:root {
  --orange: #f58220;
  --orange-deep: #d96a0c;
  --orange-soft: rgba(245, 130, 32, 0.16);
  --ink: #14110e;
  --ink-soft: #3a322b;
  --muted: #7a6f64;
  --paper: #f7f3ee;
  --paper-2: #efe8df;
  --line: rgba(20, 17, 14, 0.1);
  --white: #fffaf6;
  --font-brand: "Segoe UI Variable Display", "Segoe UI", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-display: "Segoe UI Variable Display", "Segoe UI", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-body: "Segoe UI", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --max: 1120px;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

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

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 4vw, 48px);
  transition: background 0.35s var(--ease), backdrop-filter 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header.is-solid {
  background: rgba(247, 243, 238, 0.88);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--line);
}

.site-header.is-solid .brand,
.site-header.is-solid .nav a {
  color: var(--ink);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-family: var(--font-brand);
  font-size: clamp(0.85rem, 1.6vw, 1.15rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  max-width: min(52vw, 420px);
  line-height: 1.25;
}

.brand span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.25);
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav a {
  color: rgba(255, 250, 246, 0.82);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav a:hover {
  color: var(--white);
}

.nav-cta {
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--orange);
  color: var(--white) !important;
}

.site-header.is-solid .nav-cta {
  color: var(--white) !important;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  padding: 12px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 6px 0;
  background: currentColor;
  transition: transform 0.25s var(--ease);
}

.site-header:not(.is-solid) .nav-toggle {
  color: var(--white);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  z-index: 39;
  gap: 4px;
  padding: 16px 20px 24px;
  background: rgba(247, 243, 238, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.mobile-nav.is-open {
  display: grid;
}

.mobile-nav a {
  padding: 14px 8px;
  font-weight: 600;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--white);
  overflow: hidden;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(245, 130, 32, 0.35), transparent 50%),
    linear-gradient(160deg, #1c140e 0%, #0f0d0b 45%, #2a1a10 100%);
}

.hero-media {
  position: absolute;
  inset: 0;
  background: #14110e;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.06);
  animation: heroZoom 18s var(--ease) forwards;
}

@keyframes heroZoom {
  to {
    transform: scale(1);
  }
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(12, 10, 8, 0.35) 0%, rgba(12, 10, 8, 0.2) 35%, rgba(12, 10, 8, 0.78) 100%),
    linear-gradient(90deg, rgba(245, 130, 32, 0.22), transparent 45%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: calc(var(--header-h) + 48px) clamp(20px, 4vw, 48px) 96px;
}

.hero-brand {
  margin: 0 0 18px;
  font-family: var(--font-brand);
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  line-height: 1;
  letter-spacing: 0.06em;
  text-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
}

.hero h1 {
  margin: 0;
  max-width: 12ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 22px 0 0;
  max-width: 28ch;
  color: rgba(255, 250, 246, 0.84);
  font-size: clamp(1rem, 1.6vw, 1.15rem);
}

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

.hero-scroll {
  position: absolute;
  right: clamp(20px, 4vw, 48px);
  bottom: 36px;
  z-index: 1;
  color: rgba(255, 250, 246, 0.55);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  writing-mode: vertical-rl;
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.45;
    transform: translateY(0);
  }
  50% {
    opacity: 0.9;
    transform: translateY(6px);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s var(--ease), background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--orange);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--orange-deep);
}

.btn-ghost {
  border-color: rgba(255, 250, 246, 0.45);
  color: var(--white);
  background: rgba(255, 255, 255, 0.06);
}

.btn-ghost:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.12);
}

.btn-block {
  width: 100%;
}

/* Sections */
.section {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: clamp(72px, 12vw, 120px) clamp(20px, 4vw, 48px);
}

.section-head {
  max-width: 640px;
  margin-bottom: clamp(40px, 6vw, 64px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--orange);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.section h2,
.scene-copy h2,
.platform-copy h2,
.contact-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.section-desc,
.scene-copy p,
.platform-copy p,
.contact-copy p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

/* Services */
.service-list {
  border-top: 1px solid var(--line);
}

.service-row {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 24px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.25s ease, padding-left 0.25s var(--ease);
}

.service-row:hover {
  background: linear-gradient(90deg, var(--orange-soft), transparent 60%);
  padding-left: 12px;
}

