/* Drops landing — design tokens từ DESIGN.md (Kinetic Architectural Precision) */

:root {
  --color-primary: #ae2a00;
  --color-primary-container: #da3700;
  --color-on-primary: #ffffff;
  --color-background: #f8f9fb;
  --color-surface: #f8f9fb;
  --color-surface-low: #f2f4f6;
  --color-surface-high: #e8eaed;
  --color-surface-highest: #e1e2e4;
  --color-surface-lowest: #ffffff;
  --color-on-surface: #0b0b0d;
  --color-on-surface-variant: #5c6269;
  --color-outline-variant: #70777d;
  --color-tertiary: #1a1d21;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --shadow-float: 0 20px 40px rgba(11, 11, 13, 0.06);
  --radius-sm: 4px;
  --radius-md: 8px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --wrap: min(1120px, 100% - 2rem);
  --ease-spring: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 0.2s;
  --t-med: 0.32s;
  --shadow-hover: 0 28px 56px rgba(11, 11, 13, 0.1);
  --shadow-hover-soft: 0 22px 48px rgba(11, 11, 13, 0.08);
  /* Chiều cao header ước lượng — JS có thể ghi đè qua --site-header-h */
  --site-header-h: 4.5rem;
}

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

html {
  scroll-behavior: smooth;
}

/* Lenis: tránh xung đột scroll-behavior (chỉ khi bật Lenis trong main.js) */
html.lenis,
html.lenis body {
  height: auto;
}

.lenis.lenis-smooth {
  scroll-behavior: auto !important;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--color-on-surface);
  background: var(--color-background);
  position: relative;
  min-height: 100vh;
}

.blueprint-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  cursor: default;
  background-color: var(--color-background);
  background-image:
    linear-gradient(
      color-mix(in srgb, var(--color-outline-variant) 5%, transparent) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      color-mix(in srgb, var(--color-outline-variant) 5%, transparent) 1px,
      transparent 1px
    );
  background-size: 24px 24px;
}

.geo-frame {
  position: fixed;
  inset: 0;
  z-index: 0;
  cursor: default;
  overflow: hidden;
}

/* Nền: các khối vuông xếp chồng (orthogonal), gợi bố cục “stack” kiểu product landing */
.block-stack {
  --sq: clamp(56px, 8vw, 104px);
  --sq-gap: calc(var(--sq) * 0.22);
}

@media (max-width: 640px) {
  .block-stack {
    --sq: clamp(44px, 14vw, 72px);
    opacity: 0.72;
  }
}

.block-stack__cluster {
  position: absolute;
  width: calc(var(--sq) * 3.2);
  height: calc(var(--sq) * 3.2);
}

.block-stack__cluster--tr {
  top: 6%;
  right: 3%;
}

.block-stack__cluster--bl {
  bottom: 8%;
  left: 2%;
}

.block-stack__cluster--tl {
  top: 22%;
  left: 4%;
  width: calc(var(--sq) * 2.4);
  height: calc(var(--sq) * 2.4);
  opacity: 0.85;
}

.block-stack__cluster--br {
  bottom: 28%;
  right: 6%;
  width: calc(var(--sq) * 2.2);
  height: calc(var(--sq) * 2.2);
  opacity: 0.9;
}

.stack-sq {
  position: absolute;
  width: var(--sq);
  height: var(--sq);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-float);
}

/* Góc phải trên — stack 4 lớp */
.block-stack__cluster--tr .stack-sq--a {
  top: 0;
  right: 0;
  z-index: 4;
  background: linear-gradient(
    145deg,
    var(--color-primary) 0%,
    var(--color-primary-container) 100%
  );
}

.block-stack__cluster--tr .stack-sq--b {
  top: var(--sq-gap);
  right: var(--sq-gap);
  z-index: 3;
  background: var(--color-surface-lowest);
  opacity: 0.95;
}

.block-stack__cluster--tr .stack-sq--c {
  top: calc(var(--sq-gap) * 2);
  right: calc(var(--sq-gap) * 2);
  z-index: 2;
  background: var(--color-on-surface);
  opacity: 0.08;
}

.block-stack__cluster--tr .stack-sq--d {
  top: calc(var(--sq-gap) * 3);
  right: calc(var(--sq-gap) * 3);
  z-index: 1;
  background: var(--color-surface-highest);
}

/* Góc trái dưới */
.block-stack__cluster--bl .stack-sq--e {
  bottom: 0;
  left: 0;
  z-index: 3;
  background: linear-gradient(
    135deg,
    var(--color-primary-container) 0%,
    var(--color-primary) 100%
  );
  opacity: 0.55;
}

.block-stack__cluster--bl .stack-sq--f {
  bottom: var(--sq-gap);
  left: var(--sq-gap);
  z-index: 2;
  background: var(--color-surface-lowest);
  opacity: 0.92;
  box-shadow: 0 12px 28px rgba(11, 11, 13, 0.05);
}

.block-stack__cluster--bl .stack-sq--g {
  bottom: calc(var(--sq-gap) * 2);
  left: calc(var(--sq-gap) * 2);
  z-index: 1;
  background: var(--color-on-surface);
  opacity: 0.06;
}

/* Góc trái trên — 2 khối */
.block-stack__cluster--tl .stack-sq--h {
  top: 0;
  left: 0;
  z-index: 2;
  background: var(--color-surface-highest);
}

.block-stack__cluster--tl .stack-sq--i {
  top: var(--sq-gap);
  left: var(--sq-gap);
  z-index: 1;
  background: var(--color-primary);
  opacity: 0.25;
}

/* Góc phải dưới */
.block-stack__cluster--br .stack-sq--j {
  bottom: 0;
  right: 0;
  z-index: 2;
  background: var(--color-on-surface);
  opacity: 0.07;
}

