/* ==========================================================================
   Poop Tracker Landing - Round Two Design System & Tokens
   Refined brand identity: Pale mist-blue surfaces, ink-blue typography,
   single indigo accent, solid deep ink-blue download panel, truthful utility cards.
   Official self-hosted Manrope font with full semantic token coverage.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Typography: Self-hosted Official Manrope Variable Font
   Source: Google Fonts OFL Repository (https://github.com/google/fonts)
   Weights supported: 200 - 800 (Light, Regular, Medium, SemiBold, Bold, ExtraBold)
   -------------------------------------------------------------------------- */
@font-face {
  font-family: 'Manrope';
  src: url('assets/Manrope-Latin.woff2') format('woff2');
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}

:root {
  /* Typography Tokens with reliable CJK system fallbacks */
  --font-sans: 'Manrope', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Apple SD Gothic Neo", "Malgun Gothic", "Hiragino Kaku Gothic ProN", "Meiryo", "PingFang TC", "Microsoft JhengHei", Helvetica, Arial, sans-serif;

  /* Semantic Brand Colors */
  --color-canvas: #ffffff;
  --color-surface-soft: #f7f9fc;
  --reading-max: 65ch;
  --line-reading: 1.7;
  --color-media-stroke: rgba(20, 29, 46, 0.04);
  --color-graphic-stroke: rgba(0, 0, 0, 0.1);
  --color-hero: #eef3f9;               /* Misted pale blue / soft slate surface */
  --color-hero-border: #e2e8f2;
  --color-text: #141d2e;               /* Ink-blue / deep slate text (High contrast, AAA) */
  --color-muted: #4e5a70;              /* Balanced slate secondary text */
  --color-accent: #2447e8;             /* Single indigo/deep blue primary accent */
  --color-accent-hover: #1a37ba;
  --color-accent-active: #132c97;
  --color-accent-subtle: #edf2fe;      /* Subtle indigo tint for tags and icons */
  --color-on-accent: #ffffff;

  /* Muted Green for Bristol Scale Type Highlights (strictly for data consistency) */
  --color-badge-green: #2a7e4b;
  --color-badge-green-bg: #eaf6ee;

  /* Download Banner Panel (Solid Deep Ink-Blue & High Contrast Text) */
  --color-download-bg: #121929;
  --color-download-text: #ffffff;
  --color-download-text-secondary: #e2e8f0;
  --color-download-muted: #cbd5e1;
  --color-download-subinfo: #cbd5e1;   /* High contrast subinfo (> 11:1 on #121929) */

  /* Graphic & Plate Elements Tokens */
  --color-plate-hover: #e5edf7;
  --color-plate-grid: #cbd5e1;
  --color-plate-scale-dot: #cbd5e1;
  --color-plate-note-line: #cbd5e1;
  --color-card-border-hover: #cbd5e1;

  /* Layout & Boundaries */
  --color-border: #e4e8f0;
  --color-border-subtle: #edf1f7;
  --color-focus: #2447e8;

  /* Layout Dimensions (Desktop Calibrated) */
  --content-max: 1024px;
  --features-max: 1152px;
  --content-wide: 1216px;
  --content-extra: 1280px;
  --header-max: 1280px;

  /* Corner Radii */
  --radius-control: 8px;
  --radius-card: 16px;
  --radius-panel: 24px;
  --radius-hero: 48px;
  --radius-phone: 36px;

  /* Sizing & Durations */
  --control-min: 44px;
  --duration: 250ms;

  /* Spacing Scale */
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-64: 64px;
  --space-80: 80px;
  --space-96: 96px;
  --space-112: 112px;

  /* Type Scale */
  --font-11: 11px;
  --font-12: 12px;
  --font-14: 14px;
  --font-15: 15px;
  --font-16: 16px;
  --font-18: 18px;
  --font-20: 20px;
  --font-24: 24px;
  --font-28: 28px;
  --font-36: 36px;
  --font-48: 48px;

  /* Line Heights */
  --line-base: 20px;
  --line-body: 1.55;
  --line-h1-desktop: 55px;  /* 48px heading, ~1.14 line-height ratio */
  --line-h1-mobile: 40px;   /* 36px heading, 40px line-height */

