/* ===== DESIGN TOKENS ===== */
:root {
  /* Brand */
  --brand-slate: #5A92AE;
  --brand-sage: #52A352;

  /* Surfaces */
  --canvas: #F5F4F1;
  --surface: #EFEEE8;
  --card: #FFFFFF;

  /* Accent / CTA */
  --accent: #C87830;
  --accent-light: #D4944C;
  --accent-hover: #B56A28;

  /* Text */
  --text: #1A1A1A;
  --text-secondary: #6B6860;
  --text-hint: #6B6860;

  /* Borders */
  --border: #DDDBD5;
  --border-light: #E8E6E0;

  /* Status */
  --danger: #C75C5C;

  /* Block colors (timeline demo) */
  --nap-bg: #B0BAC4;
  --nap-border: #8A98A6;
  --awake-bg: #A8C8A8;
  --awake-border: #88AB88;
  --bed-bg: #D8D5D0;
  --bed-border: #C8C5C0;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-base: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Radius */
  --radius-sm: 8px;
  --radius-card: 12px;
  --radius-btn: 16px;

  /* Font */
  --font: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  /* Layout */
  --max-width: 960px;
  --header-height: 64px;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote { margin: 0; padding: 0; }
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

/* ===== BASE ===== */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1 { font-size: 2rem; font-weight: 700; line-height: 1.2; letter-spacing: -0.4px; }
h2 { font-size: 1.5rem; font-weight: 700; line-height: 1.25; letter-spacing: -0.3px; }
h3 { font-size: 1.2rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 1rem; font-weight: 600; line-height: 1.4; }
p + p { margin-top: var(--space-base); }

@media (min-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.75rem; }
}

/* ===== LAYOUT ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-base);
}

.section {
  padding: var(--space-3xl) 0;
}

.section--surface {
  background-color: var(--surface);
}

/* ===== HEADER ===== */
/* NAV:START */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.4px;
  text-decoration: none;
}
.logo-nap { color: var(--brand-slate); }
.logo-math { color: var(--brand-sage); }

.nav-links {
  display: none;
  list-style: none;
  gap: var(--space-lg);
}
.nav-links a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.15s;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
}
.nav-toggle svg { width: 24px; height: 24px; }

.nav-mobile {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: var(--space-base);
  list-style: none;
}
.nav-mobile.is-open { display: block; }
.nav-mobile li { padding: var(--space-md) 0; }
.nav-mobile a {
  color: var(--text-secondary);
  font-size: 16px;
  font-weight: 500;
}
.nav-mobile a:hover { color: var(--text); }

@media (min-width: 768px) {
  .nav-links { display: flex; }
  .nav-toggle { display: none; }
  .nav-mobile { display: none !important; }
}
/* NAV:END */

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-2xl) 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: center;
  text-align: center;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-base) var(--space-lg);
  justify-content: center;
}
.footer-links a { color: var(--text-secondary); }
.footer-links a:hover { color: var(--text); }

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ===== CARD ===== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
}

.card--surface {
  background: var(--surface);
  border-color: var(--border-light);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font);
  font-weight: 600;
  font-size: 16px;
  border-radius: var(--radius-btn);
  padding: 14px 28px;
  border: none;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.1s;
  text-decoration: none;
}
.btn:active { transform: scale(0.98); }

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

.btn--secondary {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn--secondary:hover {
  background: var(--accent);
  color: #FFFFFF;
}

/* ===== HERO ===== */
.hero {
  text-align: center;
  padding: var(--space-4xl) 0 var(--space-3xl);
}
.hero-logo {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.6px;
  margin-bottom: var(--space-base);
}
.hero-tagline {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-sm);
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto var(--space-xl);
}
.hero-note {
  margin-top: var(--space-md);
  font-size: 14px;
  color: var(--text-hint);
}

@media (min-width: 768px) {
  .hero-logo { font-size: 56px; }
  .hero-tagline { font-size: 2rem; }
}

/* ===== FEATURE GRID ===== */
.feature-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}
.feature-grid .card { text-align: center; }
.feature-grid h3 { margin-bottom: var(--space-sm); }
.feature-grid p { color: var(--text-secondary); font-size: 15px; }
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-base);
  font-size: 22px;
}

@media (min-width: 480px) {
  .feature-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .feature-grid { grid-template-columns: 1fr 1fr 1fr; }
}

