@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  --bg-dark: #070b13;
  --bg-card: rgba(15, 23, 42, 0.45);
  --bg-card-hover: rgba(20, 32, 58, 0.65);
  --border-color: rgba(134, 72, 150, 0.15);
  --border-hover: rgba(134, 72, 150, 0.35);
  
  --primary: #864896;
  --primary-glow: rgba(134, 72, 150, 0.35);
  --secondary: #00a8ff;
  --secondary-glow: rgba(0, 168, 255, 0.25);
  --accent: #b97ac9;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --font-title: 'Outfit', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
  
  --transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;

  --logo-text: #94a3b8;
  --header-bg: rgba(7, 11, 19, 0.7);
  --header-bg-scrolled: rgba(7, 11, 19, 0.9);
  --row-bg: rgba(255, 255, 255, 0.02);
  --row-border: rgba(255, 255, 255, 0.05);
  --calc-right-bg: rgba(7, 11, 19, 0.5);
  --calc-right-border: rgba(134, 72, 150, 0.25);
  --calc-wrapper-bg: linear-gradient(135deg, rgba(15, 23, 42, 0.6) 0%, rgba(7, 11, 19, 0.8) 100%);
  --faq-active-bg: rgba(15, 23, 42, 0.7);
  --faq-active-border: rgba(134, 72, 150, 0.3);
}

body.light-theme {
  --bg-dark: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --border-color: rgba(134, 72, 150, 0.08);
  --border-hover: rgba(134, 72, 150, 0.2);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --primary-glow: rgba(134, 72, 150, 0.12);
  --secondary-glow: rgba(0, 168, 255, 0.08);
  
  --logo-text: #475569;
  --header-bg: rgba(248, 250, 252, 0.75);
  --header-bg-scrolled: rgba(248, 250, 252, 0.95);
  --row-bg: rgba(15, 23, 42, 0.03);
  --row-border: rgba(15, 23, 42, 0.08);
  --calc-right-bg: rgba(255, 255, 255, 0.8);
  --calc-right-border: rgba(134, 72, 150, 0.15);
  --calc-wrapper-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.75) 0%, rgba(241, 245, 249, 0.95) 100%);
  --faq-active-bg: rgba(255, 255, 255, 0.95);
  --faq-active-border: rgba(134, 72, 150, 0.25);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-body);
  overflow-x: hidden;
  line-height: 1.6;
}

/* Background Ambient Glows */
.ambient-glow-1 {
  position: absolute;
  top: -10%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--secondary-glow) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(80px);
}

.ambient-glow-2 {
  position: absolute;
  top: 45%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(80px);
}

.ambient-glow-3 {
  position: absolute;
  bottom: 5%;
  right: -5%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, var(--secondary-glow) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(90px);
}

/* Typography & Layout */
h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
}

.gradient-text {
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary) 70%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header & Navbar */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  background: var(--header-bg);
  transition: var(--transition);
}

header.scrolled {
  background: var(--header-bg-scrolled);
  padding: 0.5rem 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--primary);
  color: var(--primary);
  transform: scale(1.05);
}

body.light-theme .theme-toggle-btn:hover {
  background: rgba(0, 102, 255, 0.05);
}

.theme-toggle-btn .sun-icon {
  display: block;
}
.theme-toggle-btn .moon-icon {
  display: none;
}

body.light-theme .theme-toggle-btn .sun-icon {
  display: none;
}
body.light-theme .theme-toggle-btn .moon-icon {
  display: block;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  transition: var(--transition);
}

header.scrolled .nav-container {
  height: 65px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.logo-dot {
  color: var(--primary);
  text-shadow: 0 0 10px var(--primary-glow);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-fast);
  position: relative;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: var(--transition-fast);
}