  /* Shadows & Semantic Surfaces */
  --shadow-phone: 0 16px 36px -8px rgba(20, 29, 46, 0.14), 0 4px 12px rgba(20, 29, 46, 0.05);
  --shadow-card: 0 4px 20px rgba(20, 29, 46, 0.05);
  --shadow-card-hover: 0 8px 28px rgba(20, 29, 46, 0.09);
  --shadow-banner-panel: 0 8px 24px rgba(18, 25, 41, 0.12);
  --border-banner-panel: 1px solid rgba(255, 255, 255, 0.08);
}

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

html {
  color-scheme: light;
  background-color: var(--color-canvas);
  overflow-x: clip;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-16);
  line-height: var(--line-body);
  color: var(--color-text);
  background-color: var(--color-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  width: 100%;
}

body.menu-open {
  overflow: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration) ease, background-color var(--duration) ease, border-color var(--duration) ease, opacity var(--duration) ease;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Accessibility & Focus-Visible
   ========================================================================== */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-16);
  background-color: var(--color-accent);
  color: var(--color-on-accent);
  padding: var(--space-12) var(--space-16);
  border-radius: var(--radius-control);
  font-weight: 600;
  font-size: var(--font-14);
  z-index: 2000;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-16);
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

/* ==========================================================================
   Buttons & Badges
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--control-min);
  border-radius: var(--radius-control);
  font-family: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color var(--duration) ease, transform var(--duration) ease, box-shadow var(--duration) ease;
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn-header {
  background-color: var(--color-canvas);
  color: var(--color-text);
  border-color: var(--color-border);
  padding: var(--space-8) var(--space-20);
  font-size: var(--font-14);
}

.btn-header:hover {
  background-color: var(--color-hero);
  border-color: var(--color-card-border-hover);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-on-accent);
  padding: var(--space-12) var(--space-24);
  font-size: var(--font-16);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
}

/* Official Apple App Store Badge Wrapper (min 44px touch target) */
.badge-appstore-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--control-min);
  text-decoration: none;
  transition: opacity var(--duration) ease, transform var(--duration) ease;
}

.badge-appstore-link:hover {
  opacity: 0.92;
}

.badge-appstore-link:active {
  transform: translateY(1px);
}

.badge-appstore-img {
  width: 120px;
  height: 40px;
  display: block;
}

/* Banner Badge specifics */
.badge-banner-img {
  width: 135px;
  height: 45px;
}

/* ==========================================================================
   Module 1: Sticky Header (Height: 72px desktop, padding: 0 32px)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-border);
  z-index: 500;
}

.header-container {
  width: 100%;
  max-width: 100%;
  height: 100%;
  padding: 0 var(--space-32);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-10);
  min-height: var(--control-min);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-control);
  object-fit: cover;
  flex-shrink: 0;
}

.brand-name {
  font-size: var(--font-18);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.015em;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: var(--space-32);
  margin-left: var(--space-32);
  margin-right: auto;
}

.nav-link {
  font-size: var(--font-15);
  font-weight: 500;
  color: var(--color-muted);
  min-height: var(--control-min);
  display: inline-flex;
  align-items: center;
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link.nav-active {
  color: var(--color-accent);
  font-weight: 600;
}

.header-action {
  display: flex;
  align-items: center;
}

/* Mobile Hamburger Button */
.btn-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 10px;
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
}

/* Mobile Full-Screen Menu Overlay */
.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  max-height: 100vh;
  background-color: var(--color-canvas);
  z-index: 1000;
  display: none;
  flex-direction: column;
  padding: var(--space-16) var(--space-20) var(--space-32);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-menu-overlay.is-open {
  display: flex;
}

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 56px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-12);
}

.btn-menu-close {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-20);
  padding: var(--space-32) 0;
}

.mobile-nav-link {
  font-size: var(--font-18);
  font-weight: 600;
  color: var(--color-text);
  min-height: var(--control-min);
  display: inline-flex;
  align-items: center;
}

.mobile-menu-cta {
  margin-top: var(--space-16);
  width: 100%;
  text-align: center;
}

/* ==========================================================================
   Module 2: Hero Section - Shared Base & Entrance Animation
   Signature moment: two overlapping real app screens on misted blue surface
   Non-blocking subtle entrance animation with full accessibility support.
   ========================================================================== */
.hero-section {
  width: 100%;
  background-color: var(--color-canvas);
}

