:root {
  --color-red: #e92a1f;
  --color-red-dark: #bd2118;
  --color-black: #0a0a0a;
  --color-ink: #171717;
  --color-muted: #666666;
  --color-line: #dddddd;
  --color-soft: #f4f4f2;
  --color-white: #ffffff;
  --content-width: 1180px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.12);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-ink);
  background: var(--color-white);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-red);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 16px;
  color: var(--color-white);
  background: var(--color-red);
  border-radius: 4px;
  font-weight: 800;
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 40px), var(--content-width));
  margin-inline: auto;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--color-red);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-heading {
  max-width: 700px;
  margin-bottom: 42px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2.5rem, 3.2vw, 2.875rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.section-heading p:last-child {
  max-width: 610px;
  margin: 20px 0 0;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  color: var(--color-white);
  background: rgba(10, 10, 10, 0.96);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header--solid {
  color: var(--color-white);
  background: var(--color-black);
}

.site-header--solid + main {
  padding-top: 87px;
}

#doi-tuong,
#ung-dung,
.legal-section {
  scroll-margin-top: 107px;
}

.header-inner {
  display: flex;
  min-height: 86px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  text-decoration: none;
}

.brand img {
  width: 126px;
  height: 58px;
  object-fit: cover;
  object-position: center;
}

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

.site-nav > a {
  position: relative;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: color 180ms ease;
}

.site-nav > a::after {
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 2px;
  background: var(--color-red);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.site-nav > a:hover,
.site-nav > a[aria-current="page"] {
  color: var(--color-white);
}

.site-nav > a:hover::after,
.site-nav > a[aria-current="page"]::after {
  transform: scaleX(1);
}

.download-dropdown {
  position: relative;
  flex: 0 0 auto;
}

.download-button {
  display: inline-flex;
  min-height: 42px;
  padding: 0 16px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--color-white);
  background: var(--color-red);
  border: 0;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.045em;
  line-height: 1;
  text-transform: uppercase;
  transition: background 180ms ease, transform 180ms ease;
}

.download-button:hover,
.download-button[aria-expanded="true"] {
  background: var(--color-red-dark);
}

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

.download-chevron {
  width: 14px;
  height: 14px;
  transition: transform 180ms ease;
}

.download-button[aria-expanded="true"] .download-chevron {
  transform: rotate(180deg);
}

.download-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  width: 250px;
  margin: 0;
  padding: 8px;
  color: var(--color-ink);
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  box-shadow: 0 20px 55px rgba(0, 0, 0, 0.3);
  list-style: none;
}

.download-menu[hidden] {
  display: none;
}

.download-menu a {
  display: flex;
  min-height: 58px;
  padding: 10px 12px;
  align-items: center;
  gap: 12px;
  color: var(--color-ink);
  border-radius: 5px;
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1.25;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease;
}

.download-menu a:hover,
.download-menu a:focus-visible {
  color: var(--color-red-dark);
  background: var(--color-soft);
}

.store-icon {
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  padding: 0;
  color: var(--color-white);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
  content: "";
  transition: transform 180ms ease, opacity 180ms ease;
}

.nav-toggle[aria-expanded="true"] span {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"]::before {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"]::after {
  transform: translateY(-7px) rotate(-45deg);
}

.hero {
  position: relative;
  min-height: 760px;
  overflow: hidden;
  color: var(--color-white);
  background:
    radial-gradient(circle at 73% 34%, rgba(233, 42, 31, 0.17), transparent 30%),
    linear-gradient(116deg, #080808 0%, #111111 60%, #080808 100%);
}

.hero::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 58%;
  width: 1px;
  background: rgba(255, 255, 255, 0.08);
  content: "";
}

.hero::after {
  position: absolute;
  right: -120px;
  bottom: -250px;
  width: 560px;
  height: 560px;
  border: 1px solid rgba(233, 42, 31, 0.2);
  border-radius: 50%;
  box-shadow: 0 0 0 80px rgba(233, 42, 31, 0.025), 0 0 0 160px rgba(233, 42, 31, 0.018);
  content: "";
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 760px;
  padding-top: 138px;
  padding-bottom: 66px;
  align-items: center;
  grid-template-columns: minmax(0, 1.04fr) minmax(350px, 0.96fr);
  gap: clamp(44px, 7vw, 100px);
}

