:root {
  --color-bg: #0d1318;
  --color-surface: #121b22;
  --color-surface-alt: #18222b;
  --color-panel: rgba(255, 255, 255, 0.05);
  --color-card: #f6f8fa;
  --color-card-soft: #e8edf1;
  --color-text: #ebf1f4;
  --color-text-dark: #14202a;
  --color-muted: #a4b2bd;
  --color-line: rgba(255, 255, 255, 0.1);
  --color-line-strong: rgba(255, 255, 255, 0.2);
  --color-accent: #c97a3a;
  --color-accent-strong: #de8a44;
  --color-accent-soft: rgba(201, 122, 58, 0.12);
  --color-success: #5d9f75;
  --shadow-soft: 0 24px 80px rgba(0, 0, 0, 0.25);
  --shadow-card: 0 18px 44px rgba(8, 15, 22, 0.1);
  --radius-xs: 12px;
  --radius-sm: 18px;
  --radius-md: 28px;
  --radius-lg: 40px;
  --container: 1180px;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6rem;
  --font-display: "Segoe UI", "Trebuchet MS", Arial, sans-serif;
  --font-body: "Arial", "Helvetica Neue", Helvetica, sans-serif;
  --transition: 220ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background:
    radial-gradient(circle at top left, rgba(201, 122, 58, 0.12), transparent 28%),
    linear-gradient(180deg, #0c1116 0%, #111920 35%, #0f171d 100%);
  color: var(--color-text);
  line-height: 1.6;
}

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

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

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

.page-shell {
  min-height: 100vh;
  overflow: clip;
}

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(1, 88, 157, 0.9);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 84px;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.28rem;
  width: 52px;
  height: 52px;
  padding: 0;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-line);
  border-radius: 16px;
  color: var(--color-text);
  cursor: pointer;
  transition:
    background-color var(--transition),
    border-color var(--transition),
    transform var(--transition);
}

.menu-toggle:hover,
.menu-toggle:focus-visible {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(201, 122, 58, 0.45);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition:
    transform var(--transition),
    opacity var(--transition);
}

.menu-toggle.is-active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.brand-logo {
  display: block;
  width: auto;
  height: 42px;
  max-width: 190px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  flex-wrap: wrap;
  justify-content: center;
}

.site-nav a {
  font-size: 0.94rem;
  color: #dce4e9;
  transition: color var(--transition);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #f0f4f7;
}

.mobile-menu {
  display: none;
  border-top: 1px solid var(--color-line);
  background: rgba(8, 13, 18, 0.95);
}

.mobile-menu.is-open {
  display: block;
}

.mobile-nav {
  display: grid;
  gap: 0.75rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.mobile-nav a {
  padding: 1rem 1.05rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-line);
  color: var(--color-text);
}

.mobile-nav-cta {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-strong) 100%) !important;
  border-color: transparent !important;
  color: #fff !important;
}

.header-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background-color var(--transition),
    color var(--transition),
    box-shadow var(--transition);
}

.header-cta {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--color-line);
}

.header-cta:hover,
.header-cta:focus-visible,
.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
}

.hero-section,
.problem-section,
.definition-section,
.benefits-section,
.applications-section,
.components-section,
.engineering-section,
.cta-section {
  padding: var(--space-8) 0;
}

.hero-section {
  padding-top: calc(var(--space-8) + 1rem);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: var(--space-6);
  align-items: center;
}

.eyebrow {
  margin: 0 0 var(--space-3);
  color: #d2dce3;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  line-height: 1.08;
}

h1 {
  font-size: clamp(2.8rem, 5vw, 5.15rem);
  max-width: 12ch;
}

h2 {
  font-size: clamp(2rem, 3.2vw, 3.1rem);
  max-width: 18ch;
}

h3 {
  font-size: 1.26rem;
}

p {
  margin: 0;
}

.hero-text,
.problem-content p,
.definition-copy p,
.section-intro,
.engineering-copy p,
.cta-copy p {
  font-size: 1.05rem;
  color: #dce4e9;
}

.hero-copy {
  display: grid;
  gap: var(--space-4);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: var(--space-2);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-strong) 100%);
  box-shadow: 0 18px 34px rgba(201, 122, 58, 0.2);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  box-shadow: 0 24px 38px rgba(201, 122, 58, 0.28);
}

.btn-secondary {
  border-color: var(--color-line-strong);
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.28);
  color: #fff;
  background: transparent;
}

.hero-visual {
  position: relative;
}

.hero-frame {
  position: relative;
}

.hero-frame img {
  width: 100%;
  aspect-ratio: 5 / 4.5;
  border-radius: var(--radius-md);
  object-fit: cover;
  box-shadow: var(--shadow-soft);
}