@keyframes heroPhoneEntrance {
  0% {
    opacity: 0.85;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.phone-card {
  background-color: var(--color-canvas);
  border-radius: var(--radius-phone);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-phone);
  overflow: hidden;
  animation: heroPhoneEntrance 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.phone-rear {
  animation-delay: 0.05s;
}

.phone-front {
  animation-delay: 0.15s;
}

.phone-screen {
  border-radius: calc(var(--radius-phone) - var(--space-8));
  overflow: hidden;
  line-height: 0;
  background-color: var(--color-canvas);
}

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

.hero-cta-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-12);
}

.hero-density-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.density-primary {
  font-size: var(--font-12);
  font-weight: 600;
  color: var(--color-text);
  line-height: 16px;
}

.density-secondary {
  font-size: var(--font-12);
  color: var(--color-muted);
  line-height: 16px;
}

/* ==========================================================================
   Desktop-Specific Layout (min-width: 1200px)
   Matches reference-a measurements precisely:
   - Panel: x: 200.5, top: 216px, width: 1024px, height: 436px
   - Media: top: 136px (80px above panel top, 64px below 72px header)
   - Caption: absolute positioned 16px below lowest phone edge without stretching panel
   - Content: x: 744.5 (left: 544px in panel), width: 384px
   ========================================================================== */
@media (min-width: 1200px) {
  .hero-section {
    padding-top: var(--space-112);
    padding-bottom: 80px;
  }

  .hero-outer-container {
    width: var(--content-max);
    margin: 0 auto;
    padding: 0;
  }

  .hero-panel {
    position: relative;
    width: var(--content-max);
    height: 436px;
    background-color: var(--color-hero);
    border-radius: var(--radius-hero);
    overflow: visible;
    margin: 0 auto;
    border: 1px solid var(--color-hero-border);
  }

  /* Desktop Media: absolute positioned 80px above panel top (top: 136px) */
  .hero-media {
    position: absolute;
    left: 24px;
    top: -80px;
    width: 416px;
    height: 568px;
    z-index: 10;
  }

  .phones-stage {
    position: relative;
    width: 416px;
    height: 548px;
  }

  .phone-rear {
    position: absolute;
    left: 12px;
    top: 0;
    width: 215px;
    padding: var(--space-8);
    z-index: 1;
  }

  .phone-front {
    position: absolute;
    left: 175px;
    top: 64px;
    width: 232px;
    padding: var(--space-8);
    z-index: 2;
  }

  /* Desktop Caption: absolutely positioned 16px below lowest phone edge */
  .media-caption {
    position: absolute;
    top: 564px;
    left: 0;
    width: 100%;
    text-align: center;
    font-size: var(--font-12);
    color: var(--color-muted);
    line-height: 16px;
    margin: 0;
    pointer-events: none;
  }

  /* Desktop Content: absolute positioning at x: 744.5 (left: 544px), width: 384px */
  .hero-content {
    position: absolute;
    left: 544px;
    top: 50%;
    transform: translateY(-50%);
    width: 384px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-content h1 {
    font-size: var(--font-48);
    line-height: var(--line-h1-desktop);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.025em;
    margin-bottom: var(--space-16);
    max-width: 384px;
  }

  .hero-subtext {
    font-size: var(--font-18);
    line-height: 28px;
    color: var(--color-muted);
    margin-bottom: var(--space-24);
    max-width: 384px;
  }

  /* Feature Columns (Module 3) */
  .features-section {
    width: 100%;
    padding-top: var(--space-96);
    padding-bottom: var(--space-80);
    background-color: var(--color-canvas);
  }

  .features-container {
    width: var(--features-max);
    margin: 0 auto;
    padding: 0;
  }

  .features-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    justify-content: space-between;
    gap: var(--space-48);
    text-align: center;
  }

  /* Details / Utility Cards (Module 4) */
  .testimonials-container {
    position: relative;
    width: var(--content-wide);
    margin: 0 auto;
    padding: 0 var(--space-24);
    z-index: 1;
  }

  .testimonials-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-24);
    align-items: stretch;
  }

  /* Banner (Module 5) */
  .cta-banner-container {
    width: var(--content-max);
    margin: 0 auto;
    padding: 0;
  }

  .cta-banner-panel {
    width: 1024px;
    height: 400px;
    margin: 0 auto;
  }

  /* Guides (Module 6) */
  .guides-container {
    width: var(--content-wide);
    margin: 0 auto;
    padding: 0;
  }

  .guides-grid {
    display: grid;
    grid-template-columns: repeat(3, 384px);
    gap: var(--space-32);
    justify-content: space-between;
  }

  .guide-card {
    width: 384px;
  }
}

/* ==========================================================================
   Tablet & Mobile Responsive Stack (max-width: 1199px)
   - Eliminates clipping on 861px tablet with fluid wrapping & responsive sizing
   - Mobile: mist-blue pseudo-element ends 180px early so phones stick out naturally
   ========================================================================== */
@media (max-width: 1199px) {
  .desktop-nav {
    display: none;
  }

  .desktop-only {
    display: none !important;
  }

  .btn-hamburger {
    display: flex;
  }

  .site-header .header-container {
    padding: 0 var(--space-16);
  }

  /* Hero Section */
  .hero-section {
    padding-top: var(--space-24);
    padding-bottom: var(--space-48);
  }

  .hero-outer-container {
    width: 100%;
    max-width: 768px;
    padding: 0 var(--space-16);
    margin: 0 auto;
  }

  /* Misted blue panel with ::before stopping 180px early, phones protruding */
  .hero-panel {
    position: relative;
    background-color: transparent;
    border-radius: var(--radius-phone);
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    padding: var(--space-40, 40px) var(--space-20) 0 var(--space-20);
    text-align: center;
    overflow: visible;
  }

  .hero-panel::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 180px; /* Panel background stops 180px before container bottom */
    background-color: var(--color-hero);
    border-radius: var(--radius-phone);
    border: 1px solid var(--color-hero-border);
    z-index: 0;
  }

  .hero-content {
    position: relative;
    z-index: 1;
    order: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 0 var(--space-24) 0;
  }

  .hero-content h1 {
    font-size: var(--font-36);
    line-height: var(--line-h1-mobile);
    max-width: 100%;
    margin-bottom: var(--space-12);
    text-align: center;
    letter-spacing: -0.02em;
  }

  .hero-subtext {
    font-size: var(--font-16);
    line-height: 24px;
    max-width: 100%;
    margin-bottom: var(--space-24);
    text-align: center;
  }

  .hero-cta-block {
    align-items: center;
  }

  /* Hero Media below content on mobile/tablet */
  .hero-media {
    position: relative;
    z-index: 1;
    order: 2;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .phones-stage {
    position: relative;
    width: 280px;
    max-width: 100%;
    height: 352px;
    margin: 0 auto;
  }

  .phone-rear {
    position: absolute;
    left: 10px;
    right: auto;
    top: 0;
    width: 135px;
    padding: var(--space-4);
    border-radius: var(--space-24);
    z-index: 1;
  }

  .phone-rear .phone-screen {
    border-radius: calc(var(--space-24) - var(--space-4));
  }

  .phone-front {
    position: absolute;
    left: 135px;
    right: auto;
    top: 24px;
    width: 145px;
    padding: var(--space-4);
    border-radius: var(--space-24);
    z-index: 2;
  }

  .phone-front .phone-screen {
    border-radius: calc(var(--space-24) - var(--space-4));
  }

  .media-caption {
    margin-top: var(--space-16);
    font-size: var(--font-12);
    color: var(--color-muted);
    text-align: center;
  }

  /* Fluid Features Section */
  .features-section {
    padding-top: var(--space-48);
    padding-bottom: var(--space-48);
  }

  .features-container {
    width: 100%;
    max-width: 1000px;
    padding: 0 var(--space-16);
    margin: 0 auto;
  }

  .features-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-48);
  }

  /* Fluid Utility Cards Section */
  .testimonials-section {
    padding-top: var(--space-48);
    padding-bottom: var(--space-48);
  }

  .testimonials-container {
    width: 100%;
    padding: 0 var(--space-16);
  }

  .testimonials-header h2 {
    font-size: var(--font-28);
    line-height: var(--line-h1-mobile);
  }

  .testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-16);
  }

  /* Fluid Banner */
  .cta-banner-container {
    width: 100%;
    padding: 0 var(--space-16);
  }

  .cta-banner-panel {
    width: 100%;
    height: auto;
    min-height: 320px;
    padding: var(--space-48) var(--space-20);
  }

  .cta-banner-panel h2 {
    font-size: var(--font-28);
    line-height: var(--line-h1-mobile);
  }

  /* Fluid Guides */
  .guides-container {
    width: 100%;
    padding: 0 var(--space-16);
  }

  .guides-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 384px));
    gap: var(--space-32);
    justify-content: center;
  }

  .guide-card {
    width: 100%;
    max-width: 384px;
  }

  /* Fluid Footer */
  .footer-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-16);
    padding: 0 var(--space-16);
  }

  .footer-nav {
    justify-content: center;
    gap: var(--space-16);
  }
}

/* Small Viewport (320px) Safety */
@media (max-width: 350px) {
  .hero-panel {
    padding: var(--space-32) var(--space-12) 0 var(--space-12);
  }

  .hero-panel::before {
    bottom: 140px;
  }

  .phones-stage {
    width: 240px;
    height: 295px;
  }

  .phone-rear {
    left: 5px;
    width: 115px;
  }

  .phone-front {
    left: 110px;
    width: 125px;
    top: 20px;
  }

  .feature-col,
  .feature-image-wrapper {
    width: 280px;
    height: 280px;
  }
}

/* ==========================================================================
   Module 3: Feature Columns Shared Styles
   Consistent pale mist-blue background cards, deliberate crops focusing on
   Bristol log / History / Notes. Clean typography, stable reading order.
   ========================================================================== */
.feature-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 320px;
  text-align: left;
}

.feature-image-wrapper {
  width: 320px;
  height: 320px;
  border-radius: var(--radius-panel);
  overflow: hidden;
  background-color: var(--color-hero);
  border: 1px solid var(--color-border);
  box-shadow: 0 8px 24px var(--color-media-stroke);
  margin-bottom: var(--space-24);
}

.feature-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration) ease;
}

/* Feature screenshots explain the product; they are not interactive controls. */

.feature-img-record {
  object-position: 50% 35%;
}

.feature-img-history {
  object-position: 50% 20%;
}

/* Focused pattern & note card in center */
.feature-img-patterns {
  object-position: center 42%;
}

.feature-title {
  font-size: var(--font-20);
  line-height: 28px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-8);
  letter-spacing: -0.01em;
}

.feature-desc {
  font-size: var(--font-16);
  line-height: var(--line-body);
  color: var(--color-muted);
  max-width: 34ch;
}

/* ==========================================================================
   Module 4: Utility Cards ("Small details. A clearer picture.")
   Replaces fake reviews/ratings with honest, high-density product facts:
   Stool type, Date and time, Personal notes, Your history.
   ========================================================================== */
.testimonials-section {
  position: relative;
  width: 100%;
  background-color: var(--color-canvas);
  overflow: hidden;
}

.testimonials-header {
  text-align: left;
  margin-bottom: var(--space-32);
}

.testimonials-header h2 {
  font-size: var(--font-28);
  line-height: var(--line-h1-mobile);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-12);
}

.testimonials-notice {
  font-size: var(--font-16);
  color: var(--color-muted);
  max-width: var(--reading-max);
  margin: 0;
  line-height: var(--line-body);
}

.utility-card {
  background-color: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-24);
  display: flex;
  flex-direction: column;
}

.utility-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-20);
}

.utility-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background-color: var(--color-accent-subtle);
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.utility-tag {
  display: none; /* Decorative labels duplicate each card heading. */
  font-size: var(--font-11);
  font-weight: 700;
  color: var(--color-text);
  background-color: var(--color-hero);
  border: 1px solid var(--color-hero-border);
  padding: 3px 8px;
  border-radius: 6px;
  letter-spacing: 0.02em;
}

.utility-title {
  font-size: var(--font-18);
  line-height: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-8);
  letter-spacing: -0.01em;
}

.utility-desc {
  font-size: var(--font-14);
  line-height: 22px;
  color: var(--color-muted);
}

/* ==========================================================================
   Module 5: Download Banner Shared Styles
   Solid deep ink-blue panel with concentrated saturation, high contrast text
   ========================================================================== */
.cta-banner-section {
  width: 100%;
  padding-top: var(--space-64);
  padding-bottom: var(--space-64);
  background-color: var(--color-canvas);
}

.cta-banner-panel {
  background-color: var(--color-download-bg);
  border-radius: var(--radius-panel);
  padding: var(--space-64) var(--space-32);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow-banner-panel);
  border: var(--border-banner-panel);
}

.cta-banner-panel h2 {
  font-size: var(--font-36);
  line-height: var(--line-h1-mobile);
  font-weight: 700;
  color: var(--color-download-text);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-16);
}