.nav-links a:hover::after {
  width: 100%;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  font-family: var(--font-title);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--primary-glow);
  filter: brightness(1.1);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  font-family: var(--font-title);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 180px 0 100px;
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.hero-badge {
  background: rgba(0, 210, 255, 0.08);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1.2rem;
  border-radius: 50px;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.hero-badge-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.6; }
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.15rem;
  margin-bottom: 2.5rem;
  max-width: 550px;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
}

.hero-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-bg {
  position: absolute;
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 65%);
  z-index: 1;
  border-radius: 50%;
  animation: float-bg 8s ease-in-out infinite alternate;
}

.hero-image {
  position: relative;
  z-index: 2;
  width: 85%;
  max-width: 380px;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.4));
  animation: float-bottle 6s ease-in-out infinite;
}

@keyframes float-bottle {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(1deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

@keyframes float-bg {
  0% { transform: scale(0.9) translate(0, 0); }
  100% { transform: scale(1.1) translate(10px, 10px); }
}

/* Feature Cards Section */
.features {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 4rem;
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 2.5rem 2rem;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-8px);
  box-shadow: 0 15px 35px rgba(0, 210, 255, 0.08);
}

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: rgba(0, 210, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(0, 210, 255, 0.2);
  transition: var(--transition);
}

.feature-card:hover .feature-icon-wrapper {
  background: var(--primary);
  color: var(--bg-dark);
  box-shadow: 0 0 15px var(--primary-glow);
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Products Section */
.products {
  padding: 100px 0;
  position: relative;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3.5rem;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 32px;
  overflow: hidden;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 20px 45px rgba(0, 102, 255, 0.08);
  transform: translateY(-5px);
}

.product-img-container {
  height: 380px;
  background: radial-gradient(circle at center, rgba(0, 102, 255, 0.12) 0%, transparent 70%);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  padding: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.product-img {
  max-height: 85%;
  max-width: 85%;
  object-fit: contain;
  filter: drop-shadow(0 15px 30px rgba(0,0,0,0.35));
  transition: var(--transition);
}

.product-card:hover .product-img {
  transform: scale(1.04) translateY(-5px);
}

.product-content {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.product-badge {
  background: rgba(0, 255, 204, 0.08);
  border: 1px solid rgba(0, 255, 204, 0.2);
  color: var(--accent);
  padding: 0.35rem 1rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
  align-self: flex-start;
  margin-bottom: 1.2rem;
}

.product-content h3 {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}

.product-description {
  font-size: 0.98rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.product-specs {
  list-style: none;
  margin-bottom: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.product-specs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.product-specs li svg {
  color: var(--accent);
  flex-shrink: 0;
}

.product-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.product-price-info {
  display: flex;
  flex-direction: column;
}

.price-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.price-value {
  font-size: 1.6rem;
  font-family: var(--font-title);
  font-weight: 800;
  color: var(--text-primary);
}

/* Calculator & Hydration Planner */
.calculator-section {
  padding: 100px 0;
  position: relative;
}

.calculator-wrapper {
  background: var(--calc-wrapper-bg);
  border: 1px solid var(--border-color);
  border-radius: 32px;
  padding: 3.5rem;
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.calc-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.calc-left h2 {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.calc-left p {
  margin-bottom: 2rem;
}

.calc-controls {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.calc-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--row-bg);
  padding: 1.2rem 1.8rem;
  border-radius: 20px;
  border: 1px solid var(--row-border);
}

.item-info h4 {
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}

.item-info span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.item-counter {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.btn-counter {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-weight: bold;
  font-size: 1.2rem;
  transition: var(--transition-fast);
}

.btn-counter:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--bg-dark);
}

.counter-value {
  font-family: var(--font-title);
  font-size: 1.3rem;
  font-weight: 700;
  min-width: 25px;
  text-align: center;
}

.calc-right {
  background: var(--calc-right-bg);
  border: 1px solid var(--calc-right-border);
  border-radius: 24px;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.calc-title {
  font-size: 1.3rem;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 1rem;
}

