/* ======================================================
   VF8 PLUS DETAIL PAGE CSS
   File CSS riêng cho vf8.html.
   Tất cả class đều có tiền tố vf8- để không ảnh hưởng index.html/vf3.html.
====================================================== */

:root {
  --vf8-blue: #0b7cff;
  --vf8-blue-dark: #075fcc;
  --vf8-blue-soft: #eaf4ff;

  --vf8-green: #12b76a;
  --vf8-green-dark: #079455;
  --vf8-green-soft: #ecfdf3;

  --vf8-black: #101828;
  --vf8-dark: #1d2939;
  --vf8-gray: #667085;
  --vf8-light-gray: #f2f4f7;
  --vf8-border: #e4e7ec;
  --vf8-white: #ffffff;

  --vf8-shadow: 0 20px 60px rgba(16, 24, 40, 0.1);
  --vf8-shadow-soft: 0 12px 32px rgba(16, 24, 40, 0.06);

  --vf8-radius-xl: 32px;
  --vf8-radius-lg: 24px;
  --vf8-radius-md: 18px;

  --vf8-container: 1120px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  color: var(--vf8-black);
  background: var(--vf8-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

button {
  font: inherit;
}

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

.vf8-container {
  width: min(100% - 32px, var(--vf8-container));
  margin: 0 auto;
}

.vf8-section {
  padding: 80px 0;
}

.vf8-section-soft {
  background: linear-gradient(180deg, #ffffff 0%, #f6faff 100%);
}

.vf8-section-heading {
  max-width: 760px;
  margin: 0 auto 42px;
  text-align: center;
}

.vf8-section-heading h2 {
  font-size: clamp(1.9rem, 5vw, 3rem);
  line-height: 1.12;
  letter-spacing: -1.5px;
  margin-bottom: 14px;
}

.vf8-section-heading p {
  color: var(--vf8-gray);
}

.vf8-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--vf8-blue-dark);
  background: var(--vf8-blue-soft);
  font-size: 0.9rem;
  font-weight: 700;
}

.vf8-eyebrow-light {
  color: var(--vf8-white);
  background: rgba(255, 255, 255, 0.14);
}

.vf8-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: 800;
  transition: 0.25s ease;
  white-space: nowrap;
  text-align: center;
}

.vf8-btn-primary {
  color: var(--vf8-white);
  background: linear-gradient(135deg, var(--vf8-blue), var(--vf8-green));
  box-shadow: 0 14px 30px rgba(11, 124, 255, 0.25);
}

.vf8-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 38px rgba(11, 124, 255, 0.34);
}

.vf8-btn-outline {
  color: var(--vf8-black);
  background: var(--vf8-white);
  border: 1px solid var(--vf8-border);
}

.vf8-btn-outline:hover {
  color: var(--vf8-blue);
  border-color: var(--vf8-blue);
  transform: translateY(-2px);
}

.vf8-btn-blue {
  color: var(--vf8-white);
  background: var(--vf8-blue);
}

.vf8-btn-zalo {
  color: var(--vf8-white);
  background: #0068ff;
}

.vf8-btn-fb {
  color: var(--vf8-white);
  background: #7c3aed;
}

.vf8-header {
  position: sticky;
  top: 0;
  z-index: 99;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(228, 231, 236, 0.85);
}

.vf8-nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.vf8-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.08rem;
  font-weight: 900;
  letter-spacing: -0.6px;
}

.vf8-logo-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 15px;
  color: var(--vf8-white);
  background: linear-gradient(135deg, var(--vf8-blue), var(--vf8-green));
  box-shadow: 0 12px 24px rgba(11, 124, 255, 0.22);
  font-size: 0.85rem;
}

.vf8-menu {
  display: none;
  align-items: center;
  gap: 20px;
  color: var(--vf8-gray);
  font-weight: 700;
  font-size: 0.95rem;
}

.vf8-menu a:hover {
  color: var(--vf8-blue);
}

.vf8-menu-cta {
  padding: 10px 16px;
  border-radius: 999px;
  color: var(--vf8-white) !important;
  background: var(--vf8-blue);
  box-shadow: 0 10px 24px rgba(11, 124, 255, 0.22);
}

.vf8-menu-toggle {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--vf8-border);
  border-radius: 14px;
  background: var(--vf8-white);
  cursor: pointer;
  font-size: 1.3rem;
}

.vf8-hero {
  padding: 64px 0 78px;
  background:
    radial-gradient(circle at top left, rgba(11, 124, 255, 0.16), transparent 32%),
    radial-gradient(circle at bottom right, rgba(18, 183, 106, 0.15), transparent 35%),
    linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
  overflow: hidden;
}

.vf8-hero-grid {
  display: grid;
  gap: 38px;
  align-items: center;
}

.vf8-hero-content h1 {
  max-width: 780px;
  margin-bottom: 18px;
  font-size: clamp(2.35rem, 9vw, 4.9rem);
  line-height: 0.98;
  letter-spacing: -3px;
}

.vf8-hero-content h1 span {
  color: var(--vf8-blue);
}

.vf8-hero-desc {
  max-width: 690px;
  margin-bottom: 26px;
  color: var(--vf8-gray);
  font-size: 1.06rem;
}

.vf8-hero-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.vf8-quick-list {
  display: grid;
  gap: 12px;
}

.vf8-quick-list div {
  padding: 14px;
  border: 1px solid var(--vf8-border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 8px 24px rgba(16, 24, 40, 0.04);
}

.vf8-quick-list strong {
  display: block;
  color: var(--vf8-black);
}

.vf8-quick-list span {
  display: block;
  color: var(--vf8-gray);
  font-size: 0.88rem;
}

.vf8-hero-card {
  position: relative;
  padding: 18px;
  border-radius: 36px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--vf8-border);
  box-shadow: var(--vf8-shadow);
}

.vf8-hero-card img {
  width: 100%;
  min-height: 330px;
  object-fit: cover;
  border-radius: 28px;
}

.vf8-image-placeholder {
  min-height: 330px;
  display: grid;
  place-items: center;
  text-align: center;
  border-radius: 28px;
  color: var(--vf8-white);
  background:
    linear-gradient(135deg, rgba(16, 24, 40, 0.92), rgba(11, 124, 255, 0.72)),
    repeating-linear-gradient(
      45deg,
      rgba(255,255,255,0.08),
      rgba(255,255,255,0.08) 10px,
      transparent 10px,
      transparent 20px
    );
}

.vf8-image-placeholder strong {
  display: block;
  font-size: clamp(3rem, 16vw, 6rem);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -3px;
}

.vf8-image-placeholder p {
  margin-top: 12px;
  opacity: 0.85;
}

.vf8-badge {
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 22px;
  padding: 13px 15px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--vf8-black);
  font-weight: 800;
  box-shadow: 0 10px 28px rgba(16, 24, 40, 0.16);
}

.vf8-specs {
  margin-top: -30px;
  position: relative;
  z-index: 2;
}

.vf8-specs-grid {
  display: grid;
  gap: 14px;
}

.vf8-spec-card {
  padding: 22px;
  border-radius: var(--vf8-radius-lg);
  background: var(--vf8-white);
  border: 1px solid var(--vf8-border);
  box-shadow: var(--vf8-shadow-soft);
  text-align: center;
}

.vf8-spec-card.spec-highlight {
  border-color: rgba(18, 183, 106, 0.34);
  background: linear-gradient(180deg, #ffffff, var(--vf8-green-soft));
}

.vf8-spec-card.price-spec {
  border-color: rgba(11, 124, 255, 0.34);
  background: linear-gradient(180deg, #ffffff, var(--vf8-blue-soft));
}

.vf8-quick-list .price-chip {
  border-color: rgba(11, 124, 255, 0.28);
  background: linear-gradient(180deg, #ffffff, var(--vf8-blue-soft));
}

