:root {
  color-scheme: light;
  --page: #f7fafb;
  --paper: #fff;
  --ink: #00162f;
  --muted: #526579;
  --blue: #006caf;
  --green: #00796b;
  --primary-hover: #00665b;
  --line: #d7e6e4;
  --band: #e9f6f3;
  --display: #eef5f5;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --gutter: clamp(24px, 5vw, 72px);
  --content: 1440px;
  --body-size: 1rem;
  --small-size: .8125rem;
  --label-size: .75rem;
  --display-size: clamp(42px, 4.4vw, 64px);
  --control: 52px;
  --radius: 8px;
  --ease: 200ms cubic-bezier(0.16, 1, 0.3, 1);
  --danger: #c02b20;
  --border-strong: #74899d;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  background: #f4f7f9;
  color: var(--ink);
}

/* Document layout & stacking context */
body {
  margin: 0;
  font-size: var(--body-size);
  line-height: 1.6;
  background: transparent;
  position: relative;
  min-height: 100vh;
}
.site-header, #main, .site-footer {
  position: relative;
  z-index: 1;
}

/* Powerful Ambient Plasma & Cyber Wave Stage */
.ambient-stage {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  background: #f0f4f8;
}

.ambient-plasma {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  filter: contrast(110%);
}

.plasma-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  will-change: transform;
}

/* Orb 1: Vibrant Emerald/Mint - Top Left Energy Core */
.plasma-orb-1 {
  top: -15vw;
  left: 0vw;
  width: 65vw;
  height: 65vw;
  background: radial-gradient(circle, rgba(0, 220, 160, 0.48) 0%, rgba(0, 160, 130, 0.26) 38%, rgba(0, 121, 107, 0) 70%);
  filter: blur(60px);
  animation: plasmaFloat1 20s cubic-bezier(0.4, 0, 0.2, 1) infinite alternate;
}

/* Orb 2: Electric Cyan/Blue - Middle Right High-Velocity Core */
.plasma-orb-2 {
  top: 25vh;
  right: -12vw;
  width: 62vw;
  height: 62vw;
  background: radial-gradient(circle, rgba(0, 160, 255, 0.45) 0%, rgba(0, 110, 230, 0.24) 42%, rgba(0, 108, 175, 0) 72%);
  filter: blur(65px);
  animation: plasmaFloat2 24s cubic-bezier(0.4, 0, 0.2, 1) infinite alternate;
}

/* Orb 3: Radiant Golden Amber - Lower Left Warmth Accent */
.plasma-orb-3 {
  bottom: 0vh;
  left: 2vw;
  width: 54vw;
  height: 54vw;
  background: radial-gradient(circle, rgba(255, 170, 45, 0.38) 0%, rgba(240, 120, 30, 0.2) 42%, rgba(220, 145, 50, 0) 70%);
  filter: blur(55px);
  animation: plasmaFloat3 22s cubic-bezier(0.4, 0, 0.2, 1) infinite alternate;
}

/* Orb 4: Electric Indigo/Violet - Central Depth Core */
.plasma-orb-4 {
  top: 75vh;
  left: 30vw;
  width: 52vw;
  height: 52vw;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.38) 0%, rgba(124, 58, 237, 0.2) 45%, rgba(99, 102, 241, 0) 72%);
  filter: blur(65px);
  animation: plasmaFloat4 26s cubic-bezier(0.4, 0, 0.2, 1) infinite alternate;
}

/* Orb 5: Pure Neon Teal - Floating Focal Beacon */
.plasma-orb-5 {
  top: 48vh;
  left: 18vw;
  width: 36vw;
  height: 36vw;
  background: radial-gradient(circle, rgba(0, 245, 190, 0.42) 0%, rgba(0, 180, 160, 0.18) 50%, transparent 70%);
  filter: blur(45px);
  animation: plasmaFloat5 18s ease-in-out infinite alternate;
}