.block-stack__cluster--br .stack-sq--k {
  bottom: var(--sq-gap);
  right: var(--sq-gap);
  z-index: 1;
  background: var(--color-surface-lowest);
  opacity: 0.88;
}

.wrap {
  width: var(--wrap);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-surface-lowest) 82%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  overflow: visible;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-sm);
  overflow: visible;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: inherit;
  transition: opacity var(--t-fast) var(--ease-spring);
}

.brand:hover {
  opacity: 0.92;
}

.brand:active {
  opacity: 0.85;
}

.brand__logo {
  display: block;
  border-radius: var(--radius-sm);
  transition: transform var(--t-med) var(--ease-spring);
}

.brand:hover .brand__logo {
  transform: scale(1.06) rotate(-2deg);
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.04em;
  font-size: 1.25rem;
  transition: color var(--t-fast) ease;
}

.brand:hover .brand__name {
  color: var(--color-primary);
}

.nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  overflow: visible;
}

.nav__legal {
  display: flex;
  align-items: center;
  margin-left: 0.25rem;
  padding-left: var(--space-md);
  border-left: 1px solid color-mix(in srgb, var(--color-outline-variant) 18%, transparent);
}

.nav__link--legal {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  color: color-mix(in srgb, var(--color-on-surface-variant) 92%, var(--color-primary));
}

.nav__link {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: -0.02em;
  color: var(--color-on-surface-variant);
  text-decoration: none;
  position: relative;
  padding: 0.35rem 0;
  transition: color var(--t-fast) ease;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-primary-container)
  );
  border-radius: 1px;
  transition: width var(--t-med) var(--ease-spring);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link:focus-visible::after {
  width: 100%;
}

.nav__link--cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-sm);
  color: var(--color-on-primary);
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-container) 100%
  );
  box-shadow: 0 2px 10px rgba(174, 42, 0, 0.2);
}

.nav__link--cta::after {
  display: none;
}

.nav__link--cta:hover,
.nav__link--cta:focus-visible {
  color: var(--color-on-primary);
  filter: brightness(1.06);
}

/* Gom mục phụ: Explore / Khám phá — header gọn hơn */
.nav-more {
  position: relative;
  z-index: 99;
  display: inline-block;
}

.nav-more__btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: -0.02em;
  color: var(--color-on-surface-variant);
  padding: 0.35rem 0.15rem 0.35rem 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  transition: color var(--t-fast) ease;
}

.nav-more__btn::-webkit-details-marker {
  display: none;
}

.nav-more__btn::marker {
  content: "";
}

.nav-more__btn::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 3px solid transparent;
  border-right: 3px solid transparent;
  border-top: 4px solid currentColor;
  opacity: 0.55;
  transition: transform var(--t-fast) var(--ease-spring);
}

.nav-more__btn:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--color-primary) 45%, transparent);
  outline-offset: 3px;
}

.nav-more:hover .nav-more__btn,
.nav-more[open] > .nav-more__btn {
  color: var(--color-primary);
}

.nav-more[open] > .nav-more__btn::after {
  transform: rotate(180deg);
}

.nav-more__panel {
  position: absolute;
  top: calc(100% + 0.35rem);
  left: 0;
  min-width: 208px;
  background: var(--color-surface-lowest);
  border: 1px solid var(--color-surface-high);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 36px rgba(11, 11, 13, 0.12);
  padding-block: 0.35rem;
  z-index: 200;
  pointer-events: auto;
}

.nav-more__item {
  display: flex;
  align-items: center;
  padding: 0.55rem 1rem;
  color: var(--color-on-surface-variant);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.875rem;
  transition:
    background var(--t-fast) ease,
    color var(--t-fast) ease;
}

.nav-more__item:hover,
.nav-more__item:focus-visible {
  background: var(--color-surface-low);
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 22px;
  background: var(--color-on-surface);
  margin-inline: auto;
  transition:
    background var(--t-fast) ease,
    transform var(--t-fast) var(--ease-spring),
    opacity var(--t-fast) ease;
}

.nav-toggle:hover span {
  background: var(--color-primary);
}

.nav-toggle:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--color-primary) 50%, transparent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md);
    background: var(--color-surface-lowest);
    box-shadow: var(--shadow-float);
    display: none;
  }

  .nav.is-open {
    display: flex;
  }

  .nav__legal {
    margin-left: 0;
    padding-left: 0;
    padding-top: var(--space-sm);
    margin-top: var(--space-xs);
    border-left: none;
    border-top: 1px solid color-mix(in srgb, var(--color-outline-variant) 15%, transparent);
  }

  .nav-more {
    width: 100%;
  }

  .nav-more__btn {
    width: 100%;
    justify-content: space-between;
    padding: 0.55rem 0;
    border-bottom: 1px solid color-mix(in srgb, var(--color-outline-variant) 12%, transparent);
  }

  .nav-more__panel {
    position: static;
    width: 100%;
    margin: 0.2rem 0 0.35rem;
    padding-block: 0.25rem;
    box-shadow: none;
    border: 1px solid color-mix(in srgb, var(--color-outline-variant) 12%, transparent);
    background: var(--color-surface-low);
    border-radius: var(--radius-sm);
  }

  .nav__link--cta {
    text-align: center;
    justify-content: center;
  }
}

/* —— Language switch (<details>) — tránh lỗi click do JS/Lenis; luôn bấm được link —— */
.lang-switch {
  position: relative;
  z-index: 100;
  display: inline-block;
  margin-left: 1.5rem;
}

.lang-switch__btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  background: color-mix(in srgb, var(--color-on-surface) 4%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-on-surface) 10%, transparent);
  color: var(--color-on-surface-variant);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8125rem;
  cursor: pointer;
  transition:
    background var(--t-fast) ease,
    border-color var(--t-fast) ease,
    color var(--t-fast) ease;
}

