/* Circadian — Landing Page Styles */

/* --- Design Tokens --- */
:root {
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F7F8;
  --color-bg-card: #F3F4F6;
  --color-bg-card-hover: #E8E9EC;
  --color-text: #1A1A1A;
  --color-text-secondary: #6B7280;
  --color-orange: #FF7A00;
  --color-orange-soft: #FF9A33;
  --color-indigo: #4F46E5;
  --color-indigo-soft: #6366F1;
  --color-gradient-start: #FF7A00;
  --color-gradient-end: #4F46E5;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-nav-bg: rgba(255, 255, 255, 0.85);
  --color-nav-bg-solid: rgba(255, 255, 255, 0.97);
  --color-nav-shadow: rgba(0, 0, 0, 0.08);
  --color-overlay: rgba(0, 0, 0, 0.3);
  --color-hero-glow: rgba(255, 122, 0, 0.06);
  --color-card-shadow: rgba(0, 0, 0, 0.06);
  --color-card-border-hover: rgba(255, 122, 0, 0.25);
  --color-icon-orange-bg: rgba(255, 122, 0, 0.1);
  --color-icon-indigo-bg: rgba(79, 70, 229, 0.1);
  --color-science-gradient: rgba(255, 122, 0, 0.03);
  --color-source-border: rgba(79, 70, 229, 0.15);
  --color-sticky-bg: rgba(255, 255, 255, 0.92);
  --color-footer-copy: rgba(0, 0, 0, 0.3);
  --color-error: #c0392b;
  --color-consent-nudge: rgba(192, 57, 43, 0.08);
  --color-device-shadow: rgba(0, 0, 0, 0.15);
  --color-device-shadow-sm: rgba(0, 0, 0, 0.12);
  --color-svg-grid: rgba(0, 0, 0, 0.06);
  --color-svg-grid-light: rgba(0, 0, 0, 0.04);
  --color-shield-glow: rgba(99, 102, 241, 0.12);
  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --max-width: 960px;
  --spacing: 1.5rem;
  --radius: 16px;
  --transition: 0.3s ease;
}

/* --- 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-stack);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--color-orange);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-orange-soft);
}

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

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
}

section {
  padding: 5rem 0;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  background: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-brand svg {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.lang-group {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}

.lang-switch {
  font-size: 0.85rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.lang-switch:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.lang-switch.active {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
  pointer-events: none;
}

/* --- Hamburger Toggle (mobile) --- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
  z-index: 110;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 260px;
    height: 100vh;
    background: var(--color-nav-bg-solid);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: flex-start;
    padding: 5rem 2rem 2rem;
    gap: 1.25rem;
    transform: translateX(100%);
    transition: transform 0.35s ease;
    box-shadow: -4px 0 24px var(--color-nav-shadow);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.05rem;
  }

  .lang-group {
    flex-wrap: wrap;
  }

  .lang-switch {
    padding: 0.25rem 0.5rem;
  }

  .nav-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-overlay);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
  }

  .nav-overlay.visible {
    opacity: 1;
    pointer-events: auto;
  }
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 5rem;
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--color-orange), var(--color-orange-soft));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--color-text-secondary);
  max-width: 540px;
  margin: 0 auto 2.5rem;
  line-height: 1.5;
}

.hero-curve {
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.hero-curve svg {
  width: 100%;
  height: auto;
}

.hero-curve .curve-line {
  stroke-dasharray: 1600;
  stroke-dashoffset: 1600;
  transition: stroke-dashoffset 2s ease-out;
}

.hero-curve.animated .curve-line {
  stroke-dashoffset: 0;
}

.hero-curve .curve-fill {
  opacity: 0;
  transition: opacity 1.5s ease-out 0.5s;
}

.hero-curve.animated .curve-fill {
  opacity: 0.35;
}

/* Glow effect behind curve */
.hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, var(--color-hero-glow), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* --- Hero CTA --- */
.btn-hero {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.7rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-orange);
  border: 2px solid var(--color-orange);
  border-radius: 12px;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-hero:hover {
  background: var(--color-orange);
  color: #fff;
  transform: translateY(-1px);
}

.btn-hero:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
}

/* --- Feature Cards --- */
.features {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  transition: all var(--transition);
}

.feature-card:hover {
  background: var(--color-bg);
  border-color: var(--color-card-border-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-card-shadow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.5rem;
}

.feature-icon.orange {
  background: var(--color-icon-orange-bg);
  color: var(--color-orange);
}