@keyframes plasmaFloat1 {
  0% { transform: translate3d(0, 0, 0) rotate(0deg) scale(1); }
  50% { transform: translate3d(60px, 70px, 0) rotate(25deg) scale(1.15); }
  100% { transform: translate3d(-40px, 45px, 0) rotate(-15deg) scale(0.92); }
}
@keyframes plasmaFloat2 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-70px, -60px, 0) scale(1.16); }
  100% { transform: translate3d(45px, -35px, 0) scale(0.9); }
}
@keyframes plasmaFloat3 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(55px, -55px, 0) scale(1.14); }
  100% { transform: translate3d(-50px, 35px, 0) scale(0.88); }
}
@keyframes plasmaFloat4 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-55px, 50px, 0) scale(1.18); }
  100% { transform: translate3d(50px, -40px, 0) scale(0.92); }
}
@keyframes plasmaFloat5 {
  0% { transform: translate3d(0, 0, 0) scale(0.95); }
  50% { transform: translate3d(70px, -40px, 0) scale(1.22); }
  100% { transform: translate3d(-30px, 60px, 0) scale(1); }
}

/* Ambient Canvas: High-FPS undulation wave ribbons & glowing star constellation */
.ambient-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
  z-index: 2;
}

/* Sharp Dot Matrix Cyber Grid Overlay */
.ambient-grid {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background-image: radial-gradient(rgba(0, 22, 47, 0.14) 1.5px, transparent 1.5px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 95% 85% at 50% 30%, black 50%, transparent 92%);
  -webkit-mask-image: radial-gradient(ellipse 95% 85% at 50% 30%, black 50%, transparent 92%);
  opacity: 0.85;
}

/* Dynamic Energy Sheen Sweep */
.ambient-sweep {
  position: absolute;
  inset: -100%;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(130deg, transparent 44%, rgba(0, 220, 160, 0.22) 48%, rgba(0, 160, 255, 0.35) 50%, rgba(255, 170, 45, 0.22) 52%, transparent 56%);
  transform: translate3d(-100%, -100%, 0) rotate(-18deg);
  animation: energySweep 11s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
  will-change: transform;
}
@keyframes energySweep {
  0% { transform: translate3d(-120%, -120%, 0) rotate(-18deg); opacity: 0; }
  15% { opacity: 1; }
  85% { opacity: 1; }
  100% { transform: translate3d(120%, 120%, 0) rotate(-18deg); opacity: 0; }
}

/* Scroll-triggered reveal */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1), transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal-on-scroll.is-revealed {
  opacity: 1;
  transform: translateY(0);
}
html:not(.js) .reveal-on-scroll {
  opacity: 1 !important;
  transform: none !important;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font-size: var(--body-size); line-height: 1.6; }
h1, p, figure, ul { margin: 0; }
p { text-wrap: pretty; }
a { color: inherit; text-decoration: none; -webkit-tap-highlight-color: transparent; }
a:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 5px;
}