/* ===== TIMELINE DEMO ===== */
.timeline-demo {
  max-width: 360px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: var(--space-lg) 0;
}
.timeline-block {
  border-radius: var(--radius-sm);
  padding: var(--space-md) var(--space-base);
  font-size: 13px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.timeline-block--awake {
  background: var(--awake-bg);
  border-left: 3.5px solid var(--awake-border);
  color: #0A1A0A;
}
.timeline-block--nap {
  background: var(--card);
  border-left: 3.5px solid var(--nap-border);
  color: #0A1420;
}
.timeline-block--bed {
  background: var(--bed-bg);
  border-left: 3.5px solid var(--bed-border);
  color: #6B6860;
}
.timeline-block span:last-child {
  font-weight: 400;
  font-size: 12px;
  opacity: 0.7;
}

/* ===== STEPS ===== */
.steps {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
  counter-reset: step;
}
.step {
  counter-increment: step;
  text-align: center;
}
.step::before {
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 18px;
  margin: 0 auto var(--space-md);
}
.step h3 { margin-bottom: var(--space-xs); }
.step p { color: var(--text-secondary); font-size: 15px; }

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

/* ===== FEATURE SECTIONS (How It Works) ===== */
.feature-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border-light);
}
.feature-section:last-child { border-bottom: none; }
.feature-section__text h2 { margin-bottom: var(--space-md); }
.feature-section__text p { color: var(--text-secondary); }
.feature-section__text p + p { margin-top: var(--space-md); }
.feature-section__visual {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-hint);
  font-size: 14px;
  text-align: center;
}

@media (min-width: 768px) {
  .feature-section {
    flex-direction: row;
    align-items: center;
  }
  .feature-section__text,
  .feature-section__visual {
    flex: 1;
  }
  .feature-section--reverse {
    flex-direction: row-reverse;
  }
}

/* ===== FAQ ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.faq-item summary {
  padding: var(--space-base) var(--space-lg);
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-base);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.faq-item[open] summary::after { content: '\2212'; }
.faq-item .faq-body {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

/* ===== BLOG ===== */
.blog-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}
.blog-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
}
.blog-card__date {
  font-size: 13px;
  color: var(--text-hint);
  margin-bottom: var(--space-sm);
}
.blog-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}
.blog-card__title a { color: var(--text); }
.blog-card__title a:hover { color: var(--accent); }
.blog-card__excerpt {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: var(--space-base);
}
.blog-card__link {
  font-weight: 600;
  font-size: 15px;
}

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

/* ===== BLOG POST ===== */
.breadcrumb {
  font-size: 14px;
  color: var(--text-hint);
  margin-bottom: var(--space-xl);
}
.breadcrumb a { color: var(--text-hint); }
.breadcrumb a:hover { color: var(--accent); }

.post-header {
  margin-bottom: var(--space-xl);
}
.post-header h1 { margin-bottom: var(--space-sm); }
.post-meta {
  font-size: 14px;
  color: var(--text-hint);
}

.post-body h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}
.post-body h3 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}
.post-body p { margin-bottom: var(--space-base); }
.post-body ul, .post-body ol {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-base);
  color: var(--text-secondary);
}
.post-body li { margin-bottom: var(--space-sm); }
.post-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-base);
  margin: var(--space-lg) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.post-back {
  display: inline-block;
  margin-top: var(--space-xl);
  font-weight: 600;
}

/* ===== LEGAL ===== */
.legal h1 { margin-bottom: var(--space-sm); }
.legal .legal-updated {
  font-size: 14px;
  color: var(--text-hint);
  margin-bottom: var(--space-xl);
}
.legal h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}
.legal p { margin-bottom: var(--space-base); color: var(--text-secondary); }
.legal ul {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-base);
  color: var(--text-secondary);
}
.legal li { margin-bottom: var(--space-sm); }
.legal .placeholder {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  font-size: 14px;
  color: var(--accent);
}

/* ===== SUPPORT ===== */
.support-contact {
  text-align: center;
  padding: var(--space-xl);
}
.support-contact__email {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  word-break: break-all;
}
.support-sections {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .support-sections { grid-template-columns: 1fr 1fr; }
}

/* ===== PAGE HEADER ===== */
.page-header {
  text-align: center;
  padding: var(--space-2xl) 0;
}
.page-header p {
  color: var(--text-secondary);
  margin-top: var(--space-sm);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== CTA BANNER ===== */
.cta-banner {
  text-align: center;
  padding: var(--space-3xl) 0;
}
.cta-banner h2 { margin-bottom: var(--space-md); }
.cta-banner p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

/* ===== UTILITIES ===== */
.text-center { text-align: center; }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }