/* ============================================
   CritCase — Clinical Editorial Design System
   ============================================ */

/* --- Custom Properties (Light) --- */
:root {
  --bg: #FAFAF7;
  --surface: #FFFFFF;
  --surface-raised: #FFFFFF;
  --text-1: #111827;
  --text-2: #6B7280;
  --text-3: #9CA3AF;
  --accent: #0D7377;
  --accent-hover: #0A5C5F;
  --accent-subtle: rgba(13, 115, 119, 0.07);
  --accent-border: rgba(13, 115, 119, 0.2);
  --border: rgba(17, 24, 39, 0.08);
  --border-strong: rgba(17, 24, 39, 0.15);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
  --success: #15803D;
  --success-bg: rgba(21, 128, 61, 0.08);
  --success-border: rgba(21, 128, 61, 0.2);
  --warning: #C2410C;
  --warning-bg: rgba(194, 65, 12, 0.08);
  --warning-border: rgba(194, 65, 12, 0.2);
  --critical: #B91C1C;
  --critical-bg: rgba(185, 28, 28, 0.08);
  --critical-border: rgba(185, 28, 28, 0.2);
  --monitor-bg: #0B1120;
  --ecg-green: #22C55E;
  --ecg-glow: rgba(34, 197, 94, 0.4);
  --font-serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
  --bg: #0C111D;
  --surface: #151C2C;
  --surface-raised: #1A2236;
  --text-1: #F3F4F6;
  --text-2: #9CA3AF;
  --text-3: #6B7280;
  --accent: #2DD4BF;
  --accent-hover: #5EEAD4;
  --accent-subtle: rgba(45, 212, 191, 0.08);
  --accent-border: rgba(45, 212, 191, 0.2);
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
  --success-bg: rgba(34, 197, 94, 0.1);
  --success-border: rgba(34, 197, 94, 0.25);
  --warning-bg: rgba(234, 88, 12, 0.1);
  --warning-border: rgba(234, 88, 12, 0.25);
  --critical-bg: rgba(220, 38, 38, 0.1);
  --critical-border: rgba(220, 38, 38, 0.25);
  --monitor-bg: #070B14;
}

/* --- Reset --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Skip Link (a11y) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  border-radius: 0 0 8px 8px;
  font-weight: 600;
  font-size: 0.875rem;
  z-index: 9999;
  text-decoration: none;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 0;
}

/* --- Focus --- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- Typography --- */
h1, h2, h3 { font-weight: 400; }
h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--text-1);
}
h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.2;
  color: var(--text-1);
}
h3 {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
}
p { color: var(--text-2); }
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }
[data-theme="dark"] a:hover { color: var(--accent); filter: brightness(1.2); }

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 2rem;
  background: transparent;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
}
.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}
.logo {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-1);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.625rem;
  letter-spacing: -0.02em;
}
.logo:hover { color: var(--text-1); }
.logo-mark {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, #0D7377 0%, #064D50 100%);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  font-family: var(--font-mono);
}
.logo-icon {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  object-fit: contain;
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}
.nav-links a {
  color: var(--text-2);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-1); }

/* Language switcher */
.lang-switcher {
  display: flex;
  gap: 2px;
  background: var(--border);
  border-radius: 6px;
  padding: 2px;
}
.lang-switcher a {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: var(--text-3);
  text-decoration: none;
  transition: all 0.2s;
}
.lang-switcher a:hover { color: var(--text-1); }
.lang-switcher a.active {
  background: var(--surface);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.2s;
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent-border);
  background: var(--accent-subtle);
}
.theme-toggle svg { width: 18px; height: 18px; }

/* Nav back link */
.nav-back {
  color: var(--text-2);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}
.nav-back:hover { color: var(--text-1); }

/* Language visibility */
.lang-no, .lang-en { display: none; }
html[lang="no"] .lang-no,
html[lang="en"] .lang-en { display: revert; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}
.btn-primary {
  background: linear-gradient(135deg, #0D7377 0%, #0A5C5F 100%);
  color: #fff;
  box-shadow: 0 2px 12px rgba(13, 115, 119, 0.3);
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(13, 115, 119, 0.4);
}
[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, #0D7377 0%, #14919B 100%);
}
.btn-secondary {
  background: var(--accent-subtle);
  color: var(--accent);
  border: 1px solid var(--accent-border);
}
.btn-secondary:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(13, 115, 119, 0.08) 0%, transparent 70%);
  pointer-events: none;
}
[data-theme="dark"] .hero::before {
  background: radial-gradient(ellipse, rgba(13, 115, 119, 0.15) 0%, transparent 70%);
}
.hero-inner {
  max-width: 1120px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.hero-content { position: relative; z-index: 1; }
.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}
.hero-label .pulse {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero h1 {
  margin-bottom: 1.25rem;
}
.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-2);
  margin-bottom: 2rem;
  max-width: 480px;
}
.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* --- Patient Monitor Visual --- */
.monitor {
  background: var(--monitor-bg);
  border-radius: 16px;
  padding: 1.25rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255,255,255,0.03);
  position: relative;
  overflow: hidden;
}
.monitor::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.06);
  pointer-events: none;
}
.monitor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.monitor-header-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.monitor-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ecg-green);
  box-shadow: 0 0 8px var(--ecg-glow);
  animation: pulse 1.2s ease-in-out infinite;
}
.monitor-title {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.4);
}
.monitor-id {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: rgba(255,255,255,0.25);
}