.section-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-6);
  align-items: start;
}

.narrow {
  margin-bottom: var(--space-5);
}

.problem-section {
  position: relative;
}

.problem-section::before {
  content: "";
  position: absolute;
  inset: 12% auto auto 0;
  width: 34vw;
  height: 34vw;
  background: radial-gradient(circle, rgba(93, 159, 117, 0.12), transparent 70%);
  pointer-events: none;
}

.problem-content {
  display: grid;
  gap: 1.1rem;
  padding: clamp(1.5rem, 4vw, 2.2rem);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--color-line);
}

.problem-highlight {
  padding: 1.25rem 1.35rem;
  border-left: 3px solid var(--color-accent);
  background: rgba(201, 122, 58, 0.08);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.definition-layout {
  display: grid;
  gap: var(--space-5);
}

.flow-card {
  padding: 0;
  border-radius: 0;
  background: transparent;
  border: 0;
}

.flow-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
}

.timeline-step {
  display: grid;
  align-content: start;
  gap: 0.85rem;
  min-height: 100%;
  padding: 1.2rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.timeline-step strong {
  font-size: 1.2rem;
  line-height: 1.2;
}

.timeline-step p {
  color: #dce4e9;
  font-size: 0.97rem;
}

.timeline-label {
  display: inline-flex;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.timeline-icon {
  display: inline-grid;
  place-items: center;
  width: 3.4rem;
  height: 3.4rem;
  border-radius: 1.1rem;
  background: linear-gradient(135deg, rgba(201, 122, 58, 0.18), rgba(93, 159, 117, 0.14));
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.timeline-icon svg {
  width: 1.55rem;
  height: 1.55rem;
  fill: none;
  stroke: #f0f4f7;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.timeline-line {
  align-self: center;
  width: 3rem;
  height: 2px;
  margin-top: 1.7rem;
  background: linear-gradient(90deg, rgba(201, 122, 58, 0.2), rgba(201, 122, 58, 0.58), rgba(255, 255, 255, 0.2));
}

.flow-caption {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.flow-caption span {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.flow-caption span:not(:last-child)::after {
  content: "";
  width: 1.5rem;
  height: 1px;
  background: rgba(255, 255, 255, 0.24);
}

.benefits-section {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 30%),
    linear-gradient(180deg, #eef3f6 0%, #e8edf1 100%);
  color: var(--color-text-dark);
}

.benefits-section .eyebrow,
.benefits-section .section-heading h2,
.benefits-section .benefit-card h3,
.benefits-section .benefit-card p {
  color: var(--color-text-dark);
}

.benefits-section .eyebrow {
  color: #526270;
}

.benefits-grid,
.components-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.2rem;
}

.benefit-card,
.component-card {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(20, 32, 42, 0.08);
  box-shadow: var(--shadow-card);
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
}

.benefit-card:hover,
.benefit-card:focus-within,
.component-card:hover,
.component-card:focus-within {
  transform: translateY(-5px);
  border-color: rgba(201, 122, 58, 0.35);
  box-shadow: 0 24px 46px rgba(8, 15, 22, 0.14);
}

.benefit-card {
  display: grid;
  align-content: start;
  gap: 1rem;
}

.icon-badge {
  display: inline-grid;
  place-items: center;
  width: 3.1rem;
  height: 3.1rem;
  border-radius: 1rem;
  background: linear-gradient(135deg, rgba(201, 122, 58, 0.16), rgba(93, 159, 117, 0.14));
}

.icon-badge svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: none;
  stroke: var(--color-text-dark);
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.applications-layout {
  display: grid;
  gap: var(--space-5);
}

.applications-panel {
  display: grid;
  grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
  gap: 1.2rem;
  align-items: stretch;
}

.tab-list {
  display: grid;
  gap: 0.7rem;
}

.tab-button {
  position: relative;
  width: 100%;
  padding: 1.15rem 1.2rem;
  text-align: left;
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background-color var(--transition);
}

.tab-button:hover,
.tab-button:focus-visible {
  transform: translateX(3px);
  border-color: rgba(201, 122, 58, 0.4);
}

.tab-button.is-active {
  background: linear-gradient(135deg, rgba(201, 122, 58, 0.18), rgba(255, 255, 255, 0.05));
  border-color: rgba(201, 122, 58, 0.48);
}

.tab-panels {
  min-width: 0;
  height: 100%;
}

.tab-panel {
  height: 100%;
}

.application-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.9fr);
  gap: 1.2rem;
  align-items: stretch;
  min-height: 100%;
  padding: 1.15rem;
  border-radius: calc(var(--radius-md) + 0.4rem);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    var(--color-surface-alt);
  border: 1px solid var(--color-line);
}

