/* Apple.com Exact CSS Design System */
:root {
  --apple-bg-light: #f5f5f7;
  --apple-bg-white: #ffffff;
  --apple-bg-dark: #000000;
  --apple-bg-dark-card: #161617;
  --apple-text-primary: #1d1d1f;
  --apple-text-secondary: #86868b;
  --apple-text-dark-primary: #f5f5f7;
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --apple-link: #0066cc;
  --apple-radius: 28px;
  --apple-font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--apple-font);
  background-color: var(--apple-bg-light);
  color: var(--apple-text-primary);
  line-height: 1.47059;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* Apple Navigation Bar (44px Height, Translucent Blur) */
.apple-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 44px;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  z-index: 9999;
  isolation: isolate;
}

.nav-content {
  max-width: 1024px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  height: 100%;
}

.nav-logo {
  height: 32px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  display: block;
  mix-blend-mode: multiply;
  transition: opacity 0.2s ease;
}

.nav-logo:hover {
  opacity: 0.8;
}

.nav-logo-icon {
  color: var(--apple-blue);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-menu a {
  text-decoration: none;
  color: var(--apple-text-primary);
  font-size: 12px;
  font-weight: 400;
  opacity: 0.8;
  transition: opacity 0.2s ease;
}

.nav-menu a:hover {
  opacity: 1;
  color: var(--apple-blue);
}

.apple-button-small {
  background-color: var(--apple-blue);
  color: #ffffff;
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 980px;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.apple-button-small:hover {
  background-color: var(--apple-blue-hover);
}

/* Typography Elements */
.eyebrow {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--apple-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.eyebrow-dark {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--apple-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.hero-title {
  font-size: 56px;
  font-weight: 600;
  line-height: 1.07143;
  letter-spacing: -0.005em;
  color: var(--apple-text-primary);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 21px;
  font-weight: 400;
  line-height: 1.381;
  color: var(--apple-text-secondary);
  max-w: 760px;
  margin: 0 auto 28px auto;
}

/* Apple Buttons & CTA Links */
.cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 40px;
}

.apple-btn-primary {
  background-color: var(--apple-blue);
  color: #ffffff;
  font-size: 17px;
  font-weight: 400;
  padding: 11px 21px;
  border-radius: 980px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.15s ease;
  display: inline-block;
}

.apple-btn-primary:hover {
  background-color: var(--apple-blue-hover);
  transform: scale(1.01);
}

.apple-link-cta {
  color: var(--apple-link);
  font-size: 17px;
  font-weight: 400;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.apple-link-cta:hover {
  text-decoration: underline;
}

.chevron {
  font-size: 18px;
}

/* Section 1: Hero Primary */
.hero-primary {
  padding-top: 104px;
  padding-bottom: 60px;
  background-color: var(--apple-bg-light);
}

.hero-image-wrapper {
  margin-top: 20px;
  border-radius: var(--apple-radius);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.hero-banner-img {
  width: 100%;
  height: auto;
  display: block;
}

/* Section 2: Dark Pro Contrast */
.hero-dark {
  background-color: var(--apple-bg-dark);
  color: var(--apple-text-dark-primary);
  padding: 100px 0;
}

.section-title-dark {
  font-size: 48px;
  font-weight: 600;
  line-height: 1.08333;
  letter-spacing: -0.003em;
  margin-bottom: 16px;
  background: linear-gradient(180deg, #ffffff 0%, #a1a1a6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle-dark {
  font-size: 21px;
  font-weight: 400;
  color: var(--apple-text-secondary);
  max-width: 800px;
  margin: 0 auto 60px auto;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.metric-card {
  background-color: var(--apple-bg-dark-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 32px 20px;
  border-radius: 20px;
  text-align: center;
}

.metric-number {
  font-size: 40px;
  font-weight: 700;
  color: var(--apple-blue);
  margin-bottom: 8px;
}

.metric-label {
  font-size: 13px;
  color: var(--apple-text-secondary);
  line-height: 1.35;
}

/* Section 3: Apple Bento Feature Grid */
.feature-grid-section {
  padding: 100px 0;
  background-color: var(--apple-bg-white);
}

.section-header {
  margin-bottom: 60px;
}

.section-title {
  font-size: 48px;
  font-weight: 600;
  line-height: 1.08333;
  letter-spacing: -0.003em;
  color: var(--apple-text-primary);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 21px;
  color: var(--apple-text-secondary);
}

.apple-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-tile {
  border-radius: var(--apple-radius);
  padding: 44px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 380px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.grid-tile:hover {
  transform: translateY(-3px);
}

.tile-light {
  background-color: var(--apple-bg-light);
  color: var(--apple-text-primary);
  border: 1px solid rgba(0,0,0,0.05);
}

.tile-dark {
  background-color: var(--apple-bg-dark-card);
  color: var(--apple-text-dark-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.tile-eyebrow {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--apple-blue);
  margin-bottom: 8px;
  display: block;
}

