:root {
  --deep-green: #34513A;
  --soft-gold: #eb9500;
  --cream: #fbfaf8;
  --gray: #6c6c6c;
  --light-gray: #f5f5f5;
  --border-light: #e5e5e5;
  --white: #fff;
}

body {
  font-family: 'Montserrat', sans-serif;
  background: var(--cream);
  color: #333;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; transition: color 0.3s ease; }

/* --- Basic Layout & Nav --- */
nav{position:fixed;top:0;left:0;width:100%;background:rgba(251, 250, 248, 0.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);z-index:1000;padding:1.3rem 0;border-bottom:1px solid rgba(0,0,0,0.03);transition: all 0.3s ease;}
nav.scrolled{padding:0.9rem 0; box-shadow:0 4px 20px rgba(0,0,0,0.05);}
.nav-container{max-width:1300px;margin:0 auto;padding:0 2rem;display:flex;justify-content:space-between;align-items:center;}
.logo{font-family:'Playfair Display',serif;font-size:22px;color:var(--deep-green);letter-spacing:1px;}
.nav-links{display:flex;gap:2.5rem;}
.nav-links a{font-weight:500;font-size:12px;letter-spacing:1px;text-transform:uppercase;transition:color 0.3s;}
.nav-links a:hover {color: var(--soft-gold);}
.menu-toggle{display:none;}

.container { max-width: 900px; margin: 0 auto; padding: 120px 2rem 60px; }
.section-title { font-family: 'Playfair Display', serif; font-size: 48px; text-align: center; color: var(--deep-green); margin-bottom: 16px; font-weight: 700; }
.section-subtitle { text-align: center; font-size: 16px; color: var(--gray); max-width: 680px; margin: 0 auto 48px; line-height: 1.8; }
.gold-line { width: 60px; height: 2px; background: var(--soft-gold); margin: 28px auto 0; border-radius: 1px; }

/* --- Pricing Section --- */
.pricing-section {
  display: flex;
  flex-direction: column;
  gap: 60px;
  margin-top: 60px;
}

/* Base Package */
.base-package {
  background: var(--white);
  border-radius: 20px;
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(235, 149, 0, 0.2);
  overflow: hidden;
  text-align: center;
}

.package-header {
  padding: 40px 30px;
  background: linear-gradient(135deg, var(--deep-green), #2a4530);
  color: var(--white);
  position: relative;
}

.package-badge {
  display: inline-block;
  background: var(--soft-gold);
  color: var(--deep-green);
  padding: 6px 15px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 15px;
  text-transform: uppercase;
}

.package-title {
  font-family: 'Playfair Display', serif;
  font-size: 36px;
  font-weight: 700;
  margin: 0 0 10px;
}

.package-price {
  font-size: 44px;
  font-weight: 700;
  color: var(--soft-gold);
  margin: 0 0 10px;
  letter-spacing: -1px;
}

.package-subtitle {
  font-size: 16px;
  opacity: 0.8;
  margin: 0;
  font-weight: 300;
}

.package-body {
  padding: 40px 50px;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: left;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  font-size: 15px;
  color: var(--gray);
  flex-direction: column;
  gap: 5px;
}

.feature-icon {
  font-size: 24px;
  margin-right: 0;
  color: var(--soft-gold);
  width: 30px;
  text-align: center;
  margin-bottom: 5px;
}

.feature-list strong {
  color: var(--deep-green);
}

.feature-note {
  font-size: 13px;
  color: #999;
  font-weight: 400;
  font-style: italic;
  display: block;
}

.package-footer {
    padding: 0 50px 40px;
}

/* Upsell Section */
.upsell-section {
  margin-top: 0;
}

.upsell-title {
  text-align: center;
  font-family: 'Playfair Display', serif;
  font-size: 32px;
  color: var(--deep-green);
  margin-bottom: 10px;
}

.upsell-subtitle {
    text-align: center;
    font-size: 15px;
    color: var(--gray);
    margin-bottom: 40px;
}

.upsell-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.upsell-card {
  background: var(--white);
  border: 2px solid var(--border-light);
  border-radius: 16px;
  padding: 30px;
  text-align: center;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0,0,0,0.03);
  cursor: pointer;
  position: relative;
}

