:root {
  --ink: #e8eef4;
  --ink-dim: #9aa8b8;
  --graphite: #0c1118;
  --steel-deep: #121a24;
  --steel: #1a2838;
  --steel-mid: #2a4058;
  --accent: #e85d04;
  --accent-hot: #ff7a1a;
  --line: rgba(232, 238, 244, 0.14);
  --font-display: "Syne", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--graphite);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* —— Nav —— */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.9rem clamp(1rem, 4vw, 2.5rem);
  background: linear-gradient(180deg, rgba(12, 17, 24, 0.92), rgba(12, 17, 24, 0.55) 70%, transparent);
  backdrop-filter: blur(8px);
}

.nav__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.nav__links {
  display: flex;
  gap: 1.25rem;
  margin-left: auto;
  font-size: 0.9rem;
  color: var(--ink-dim);
}

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

.nav__phone {
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--accent-hot);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .nav__links {
    display: none;
  }
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  padding: clamp(5.5rem, 12vh, 7rem) clamp(1.25rem, 4vw, 2.5rem) clamp(2.5rem, 6vh, 4rem);
  isolation: isolate;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: var(--steel-deep);
}

.hero__video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.02);
  animation: video-settle 1.4s ease both;
}

.hero__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, rgba(12, 17, 24, 0.88) 0%, rgba(12, 17, 24, 0.55) 48%, rgba(12, 17, 24, 0.35) 100%),
    linear-gradient(0deg, rgba(12, 17, 24, 0.85) 0%, transparent 42%);
  animation: veil-in 1.1s ease both;
}

.hero__content {
  max-width: 720px;
  animation: rise 0.9s 0.15s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero__brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 8vw, 4.25rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
  margin-bottom: 0.85rem;
}

.hero__title {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: clamp(1.25rem, 3.5vw, 1.65rem);
  letter-spacing: 0.08em;
  color: var(--ink);
  margin-bottom: 0.75rem;
}

.hero__lead {
  max-width: 32rem;
  color: var(--ink-dim);
  font-size: 1.05rem;
  margin-bottom: 1.75rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.85rem 1.35rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease, color 0.2s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--accent-hot);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn--ghost:hover {
  border-color: rgba(232, 238, 244, 0.4);
  background: rgba(255, 255, 255, 0.06);
}

.btn--sound {
  background: rgba(0, 0, 0, 0.35);
  border-color: var(--line);
  color: var(--ink-dim);
  font-size: 0.85rem;
}

.btn--sound[aria-pressed="true"] {
  color: var(--ink);
  border-color: rgba(232, 93, 4, 0.55);
}

/* —— Shared sections —— */
.specs,
.advantage,
.core,
.keywords,
.footage,
.contact {
  padding: clamp(3.5rem, 10vh, 6rem) clamp(1.25rem, 4vw, 2.5rem);
  max-width: 1100px;
  margin: 0 auto;
}

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-hot);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4.5vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
  margin-bottom: 1rem;
}

.section-lead {
  max-width: 40rem;
  color: var(--ink-dim);
  font-size: 1.05rem;
  margin-bottom: 2.25rem;
}

/* —— Specs —— */
.specs {
  border-top: 1px solid var(--line);
}

.specs__row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem 1rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

.specs__item {
  padding-top: 1.5rem;
}

.specs__item dt {
  font-size: 0.85rem;
  color: var(--ink-dim);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.specs__item dd {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  letter-spacing: 0.02em;
}

.specs__item dd span {
  font-size: clamp(2.5rem, 7vw, 3.75rem);
  line-height: 1;
  color: var(--ink);
  margin-right: 0.15em;
}

@media (max-width: 640px) {
  .specs__row {
    grid-template-columns: 1fr;
  }
}

/* —— Advantage —— */
.advantage {
  background: linear-gradient(180deg, transparent, rgba(26, 40, 56, 0.45) 20%, rgba(26, 40, 56, 0.45) 80%, transparent);
  max-width: none;
  padding-left: max(clamp(1.25rem, 4vw, 2.5rem), calc((100% - 1100px) / 2 + clamp(1.25rem, 4vw, 2.5rem)));
  padding-right: max(clamp(1.25rem, 4vw, 2.5rem), calc((100% - 1100px) / 2 + clamp(1.25rem, 4vw, 2.5rem)));
}

.advantage__list {
  list-style: none;
  display: grid;
  gap: 0;
  max-width: 1100px;
  border-top: 1px solid var(--line);
}

.advantage__list li {
  display: grid;
  grid-template-columns: minmax(7rem, 10rem) 1fr;
  gap: 1rem 1.5rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.advantage__list strong {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
}

.advantage__list span {
  color: var(--ink-dim);
}

@media (max-width: 560px) {
  .advantage__list li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

/* —— Core —— */
.core__stack {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  letter-spacing: 0.12em;
  color: var(--steel-mid);
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.keywords__list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}

.keywords__list li {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.keywords__list li:nth-child(odd) {
  padding-right: 1.25rem;
}

.keywords__list li:nth-child(even) {
  padding-left: 1.25rem;
  border-left: 1px solid var(--line);
}

@media (max-width: 640px) {
  .keywords__list {
    grid-template-columns: 1fr;
  }

  .keywords__list li:nth-child(odd),
  .keywords__list li:nth-child(even) {
    padding-left: 0;
    padding-right: 0;
    border-left: none;
  }
}

/* —— Footage —— */
.footage__frame {
  position: relative;
  width: 100%;
  background: var(--steel-deep);
  overflow: hidden;
  border: 1px solid var(--line);
}

.footage__video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #000;
}

/* —— Contact —— */
.contact {
  border-top: 1px solid var(--line);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2.5rem 3rem;
  align-items: end;
  padding-top: 0.5rem;
}

.contact__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.75rem;
  margin-bottom: 0.35rem;
}

.contact__tel {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.1;
  color: var(--accent-hot);
  letter-spacing: 0.02em;
  margin-bottom: 0.5rem;
}

.contact__tel:hover {
  color: var(--accent);
}

.contact__hint {
  color: var(--ink-dim);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.contact__qr {
  text-align: center;
}

.contact__qr img {
  width: min(220px, 70vw);
  height: auto;
  background: #fff;
  padding: 0.65rem;
  margin: 0 auto 0.75rem;
}

.contact__qr figcaption {
  font-size: 0.85rem;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
}

@media (max-width: 640px) {
  .contact__grid {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .contact__qr {
    text-align: left;
  }

  .contact__qr img {
    margin-left: 0;
  }
}

/* —— Footer —— */
.footer {
  padding: 2.5rem clamp(1.25rem, 4vw, 2.5rem) 3rem;
  border-top: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.footer__main {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.footer__main p:first-child {
  color: var(--ink);
  font-weight: 500;
}

.footer__seo {
  font-size: 0.78rem;
  line-height: 1.5;
  opacity: 0.75;
  max-width: 52rem;
}

/* —— Motion —— */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes veil-in {
  from { opacity: 0.4; }
  to { opacity: 1; }
}

@keyframes video-settle {
  from {
    opacity: 0;
    transform: scale(1.08);
  }
  to {
    opacity: 1;
    transform: scale(1.02);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero__content,
  .hero__video,
  .hero__veil,
  .reveal {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}