.lang-switch__btn::-webkit-details-marker {
  display: none;
}

.lang-switch__btn::marker {
  content: "";
}

.lang-switch__btn::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 3px solid transparent;
  border-right: 3px solid transparent;
  border-top: 4px solid currentColor;
  opacity: 0.6;
  transition: transform var(--t-fast) var(--ease-spring);
}

.lang-switch[open] > .lang-switch__btn {
  background: var(--color-surface-high);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lang-switch[open] > .lang-switch__btn::after {
  transform: rotate(180deg);
}

.lang-switch__panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 160px;
  background: var(--color-surface-lowest);
  border: 1px solid var(--color-surface-high);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 48px rgba(11, 11, 13, 0.14);
  padding-block: 0.4rem;
  z-index: 200;
  pointer-events: auto;
}

.lang-switch__item {
  display: flex;
  align-items: center;
  padding: 0.6rem 1rem;
  color: var(--color-on-surface-variant);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.875rem;
  transition:
    background var(--t-fast) ease,
    color var(--t-fast) ease;
}

.lang-switch__item:hover {
  background: var(--color-surface-low);
  color: var(--color-primary);
}

.lang-switch__item--active {
  color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 8%, transparent);
  font-weight: 700;
}

.doc-header-nav .lang-switch {
  margin-left: 0;
}

@media (max-width: 768px) {
  .lang-switch {
    margin-left: 0;
    margin-top: var(--space-sm);
    width: 100%;
  }

  .lang-switch__btn {
    width: 100%;
    justify-content: space-between;
  }

  .lang-switch__panel {
    position: static;
    width: 100%;
    margin-top: 0.35rem;
    box-shadow: var(--shadow-float);
  }
}

/* Không gộp .site-header: rule z-index:1 chung sẽ ghi đè sticky z-index:50 và main sẽ đè dropdown. */
main,
.site-footer {
  position: relative;
  z-index: 1;
}

/* Hero full viewport (trừ header): màn đầu không lộ section xám phía dưới */
.hero {
  padding-block: var(--space-xl);
}

.hero--viewport {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: calc(100dvh - var(--site-header-h));
  min-height: calc(100svh - var(--site-header-h));
  padding-block: clamp(0.75rem, 2vh, 1.25rem) 0;
}

.hero__shell {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(var(--space-md), 3vh, var(--space-xl));
  min-height: 0;
}

.hero__stats {
  flex-shrink: 0;
  width: 100%;
  padding-top: clamp(var(--space-sm), 2vh, var(--space-md));
  padding-bottom: var(--space-md);
}

/* Chuyển cảnh mượt từ nền hero sang section tonal (kiểu landing hiện đại) */
.hero__edge {
  flex-shrink: 0;
  height: clamp(3rem, 10vw, 5.5rem);
  width: 100%;
  cursor: default;
  background: linear-gradient(
    180deg,
    transparent 0%,
    color-mix(in srgb, var(--color-surface-low) 28%, transparent) 35%,
    var(--color-surface-low) 100%
  );
}

.section--after-hero {
  position: relative;
  padding-top: 0;
  margin-top: -1px;
}

.hero__grid {
  flex: 1 1 auto;
  align-content: center;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

@media (max-width: 900px) {
  .hero__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__visual {
    order: -1;
  }
}

.eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  margin: 0 0 var(--space-sm);
  transition: letter-spacing var(--t-med) var(--ease-spring), opacity var(--t-fast) ease;
}

.hero__content:hover .eyebrow {
  letter-spacing: 0.16em;
  opacity: 0.92;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 0 0 var(--space-md);
  color: var(--color-on-surface);
}

.hero__title-brand {
  display: inline-block;
  color: var(--color-primary);
  font-size: clamp(3.25rem, 9vw, 4.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.055em;
}

.hero__title-kicker {
  color: var(--color-on-surface);
}

.section__title-brand {
  color: var(--color-primary);
}

.hero__lead {
  margin: 0 0 var(--space-lg);
  max-width: 36rem;
  color: var(--color-on-surface-variant);
  font-size: 1.05rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 1.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition:
    transform var(--t-fast) var(--ease-spring),
    box-shadow var(--t-fast) var(--ease-spring),
    background var(--t-fast) ease,
    color var(--t-fast) ease,
    filter var(--t-fast) ease;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.btn:active:not([aria-disabled="true"]) {
  transform: translateY(0) scale(0.98);
}

.btn--primary {
  color: var(--color-on-primary);
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-container) 100%
  );
  box-shadow: var(--shadow-float);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 24px 48px rgba(11, 11, 13, 0.1);
}

.btn--secondary {
  color: var(--color-primary);
  background: var(--color-surface-highest);
}

.btn--secondary:hover {
  background: var(--color-surface-high);
  transform: translateY(-1px);
  box-shadow: var(--shadow-float);
}

.btn--tertiary {
  color: var(--color-on-surface-variant);
  background: transparent;
  position: relative;
}

.btn--tertiary::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: default;
  transition: border-color 0.2s ease;
}

.btn--tertiary:hover {
  color: var(--color-primary);
}

.btn--tertiary:hover::before {
  border-color: color-mix(in srgb, var(--color-primary) 35%, transparent);
}

.hero-card {
  position: relative;
  margin-inline: auto;
  max-width: 320px;
  padding: var(--space-xl) var(--space-lg);
  background: var(--color-surface-lowest);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-float);
  text-align: center;
  transition:
    box-shadow var(--t-med) var(--ease-spring),
    filter var(--t-med) ease;
}

.hero-card:hover {
  box-shadow: var(--shadow-hover-soft);
  filter: brightness(1.02);
}

