/* ================================================================
   MUTED — Premium Air Purifier
   Minimalist Dark Theme | Luxury Design System
================================================================ */

/* ==============================================================
   RESET & BASE STYLES
============================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #030303 0%, #0b1014 100%);
  color: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==============================================================
   TYPOGRAPHY HIERARCHY
============================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Sora', sans-serif;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
}

h2 {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  font-weight: 400;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==============================================================
   LAYOUT & CONTAINER
============================================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 2.5rem);
}

.section {
  padding: clamp(2rem, 6vw, 4rem) 0;
}

.section-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: #bfbfbf;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 1rem;
  display: inline-block;
}

.section-heading {
  margin-bottom: 1.5rem;
  max-width: 800px;
}

.section-text {
  font-size: 1rem;
  line-height: 1.8;
  color: #bfbfbf;
  margin-bottom: 1.5rem;
  max-width: 700px;
}

.section-text.large {
  font-size: 1.25rem;
  font-weight: 500;
  color: #ffffff;
  margin-bottom: 2rem;
}

/* ==============================================================
   BUTTONS
============================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  cursor: pointer;
  transition: all 280ms cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  text-decoration: none;
  backdrop-filter: blur(10px);
}

.btn:hover {
  background: linear-gradient(135deg, #ffffff 0%, #dfe8ef 100%);
  color: #05070b;
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.22);
}

.btn-primary {
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-secondary {
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: rgba(255, 255, 255, 0.8);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: #ffffff;
  color: #ffffff;
}

.btn-large {
  padding: 1.25rem 3rem;
  font-size: 1.125rem;
}

/* ==============================================================
   HEADER / NAVIGATION
============================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: transparent;
  backdrop-filter: none;
  z-index: 1000;
  border-bottom: none;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 1.25rem 0 1.25rem 1.5rem;
  width: 100%;
  max-width: 100%;
}

.header > .container {
  padding-left: 0 !important;
  padding-right: 0 !important;
  max-width: 100%;
}

.logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  height: 82px;
  margin-right: auto;
  margin-top: -0.5rem;
}
.logo img {
  height: 100%;
  width: auto;
  display: block;
  max-width: min(360px, 72vw);
  object-fit: contain;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex: 1;
  justify-content: center;
  padding: 0;
  flex-wrap: wrap;
}

.nav-link {
  font-size: 0.95rem;
  color: #bfbfbf;
  font-weight: 500;
  position: relative;
  padding: 0.75rem 1rem;
  text-decoration: none;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: #ffffff;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: #ffffff;
  transition: width 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

.header-menu {
  margin-left: auto;
  position: relative;
}

.header-menu-button {
  background: transparent;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.75rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 220ms ease, border-color 220ms ease, color 220ms ease;
}

.header-menu-button:hover,
.header-menu-button.open {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.45);
}

.header-menu-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  background: rgba(0, 0, 0, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  border-radius: 0.75rem;
  padding: 0.75rem 0;
  min-width: 180px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  z-index: 1001;
}

.header-menu-dropdown.open {
  display: flex;
  flex-direction: column;
}

.header-menu-link {
  color: #bfbfbf;
  padding: 0.75rem 1rem;
  text-decoration: none;
  transition: color 220ms ease, background 220ms ease;
}

.header-menu-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.05);
}

.nav-cta {
  color: #ffffff;
  padding: 0.75rem 1.75rem;
  border: none;
  border-radius: 0;
  transition: all 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-cta:hover {
  background-color: #ffffff;
  color: #000000;
}

/* ==============================================================
   HERO SECTION
============================================================== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 720px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: 0;
  padding: 8rem 1.5rem 4rem;
}

.hero-background {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background-color: #000;
  image-rendering: auto;
}

.hero-background img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  image-rendering: auto;
  filter: contrast(1.04) saturate(1.1);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    rgba(0, 0, 0, 0.45) 0%,
    rgba(0, 0, 0, 0.28) 40%,
    rgba(0, 0, 0, 0.22) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  width: 100%;
  padding: clamp(1.75rem, 3vw, 2.75rem);
  border: none;
  border-radius: 0;
  background: transparent;
  backdrop-filter: none;
  box-shadow: none;
  animation: fadeInUp 1s ease-out;
  text-align: center;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  margin-bottom: 1.15rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: #dfe7ee;
}

.hero-headline {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.hero-brand {
  font-size: clamp(2.4rem, 5.6vw, 4.4rem);
  line-height: 0.98;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.hero-subline {
  font-size: clamp(0.95rem, 1.8vw, 1.2rem);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #c6d2dc;
}

.hero-tagline {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #d8e0e8;
  margin: 0 auto 2rem;
  max-width: 620px;
}

.hero .btn {
  margin-top: 0.5rem;
}

.hero-cta-group {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.hero-cta-group .btn {
  margin-top: 0;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==============================================================
   PRODUCT SECTION
============================================================== */
.product-section {
  background-color: #0b0b0b;
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6rem;
  align-items: center;
}

.product-content h2 {
  margin-bottom: 2rem;
  margin-top: 1rem;
}

.product-stats {
  display: flex;
  gap: 3rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.stat-value {
  font-size: 1.875rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.875rem;
  color: #bfbfbf;
  font-weight: 500;
}

/* ==============================================================
   FEATURES SECTION
============================================================== */
.features-section {
  background-color: #000000;
}

.section-header {
  margin-bottom: 2.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  padding: 2rem;
  background: linear-gradient(135deg, #1a1a1a 0%, #111111 100%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 0.5rem;
  position: relative;
  overflow: hidden;
  transition: all 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

