/* ============================================================
   SILENTFIT — Main Website Styles
   ============================================================ */

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: 64px;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-brand-text {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-display);
  letter-spacing: 0.02em;
}

.nav-brand-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  font-family: var(--font-data);
  font-size: var(--label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color var(--duration-micro) var(--ease-out);
  padding: 4px 0;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-display);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--text-display);
}

.nav-cta {
  margin-left: var(--space-md);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text-display);
  transition: all var(--duration-micro) var(--ease-out);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 64px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-dot-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--border) 0.8px, transparent 0.8px);
  background-size: 16px 16px;
  opacity: 0.4;
}

.hero-gradient {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to top, var(--black), transparent);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: left;
  max-width: 900px;
  padding: var(--space-4xl) var(--space-lg);
}

.hero-label {
  font-family: var(--font-data);
  font-size: var(--label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero-label .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 700;
  color: var(--text-display);
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-xl);
}

.hero-title .accent {
  color: var(--accent);
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: var(--subheading);
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.5;
  margin-bottom: var(--space-2xl);
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  align-items: center;
}

.hero-status {
  font-family: var(--font-data);
  font-size: var(--caption);
  color: var(--text-disabled);
  letter-spacing: 0.04em;
  margin-top: var(--space-2xl);
}

.hero-watch-preview {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
  opacity: 0.15;
}

.hero-watch-frame {
  width: 240px;
  height: 280px;
  border: 2px solid var(--border-visible);
  border-radius: 28px;
  position: relative;
  overflow: hidden;
}

.hero-watch-frame canvas {
  width: 100%;
  height: 100%;
  image-rendering: auto;
}

/* --- Features Section --- */
.features {
  padding: var(--space-4xl) 0;
}

.section-label {
  font-family: var(--font-data);
  font-size: var(--label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-label .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
}

.section-title {
  font-family: var(--font-body);
  font-size: var(--display-md);
  font-weight: 500;
  color: var(--text-display);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3xl);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  transition: border-color var(--duration-micro) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  border-color: var(--border-visible);
}

.feature-card-dot-grid {
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background-image: radial-gradient(circle, var(--border) 0.5px, transparent 0.5px);
  background-size: 10px 10px;
  opacity: 0.3;
}

.feature-icon {
  font-family: var(--font-display);
  font-size: var(--display-lg);
  font-weight: 700;
  color: var(--text-display);
  line-height: 1;
  margin-bottom: var(--space-lg);
}

.feature-icon.accent {
  color: var(--accent);
}

.feature-title {
  font-family: var(--font-body);
  font-size: var(--subheading);
  font-weight: 500;
  color: var(--text-display);
  margin-bottom: var(--space-sm);
}

.feature-desc {
  font-size: var(--body-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Watch Preview Section --- */
.watch-preview-section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.watch-showcase {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
}

.watch-frame {
  width: 240px;
  height: 280px;
  border: 2px solid var(--border-visible);
  border-radius: 28px;
  position: relative;
  overflow: hidden;
  background: #000;
  flex-shrink: 0;
  transition: transform var(--duration-transition) var(--ease-out), border-color var(--duration-micro) var(--ease-out);
}

.watch-frame:hover {
  border-color: var(--text-disabled);
  transform: scale(1.02);
}

.watch-frame canvas {
  width: 100%;
  height: 100%;
  image-rendering: auto;
}

.watch-frame-label {
  position: absolute;
  bottom: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-data);
  font-size: var(--label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* --- Preset Gallery --- */
.presets-section {
  padding: var(--space-4xl) 0;
}

.presets-nav {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.preset-filter {
  font-family: var(--font-data);
  font-size: var(--label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 8px 16px;
  border: 1px solid var(--border-visible);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  background: transparent;
  transition: all var(--duration-micro) var(--ease-out);
  cursor: pointer;
}

.preset-filter:hover {
  color: var(--text-display);
  border-color: var(--text-primary);
}

.preset-filter.active {
  background: var(--text-display);
  color: var(--black);
  border-color: var(--text-display);
}

.presets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-md);
}

.preset-card {
  aspect-ratio: 240 / 280;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--duration-micro) var(--ease-out);
  position: relative;
}

.preset-card:hover {
  border-color: var(--border-visible);
  transform: translateY(-2px);
}