.upsell-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  border-color: rgba(235, 149, 0, 0.4);
}

.upsell-card.active {
  border: 2px solid var(--soft-gold);
  background: linear-gradient(135deg, rgba(235, 149, 0, 0.03), rgba(235, 149, 0, 0.01));
  box-shadow: 0 12px 35px rgba(235, 149, 0, 0.25);
  transform: translateY(-8px) scale(1.02);
}

.upsell-card.active:hover {
  box-shadow: 0 15px 40px rgba(235, 149, 0, 0.35);
}

.upsell-card .checkmark {
  display: none;
  position: absolute;
  top: 12px;
  right: 12px;
  background-color: var(--soft-gold);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  text-align: center;
  line-height: 28px;
  font-weight: bold;
  font-size: 18px;
  z-index: 2;
  transform: scale(0);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 4px 12px rgba(235, 149, 0, 0.4);
}

.upsell-card.active .checkmark {
  display: block;
  transform: scale(1);
}

@keyframes popIn {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.upsell-icon {
  font-size: 32px;
  color: var(--soft-gold);
  margin-bottom: 15px;
}

.upsell-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--deep-green);
  margin: 0 0 10px;
}

.upsell-description {
  font-size: 14px;
  color: var(--gray);
  margin: 0 0 15px;
  line-height: 1.6;
  min-height: 44px; /* Ensures cards have same height */
}

.upsell-price {
  font-size: 20px;
  font-weight: 700;
  color: var(--soft-gold);
  margin: 0;
}

/* Total Section */
.total-section {
    background: var(--white);
    border-radius: 16px;
    padding: 40px 50px;
    margin-top: 60px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.07);
    border: 1px solid var(--border-light);
}

.total-line {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
    padding: 12px 0;
}

.total-line span:first-child {
    color: var(--gray);
}

.total-line span:last-child {
    font-weight: 600;
    color: var(--deep-green);
}

.upgrade-item {
    animation: fadeIn 0.5s ease;
    font-size: 14px;
    color: var(--gray);
    padding: 8px 0;
}

.selected-list {
    min-height: 20px;
    margin-bottom: 10px;
}

.total-divider {
    height: 1px;
    background: var(--border-light);
    margin: 15px 0;
}

.final-total {
    padding-top: 15px;
}

.final-total span:first-child {
    font-size: 20px;
    font-weight: 700;
    color: var(--deep-green);
}

.final-total span:last-child {
    font-family: 'Playfair Display', serif;
    font-size: 40px;
    font-weight: 700;
    color: var(--soft-gold);
}

.cta-section {
    text-align: center;
    margin-top: 40px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
}

/* Buttons and Links */
.btn { 
  display: inline-block;
  padding: 16px 42px; 
  border-radius: 10px; 
  font-weight: 600; 
  letter-spacing: 0.6px; 
  font-size: 16px; 
  transition: all 0.4s ease; 
  cursor: pointer;
  background: var(--deep-green); 
  color: white;
  border: 2px solid var(--deep-green);
  box-shadow: 0 8px 24px rgba(52, 81, 58, 0.2);
}

.btn-zalo {
  background: #0084ff;
  border-color: #0084ff;
  box-shadow: 0 8px 24px rgba(0, 132, 255, 0.2);
}

.btn-zalo:hover {
  background: #0073e6;
  border-color: #0073e6;
  box-shadow: 0 12px 32px rgba(0, 132, 255, 0.3);
}

.btn:hover { 
  background: #29422F; 
  transform: translateY(-3px); 
  box-shadow: 0 12px 32px rgba(52, 81, 58, 0.3); 
}

/* Responsive */
/* --- Hero Section --- */
.hero-section {
  text-align: center;
  padding: 60px 2rem 80px;
  background: linear-gradient(135deg, rgba(52, 81, 58, 0.03), rgba(235, 149, 0, 0.05));
  border-radius: 20px;
  margin-bottom: 40px;
}

.hero-title {
  font-family: 'Playfair Display', serif;
  font-size: 42px;
  color: var(--deep-green);
  margin-bottom: 24px;
  font-weight: 700;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--gray);
  max-width: 700px;
  margin: 0 auto 20px;
  line-height: 1.8;
  font-weight: 300;
}