/* ECG Line */
.ecg-container {
  overflow: hidden;
  height: 64px;
  margin-bottom: 1.25rem;
  position: relative;
}
.ecg-container::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 60px;
  height: 100%;
  background: linear-gradient(to right, transparent, var(--monitor-bg));
  pointer-events: none;
}
.ecg-svg {
  width: 125%;
  height: 100%;
  animation: ecg-scroll 2.4s linear infinite;
}
.ecg-line {
  fill: none;
  stroke: var(--ecg-green);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 4px var(--ecg-glow));
}
@keyframes ecg-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-20%); }
}

/* Monitor Vitals Grid */
.monitor-vitals {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}
.vital {
  padding: 0.5rem;
  border-radius: 8px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.04);
}
.vital-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}
.vital-label.green { color: var(--ecg-green); }
.vital-label.cyan { color: #22D3EE; }
.vital-label.yellow { color: #FACC15; }
.vital-label.white { color: rgba(255,255,255,0.5); }
.vital-value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  color: #fff;
}
.vital-unit {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: rgba(255,255,255,0.3);
  margin-top: 0.25rem;
}

/* --- Stats Band --- */
.stats-band {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 3rem 2rem;
}
.stats-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}
.stat {
  text-align: center;
  flex: 1;
  position: relative;
}
.stat:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 40px;
  background: var(--border-strong);
}
.stat-number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: var(--text-1);
  line-height: 1;
  margin-bottom: 0.375rem;
}
.stat-label {
  font-size: 0.8125rem;
  color: var(--text-3);
  font-weight: 500;
}

/* --- Feature Sections --- */
.features {
  padding: 6rem 2rem;
  max-width: 1120px;
  margin: 0 auto;
}
.features-header {
  text-align: center;
  margin-bottom: 4rem;
}
.features-header .section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1rem;
}
.features-header h2 {
  max-width: 600px;
  margin: 0 auto;
}
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 3rem 0;
  border-top: 1px solid var(--border);
}
.feature-row:last-child {
  border-bottom: 1px solid var(--border);
}
.feature-row.reverse .feature-text { order: 2; }
.feature-row.reverse .feature-visual { order: 1; }
.feature-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-3);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}
.feature-text h3 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 400;
  margin-bottom: 0.75rem;
}
.feature-text p {
  font-size: 1rem;
  line-height: 1.7;
}
.feature-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-card {
  width: 100%;
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
}
.feature-card-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.25rem;
  margin-bottom: 1rem;
}
[data-theme="dark"] .feature-card-icon svg { color: var(--accent); }
.feature-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.feature-card p {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.6;
}
.feature-mini-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
.feature-mini-card {
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-align: center;
}
.feature-mini-card .icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}
.feature-mini-card span {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-2);
}

/* --- Download Section --- */
.download {
  padding: 6rem 2rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.download-inner {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}
.download-inner h2 {
  margin-bottom: 0.75rem;
}
.download-inner > p {
  color: var(--text-2);
  margin-bottom: 2.5rem;
  font-size: 1.0625rem;
}
.store-buttons {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}
.store-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-1);
  transition: all 0.2s;
}
.store-btn:hover {
  color: var(--text-1);
  border-color: var(--accent-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
[data-theme="dark"] .store-btn { background: var(--surface-raised); }
.store-btn svg { width: 24px; height: 24px; flex-shrink: 0; }
.store-text { text-align: left; }
.store-label {
  font-size: 0.6875rem;
  color: var(--text-3);
  line-height: 1.2;
}
.store-name {
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.3;
}

/* --- Footer --- */
.footer {
  padding: 3rem 2rem;
  max-width: 1120px;
  margin: 0 auto;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.footer-links {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.footer-links a {
  color: var(--text-3);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--text-1); }
.footer-sep { color: var(--text-3); font-size: 0.75rem; }
.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-3);
}
.footer-disclaimer {
  font-size: 0.75rem;
  color: var(--text-3);
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 2rem 2rem;
  text-align: center;
}

/* --- Document Pages (Privacy, Terms, etc.) --- */
.doc-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 7rem 2rem 4rem;
}
.doc-header { margin-bottom: 3rem; }
.doc-header h1 {
  margin-bottom: 0.5rem;
}
.doc-meta {
  font-size: 0.9rem;
  color: var(--text-3);
}
.doc-meta strong { color: var(--text-2); font-weight: 500; }

.doc-page h2 {
  margin-top: 3rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-1);
}
.doc-page h3 {
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}
.doc-page p {
  margin-bottom: 0.875rem;
  line-height: 1.75;
}
.doc-page ul, .doc-page ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  color: var(--text-2);
}
.doc-page li { margin-bottom: 0.375rem; line-height: 1.7; }
.doc-page a { text-decoration: underline; text-underline-offset: 2px; }
.doc-page a:hover { text-decoration-color: var(--accent); }