.tile-title {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.14286;
  margin-bottom: 12px;
}

.tile-desc {
  font-size: 15px;
  line-height: 1.46667;
  color: var(--apple-text-secondary);
}

.tech-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.pill {
  background-color: rgba(0, 0, 0, 0.05);
  padding: 6px 14px;
  border-radius: 980px;
  font-size: 12px;
  font-weight: 500;
}

.tile-dark .pill {
  background-color: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.tile-badge {
  display: inline-block;
  margin-top: 24px;
  padding: 8px 16px;
  background-color: rgba(0, 113, 227, 0.15);
  color: var(--apple-blue);
  border-radius: 980px;
  font-size: 13px;
  font-weight: 600;
  align-self: flex-start;
}

/* Section 4: Architecture Steps */
.architecture-section {
  padding: 100px 0;
  background-color: var(--apple-bg-light);
}

.arch-tabs-wrapper {
  margin-bottom: 40px;
}

.arch-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.arch-tab-btn {
  background: var(--apple-bg-white);
  border: 1px solid rgba(0,0,0,0.1);
  padding: 10px 18px;
  border-radius: 980px;
  font-size: 13px;
  font-weight: 500;
  color: var(--apple-text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.arch-tab-btn.active {
  background-color: var(--apple-blue);
  color: #ffffff;
  border-color: var(--apple-blue);
}

.arch-content-card {
  background-color: var(--apple-bg-white);
  border-radius: var(--apple-radius);
  padding: 40px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
}

.arch-badge {
  font-size: 12px;
  font-weight: 600;
  color: var(--apple-blue);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.arch-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 12px;
}

.arch-desc {
  font-size: 17px;
  color: var(--apple-text-secondary);
  margin-bottom: 20px;
}

.arch-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.arch-list li {
  font-size: 15px;
  color: var(--apple-text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.arch-list li::before {
  content: "✓";
  color: var(--apple-blue);
  font-weight: bold;
}

.arch-image-box {
  border-radius: var(--apple-radius);
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0,0,0,0.06);
}

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

/* Section 5: Simulator */
.simulator-section {
  padding: 100px 0;
  background-color: var(--apple-bg-dark);
  color: var(--apple-text-dark-primary);
}

.sim-card {
  background-color: var(--apple-bg-dark-card);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--apple-radius);
  padding: 56px 44px;
}

.sim-header {
  text-align: center;
  margin-bottom: 44px;
}

.sim-title {
  font-size: 40px;
  font-weight: 600;
  margin-bottom: 12px;
}

.sim-desc {
  font-size: 17px;
  color: var(--apple-text-secondary);
}

.sim-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.control-group {
  margin-bottom: 24px;
}

.control-group label {
  display: block;
  font-size: 15px;
  margin-bottom: 10px;
  color: var(--apple-text-dark-primary);
}

.control-group label strong {
  color: var(--apple-blue);
}

.control-group input[type="range"] {
  width: 100%;
  accent-color: var(--apple-blue);
  cursor: pointer;
}

.control-group select {
  width: 100%;
  padding: 12px 16px;
  border-radius: 12px;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  font-size: 14px;
  outline: none;
}

.sim-results {
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.res-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.res-label {
  font-size: 12px;
  color: var(--apple-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.res-value {
  font-size: 28px;
  font-weight: 700;
  color: #ffffff;
}

.res-value.highlight {
  color: var(--apple-blue);
}

/* Section 6: Contact */
.contact-section {
  padding: 100px 0;
  background-color: var(--apple-bg-white);
}

.apple-form {
  max-width: 600px;
  margin: 40px auto 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.apple-form input,
.apple-form select {
  width: 100%;
  padding: 14px 18px;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.15);
  background-color: var(--apple-bg-light);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s ease;
}

.apple-form input:focus,
.apple-form select:focus {
  border-color: var(--apple-blue);
  background-color: #ffffff;
}

.apple-btn-primary.full-width {
  width: 100%;
  margin-top: 8px;
}

.form-feedback {
  margin-top: 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--apple-blue);
}

/* Apple Footer */
.apple-footer {
  background-color: var(--apple-bg-light);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  padding: 40px 0;
  font-size: 11px;
  color: #6e6e73;
}

.footer-brand {
  margin-bottom: 20px;
}

.footer-logo {
  height: 36px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
  display: block;
  mix-blend-mode: multiply;
}

.footer-intro {
  line-height: 1.4;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.footer-col h4 {
  font-size: 11px;
  font-weight: 600;
  color: var(--apple-text-primary);
  margin-bottom: 10px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col a {
  color: #6e6e73;
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--apple-text-primary);
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  color: #6e6e73;
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .hero-title {
    font-size: 38px;
  }
  .section-title, .section-title-dark, .sim-title {
    font-size: 32px;
  }
  .apple-grid, .sim-body, .form-row, .metrics-grid {
    grid-template-columns: 1fr;
  }
  .nav-menu {
    display: none;
  }
}