.hero-accent {
  font-size: 16px;
  color: var(--deep-green);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.7;
  font-weight: 500;
}

/* --- Why Choose Us Section --- */
.why-choose-us {
  padding: 60px 2rem;
  margin: 60px 0;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-top: 50px;
}

.why-card {
  background: var(--white);
  border-radius: 16px;
  padding: 40px 30px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.why-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
  border-color: rgba(235, 149, 0, 0.3);
}

.why-icon {
  font-size: 40px;
  margin-bottom: 20px;
}

.why-card h3 {
  font-family: 'Playfair Display', serif;
  font-size: 22px;
  color: var(--deep-green);
  margin: 0 0 15px;
  font-weight: 700;
}

.why-card p {
  font-size: 15px;
  color: var(--gray);
  margin: 0;
  line-height: 1.7;
}

/* --- FAQ Section --- */
.faq-section {
  padding: 60px 2rem;
  margin: 60px 0;
}

.faq-container {
  max-width: 800px;
  margin: 50px auto 0;
}

.faq-item {
  margin-bottom: 20px;
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.faq-item:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.faq-item:nth-child(1) .faq-answer,
.faq-item:nth-child(2) .faq-answer {
  display: block;
}

.faq-question {
  display: flex;
  align-items: flex-start;
  padding: 25px;
  cursor: pointer;
  background: var(--white);
  transition: background 0.3s;
  gap: 15px;
}

.faq-question:hover {
  background: var(--light-gray);
}

.faq-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: var(--soft-gold);
  color: white;
  border-radius: 50%;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.faq-question h3 {
  font-family: 'Playfair Display', serif;
  font-size: 18px;
  color: var(--deep-green);
  margin: 0;
  font-weight: 600;
}

.faq-answer {
  padding: 0 25px 25px 70px;
  display: none;
  animation: slideDown 0.3s ease;
}

.faq-answer p {
  font-size: 15px;
  color: var(--gray);
  line-height: 1.7;
  margin: 0;
}

.faq-item.active .faq-answer {
  display: block;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Testimonials Section --- */
.testimonials-section {
  padding: 60px 2rem;
  margin: 60px 0;
  background: linear-gradient(135deg, rgba(52, 81, 58, 0.02), rgba(235, 149, 0, 0.03));
  border-radius: 20px;
}

.testimonials-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 50px;
}

.testimonial-card {
  background: var(--white);
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.testimonial-stars {
  font-size: 16px;
  color: var(--soft-gold);
  margin-bottom: 15px;
  letter-spacing: 2px;
}

.testimonial-text {
  font-size: 15px;
  color: var(--gray);
  line-height: 1.8;
  margin: 0 0 20px;
  font-style: italic;
}

.testimonial-author {
  border-top: 1px solid var(--border-light);
  padding-top: 15px;
}

.testimonial-author strong {
  display: block;
  color: var(--deep-green);
  font-size: 15px;
  margin-bottom: 5px;
}

.testimonial-author span {
  font-size: 12px;
  color: #999;
}

/* --- Final CTA Section --- */
.final-cta {
  padding: 60px 2rem;
  background: linear-gradient(135deg, var(--deep-green), #2a4530);
  color: var(--white);
  margin-top: 60px;
  border-radius: 20px;
}

.final-cta h2 {
  font-family: 'Playfair Display', serif;
  color: var(--white);
}

.final-cta p {
  color: rgba(255, 255, 255, 0.85);
}

.final-cta .btn {
  background: var(--soft-gold);
  color: var(--deep-green);
  border: 2px solid var(--soft-gold);
  box-shadow: 0 8px 24px rgba(235, 149, 0, 0.2);
  max-width: 300px;
}

.final-cta .btn:hover {
  background: #ffb300;
  border-color: #ffb300;
  box-shadow: 0 12px 32px rgba(235, 149, 0, 0.3);
}

.final-cta a {
  color: var(--white);
}

/* --- Footer --- */
.footer {
  background: var(--deep-green);
  color: var(--white);
  padding: 60px 2rem 30px;
  margin-top: 80px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 50px;
  max-width: 900px;
  margin: 0 auto 40px;
}

