/* ============================================================
   style.css — inefficient.org
   
   Art Direction: Stone-age / primal / origin-of-innovation
   Tone: Authoritative, editorial, warm, primal earthiness
   Typography: ONCE-style — Cormorant Garamond as primary serif
   Palette: Warm earthy tones — burnt sienna accent, parchment surfaces
   ============================================================ */

/* --- Custom Properties: Light Mode --- */
:root {
  --color-bg: #F5F0E8;
  --color-surface: #FAF7F2;
  --color-surface-2: #FFFDF9;
  --color-text: #2A2118;
  --color-text-muted: #7A6E60;
  --color-text-faint: #B5A898;
  --color-primary: #6B3A2A;
  --color-primary-hover: #5A2E20;
  --color-divider: #DDD5C8;
  --color-border: #CCC3B4;

  --font-serif: 'Cormorant', Georgia, 'Times New Roman', serif;
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --content-width: min(100%, 34.5em);
  --section-padding: clamp(3rem, 8vw, 7rem);
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: light;
}

/* --- Dark Mode --- */
[data-theme="dark"] {
  --color-bg: #1A1714;
  --color-surface: #211E1A;
  --color-surface-2: #2A2520;
  --color-text: #E8E0D4;
  --color-text-muted: #9A8E7E;
  --color-text-faint: #5E554A;
  --color-primary: #C17A5A;
  --color-primary-hover: #D4896A;
  --color-divider: #33302B;
  --color-border: #3D3832;

  color-scheme: dark;
}

/* --- Page Shell — lock max-width to standard MacBook Pro screen --- */
.page-shell {
  max-width: 1440px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Body --- */
body {
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2.225vw, 2rem);
  line-height: 1.3;
  letter-spacing: -0.0015em;
  font-feature-settings: "liga", "dlig";
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              color 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Selection --- */
::selection {
  background-color: var(--color-primary);
  color: var(--color-surface-2);
}

/* --- Skip to content --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: var(--color-surface-2);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  border-radius: 0 0 4px 4px;
  z-index: 1000;
  transition: top var(--transition-interactive);
}

.skip-link:focus {
  top: 0;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem clamp(1.25rem, 4vw, 2.5rem);
  background-color: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.site-header--scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] .site-header--scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.25);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.site-logo svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--color-text-muted);
  transition: color var(--transition-interactive),
              background-color var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  background-color: var(--color-divider);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* --- Hero Section --- */
.hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 85vh;
  padding: var(--section-padding) clamp(1.25rem, 4vw, 2.5rem);
  background-color: var(--color-text);
  color: var(--color-bg);
  text-align: center;
}

[data-theme="dark"] .hero {
  background-color: #0F0D0B;
  color: var(--color-text);
}

.hero__question {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 14em;
  margin-bottom: 0.6em;
}

.hero__answer {
  font-family: var(--font-serif);
  font-size: clamp(3.5rem, 10vw, 9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: #A8603E;
}

[data-theme="dark"] .hero__answer {
  color: var(--color-primary);
}

/* --- Content Sections --- */
.content-section {
  padding: var(--section-padding) clamp(1.25rem, 4vw, 2.5rem);
}

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

.content-width {
  width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
}

/* --- Prose --- */
.prose p {
  margin-top: 1.3em;
}

.prose p:first-child {
  margin-top: 0;
}

/* --- Not-bad (italic aside) --- */
.aside-text {
  font-style: italic;
  color: var(--color-text-muted);
}

/* --- History Pattern --- */
.history-block {
  padding: var(--section-padding) clamp(1.25rem, 4vw, 2.5rem);
}

.history-item {
  width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.8vw, 2.25rem);
  line-height: 1.35;
  padding: 0.6em 0;
  color: var(--color-text);
}

.history-item + .history-item {
  border-top: 1px solid var(--color-divider);
}

/* --- Pivot Line --- */
.pivot {
  padding: clamp(3rem, 10vw, 8rem) clamp(1.25rem, 4vw, 2.5rem);
  text-align: center;
}

.pivot__line {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.5vw, 3rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
  max-width: 18em;
  margin-left: auto;
  margin-right: auto;
}

.pivot__line span {
  color: var(--color-primary);
}

/* --- Block Quote style for rhetorical questions --- */
.rhetorical-block {
  padding: var(--section-padding) clamp(1.25rem, 4vw, 2.5rem);
}