.skip-link {
  position: fixed;
  top: var(--space-4);
  left: var(--gutter);
  z-index: 20;
  min-height: 44px;
  padding: var(--space-3) var(--space-6);
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: var(--space-8);
  max-width: var(--content);
  min-height: 96px;
  margin: auto;
  padding: var(--space-3) var(--gutter);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background var(--ease), box-shadow var(--ease), border-color var(--ease);
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 20px -2px rgba(0, 22, 47, 0.05);
}
.brand { display: block; flex: 0 0 auto; border-radius: var(--radius); }
.brand-crop { position: relative; display: block; width: 98px; height: 74px; overflow: hidden; }
.brand-crop img {
  position: absolute;
  width: 150px;
  height: 150px;
  max-width: none;
  left: -26px;
  top: -39px;
}
.site-header nav { margin-left: auto; font-size: var(--small-size); }
.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding-inline: var(--space-2);
  white-space: nowrap;
}
.nav-link:hover { color: var(--blue); }
.nav-link:active { color: var(--green); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.6fr);
  align-items: center;
  gap: var(--space-12);
  max-width: var(--content);
  margin: 24px auto 36px;
  padding: clamp(28px, 3.5vw, 48px) var(--gutter);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 22, 47, 0.05);
  border-radius: 24px;
  box-shadow: 0 10px 30px -6px rgba(0, 22, 47, 0.04);
}
.hero-copy { min-width: 0; padding-bottom: var(--space-8); }
h1 {
  font-size: var(--display-size);
  line-height: 1.02;
  font-weight: 600;
  letter-spacing: -.052em;
  text-wrap: balance;
}
h1 span { display: block; color: var(--blue); }
.hero-description {
  max-width: 27ch;
  margin-top: var(--space-6);
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--muted);
}
.button {
  display: inline-flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-8);
  min-height: var(--control);
  margin-top: var(--space-8);
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--green);
  border-radius: var(--radius);
  background: var(--green);
  color: var(--paper);
  font-size: var(--body-size);
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0, 121, 107, 0.2);
  transition: background var(--ease), border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}
.button:hover { background: var(--primary-hover, #00665b); border-color: var(--primary-hover, #00665b); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0, 121, 107, 0.32); }
.button:active { transform: translateY(0); background: var(--ink); border-color: var(--ink); box-shadow: 0 2px 4px rgba(0, 121, 107, 0.15); }
.product-display { min-width: 0; display: flex; flex-direction: column; }
.product-display .scene-stage {
  width: 100%;
  height: clamp(520px, 68svh, 700px);
  min-height: 440px;
  background: var(--display);
  border: 0;
  border-radius: var(--radius);
}
.product-display figcaption {
  padding: var(--space-3) var(--space-2) 0;
  color: var(--muted);
  font-size: var(--label-size);
}

@media (max-width: 1100px) {
  :root { --display-size: clamp(40px, 4.4vw, 52px); --gutter: 40px; }
  .hero { gap: var(--space-8); }
}

@media (max-width: 900px) {
  :root { --gutter: 24px; --display-size: 48px; }
  .site-header { min-height: 88px; gap: var(--space-4); padding-block: var(--space-2); }
  .hero { grid-template-columns: minmax(0, 1fr); gap: var(--space-6); padding-block: var(--space-8) var(--space-6); }
  .hero-copy { padding: 0; }
  h1 span { display: inline; }
  .hero-description { max-width: 44ch; margin-top: var(--space-4); font-size: var(--body-size); }
  .button { margin-top: var(--space-6); }
  .product-display { margin-inline: calc(var(--gutter) * -1); }
  .product-display .scene-stage { height: 440px; min-height: 340px; border-radius: 0; }
  .product-display figcaption { padding-inline: var(--gutter); }
}

@media (max-width: 440px) {
  :root { --gutter: 20px; --display-size: clamp(30px, 9.75vw, 44px); --control: 48px; }
  .hero { padding-top: var(--space-6); }
  .button { gap: var(--space-6); }
  .product-display .scene-stage { height: 360px; }
}

@media (max-width: 350px) {
  :root { --gutter: 16px; }
  .site-header { gap: var(--space-3); }
  .nav-link { padding-inline: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .button:hover { transform: none; }
  .ambient-orb { animation: none !important; opacity: 0.25 !important; }
  .reveal-on-scroll { opacity: 1 !important; transform: none !important; }
  .demo-dialog, .demo-dialog::backdrop { transform: none !important; }
}