.footer-section h3,
.footer-section h4 {
  font-family: 'Playfair Display', serif;
  font-size: 18px;
  margin-bottom: 15px;
  font-weight: 700;
}

.footer-section h3 {
  font-size: 22px;
  margin-bottom: 10px;
}

.footer-section p {
  font-size: 14px;
  line-height: 1.8;
  opacity: 0.9;
  margin-bottom: 10px;
}

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

.footer-section ul li {
  margin-bottom: 10px;
}

.footer-section a {
  opacity: 0.9;
  transition: opacity 0.3s;
}

.footer-section a:hover {
  opacity: 1;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
  opacity: 0.7;
}

/* --- Contact Ribbon --- */
.contact-ribbon {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 15px;
  z-index: 999;
}

.ribbon-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--deep-green);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  font-size: 24px;
}

.ribbon-item:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.ribbon-phone {
  background: var(--soft-gold);
}

/* --- Slider Styling (Range Input) --- */
.slider-item {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.slider-item .label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--deep-green);
}

.slider-item .label strong {
  font-size: 24px;
  color: var(--soft-gold);
  font-weight: 700;
}

.slider-item input[type="range"] {
  width: 100%;
  height: 10px;
  border-radius: 8px;
  background: linear-gradient(to right, var(--light-gray), var(--light-gray)) no-repeat;
  background-size: 0% 100%;
  background-position: left center;
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
  transition: background-size 0.3s ease;
}

/* Webkit Browsers (Chrome, Safari, Edge) */
.slider-item input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--soft-gold);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(235, 149, 0, 0.4);
  border: 3px solid var(--white);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.slider-item input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 6px 18px rgba(235, 149, 0, 0.6);
}

.slider-item input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.25);
  box-shadow: 0 8px 24px rgba(235, 149, 0, 0.8);
}

.slider-item input[type="range"]::-webkit-slider-runnable-track {
  width: 100%;
  height: 10px;
  background: linear-gradient(to right, var(--soft-gold), var(--soft-gold)) no-repeat,
              linear-gradient(to right, var(--border-light), var(--border-light)) no-repeat;
  background-size: 50% 100%, 100% 100%;
  background-position: left center, right center;
  border-radius: 8px;
  border: none;
}

/* Firefox */
.slider-item input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--soft-gold);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(235, 149, 0, 0.4);
  border: 3px solid var(--white);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.slider-item input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 6px 18px rgba(235, 149, 0, 0.6);
}

.slider-item input[type="range"]::-moz-range-thumb:active {
  transform: scale(1.25);
  box-shadow: 0 8px 24px rgba(235, 149, 0, 0.8);
}

.slider-item input[type="range"]::-moz-range-track {
  background: transparent;
  border: none;
}

.slider-item input[type="range"]::-moz-range-progress {
  background: var(--soft-gold);
  height: 10px;
  border-radius: 8px;
}

.hint {
  font-size: 13px;
  color: #999;
  margin-top: 6px;
  font-style: italic;
}

.sliders-section {
  padding-bottom: 40px;
  border-bottom: 2px solid var(--border-light);
  margin-bottom: 40px;
}

@media (max-width: 900px) {
    .feature-list {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

    .testimonials-container {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .contact-ribbon {
        right: 10px;
        gap: 10px;
    }

    .ribbon-item {
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}

@media (max-width: 768px) {
  .container { padding: 80px 1rem 20px; }
  .section-title { font-size: 28px; margin-bottom: 12px; }
  .section-subtitle { padding: 0; font-size: 14px; }

  .hero-section { padding: 40px 1rem 50px; margin-bottom: 30px; }
  .hero-title { font-size: 28px; margin-bottom: 15px; }
  .hero-subtitle { font-size: 14px; margin-bottom: 12px; }
  .hero-accent { font-size: 13px; }

  .why-grid { gap: 15px; margin-top: 30px; }
  .why-card { padding: 25px 15px; }
  .why-icon { font-size: 30px; margin-bottom: 10px; }
  .why-card h3 { font-size: 16px; margin-bottom: 8px; }
  .why-card p { font-size: 13px; }

  .pricing-section { gap: 40px; margin-top: 40px; }
  .package-header { padding: 25px 15px; }
  .package-title { font-size: 24px; margin-bottom: 8px; }
  .package-price { font-size: 32px; margin-bottom: 8px; }
  .package-subtitle { font-size: 13px; }
  .package-body { padding: 25px 15px; }

  .feature-list { gap: 15px; }
  .feature-list li { font-size: 13px; }
  .feature-icon { font-size: 20px; margin-bottom: 3px; }

  .upsell-section { margin-top: 0; }
  .upsell-title { font-size: 22px; margin-bottom: 6px; }
  .upsell-subtitle { font-size: 12px; margin-bottom: 16px; }
  .upsell-grid { grid-template-columns: 1fr; gap: 10px; }
  .upsell-card { padding: 14px 12px; border-radius: 12px; }
  .upsell-icon { font-size: 24px; margin-bottom: 8px; }
  .upsell-name { font-size: 13px; margin-bottom: 6px; font-weight: 600; }
  .upsell-description { font-size: 11px; margin-bottom: 8px; min-height: unset; line-height: 1.5; }
  .upsell-price { font-size: 14px; font-weight: 700; }

  .total-section { padding: 20px 15px; margin-top: 40px; }
  .upgrade-item { font-size: 12px; padding: 5px 0; }
  .total-divider { margin: 10px 0; }
  .final-total { padding-top: 10px; }
  .final-total span:first-child { font-size: 16px; }
  .final-total span:last-child { font-size: 28px; }
  .cta-section { margin-top: 25px; }
  .btn { padding: 14px 30px; font-size: 14px; }

  .faq-section { padding: 40px 1rem; margin: 40px 0; }
  .faq-container { margin-top: 30px; }
  .faq-question { padding: 18px; }
  .faq-question h3 { font-size: 14px; }
  .faq-answer { padding: 0 18px 18px 45px; }
  .faq-answer p { font-size: 13px; }
  .faq-icon { width: 24px; height: 24px; font-size: 12px; }

  .testimonials-section { padding: 40px 1rem; margin: 40px 0; border-radius: 15px; }
  .testimonials-container { gap: 15px; margin-top: 30px; }
  .testimonial-card { padding: 20px 15px; }
  .testimonial-stars { font-size: 14px; }
  .testimonial-text { font-size: 13px; margin-bottom: 15px; }
  .testimonial-author strong { font-size: 13px; }
  .testimonial-author span { font-size: 11px; }

  .final-cta { padding: 40px 1rem; margin-top: 50px; border-radius: 15px; }
  .final-cta h2 { font-size: 22px; margin-bottom: 10px; }
  .final-cta p { font-size: 14px; margin-bottom: 20px; }

  .footer-content { grid-template-columns: 1fr; gap: 20px; }
  .footer-section h3 { font-size: 16px; margin-bottom: 10px; }
  .footer-section h4 { font-size: 14px; margin-bottom: 8px; }
  .footer-section p { font-size: 12px; }
  .footer-bottom { font-size: 11px; padding-top: 20px; }

  .contact-ribbon { right: 10px; gap: 10px; }
  .ribbon-item { width: 45px; height: 45px; font-size: 20px; }

  .menu-toggle { display: block; cursor: pointer; z-index: 1001; }
  .nav-links { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; position: fixed; top: 0; left: -100%; width: 80%; max-width: 320px; height: 100vh; background: var(--cream); padding-top: 100px; transition: left 0.4s ease-in-out; box-shadow: 5px 0 20px rgba(0, 0, 0, 0.1); z-index: 1000; }
  .nav-links.active { left: 0; }
  .nav-links a { padding: 10px 0; width: 80%; text-align: center; border-bottom: 1px solid var(--border-light); }
}

@media (max-width: 480px) {
  .container { padding: 70px 1rem 20px; }
  .section-title { font-size: 24px; margin-bottom: 10px; }
  .section-subtitle { font-size: 12px; margin-bottom: 25px; }

  .package-header { padding: 20px 12px; }
  .package-title { font-size: 20px; margin-bottom: 6px; }
  .package-price { font-size: 28px; margin-bottom: 6px; }
  .package-subtitle { font-size: 12px; }
  .package-body { padding: 20px 12px; }
  .total-price-display { font-size: 18px; margin: 8px 0; }

