:root {
  --bg: #14120F;
  --card: #292421;
  --card-hover: #302A25;
  --accent: #D9A633;
  --cyan: #F2CC59;
  --text: #FFFFFF;
  --text-secondary: rgba(255,255,255,0.75);
  --text-tertiary: rgba(255,255,255,0.50);
  --border: rgba(255,255,255,0.08);
  --gradient: linear-gradient(135deg, var(--accent), var(--cyan));
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--cyan); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }

.container { max-width: 800px; margin: 0 auto; padding: 0 24px; }

/* Nav */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(20,18,15,0.85);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
nav .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; }
.nav-brand img { width: 28px; height: 28px; border-radius: 6px; }
.nav-links { display: flex; align-items: center; gap: 20px; font-size: 13px; }
.nav-links a { color: var(--text-secondary); }
.nav-links a:hover { color: var(--text); }

/* Language switcher */
.nav-lang {
  position: relative;
}
.nav-lang-btn {
  background: none; border: 1px solid var(--border); color: var(--text-secondary);
  padding: 3px 10px; border-radius: 6px; font-size: 12px;
  cursor: pointer; font-family: inherit;
  transition: border-color 0.3s, color 0.3s;
}
.nav-lang-btn:hover { border-color: rgba(217,166,51,0.3); color: var(--text); }
.nav-lang-menu {
  display: none;
  position: absolute; right: 0; top: calc(100% + 8px);
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 6px 0;
  min-width: 120px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  z-index: 200;
}
.nav-lang.open .nav-lang-menu { display: block; }
.nav-lang-menu a {
  display: block; padding: 8px 16px; font-size: 13px;
  color: var(--text-secondary); white-space: nowrap;
}
.nav-lang-menu a:hover { background: var(--card-hover); color: var(--text); opacity: 1; }
.nav-lang-current { color: var(--accent) !important; font-weight: 600; }

/* Hamburger menu */
.nav-toggle { display: none; }
.nav-hamburger {
  display: none;
  width: 28px; height: 28px;
  cursor: pointer;
  flex-direction: column; justify-content: center; align-items: center; gap: 5px;
}
.nav-hamburger span {
  display: block; width: 20px; height: 2px;
  background: var(--text-secondary);
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle:checked ~ .nav-hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle:checked ~ .nav-hamburger span:nth-child(2) { opacity: 0; }
.nav-toggle:checked ~ .nav-hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 0 60px;
  background: radial-gradient(ellipse at 50% 0%, rgba(217,166,51,0.12) 0%, transparent 60%);
}
.hero-ring {
  position: relative;
  width: 180px; height: 180px;
  margin: 0 auto 24px;
  animation: ring-glow 5s ease-in-out infinite;
  filter: drop-shadow(0 0 14px rgba(230,181,77,0.5)) drop-shadow(0 0 36px rgba(217,166,51,0.2));
}
.hero-ring::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid transparent;
  background:
    conic-gradient(
      from -90deg,
      #C28F24 0%,
      #E6B54D 12%,
      #F5CC66 22%,
      #F5D68F 30%,
      #E6B54D 42%,
      #C28F24 56%,
      #E6B54D 71%,
      #F5CC66 84%,
      #F5D68F 92%,
      #C28F24 100%
    ) border-box;
  -webkit-mask: linear-gradient(#000 0 0) padding-box, linear-gradient(#000 0 0) border-box;
  mask: linear-gradient(#000 0 0) padding-box, linear-gradient(#000 0 0) border-box;
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: ring-rotate 20s linear infinite;
}
.hero-ring::before {
  content: "";
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 12px solid transparent;
  background:
    conic-gradient(
      from -90deg,
      rgba(194,143,36,0.1) 0%,
      rgba(245,204,102,0.35) 22%,
      rgba(245,214,143,0.4) 30%,
      rgba(194,143,36,0.08) 50%,
      rgba(245,204,102,0.3) 75%,
      rgba(245,214,143,0.35) 90%,
      rgba(194,143,36,0.1) 100%
    ) border-box;
  -webkit-mask: linear-gradient(#000 0 0) padding-box, linear-gradient(#000 0 0) border-box;
  mask: linear-gradient(#000 0 0) padding-box, linear-gradient(#000 0 0) border-box;
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  filter: blur(6px);
  animation: ring-rotate-reverse 15s linear infinite;
}
.hero-ring-pulse {
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  border: 1px solid rgba(245,204,102,0.12);
  animation: ring-pulse 5s ease-in-out infinite;
}
@keyframes ring-glow {
  0%, 100% { filter: drop-shadow(0 0 14px rgba(230,181,77,0.5)) drop-shadow(0 0 36px rgba(217,166,51,0.2)); }
  50% { filter: drop-shadow(0 0 22px rgba(245,214,143,0.6)) drop-shadow(0 0 50px rgba(230,181,77,0.3)); }
}
@keyframes ring-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes ring-rotate-reverse {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}
@keyframes ring-pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.15); opacity: 0; }
}
.hero-badge {
  display: inline-block;
  background: var(--gradient);
  color: var(--bg);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero h1 {
  font-size: 32px; font-weight: 800; margin-bottom: 16px;
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-lead {
  color: var(--text-secondary); font-size: 17px; margin-bottom: 32px;
  max-width: 480px; margin-left: auto; margin-right: auto;
  line-height: 1.8;
}
.hero-sub {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-tertiary);
}
.app-store-btn {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--text); color: var(--bg);
  padding: 14px 32px; border-radius: 14px;
  font-weight: 700; font-size: 15px;
  white-space: nowrap;
  transition: transform 0.2s, box-shadow 0.2s;
}
.app-store-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(217,166,51,0.35); opacity: 1; }
.app-store-btn svg { width: 22px; height: 22px; }

