
  border-left: 1px solid rgba(255, 255, 255, .2);
}

.trust-grid b,
.trust-grid span {
  display: block;
}

.trust-grid span {
  color: rgba(255, 255, 255, .7);
  font-size: 12px;
}

.section {
  padding: 105px 0;
}

.section-kicker {
  color: var(--red);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 2px;
}

h2 {
  margin: 11px 0 0;
  font-size: clamp(35px, 4vw, 53px);
  line-height: 1.23;
  letter-spacing: -2px;
}

.split,
.section-heading {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  align-items: end;
}

.intro-copy,
.section-heading > p,
.credential-grid p {
  color: var(--gray);
}

.dark-section {
  color: #fff;
  background: #161914;
}

.light,
.light-title {
  color: #fff;
}

.light-copy {
  color: rgba(255, 255, 255, .6) !important;
}

.advantage-grid {
  margin-top: 55px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgba(255, 255, 255, .15);
  border-left: 1px solid rgba(255, 255, 255, .15);
}

.advantage-grid article {
  min-height: 235px;
  padding: 28px;
  border-right: 1px solid rgba(255, 255, 255, .15);
  border-bottom: 1px solid rgba(255, 255, 255, .15);
  transition: .3s;
}

.advantage-grid article:hover {
  background: rgba(255, 255, 255, .05);
}

.advantage-grid article:last-child {
  grid-column: span 2;
}

.advantage-grid span {
  color: #df5a50;
  font-size: 12px;
  font-weight: 800;
}

.advantage-grid h3 {
  margin: 35px 0 10px;
  font-size: 20px;
}

.advantage-grid p {
  color: rgba(255, 255, 255, .58);
  font-size: 13px;
}

.materials-section,
.credential-section {
  background: var(--cream);
}

.material-tabs {
  margin-top: 50px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid #cdc6b8;
}

.material-tabs button {
  padding: 17px 8px;
  border: 0;
  border-right: 1px solid #cdc6b8;
  color: #555;
  background: transparent;
  cursor: pointer;
}

.material-tabs button.active {
  color: #fff;
  background: var(--red);
  font-weight: 800;
}

.material-panel {
  display: none;
  margin-top: 22px;
  grid-template-columns: 1fr 2fr;
  background: #fff;
  box-shadow: var(--shadow);
}

.material-panel.active {
  display: grid;
}

.material-intro {
  padding: 40px;
  color: #fff;
  background: var(--green);
}

.material-intro h3 {
  margin: 13px 0;
  font-size: 29px;
}

.material-intro p {
  color: rgba(255, 255, 255, .68);
}

.material-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.material-list article {
  padding: 31px;
  border-left: 1px solid #eee;
  border-bottom: 1px solid #eee;
}

.material-list b {
  color: var(--red);
}

.material-list p {
  color: var(--gray);
  font-size: 13px;
}

.gallery {
  margin-top: 50px;
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  grid-auto-rows: 280px;
  gap: 14px;
}

.gallery figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: #ddd;
}

.gallery .wide {
  grid-column: span 2;
}

.gallery .tall {
  grid-row: span 2;
}

.gallery img {
  height: 100%;
  object-fit: cover;
  transition: .5s;
}

.gallery figure:hover img {
  transform: scale(1.04);
}

.gallery figcaption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 35px 20px 17px;
  color: #fff;
  background: linear-gradient(transparent, rgba(0, 0, 0, .8));
}

.gallery figcaption b,
.gallery figcaption span {
  display: block;
}

.gallery figcaption span {
  color: rgba(255, 255, 255, .68);
  font-size: 11px;
}

.credential-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 65px;
  align-items: center;
}

.credential-image {
  padding: 12px;
  background: #fff;
  box-shadow: var(--shadow);
}

.check-list {
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.check-list li::before {
  margin-right: 9px;
  content: "✓";
  color: var(--red);
  font-weight: 900;
}

.warranty-grid {
  margin-top: 50px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.warranty-grid article {
  padding: 28px;
  border: 1px solid var(--line);
  border-right: 0;
}

.warranty-grid article:last-child {
  border-right: 1px solid var(--line);
}

.warranty-grid strong {
  color: var(--red);
  font-size: 31px;
}

.warranty-grid p {
  color: var(--gray);
  font-size: 12px;
}

.process {
  margin-top: 65px;
  padding: 27px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--cream);
}

.process div {
  text-align: center;
}

.process i {
  display: block;
  color: var(--red);
  font-size: 11px;
  font-style: normal;
}

.process span {
  color: #aaa;
}

.contact-section {
  padding: 95px 0;
  color: #fff;
  background: linear-gradient(120deg, #20231e, #0d0f0c);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 75px;
  align-items: center;
}