.hero-card:hover .hero-card__brackets {
  opacity: 1;
}

.hero-card__brackets {
  position: absolute;
  inset: 12px;
  cursor: default;
  background:
    linear-gradient(var(--color-primary), var(--color-primary)) top left / 20px 2px no-repeat,
    linear-gradient(var(--color-primary), var(--color-primary)) top left / 2px 20px no-repeat,
    linear-gradient(var(--color-primary), var(--color-primary)) bottom right / 20px 2px no-repeat,
    linear-gradient(var(--color-primary), var(--color-primary)) bottom right / 2px 20px no-repeat;
  opacity: 0.85;
  transition: opacity var(--t-med) ease;
}

.hero-card__logo {
  display: block;
  margin-inline: auto;
  width: min(160px, 45vw);
  height: auto;
  transition: transform var(--t-med) var(--ease-spring);
}

.hero-card:hover .hero-card__logo {
  transform: scale(1.06);
}

.hero-card__caption {
  margin: var(--space-md) 0 0;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
  transition: color var(--t-fast) ease, letter-spacing var(--t-med) var(--ease-spring);
}

.hero-card:hover .hero-card__caption {
  color: var(--color-primary);
  letter-spacing: 0.08em;
}

.section {
  padding-block: var(--space-xl);
}

.section--tonal {
  background: var(--color-surface-low);
}

.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  letter-spacing: -0.04em;
  margin: 0 0 var(--space-sm);
}

.section__title--sm {
  font-size: clamp(1.5rem, 2.5vw, 1.85rem);
}

.split__col:hover .section__title--sm {
  color: var(--color-primary);
}

.split__col .section__title--sm {
  transition: color var(--t-med) ease;
}

.section__intro {
  margin: 0 0 var(--space-lg);
  max-width: 40rem;
  color: var(--color-on-surface-variant);
}

.section--preview .section__intro {
  margin-bottom: var(--space-md);
}

.section--preview {
  overflow: visible;
}

.preview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.52fr);
  gap: clamp(var(--space-lg), 4vw, var(--space-xl));
  /* start: căn đỉnh hai cột — center khiến cột thấp hơn “nổi” lên giữa hàng */
  align-items: start;
  margin-top: var(--space-xs);
  overflow: visible;
}

.preview-shot {
  margin: 0;
}

.preview-shot__label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin: 0 0 var(--space-sm);
}

/* Stage: ảnh giữ mặt phẳng; 3D chỉ ở tấm nền (::before) + bóng đất (::after) */
.preview-shot__stage {
  position: relative;
  perspective: 1600px;
  perspective-origin: 50% 40%;
  transform-style: preserve-3d;
  padding: 0.5rem 0.75rem 2.25rem;
  /* Cắt phần góc tấm nền xoay 3D lộ ra ngoài — tránh “tam giác trắng” lẫn với khung ảnh */
  overflow: hidden;
  border-radius: var(--radius-lg, 12px);
}

.preview-shot__stage::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 94%;
  height: 90%;
  z-index: 0;
  border-radius: var(--radius-md);
  pointer-events: none;
  transform: translate3d(-50%, -48%, 0) rotateX(14deg) rotateY(-11deg) translateZ(-72px);
  transform-origin: center center;
  /* Không dùng --color-surface-high ở góc — khi xoay 3D góc sáng trông như mảng trắng cạnh screenshot */
  background: linear-gradient(
    152deg,
    color-mix(in srgb, var(--color-primary) 22%, var(--color-surface-low)) 0%,
    var(--color-surface-low) 45%,
    color-mix(in srgb, var(--color-primary) 12%, var(--color-surface-low)) 100%
  );
  box-shadow:
    0 4px 0 rgba(255, 255, 255, 0.07) inset,
    0 28px 56px rgba(11, 11, 13, 0.14);
  transition: transform 0.75s var(--ease-spring), box-shadow 0.5s ease;
}

.preview-shot--mobile .preview-shot__stage::before {
  width: 78%;
  height: 82%;
  border-radius: clamp(1.25rem, 4vw, 2rem);
  transform: translate3d(-50%, -46%, 0) rotateX(13deg) rotateY(14deg) translateZ(-64px);
  box-shadow:
    0 3px 0 rgba(255, 255, 255, 0.06) inset,
    0 14px 28px rgba(11, 11, 13, 0.1);
}

.preview-shot__stage::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.5rem;
  width: min(78%, 480px);
  height: 32px;
  z-index: 1;
  transform: translateX(-50%) scaleY(0.42);
  background: radial-gradient(ellipse 55% 100% at 50% 50%, rgba(12, 12, 16, 0.26) 0%, transparent 70%);
  pointer-events: none;
}

.preview-shot--mobile .preview-shot__stage::after {
  /* Bóng đất sát máy, hẹp — tránh vệt đen loang rộng dưới mockup */
  width: min(52%, 150px);
  height: 12px;
  bottom: 0.85rem;
  transform: translateX(-50%) scaleY(0.38);
  background: radial-gradient(ellipse 48% 100% at 50% 50%, rgba(12, 12, 16, 0.16) 0%, transparent 78%);
}

.preview-shot:hover .preview-shot__stage::before {
  transform: translate3d(-50%, -48%, 0) rotateX(11deg) rotateY(-7deg) translateZ(-58px);
  box-shadow:
    0 4px 0 rgba(255, 255, 255, 0.08) inset,
    0 32px 64px rgba(11, 11, 13, 0.16);
}

.preview-shot--mobile:hover .preview-shot__stage::before {
  transform: translate3d(-50%, -46%, 0) rotateX(11deg) rotateY(10deg) translateZ(-52px);
  /* Không dùng bóng plate kiểu desktop (blur lớn) trên mobile */
  box-shadow:
    0 3px 0 rgba(255, 255, 255, 0.07) inset,
    0 12px 24px rgba(11, 11, 13, 0.11);
}