/* Section common */
.section-desc {
  text-align: center;
  color: var(--text-secondary);
  font-size: 15px;
  max-width: 520px;
  margin: -8px auto 36px;
  line-height: 1.7;
}

/* Features */
.features { padding: 80px 0 60px; }
.features h2 { text-align: center; font-size: 24px; margin-bottom: 16px; }
.feature-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 20px;
  text-align: center;
  transition: border-color 0.3s, background 0.3s;
}
.feature-card:hover { border-color: rgba(217,166,51,0.3); background: var(--card-hover); }
.feature-icon {
  font-size: 32px; margin-bottom: 12px;
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.feature-card h3 { font-size: 15px; margin-bottom: 8px; }
.feature-card p { color: var(--text-tertiary); font-size: 13px; line-height: 1.6; }

/* HRV Section */
.hrv-section {
  padding: 80px 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(217,166,51,0.06) 0%, transparent 70%);
  text-align: center;
}
.hrv-badge {
  display: inline-block;
  background: rgba(217,166,51,0.15);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hrv-section h2 {
  font-size: 26px; margin-bottom: 16px; line-height: 1.4;
}
.hrv-metrics {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
  margin-top: 40px;
}
.hrv-metric {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 20px;
  text-align: left;
  transition: border-color 0.3s, background 0.3s;
}
.hrv-metric:hover { border-color: rgba(217,166,51,0.3); background: var(--card-hover); }
.hrv-metric-icon {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(217,166,51,0.1);
  border-radius: 10px;
  margin-bottom: 14px;
}
.hrv-metric-icon svg {
  width: 22px; height: 22px;
  stroke: var(--accent);
}
.hrv-metric h3 { font-size: 15px; margin-bottom: 6px; }
.hrv-metric p { color: var(--text-tertiary); font-size: 13px; line-height: 1.6; }

.sensor-note {
  margin-top: 32px;
  padding: 16px 24px;
  background: rgba(242,204,89,0.06);
  border: 1px solid rgba(242,204,89,0.15);
  border-radius: 12px;
  display: inline-block;
}
.sensor-note p {
  color: var(--text-secondary);
  font-size: 13px;
}