.preset-card canvas {
  width: 100%;
  height: 100%;
  image-rendering: auto;
}

.preset-card-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
}

.preset-card-name {
  font-family: var(--font-data);
  font-size: var(--label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-display);
}

/* --- Designer CTA Section --- */
.designer-cta {
  padding: var(--space-4xl) 0;
  position: relative;
}

.designer-cta-inner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--space-3xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.designer-cta-bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--border) 0.5px, transparent 0.5px);
  background-size: 14px 14px;
  opacity: 0.2;
}

.designer-cta-content {
  position: relative;
  z-index: 1;
}

.designer-cta-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 72px);
  font-weight: 700;
  color: var(--text-display);
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.designer-cta-desc {
  font-size: var(--body);
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto var(--space-xl);
  line-height: 1.5;
}

/* --- How It Works --- */
.how-it-works {
  padding: var(--space-4xl) 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  counter-reset: step;
}

.step-card {
  position: relative;
  padding: var(--space-xl) var(--space-lg);
  border-left: 1px solid var(--border);
}

.step-number {
  font-family: var(--font-display);
  font-size: var(--display-lg);
  font-weight: 700;
  color: var(--border-visible);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.step-title {
  font-family: var(--font-body);
  font-size: var(--subheading);
  font-weight: 500;
  color: var(--text-display);
  margin-bottom: var(--space-sm);
}

.step-desc {
  font-size: var(--body-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Specs Section --- */
.specs-section {
  padding: var(--space-4xl) 0;
}

.specs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.spec-item {
  border-left: 1px solid var(--border);
  padding-left: var(--space-md);
}

.spec-value {
  font-family: var(--font-data);
  font-size: var(--display-md);
  font-weight: 700;
  color: var(--text-display);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.spec-label {
  font-family: var(--font-data);
  font-size: var(--label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* --- Support / BMC Section --- */
.support-section {
  padding: var(--space-4xl) 0;
  border-top: 1px solid var(--border);
}

.support-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.support-content h2 {
  font-family: var(--font-body);
  font-size: var(--heading);
  font-weight: 500;
  color: var(--text-display);
  margin-bottom: var(--space-md);
}

.support-content p {
  font-size: var(--body);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-lg);
}

.bmc-button-img {
  height: 48px;
  border-radius: var(--radius-compact);
  transition: opacity var(--duration-micro) var(--ease-out);
}

.bmc-button-img:hover {
  opacity: 0.9;
}

.support-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.support-qr img {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-compact);
}

.support-qr .label {
  text-align: center;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-2xl) 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-display);
}

.footer-brand-desc {
  font-size: var(--body-sm);
  color: var(--text-secondary);
  max-width: 280px;
}

.footer-links {
  display: flex;
  gap: var(--space-2xl);
}

.footer-column h4 {
  font-family: var(--font-data);
  font-size: var(--label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-column a {
  font-size: var(--body-sm);
  color: var(--text-disabled);
  transition: color var(--duration-micro) var(--ease-out);
}

.footer-column a:hover {
  color: var(--text-display);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

.footer-copyright {
  font-family: var(--font-data);
  font-size: var(--caption);
  color: var(--text-disabled);
  letter-spacing: 0.04em;
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.footer-social a {
  color: var(--text-disabled);
  font-family: var(--font-data);
  font-size: var(--caption);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* --- Theme Toggle --- */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border-visible);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-micro) var(--ease-out);
  font-size: 16px;
}

.theme-toggle:hover {
  border-color: var(--text-primary);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-in {
  opacity: 0;
  animation: fadeInUp 0.6s var(--ease-out) forwards;
}

.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }
.animate-in-delay-4 { animation-delay: 0.4s; }

/* --- Mobile Responsive --- */
@media (max-width: 1024px) {
  .hero-watch-preview {
    display: none;
  }

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

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

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

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    border-bottom: 1px solid var(--border);
    padding: var(--space-lg);
    flex-direction: column;
    gap: var(--space-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    margin-left: 0;
    width: 100%;
    text-align: center;
  }

  .hero-title {
    font-size: clamp(36px, 10vw, 72px);
  }

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

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

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

  .support-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .support-content {
    order: 1;
  }

  .support-qr {
    order: 2;
  }

  .footer-inner {
    flex-direction: column;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-lg);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .section-title {
    font-size: var(--heading);
  }
}