:root {
  --brand: #ff7f00;
  --brand-dark: #e86f00;
  --brand-light: #fff4e8;
  --black: #08070d;
  --black-soft: #12101e;
  --white: #ffffff;
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-display: "Outfit", system-ui, sans-serif;
  --max-w: 72rem;
  --radius: 1rem;
  --radius-lg: 1.5rem;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.12);

  /* Redesign additions */
  --obsidian: #08070d;
  --accent: #ffb703;
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-bg-hover: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.07);
  --glass-border-hover: rgba(255, 127, 0, 0.25);
  --glass-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  --glow: 0 0 25px rgba(255, 127, 0, 0.15);
  --glow-strong: 0 0 35px rgba(255, 127, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--gray-700);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

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

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

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

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 1rem;
}

@media (min-width: 768px) {
  .container {
    padding-inline: 1.5rem;
  }
}

/* Logo — nền đen trong file PNG */
.logo {
  display: inline-flex;
  align-items: center;
  line-height: 0;
}

.logo img {
  height: 2.25rem;
  width: auto;
}

.logo--lg img {
  height: auto;
  width: min(100%, 280px);
}

@media (min-width: 768px) {
  .logo img {
    height: 2.75rem;
  }
}

/* Site head — sticky promo + header */
.site-head {
  position: sticky;
  top: 0;
  z-index: 200;
}

/* Promo — giống calatha.com */
.promo-bar {
  background: linear-gradient(90deg, #dd0707, #f74200, #cc890c);
  background-size: 200% auto;
  animation: promo-shift 6s ease infinite;
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

@keyframes promo-shift {
  0%,
  100% {
    background-position: 0% center;
  }
  50% {
    background-position: 100% center;
  }
}

@keyframes pulse {
  50% {
    opacity: 0.45;
  }
}

.promo-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 2.5rem;
  max-width: 80rem;
  margin-inline: auto;
  padding: 0 1rem;
}

.promo-bar__left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.promo-bar__dot {
  flex-shrink: 0;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #fff;
  animation: pulse 1.5s ease infinite;
}

.promo-bar__text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-style: italic;
}

.promo-bar__sep {
  display: none;
  opacity: 0.35;
}

.promo-bar__seller {
  display: none;
  align-items: center;
  gap: 0.375rem;
  color: rgba(255, 255, 255, 0.95);
  white-space: nowrap;
}

.promo-bar__seller:hover {
  color: #fff;
}

.promo-bar__locale {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  flex-shrink: 0;
  padding: 0.2rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.85);
  color: var(--gray-700);
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.promo-bar__flag {
  border-radius: 2px;
  object-fit: cover;
}

@media (min-width: 640px) {
  .promo-bar__sep,
  .promo-bar__seller {
    display: inline-flex;
  }
}

/* Header chính — Nền tối để logo nền đen tệp PNG chìm hoàn hảo */
.site-header {
  background: var(--obsidian);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: all 0.25s ease;
}

.site-header.is-scrolled {
  background: rgba(8, 7, 13, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header__main {
  display: flex;
  align-items: center;
  gap: 0.75rem 1rem;
  padding: 0.625rem 0;
}

.logo--header {
  flex-shrink: 0;
  padding: 0.25rem 0.5rem;
  background: transparent; /* Loại bỏ hộp nền đen xấu xí, hòa lẫn mượt mà vào header */
  border-radius: 0.5rem;
}

.logo--header img {
  height: 2.25rem;
  width: auto;
}

@media (min-width: 768px) {
  .logo--header img {
    height: 2.625rem;
  }
}

.header-search {
  display: none;
  flex: 1;
  align-items: center;
  gap: 0.75rem;
  max-width: 32rem;
  height: 2.75rem;
  padding: 0 1.125rem;
  font-size: 0.875rem;
  color: var(--gray-500);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 9999px;
  transition: border-color 0.2s, background 0.2s;
}

.header-search:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 127, 0, 0.45);
  color: #fff;
}

.header-search__icon {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
  color: var(--gray-400);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  margin-left: auto;
}

.site-header__sub {
  display: none;
  padding-bottom: 0.625rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-desktop {
  display: flex;
  gap: 1.5rem;
}

.nav-desktop a {
  font-size: 0.8125rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.75);
  transition: color 0.2s;
}

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

@media (min-width: 900px) {
  .header-search {
    display: flex;
  }

  .site-header__sub {
    display: block;
  }

  .site-header__main {
    padding: 0.75rem 0 0.5rem;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 9999px;
  border: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.15s;
}

.btn:active {
  transform: scale(0.98);
}

.btn--ghost {
  color: rgba(255, 255, 255, 0.85);
  background: transparent;
}

.btn--ghost:hover {
  color: #fff;
}

.btn--ghost-dark {
  display: none;
  color: rgba(255, 255, 255, 0.85);
  background: transparent;
}

.btn--ghost-dark:hover {
  color: var(--brand);
}

.btn--soft {
  display: none;
  color: var(--brand);
  background: rgba(255, 127, 0, 0.1);
  border: 1px solid rgba(255, 127, 0, 0.2);
}

.btn--soft:hover {
  background: rgba(255, 127, 0, 0.2);
  color: #fff;
}

.btn--primary {
  color: var(--black);
  background: var(--brand);
}

.btn--primary:hover {
  background: #ff9533;
}

.btn--block {
  width: 100%;
  margin-top: 0.5rem;
}

@media (min-width: 768px) {
  .btn--ghost-dark,
  .btn--soft {
    display: inline-flex;
  }

  .site-header__actions .btn--primary {
    padding-inline: 1.25rem;
  }
}

@media (max-width: 767px) {
  .site-header__actions .btn--primary {
    display: none;
  }
}

.btn--lg {
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
}

.btn--white {
  color: var(--black);
  background: #fff;
}

.btn--white:hover {
  background: var(--brand-light);
}

.btn--outline {
  color: #fff;
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.35);
}

.btn--outline:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.menu-toggle {
  display: flex;
  padding: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 0.5rem;
  color: #fff;
  cursor: pointer;
}

.menu-toggle svg {
  width: 1.375rem;
  height: 1.375rem;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 0.125rem;
  padding: 0.5rem 1rem 1rem;
  background: var(--obsidian);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

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

.nav-mobile a {
  padding: 0.625rem 0;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
}

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

.nav-mobile .btn--primary {
  color: var(--black);
}

@media (min-width: 900px) {
  .menu-toggle,
  .nav-mobile {
    display: none !important;
  }
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 4rem 0 6rem;
  background: var(--obsidian);
  color: #fff;
  /* Modern technology grid background */
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 50px 50px;
  background-position: center top;
}

/* Glowing orbs background */
.hero::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -5%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 127, 0, 0.18) 0%, rgba(255, 127, 0, 0) 75%);
  filter: blur(80px);
  pointer-events: none;
  animation: float-slow 12s ease-in-out infinite;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -15%;
  left: -5%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 111, 0, 0.12) 0%, rgba(232, 111, 0, 0) 75%);
  filter: blur(80px);
  pointer-events: none;
  animation: float-slow-reverse 15s ease-in-out infinite;
}

@keyframes float-slow {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-30px, 40px) scale(1.1);
  }
}

@keyframes float-slow-reverse {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(40px, -20px) scale(0.9);
  }
}

.hero__content {
  position: relative;
  display: grid;
  gap: 3rem;
  align-items: center;
  z-index: 10;
}

@media (min-width: 900px) {
  .hero {
    padding: 6rem 0 8rem;
  }

  .hero__content {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
  }
}

.hero__tag {
  display: inline-block;
  margin-bottom: 1.25rem;
  padding: 0.45rem 1.125rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--brand);
  background: rgba(255, 127, 0, 0.08);
  border: 1px solid rgba(255, 127, 0, 0.25);
  border-radius: 9999px;
  box-shadow: 0 0 15px rgba(255, 127, 0, 0.05);
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 3.875rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: #fff;
}

.hero h1 span {
  color: var(--brand);
  background: linear-gradient(135deg, var(--brand) 0%, #ffaa00 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero__subtitle {
  margin: 1rem 0 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  font-family: var(--font-display);
}

.hero__lead {
  margin: 1rem 0 0;
  max-width: 32rem;
  font-size: 1.0625rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.25rem;
}

.hero__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.75rem;
  margin-top: 2.25rem;
  padding: 0;
}

.hero__list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.75);
}

.hero__list svg {
  width: 1.125rem;
  height: 1.125rem;
  color: var(--brand);
  flex-shrink: 0;
}

/* Custom CSS Dashboard Mockup (Hero Panel replacement) */
.hero__dashboard {
  position: relative;
  padding: 2.25rem;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

.hero__dashboard:hover {
  border-color: var(--glass-border-hover);
  box-shadow: 0 30px 60px rgba(255, 127, 0, 0.12), var(--glass-shadow);
  transform: translateY(-4px);
}

.hero__dashboard::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--brand), transparent);
}

.dash-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.dash-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dash-status {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  font-size: 0.6875rem;
  font-weight: 700;
  color: #4ade80;
  background: rgba(74, 222, 128, 0.1);
  border-radius: 9999px;
  border: 1px solid rgba(74, 222, 128, 0.2);
}

.dash-status-dot {
  width: 6px;
  height: 6px;
  background-color: #4ade80;
  border-radius: 50%;
  box-shadow: 0 0 8px #4ade80;
  animation: pulse-green 1.5s infinite;
}

@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(74, 222, 128, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(74, 222, 128, 0); }
}

.dash-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.dash-stat-card {
  padding: 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius);
}

.dash-stat-label {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-bottom: 0.25rem;
}

.dash-stat-val {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.dash-stat-val.orange {
  color: var(--brand);
}

.dash-stat-trend {
  font-size: 0.6875rem;
  font-weight: 600;
  color: #4ade80;
}

.dash-chart {
  position: relative;
  height: 80px;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: flex-end;
}

.dash-chart-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.dash-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.dash-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.625rem 0.75rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 0.5rem;
  border-left: 3px solid var(--brand);
  font-size: 0.75rem;
}

.dash-item-info {
  display: flex;
  flex-direction: column;
}

.dash-item-title {
  font-weight: 600;
  color: #fff;
}

.dash-item-sub {
  color: var(--gray-500);
}

.dash-item-price {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--brand);
}

/* Trust */
.trust {
  padding: 2rem 0;
  background: var(--brand-light);
  border-bottom: 1px solid rgba(255, 127, 0, 0.15);
}

.trust__inner {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  text-align: center;
}

@media (min-width: 640px) {
  .trust__inner {
    grid-template-columns: repeat(4, 1fr);
  }
}

.trust__item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--brand-dark);
}

.trust__item span {
  font-size: 0.8125rem;
  color: var(--gray-500);
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section--gray {
  background: var(--gray-50);
}

.section__header {
  max-width: 36rem;
  margin: 0 auto 2.5rem;
  text-align: center;
}

.section__header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  color: var(--gray-800);
}

.section__header p {
  margin: 0.75rem 0 0;
  color: var(--gray-500);
  font-size: 0.9375rem;
}

.features {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .features {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .features {
    grid-template-columns: repeat(4, 1fr);
  }
}

.feature {
  padding: 2.25rem 2rem;
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.04);
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.section--gray .feature {
  background: #ffffff;
}

.feature::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(255, 127, 0, 0.04) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.4s;
}

.feature:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 127, 0, 0.25);
  box-shadow: 0 20px 40px rgba(255, 127, 0, 0.08);
}

.feature:hover::after {
  opacity: 1;
}

.feature__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 1rem;
  background: var(--brand-light);
  color: var(--brand-dark);
  margin-bottom: 1.25rem;
  transition: transform 0.3s, background-color 0.3s, color 0.3s, box-shadow 0.3s;
}

.feature:hover .feature__icon {
  transform: scale(1.1) rotate(5deg);
  background: var(--brand);
  color: var(--black);
  box-shadow: 0 8px 20px rgba(255, 127, 0, 0.2);
}

.feature__icon svg {
  width: 1.375rem;
  height: 1.375rem;
}

.feature h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--gray-800);
}

.feature p {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* Personas */
.personas {
  display: grid;
  gap: 2rem;
}

@media (min-width: 768px) {
  .personas {
    grid-template-columns: 1fr 1fr;
  }
}

.persona {
  padding: 3rem 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0, 0, 0, 0.06);
  background: #fff;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
}

.persona:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.08);
}

.persona--buyer {
  border-top: 4px solid var(--brand);
}

.persona--buyer:hover {
  border-color: var(--brand);
  box-shadow: 0 30px 60px rgba(255, 127, 0, 0.08);
}

.persona--shop {
  border-top: 4px solid var(--gray-800);
  background: linear-gradient(180deg, #ffffff 0%, #fafafa 100%);
}

.persona--shop:hover {
  border-color: var(--gray-800);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.1);
}

.persona__badge {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-dark);
  padding: 0.25rem 0.75rem;
  background: var(--brand-light);
  border-radius: 9999px;
  display: inline-block;
}

.persona--shop .persona__badge {
  color: var(--gray-700);
  background: var(--gray-100);
}

.persona h3 {
  margin: 1.25rem 0 0;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--gray-800);
}

.persona > p {
  margin: 0.5rem 0 0;
  font-size: 0.9375rem;
  color: var(--gray-500);
  line-height: 1.6;
}

.persona ul {
  margin-top: 1.5rem;
}

.persona li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--gray-700);
}

.persona li svg {
  flex-shrink: 0;
  width: 1.125rem;
  height: 1.125rem;
  color: var(--brand);
}

.persona--shop li svg {
  color: var(--gray-800);
}

.persona__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--brand-dark);
  transition: gap 0.2s, color 0.2s;
}

.persona--shop .persona__link {
  color: var(--gray-800);
}

.persona__link:hover {
  color: var(--brand);
  gap: 0.75rem;
}

.persona--shop .persona__link:hover {
  color: var(--brand-dark);
}

/* Smartphone CSS Mockup & About Layout */
.about-grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 900px) {
  .about-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.about-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.phone-mockup {
  position: relative;
  width: 290px;
  height: 580px;
  background: #1e1e24;
  border: 12px solid #2d2d35;
  border-radius: 40px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}

/* Phone screen content */
.phone-screen {
  width: 100%;
  height: 100%;
  background: #f8f9fa;
  display: flex;
  flex-direction: column;
  position: relative;
}

.phone-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 20px;
  background: #2d2d35;
  border-bottom-left-radius: 14px;
  border-bottom-right-radius: 14px;
  z-index: 10;
}

.phone-header {
  padding: 1.75rem 1rem 0.75rem;
  background: var(--black);
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.phone-logo {
  height: 18px;
  width: auto;
}

.phone-search-bar {
  margin: 0.75rem 1rem;
  padding: 0.5rem 1rem;
  background: #fff;
  border: 1px solid #e4e4e7;
  border-radius: 9999px;
  font-size: 0.75rem;
  color: var(--gray-400);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.phone-body {
  flex: 1;
  padding: 0.75rem 1rem;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.phone-banner {
  height: 100px;
  background: linear-gradient(135deg, var(--brand) 0%, #ff5500 100%);
  border-radius: 14px;
  padding: 0.875rem;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 12px rgba(255, 127, 0, 0.15);
}

.phone-banner-title {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 800;
}

.phone-banner-sub {
  font-size: 0.625rem;
  opacity: 0.9;
}

.phone-products-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
}

.phone-product-card {
  background: #fff;
  border-radius: 10px;
  padding: 0.625rem;
  border: 1px solid rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.01);
}

.phone-product-img {
  height: 75px;
  background: var(--gray-100);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  color: var(--gray-400);
  font-weight: 600;
}

.phone-product-name {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--gray-800);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.phone-product-price {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand);
}

/* Floating screen elements */
.phone-badge-float {
  position: absolute;
  background: #fff;
  border-radius: 16px;
  padding: 0.75rem 1.125rem;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border: 1px solid rgba(0, 0, 0, 0.04);
  z-index: 20;
}

.phone-badge-float--1 {
  bottom: 80px;
  left: -40px;
  animation: float-badge 6s ease-in-out infinite;
}

.phone-badge-float--2 {
  top: 120px;
  right: -40px;
  animation: float-badge 6s ease-in-out infinite 3s;
}

@keyframes float-badge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.phone-badge-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
}

.phone-badge-text {
  display: flex;
  flex-direction: column;
}

.phone-badge-title {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--gray-800);
}