/* Science Section */
.science-section {
  padding: 80px 0;
  text-align: center;
}
.science-section h2 { font-size: 24px; margin-bottom: 16px; }
.science-cards {
  display: flex; flex-direction: column; gap: 16px;
  margin-top: 40px;
}
.science-card {
  display: flex; align-items: center; gap: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  text-align: left;
  transition: border-color 0.3s;
}
.science-card:hover { border-color: rgba(217,166,51,0.3); }
.science-number {
  font-size: 20px; font-weight: 800;
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
  min-width: 140px;
  flex-shrink: 0;
  text-align: center;
}
.science-body h3 { font-size: 15px; margin-bottom: 4px; }
.science-body p { color: var(--text-tertiary); font-size: 13px; line-height: 1.6; }

/* HealthKit Section */
.healthkit-section {
  padding: 80px 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(242,204,89,0.05) 0%, transparent 70%);
}
.healthkit-grid {
  display: grid; grid-template-columns: 1fr auto; gap: 40px;
  align-items: center;
}
.healthkit-content h2 { font-size: 24px; margin-bottom: 12px; }
.healthkit-content p { color: var(--text-secondary); font-size: 15px; margin-bottom: 20px; line-height: 1.7; }
.healthkit-list {
  list-style: none; padding: 0;
}
.healthkit-list li {
  color: var(--text-secondary);
  font-size: 14px;
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}
.healthkit-list li::before {
  content: "";
  position: absolute; left: 0; top: 12px;
  width: 8px; height: 8px;
  background: var(--gradient);
  border-radius: 50%;
}
.healthkit-visual {
  display: flex; align-items: center; justify-content: center;
}
.healthkit-icon svg {
  width: 120px; height: 120px;
  opacity: 0.4;
  filter: drop-shadow(0 0 20px rgba(217,166,51,0.2));
}

/* Philosophy */
.philosophy {
  padding: 80px 0;
  text-align: center;
}
.philosophy h2 { font-size: 24px; margin-bottom: 16px; }
.philosophy > .container > p { color: var(--text-secondary); max-width: 560px; margin: 0 auto; font-size: 15px; }
.philosophy-points {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 10px;
  margin-top: 28px;
}
.philosophy-tag {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: border-color 0.3s;
}
.philosophy-tag:hover { border-color: rgba(217,166,51,0.3); }

/* CTA */
.cta {
  text-align: center;
  padding: 80px 0;
  background: radial-gradient(ellipse at 50% 80%, rgba(217,166,51,0.08) 0%, transparent 60%);
}
.cta h2 { font-size: 26px; margin-bottom: 12px; }
.cta-desc { color: var(--text-secondary); font-size: 15px; margin-bottom: 28px; }
.cta-sub { margin-top: 16px; font-size: 12px; color: var(--text-tertiary); }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 12px;
}
footer .footer-links { margin-bottom: 12px; display: flex; flex-direction: column; align-items: center; gap: 8px; }
footer .footer-links a { color: var(--text-tertiary); font-size: 12px; }

/* Pages */
.breadcrumb {
  padding: 16px 0 0;
  font-size: 13px;
  color: var(--text-tertiary);
}
.breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.breadcrumb li:not(:last-child)::after {
  content: "›";
  margin-left: 6px;
  color: var(--text-tertiary);
  opacity: 0.6;
}
.breadcrumb a { color: var(--text-secondary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb [aria-current="page"] { color: var(--text-secondary); }

.article-byline {
  margin-top: 48px;
  padding: 20px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
}
.article-byline p + p { margin-top: 8px; }
.article-byline .disclaimer {
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-tertiary);
}