html { scroll-padding-top: 24px; }
button { font: inherit; cursor: pointer; touch-action: manipulation; }
button:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
button:disabled { cursor: default; }
[hidden] { display: none !important; }
.scene-poster { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; object-fit: contain; pointer-events: none; background: var(--display); }
.scene-stage[data-ready="true"] .scene-poster, .scene-stage[data-ready="partial"] .scene-poster { visibility: hidden; }
body:has(.demo-dialog[open]) { overflow: hidden; }
.demo-dialog {
  width: min(1000px, calc(100% - 48px)); max-width: none;
  max-height: calc(100svh - 48px); padding: var(--space-6);
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--paper); color: var(--ink); overflow-y: auto;
  box-shadow: 0 24px 64px -12px rgba(0, 22, 47, 0.22), 0 0 0 1px rgba(0, 121, 107, 0.08);
  opacity: 0;
  transform: scale(0.96) translateY(12px);
  transition: opacity 260ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 260ms cubic-bezier(0.16, 1, 0.3, 1),
              overlay 260ms allow-discrete,
              display 260ms allow-discrete;
}
.demo-dialog[open] {
  opacity: 1;
  transform: scale(1) translateY(0);
}
@starting-style {
  .demo-dialog[open] {
    opacity: 0;
    transform: scale(0.96) translateY(12px);
  }
}
.demo-dialog::backdrop {
  background: rgba(0, 22, 47, 0.46);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity 260ms ease, backdrop-filter 260ms ease, overlay 260ms allow-discrete, display 260ms allow-discrete;
}
.demo-dialog[open]::backdrop {
  opacity: 1;
}
@starting-style {
  .demo-dialog[open]::backdrop {
    opacity: 0;
  }
}
.demo-heading { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-6); }
.demo-heading h2 { margin: 0; font-size: 26px; letter-spacing: -.03em; line-height: 1.2; text-wrap: balance; }
.demo-close { min-width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); color: var(--ink); font-size: 28px; line-height: 1; flex-shrink: 0; transition: background var(--ease), border-color var(--ease); }
.demo-close:hover { background: var(--band); border-color: var(--blue); }
.demo-workspace { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.demo-catalogue, .demo-cart { padding: var(--space-6); min-width: 0; }
.demo-catalogue { background: var(--page); }
.demo-toolbar { display: flex; justify-content: space-between; align-items: center; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-6); }
.category-buttons { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.category-buttons button { min-height: 44px; padding: var(--space-2) var(--space-3); border: 1px solid var(--line); border-radius: 6px; color: var(--muted); background: var(--paper); font-size: 13px; transition: border-color var(--ease), background var(--ease), color var(--ease); }
.category-buttons button[aria-pressed="true"] { color: white; background: var(--ink); border-color: var(--ink); }
.category-buttons button:hover { border-color: var(--blue); }
.demo-products { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
.demo-product { min-height: 120px; padding: var(--space-4); background: var(--paper); border: 1px solid var(--line); border-radius: 6px; color: var(--ink); text-align: left; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--space-2); transition: border-color var(--ease), transform 140ms ease, box-shadow var(--ease); }
.demo-product strong { grid-column: 1 / -1; font-size: 16px; font-weight: 600; text-wrap: balance; }
.demo-product span { color: var(--muted); font-size: 14px; align-self: center; font-variant-numeric: tabular-nums; }
