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

/* ==========================================================================
   Design Tokens & CSS Variables
   ========================================================================== */
:root {
  /* Color Palette */
  --bg-slate: #0B0F19;
  --bg-surface: rgba(15, 23, 42, 0.7);
  --bg-surface-border: rgba(255, 255, 255, 0.08);

  --accent-teal: #2DD4BF;
  --accent-amber: #FBBF24;

  --text-primary: #F8FAFC;
  --text-muted: #94A3B8;

  /* Heart Rate Zone Colors */
  --zone-1: #9E9E9E;
  --zone-2: #4CAF50;
  --zone-3: #FFC107;
  --zone-4: #FF9800;
  --zone-5: #F44336;
}

/* ==========================================================================
   Global Reset & Base Typography
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-slate);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', 'Inter', sans-serif;
  color: var(--text-primary);
  line-height: 1.2;
}

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

a {
  color: var(--accent-teal);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #5eead4;
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .grid-3 {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

/* ==========================================================================
   Component: Glass Card
   ========================================================================== */
.glass-card {
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--bg-surface-border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

/* ==========================================================================
   Component: Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  min-height: 48px;
  touch-action: manipulation;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background-color: var(--accent-teal);
  color: #0B0F19;
  box-shadow: 0 4px 14px 0 rgba(45, 212, 191, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(45, 212, 191, 0.5);
  background-color: #34d399;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--bg-surface-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  color: var(--text-primary);
}

/* ==========================================================================
   Component: Calculator & Zone Results Widget
   ========================================================================== */
.zone-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  margin-bottom: 8px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--bg-surface-border);
  transition: background 0.2s ease, transform 0.2s ease;
}

.zone-row:hover {
  background: rgba(255, 255, 255, 0.06);
}

.zone-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.zone-badge {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.zone-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.zone-range {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.bpm-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Specific Zone Colors */
.zone-1-color { background-color: var(--zone-1); }
.zone-2-color { background-color: var(--zone-2); }
.zone-3-color { background-color: var(--zone-3); }
.zone-4-color { background-color: var(--zone-4); }
.zone-5-color { background-color: var(--zone-5); }

/* ==========================================================================
   Component: Navbar
   ========================================================================== */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--bg-surface-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent-teal), var(--accent-amber));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

/* Hamburger Menu Button */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.hamburger-line {
  width: 100%;
  height: 3px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease;
}

/* Hamburger Animated Active State */
.hamburger.open .hamburger-line:nth-child(1) {
  transform: translateY(8.5px) rotate(45deg);
}

.hamburger.open .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.open .hamburger-line:nth-child(3) {
  transform: translateY(-8.5px) rotate(-45deg);
}

/* ==========================================================================
   Component: Hero & Phone Mockup
   ========================================================================== */
.hero {
  padding-top: 60px;
  padding-bottom: 60px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  background: rgba(45, 212, 191, 0.1);
  border: 1px solid rgba(45, 212, 191, 0.25);
  color: var(--accent-teal);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2.0rem, 5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p.subheadline {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
}

.phone-frame {
  position: relative;
  width: 100%;
  max-width: 290px;
  margin: 0 auto;
  border-radius: 36px;
  background: #0B0F19;
  border: 6px solid #1E293B;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8), 0 0 35px rgba(45, 212, 191, 0.2);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.phone-frame:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.9), 0 0 45px rgba(45, 212, 191, 0.3);
}

.phone-screen-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.hero-mockup-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero-trust-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.trust-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid var(--bg-surface-border);
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
}

/* ==========================================================================
   Component: Calculator Section
   ========================================================================== */
.calculator-section {
  padding-top: 60px;
  padding-bottom: 80px;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 40px auto;
}

.section-header h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin-bottom: 12px;
}

.calculator-container {
  max-width: 600px;
  margin: 0 auto;
}

.tab-container {
  display: flex;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--bg-surface-border);
  padding: 6px;
  border-radius: 12px;
  margin-bottom: 24px;
  gap: 6px;
}

.tab-btn {
  flex: 1;
  padding: 10px 16px;
  min-height: 48px;
  touch-action: manipulation;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:active {
  transform: scale(0.97);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--accent-teal);
  color: #0B0F19;
  box-shadow: 0 2px 10px rgba(45, 212, 191, 0.3);
}

.calc-input {
  width: 100%;
  padding: 12px 16px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--bg-surface-border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: 'Inter', sans-serif;
  transition: border-color 0.2s ease;
}

.calc-input:focus {
  outline: none;
  border-color: var(--accent-teal);
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.input-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

/* Calculator Dynamic CTA */
.calc-cta-box {
  margin-top: 24px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.08) 0%, rgba(15, 23, 42, 0.75) 100%);
  border: 1px solid rgba(45, 212, 191, 0.3);
  border-radius: 14px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.calc-cta-text {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  margin: 0;
}

.calc-cta-btn {
  width: 100%;
  max-width: 520px;
  font-size: 0.95rem;
  padding: 12px 20px;
  font-weight: 700;
  text-align: center;
}