.application-copy {
  display: grid;
  align-content: start;
  gap: 1rem;
  padding: 1rem;
}

.application-copy h3 {
  font-size: clamp(1.35rem, 2vw, 1.9rem);
}

.application-note {
  padding-top: 1rem;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 0.94rem;
}

.application-visual img,
.engineering-visual img {
  width: 100%;
  height: 100%;
  aspect-ratio: 5 / 4;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.application-visual {
  height: 100%;
}

.components-section {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.01), rgba(255, 255, 255, 0.03));
}

.section-intro,
.section-footnote {
  max-width: 82ch;
}

.section-intro {
  margin-bottom: var(--space-5);
}

.section-footnote {
  margin-top: var(--space-5);
  color: var(--color-muted);
}

.component-card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03)),
    rgba(255, 255, 255, 0.02);
  border-color: var(--color-line);
  box-shadow: none;
}

.component-card h3 {
  margin-bottom: 0.85rem;
}

.engineering-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr);
  gap: var(--space-6);
  align-items: center;
}

.engineering-visual {
  position: relative;
}

.engineering-visual::after {
  content: "";
  position: absolute;
  right: -1.4rem;
  bottom: -1.4rem;
  width: 45%;
  height: 45%;
  border-radius: 2rem;
  background: linear-gradient(135deg, rgba(201, 122, 58, 0.22), rgba(93, 159, 117, 0.16));
  z-index: -1;
}

.engineering-copy {
  display: grid;
  gap: 1rem;
}

.engineering-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 0.9rem;
}

.engineering-steps span {
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-line);
  color: #dfe8ed;
}

.cta-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: center;
  padding: clamp(1.8rem, 4vw, 3rem);
  border-radius: calc(var(--radius-lg) + 0.3rem);
  background:
    radial-gradient(circle at top left, rgba(222, 138, 68, 0.2), transparent 30%),
    linear-gradient(135deg, #16212a 0%, #0f171e 55%, #1d2a22 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-soft);
}

.cta-copy h2 {
  margin-bottom: 1rem;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  justify-content: flex-end;
}

.site-footer {
  padding: 1.5rem 0 2.5rem;
}

.footer-inner {
  padding-top: 1.4rem;
  border-top: 1px solid var(--color-line);
}

.footer-inner p {
  color: var(--color-muted);
  max-width: 74ch;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1080px) {
  .site-nav {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .hero-grid,
  .section-grid,
  .engineering-layout,
  .applications-panel,
  .application-card,
  .cta-panel {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

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

  .cta-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 820px) {
  :root {
    --space-8: 4.5rem;
    --space-6: 2.25rem;
  }

  .header-inner {
    min-height: 76px;
    position: relative;
    justify-content: center;
  }

  .header-cta {
    display: none;
  }

  .brand {
    justify-content: center;
  }

  .brand-logo {
    height: 42px;
    max-width: 190px;
  }

  .flow-card {
    padding: 1.15rem;
  }

  .flow-timeline {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .timeline-line {
    width: 2px;
    height: 2rem;
    margin: 0 auto;
    background: linear-gradient(180deg, rgba(201, 122, 58, 0.2), rgba(201, 122, 58, 0.58), rgba(255, 255, 255, 0.2));
  }

  .hero-copy {
    order: -1;
  }

  .hero-visual {
    order: 0;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 1.25rem), var(--container));
  }

  h1 {
    font-size: clamp(2.35rem, 12vw, 3.6rem);
  }

  h2 {
    font-size: clamp(1.8rem, 8vw, 2.45rem);
  }

  .hero-section,
  .problem-section,
  .definition-section,
  .benefits-section,
  .applications-section,
  .components-section,
  .engineering-section,
  .cta-section {
    padding: 4rem 0;
  }

  .hero-actions,
  .cta-actions {
    display: grid;
  }

  .btn,
  .header-cta {
    width: 100%;
  }

  .benefits-grid,
  .components-grid {
    grid-template-columns: 1fr;
  }

  .hero-frame,
  .application-card,
  .problem-content,
  .cta-panel {
    padding: 1rem;
  }

  .brand-logo {
    height: 38px;
    max-width: 176px;
  }

  .menu-toggle {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: 14px;
  }

  .flow-card,
  .timeline-step {
    padding: 1rem;
  }

  .flow-caption {
    flex-direction: column;
    gap: 0.55rem;
  }

  .flow-caption span:not(:last-child)::after {
    display: none;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}