/* ============================================================
   Kites: A Contemporary Guide — styles.css
   Stack: Plain HTML + CSS + vanilla JS (no build step)
   ============================================================ */

/* ---------- Custom properties ---------- */
:root {
  --color-bg: #f8f6f2;
  --color-surface: #ffffff;
  --color-surface-alt: #f0ede7;
  --color-text: #1a1a1a;
  --color-text-muted: #5a5a5a;
  --color-accent: #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-border: #e2ddd6;

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;

  --max-width: 1100px;
  --transition: 0.25s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.15em;
  transition: color var(--transition);
}
a:hover { color: var(--color-accent-dark); }
a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  top: -9999px;
  left: var(--space-4);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 9999;
  text-decoration: none;
}
.skip-link:focus { top: var(--space-4); }

/* ---------- Screen-reader only ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 246, 242, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

.site-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  flex-shrink: 0;
}

/* Nav toggle (mobile) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}
.nav-toggle:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger { position: relative; }
.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}
.hamburger::before { top: -6px; }
.hamburger::after  { top: 6px; }

.nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after  { transform: translateY(-6px) rotate(-45deg); }

/* Nav list */
.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  list-style: none;
  align-items: center;
}
.nav-list a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
  white-space: nowrap;
}
.nav-list a:hover { color: var(--color-accent); }
.nav-list a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- Fade-in sections ---------- */
.fade-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-section.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Hero ---------- */
.hero {
  background: var(--color-surface);
  padding-block: var(--space-16) var(--space-12);
}
.hero-inner {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}
.hero-text { max-width: 600px; }

h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.hero-lead {
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 52ch;
}

.hero-figure figcaption {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

.hero-img {
  border-radius: var(--radius-lg);
  width: 100%;
  object-fit: cover;
  max-height: 460px;
}

/* ---------- Intro ---------- */
.intro {
  background: var(--color-bg);
  padding-block: var(--space-16);
}
.intro-inner { max-width: 72ch; }
.intro-inner p + p { margin-top: var(--space-4); }

/* ---------- Section title ---------- */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-8);
}

/* ---------- Comparison table ---------- */
.comparison {
  background: var(--color-surface);
  padding-block: var(--space-16);
}
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
th, td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}
th {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  background: var(--color-surface-alt);
}
tr:hover td { background: var(--color-surface-alt); }
.table-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: var(--space-4);
}
.table-note sup a { font-size: 0.7rem; }

/* ---------- Kite sections ---------- */
.kite-section {
  background: var(--color-surface);
  padding-block: var(--space-16);
}
.kite-section--alt { background: var(--color-surface-alt); }

.kite-inner {
  display: grid;
  gap: var(--space-10, 2.5rem);
  align-items: start;
}

.kite-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.kite-subtitle {
  font-weight: 300;
  font-style: italic;
  font-size: 0.85em;
}

.kite-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  margin-bottom: var(--space-6);
  font-size: 0.875rem;
}
.kite-meta div { display: flex; gap: var(--space-2); align-items: baseline; }
.kite-meta dt {
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}
.kite-meta dd { color: var(--color-text); }

.kite-text p { color: var(--color-text); }
.kite-text p + p { margin-top: var(--space-4); }

/* Superscript citations */
sup a {
  font-size: 0.7em;
  text-decoration: none;
  color: var(--color-accent);
  font-weight: 600;
  vertical-align: super;
  line-height: 0;
  transition: color var(--transition);
}
sup a:hover { color: var(--color-accent-dark); text-decoration: underline; }

.kite-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}
.kite-figure img {
  width: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  transition: transform 0.4s ease;
}
.kite-figure:hover img { transform: scale(1.02); }
.kite-figure figcaption {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

/* ---------- Sources ---------- */
.sources { background: var(--color-bg); padding-block: var(--space-16); }
.sources-list {
  list-style: decimal inside;
  display: grid;
  gap: var(--space-2);
  font-size: 0.9rem;
}
.sources-list li { padding-left: var(--space-2); }
.sources-list a { word-break: break-word; }

/* ---------- Image credits ---------- */
.image-credits { background: var(--color-surface); padding-block: var(--space-16); }
.credits-list {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  font-size: 0.875rem;
}
.credits-list li { padding-left: var(--space-4); border-left: 3px solid var(--color-border); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.75);
  padding-block: var(--space-8);
  font-size: 0.875rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-8);
  justify-content: space-between;
  align-items: center;
}
.site-footer a { color: rgba(255, 255, 255, 0.9); }
.site-footer a:hover { color: #fff; }
.site-footer a:focus-visible {
  outline-color: rgba(255, 255, 255, 0.7);
}

/* ============================================================
   Responsive — mobile-first breakpoints
   ============================================================ */

/* Mobile: single column, collapsible nav */
@media (max-width: 767px) {
  .nav-toggle { display: block; }

  .nav-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-6);
    gap: var(--space-3);
    display: none;
  }
  .nav-list.open { display: flex; }

  .nav-list a { font-size: 1rem; }

  .hero { padding-block: var(--space-12) var(--space-8); }

  .kite-inner { grid-template-columns: 1fr; }
}

/* Tablet and up: two-column layout for kite sections */
@media (min-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
  }

  .kite-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }

  /* Alternate image/text order for visual rhythm */
  .kite-section:nth-child(odd) .kite-figure { order: -1; }

  .sources-list { columns: 2; gap: var(--space-2) var(--space-8); display: block; }
  .sources-list li { break-inside: avoid; margin-bottom: var(--space-2); }
}

/* Large: tighten max-width feel */
@media (min-width: 1100px) {
  .kite-inner { gap: var(--space-16); }
}

/* ============================================================
   Reduced-motion: disable all transitions and animations
   ============================================================ */
@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;
  }

  .fade-section {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .kite-figure img { transition: none !important; }
  .kite-figure:hover img { transform: none !important; }
}