.feature-icon.indigo {
  background: var(--color-icon-indigo-bg);
  color: var(--color-indigo-soft);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* --- Wissen Section --- */
.wissen-section { padding-top: 2rem; scroll-margin-top: 5rem; }
.wissen-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.wissen-card {
  display: block;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  text-decoration: none;
  transition: border-color var(--transition), transform var(--transition);
}
.wissen-card:hover {
  border-color: var(--color-card-border-hover);
  transform: translateY(-2px);
}
.wissen-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}
.wissen-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}
.wissen-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-orange);
  background: var(--color-icon-orange-bg);
  border-radius: 6px;
  padding: 0.15rem 0.5rem;
  margin-bottom: 0.5rem;
}
.wissen-tag-indigo { color: var(--color-indigo); background: var(--color-icon-indigo-bg); }
@media (max-width: 639px) { .wissen-grid { grid-template-columns: 1fr; } }

/* --- Philosophy --- */
.philosophy {
  position: relative;
  overflow: hidden;
}

.philosophy-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, var(--color-science-gradient) 50%, transparent 100%);
  pointer-events: none;
}

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

.philosophy-list {
  list-style: none;
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.philosophy-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.philosophy-marker {
  flex-shrink: 0;
  width: 4px;
  min-height: 100%;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--color-orange), var(--color-indigo));
}

.philosophy-list h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.philosophy-list p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* --- Privacy Badge --- */
.privacy {
  text-align: center;
  background: var(--color-bg-alt);
}

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-source-border);
  border-radius: var(--radius);
  padding: 1.5rem 2.5rem;
  margin-bottom: 1.5rem;
}

.privacy-shield {
  width: 48px;
  height: 48px;
  color: var(--color-indigo-soft);
}

.privacy-badge-text h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.privacy-badge-text p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.privacy-details {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.privacy-details span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.privacy-details .check {
  color: var(--color-indigo-soft);
  font-weight: 700;
}

/* --- Science Sources (in Wissen section) --- */
.science-sources {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 2rem;
  line-height: 1.6;
}

.science-sources a {
  color: var(--color-indigo-soft);
  text-decoration: none;
  transition: color var(--transition);
}

.science-sources a:hover {
  color: var(--color-indigo);
  text-decoration: underline;
}

/* --- Download --- */
.download {
  text-align: center;
  padding-bottom: 8rem;
}

.download h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.download p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}


/* --- Notify Form --- */
.notify-form {
  max-width: 440px;
  margin: 0 auto;
  text-align: left;
}

.notify-input-group {
  display: flex;
  gap: 0.5rem;
}

.notify-input-group input[type="email"] {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: var(--font-stack);
  border: 2px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition);
  min-width: 0;
}

.notify-input-group input[type="email"]:focus {
  outline: none;
  border-color: var(--color-orange);
}

.notify-input-group input[type="email"]::placeholder {
  color: var(--color-text-secondary);
  opacity: 0.6;
}

.btn-notify {
  display: inline-block;
  background: var(--color-orange);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  font-family: var(--font-stack);
  transition: background var(--transition), transform var(--transition);
}

.btn-notify:hover {
  background: var(--color-orange-soft);
  color: #fff;
  transform: translateY(-1px);
}

.btn-notify:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.notify-consent {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  cursor: pointer;
}

.notify-consent input[type="checkbox"] {
  margin-top: 0.25rem;
  accent-color: var(--color-orange);
}

.notify-consent a {
  color: var(--color-orange);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.notify-status {
  text-align: center;
  margin-top: 0.75rem;
  font-size: 0.9rem;
  min-height: 1.4em;
}

.notify-status.success {
  color: var(--color-indigo);
  font-weight: 500;
}

.notify-status.error {
  color: var(--color-error);
}

.notify-consent.highlight {
  animation: consent-nudge 0.4s ease;
}

@keyframes consent-nudge {
  0%, 100% { background: transparent; }
  30% { background: var(--color-consent-nudge); border-radius: 6px; }
}

@media (max-width: 480px) {
  .notify-input-group {
    flex-direction: column;
  }

  .btn-notify {
    width: 100%;
    text-align: center;
  }
}

/* --- Sticky Mobile Banner --- */
.sticky-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-sticky-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
  padding: 0.75rem var(--spacing);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transform: translateY(100%);
  transition: transform 0.4s ease;
}

.sticky-banner.visible {
  transform: translateY(0);
}

.sticky-banner-text {
  font-size: 0.9rem;
  font-weight: 600;
}

.sticky-banner-text span {
  color: var(--color-text-secondary);
  font-weight: 400;
  font-size: 0.8rem;
  display: block;
}