.preview-shot__frame {
  position: relative;
  z-index: 2;
  border-radius: var(--radius-md);
  overflow: hidden;
  transform: translateZ(10px);
  transform-style: preserve-3d;
  backface-visibility: hidden;
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 22%, transparent);
  background: var(--color-on-surface);
  line-height: 0;
  box-shadow:
    0 2px 0 rgba(255, 255, 255, 0.04) inset,
    0 10px 28px rgba(11, 11, 13, 0.12),
    0 28px 56px rgba(11, 11, 13, 0.14),
    0 48px 96px rgba(11, 11, 13, 0.08);
  transition: transform 0.65s var(--ease-spring), box-shadow 0.45s ease;
}

.preview-shot:hover .preview-shot__frame {
  transform: translateZ(18px);
  box-shadow:
    0 2px 0 rgba(255, 255, 255, 0.05) inset,
    0 16px 36px rgba(11, 11, 13, 0.14),
    0 36px 72px rgba(11, 11, 13, 0.16),
    0 56px 100px rgba(174, 42, 0, 0.06);
}

/* Ánh sáng góc trên màn hình */
.preview-shot__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.09) 0%,
    transparent 40%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 2;
}

.preview-shot__frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  display: block;
}

/* Viền / thân máy kiểu smartphone — bóng ngoài sát viền, bo theo border-radius */
.preview-shot__frame--phone {
  max-width: min(280px, 100%);
  margin-inline: auto;
  padding: 11px 11px 14px;
  overflow: hidden;
  border-radius: 2.4rem;
  background: linear-gradient(168deg, #3a3a3e 0%, #1c1c1f 38%, #0c0c0e 100%);
  border: 1px solid color-mix(in srgb, #fff 12%, #0a0a0c);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05) inset,
    0 2px 4px rgba(0, 0, 0, 0.45) inset,
    0 2px 4px rgba(11, 11, 13, 0.18),
    0 6px 14px rgba(11, 11, 13, 0.14),
    0 12px 22px rgba(11, 11, 13, 0.08);
}

.preview-shot__frame--phone::before {
  border-radius: inherit;
}

.preview-shot__frame--phone img {
  border-radius: 1.55rem;
}

/* Căn chỉnh chiều cao mobile = desktop: scale toàn khối — xem syncPreviewMobileScale() trong main.js */
.preview-shot--mobile {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.preview-shot--mobile .preview-shot__stage {
  transform-origin: top center;
}

.preview-shot:hover .preview-shot__frame--phone {
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.06) inset,
    0 2px 4px rgba(0, 0, 0, 0.45) inset,
    0 3px 8px rgba(11, 11, 13, 0.2),
    0 10px 22px rgba(11, 11, 13, 0.12),
    0 18px 32px rgba(174, 42, 0, 0.06);
}

@media (max-width: 960px) {
  .preview-grid {
    grid-template-columns: 1fr;
    max-width: 42rem;
    margin-inline: auto;
  }

  .preview-shot__stage::before {
    transform: translate3d(-50%, -48%, 0) rotateX(12deg) rotateY(-8deg) translateZ(-64px);
  }

  .preview-shot--mobile .preview-shot__stage::before {
    transform: translate3d(-50%, -46%, 0) rotateX(11deg) rotateY(11deg) translateZ(-56px);
  }

  .preview-shot__frame--phone {
    max-width: min(260px, 88vw);
  }
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

@media (max-width: 800px) {
  .feature-list {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition:
    transform var(--t-med) var(--ease-spring),
    box-shadow var(--t-med) var(--ease-spring),
    background-color var(--t-med) ease,
    border-color var(--t-med) ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover-soft);
  border-color: color-mix(in srgb, var(--color-primary) 18%, transparent);
}

.feature-card:hover .feature-card__title {
  color: var(--color-primary);
}

.feature-card--elevated {
  background: var(--color-surface-lowest);
  box-shadow: var(--shadow-float);
}

.feature-card--elevated:hover {
  background: var(--color-surface-lowest);
}

.feature-card__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--color-primary);
  letter-spacing: 0.08em;
}

.feature-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: var(--space-xs) 0 var(--space-sm);
  font-size: 1.125rem;
  transition: color var(--t-fast) ease;
}

.feature-card__text {
  margin: 0;
  color: var(--color-on-surface-variant);
  font-size: 0.9375rem;
}

.section--diagonal {
  background: var(--color-surface-lowest);
  clip-path: polygon(0 3%, 100% 0, 100% 100%, 0 97%);
  padding-block: calc(var(--space-xl) + 1rem);
  margin-block: var(--space-sm);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

@media (max-width: 800px) {
  .split {
    grid-template-columns: 1fr;
  }
}

.body-lg {
  font-size: 1.05rem;
  color: var(--color-on-surface-variant);
  margin: 0 0 var(--space-md);
}

.chip-row {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.chip {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--color-surface-high);
  color: var(--color-on-surface);
  border-radius: var(--radius-sm);
  cursor: default;
  transition:
    background var(--t-fast) ease,
    color var(--t-fast) ease,
    transform var(--t-fast) var(--ease-spring),
    box-shadow var(--t-fast) ease;
}

.chip:hover {
  background: color-mix(in srgb, var(--color-primary) 14%, var(--color-surface-high));
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(174, 42, 0, 0.12);
}

.panel-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.panel {
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  transition:
    transform var(--t-med) var(--ease-spring),
    box-shadow var(--t-med) var(--ease-spring),
    filter var(--t-med) ease;
}

.panel--outline {
  background: var(--color-surface-lowest);
  color: var(--color-on-surface);
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-float);
  transform: skewY(-1deg);
}

