/* ========== tokens ========== */
:root {
  --ink: #0e1218;
  --ink-2: #1a2130;
  --paper: #f6f7f9;
  --paper-2: #eceff3;
  --mute: #5c6575;
  --line: rgba(14, 18, 24, 0.08);
  --blue: #1a6cff;
  --blue-deep: #0b4fd6;
  --blue-soft: #dceaff;
  --amber: #e8891c;
  --amber-deep: #b86208;
  --amber-soft: #fff0db;
  --travel-brown: #6b3a0a;
  --radius: 2px;
  --header-h: 68px;
  --font-sans: "Noto Sans SC", system-ui, sans-serif;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-latin: "Syne", var(--font-sans);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  margin: 0;
}

p {
  margin: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  opacity: 0.035;
  mix-blend-mode: multiply;
  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='4' 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;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  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, border-color 0.35s;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(246, 247, 249, 0.86);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}

.site-header.on-dark:not(.scrolled) .brand span,
.site-header.on-dark:not(.scrolled) .nav a {
  color: #fff;
}

.site-header.on-dark:not(.scrolled) .menu-btn span {
  background: #fff;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  z-index: 2;
}

.brand img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

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

.nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink);
  opacity: 0.78;
  transition: opacity 0.2s;
}

.nav a:hover {
  opacity: 1;
}

.nav-cta {
  opacity: 1 !important;
  padding: 8px 16px;
  background: var(--ink);
  color: #fff !important;
  border-radius: var(--radius);
}

.menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border: 0;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  padding: 8px;
  z-index: 2;
}

.menu-btn span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  transition: transform 0.3s var(--ease);
}

.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 80px 32px;
  gap: 28px;
}

.mobile-nav a {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
}

.mobile-nav[hidden] {
  display: none;
}

/* ========== hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  color: #fff;
  overflow: hidden;
  padding: calc(var(--header-h) + 40px) clamp(20px, 5vw, 64px) 72px;
}

.hero-visual {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 60% center;
  transform: scale(1.06);
  animation: heroDrift 28s ease-in-out infinite alternate;
}

@keyframes heroDrift {
  from { transform: scale(1.06) translate(0, 0); }
  to { transform: scale(1.1) translate(-1.5%, -1%); }
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(8, 12, 22, 0.92) 0%, rgba(8, 12, 22, 0.72) 42%, rgba(8, 12, 22, 0.35) 70%, rgba(8, 12, 22, 0.55) 100%),
    linear-gradient(to top, rgba(8, 12, 22, 0.75) 0%, transparent 45%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 70% 60% at 30% 70%, #000 20%, transparent 75%);
  opacity: 0.5;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-brand {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 22px;
  animation: rise 0.9s var(--ease) both;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 20px;
  animation: rise 0.9s 0.08s var(--ease) both;
}

.hero-lead {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(255, 255, 255, 0.78);
  max-width: 34em;
  margin-bottom: 36px;
  animation: rise 0.9s 0.16s var(--ease) both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  animation: rise 0.9s 0.24s var(--ease) both;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: none; }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: transform 0.2s var(--ease), background 0.2s, color 0.2s, border-color 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-light {
  background: #fff;
  color: var(--ink);
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: #fff;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.hero-scroll {
  position: absolute;
  right: clamp(20px, 5vw, 64px);
  bottom: 40px;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.55);
  writing-mode: vertical-rl;
}

.hero-scroll i {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.6), transparent);
  animation: pulseLine 2s ease-in-out infinite;
}

@keyframes pulseLine {
  0%, 100% { opacity: 0.35; transform: scaleY(0.7); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
}

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

.section-head.light {
  color: #fff;
}

.section-head.light .section-desc {
  color: rgba(255, 255, 255, 0.65);
}

.eyebrow {
  font-family: var(--font-latin);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 14px;
}

.eyebrow.blue { color: var(--blue); }
.eyebrow.amber { color: var(--amber-deep); }

.section-head h2,
.feature-intro h2,
.platforms h2,
.contact h2 {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  margin-bottom: 16px;
}

