/* ============================================
   How to Tell If Someone - Style Sheet
   Minimal academic design
   ============================================ */

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

:root {
  --color-bg: #faf8f5;
  --color-bg-alt: #f3f0eb;
  --color-text: #2d2a26;
  --color-text-light: #5a5650;
  --color-text-muted: #8a8580;
  --color-accent: #c8923e;
  --color-accent-light: #e8c88a;
  --color-accent-dark: #a0742e;
  --color-border: #e0dcd6;
  --color-border-light: #ece8e2;
  --color-white: #ffffff;
  --color-card-bg: #ffffff;
  --font-heading: 'Crimson Pro', Georgia, serif;
  --font-body: 'Work Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 820px;
  --max-width-wide: 1100px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.72;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-light);
  text-underline-offset: 3px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

a:hover {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

/* --- Typography --- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

h1 {
  font-size: 2.6rem;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 1.85rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--color-border-light);
}

h3 {
  font-size: 1.35rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-xs);
  color: var(--color-accent-dark);
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-xs);
}

p {
  margin-bottom: var(--spacing-sm);
}

strong {
  font-weight: 600;
}

blockquote {
  border-left: 3px solid var(--color-accent);
  margin: var(--spacing-md) 0;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-alt);
  font-style: italic;
  color: var(--color-text-light);
  border-radius: 0 4px 4px 0;
}

blockquote p:last-child {
  margin-bottom: 0;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-lg) 0;
}

/* --- Header --- */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-logo:hover {
  color: var(--color-accent-dark);
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

.nav-list a {
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-text-light);
  padding: var(--spacing-xs) 0;
  position: relative;
  transition: color 0.2s ease;
}

.nav-list a:hover {
  color: var(--color-accent-dark);
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.25s ease;
}

.nav-list a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease;
}

/* --- Hero Section --- */
.hero {
  padding: var(--spacing-xl) 0;
  text-align: center;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-light);
  font-weight: 300;
  line-height: 1.65;
  max-width: 640px;
  margin: 0 auto var(--spacing-md);
}

.hero-divider {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  border: none;
  margin: var(--spacing-lg) auto;
}

/* --- Article Layout --- */
.article {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-xl);
}

.article-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border-light);
}

.article-header h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

.article-meta {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

.article-intro {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border-light);
}

/* --- Cards Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-md);
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--spacing-md) var(--spacing-xl);
}

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--spacing-md);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  border-color: var(--color-accent-light);
  box-shadow: 0 4px 16px rgba(0,0,0,0.05);
}

.card-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-dark);
  margin-bottom: var(--spacing-xs);
}

.card h3 {
  font-size: 1.25rem;
  margin-top: 0;
  margin-bottom: var(--spacing-xs);
}

.card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.card h3 a:hover {
  color: var(--color-accent-dark);
}

.card p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.card-link {
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-accent-dark);
}

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

/* --- Sign List --- */
.sign-list {
  counter-reset: sign-counter;
  list-style: none;
  padding: 0;
}

.sign-list > li {
  counter-increment: sign-counter;
  position: relative;
  padding: var(--spacing-md) 0 var(--spacing-md) 3.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.sign-list > li:last-child {
  border-bottom: none;
}

.sign-list > li::before {
  content: counter(sign-counter);
  position: absolute;
  left: 0;
  top: var(--spacing-md);
  width: 2.2rem;
  height: 2.2rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-accent-dark);
}

.sign-list h3 {
  margin-top: 0;
  font-size: 1.2rem;
}

/* --- Callout Box --- */
.callout {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 4px;
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.callout-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-accent-dark);
}

.callout p {
  font-size: 0.92rem;
  color: var(--color-text-light);
}

.callout p:last-child {
  margin-bottom: 0;
}

/* --- Key Points / Summary --- */
.key-points {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0 var(--spacing-lg);
}

.key-points h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.key-points ul {
  list-style: none;
  padding: 0;
}

.key-points li {
  padding: var(--spacing-xs) 0;
  padding-left: 1.5rem;
  position: relative;
  font-size: 0.92rem;
  color: var(--color-text-light);
  border-bottom: 1px solid var(--color-border-light);
}

.key-points li:last-child {
  border-bottom: none;
}

.key-points li::before {
  content: '\2014';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 600;
}

/* --- Section Intro --- */
.section-intro {
  font-size: 1.05rem;
  color: var(--color-text-light);
  max-width: var(--max-width);
  margin: 0 auto var(--spacing-lg);
  padding: 0 var(--spacing-md);
  text-align: center;
}

/* --- Table of Contents --- */
.toc {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.toc h4 {
  font-family: var(--font-heading);
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  font-size: 1rem;
  color: var(--color-text);
}

.toc ol {
  padding-left: 1.5rem;
  margin: 0;
}

.toc li {
  padding: 3px 0;
  font-size: 0.9rem;
}

.toc a {
  color: var(--color-text-light);
  text-decoration: none;
}

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

/* --- Related Articles --- */
.related {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 2px solid var(--color-border-light);
}

.related h2 {
  font-size: 1.5rem;
  border-bottom: none;
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-sm);
}

.related-card {
  padding: var(--spacing-sm);
  background: var(--color-bg-alt);
  border-radius: 4px;
  border: 1px solid var(--color-border-light);
}

.related-card h4 {
  margin-top: 0;
  margin-bottom: var(--spacing-xs);
}

.related-card h4 a {
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 1.05rem;
}

.related-card h4 a:hover {
  color: var(--color-accent-dark);
}

.related-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* --- Inline list --- */
.inline-list {
  list-style: none;
  padding: 0;
}

.inline-list li {
  padding: var(--spacing-xs) 0;
  padding-left: 1.5rem;
  position: relative;
  border-bottom: 1px solid var(--color-border-light);
}

.inline-list li:last-child {
  border-bottom: none;
}

.inline-list li::before {
  content: '\25B8';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-text);
  color: var(--color-bg-alt);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-white);
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-nav h4,
.footer-info h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
}

.footer-nav ul {
  list-style: none;
}

.footer-nav li {
  margin-bottom: var(--spacing-xs);
}

.footer-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.88rem;
}

.footer-nav a:hover {
  color: var(--color-accent-light);
}

.footer-info p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--spacing-md);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  h1 {
    font-size: 2rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  }

  .nav-list.nav-open {
    display: flex;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .sign-list > li {
    padding-left: 3rem;
  }

  .article-header h1 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .article-header h1 {
    font-size: 1.7rem;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }
}