.vf8-quick-list .price-chip strong {
  color: var(--vf8-blue);
}

.vf8-spec-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  margin: 0 auto 12px;
  border-radius: 18px;
  background: var(--vf8-blue-soft);
  font-size: 1.7rem;
}

.vf8-spec-card p {
  color: var(--vf8-gray);
  font-weight: 700;
  font-size: 0.92rem;
}

.vf8-spec-card h3 {
  margin-top: 4px;
  font-size: 1.15rem;
}

.vf8-feature-grid {
  display: grid;
  gap: 18px;
}

.vf8-feature-card {
  padding: 26px;
  border-radius: var(--vf8-radius-lg);
  background: var(--vf8-white);
  border: 1px solid var(--vf8-border);
  box-shadow: var(--vf8-shadow-soft);
  transition: 0.25s ease;
}

.vf8-feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(11, 124, 255, 0.35);
  box-shadow: 0 18px 44px rgba(16, 24, 40, 0.1);
}

.vf8-feature-card.feature-main {
  background:
    radial-gradient(circle at top right, rgba(18, 183, 106, 0.16), transparent 34%),
    linear-gradient(180deg, #ffffff, #f6fbff);
  border-color: rgba(11, 124, 255, 0.26);
}

.vf8-feature-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--vf8-blue-soft), var(--vf8-green-soft));
  font-size: 1.6rem;
}

.vf8-feature-card h3 {
  margin-bottom: 8px;
  font-size: 1.22rem;
  letter-spacing: -0.5px;
}

.vf8-feature-card p {
  color: var(--vf8-gray);
}

.vf8-compare-wrap {
  display: grid;
  gap: 24px;
  align-items: center;
}

.vf8-compare-text h2 {
  margin-bottom: 14px;
  font-size: clamp(1.9rem, 5vw, 3rem);
  line-height: 1.12;
  letter-spacing: -1.5px;
}

.vf8-compare-text p {
  color: var(--vf8-gray);
  margin-bottom: 22px;
}

.vf8-compare-card {
  padding: 18px;
  border-radius: var(--vf8-radius-xl);
  background: var(--vf8-white);
  border: 1px solid var(--vf8-border);
  box-shadow: var(--vf8-shadow-soft);
}

.vf8-compare-row {
  display: grid;
  gap: 8px;
  padding: 16px;
  border-bottom: 1px solid var(--vf8-border);
}

.vf8-compare-row:last-child {
  border-bottom: 0;
}

.vf8-compare-row span {
  color: var(--vf8-gray);
}

.vf8-compare-row strong {
  color: var(--vf8-blue);
  font-size: 1.05rem;
}

.vf8-guide-grid {
  display: grid;
  gap: 18px;
}

.vf8-guide-card {
  overflow: hidden;
  border-radius: var(--vf8-radius-lg);
  background: var(--vf8-white);
  border: 1px solid var(--vf8-border);
  box-shadow: var(--vf8-shadow-soft);
  transition: 0.25s ease;
}

.vf8-guide-card:hover {
  transform: translateY(-4px);
  border-color: rgba(11, 124, 255, 0.28);
  box-shadow: 0 18px 44px rgba(11, 124, 255, 0.12);
}

.vf8-video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(16, 24, 40, 0.92), rgba(11, 124, 255, 0.58)),
    repeating-linear-gradient(
      45deg,
      rgba(255,255,255,0.07),
      rgba(255,255,255,0.07) 10px,
      transparent 10px,
      transparent 20px
    );
}

.vf8-video-frame::before {
  content: "Gắn video hướng dẫn tại đây";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, 0.82);
  font-weight: 800;
  text-align: center;
  padding: 16px;
  z-index: 1;
  pointer-events: none;
}

.vf8-video-frame video,
.vf8-video-frame iframe {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  border: 0;
  object-fit: cover;
}

