:root {
  --ink: #151412;
  --charcoal: #24211e;
  --paper: #f7f3ec;
  --bone: #fffaf1;
  --ash: #d5d0c6;
  --ember: #b8552f;
  --moss: #52604b;
  --steel: #7c8a92;
  --line: rgba(21, 20, 18, 0.14);
  --shadow: 0 24px 70px rgba(21, 20, 18, 0.22);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
}

a {
  color: inherit;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 72px;
  padding: 16px clamp(18px, 5vw, 56px);
  color: var(--bone);
  background: linear-gradient(180deg, rgba(16, 15, 14, 0.72), rgba(16, 15, 14, 0));
}

.brand,
.nav-links,
.hero-actions,
.site-footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 24px;
  height: 24px;
  border: 2px solid var(--bone);
  border-radius: 50%;
  background:
    linear-gradient(135deg, transparent 45%, rgba(255, 255, 255, 0.8) 46% 54%, transparent 55%),
    var(--charcoal);
  box-shadow: inset 0 0 0 5px rgba(255, 255, 255, 0.16);
}

.nav-links {
  gap: clamp(12px, 3vw, 28px);
  font-size: 0.92rem;
}

.nav-links a,
.header-cta {
  text-decoration: none;
}

.nav-links a {
  opacity: 0.86;
}

.nav-links a:hover,
.header-cta:hover {
  opacity: 1;
}

.header-cta {
  padding: 10px 16px;
  border: 1px solid rgba(255, 250, 241, 0.42);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  background: rgba(255, 250, 241, 0.1);
  backdrop-filter: blur(10px);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--bone);
}

.hero-media,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media {
  background-image: url("https://commons.wikimedia.org/wiki/Special:Redirect/file/Japanese%20Binch%C5%8Dtan%20(Japanese%20high-grade%20charcoal%20produced%20from%20ubame%20oak).jpg?width=1800");
  background-position: center;
  background-size: cover;
  transform: scale(1.02);
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(10, 10, 9, 0.92), rgba(10, 10, 9, 0.58) 45%, rgba(10, 10, 9, 0.08)),
    linear-gradient(0deg, rgba(10, 10, 9, 0.68), rgba(10, 10, 9, 0.12) 42%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(760px, calc(100% - 36px));
  margin: 0 auto;
  padding: 128px 0 15vh;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--ember);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #ffb287;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 920px;
  margin-bottom: 22px;
  font-size: 6.2rem;
  line-height: 0.92;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 20px;
  font-size: 4rem;
  line-height: 0.96;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.05rem;
}

p {
  line-height: 1.68;
}

.hero-copy {
  max-width: 580px;
  color: rgba(255, 250, 241, 0.86);
  font-size: 1.26rem;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.button-primary {
  color: var(--bone);
  background: var(--ember);
}

.button-primary:hover {
  background: #9f4326;
}

.button-secondary {
  color: var(--bone);
  border-color: rgba(255, 250, 241, 0.42);
  background: rgba(255, 250, 241, 0.1);
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
  background: var(--bone);
}

.trust-strip div {
  min-height: 126px;
  padding: 28px clamp(18px, 4vw, 40px);
  border-right: 1px solid var(--line);
}

.trust-strip div:last-child {
  border-right: 0;
}

.trust-strip strong,
.trust-strip span {
  display: block;
}

.trust-strip strong {
  margin-bottom: 8px;
  font-size: 1.75rem;
}

.trust-strip span {
  color: rgba(21, 20, 18, 0.66);
}

.section {
  padding: clamp(72px, 10vw, 132px) clamp(18px, 5vw, 56px);
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: start;
}

.quality-section p,
.use-copy > p,
.contact-section p {
  max-width: 660px;
  color: rgba(21, 20, 18, 0.68);
  font-size: 1.05rem;
}

.spec-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.spec-panel div {
  min-height: 132px;
  padding: 24px;
  background: var(--bone);
}

.spec-panel span,
.spec-panel strong {
  display: block;
}

.spec-panel span {
  margin-bottom: 14px;
  color: rgba(21, 20, 18, 0.56);
  font-size: 0.88rem;
}