.hero-copy h1 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(3.75rem, 4.2vw, 4.25rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.hero-copy h1 span {
  display: block;
  color: var(--color-red);
}

.hero-copy > p:not(.eyebrow) {
  max-width: 590px;
  margin: 28px 0 34px;
  color: rgba(255, 255, 255, 0.7);
  font-size: clamp(1rem, 1.25vw, 1.125rem);
}

.button {
  display: inline-flex;
  min-height: 54px;
  padding: 0 24px;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--color-white);
  background: var(--color-red);
  border: 2px solid var(--color-red);
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.button::after {
  content: "→";
  font-size: 1.2rem;
}

.button:hover {
  background: var(--color-red-dark);
  border-color: var(--color-red-dark);
  transform: translateY(-2px);
}

.media-placeholder {
  position: relative;
  display: grid;
  overflow: hidden;
  place-items: center;
  color: rgba(255, 255, 255, 0.55);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.015)),
    #161616;
  border: 1px solid rgba(255, 255, 255, 0.17);
}

.media-placeholder::before,
.media-placeholder::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.media-placeholder::before {
  inset: 24px;
  border: 1px solid rgba(255, 255, 255, 0.11);
}

.media-placeholder::after {
  top: 50%;
  left: 50%;
  width: 150%;
  height: 1px;
  background: rgba(255, 255, 255, 0.07);
  transform: translate(-50%, -50%) rotate(-38deg);
}

.placeholder-label {
  position: relative;
  z-index: 1;
  display: inline-flex;
  padding: 9px 12px;
  align-items: center;
  gap: 8px;
  background: rgba(0, 0, 0, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.placeholder-label::before {
  width: 7px;
  height: 7px;
  background: var(--color-red);
  border-radius: 50%;
  content: "";
}

.hero-media {
  min-height: 540px;
  aspect-ratio: 4 / 5;
  border-radius: 0;
  box-shadow: var(--shadow);
}

.hero-media::before,
.hero-media::after {
  content: none;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.audiences {
  padding: 104px 0 112px;
  background: var(--color-white);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.audience-card {
  display: grid;
  min-height: 510px;
  overflow: hidden;
  color: var(--color-white);
  background: var(--color-black);
  grid-template-rows: 480px 1fr;
}

.audience-card:nth-child(2) {
  background: #171717;
}

.audience-media {
  display: grid;
  min-height: 0;
  overflow: hidden;
  background: #111111;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.audience-media img {
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: cover;
  object-position: top center;
}

.audience-content {
  padding: 34px clamp(26px, 4vw, 44px) 38px;
}

.audience-index {
  color: var(--color-red);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.audience-content h3 {
  margin: 10px 0 18px;
  font-size: clamp(1.625rem, 2.2vw, 1.875rem);
  font-weight: 650;
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.feature-list {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 12px;
  list-style: none;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.72);
  font-weight: 400;
  line-height: 1.6;
}

.feature-list li::before {
  width: 18px;
  height: 2px;
  flex: 0 0 auto;
  background: var(--color-red);
  content: "";
}

.app-showcase {
  position: relative;
  overflow: hidden;
  padding: 112px 0 120px;
  background: var(--color-soft);
}

.app-showcase::before {
  position: absolute;
  top: -170px;
  right: -140px;
  width: 460px;
  height: 460px;
  border: 70px solid rgba(233, 42, 31, 0.045);
  border-radius: 50%;
  content: "";
}

.app-grid {
  position: relative;
  display: grid;
  align-items: start;
  grid-template-columns: minmax(300px, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(44px, 8vw, 110px);
}

.app-copy {
  position: sticky;
  top: 36px;
}

.app-copy .section-heading {
  margin-bottom: 34px;
}

.capability-list {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 0;
  border-top: 1px solid #cacaca;
  list-style: none;
}