.vf8-guide-content {
  padding: 20px;
}

.vf8-guide-content span {
  display: inline-flex;
  margin-bottom: 10px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--vf8-blue-soft);
  color: var(--vf8-blue-dark);
  font-size: 0.78rem;
  font-weight: 800;
}

.vf8-guide-content h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
  letter-spacing: -0.4px;
}

.vf8-guide-content p {
  color: var(--vf8-gray);
  font-size: 0.95rem;
}

.vf8-policy-grid {
  display: grid;
  gap: 22px;
  align-items: start;
}

.vf8-policy-box,
.vf8-fee-box {
  padding: 28px;
  border-radius: var(--vf8-radius-xl);
  border: 1px solid var(--vf8-border);
  background: var(--vf8-white);
  box-shadow: var(--vf8-shadow-soft);
}

.vf8-policy-box h2,
.vf8-fee-box h2 {
  margin-bottom: 18px;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1.15;
  letter-spacing: -1px;
}

.vf8-check-list {
  display: grid;
  gap: 14px;
}

.vf8-check-list li {
  list-style: none;
  display: flex;
  gap: 10px;
  color: var(--vf8-gray);
}

.vf8-check-list li::before {
  content: "✓";
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--vf8-green);
  background: var(--vf8-green-soft);
  font-weight: 900;
}

.vf8-fee-list {
  display: grid;
  gap: 12px;
}

.vf8-fee-item {
  display: grid;
  gap: 8px;
  padding: 16px;
  border-radius: 18px;
  background: #f9fafb;
  border: 1px solid var(--vf8-border);
}

.vf8-fee-item.fee-highlight {
  background: var(--vf8-green-soft);
  border-color: rgba(18, 183, 106, 0.32);
}

.vf8-fee-item.price-fee {
  background: var(--vf8-blue-soft);
  border-color: rgba(11, 124, 255, 0.32);
}

.vf8-fee-item.price-fee strong {
  color: var(--vf8-blue);
}

.vf8-fee-item h3 {
  font-size: 1rem;
}

.vf8-fee-item p {
  color: var(--vf8-gray);
  font-size: 0.92rem;
}

.vf8-fee-item strong {
  color: var(--vf8-blue);
  font-size: 1.12rem;
  white-space: nowrap;
}

.vf8-contact-section {
  color: var(--vf8-white);
  background:
    radial-gradient(circle at top left, rgba(11, 124, 255, 0.34), transparent 35%),
    linear-gradient(135deg, #0b1220, #101828);
}

.vf8-contact-grid {
  display: grid;
  gap: 26px;
  align-items: center;
  padding: 72px 0;
}

.vf8-contact-grid h2 {
  max-width: 640px;
  margin-bottom: 14px;
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -2px;
}

.vf8-contact-grid p {
  color: rgba(255, 255, 255, 0.72);
}

.vf8-contact-card {
  padding: 24px;
  border-radius: var(--vf8-radius-xl);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(12px);
}

.vf8-contact-row {
  display: flex;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.vf8-contact-row span {
  font-size: 1.35rem;
}

.vf8-contact-row p {
  font-size: 0.9rem;
}

.vf8-contact-row strong {
  display: block;
  color: var(--vf8-white);
}

.vf8-contact-buttons {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.vf8-footer {
  padding: 20px 16px;
  text-align: center;
  color: rgba(255, 255, 255, 0.65);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.vf8-floating-contact {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 999;
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  gap: 12px;
}

.vf8-float-main,
.vf8-float-item {
  border: none;
  border-radius: 50%;
  color: var(--vf8-white);
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: 0 14px 30px rgba(16, 24, 40, 0.24);
}

.vf8-float-main {
  width: 62px;
  height: 62px;
  font-size: 1.45rem;
  background: linear-gradient(135deg, var(--vf8-blue), var(--vf8-green));
  animation: vf8Pulse 1.7s infinite, vf8Shake 2.8s infinite;
}