.spec-panel strong {
  font-size: 2rem;
  line-height: 1.05;
}

.uses-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1fr);
  gap: clamp(28px, 6vw, 74px);
  align-items: stretch;
  background: #ebe4d8;
}

.feature-image {
  min-height: 520px;
  border-radius: 8px;
  background-image:
    linear-gradient(0deg, rgba(17, 16, 15, 0.12), rgba(17, 16, 15, 0.12)),
    url("https://commons.wikimedia.org/wiki/Special:Redirect/file/Cooling%20the%20burning%20white%20charcoal%20binchotan%20by%20sand%20at%20Vietnam%20Binchotan%20Joint%20Stock%20Company.JPG?width=1200");
  background-position: center;
  background-size: cover;
  box-shadow: var(--shadow);
}

.use-copy {
  align-self: center;
}

.use-list {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.use-list article {
  padding: 22px 0;
  border-top: 1px solid rgba(21, 20, 18, 0.16);
}

.use-list p,
.process-grid p {
  margin-bottom: 0;
  color: rgba(21, 20, 18, 0.64);
}

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

.sourcing-section .section-kicker {
  color: #ffb287;
}

.sourcing-section h2 {
  max-width: 920px;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: clamp(28px, 5vw, 58px);
  overflow: hidden;
  border: 1px solid rgba(255, 250, 241, 0.16);
  border-radius: 8px;
}

.process-grid article {
  min-height: 260px;
  padding: 28px;
  background: rgba(255, 250, 241, 0.06);
}

.process-grid span {
  display: inline-flex;
  margin-bottom: 58px;
  color: #ffb287;
  font-weight: 900;
}

.process-grid p {
  color: rgba(255, 250, 241, 0.7);
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 0.62fr);
  gap: clamp(30px, 6vw, 80px);
  padding: clamp(72px, 10vw, 132px) clamp(18px, 5vw, 56px);
  background: var(--bone);
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
  box-shadow: 0 20px 52px rgba(21, 20, 18, 0.12);
}

label {
  display: grid;
  gap: 8px;
  font-size: 0.86rem;
  font-weight: 800;
}

input,
textarea {
  width: 100%;
  border: 1px solid rgba(21, 20, 18, 0.18);
  border-radius: 6px;
  padding: 13px 14px;
  color: var(--ink);
  background: var(--bone);
  font: inherit;
}

textarea {
  resize: vertical;
}

.contact-form .button {
  width: 100%;
  margin-top: 4px;
}

.site-footer {
  justify-content: space-between;
  gap: 20px;
  padding: 24px clamp(18px, 5vw, 56px);
  color: rgba(255, 250, 241, 0.68);
  background: #151412;
  font-size: 0.88rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--bone);
}

@media (max-width: 900px) {
  .site-header {
    position: absolute;
  }

  .nav-links {
    display: none;
  }

  .hero {
    min-height: 88vh;
  }

  .hero-content {
    padding-bottom: 96px;
  }

  h1 {
    font-size: 4.8rem;
  }

  h2 {
    font-size: 3.1rem;
  }

  .hero-copy {
    font-size: 1.12rem;
  }

  .trust-strip,
  .section-grid,
  .uses-section,
  .process-grid,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .trust-strip div {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .feature-image {
    min-height: 380px;
  }

  .process-grid article {
    min-height: 210px;
  }

  .process-grid span {
    margin-bottom: 34px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .site-header {
    min-height: 62px;
  }

  .header-cta {
    display: none;
  }

  h1 {
    font-size: 3.25rem;
    line-height: 0.96;
  }

  h2 {
    font-size: 2.35rem;
  }

  .trust-strip strong,
  .spec-panel strong {
    font-size: 1.55rem;
  }

  .hero-copy {
    font-size: 1.05rem;
  }

  .hero-overlay {
    background:
      linear-gradient(0deg, rgba(10, 10, 9, 0.82), rgba(10, 10, 9, 0.18) 56%),
      linear-gradient(90deg, rgba(10, 10, 9, 0.8), rgba(10, 10, 9, 0.18));
  }

  .hero-actions,
  .hero-actions .button {
    width: 100%;
  }

  .spec-panel {
    grid-template-columns: 1fr;
  }
}