.capability-list li {
  display: grid;
  padding: 19px 0;
  align-items: baseline;
  border-bottom: 1px solid #cacaca;
  grid-template-columns: 46px 1fr;
}

.capability-list span {
  color: var(--color-red);
  font-size: 0.75rem;
  font-weight: 900;
}

.capability-list strong {
  font-size: 1rem;
}

.screen-grid {
  display: grid;
  align-items: start;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.screen-placeholder {
  width: 100%;
  min-height: 0;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 1242 / 2688;
  background: #101010;
  border: 1px solid rgba(0, 0, 0, 0.14);
  border-radius: 26px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.1);
}

.screen-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.screen-placeholder:nth-child(2) {
  margin-top: 70px;
}

.screen-placeholder .placeholder-label {
  max-width: calc(100% - 30px);
  justify-content: center;
  text-align: center;
}

.site-footer {
  color: var(--color-white);
  background: var(--color-black);
}

.footer-main {
  display: grid;
  padding: 72px 0 60px;
  grid-template-columns: minmax(250px, 1.1fr) repeat(2, minmax(170px, 0.45fr));
  gap: 50px;
}

.footer-brand p {
  max-width: 480px;
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.58);
}

.footer-title {
  margin: 0 0 18px;
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 10px;
  list-style: none;
}

.footer-links a {
  display: inline-block;
  color: rgba(255, 255, 255, 0.78);
  font-weight: 650;
  text-decoration: none;
  transition: color 180ms ease, transform 180ms ease;
}

.footer-links a:hover {
  color: var(--color-white);
  transform: translateX(3px);
}

.footer-bottom {
  display: flex;
  padding: 24px 0 30px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: rgba(255, 255, 255, 0.42);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.78rem;
}

/* Legal pages */
.legal-hero {
  padding: 84px 0 78px;
  color: var(--color-white);
  background:
    radial-gradient(circle at 80% 20%, rgba(233, 42, 31, 0.18), transparent 28%),
    #0d0d0d;
}

.legal-hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2.7rem, 7vw, 5.5rem);
  line-height: 0.98;
  letter-spacing: -0.06em;
}

.legal-hero p:last-child {
  max-width: 660px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.67);
  font-size: 1.04rem;
}

.legal-layout {
  display: grid;
  padding-top: 72px;
  padding-bottom: 110px;
  align-items: start;
  grid-template-columns: 235px minmax(0, 780px);
  gap: clamp(50px, 9vw, 120px);
}

.legal-toc {
  position: sticky;
  top: 28px;
  padding: 24px;
  background: var(--color-soft);
  border-top: 4px solid var(--color-red);
}

.legal-toc p {
  margin: 0 0 12px;
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.legal-toc a {
  display: block;
  padding: 8px 0;
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.legal-toc a:hover {
  color: var(--color-red-dark);
}

.legal-source-note {
  margin: 0 0 42px;
  padding: 20px 22px;
  color: #474747;
  background: #fff8f7;
  border-left: 4px solid var(--color-red);
  font-size: 0.93rem;
}

.legal-source-note a {
  color: var(--color-red-dark);
  font-weight: 750;
}

.legal-intro {
  margin-bottom: 50px;
  color: #444;
  font-size: 1.02rem;
  white-space: pre-line;
}

.legal-section + .legal-section {
  margin-top: 72px;
  padding-top: 68px;
  border-top: 1px solid var(--color-line);
}

.legal-section > h2 {
  margin: 0 0 8px;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
}

.legal-subtitle {
  margin: 0 0 38px;
  color: var(--color-muted);
}

.legal-item {
  margin-bottom: 36px;
  scroll-margin-top: 30px;
}

.legal-item h3 {
  margin: 0 0 12px;
  padding-left: 16px;
  border-left: 3px solid var(--color-red);
  font-size: 1.08rem;
  line-height: 1.35;
}

.legal-item p {
  margin: 0;
  color: #474747;
  font-size: 0.96rem;
  white-space: pre-line;
}