.cta-banner-text {
  font-size: var(--font-18);
  line-height: 28px;
  color: var(--color-download-text-secondary);
  margin-bottom: var(--space-32);
  max-width: 580px;
}

.cta-banner-action {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-12);
}

.cta-banner-subinfo {
  font-size: var(--font-12);
  color: var(--color-download-subinfo);
  line-height: 16px;
}

/* ==========================================================================
   Module 6: Content Library Shared Styles
   Planar graphic compositions instead of repeating giant screenshots.
   Direct links to guides.html#record, #history, #notes.
   ========================================================================== */
.guides-section {
  width: 100%;
  padding-top: var(--space-64);
  padding-bottom: var(--space-80);
  background-color: var(--color-canvas);
}

.guides-header {
  margin-bottom: var(--space-32);
}

.guides-header h2 {
  font-size: var(--font-24);
  line-height: 32px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.guide-card {
  display: flex;
  flex-direction: column;
}

.guide-card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.guide-image-wrapper {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--space-12);
  overflow: hidden;
  background-color: var(--color-hero);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-16);
  position: relative;
}

/* Planar Graphic Plates for Guides */
.guide-graphic-plate {
  width: 100%;
  height: 100%;
  padding: var(--space-20);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: var(--color-hero);
  transition: background-color var(--duration) ease;
}

.guide-card-link:hover .guide-graphic-plate {
  background-color: var(--color-plate-hover);
}

.plate-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.plate-badge {
  font-size: var(--font-11);
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-canvas);
  border: 1px solid var(--color-hero-border);
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.plate-code {
  font-size: var(--font-11);
  font-weight: 600;
  color: var(--color-muted);
}

.plate-caption {
  font-size: var(--font-12);
  font-weight: 500;
  color: var(--color-muted);
}

/* Plate Record: 7 Bristol Scale Dots */
.plate-scale-visual {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-8) 0;
  gap: 8px;
}

.scale-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-plate-scale-dot);
  border: 2px solid var(--color-canvas);
  box-shadow: 0 1px 3px var(--color-graphic-stroke);
}

.scale-dot.active-dot {
  width: 22px;
  height: 22px;
  background-color: var(--color-badge-green);
  box-shadow: 0 0 0 3px var(--color-badge-green-bg);
}

/* Plate History: Equal-size Date Sequence (Non-numeric, factual date grid) */
.plate-history-visual {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  padding: 0 var(--space-8);
  gap: 8px;
}

.date-seq-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.date-seq-cell span {
  font-size: 10px;
  color: var(--color-muted);
  font-weight: 600;
}

.date-block {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background-color: var(--color-plate-grid);
  border: 1px solid var(--color-hero-border);
}

.date-block.date-block-logged {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Plate Notes: Structured habit lines */
.plate-notes-visual {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: var(--space-4) 0;
}

.plate-note-pill {
  align-self: flex-start;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text);
  background-color: var(--color-canvas);
  border: 1px solid var(--color-hero-border);
  padding: 4px 10px;
  border-radius: 12px;
}

.plate-note-line {
  height: 6px;
  background-color: var(--color-plate-note-line);
  border-radius: 3px;
  width: 85%;
}

.plate-note-line.line-short {
  width: 55%;
}

.guide-title {
  font-size: var(--font-18);
  line-height: 26px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  transition: color var(--duration) ease;
}

.guide-card-link:hover .guide-title {
  color: var(--color-accent);
}

.guide-author {
  font-size: var(--font-12);
  color: var(--color-muted);
  margin-bottom: var(--space-8);
}

.guide-excerpt {
  font-size: var(--font-14);
  line-height: 22px;
  color: var(--color-muted);
  margin-bottom: var(--space-12);
}

.guide-category {
  font-size: var(--font-11);
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: auto;
}

.guides-footer-action {
  margin-top: var(--space-16);
}

.link-view-all {
  font-size: var(--font-16);
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
}

.link-view-all:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* ==========================================================================
   Module 7: Footer Shared Styles
   ========================================================================== */
.site-footer {
  width: 100%;
  background-color: var(--color-canvas);
  border-top: 1px solid var(--color-border);
  padding: var(--space-24) 0;
}

.footer-container {
  width: 100%;
  max-width: 100%;
  padding: 0 var(--space-32);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-24);
  flex-wrap: wrap;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: var(--space-10);
}

.footer-icon {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  object-fit: cover;
}

.footer-copy {
  font-size: var(--font-12);
  color: var(--color-muted);
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: var(--space-24);
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: var(--font-14);
  color: var(--color-muted);
  min-height: var(--control-min);
  display: inline-flex;
  align-items: center;
}

.footer-nav a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ==========================================================================
   Guides Detail Page Styles (guides.html)
   ========================================================================== */
.guides-detail-main {
  width: 100%;
  padding-top: var(--space-48);
  padding-bottom: var(--space-112);
  background-color: var(--color-canvas);
}

.guides-detail-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--space-24);
}

.guides-page-header {
  margin-bottom: var(--space-48);
}

.back-link {
  font-size: var(--font-14);
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-16);
  display: inline-block;
  min-height: var(--control-min);
  display: inline-flex;
  align-items: center;
}

.back-link:hover {
  text-decoration: underline;
}

.guides-page-header h1 {
  font-size: var(--font-36);
  line-height: var(--line-h1-mobile);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-16);
  letter-spacing: -0.02em;
}

.guides-intro {
  font-size: var(--font-18);
  line-height: 28px;
  color: var(--color-muted);
}

.guide-article-item {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-32);
  margin-bottom: var(--space-48);
}

.guide-item-meta {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.guide-article-item h2 {
  font-size: var(--font-24);
  line-height: 32px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-16);
  letter-spacing: -0.01em;
}

.guide-article-content p {
  font-size: var(--font-16);
  line-height: var(--line-reading);
  color: var(--color-text);
  max-width: var(--reading-max);
  margin-bottom: var(--space-16);
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  a,
  button,
  .btn,
  .nav-link,
  .brand-link,
  .skip-link,
  .guide-cover,
  .badge-appstore-link,
  .utility-card,
  .feature-img,
  .phone-card {
    transition: none !important;
    animation: none !important;
  }

  html {
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   Coordinator Integration: Constrain Narrow-Screen & Tablet Grids
   ========================================================================== */
.feature-col {
  width: min(320px, 100%);
  min-width: 0;
  height: auto;
}

.feature-image-wrapper {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
}

@media (max-width: 350px) {
  .guides-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1200px) {
  .testimonials-container,
  .guides-container {
    max-width: calc(100% - var(--space-64));
  }
  .guides-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .guide-card {
    width: 100%;
  }
}

/* Refactoring UI: one reading grid, distinct grouping, usable long content. */
.hero-content h1,
.testimonials-header h2,
.cta-banner-panel h2,
.guide-title { text-wrap: balance; }
.hero-subtext, .feature-desc, .guide-excerpt { text-wrap: pretty; }
.hero-content h1 { font-weight: 700; }
.guide-article-content :is(ol, ul) {
  padding-left: var(--space-24);
  margin-bottom: var(--space-24);
  font-size: var(--font-16);
  line-height: var(--line-reading);
}
.guide-article-content li + li { margin-top: var(--space-8); }
.guide-article-content a { color: var(--color-accent); text-decoration: underline; }
@media (min-width: 1200px) {
  .testimonials-container, .guides-container {
    width: var(--features-max);
    max-width: calc(100% - var(--space-64));
    padding-inline: 0;
  }
  .feature-col { width: 100%; }
  .guides-grid { gap: var(--space-48); }
}
@media (max-width: 1199px) {
  .hero-subtext { max-width: 42ch; color: var(--color-muted); }
  .hero-content h1 { max-width: 18ch; }
  .testimonials-container, .guides-container { max-width: 720px; margin-inline: auto; }
  .cta-banner-panel h2, .testimonials-header h2 { font-size: var(--font-28); line-height: 1.25; }
  .features-section { padding-top: var(--space-24); }
  .testimonials-section { padding-top: var(--space-32); padding-bottom: var(--space-24); }
  .guides-section { padding-top: var(--space-32); }
  .cta-banner-section { padding-block: var(--space-48); }
  .guide-card { max-width: 100%; }
  .guides-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (min-width: 600px) and (max-width: 1199px) {
  .guides-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* Keep anchored guide headings below the sticky navigation. */
main :is(section, article)[id] { scroll-margin-top: var(--space-96); }

/* Keep each short hero sentence together when its available width allows it. */
.hero-content h1 span { display: block; }
@media (min-width: 1200px) {
  .hero-content { left: 528px; width: 432px; }
  .hero-content h1 { max-width: 432px; font-size: var(--font-48); }
}