.page-header {
  padding: 48px 0 32px;
  text-align: center;
  background: radial-gradient(ellipse at 50% 0%, rgba(217,166,51,0.08) 0%, transparent 60%);
}
.page-header h1 { font-size: 24px; }
.page-content { padding: 40px 0 80px; }
.page-content h2 { font-size: 18px; margin: 32px 0 12px; color: var(--text); }
.page-content p, .page-content li { color: var(--text-secondary); font-size: 14px; line-height: 1.8; }
.page-content ul { padding-left: 20px; }
.page-content ul li { margin-bottom: 6px; }

/* FAQ accordion */
details {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; margin-bottom: 12px;
}
details summary {
  padding: 16px 20px; cursor: pointer; font-weight: 600; font-size: 15px;
  list-style: none; display: flex; justify-content: space-between; align-items: center;
}
details summary::after { content: "+"; color: var(--accent); font-size: 20px; }
details[open] summary::after { content: "\2212"; }
details .faq-answer { padding: 0 20px 16px; color: var(--text-secondary); font-size: 14px; line-height: 1.7; }

/* Support */
.contact-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px; text-align: center;
}
.contact-card a {
  display: inline-block; margin-top: 16px;
  background: var(--gradient); color: var(--bg);
  padding: 10px 24px; border-radius: 10px; font-weight: 700;
}

/* Meditators */
.meditator-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  margin-bottom: 20px;
  transition: border-color 0.3s;
}
.meditator-card:hover { border-color: rgba(217,166,51,0.25); }
.meditator-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}
.meditator-emoji { font-size: 32px; flex-shrink: 0; }
.meditator-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--border);
}
.meditator-header h2 { font-size: 18px; margin: 0; }
.meditator-title { color: var(--text-tertiary); font-size: 13px; margin-top: 2px; }
.meditator-body p { margin-bottom: 12px; }
.meditator-body p:last-child { margin-bottom: 0; }
.meditator-body blockquote {
  margin: 16px 0 0;
  padding: 14px 20px;
  border-left: 3px solid var(--accent);
  background: rgba(217,166,51,0.04);
  border-radius: 0 10px 10px 0;
  color: var(--text-secondary);
  font-size: 14px;
  font-style: italic;
  line-height: 1.8;
}
.meditator-cta {
  text-align: center;
  padding: 48px 0 0;
  margin-top: 20px;
}
.meditator-cta h2 { font-size: 22px; margin-bottom: 10px; }
.meditator-cta p { color: var(--text-secondary); font-size: 15px; margin-bottom: 24px; }

/* Responsive */
@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hrv-metrics { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
  .hrv-section h2 { font-size: 22px; }
  .science-card { flex-direction: column; gap: 12px; text-align: center; }
  .science-number { min-width: auto; }
  .healthkit-grid { grid-template-columns: 1fr; text-align: center; }
  .healthkit-visual { display: none; }
  .healthkit-list li { text-align: left; }

  .app-store-btn { padding: 12px 20px; font-size: 14px; }
  .app-store-btn svg { width: 18px; height: 18px; }

  .nav-hamburger { display: flex; }
  .nav-links {
    display: none;
    position: absolute; top: 56px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: rgba(20,18,15,0.95);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
  }
  .nav-links a {
    display: block; padding: 12px 24px; font-size: 14px;
    border-bottom: 1px solid var(--border);
  }
  .nav-links a:last-child { border-bottom: none; }
  .nav-toggle:checked ~ .nav-links { display: flex; }
  .nav-lang { width: 100%; }
  .nav-lang-btn { display: block; width: 100%; text-align: left; padding: 12px 24px; border: none; border-bottom: 1px solid var(--border); border-radius: 0; font-size: 14px; }
  .nav-lang-menu {
    position: static; box-shadow: none; border: none; border-radius: 0;
    background: rgba(30,26,22,0.95); padding: 0;
  }
  .nav-lang.open .nav-lang-menu { display: block; }
  .nav-lang-menu a { padding: 10px 24px 10px 40px; border-bottom: 1px solid var(--border); }
}