.contact-section p {
  color: rgba(255, 255, 255, .58);
}

.contact-points {
  margin-top: 30px;
  display: flex;
  gap: 25px;
  font-size: 12px;
}

.contact-points span::before {
  content: "✓ ";
  color: #e45b51;
}

form {
  padding: 30px;
  color: var(--black);
  background: #fff;
  box-shadow: var(--shadow);
}

label {
  display: block;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 800;
}

input,
select {
  width: 100%;
  margin-top: 6px;
  padding: 12px;
  border: 1px solid #ddd;
  outline: none;
  background: #fafafa;
}

input:focus,
select:focus {
  border-color: var(--red);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

form button {
  width: 100%;
  padding: 14px;
  border: 0;
  color: #fff;
  background: var(--red);
  font-weight: 900;
  cursor: pointer;
}

form small {
  display: block;
  margin-top: 9px;
  color: #999;
  text-align: center;
  font-size: 9px;
}

footer {
  color: #ccc;
  background: #090a08;
}

.footer-grid {
  padding: 50px 0;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 45px;
}

.footer-grid b {
  color: #fff;
}

.footer-grid p {
  color: #777;
  font-size: 12px;
}

.copyright {
  padding: 16px;
  border-top: 1px solid #222;
  color: #555;
  text-align: center;
  font-size: 10px;
}

.mobile-bar {
  display: none;
}

.toast {
  position: fixed;
  z-index: 100;
  left: 50%;
  bottom: 28px;
  padding: 12px 18px;
  color: #fff;
  background: #111;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 18px);
  transition: .25s;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (max-width: 960px) {
  .nav,
  .header-cta {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .nav.open {
    position: absolute;
    top: 78px;
    left: 0;
    width: 100%;
    padding: 14px;
    display: grid;
    background: #fff;
    box-shadow: var(--shadow);
  }

  .nav.open a {
    padding: 12px;
    color: var(--black);
    border-bottom: 1px solid #eee;
  }

  .price-card {
    display: none;
  }

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

  .advantage-grid article:last-child {
    grid-column: span 2;
  }

  .contact-grid {
    gap: 35px;
  }
}

@media (max-width: 700px) {
  body {
    padding-bottom: 61px;
  }

  .container,
  .header-inner {
    width: min(100% - 28px, var(--max));
  }

  .header-inner {
    min-height: 67px;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
  }

  .hero {
    min-height: 720px;
    align-items: flex-start;
  }

  .hero-content {
    padding-top: 80px;
  }

  .hero h1 {
    font-size: 44px;
    letter-spacing: -2px;
  }

  .hero-lead {
    font-size: 15px;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    text-align: center;
  }

  .hero-stats {
    right: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .hero-stats div,
  .hero-stats div:first-child {
    min-width: 0;
    padding: 9px 14px;
    border-left: 1px solid rgba(255, 255, 255, .25);
  }

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

  .trust-grid div {
    padding: 16px;
  }

  .section {
    padding: 72px 0;
  }

  .split,
  .section-heading,
  .credential-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 23px;
  }

  h2 {
    font-size: 36px;
  }

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

  .advantage-grid article,
  .advantage-grid article:last-child {
    min-height: auto;
    grid-column: auto;
  }

  .material-tabs {
    grid-template-columns: 1fr 1fr;
  }

  .material-panel,
  .material-panel.active {
    grid-template-columns: 1fr;
  }

  .material-list {
    grid-template-columns: 1fr;
  }

  .gallery {
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: 225px;
  }

  .gallery .wide {
    grid-column: span 2;
  }

  .gallery .tall {
    grid-row: auto;
  }

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

  .warranty-grid article {
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }

  .warranty-grid article:last-child {
    border-bottom: 1px solid var(--line);
  }

  .process {
    overflow-x: auto;
    gap: 25px;
    justify-content: flex-start;
  }

  .process div {
    min-width: 73px;
  }

  .contact-points {
    display: grid;
    gap: 7px;
  }

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

  .mobile-bar {
    position: fixed;
    z-index: 80;
    right: 0;
    bottom: 0;
    left: 0;
    height: 61px;
    display: grid;
    grid-template-columns: 1fr 1fr 1.2fr;
    background: #fff;
    box-shadow: 0 -5px 20px rgba(0, 0, 0, .12);
  }

  .mobile-bar a {
    display: grid;
    place-items: center;
    font-size: 12px;
    font-weight: 900;
  }

  .mobile-bar .hot {
    color: #fff;
    background: var(--red);
  }
}