.feature-card:hover {
  border-color: rgba(255, 255, 255, 0.3);
  background: linear-gradient(135deg, #222222 0%, #1a1a1a 100%);
  transform: translateY(-4px);
}

.feature-number {
  font-size: 3rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.1);
  margin-bottom: 1rem;
  line-height: 1;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.feature-text {
  font-size: 0.95rem;
  line-height: 1.8;
  color: #bfbfbf;
}

/* ==============================================================
   BRAND SECTION
============================================================== */
.brand-section {
  background-color: #0b0b0b;
}

.brand-content {
  max-width: 900px;
  margin: 0 auto;
}

.brand-content h2 {
  margin-bottom: 2rem;
  margin-top: 1rem;
}

.brand-content .section-text {
  font-size: 1rem;
}

/* ==============================================================
   CONTACT / CTA SECTION
============================================================== */
.contact-section {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #000000;
  text-align: center;
  z-index: 999;
  width: 100%;
  height: 100vh;
  overflow-y: auto;
  padding: clamp(80px, 10vw, 100px) clamp(1rem, 5vw, 2.5rem) clamp(2rem, 6vw, 4rem);
  visibility: hidden;
  opacity: 0;
  transition: opacity 300ms ease, visibility 300ms ease;
}

.contact-section.active {
  visibility: visible;
  opacity: 1;
}

.contact-close {
  position: fixed;
  top: 1.5rem;
  right: 2rem;
  background: none;
  border: none;
  font-size: 2rem;
  color: #ffffff;
  cursor: pointer;
  z-index: 1000;
  padding: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

.contact-close:hover {
  color: #bfbfbf;
  transform: rotate(90deg);
}

.contact-content {
  padding: 1rem 0;
}

.contact-content h2 {
  margin-bottom: 0.75rem;
}

.contact-content .section-text {
  font-size: 1rem;
  color: #bfbfbf;
  margin: 0 auto 2.5rem auto;
  max-width: 600px;
}

.contact-box {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  padding: 2.5rem;
  background: linear-gradient(135deg, #1a1a1a 0%, #111111 100%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 0.5rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-align: left;
  transition: all 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

.contact-item:hover {
  transform: translateY(-4px);
}

.contact-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: #bfbfbf;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.contact-value {
  font-size: 1rem;
  font-weight: 500;
  color: #ffffff;
  line-height: 1.6;
}

.contact-value:hover {
  color: #bfbfbf;
  text-decoration: underline;
}

/* ==============================================================
   FOOTER
============================================================== */
.footer {
  background-color: rgba(0, 0, 0, 0.15);
  background: rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(12px);
  padding: 2rem 2rem 1rem 2rem;
  position: relative;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto 1.5rem;
  gap: 1rem;
}

.footer-brand {
  flex: 0 0 auto;
  padding: 0;
  border: none;
}

.footer-logo {
  display: block;
  height: 64px;
  width: auto;
  max-width: min(320px, 78vw);
  object-fit: contain;
  opacity: 0.95;
  transition: opacity 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.footer-brand:hover .footer-logo {
  opacity: 1;
}

/* FOOTER NAVIGATION */
.footer-nav {
  display: flex;
  gap: 2rem;
  flex: 1;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.nav-item {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 400;
  letter-spacing: 0.3px;
  transition: all 300ms cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  flex: 1;
  text-align: center;
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.6);
  transition: width 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-item:hover {
  color: rgba(255, 255, 255, 0.95);
}

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

/* FOOTER BOTTOM */
.footer-bottom {
  text-align: center;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.4px;
  padding: 0.75rem 0 1rem;

}

/* ==============================================================
   RESPONSIVE DESIGN
============================================================== */
@media (max-width: 1024px) {
  .product-grid {
    gap: 3rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 1.5rem;
    align-items: flex-start;
  }

  .footer-nav {
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }

  .hero {
    margin-top: 56px;
    justify-content: center;
  }

  .hero-content {
    max-width: 100%;
    text-align: center;
  }

  .hero-headline {
    font-size: clamp(2rem, 6vw, 3rem);
  }

  .hero-tagline {
    font-size: 1rem;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    flex-direction: column;
    gap: 1rem;
  }

  .section {
    padding: 2rem 0;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .product-stats {
    gap: 2rem;
  }

  .section-heading {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }

  .section-text {
    font-size: 0.95rem;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 0;
  }

  .header-content {
    padding: 1rem;
  }

  .container {
    padding: 0 1rem;
  }

  .hero {
    margin-top: 0;
    min-height: 500px;
    padding: 6rem 0 2rem 0;
  }

  .hero-content {
    padding: 0 1rem;
  }

  .hero-headline {
    font-size: 1.75rem;
  }

  .hero-tagline {
    font-size: 0.95rem;
  }

  .btn {
    padding: 0.875rem 1.75rem;
    font-size: 0.95rem;
  }

  .btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
  }

  .product-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }

  .stat-value {
    font-size: 1.5rem;
  }

  .feature-card {
    padding: 1.75rem;
  }

  .footer {
    padding: 2rem 1.5rem 1rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 1rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 1rem;
    width: 100%;
  }

  .nav-item {
    text-align: center;
  }

  .contact-box {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 2rem;
  }
}

/* ==============================================================
   ACCESSIBILITY & FOCUS STATES
============================================================== */
button:focus,
a:focus {
  outline: 2px solid rgba(255, 255, 255, 0.3);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==============================================================
   PRINT STYLES
============================================================== */
@media print {
  .header,
  .btn {
    display: none;
  }

  body {
    background-color: #ffffff;
    color: #000000;
  }
}