.service-index {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--orange);
}

.service-body h3 {
  margin: 0 0 8px;
  font-size: 1.25rem;
}

.service-body p {
  margin: 0;
  max-width: 48ch;
  color: var(--muted);
}

.service-tag {
  color: var(--ink-soft);
  font-size: 0.85rem;
  white-space: nowrap;
  padding-top: 4px;
}

/* Scene */
.scene {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
  width: min(100%, 1280px);
}

.scene-media {
  margin-left: clamp(-20px, -4vw, -48px);
  overflow: hidden;
  min-height: 420px;
}

.scene-media img {
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.scene-copy {
  padding-right: clamp(0px, 2vw, 24px);
}

/* Partners */
.partners {
  background:
    radial-gradient(ellipse at top left, rgba(245, 130, 32, 0.12), transparent 55%),
    linear-gradient(180deg, var(--paper-2), var(--paper));
  width: 100%;
  max-width: none;
  padding-left: max(clamp(20px, 4vw, 48px), calc((100% - var(--max)) / 2 + clamp(20px, 4vw, 48px)));
  padding-right: max(clamp(20px, 4vw, 48px), calc((100% - var(--max)) / 2 + clamp(20px, 4vw, 48px)));
}

.partner-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.partner-item {
  background: rgba(247, 243, 238, 0.92);
  padding: clamp(28px, 4vw, 40px);
}

.partner-item h3 {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.partner-item p {
  margin: 0;
  color: var(--muted);
}

/* Platform */
.platform {
  width: min(100%, 1280px);
}

.platform-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  padding: clamp(36px, 6vw, 64px);
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(245, 130, 32, 0.28), transparent 42%),
    linear-gradient(160deg, #221910 0%, #14110e 55%, #2a1c10 100%);
}

.platform-copy .eyebrow {
  color: #ffb067;
}

.platform-copy p {
  color: rgba(255, 250, 246, 0.72);
}

.platform-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.platform-points li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 250, 246, 0.12);
  color: rgba(255, 250, 246, 0.82);
}

.platform-points span {
  color: var(--orange);
  font-weight: 700;
}

/* Contact */
.contact {
  width: min(100%, var(--max));
}

.contact-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: clamp(24px, 4vw, 36px);
  background: var(--white);
  border: 1px solid var(--line);
  /* interaction container — allowed */
  box-shadow: 0 18px 50px rgba(20, 17, 14, 0.06);
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.contact-form label {
  display: grid;
  gap: 8px;
}

.contact-form label span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 10px;
  padding: 12px 14px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--orange);
  box-shadow: 0 0 0 3px var(--orange-soft);
}

.form-note {
  margin: 0;
  min-height: 1.4em;
  font-size: 0.9rem;
  color: var(--muted);
}

.form-note.is-ok {
  color: #2f7a3e;
}

.form-note.is-err {
  color: #b42318;
}

/* Footer */
.site-footer {
  display: grid;
  gap: 24px;
  padding: 48px clamp(20px, 4vw, 48px) 36px;
  border-top: 1px solid var(--line);
  background: #ece4da;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-brand img {
  border-radius: 50%;
}

.footer-brand strong {
  display: block;
  font-family: var(--font-brand);
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  letter-spacing: 0.02em;
  line-height: 1.35;
}

.footer-brand p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.copyright {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

/* Reveal — only hide when JS is available */
.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.js .reveal.is-in,
.reveal {
  opacity: 1;
  transform: none;
}

.delay-1 {
  transition-delay: 0.1s;
}
.delay-2 {
  transition-delay: 0.2s;
}
.delay-3 {
  transition-delay: 0.3s;
}

@media (max-width: 900px) {
  .nav {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .scene,
  .platform-panel,
  .contact-inner {
    grid-template-columns: 1fr;
  }

  .scene-media {
    margin-left: 0;
    min-height: 280px;
  }

  .scene-media img {
    min-height: 280px;
  }

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

  .service-row {
    grid-template-columns: 48px 1fr;
  }

  .service-tag {
    grid-column: 2;
    padding-top: 0;
  }

  .hero-scroll {
    display: none;
  }
}

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

  .hero-brand {
    font-size: clamp(2.4rem, 14vw, 3.4rem);
  }

  .platform-panel {
    padding: 28px 22px;
  }
}