.rhetorical-item {
  width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2.225vw, 2rem);
  line-height: 1.35;
  padding: 1em 0 1em 1.5em;
  border-left: 3px solid var(--color-divider);
  color: var(--color-text);
}

.rhetorical-item + .rhetorical-item {
  margin-top: 1.5em;
}

/* --- Threat / parallel constructions --- */
.threat-block {
  padding: var(--section-padding) clamp(1.25rem, 4vw, 2.5rem);
}

.threat-lead {
  width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 1em;
}

.threat-item {
  width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2.4vw, 2rem);
  line-height: 1.35;
  color: var(--color-text-muted);
  padding: 0.4em 0;
}

/* --- Bargain Section --- */
.bargain-section {
  padding: var(--section-padding) clamp(1.25rem, 4vw, 2.5rem);
  background-color: var(--color-surface);
}

.bargain-quiet {
  width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2.225vw, 2rem);
  line-height: 1.35;
  font-style: italic;
  color: var(--color-text-muted);
}

.bargain-shift {
  width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-top: 1.5em;
  color: var(--color-primary);
}

/* --- Builder Manifesto --- */
.manifesto-block {
  padding: var(--section-padding) clamp(1.25rem, 4vw, 2.5rem);
}

.manifesto-line {
  width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2.4vw, 2rem);
  line-height: 1.35;
  padding: 0.5em 0;
}

.manifesto-line + .manifesto-line {
  border-top: 1px solid var(--color-divider);
}

/* --- CTA / Direct Address --- */
.cta-section {
  padding: var(--section-padding) clamp(1.25rem, 4vw, 2.5rem);
  background-color: var(--color-primary);
  color: #FAF7F2;
}

[data-theme="dark"] .cta-section {
  background-color: var(--color-primary);
  color: #1A1714;
}

.cta-section .content-width {
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2.225vw, 2rem);
  line-height: 1.35;
}

.cta-section p + p {
  margin-top: 1.3em;
}

.cta-lead {
  font-size: clamp(1.5rem, 2.8vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* --- Sign-off --- */
.signoff {
  padding: clamp(3rem, 8vw, 6rem) clamp(1.25rem, 4vw, 2.5rem);
  text-align: center;
}

.signoff__yours {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: 0.5em;
}

.signoff__team {
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2.225vw, 2rem);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25em;
}

.signoff__url {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--color-primary);
}

/* --- Footer --- */
.site-footer {
  padding: 2rem clamp(1.25rem, 4vw, 2.5rem);
  border-top: 1px solid var(--color-divider);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-text-faint);
}

.site-footer a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-interactive);
}

.site-footer a:hover {
  color: var(--color-primary);
}

/* --- Fade-in Animation (CSS Scroll-driven) --- */
.fade-in {
  opacity: 1; /* Fallback: visible by default */
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 80%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

/* Staggered fade-in for history items, manifesto lines */
.fade-in-stagger {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in-stagger:nth-child(1) { animation-delay: 0ms; }
  .fade-in-stagger:nth-child(2) { animation-delay: 60ms; }
  .fade-in-stagger:nth-child(3) { animation-delay: 120ms; }
  .fade-in-stagger:nth-child(4) { animation-delay: 180ms; }
  .fade-in-stagger:nth-child(5) { animation-delay: 240ms; }
}

/* --- Links in body --- */
.prose a,
.content-width a:not(.site-logo):not(.theme-toggle) {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition-interactive),
              text-decoration-color var(--transition-interactive);
}

.prose a:hover {
  color: var(--color-primary-hover);
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .hero {
    min-height: 70vh;
    padding-top: clamp(2rem, 6vw, 4rem);
    padding-bottom: clamp(2rem, 6vw, 4rem);
  }

  .hero__question {
    font-size: clamp(1.5rem, 6vw, 2.25rem);
  }

  .hero__answer {
    font-size: clamp(3rem, 14vw, 5rem);
  }

  .site-logo span {
    display: none;
  }

  .rhetorical-item {
    padding-left: 1em;
  }
}

/* --- Print --- */
@media print {
  .site-header,
  .theme-toggle,
  .skip-link {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
    background: #fff;
  }
}