.panel--outline .panel__tag {
  color: var(--color-primary);
}

.panel--outline .panel__text {
  color: var(--color-on-surface-variant);
  opacity: 1;
}

.panel--outline:hover {
  transform: skewY(-1deg) translateY(-5px);
  box-shadow: var(--shadow-hover);
  background: color-mix(in srgb, var(--color-primary) 4%, var(--color-surface-lowest));
}

.panel--light {
  background: var(--color-surface-low);
  transform: skewY(-1deg);
}

.panel--light:hover {
  transform: skewY(-1deg) translateY(-5px);
  box-shadow: var(--shadow-hover-soft);
  background: var(--color-surface-high);
}

.panel__tag {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.9;
  margin-bottom: var(--space-xs);
}

.panel__tag--primary {
  color: var(--color-primary-container);
}

.panel--light .panel__tag {
  color: var(--color-primary);
}

.panel__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.5;
  opacity: 0.92;
}

.cta-block {
  padding-block: var(--space-xl);
}

.cta-block__inner {
  padding: var(--space-xl);
  background: var(--color-surface-low);
  border-radius: var(--radius-md);
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  border: 1px solid transparent;
  transition:
    transform var(--t-med) var(--ease-spring),
    box-shadow var(--t-med) var(--ease-spring),
    border-color var(--t-med) ease,
    background-color var(--t-med) ease;
}

.cta-block__inner:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover-soft);
  border-color: color-mix(in srgb, var(--color-outline-variant) 14%, transparent);
  background: color-mix(in srgb, var(--color-surface-lowest) 35%, var(--color-surface-low));
}

.cta-block__title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.04em;
  font-size: 1.75rem;
  margin: 0 0 var(--space-sm);
}

.cta-block__text {
  margin: 0 0 var(--space-lg);
  color: var(--color-on-surface-variant);
}

.cta-block__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.site-footer {
  padding-block: var(--space-lg);
  background: var(--color-surface-low);
  margin-top: var(--space-lg);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer-legal__link {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-on-surface-variant);
  text-decoration: none;
}

.footer-legal__link:hover {
  color: var(--color-primary);
}

.footer-legal__current {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-on-surface-variant);
  opacity: 0.85;
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.site-footer__note {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-on-surface-variant);
}

/* —— Hero: gợi ý nền tảng & chuyển động nhẹ —— */
.hero__platform-hint {
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  max-width: 36rem;
  margin: 0 0 var(--space-sm);
  line-height: 1.45;
}

.btn--soft {
  background: var(--color-surface-highest);
  color: var(--color-primary);
  box-shadow: none;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.btn--soft:hover {
  background: var(--color-surface-high);
  transform: translateY(-1px);
}

@keyframes hero-card-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.hero-card--motion {
  animation: hero-card-float 5.5s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .hero-card--motion {
    animation: none;
  }
}

/* —— Stats (nằm trong hero viewport) —— */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

@media (max-width: 768px) {
  .stats-row {
    grid-template-columns: 1fr;
  }
}

.stat-pill {
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface-lowest);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-float);
  text-align: center;
  border: 1px solid transparent;
  transition:
    transform var(--t-med) var(--ease-spring),
    box-shadow var(--t-med) var(--ease-spring),
    border-color var(--t-med) ease,
    background-color var(--t-med) ease;
}

.stat-pill:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover-soft);
  border-color: color-mix(in srgb, var(--color-primary) 22%, transparent);
  background: color-mix(in srgb, var(--color-surface-lowest) 88%, var(--color-surface-high));
}

.stat-pill__value {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  letter-spacing: -0.04em;
  color: var(--color-primary);
  line-height: 1.1;
  transition: transform var(--t-med) var(--ease-spring);
}

.stat-pill:hover .stat-pill__value {
  transform: scale(1.06);
}

.stat-pill__label {
  display: block;
  margin-top: var(--space-xs);
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  line-height: 1.4;
}

/* —— Steps (Cách hoạt động) —— */
.section--how {
  background: var(--color-surface-lowest);
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-md);
  max-width: 40rem;
}

.steps__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  align-items: start;
  padding: var(--space-md);
  background: var(--color-surface-low);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition:
    transform var(--t-med) var(--ease-spring),
    background-color var(--t-med) ease,
    border-color var(--t-med) ease,
    box-shadow var(--t-med) ease;
}

.steps__item:hover {
  transform: translateX(6px);
  background: var(--color-surface-high);
  border-color: color-mix(in srgb, var(--color-outline-variant) 12%, transparent);
  box-shadow: 0 12px 32px rgba(11, 11, 13, 0.05);
}

.steps__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-container) 100%
  );
  color: var(--color-on-primary);
  border-radius: var(--radius-sm);
  transition: transform var(--t-med) var(--ease-spring), box-shadow var(--t-med) ease;
}

.steps__item:hover .steps__num {
  transform: scale(1.1) rotate(-3deg);
  box-shadow: 0 10px 24px rgba(174, 42, 0, 0.25);
}

.steps__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  margin: 0 0 var(--space-xs);
  transition: color var(--t-fast) ease;
}

.steps__item:hover .steps__title {
  color: var(--color-primary);
}

.steps__text {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-on-surface-variant);
}

/* —— Tabs —— */
.section--tabs-wrap {
  background: var(--color-surface-low);
}

.tabs {
  max-width: 44rem;
  margin-inline: auto;
}

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.tabs__tab {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.55rem 1.1rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-surface-lowest);
  color: var(--color-on-surface-variant);
  cursor: pointer;
  transition:
    background var(--t-fast) ease,
    color var(--t-fast) ease,
    box-shadow var(--t-fast) var(--ease-spring),
    transform var(--t-fast) var(--ease-spring);
}