.calc-summary-items {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
}

.summary-row.total {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.2rem;
  font-weight: 700;
  font-size: 1.2rem;
  font-family: var(--font-title);
}

.total-accent {
  color: var(--primary);
}

.whatsapp-box {
  margin-top: auto;
}

.whatsapp-box .btn-primary {
  width: 100%;
  justify-content: center;
  padding: 0.9rem;
}

.whatsapp-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 0.75rem;
}

/* Process Section */
.process {
  padding: 100px 0;
  position: relative;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
  position: relative;
}

.process-steps::after {
  content: '';
  position: absolute;
  top: 90px;
  left: 10%;
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 50%, transparent 100%);
  z-index: 1;
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 2;
}

.step-num {
  width: 60px;
  height: 60px;
  background: var(--bg-dark);
  border: 2px solid var(--primary);
  color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.3rem;
  margin-bottom: 2rem;
  box-shadow: 0 0 20px var(--primary-glow);
}

.process-step h3 {
  font-size: 1.25rem;
  margin-bottom: 0.8rem;
}

.process-step p {
  font-size: 0.9rem;
  max-width: 280px;
}

/* FAQs Section */
.faq {
  padding: 100px 0;
  position: relative;
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  margin-bottom: 1.2rem;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--border-hover);
}

.faq-trigger {
  width: 100%;
  background: none;
  border: none;
  padding: 1.5rem;
  text-align: left;
  color: var(--text-primary);
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--primary);
  transition: var(--transition);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 1.5rem;
}

.faq-content p {
  padding-bottom: 1.5rem;
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active {
  background: var(--faq-active-bg);
  border-color: var(--faq-active-border);
}

.faq-item.active .faq-content {
  max-height: 1000px;
  transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--accent);
}

/* Footer */
footer {
  background: #04070c;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-info p {
  margin-top: 1rem;
  margin-bottom: 1.5rem;
  max-width: 320px;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  width: 38px;
  height: 38px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--primary);
  color: var(--bg-dark);
  border-color: var(--primary);
  transform: translateY(-3px);
}

.footer-nav h4, .footer-contact h4 {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--primary);
  padding-left: 3px;
}

.contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  color: var(--text-secondary);
}

.contact-list svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1.8rem;
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-fast);
}

.footer-bottom-links a:hover {
  color: var(--text-secondary);
}

/* Responsiveness */
@media screen and (max-width: 1024px) {
  .hero h1 { font-size: 3rem; }
  .products-grid { gap: 2rem; }
}

@media screen and (max-width: 968px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  .hero-badge { justify-content: center; }
  .hero h1 { font-size: 2.8rem; }
  .hero p { margin: 0 auto 2rem; }
  .hero-actions { justify-content: center; }
  .hero-image-wrapper { order: -1; }
  .hero-image { max-width: 280px; }
  
  .products-grid { grid-template-columns: 1fr; max-width: 550px; margin: 0 auto; }
  .calc-grid { grid-template-columns: 1fr; gap: 3rem; }
  .process-steps { grid-template-columns: 1fr; gap: 3rem; }
  .process-steps::after { display: none; }
  
  .footer-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  
  .menu-toggle { display: block; }
  .nav-links {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-dark);
    flex-direction: column;
    align-items: center;
    padding: 3rem 0;
    gap: 2rem;
    transition: var(--transition);
    border-top: 1px solid var(--border-color);
  }
  .nav-links.active {
    left: 0;
  }
}

@media screen and (max-width: 480px) {
  .container { padding: 0 1.25rem; }
  .hero h1 { font-size: 2.2rem; }
  .hero-actions { flex-direction: column; width: 100%; gap: 1rem; }
  .hero-actions .btn-primary, .hero-actions .btn-secondary { width: 100%; justify-content: center; }
  .section-header h2 { font-size: 2rem; }
  .calc-row { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .calc-row .item-counter { align-self: flex-end; }
  .product-specs { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
  .footer-bottom-links { justify-content: center; }
}