.demo-product b { font-size: 22px; line-height: 1; font-weight: 400; align-self: center; }
.demo-product:hover { border-color: var(--green); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0, 22, 47, 0.06); }
.demo-product:active { background: var(--band); transform: scale(0.97); }
.demo-cart { display: flex; flex-direction: column; border-left: 1px solid var(--line); }
.cart-header { display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); border-bottom: 1px solid var(--line); padding-bottom: var(--space-3); }
.cart-header h3 { margin: 0; font-size: 18px; line-height: 1.3; }
.reset-button { min-height: 44px; padding: var(--space-2); border: 0; background: none; color: var(--muted); font-size: 13px; white-space: nowrap; }
.reset-button:hover:not(:disabled) { text-decoration: underline; color: var(--blue); }
.cart-lines { min-height: 155px; padding: var(--space-3) 0; }
.empty-cart { padding: var(--space-6) 0; color: var(--muted); font-size: 14px; }
@keyframes lineSlideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.cart-line { display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); padding: var(--space-3) 0; border-bottom: 1px solid var(--line); animation: lineSlideIn 200ms cubic-bezier(0.16, 1, 0.3, 1); }
.cart-line > div:first-child { min-width: 0; }
.cart-line strong { display: block; font-size: 14px; }
.cart-line > div:first-child span { display: block; font-size: 12px; color: var(--muted); }
.quantity-controls { display: flex; align-items: center; gap: 2px; flex: 0 0 auto; }
.quantity-controls button { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 5px; background: var(--page); color: var(--ink); font-size: 20px; transition: background var(--ease), border-color var(--ease); }
.quantity-controls button:hover { background: var(--band); border-color: var(--blue); }
.quantity-controls span { min-width: 22px; text-align: center; font-size: 13px; font-variant-numeric: tabular-nums; }
.cart-bottom { margin-top: auto; }
.cart-total { display: flex; justify-content: space-between; gap: var(--space-2); align-items: baseline; border-top: 1px solid var(--line); padding-top: var(--space-4); }
.cart-total span { font-size: 14px; }
.cart-total strong { font-size: 25px; letter-spacing: -.03em; font-variant-numeric: tabular-nums; transition: transform 200ms ease, color 200ms ease; }
@keyframes totalPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); color: var(--green); }
  100% { transform: scale(1); }
}
.cart-total.has-pulse strong {
  animation: totalPulse 240ms ease-out;
}
.cart-bottom .button { width: 100%; margin-top: var(--space-4); }
.button:disabled { background: var(--band); color: var(--muted); border-color: var(--line); transform: none; }
.demo-disclaimer { margin: var(--space-4) 0 0; font-size: 12px; color: var(--muted); }
.demo-status { min-height: 24px; margin-top: var(--space-2); font-size: 14px; color: var(--green); }
html:not(.js) .demo-dialog:target { display: block; position: static; margin: 32px auto; }
html:not(.js) .demo-close { display: none; }
@media (max-width: 700px) {
  .demo-dialog { width: calc(100% - 24px); max-height: calc(100svh - 24px); padding: var(--space-4); }
  .demo-heading h2 { font-size: 22px; }
  .demo-workspace { grid-template-columns: minmax(0, 1fr); }
  .demo-catalogue, .demo-cart { padding: var(--space-4); }
  .demo-cart { border-left: 0; border-top: 1px solid var(--line); }
  .demo-product { min-height: 105px; padding: var(--space-3); }
  .demo-product strong { font-size: 14px; }
  .cart-lines { min-height: 80px; }
}