.tabs__tab:hover {
  color: var(--color-primary);
  background: var(--color-surface-high);
  transform: translateY(-2px);
}

.tabs__tab:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.tabs__tab[aria-selected="true"] {
  background: var(--color-on-surface);
  color: var(--color-surface-lowest);
  box-shadow: var(--shadow-float);
}

.tabs__tab[aria-selected="true"]:hover {
  transform: translateY(-2px);
  filter: brightness(1.12);
}

.tab-panel {
  padding: var(--space-lg);
  background: var(--color-surface-lowest);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-float);
  border: 1px solid transparent;
  transition:
    box-shadow var(--t-med) var(--ease-spring),
    border-color var(--t-med) ease,
    transform var(--t-med) var(--ease-spring);
}

.tab-panel:hover {
  box-shadow: var(--shadow-hover-soft);
  border-color: color-mix(in srgb, var(--color-primary) 12%, transparent);
  transform: translateY(-2px);
}

.tab-panel__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.03em;
  margin: 0 0 var(--space-sm);
}

.tab-panel__list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--color-on-surface-variant);
  font-size: 0.95rem;
  line-height: 1.55;
}

.tab-panel__list li + li {
  margin-top: 0.35rem;
}

/* —— Download grid —— */
.section--download {
  padding-bottom: var(--space-xl);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

@media (max-width: 900px) {
  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .download-grid {
    grid-template-columns: 1fr;
  }
}

.dl-card {
  position: relative;
  padding: var(--space-lg);
  background: var(--color-surface-lowest);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-float);
  border: 1px solid transparent;
  transition:
    transform var(--t-med) var(--ease-spring),
    box-shadow var(--t-med) var(--ease-spring),
    border-color var(--t-med) ease;
}

.dl-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover-soft);
  border-color: color-mix(in srgb, var(--color-primary) 25%, transparent);
}

.dl-card:hover .dl-card__title {
  color: var(--color-primary);
}

.dl-card:hover .dl-card__badge {
  transform: scale(1.05);
}

.dl-card--suggested {
  outline: 2px solid color-mix(in srgb, var(--color-primary) 45%, transparent);
  outline-offset: 2px;
}

.dl-card__badge {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  font-family: var(--font-display);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.25rem 0.5rem;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-container) 100%
  );
  color: var(--color-on-primary);
  border-radius: var(--radius-sm);
  transition: transform var(--t-fast) var(--ease-spring);
}

.dl-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  margin: 0 0 var(--space-xs);
  transition: color var(--t-fast) ease;
}

.dl-card__hint {
  margin: 0 0 var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  line-height: 1.4;
  min-height: 2.6em;
}

.dl-card__btn {
  width: 100%;
  min-height: 44px;
  font-size: 0.875rem;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.dl-card__btn--soon {
  background: var(--color-surface-highest);
  color: var(--color-on-surface-variant);
  box-shadow: none;
}

.dl-card__btn--soon:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-float);
  color: var(--color-primary);
  background: var(--color-surface-lowest);
}

.download-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.download-cta-row .btn {
  transition:
    transform var(--t-fast) var(--ease-spring),
    box-shadow var(--t-fast) var(--ease-spring);
}

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

.section__intro code {
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  background: var(--color-surface-high);
  border-radius: 3px;
  transition:
    background var(--t-fast) ease,
    color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.section__intro code:hover {
  background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface-high));
  color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(174, 42, 0, 0.12);
  cursor: default;
}

/* —— FAQ —— */
.faq {
  max-width: 40rem;
  margin-inline: auto;
}

.faq__item {
  background: var(--color-surface-lowest);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-float);
  margin-bottom: var(--space-sm);
  overflow: hidden;
  border: 1px solid transparent;
  transition:
    transform var(--t-med) var(--ease-spring),
    box-shadow var(--t-med) var(--ease-spring),
    border-color var(--t-med) ease;
}

.faq__item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover-soft);
  border-color: color-mix(in srgb, var(--color-outline-variant) 14%, transparent);
}

.faq__summary {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 2.5rem;
  transition: background var(--t-fast) ease, color var(--t-fast) ease;
}

.faq__item:hover .faq__summary {
  background: color-mix(in srgb, var(--color-primary) 7%, var(--color-surface-lowest));
  color: var(--color-on-surface);
}

.faq__item[open]:hover {
  border-color: color-mix(in srgb, var(--color-primary) 22%, transparent);
}

.faq__summary::-webkit-details-marker {
  display: none;
}

.faq__summary::after {
  content: "";
  position: absolute;
  right: var(--space-md);
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: translateY(-60%) rotate(45deg);
  transition: transform 0.2s ease;
}

.faq__item[open] .faq__summary::after {
  transform: translateY(-30%) rotate(225deg);
}

.faq__answer {
  margin: 0;
  padding: 0 var(--space-lg);
  font-size: 0.9375rem;
  color: var(--color-on-surface-variant);
  line-height: 1.55;
}

.faq__answer + .faq__answer {
  padding-top: 0.65rem;
}

.faq__item .faq__answer:last-of-type {
  padding-bottom: var(--space-md);
}

.faq__answer strong {
  color: var(--color-on-surface);
}

.faq__answer a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
}

.faq__answer a:hover {
  text-decoration: underline;
}

.section--closing {
  padding-top: 0;
}

.cta-block--wide .cta-block__inner {
  max-width: 720px;
}

/* —— Footer mở rộng —— */
.site-footer--mega {
  padding-block: var(--space-xl) var(--space-md);
  margin-top: 0;
  background: var(--color-surface-low);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid color-mix(in srgb, var(--color-outline-variant) 12%, transparent);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 520px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 var(--space-sm);
  transition: opacity var(--t-fast) ease;
}

.footer-brand:hover {
  opacity: 0.9;
}

.footer-brand img {
  transition: transform var(--t-med) var(--ease-spring);
  border-radius: var(--radius-sm);
}