.section-desc,
.feature-lead {
  color: var(--mute);
  font-size: 1.05rem;
  max-width: 36em;
}

/* ========== products ========== */
.products {
  padding: clamp(72px, 10vw, 120px) clamp(20px, 5vw, 64px);
}

.product-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.product-panel {
  position: relative;
  min-height: 340px;
  padding: clamp(28px, 4vw, 44px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  border-radius: var(--radius);
  transition: transform 0.35s var(--ease);
}

.product-panel:hover {
  transform: translateY(-4px);
}

.panel-emergency {
  background: linear-gradient(145deg, #0f2a5c 0%, #163f8a 45%, #1a6cff 120%);
  color: #fff;
}

.panel-travel {
  background:
    radial-gradient(ellipse 80% 70% at 90% 20%, rgba(255, 200, 120, 0.45), transparent 55%),
    linear-gradient(160deg, #fff8ef 0%, #ffe4b8 55%, #f5c87a 100%);
  color: var(--ink);
}

.panel-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  opacity: 0.75;
  margin-bottom: 12px;
}

.panel-meta h3 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin-bottom: 10px;
}

.panel-meta p {
  font-size: 0.95rem;
  opacity: 0.8;
  max-width: 18em;
  margin-bottom: 28px;
}

.panel-link {
  font-weight: 500;
  font-size: 0.92rem;
}

.panel-emergency .panel-link { color: #c5dcff; }
.panel-travel .panel-link { color: var(--amber-deep); }

.panel-art {
  position: absolute;
  right: -10px;
  bottom: -20px;
  width: min(46%, 220px);
  opacity: 0.92;
  pointer-events: none;
  transition: transform 0.5s var(--ease);
}

.product-panel:hover .panel-art {
  transform: translate(-6px, -8px) scale(1.04);
}

.panel-art img {
  width: 100%;
  filter: drop-shadow(0 18px 30px rgba(0, 0, 0, 0.25));
}

/* ========== feature blocks ========== */
.feature-block {
  padding: clamp(72px, 10vw, 120px) clamp(20px, 5vw, 64px);
}

.emergency {
  background: #fff;
  border-top: 1px solid var(--line);
}

.travel {
  background:
    linear-gradient(180deg, #fffaf3 0%, var(--paper) 100%);
}

.feature-intro {
  max-width: 680px;
  margin-bottom: clamp(40px, 6vw, 72px);
}

.word-travel { color: var(--amber); }
.word-guard { color: var(--travel-brown); }

.feature-stage {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

.feature-stage.reverse {
  grid-template-columns: 0.95fr 1.05fr;
}

.stage-figure {
  margin: 0;
  position: relative;
}

.stage-figure img {
  width: 100%;
  border-radius: var(--radius);
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.stage-figure.warm {
  background:
    radial-gradient(circle at 30% 30%, #ffe9c2, transparent 50%),
    linear-gradient(160deg, #fff 0%, #ffe8c4 100%);
  border-radius: var(--radius);
  min-height: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px 28px;
}

.travel-compose {
  position: relative;
  width: min(100%, 280px);
  height: 280px;
}

.travel-map {
  width: 100%;
  height: auto;
  animation: floatY 5s ease-in-out infinite;
}

.travel-pin {
  position: absolute;
  width: 72px;
  top: -8px;
  right: 12px;
  animation: floatY 4s 0.6s ease-in-out infinite;
  filter: drop-shadow(0 12px 18px rgba(180, 80, 20, 0.25));
}

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.stage-figure figcaption {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--mute);
  letter-spacing: 0.04em;
}

.capability-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.capability-list li {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 6px;
}

.capability-list li:first-child {
  border-top: 1px solid var(--line);
}

.capability-list strong {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
}

.capability-list span {
  color: var(--mute);
  font-size: 0.95rem;
}

.capability-list li {
  transition: padding-left 0.3s var(--ease);
}

.capability-list li:hover {
  padding-left: 8px;
}

.amber-list li:hover strong {
  color: var(--amber-deep);
}

.capability-list:not(.amber-list) li:hover strong {
  color: var(--blue);
}

.pillars {
  margin-top: clamp(48px, 7vw, 80px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.pillar {
  background: var(--paper);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pillar em {
  font-family: var(--font-latin);
  font-style: normal;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--blue);
  letter-spacing: 0.06em;
}