/* ==========================================================================
   Component: Calculator Guide & Aerobic Base Section
   ========================================================================== */
.calculator-guide {
  padding-top: 20px;
  padding-bottom: 80px;
}

.guide-methods-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}

.guide-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

.guide-card-header {
  margin-bottom: 12px;
}

.guide-badge {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 20px;
  background: rgba(45, 212, 191, 0.12);
  color: var(--accent-teal);
  margin-bottom: 8px;
  border: 1px solid rgba(45, 212, 191, 0.25);
}

.guide-card h3 {
  font-size: 1.25rem;
  color: var(--text-primary);
}

.guide-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
  overflow-wrap: break-word;
}

.guide-points {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.guide-points li {
  position: relative;
  padding-left: 18px;
  line-height: 1.5;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

.guide-points li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent-teal);
  font-size: 1.2rem;
  line-height: 1;
  top: -1px;
}

.guide-points strong {
  color: var(--text-primary);
}

.guide-points code {
  background: rgba(45, 212, 191, 0.1);
  color: var(--accent-teal);
  padding: 2px 6px;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  border: 1px solid rgba(45, 212, 191, 0.25);
  white-space: normal;
  word-break: break-word;
  display: inline-block;
  margin: 2px 0;
}

.guide-points sub {
  font-size: 0.75em;
  vertical-align: sub;
}

/* Zone 2 Deep Dive Card */
.zone2-guide-card {
  padding: 32px;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.06) 0%, rgba(15, 23, 42, 0.7) 100%);
  border: 1px solid rgba(76, 175, 80, 0.25);
}

.zone2-header {
  margin-bottom: 20px;
}

.zone2-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 20px;
  background: rgba(76, 175, 80, 0.15);
  color: #4CAF50;
  margin-bottom: 10px;
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.zone2-header h3 {
  font-size: 1.45rem;
  color: var(--text-primary);
}

.zone2-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.zone2-col h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.zone2-col p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.zone2-benefits {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.zone2-benefits li {
  position: relative;
  padding-left: 20px;
  line-height: 1.5;
}

.zone2-benefits li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #4CAF50;
  font-size: 0.9rem;
  font-weight: 700;
}

.zone2-benefits strong {
  color: var(--text-primary);
}

.zone2-practical h3 {
  font-size: 1.05rem;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.zone2-tips {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.zone2-tip-box {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--bg-surface-border);
  border-radius: 10px;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.zone2-tip-box strong {
  color: var(--text-primary);
}

.zone2-tip-box .tip-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  line-height: 1.2;
}

/* Mobile Sticky Download Bar Base (Hidden on Desktop) */
.mobile-sticky-bar {
  display: none;
}

/* ==========================================================================
   Component: Features Section
   ========================================================================== */
.features-section {
  padding-top: 60px;
  padding-bottom: 80px;
}

.feature-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-icon {
  font-size: 2rem;
  line-height: 1;
}

.feature-card h3 {
  font-size: 1.2rem;
}

/* ==========================================================================
   Component: Screenshots Showcase Section
   ========================================================================== */
.screenshots-section {
  padding-top: 60px;
  padding-bottom: 80px;
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.screenshot-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
}

.screenshot-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-top: 6px;
}

.screenshot-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.carousel-indicators {
  display: none;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
}

.indicator-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  border: none;
  padding: 0;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.3s ease, width 0.3s ease;
}

.indicator-dot:hover {
  background: rgba(255, 255, 255, 0.5);
}

.indicator-dot.active {
  background: var(--accent-teal);
  width: 24px;
  border-radius: 12px;
}

@media (max-width: 900px) {
  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .screenshots-grid {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 16px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  .screenshots-grid::-webkit-scrollbar {
    display: none;
  }
  .screenshot-card {
    flex: 0 0 85%;
    scroll-snap-align: center;
  }
  .carousel-indicators {
    display: flex;
  }
}

/* ==========================================================================
   Component: Hardware Section
   ========================================================================== */
.hardware-section {
  padding-top: 60px;
  padding-bottom: 80px;
}

.hardware-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 900px) {
  .hardware-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.hardware-card {
  text-align: center;
  padding: 28px 24px;
}

.hardware-card .brand-name {
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.hardware-card .models {
  color: var(--accent-teal);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 10px;
}

/* ==========================================================================
   Component: Footer
   ========================================================================== */
.footer {
  padding-top: 40px;
  padding-bottom: 40px;
  border-top: 1px solid var(--bg-surface-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copy {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent-teal);
}

@media (max-width: 768px) {
  body {
    padding-top: env(safe-area-inset-top, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
  }

  .navbar {
    position: relative;
    flex-direction: column;
    gap: 16px;
  }

  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(11, 15, 25, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 16px 20px;
    border-bottom: 1px solid var(--bg-surface-border);
    border-radius: 0 0 16px 16px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    gap: 16px;
  }

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

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 0 16px;
    font-size: 1.05rem;
    font-weight: 600;
    width: 100%;
    border-radius: 8px;
  }

  .hero {
    display: flex;
    flex-direction: column-reverse;
    text-align: center;
    gap: 32px;
  }

  .hero-content {
    align-items: center;
  }

  .hero-cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn {
    width: 100%;
    min-height: 48px;
  }

  .hero-trust-pills {
    justify-content: center;
  }

  .phone-frame {
    max-width: 250px;
  }

  /* Section Spacing */
  .calculator-section,
  .features-section,
  .screenshots-section,
  .hardware-section {
    padding-top: 40px;
    padding-bottom: 48px;
  }

  .support-section {
    padding-top: 24px;
    padding-bottom: 48px;
  }

  .section-header {
    margin-bottom: 24px;
  }

  /* 2-Column Mobile Features Grid */
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .feature-card {
    padding: 16px 14px;
    gap: 8px;
  }

  .feature-icon {
    font-size: 1.5rem;
  }

  .feature-card h3 {
    font-size: 0.95rem;
  }

  .feature-card p {
    font-size: 0.8rem;
    line-height: 1.4;
  }

  /* Hardware Horizontal Scroll Strip */
  .hardware-grid {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 12px;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
  }

  .hardware-grid::-webkit-scrollbar {
    display: none;
  }

  .hardware-card {
    flex: 0 0 75%;
    scroll-snap-align: center;
  }

  /* Footer Touch Targets */
  .footer {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer-links {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .footer-links a {
    display: block;
    padding: 12px 0;
    min-height: 48px;
    line-height: 24px;
    text-align: center;
  }

  .privacy-card {
    padding: 24px 16px !important;
  }

  /* Calculator Guide & Aerobic Section Mobile Layout */
  .calculator-guide {
    padding-top: 24px;
    padding-bottom: 48px;
  }

  .guide-methods-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .zone2-guide-card {
    padding: 20px 16px;
  }

  .zone2-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* Mobile Sticky Download Bar */
  .mobile-sticky-bar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999;
    background: rgba(11, 15, 25, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--bg-surface-border);
    padding: 10px 16px;
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.6);
  }

  .mobile-sticky-content {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .mobile-sticky-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: contain;
    flex-shrink: 0;
  }

  .mobile-sticky-info {
    display: flex;
    flex-direction: column;
  }

  .mobile-sticky-title {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.2;
  }

  .mobile-sticky-tagline {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-teal);
    line-height: 1.2;
  }

  .mobile-sticky-btn {
    padding: 8px 16px;
    min-height: 38px;
    font-size: 0.88rem;
    font-weight: 700;
    white-space: nowrap;
    border-radius: 10px;
  }

  /* Body clearance for sticky footer on mobile */
  body {
    padding-bottom: calc(64px + env(safe-area-inset-bottom, 0px));
  }
}

/* ==========================================================================
   Component: Privacy Policy Page
   ========================================================================== */
.privacy-container {
  padding-top: 40px;
  padding-bottom: 80px;
}

.privacy-card {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px;
}

.privacy-header {
  border-bottom: 1px solid var(--bg-surface-border);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.privacy-header h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.last-updated {
  font-size: 0.9rem;
  color: var(--accent-teal);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.privacy-body section {
  margin-bottom: 32px;
}

.privacy-body h2 {
  font-size: 1.4rem;
  margin-bottom: 12px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.privacy-body h3 {
  font-size: 1.1rem;
  margin-top: 20px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.privacy-body p {
  margin-bottom: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.privacy-body ul {
  margin-left: 24px;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.privacy-body li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.privacy-table-wrapper {
  overflow-x: auto;
  margin: 16px 0 24px 0;
}

.policy-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--bg-surface-border);
}

.policy-table th,
.policy-table td {
  padding: 14px 18px;
  text-align: left;
  font-size: 0.95rem;
}

.policy-table th {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-weight: 600;
  border-bottom: 1px solid var(--bg-surface-border);
}

.policy-table td {
  background: rgba(15, 23, 42, 0.4);
  color: var(--text-muted);
  border-bottom: 1px solid var(--bg-surface-border);
}

.policy-table tr:last-child td {
  border-bottom: none;
}

.policy-table code,
.privacy-body code {
  background: rgba(45, 212, 191, 0.1);
  color: var(--accent-teal);
  padding: 2px 8px;
  border-radius: 6px;
  font-family: monospace;
  font-size: 0.9em;
  border: 1px solid rgba(45, 212, 191, 0.2);
}

/* ==========================================================================
   Component: Support Section
   ========================================================================== */
.support-section {
  padding-top: 40px;
  padding-bottom: 80px;
}

.support-card {
  text-align: center;
  padding: 48px 32px;
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.06) 0%, rgba(251, 191, 36, 0.06) 100%);
}

.support-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  line-height: 1;
}

.support-card h2 {
  font-size: 2rem;
  margin-bottom: 12px;
}

.support-cta {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.btn-kofi {
  background: linear-gradient(135deg, #FF5E5B, #FBBF24);
  color: #FFFFFF;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(255, 94, 91, 0.3);
}

.btn-kofi:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 94, 91, 0.5);
  color: #FFFFFF;
}