/* Document Tables */
.doc-page table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.doc-page th, .doc-page td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.doc-page th {
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-2);
  background: var(--accent-subtle);
}
.doc-page td {
  color: var(--text-2);
}
.doc-page thead tr { border-bottom: 2px solid var(--border-strong); }
.doc-page tbody tr:last-child td { border-bottom: none; }

/* Highlight Boxes */
.highlight-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border-strong);
  border-radius: 0 10px 10px 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.highlight-box p { margin-bottom: 0.5rem; }
.highlight-box p:last-child { margin-bottom: 0; }
.highlight-box strong { color: var(--text-1); }
.highlight-box ul { margin-bottom: 0; }
.highlight-box.success {
  border-left-color: var(--success);
  background: var(--success-bg);
}
.highlight-box.warning {
  border-left-color: var(--warning);
  background: var(--warning-bg);
}
.highlight-box.critical {
  border-left-color: var(--critical);
  background: var(--critical-bg);
}

/* Step Cards */
.step-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 0.75rem 0;
}
.step-number {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #0D7377, #0A5C5F);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  flex-shrink: 0;
}
.step-card strong { color: var(--text-1); font-size: 1rem; }
.step-card p { margin-top: 0.375rem; font-size: 0.9375rem; }
.step-card ul { margin-top: 0.5rem; }

/* --- 404 Page --- */
.not-found {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}
.not-found-inner { max-width: 460px; }
.not-found h1 {
  font-family: var(--font-serif);
  font-size: 7rem;
  line-height: 1;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--text-1) 0%, var(--text-3) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.not-found p {
  font-size: 1.0625rem;
  color: var(--text-2);
  margin-bottom: 2rem;
}

/* Challenge Page (shared with 404) */
.challenge { display: none; }
.challenge-logo-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  justify-content: center;
  margin-bottom: 1.5rem;
}
.challenge-logo-link img {
  flex-shrink: 0;
}
.challenge-logo {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.5rem;
  background: linear-gradient(135deg, #0D7377 0%, #14919B 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.challenge-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  margin: 0 auto 1.25rem;
  border-radius: 50%;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  color: var(--accent);
}
.challenge h1 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}
.challenge .subtitle {
  color: var(--text-2);
  margin-bottom: 2rem;
}
.code-box {
  background: var(--surface);
  border: 2px solid var(--accent);
  border-radius: 14px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}
.code-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 0.5rem;
}
.code-value {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--accent);
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 0.75rem;
}
.copy-btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn.copied { border-color: var(--success); color: var(--success); }
.challenge-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
  font-size: 0.8125rem;
  color: var(--text-3);
}
.challenge-divider::before,
.challenge-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}
.challenge-stores {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.store-btn-accent {
  background: linear-gradient(135deg, #0D7377 0%, #0A5C5F 100%);
  border-color: transparent;
  color: #fff;
}
.store-btn-accent:hover {
  color: #fff;
  box-shadow: 0 4px 20px rgba(13, 115, 119, 0.35);
  transform: translateY(-1px);
}
.store-btn-accent .store-label { color: rgba(255,255,255,0.7); }
.store-btn-accent .store-name { color: #fff; }
[data-theme="dark"] .store-btn-accent {
  background: linear-gradient(135deg, #0D7377 0%, #14919B 100%);
}
.challenge-instructions {
  margin-top: 2rem;
  padding: 1.25rem;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  border-radius: 12px;
  text-align: left;
}
.challenge-instructions h3 {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.challenge-instructions ol {
  padding-left: 1.25rem;
  color: var(--text-2);
  font-size: 0.875rem;
}
.challenge-instructions li { margin-bottom: 0.375rem; }
.challenge-instructions strong { color: var(--text-1); }

/* --- Responsive --- */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-label { justify-content: center; }
  .monitor { max-width: 500px; margin: 0 auto; }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .feature-row.reverse .feature-text { order: 1; }
  .feature-row.reverse .feature-visual { order: 2; }
  .monitor-vitals { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav { padding: 0 1rem; }
  .nav-links { display: none; }
  .hero { padding: 5rem 1.25rem 3rem; min-height: auto; }
  .features { padding: 4rem 1.25rem; }
  .stats-inner {
    flex-wrap: wrap;
    gap: 1.5rem;
  }
  .stat { min-width: 45%; }
  .stat::after { display: none; }
  .stat-number { font-size: 2rem; }
  .download { padding: 4rem 1.25rem; }
  .store-buttons { flex-direction: column; align-items: center; }
  .store-btn { width: 100%; max-width: 280px; justify-content: center; }
  .footer-inner {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }
  .doc-page { padding: 5.5rem 1.25rem 3rem; }
  .doc-page table { display: block; overflow-x: auto; }
  .vital-value { font-size: 1.125rem; }
}

/* --- Motion Preferences --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}