.legal-item a {
  color: var(--color-red-dark);
  font-weight: 750;
}

@media (min-width: 1081px) {
  .hero-copy h1 {
    width: max-content;
  }
}

@media (max-width: 1080px) {
  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    bottom: auto;
    left: 0;
    display: flex;
    max-height: calc(100vh - 87px);
    max-height: calc(100dvh - 87px);
    padding: 24px 24px calc(24px + env(safe-area-inset-bottom));
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: rgba(8, 8, 8, 0.98);
    opacity: 0;
    pointer-events: none;
    -webkit-overflow-scrolling: touch;
    transition: opacity 180ms ease;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav > a {
    width: 100%;
    padding: 10px 0;
    font-size: 0.9375rem;
  }

  .site-nav > a::after {
    bottom: 5px;
  }

  .nav-toggle {
    display: block;
  }

  .download-dropdown {
    width: 100%;
    margin-top: 10px;
  }

  .download-button {
    width: 100%;
    min-height: 52px;
    justify-content: space-between;
    padding-inline: 18px;
  }

  .download-menu {
    position: static;
    width: 100%;
    margin-top: 8px;
    box-shadow: none;
  }
}

@media (max-width: 980px) {

  .hero-inner {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.75fr);
    gap: 40px;
  }

  .legal-layout {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 48px;
  }
}

@media (max-width: 800px) {
  .container {
    width: min(calc(100% - 32px), var(--content-width));
  }

  .header-inner {
    min-height: 76px;
  }

  .brand img {
    width: 108px;
    height: 50px;
  }

  .site-nav {
    max-height: calc(100vh - 77px);
    max-height: calc(100dvh - 77px);
  }

  .hero-inner {
    padding-top: 130px;
    padding-bottom: 54px;
    grid-template-columns: 1fr;
  }

  .hero-copy h1 {
    font-size: clamp(2.25rem, 10.8vw, 2.625rem);
  }

  .section-heading h2 {
    font-size: clamp(1.75rem, 8vw, 2.125rem);
  }

  .audience-content h3 {
    font-size: clamp(1.375rem, 6vw, 1.625rem);
  }

  .hero-copy > p:not(.eyebrow),
  .section-heading p:last-child {
    font-size: 1rem;
  }

  .hero-media {
    min-height: 400px;
    aspect-ratio: 5 / 4;
    border-radius: 0;
  }

  .audiences,
  .app-showcase {
    padding: 82px 0;
  }

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

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

  .app-copy {
    position: static;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .legal-layout {
    grid-template-columns: 1fr;
  }

  .legal-toc {
    position: static;
  }

  .site-header--solid + main {
    padding-top: 77px;
  }

  #doi-tuong,
  #ung-dung,
  .legal-section {
    scroll-margin-top: 97px;
  }
}

@media (max-width: 560px) {
  .hero {
    min-height: auto;
  }

  .hero-inner {
    min-height: auto;
  }

  .hero-copy > p:not(.eyebrow) {
    margin: 22px 0 28px;
  }

  .hero-media {
    min-height: 360px;
    aspect-ratio: 4 / 5;
  }

  .section-heading {
    margin-bottom: 30px;
  }

  .audience-card {
    grid-template-rows: 430px 1fr;
  }

  .screen-grid {
    display: flex;
    width: 100%;
    padding: 0 20px 10px;
    overflow-x: auto;
    gap: 16px;
    overscroll-behavior-x: contain;
    scroll-padding-inline: 20px;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .screen-grid::-webkit-scrollbar {
    display: none;
  }

  .screen-placeholder,
  .screen-placeholder:nth-child(2),
  .screen-placeholder:nth-child(3) {
    flex: 0 0 100%;
    margin-top: 0;
    scroll-snap-align: center;
    scroll-snap-stop: always;
  }

  .footer-main {
    grid-template-columns: 1fr;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .legal-hero {
    padding: 64px 0 60px;
  }

  .legal-layout {
    padding-top: 52px;
    padding-bottom: 80px;
    gap: 38px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}