.sticky-banner .btn-cta {
  background: var(--color-orange);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  border-radius: 10px;
  border: none;
  white-space: nowrap;
  text-decoration: none;
  transition: background var(--transition);
}

.sticky-banner .btn-cta:hover {
  background: var(--color-orange-soft);
  color: #fff;
}

/* Hide sticky banner on desktop */
@media (min-width: 768px) {
  .sticky-banner {
    display: none;
  }
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

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

.footer-copy {
  color: var(--color-footer-copy);
}

/* --- Animations (Intersection Observer) --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger .fade-in:nth-child(1) { transition-delay: 0s; }
.stagger .fade-in:nth-child(2) { transition-delay: 0.1s; }
.stagger .fade-in:nth-child(3) { transition-delay: 0.2s; }
.stagger .fade-in:nth-child(4) { transition-delay: 0.3s; }

/* --- Enhanced Section Animations --- */

/* Features: cards scale up with wider stagger */
.features .feature-card.fade-in {
  transform: translateY(40px) scale(0.92);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.features .feature-card.fade-in.visible {
  transform: translateY(0) scale(1);
}

.features .stagger .fade-in:nth-child(1) { transition-delay: 0s; }
.features .stagger .fade-in:nth-child(2) { transition-delay: 0.15s; }
.features .stagger .fade-in:nth-child(3) { transition-delay: 0.3s; }

/* Features: icon pop on reveal */
.features .feature-card .feature-icon {
  opacity: 0;
  transform: scale(0.5);
}

.features .feature-card.fade-in.visible .feature-icon {
  animation: icon-pop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.4s both;
}

@keyframes icon-pop {
  0% { opacity: 0; transform: scale(0.5) rotate(-10deg); }
  60% { opacity: 1; transform: scale(1.15) rotate(2deg); }
  100% { opacity: 1; transform: scale(1) rotate(0deg); }
}

/* Philosophy: slide from left + marker grow */
.philosophy-list li.fade-in {
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.philosophy-list li.fade-in.visible {
  transform: translateX(0);
}

.philosophy-list li.fade-in:nth-child(1) { transition-delay: 0s; }
.philosophy-list li.fade-in:nth-child(2) { transition-delay: 0.15s; }
.philosophy-list li.fade-in:nth-child(3) { transition-delay: 0.3s; }
.philosophy-list li.fade-in:nth-child(4) { transition-delay: 0.45s; }

.philosophy-list li .philosophy-marker {
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.3s;
}

.philosophy-list li.fade-in.visible .philosophy-marker {
  transform: scaleY(1);
}

/* Privacy: shield pop + glow */
.privacy .fade-in .privacy-shield {
  opacity: 0;
  transform: scale(0.5);
  transition: opacity 0.6s ease 0.2s, transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s;
}

.privacy .fade-in.visible .privacy-shield {
  opacity: 1;
  transform: scale(1);
}

.privacy .fade-in.visible .privacy-badge {
  animation: shield-glow 2.5s ease-in-out 0.5s infinite alternate;
}

@keyframes shield-glow {
  from { box-shadow: 0 0 0 0 transparent; }
  to { box-shadow: 0 0 30px 8px var(--color-shield-glow); }
}

/* Privacy: staggered checkmarks */
.privacy-details span {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.privacy .fade-in.visible .privacy-details span {
  opacity: 1;
  transform: translateY(0);
}

.privacy .fade-in.visible .privacy-details span:nth-child(1) { transition-delay: 0.5s; }
.privacy .fade-in.visible .privacy-details span:nth-child(2) { transition-delay: 0.7s; }
.privacy .fade-in.visible .privacy-details span:nth-child(3) { transition-delay: 0.9s; }

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .hero-curve .curve-line {
    stroke-dashoffset: 0;
    transition: none;
  }

  .hero-curve .curve-fill {
    opacity: 0.35;
    transition: none;
  }

  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .features .feature-card .feature-icon {
    opacity: 1;
    transform: none;
  }

  .philosophy-list li .philosophy-marker {
    transform: none;
  }

  .privacy .fade-in .privacy-shield {
    opacity: 1;
    transform: none;
  }

  .privacy-details span {
    opacity: 1;
    transform: none;
  }
}

/* --- Legal Pages --- */
.legal {
  padding-top: 8rem;
  padding-bottom: 4rem;
}

.legal h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
}

.legal h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.legal h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.legal p,
.legal li {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.legal ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.legal a {
  color: var(--color-orange);
}