.footer-brand:hover img {
  transform: scale(1.08) rotate(-2deg);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.04em;
  transition: color var(--t-fast) ease;
}

.footer-brand:hover .footer-brand__name {
  color: var(--color-primary);
}

.footer-brand__tag {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-on-surface-variant);
  max-width: 16rem;
  line-height: 1.45;
}

.footer-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-on-surface);
  margin: 0 0 var(--space-sm);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li + li {
  margin-top: 0.5rem;
}

.footer-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-on-surface-variant);
  text-decoration: none;
  display: inline-block;
  transition:
    color var(--t-fast) ease,
    transform var(--t-fast) var(--ease-spring);
}

.footer-links a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.footer-links a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

.footer-links a.footer-mail {
  color: var(--color-primary);
}

.footer-bottom {
  padding-top: var(--space-md);
}

.footer-copy {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  line-height: 1.5;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem 0.65rem;
  text-align: center;
}

.footer-copy__sep {
  color: color-mix(in srgb, var(--color-outline-variant) 45%, transparent);
}

.footer-mail {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--t-fast) ease, opacity var(--t-fast) ease;
}

.footer-mail:hover {
  color: var(--color-primary-container);
  text-decoration: underline;
}

.footer-mail:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

.footer-mail--inline {
  font-weight: 600;
}

main > section {
  scroll-margin-top: 5.5rem;
}

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

  .btn--primary:hover,
  .btn--soft:hover,
  .btn--secondary:hover,
  .download-cta-row .btn:hover {
    transform: none;
  }

  .btn:active:not([aria-disabled="true"]) {
    transform: none;
  }

  .brand:hover .brand__logo,
  .footer-brand:hover img {
    transform: none;
  }

  .hero__content:hover .eyebrow {
    letter-spacing: 0.12em;
  }

  .hero-card:hover .hero-card__logo {
    transform: none;
  }

  .hero-card:hover .hero-card__caption {
    letter-spacing: 0.06em;
  }

  .stat-pill:hover,
  .stat-pill:hover .stat-pill__value,
  .steps__item:hover,
  .steps__item:hover .steps__num,
  .feature-card:hover,
  .chip:hover,
  .panel--outline:hover,
  .panel--light:hover,
  .cta-block__inner:hover,
  .tab-panel:hover,
  .tabs__tab:hover,
  .tabs__tab[aria-selected="true"]:hover {
    transform: none;
    filter: none;
  }

  .faq__item:hover,
  .footer-links a:hover,
  .dl-card:hover,
  .dl-card:hover .dl-card__badge {
    transform: none;
  }

  .preview-shot__frame,
  .preview-shot:hover .preview-shot__frame {
    transform: none !important;
    box-shadow: var(--shadow-float);
  }

  .preview-shot__stage::before,
  .preview-shot:hover .preview-shot__stage::before,
  .preview-shot--mobile:hover .preview-shot__stage::before {
    transform: translate3d(-50%, -50%, 0) !important;
    box-shadow: 0 12px 28px rgba(11, 11, 13, 0.1);
  }
}

/* —— Trang Privacy (docs/index.html), cùng hệ thống —— */
.page-privacy .doc-main {
  padding-block: var(--space-xl);
}

.doc-hero {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.doc-hero__eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin: 0 0 var(--space-xs);
}

.doc-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  letter-spacing: -0.04em;
  margin: 0;
  color: var(--color-on-surface);
}

.doc-hero__meta {
  margin: var(--space-sm) 0 0;
  font-size: 0.9rem;
  color: var(--color-on-surface-variant);
}

.doc-prose {
  max-width: 44rem;
  margin-inline: auto;
  padding: var(--space-lg) var(--space-md);
  background: var(--color-surface-lowest);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-float);
}

.doc-prose > *:first-child {
  margin-top: 0;
}

.doc-prose h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.03em;
  margin: var(--space-lg) 0 var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid color-mix(in srgb, var(--color-outline-variant) 12%, transparent);
  color: var(--color-on-surface);
}

.doc-prose h2:first-of-type {
  border-top: none;
  padding-top: 0;
}

.doc-prose h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  margin: var(--space-md) 0 var(--space-xs);
  color: var(--color-on-surface);
}

.doc-prose h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  margin: var(--space-md) 0 var(--space-xs);
  color: var(--color-on-surface);
}

.doc-prose p,
.doc-prose li {
  color: var(--color-on-surface-variant);
  font-size: 0.95rem;
}

.doc-prose ul {
  padding-left: 1.25rem;
}

.doc-prose code {
  font-size: 0.88em;
  padding: 0.12em 0.35em;
  background: var(--color-surface-low);
  border-radius: 3px;
  color: var(--color-on-surface);
}

.doc-callout {
  background: var(--color-surface-low);
  padding: var(--space-md);
  margin: var(--space-md) 0;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary);
}

.doc-callout strong {
  color: var(--color-on-surface);
}

.doc-callout p:last-child,
.doc-callout ul:last-child {
  margin-bottom: 0;
}

.doc-callout p:first-child {
  margin-top: 0;
}

.site-header__inner--doc {
  justify-content: flex-start;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.doc-header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-left: auto;
  overflow: visible;
  flex-wrap: wrap;
}

.doc-header-nav__current {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
}

.doc-header-nav__link {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--color-primary);
  text-decoration: none;
}

.doc-header-nav__link:hover {
  text-decoration: underline;
}

@media (max-width: 560px) {
  .site-footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .doc-header-nav {
    margin-left: 0;
    width: 100%;
    justify-content: space-between;
  }
}

.page-privacy .doc-header-nav__current {
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-on-surface);
  opacity: 0.45;
  user-select: none;
}