.vf8-floating-menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: 0.25s ease;
}

.vf8-floating-contact:hover .vf8-floating-menu,
.vf8-floating-contact.active .vf8-floating-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.vf8-float-item {
  position: relative;
  width: 50px;
  height: 50px;
  font-weight: 900;
  transition: 0.2s ease;
}

.vf8-float-item:hover {
  transform: translateY(-3px) scale(1.05);
}

.vf8-float-item span {
  position: absolute;
  right: 62px;
  padding: 7px 10px;
  border-radius: 999px;
  background: var(--vf8-black);
  color: var(--vf8-white);
  font-size: 0.78rem;
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
  transition: 0.2s ease;
}

.vf8-float-item:hover span {
  opacity: 1;
}

.vf8-call {
  background: var(--vf8-green);
}

.vf8-zalo,
.vf8-zalo2 {
  background: #0068ff;
}

.vf8-messenger {
  background: #7c3aed;
}

@keyframes vf8Pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(11, 124, 255, 0.45), 0 14px 30px rgba(16, 24, 40, 0.24);
  }

  70% {
    box-shadow: 0 0 0 18px rgba(11, 124, 255, 0), 0 14px 30px rgba(16, 24, 40, 0.24);
  }

  100% {
    box-shadow: 0 0 0 0 rgba(11, 124, 255, 0), 0 14px 30px rgba(16, 24, 40, 0.24);
  }
}

@keyframes vf8Shake {
  0%, 82%, 100% {
    transform: rotate(0deg);
  }

  85% {
    transform: rotate(8deg);
  }

  88% {
    transform: rotate(-8deg);
  }

  91% {
    transform: rotate(6deg);
  }

  94% {
    transform: rotate(-6deg);
  }

  97% {
    transform: rotate(3deg);
  }
}

@media (min-width: 560px) {
  .vf8-hero-actions {
    flex-direction: row;
  }

  .vf8-quick-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .vf8-specs-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .vf8-contact-buttons {
    grid-template-columns: repeat(2, 1fr);
  }

  .vf8-compare-row {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 700px) {
  .vf8-guide-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .vf8-fee-item {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .vf8-menu {
    display: flex;
  }

  .vf8-menu-toggle {
    display: none;
  }

  .vf8-hero {
    padding: 92px 0 108px;
  }

  .vf8-hero-grid {
    grid-template-columns: 1.02fr 0.98fr;
    gap: 56px;
  }

  .vf8-specs-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .vf8-feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .vf8-feature-card.feature-main {
    grid-column: span 2;
  }

  .vf8-compare-wrap {
    grid-template-columns: 0.85fr 1.15fr;
  }

  .vf8-policy-grid {
    grid-template-columns: 0.85fr 1.15fr;
  }

  .vf8-contact-grid {
    grid-template-columns: 1fr 0.95fr;
  }
}

@media (max-width: 899px) {
  .vf8-menu {
    position: absolute;
    top: 74px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    border-radius: 20px;
    background: var(--vf8-white);
    border: 1px solid var(--vf8-border);
    box-shadow: var(--vf8-shadow);
  }

  .vf8-menu.active {
    display: flex;
  }

  .vf8-menu a {
    padding: 12px;
    border-radius: 12px;
  }

  .vf8-menu a:hover {
    background: var(--vf8-blue-soft);
  }

  .vf8-menu-cta {
    text-align: center;
    margin-top: 8px;
  }
}

@media (max-width: 420px) {
  .vf8-container {
    width: min(100% - 24px, var(--vf8-container));
  }

  .vf8-section {
    padding: 64px 0;
  }

  .vf8-hero-content h1 {
    letter-spacing: -2px;
  }

  .vf8-btn {
    width: 100%;
  }

  .vf8-badge {
    left: 14px;
    right: 14px;
    bottom: 14px;
    font-size: 0.86rem;
  }

  .vf8-float-item span {
    display: none;
  }
}