/* ============================================================
   GIMP 3.2 MASTERY — Global Stylesheet
   style.css
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Design Tokens --- */
:root {
  --color-bg:           #0D0D14;
  --color-surface:      #1A1729;
  --color-surface-2:    #221F35;
  --color-border:       #2E2B45;
  --color-violet:       #7C3AED;
  --color-violet-light: #9D5FF5;
  --color-violet-dim:   rgba(124, 58, 237, 0.15);
  --color-amber:        #F59E0B;
  --color-amber-dim:    rgba(245, 158, 11, 0.12);
  --color-text:         #F0EDE6;
  --color-text-muted:   #8E8AA8;
  --color-text-faint:   #4E4A65;

  --font-display: 'Syne', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.5rem;
  --text-5xl:  3.5rem;
  --text-6xl:  5rem;

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --max-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h1 { font-size: var(--text-5xl); font-weight: 800; }
h2 { font-size: var(--text-3xl); font-weight: 700; }
h3 { font-size: var(--text-xl);  font-weight: 600; }
h4 { font-size: var(--text-lg);  font-weight: 600; }

p { color: var(--color-text-muted); max-width: 65ch; }

a {
  color: var(--color-violet-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-text); }
a:focus-visible {
  outline: 2px solid var(--color-violet);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

code, .mono { font-family: var(--font-mono); font-size: 0.9em; }

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

.section { padding-block: var(--space-20); }
.section--lg { padding-block: var(--space-24); }

/* --- Eyebrow --- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-violet-light);
  display: block;
  margin-bottom: var(--space-3);
}

/* --- Divider --- */
.divider { border: none; border-top: 1px solid var(--color-border); }

/* --- Tag/Badge --- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  background: var(--color-violet-dim);
  color: var(--color-violet-light);
  border: 1px solid rgba(124, 58, 237, 0.3);
  white-space: nowrap;
}

.tag--amber {
  background: var(--color-amber-dim);
  color: var(--color-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-violet);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-violet-light);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-violet);
}

/* --- Site Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 20, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}

.site-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  letter-spacing: -0.03em;
}

.site-logo__mark {
  width: 32px;
  height: 32px;
  background: var(--color-violet);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: var(--text-sm);
  font-weight: 800;
  color: #fff;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.site-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.site-nav a:hover { color: var(--color-text); }
.site-nav a.active { color: var(--color-violet-light); }

/* --- Progress Bar (global reading) --- */
.progress-bar-global {
  height: 2px;
  background: var(--color-border);
  position: relative;
  overflow: hidden;
}
.progress-bar-global__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-violet), var(--color-amber));
  width: 0%;
  transition: width var(--transition-slow);
}

/* --- Resource Box --- */
.resource-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-amber);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.resource-box__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-amber);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.resource-box__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.resource-box__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.resource-box__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-amber);
  background: var(--color-amber-dim);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  flex-shrink: 0;
  margin-top: 3px;
}

.resource-box__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: none;
}
.resource-box__text strong {
  color: var(--color-text);
  display: block;
  margin-bottom: 2px;
  font-weight: 600;
}
.resource-box__text a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-amber);
}
.resource-box__text a:hover { color: var(--color-text); }

/* --- Site Footer --- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12);
  margin-top: var(--space-24);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.site-footer__copy {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  max-width: none;
}

.site-footer__links {
  display: flex;
  gap: var(--space-5);
}
.site-footer__links a {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}
.site-footer__links a:hover { color: var(--color-text-muted); }

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --text-5xl: 2.25rem;
    --text-4xl: 1.875rem;
    --text-3xl: 1.5rem;
  }
  .container { padding-inline: var(--space-4); }
  .site-nav { display: none; }
  .site-footer__inner { flex-direction: column; align-items: flex-start; gap: var(--space-4); }
}