:root {
  --accent: #ff8a00;
  --accent-strong: #e66e00;
  --ink: #202529;
  --muted: #667079;
  --line: #dfe4e7;
  --canvas: #f7f8f7;
  --panel: #ffffff;
  --steel: #11171b;
  --steel-soft: #20282e;
  --white: #ffffff;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: Inter, "Segoe UI", Arial, Helvetica, sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
}

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

img,
svg {
  display: block;
}

img {
  max-width: 100%;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-height: 76px;
  padding: 12px clamp(18px, 5vw, 64px);
  background: rgba(247, 248, 247, 0.88);
  border-bottom: 1px solid rgba(32, 37, 41, 0.09);
  backdrop-filter: blur(18px);
}

.brand {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  width: min(420px, 48vw);
}

.brand__symbol {
  width: 68px;
  height: 58px;
  object-fit: contain;
}

.brand__copy {
  display: grid;
  min-width: 0;
  text-transform: uppercase;
}

.brand__name {
  color: #3f4448;
  font-size: clamp(1.8rem, 3vw, 2.35rem);
  font-weight: 900;
  line-height: 0.94;
}

.brand__division {
  justify-self: end;
  color: var(--accent-strong);
  font-size: 0.96rem;
  font-weight: 900;
  line-height: 1.05;
}

.brand__tagline {
  margin-top: 5px;
  padding-top: 5px;
  border-top: 2px solid #6c7174;
  color: #5f666b;
  font-size: 0.5rem;
  font-weight: 900;
  line-height: 1.1;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 34px);
  color: #434b52;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.nav a {
  position: relative;
  padding: 8px 0;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

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

.hero {
  position: relative;
  min-height: clamp(620px, 82svh, 820px);
  padding: 118px clamp(18px, 5vw, 64px) 30px;
  overflow: hidden;
  color: var(--white);
  background: var(--steel);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.16);
}

.hero__image {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(17, 23, 27, 0.94) 0%, rgba(17, 23, 27, 0.82) 36%, rgba(17, 23, 27, 0.38) 68%, rgba(255, 138, 0, 0.2) 100%),
    linear-gradient(0deg, rgba(17, 23, 27, 0.84), rgba(17, 23, 27, 0.06) 58%),
    url("assets/sentinell-hero-clean.webp") right center / cover no-repeat;
}

.hero__shell {
  position: relative;
  z-index: 1;
  display: grid;
  align-content: end;
  gap: clamp(34px, 7vh, 72px);
  width: min(var(--max), 100%);
  min-height: calc(clamp(620px, 82svh, 820px) - 148px);
  margin: 0 auto;
}

.hero__content {
  width: min(780px, 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.02;
}

h1 {
  max-width: 780px;
  font-size: clamp(3.2rem, 7.1vw, 6.4rem);
  font-weight: 850;
  overflow-wrap: normal;
}

h1 span {
  display: block;
  white-space: nowrap;
}

h2 {
  font-size: clamp(2.25rem, 5vw, 5rem);
  font-weight: 840;
}

h3 {
  font-size: clamp(1.2rem, 1.6vw, 1.58rem);
  font-weight: 820;
}

.hero__lead {
  max-width: 660px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(1.05rem, 1.8vw, 1.32rem);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 850;
  cursor: pointer;
}

.button--primary {
  background: var(--accent);
  color: #12171a;
}

.button--primary:hover,
.button--primary:focus-visible {
  background: #ffad2f;
}

.button--secondary {
  border-color: rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.92);
}

.button--secondary:hover,
.button--secondary:focus-visible {
  border-color: rgba(255, 255, 255, 0.78);
  background: rgba(255, 255, 255, 0.08);
}

.button--dark {
  background: var(--steel);
  color: var(--white);
}

.button--dark:hover,
.button--dark:focus-visible {
  background: var(--steel-soft);
}

.button--light {
  border-color: var(--line);
  background: var(--panel);
  color: var(--ink);
}

.button--light:hover,
.button--light:focus-visible {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.hero__facts div {
  display: grid;
  gap: 6px;
  padding: 18px 24px 16px 0;
  border-right: 1px solid rgba(255, 255, 255, 0.13);
}

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

.hero__facts dt {
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
}

.hero__facts dd {
  margin: 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 0.98rem;
  font-weight: 720;
}