.pillar span {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
}

.alarm-strip {
  margin-top: clamp(48px, 7vw, 72px);
  padding: 28px clamp(20px, 3vw, 36px);
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px 28px;
}

.alarm-strip > p {
  font-family: var(--font-display);
  font-weight: 700;
  white-space: nowrap;
}

.alarm-strip ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.alarm-strip li {
  padding: 6px 12px;
  font-size: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: rgba(255, 255, 255, 0.85);
}

/* ========== loop ========== */
.loop {
  padding: clamp(72px, 10vw, 120px) clamp(20px, 5vw, 64px);
  background:
    linear-gradient(160deg, #101826 0%, #18233a 50%, #0e1524 100%);
  color: #fff;
}

.loop-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.loop-steps li {
  padding-top: 24px;
  border-top: 2px solid rgba(255, 255, 255, 0.18);
}

.step-num {
  font-family: var(--font-latin);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: #7eb0ff;
  display: block;
  margin-bottom: 16px;
}

.loop-steps h3 {
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.loop-steps p {
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.95rem;
}

/* ========== platforms ========== */
.platforms {
  padding: clamp(64px, 9vw, 100px) clamp(20px, 5vw, 64px);
  background: var(--paper-2);
}

.platforms-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: end;
  max-width: 1100px;
}

.platforms p:not(.eyebrow) {
  color: var(--mute);
  max-width: 34em;
}

.platform-list {
  display: grid;
  gap: 0;
}

.platform-list li {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.55rem);
  font-weight: 700;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.platform-list li:first-child {
  border-top: 1px solid var(--line);
}

/* ========== contact ========== */
.contact {
  padding: clamp(72px, 10vw, 120px) clamp(20px, 5vw, 64px);
}

.contact-panel {
  max-width: 720px;
}

.contact-panel > p:not(.eyebrow) {
  color: var(--mute);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.contact-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-rows a {
  font-family: var(--font-latin);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--blue);
  width: fit-content;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
}

.contact-rows a:hover {
  border-bottom-color: var(--blue);
}

.contact-rows span {
  font-size: 0.9rem;
  color: var(--mute);
}

/* ========== footer ========== */
.site-footer {
  padding: 36px clamp(20px, 5vw, 64px) 48px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  color: var(--mute);
  font-size: 0.9rem;
}

.site-footer .footer-brand span {
  font-size: 0.95rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
}

.footer-brand img {
  width: 28px;
  height: 28px;
}

.copy {
  margin-left: auto;
}

.beian {
  width: 100%;
  margin-top: 4px;
}

.beian a {
  color: var(--mute);
  font-size: 0.85rem;
  transition: color 0.2s;
}

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

.site-footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  width: 100%;
  margin-top: 4px;
}

.site-footer .footer-links a {
  color: var(--mute);
  font-size: 0.85rem;
  transition: color 0.2s;
}

.site-footer .footer-links a:hover {
  color: var(--ink);
}

/* ========== reveal on scroll ========== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

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

/* ========== responsive ========== */
@media (max-width: 960px) {
  .nav {
    display: none;
  }

  .menu-btn {
    display: flex;
  }

  .product-split,
  .feature-stage,
  .feature-stage.reverse,
  .loop-steps,
  .platforms-inner,
  .pillars {
    grid-template-columns: 1fr;
  }

  .feature-stage.reverse .capability-list {
    order: 2;
  }

  .panel-art {
    width: 160px;
  }

  .product-panel {
    min-height: 280px;
  }

  .hero-scroll {
    display: none;
  }

  .copy {
    margin-left: 0;
    width: 100%;
  }
}

@media (max-width: 560px) {
  .hero {
    align-items: center;
    padding-bottom: 56px;
  }

  .hero h1 br {
    display: none;
  }

  .alarm-strip {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .hero-visual img {
    transform: none;
  }
}