/* --- Support / FAQ --- */
.support-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

details {
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
}

details:first-of-type {
  border-top: 1px solid var(--color-border);
}

summary {
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text);
}

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

summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--color-text-secondary);
  transition: transform 0.2s;
  flex-shrink: 0;
  margin-left: 1rem;
}

details[open] summary::after {
  content: "\2212";
}

details p {
  margin-top: 0.75rem;
  margin-bottom: 0.25rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.contact-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.contact-box h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.contact-box p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.legal .contact-btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  background: var(--color-orange);
  color: #fff;
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
}

.legal .contact-btn:hover {
  background: var(--color-orange-soft);
  color: #fff;
  transform: translateY(-1px);
}

.lang-toggle-btn {
  font-size: 0.85rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-family: var(--font-stack);
  font-weight: 500;
  transition: all var(--transition);
}

.lang-toggle-btn:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.lang-toggle-btn.active {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
  pointer-events: none;
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111111;
    --color-bg-alt: #1A1A1A;
    --color-bg-card: #1E1E1E;
    --color-bg-card-hover: #2A2A2A;
    --color-text: #F0F0F0;
    --color-text-secondary: #9CA3AF;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-nav-bg: rgba(17, 17, 17, 0.85);
    --color-nav-bg-solid: rgba(17, 17, 17, 0.97);
    --color-nav-shadow: rgba(0, 0, 0, 0.3);
    --color-overlay: rgba(0, 0, 0, 0.5);
    --color-hero-glow: rgba(255, 122, 0, 0.1);
    --color-card-shadow: rgba(0, 0, 0, 0.2);
    --color-card-border-hover: rgba(255, 122, 0, 0.35);
    --color-icon-orange-bg: rgba(255, 122, 0, 0.15);
    --color-icon-indigo-bg: rgba(79, 70, 229, 0.15);
    --color-science-gradient: rgba(255, 122, 0, 0.05);
    --color-source-border: rgba(79, 70, 229, 0.25);
    --color-sticky-bg: rgba(17, 17, 17, 0.92);
    --color-footer-copy: rgba(255, 255, 255, 0.3);
    --color-error: #E74C3C;
    --color-consent-nudge: rgba(231, 76, 60, 0.12);
    --color-device-shadow: rgba(0, 0, 0, 0.5);
    --color-device-shadow-sm: rgba(0, 0, 0, 0.4);
    --color-svg-grid: rgba(255, 255, 255, 0.08);
    --color-svg-grid-light: rgba(255, 255, 255, 0.05);
    --color-shield-glow: rgba(99, 102, 241, 0.2);
  }

  .hero-curve line[stroke] {
    stroke: var(--color-svg-grid);
  }

  .hero-curve text[fill] {
    fill: var(--color-text-secondary);
  }
}

/* Extra bottom padding on mobile for sticky banner */
@media (max-width: 767px) {
  .download {
    padding-bottom: 10rem;
  }
}

/* --- Hero App Store CTA --- */
.hero-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  margin-top: 2rem;
}

.btn-appstore {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: #1A1A1A;
  color: #fff;
  padding: 0.75rem 1.75rem;
  border-radius: 14px;
  text-decoration: none;
  transition: background var(--transition);
}

.btn-appstore:hover {
  background: #333;
}

.btn-appstore-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.btn-appstore-sub {
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  opacity: 0.8;
  line-height: 1;
}

.btn-appstore-name {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.2;
}

.qr-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.qr-block img {
  width: 96px;
  height: 96px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: #fff;
}

.qr-block span {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

@media (min-width: 640px) {
  .hero-actions {
    flex-direction: row;
    justify-content: center;
  }
}

/* --- Scroll-Pinned Coverflow Carousel --- */
.slide-carousel-track {
  height: 500vh;
  position: relative;
}

.slide-carousel-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Fade edges into website background */
.slide-carousel-sticky::before,
.slide-carousel-sticky::after {
  content: "";
  position: absolute;
  top: 0;
  width: 12%;
  height: 100%;
  z-index: 8;
  pointer-events: none;
}

.slide-carousel-sticky::before {
  left: 0;
  background: linear-gradient(to right, var(--color-bg), transparent);
}

.slide-carousel-sticky::after {
  right: 0;
  background: linear-gradient(to left, var(--color-bg), transparent);
}

/* Top/bottom fade */
.slide-carousel-fade-y {
  position: absolute;
  left: 0;
  width: 100%;
  height: 15%;
  z-index: 8;
  pointer-events: none;
}

.slide-carousel-fade-y.top {
  top: 0;
  background: linear-gradient(to bottom, var(--color-bg), transparent);
}