.section {
  padding: clamp(74px, 9vw, 126px) clamp(18px, 5vw, 64px);
}

.section--intro,
.expert-section {
  background: var(--canvas);
}

.section__header,
.band-layout,
.expert,
.contact {
  width: min(var(--max), 100%);
  margin: 0 auto;
}

.section__header {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(280px, 0.72fr);
  gap: clamp(30px, 7vw, 90px);
  align-items: end;
  margin-bottom: clamp(38px, 6vw, 70px);
}

.section__header p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
}

.section__header .eyebrow {
  grid-column: 1 / -1;
  margin-bottom: -20px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  width: min(var(--max), 100%);
  margin: 0 auto;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.service-item {
  min-height: 280px;
  padding: clamp(22px, 3vw, 32px);
  background: rgba(255, 255, 255, 0.42);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.service-item span {
  display: inline-flex;
  margin-bottom: 34px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 900;
}

.service-item p {
  margin: 16px 0 0;
  color: var(--muted);
}

.section--band {
  background: var(--steel);
  color: var(--white);
}

.band-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1fr);
  gap: clamp(34px, 7vw, 92px);
  align-items: start;
}

.band-layout .section__header {
  display: block;
  width: auto;
  margin: 0;
}

.band-layout .section__header h2 {
  max-width: 660px;
}

.measurement-list {
  display: grid;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.measurement-list p {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 18px;
  margin: 0;
  padding: 22px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(1.05rem, 1.7vw, 1.32rem);
}

.measurement-list p::before {
  content: "";
  width: 9px;
  height: 9px;
  margin-top: 0.48em;
  background: var(--accent);
}

.platform-section {
  background:
    linear-gradient(180deg, rgba(255, 138, 0, 0.05), rgba(255, 255, 255, 0)),
    var(--canvas);
}

.platform {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(420px, 1.18fr);
  gap: clamp(34px, 6vw, 84px);
  align-items: center;
  width: min(var(--max), 100%);
  margin: 0 auto;
}

.platform__content {
  max-width: 580px;
}

.platform__content h2 {
  max-width: 620px;
  font-size: clamp(2.35rem, 4vw, 4.2rem);
  line-height: 1.04;
  overflow-wrap: normal;
  word-break: normal;
}

.platform__content p:not(.eyebrow) {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: clamp(1.04rem, 1.5vw, 1.18rem);
}

.platform__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.video-player,
.video-card {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  aspect-ratio: 16 / 9;
}

.video-player {
  min-width: 0;
  border: 1px solid rgba(32, 37, 41, 0.14);
  background: var(--steel);
}

.video-player iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-card {
  display: grid;
  align-content: end;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 360px;
  border: 0;
  background:
    linear-gradient(135deg, rgba(17, 23, 27, 0.94), rgba(17, 23, 27, 0.72)),
    linear-gradient(35deg, rgba(255, 138, 0, 0.18), rgba(255, 255, 255, 0) 42%),
    var(--steel);
  color: var(--white);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.video-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: 0.25;
}

.video-card__play {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  width: 74px;
  height: 74px;
  border-radius: 50%;
  background: var(--accent);
  color: #101417;
  transform: translate(-50%, -50%);
  transition: transform 180ms ease, background 180ms ease;
}

.video-card__play svg {
  width: 34px;
  height: 34px;
  fill: currentColor;
  transform: translateX(2px);
}

.video-card:hover .video-card__play,
.video-card:focus-visible .video-card__play {
  background: #ffad2f;
  transform: translate(-50%, -50%) scale(1.05);
}

.video-card__content {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 8px;
  padding: clamp(24px, 4vw, 34px);
}

.video-card__label,
.video-card__meta {
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 900;
  text-transform: uppercase;
}

.video-card__title {
  max-width: 560px;
  font-size: clamp(1.35rem, 2.7vw, 2.35rem);
  font-weight: 850;
  line-height: 1.05;
}

.video-card__meta {
  color: rgba(255, 255, 255, 0.74);
}

.expert {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: clamp(34px, 7vw, 96px);
  align-items: center;
}

.expert__photo {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: 4px;
  background: #e9edf0;
}

.expert__photo::after {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  pointer-events: none;
}