/* Studio A extended into the product introduction and customer entry points. */
.site-header { position: sticky; top: 0; z-index: 10; gap: var(--space-6); }
#site-nav { display: flex; align-items: center; gap: var(--space-6); margin-left: auto; }
#site-nav a, .login-link, .logout-link { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink); font-size: 14px; white-space: nowrap; }
#site-nav a:hover, .login-link:hover, .logout-link:hover { color: var(--blue); }
.account-actions { display: flex; align-items: center; gap: 16px; }
.register-link { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 16px; border: 1px solid var(--ink); border-radius: 5px; font-size: 14px; white-space: nowrap; }
.register-link:hover { background: var(--ink); color: white; }
.logout-link { border: 0; background: none; padding: 8px 0; }
#account-link { max-width: 120px; overflow: hidden; text-overflow: ellipsis; }
.nav-toggle { display: none; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-top: var(--space-8); }
.hero-actions .button { margin: 0; }
.secondary-action { display: inline-flex; align-items: center; gap: 16px; min-height: 44px; color: var(--ink); font-size: 14px; font-weight: 600; }
.secondary-action:hover { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }
.content-section {
  max-width: var(--content);
  margin: 32px auto;
  padding: clamp(32px, 4vw, 56px) var(--gutter);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 22, 47, 0.05);
  border-radius: 24px;
  box-shadow: 0 10px 30px -6px rgba(0, 22, 47, 0.04);
  transition: border-color var(--ease), box-shadow var(--ease);
}
.content-section:hover {
  border-color: rgba(0, 121, 107, 0.22);
  box-shadow: 0 14px 36px -6px rgba(0, 22, 47, 0.06);
}
#tinh-nang { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.6fr); gap: var(--space-12); }
.section-intro { min-width: 0; }
h2 { margin: 0 0 20px; font-size: clamp(30px, 3vw, 42px); font-weight: 600; line-height: 1.12; letter-spacing: -.045em; text-wrap: balance; }
h3 { margin: 0 0 10px; font-size: 19px; line-height: 1.25; letter-spacing: -.02em; text-wrap: balance; }
.section-intro > p:last-child { color: var(--muted); max-width: 40ch; }
.features-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.features-grid article {
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}
.features-grid article:hover {
  transform: translateY(-3px);
  border-color: var(--green);
  box-shadow: 0 12px 28px -4px rgba(0, 22, 47, 0.08);
}
.features-grid p { color: var(--muted); font-size: 15px; }
.module-state { display: inline-flex; align-items: center; min-height: 24px; padding: 2px 8px; margin-bottom: 12px; border: 1px solid #a4b5c2; border-radius: 5px; color: var(--muted); font-size: 12px; line-height: 1.5; background: var(--band); }
.device-section {
  max-width: var(--content);
  margin: 32px auto;
  padding: clamp(32px, 4vw, 52px) var(--gutter);
  background: rgba(233, 246, 243, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 121, 107, 0.14);
  border-radius: 24px;
  box-shadow: 0 10px 30px -6px rgba(0, 22, 47, 0.04);
  min-width: 0;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.device-section:hover {
  border-color: rgba(0, 121, 107, 0.28);
  box-shadow: 0 14px 36px -6px rgba(0, 22, 47, 0.07);
}
.device-heading { display: flex; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; gap: var(--space-4); margin-bottom: var(--space-6); }
.device-heading h2 { margin: 0; }
.device-heading p { margin: var(--space-3) 0 0; color: var(--muted); }
.device-controls { display: flex; align-items: center; gap: var(--space-2); }
.device-controls[hidden] { display: none; }
.device-controls > span { margin-right: var(--space-2); font-size: var(--small-size); color: var(--muted); }
.device-arrow { width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); color: var(--ink); font: 22px/1 "Segoe UI",sans-serif; cursor: pointer; }
.device-arrow:hover:not(:disabled) { border-color: var(--blue); background: var(--display); }
.device-arrow:active:not(:disabled) { transform: translateY(1px); }
.device-arrow:disabled { opacity: .4; cursor: default; }
.device-list { list-style: none; padding: 4px 4px var(--space-4); margin: -4px -4px 0; display: flex; gap: var(--space-6); overflow-x: auto; scroll-snap-type: x mandatory; scroll-padding-inline: 4px; scroll-behavior: smooth; overscroll-behavior-x: contain; scrollbar-width: thin; scrollbar-color: var(--muted) var(--line); cursor: grab; }
.device-list li { min-width: 0; flex: 0 0 min(312px, 82%); scroll-snap-align: start; }
.device-list.is-dragging { cursor: grabbing; scroll-snap-type: none; scroll-behavior: auto; user-select: none; }
.device-list:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  .device-list { scroll-behavior: auto; }
}
.device-photo { margin: 0 0 var(--space-4); }
.device-photo img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: contain; border-radius: var(--radius); background: var(--display); }
.device-item-heading { display: flex; align-items: flex-start; align-content: flex-start; flex-wrap: wrap; column-gap: var(--space-2); row-gap: 4px; min-height: 48px; }
.device-list h3 { margin: 0; font-size: 18px; line-height: 1.4; }