  .sliders-section { padding-bottom: 25px; margin-bottom: 20px; }
  .slider-item { margin-bottom: 15px; }
  .slider-item .label { font-size: 12px; margin-bottom: 6px; }
  .slider-item input[type="range"] { width: 100%; height: 8px; }
  .slider-item input[type="range"]::-webkit-slider-thumb { width: 20px; height: 20px; box-shadow: 0 3px 10px rgba(235, 149, 0, 0.3); }
  .slider-item input[type="range"]::-moz-range-thumb { width: 20px; height: 20px; box-shadow: 0 3px 10px rgba(235, 149, 0, 0.3); }
  .slider-item .label strong { font-size: 18px; }
  .hint { font-size: 11px; margin-top: 3px; }

  .feature-list { gap: 12px; }
  .feature-list li { font-size: 12px; }
  .feature-icon { font-size: 18px; margin-bottom: 2px; }

  .upsell-title { font-size: 20px; margin-bottom: 6px; }
  .upsell-subtitle { font-size: 12px; margin-bottom: 15px; }
  .upsell-grid { grid-template-columns: 1fr; gap: 12px; }
  .upsell-card { padding: 16px 12px; border-radius: 12px; }
  .upsell-icon { font-size: 24px; margin-bottom: 8px; }
  .upsell-name { font-size: 14px; margin-bottom: 6px; }
  .upsell-description { font-size: 11px; margin-bottom: 8px; }
  .upsell-price { font-size: 14px; }
  .checkmark { width: 20px; height: 20px; line-height: 20px; font-size: 14px; }

  .total-section { padding: 15px 12px; margin-top: 25px; }
  .upgrade-item { font-size: 11px; padding: 4px 0; }
  .total-divider { margin: 8px 0; }
  .final-total { padding-top: 8px; }
  .final-total span:first-child { font-size: 14px; }
  .final-total span:last-child { font-size: 24px; }
  .cta-section { margin-top: 15px; }
  .btn { padding: 12px 20px; font-size: 12px; width: 100%; margin-bottom: 8px; }
  .btn-zalo { margin-bottom: 0; }

  .faq-section { padding: 25px 1rem; margin: 25px 0; }
  .faq-item { margin-bottom: 12px; }
  .faq-question { padding: 14px; }
  .faq-question h3 { font-size: 13px; }
  .faq-answer { padding: 0 14px 14px 40px; }
  .faq-answer p { font-size: 12px; line-height: 1.6; }
  .faq-icon { width: 22px; height: 22px; font-size: 11px; left: 12px; }

  .testimonials-section { padding: 25px 1rem; margin: 25px 0; }
  .testimonials-container { gap: 12px; margin-top: 20px; }
  .testimonial-card { padding: 16px 12px; }
  .testimonial-stars { font-size: 12px; margin-bottom: 8px; }
  .testimonial-text { font-size: 12px; margin-bottom: 12px; line-height: 1.6; }
  .testimonial-author strong { font-size: 12px; }
  .testimonial-author span { font-size: 10px; }

  .final-cta { padding: 25px 1rem; margin-top: 30px; }
  .final-cta h2 { font-size: 20px; margin-bottom: 8px; }
  .final-cta p { font-size: 12px; margin-bottom: 15px; }
  .final-cta a { font-size: 12px; }

  nav { padding: 1rem 0; }
  nav.scrolled { padding: 0.7rem 0; }
  .nav-container { padding: 0 1rem; }
  .logo { font-size: 18px; }
  .nav-links { width: 90%; max-width: none; }

  .contact-ribbon { right: 8px; gap: 8px; }
  .ribbon-item { width: 40px; height: 40px; font-size: 18px; }
}

@media (max-width: 360px) {
  .container { padding: 60px 0.75rem 15px; }
  .section-title { font-size: 20px; }
  .package-title { font-size: 18px; }
  .package-price { font-size: 24px; }
  .upsell-title { font-size: 18px; }
  .final-total span:last-child { font-size: 20px; }
  .btn { padding: 10px 15px; font-size: 11px; }
  .logo { font-size: 16px; }
}