.expert__photo img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center 18%;
}

.expert__content {
  max-width: 760px;
}

.expert__lead {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: clamp(1.16rem, 2vw, 1.55rem);
}

.credentials {
  display: grid;
  gap: 0;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.credentials li {
  padding: 16px 0 16px 28px;
  border-bottom: 1px solid var(--line);
  color: #4f5961;
}

.credentials li::marker {
  color: var(--accent);
}

.credentials li {
  position: relative;
}

.credentials li::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--accent);
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(320px, 1fr);
  gap: clamp(32px, 7vw, 90px);
  padding: clamp(72px, 9vw, 112px) clamp(18px, 5vw, 64px);
}

.contact__content p:not(.eyebrow) {
  max-width: 620px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: clamp(1.04rem, 1.5vw, 1.18rem);
}

.contact__actions {
  display: grid;
  align-content: start;
  border-top: 1px solid var(--line);
}

.contact-link {
  display: grid;
  gap: 4px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: clamp(1.03rem, 1.5vw, 1.18rem);
  font-weight: 820;
}

.contact-link:hover,
.contact-link:focus-visible,
.social-link:hover,
.social-link:focus-visible {
  color: var(--accent-strong);
}

.contact-link__label {
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 900;
  text-transform: uppercase;
}

.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 20px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.58);
  color: var(--ink);
  font-weight: 850;
}

.social-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.footer {
  padding: 24px clamp(18px, 5vw, 64px);
  background: var(--steel);
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.88rem;
}

.footer p {
  width: min(var(--max), 100%);
  margin: 0 auto;
}

@media (max-width: 980px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .brand {
    width: min(430px, 100%);
  }

  .nav {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }

  .hero {
    min-height: auto;
    padding-top: 64px;
  }

  .hero__shell {
    min-height: 680px;
  }

  .section__header,
  .band-layout,
  .platform,
  .expert,
  .contact {
    grid-template-columns: 1fr;
  }

  .section__header .eyebrow {
    margin-bottom: 0;
  }

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

  .expert__photo {
    width: min(360px, 100%);
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 14px 18px 16px;
  }

  .brand {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 10px;
  }

  .brand__symbol {
    width: 60px;
    height: 52px;
  }

  .brand__name {
    font-size: clamp(1.55rem, 8vw, 2rem);
  }

  .brand__division {
    justify-self: start;
    font-size: 0.84rem;
  }

  .brand__tagline {
    font-size: 0.43rem;
  }

  .nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 14px;
    font-size: 0.76rem;
  }

  .hero {
    padding: 54px 18px 24px;
  }

  .hero__image {
    background:
      linear-gradient(90deg, rgba(17, 23, 27, 0.94), rgba(17, 23, 27, 0.72)),
      linear-gradient(0deg, rgba(17, 23, 27, 0.88), rgba(17, 23, 27, 0.16) 58%),
      url("assets/sentinell-hero-clean.webp") 60% center / cover no-repeat;
  }

  .hero__shell {
    min-height: 650px;
    gap: 34px;
  }

  .eyebrow {
    font-size: 0.74rem;
  }

  h1 {
    font-size: clamp(2.08rem, 8.5vw, 2.65rem);
  }

  h2 {
    max-width: 335px;
    font-size: clamp(1.9rem, 8vw, 2.38rem);
  }

  .section__header h2,
  .band-layout .section__header h2,
  .platform__content h2,
  .contact h2 {
    max-width: 330px;
    font-size: clamp(1.85rem, 7.6vw, 2.24rem);
    line-height: 1.08;
  }

  .hero__lead {
    max-width: 340px;
    font-size: 1.03rem;
  }

  .button {
    width: 100%;
  }

  .platform__actions {
    width: 100%;
  }

  .video-player,
  .video-card {
    aspect-ratio: auto;
    min-height: 260px;
  }

  .hero__facts,
  .service-grid {
    grid-template-columns: 1fr;
  }

  .hero__facts div {
    padding-right: 0;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  }

  .hero__facts div:last-child {
    border-bottom: 0;
  }

  .service-item {
    min-height: 0;
  }

  .contact {
    padding-left: 18px;
    padding-right: 18px;
  }

  .social-link {
    width: 100%;
  }
}