.device-plan { display: inline-flex; align-items: center; min-height: 24px; padding: 2px 8px; border: 1px solid #a4b5c2; border-radius: 5px; color: var(--muted); font-size: var(--label-size); line-height: 1.5; }
.device-list p { margin: 0; font-size: 15px; color: var(--muted); }
.device-credits { min-width: 0; margin-top: var(--space-3); font-size: var(--small-size); color: var(--muted); }
.device-credits summary { display: flex; align-items: center; gap: var(--space-2); min-height: 44px; width: fit-content; cursor: pointer; color: var(--ink); list-style: none; }
.device-credits summary::-webkit-details-marker { display: none; }
.device-credits summary::after { content: '+'; font-size: 18px; }
.device-credits[open] summary::after { content: '−'; }
.device-credits p, .device-credits ul { margin: var(--space-2) 0 0; padding: 0; list-style: none; overflow-wrap: anywhere; }
.device-credits a { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.device-credits summary:hover, .device-credits a:hover { color: var(--blue); }
.consultation-band {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-8);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.85) 0%, rgba(233, 246, 243, 0.8) 100%);
  border: 1px solid rgba(0, 121, 107, 0.16);
  border-radius: 24px;
  box-shadow: 0 10px 30px -6px rgba(0, 121, 107, 0.06);
}
.consultation-band h2 { margin: 0; font-size: clamp(26px, 2.4vw, 36px); }
.consultation-band .button { flex: 0 0 auto; margin: 0; }
.contact-dialog { width: min(600px,calc(100% - 24px)); }
.contact-dialog .demo-heading { position: sticky; top: 0; z-index: 1; background: var(--paper); }
.contact-channels { margin-bottom: 16px; font-size: 14px; color: var(--muted); }
.contact-channels a { display: block; min-height: 44px; padding-block: 10px; overflow-wrap: anywhere; }
.contact-channels a:hover { color: var(--blue); }
.contact-form { max-width: 600px; }
.extra-details { margin-bottom: 16px; }
.extra-details summary { min-height: 44px; padding-block: 10px; cursor: pointer; font-size: 14px; color: var(--muted); }
.extra-details summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.extra-details[open] summary { margin-bottom: 12px; }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; margin-bottom: 7px; font-size: 14px; font-weight: 600; }
.form-field label span { color: var(--muted); font-size: 12px; font-weight: 400; }
.form-field input, .form-field select, .form-field textarea { display: block; width: 100%; min-height: 48px; padding: 12px; border: 1px solid var(--border-strong, #74899d); border-radius: 6px; background: var(--paper); color: var(--ink); font: 16px/1.4 "Segoe UI",sans-serif; transition: border-color var(--ease); }
.form-field textarea { resize: vertical; min-height: 100px; }
.form-field input::placeholder, .form-field textarea::placeholder { color: #526579; }
.form-field :is(input,select,textarea):focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.form-field [aria-invalid="true"] { border-color: var(--danger, #c02b20); }
.contact-form .button { margin-top: 2px; }
.form-note { color: var(--muted); font-size: 12px; margin-top: 14px; }
.field-error { color: var(--danger, #c02b20); font-size: 13px; margin-top: 7px; min-height: 20px; }
.quote-result { max-width: 600px; padding: 24px; background: var(--band); border: 1px solid var(--line); border-radius: var(--radius); margin-top: 24px; }
.quote-result:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
.quote-result > p { color: var(--muted); font-size: 14px; }
.quote-result pre { white-space: pre-wrap; overflow-wrap: anywhere; font: 14px/1.6 "Segoe UI",sans-serif; color: var(--ink); margin: 20px 0 12px; }
.quote-result .secondary-action { margin-right: 24px; }
.site-footer { max-width: var(--content); margin: auto; padding: 24px var(--gutter); display: flex; align-items: center; justify-content: space-between; gap: 28px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.site-footer a { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding-inline: 8px; }
.auth-dialog { width: min(440px,calc(100% - 24px)); }
.auth-intro { color: var(--muted); font-size: 15px; margin-bottom: 24px; }
#auth-form .button { width: 100%; margin-top: 0; justify-content: center; }
#auth-status { margin-bottom: 12px; }
.demo-fill { display: block; width: 100%; min-height: 44px; margin-top: 14px; padding: 10px; border: 1px solid var(--line); border-radius: 5px; background: var(--page); color: var(--ink); font-size: 14px; }
.demo-fill:hover { border-color: var(--blue); }
.auth-switch { margin-top: 20px; font-size: 14px; color: var(--muted); }
.auth-switch a { display: inline-flex; align-items: center; min-height: 44px; color: var(--blue); font-weight: 600; padding-inline: 8px; }
.account-dialog { width: min(600px,calc(100% - 24px)); }
#account-welcome { overflow-wrap: anywhere; }
.account-metrics { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); margin: 28px 0 0; gap: 24px; border-block: 1px solid var(--line); padding-block: 24px; }
.account-metrics dt { font-size: 13px; color: var(--muted); }
.account-metrics dd { font-size: 30px; margin: 8px 0 0; font-variant-numeric: tabular-nums; font-weight: 600; letter-spacing: -.04em; }
.account-dialog > .secondary-action { margin-left: 20px; }