/* ==========================================================================
   Language Selector Styles (Accessible Native Details Dropdown & Mobile Grid)
   ========================================================================== */
.lang-picker {
  position: relative;
  display: inline-block;
}

.lang-summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-14);
  font-weight: 600;
  color: var(--color-text);
  background-color: var(--color-hero);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  cursor: pointer;
  list-style: none;
  min-height: var(--control-min);
  user-select: none;
  transition: background-color var(--duration) ease, border-color var(--duration) ease;
}

.lang-summary::-webkit-details-marker {
  display: none;
}

.lang-summary:hover {
  background-color: var(--color-plate-hover);
  border-color: var(--color-card-border-hover);
}

.lang-summary:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.lang-arrow {
  width: 12px;
  height: 12px;
  transition: transform var(--duration) ease;
  color: var(--color-muted);
}

.lang-picker[open] .lang-arrow {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background-color: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  box-shadow: 0 10px 28px rgba(20, 29, 46, 0.12);
  padding: var(--space-8) 0;
  min-width: 140px;
  z-index: 600;
  list-style: none;
}

.lang-option-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-8) var(--space-16);
  font-size: var(--font-14);
  color: var(--color-text);
  min-height: 40px;
  text-decoration: none;
  transition: background-color var(--duration) ease, color var(--duration) ease;
}

.lang-option-link:hover {
  background-color: var(--color-hero);
  color: var(--color-accent);
}

.lang-option-link[aria-current="true"] {
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

/* Mobile Language Section in Menu */
.mobile-lang-section {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-20);
  margin-top: var(--space-16);
}

.mobile-lang-title {
  font-size: var(--font-12);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  margin-bottom: var(--space-12);
}

.mobile-lang-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

@media (max-width: 340px) {
  .mobile-lang-grid {
    grid-template-columns: 1fr;
  }
}

.mobile-lang-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-10);
  font-size: var(--font-12);
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-hero);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  min-height: var(--control-min);
  text-decoration: none;
  text-align: center;
  transition: background-color var(--duration) ease, border-color var(--duration) ease;
}

.mobile-lang-link:hover {
  background-color: var(--color-plate-hover);
  border-color: var(--color-card-border-hover);
}

.mobile-lang-link[aria-current="true"] {
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
  border-color: var(--color-accent);
}

/* ==========================================================================
   Progressive Enhancement: Footer Language Selector (Always accessible, no JS required)
   ========================================================================== */
.footer-languages {
  width: 100%;
  padding-top: var(--space-16);
  margin-top: var(--space-16);
  border-top: 1px solid var(--color-border);
}

.footer-lang-title {
  font-size: var(--font-11);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  margin-bottom: var(--space-8);
}

.footer-lang-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6) var(--space-12);
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-lang-link {
  font-size: var(--font-12);
  color: var(--color-muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color var(--duration) ease, background-color var(--duration) ease;
}

.footer-lang-link:hover {
  color: var(--color-accent);
  background-color: var(--color-plate-hover);
}

.footer-lang-link[aria-current="true"] {
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

/* ==========================================================================
   Progressive Enhancement: Noscript Language Bar (Visible only when JS is disabled)
   ========================================================================== */
.noscript-lang-bar {
  background-color: var(--color-hero);
  border-bottom: 1px solid var(--color-hero-border);
  padding: var(--space-8) var(--space-16);
  font-size: var(--font-12);
}

.noscript-lang-container {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-8) var(--space-12);
}

.noscript-lang-label {
  font-weight: 600;
  color: var(--color-text);
}

.noscript-lang-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6) var(--space-10);
}

.noscript-lang-link {
  color: var(--color-text);
  text-decoration: none;
  padding: 2px 6px;
  border-radius: 4px;
  background-color: var(--color-canvas);
  border: 1px solid var(--color-border);
  min-height: 24px;
  display: inline-flex;
  align-items: center;
}

.noscript-lang-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.noscript-lang-link[aria-current="true"] {
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
  border-color: var(--color-accent);
}

/* ==========================================================================
   Desktop Hero Typography Safety (Prevent long translation overflow)
   ========================================================================== */
@media (min-width: 1200px) {
  html:is([lang="de"], [lang="fr"], [lang="es"]) .hero-content h1 {
    font-size: 40px;
    line-height: 1.15;
  }
}