.slide-carousel-fade-y.bottom {
  bottom: 0;
  background: linear-gradient(to top, var(--color-bg), transparent);
}

.slide-carousel-slide {
  position: absolute;
  top: 50%;
  left: 50%;
  transition: transform 0.6s ease, opacity 0.6s ease, filter 0.6s ease;
  pointer-events: none;
  will-change: transform, opacity;
}

.slide-carousel-slide img {
  display: block;
  max-height: 82vh;
  width: auto;
  border-radius: 16px;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.15);
}

/* Positions set by JS via data-offset: -2, -1, 0, 1, 2 */
.slide-carousel-slide[data-offset="0"] {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
  z-index: 5;
  pointer-events: auto;
}

.slide-carousel-slide[data-offset="1"] {
  transform: translate(10%, -50%) scale(0.75);
  opacity: 0.5;
  z-index: 4;
}

.slide-carousel-slide[data-offset="-1"] {
  transform: translate(-110%, -50%) scale(0.75);
  opacity: 0.5;
  z-index: 4;
}

.slide-carousel-slide[data-offset="2"] {
  transform: translate(60%, -50%) scale(0.6);
  opacity: 0.25;
  z-index: 3;
}

.slide-carousel-slide[data-offset="-2"] {
  transform: translate(-160%, -50%) scale(0.6);
  opacity: 0.25;
  z-index: 3;
}

.slide-carousel-slide[data-offset="hidden"] {
  transform: translate(-50%, -50%) scale(0.5);
  opacity: 0;
  z-index: 1;
}

.slide-carousel-dots {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.slide-carousel-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: var(--color-text-muted);
  opacity: 0.3;
  cursor: pointer;
  padding: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.slide-carousel-dots .dot.active {
  opacity: 1;
  background: #FF7A00;
  transform: scale(1.3);
}

@media (max-width: 640px) {
  .slide-carousel-track {
    height: 400vh;
  }

  .slide-carousel-slide img {
    max-height: 72vh;
    border-radius: 10px;
  }

  .slide-carousel-slide[data-offset="1"] {
    transform: translate(20%, -50%) scale(0.65);
  }

  .slide-carousel-slide[data-offset="-1"] {
    transform: translate(-120%, -50%) scale(0.65);
  }

  .slide-carousel-slide[data-offset="2"],
  .slide-carousel-slide[data-offset="-2"] {
    opacity: 0;
  }

  .slide-carousel-dots {
    bottom: 1rem;
    gap: 8px;
  }

  .slide-carousel-dots .dot {
    width: 8px;
    height: 8px;
  }
}

/* --- Desktop Enhancements --- */
@media (min-width: 1024px) {
  html {
    font-size: 106.25%; /* 17px base */
  }

  :root {
    --max-width: 1120px;
    --spacing: 2.5rem;
  }

  section {
    padding: 7rem 0;
  }

  .hero-tagline {
    max-width: 620px;
  }

  .section-header {
    margin-bottom: 3.5rem;
  }

  .section-header p {
    max-width: 640px;
  }

  .feature-grid {
    gap: 1.75rem;
  }

  .feature-card {
    padding: 2.5rem 2rem;
  }

  .philosophy-list {
    max-width: 780px;
  }

  .privacy-badge {
    padding: 2rem 3.5rem;
    gap: 1.5rem;
  }

  .privacy-details {
    gap: 3rem;
    margin-top: 1.5rem;
  }

  .science-sources {
    margin-top: 3rem;
  }

  .footer {
    padding: 3rem 0;
  }

  .footer-links {
    gap: 2rem;
  }
}

@media (min-width: 1440px) {
  html {
    font-size: 112.5%; /* 18px base */
  }

  :root {
    --max-width: 1280px;
    --spacing: 3rem;
  }

  section {
    padding: 8rem 0;
  }

  .hero {
    padding-top: 6rem;
  }

  .hero-tagline {
    max-width: 680px;
    margin-bottom: 3rem;
  }

  .hero-curve {
    max-width: 800px;
  }

  .section-header {
    margin-bottom: 4rem;
  }

  .feature-grid {
    gap: 2rem;
  }

  .feature-card {
    padding: 3rem 2.5rem;
  }

  .philosophy-list {
    max-width: 860px;
    gap: 2rem;
  }

  .privacy-badge {
    padding: 2.5rem 4rem;
  }

  .privacy-details {
    gap: 3.5rem;
    margin-top: 2rem;
  }

  .download {
    padding-bottom: 10rem;
  }

  .footer {
    padding: 3.5rem 0;
  }
}