@media (max-width: 1100px) {
  .site-header { gap: 16px; }
  #site-nav { gap: 16px; }
  #site-nav a { font-size: 13px; }
  .account-actions { gap: 12px; }
}
@media (max-width: 900px) {
  .site-header { display: grid; grid-template-columns: minmax(0,1fr) auto auto; gap: 8px; padding: 8px var(--gutter); }
  .site-header .brand { grid-column: 1; grid-row: 1; }
  .brand-crop { width: 80px; height: 64px; }
  .brand-crop img { width: 124px; height: 124px; left: -22px; top: -32px; }
  .account-actions { grid-column: 2; grid-row: 1; gap: 6px; }
  .account-actions a, .account-actions button { font-size: 12px; }
  .register-link { padding-inline: 10px; }
  .nav-toggle { display: block; grid-column: 3; grid-row: 1; min-width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 5px; background: white; color: var(--ink); font-size: 23px; }
  #site-nav { display: none; grid-column: 1/-1; grid-row: 2; width: 100%; margin: 0; padding-block: 8px; border-top: 1px solid var(--line); gap: 8px; }
  #site-nav.is-open { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
  #site-nav a { min-height: 44px; }
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-6);
    margin: 16px 12px 24px;
    padding: 24px 16px;
    border-radius: 20px;
  }
  .content-section, .device-section {
    margin: 24px 12px;
    padding: 28px 16px;
    border-radius: 20px;
  }
  #tinh-nang { grid-template-columns: 1fr; gap: 32px; }
  .consultation-band { align-items: flex-start; flex-direction: column; gap: 24px; }
  .section-intro > p:last-child { max-width: 58ch; }
  .contact-form, .quote-result { max-width: none; }
}
@media (max-width: 440px) {
  .site-header { gap: 6px; }
  .account-actions { gap: 5px; }
  .hero {
    margin: 12px 8px 20px;
    padding: 20px 14px;
    border-radius: 16px;
  }
  .content-section, .device-section {
    margin: 20px 8px;
    padding: 24px 14px;
    border-radius: 16px;
  }
  .hero-actions { gap: 10px 20px; margin-top: 24px; }
  .hero-actions .button { font-size: 15px; }
  .features-grid { grid-template-columns: 1fr; gap: 24px; }
  h2 { font-size: 32px; }
  .device-section { padding-block: 36px; }
  .device-list { gap: var(--space-4); }
  .account-dialog > .secondary-action { display: flex; margin: 14px 0 0; }
  .account-metrics { gap: 16px; }
  .account-metrics dd { font-size: 27px; }
  .site-footer { flex-wrap: wrap; gap: 10px 24px; }
}
@media (max-width: 350px) {
  .brand-crop { width: 72px; }
  .brand-crop img { width: 112px; height: 112px; left: -20px; top: -28px; }
  .register-link { padding-inline: 8px; }
  .site-header { gap: 5px; }
}
html:not(.js) #site-nav { display: flex; flex-wrap: wrap; }

html { scroll-padding-top: 116px; }

.about-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: start;
  gap: var(--space-12);
}
.about-photo { min-width: 0; }
.about-photo img { display: block; width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; border-radius: var(--radius); }
.about-copy { min-width: 0; }
.about-copy h2 { margin: 0 0 var(--space-6); text-wrap: balance; }
.about-copy > p { color: var(--muted); max-width: 60ch; }
.about-values { margin: var(--space-8) 0 0; padding: 0; list-style: none; }
.about-values > li { padding-block: var(--space-4); border-top: 1px solid var(--line); font-size: 1rem; font-weight: 650; line-height: 1.5; }
.about-planned { display: inline-block; margin-left: 4px; padding: 2px 8px; border-radius: 4px; background: var(--band); color: var(--green); font-size: var(--label-size); font-weight: 600; vertical-align: middle; }
.about-copy > .secondary-action { margin-top: var(--space-4); }
@media (max-width: 900px) {
  .about-section { grid-template-columns: minmax(0, 1fr); gap: var(--space-8); }
}