.phone-badge-sub {
  font-size: 0.625rem;
  color: var(--gray-500);
}

.about-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-info h3 {
  font-family: var(--font-display);
  font-size: clamp(1.375rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--gray-800);
  margin: 0;
}

.about-info p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--gray-700);
}

.about-features {
  display: grid;
  gap: 1rem;
  margin-top: 0.5rem;
}

.about-feat-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-800);
}

.about-feat-item svg {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--brand-dark);
  flex-shrink: 0;
}

/* Redesigned CTA Box */
.cta {
  padding: 5rem 0;
}

.cta__box {
  padding: 4rem 2rem;
  text-align: center;
  border-radius: 2rem;
  background: linear-gradient(135deg, #0b0a12 0%, #151126 100%);
  color: #fff;
  border: 1px solid rgba(255, 127, 0, 0.15);
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(255, 127, 0, 0.05);
}

.cta__box::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255, 127, 0, 0.15) 0%, transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}

.cta__box::after {
  content: "";
  position: absolute;
  bottom: -50%;
  right: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255, 127, 0, 0.1) 0%, transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}

.cta__box .logo {
  justify-content: center;
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 5;
}

.cta__box h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 5;
}

.cta__box > p {
  margin: 1rem auto 0;
  max-width: 32rem;
  font-size: 1.0625rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  position: relative;
  z-index: 5;
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem 2rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.875rem;
  font-weight: 600;
}

.contact-row a {
  color: var(--brand);
}

.contact-row a:hover {
  color: #fff;
}

/* Footer */
.footer {
  background: var(--gray-100);
  padding: 2.5rem 0 0;
}

.footer__top {
  display: grid;
  gap: 2rem;
  padding-bottom: 2rem;
}

@media (min-width: 768px) {
  .footer__top {
    grid-template-columns: 1.1fr 1.9fr;
  }
}

.footer__brand .logo {
  margin-bottom: 1rem;
}

.footer__brand > p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--gray-500);
  max-width: 20rem;
}

.footer__company {
  margin-top: 1.25rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--gray-500);
}

.footer__company strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--gray-800);
}

.footer__company .hotline {
  font-weight: 700;
  color: var(--brand-dark);
}

.footer__cols {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .footer__cols {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer__cols h4 {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--gray-800);
}

.footer__cols a {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.8125rem;
  color: var(--gray-500);
}

.footer__cols a:hover {
  color: var(--brand-dark);
}

.footer__bottom {
  padding: 1rem 0;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  text-align: center;
  font-size: 0.75rem;
  color: var(--gray-500);
}

.footer__bottom a {
  color: var(--brand-dark);
  font-weight: 600;
}

/* Scroll Animation Classes */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.21, 0.6, 0.35, 1), transform 0.8s cubic-bezier(0.21, 0.6, 0.35, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

/* FAQ Accordion */
.faq-accordion {
  max-width: 42rem;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.faq-item:hover {
  border-color: rgba(255, 127, 0, 0.25);
  box-shadow: 0 10px 30px rgba(255, 127, 0, 0.05);
}

.faq-trigger {
  width: 100%;
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  background: transparent;
  border: none;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-800);
  text-align: left;
  cursor: pointer;
}

.faq-icon {
  color: var(--gray-400);
  transition: transform 0.3s ease, color 0.3s;
  flex-shrink: 0;
}

.faq-trigger[aria-expanded="true"] .faq-icon {
  transform: rotate(180deg);
  color: var(--brand-dark);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-content-inner {
  padding: 0 1.5rem 1.5rem;
  font-size: 0.9375rem;
  color: var(--gray-500);
  line-height: 1.65;
  border-top: 1px solid rgba(0, 0, 0, 0.03);
}

.faq-content-inner p {
  margin: 0;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2.5rem;
  right: 2.5rem;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: rgba(8, 7, 13, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 127, 0, 0.25);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 199;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--brand);
  color: var(--black);
  border-color: var(--brand);
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 10px 25px rgba(255, 127, 0, 0.4);
}

/* Scrollspy Active Link State */
.nav-desktop a.active {
  color: var(--brand) !important;
  position: relative;
}

.nav-desktop a.active::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--brand);
  border-radius: 99px;
  animation: slide-in-line 0.3s forwards;
}

@keyframes slide-in-line {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}