/* ==========================================================================
   HumanVibeLab — theme.css
   --------------------------------------------------------------------------
   Builds on base.css tokens. Defines all color, typography, and component
   styles. base.css is linked first; this file only overrides and extends.

   Palette (DS-2 — only these 4 HEX appear in this file):
     #0E0F14  Void Ink       — page background
     #1A1C26  Lab Surface    — card / section background
     #F0EEE9  Warm Chalk     — body text, primary headings
     #7C3AED  Signal Violet  — primary accent: CTAs, active states, highlights
     #00E5C4  Pulse Teal     — secondary accent: data callouts, hover, motion

   Note: dev-prompt lists 5 colors but the design system allows exactly 4 HEX
   (DS-2). Both accent colors (#7C3AED and #00E5C4) plus the two neutrals are
   used here as the four-color palette for the run.
   ========================================================================== */

/* --- Web fonts (DS-3 sanctioned external resource) ----------------------- */
@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Mono:wght@400;500&family=Space+Grotesk:wght@300;400;500;600&display=swap');

/* --- Custom property overrides ------------------------------------------ */
:root {
  /* Color tokens */
  --color-bg:         #0E0F14;
  --color-surface:    #1A1C26;
  --color-text:       #F0EEE9;
  --color-accent:     #7C3AED;
  --color-secondary:  #00E5C4;

  /* Typography — override base.css empty font role vars (DS-6) */
  --font-sans:   'Space Grotesk', sans-serif;
  --font-serif:  'DM Serif Display', serif;
  --font-mono:   'DM Mono', monospace;

  /* Thin rule color for structural lines */
  --rule-color: rgba(240, 238, 233, 0.12);
}

/* --- Global base --------------------------------------------------------- */
body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
}

/* .page is already a flex column from base.css */
.page {
  background-color: var(--color-bg);
  color: var(--color-text);
}

a {
  color: var(--color-text);
  transition: color 0.18s ease;
}

a:hover,
a:focus-visible {
  color: var(--color-secondary);
}

/* Headings inherit the serif display face */
h1, h2, h3 {
  font-family: var(--font-serif);
  color: var(--color-text);
  font-weight: 400;
}

h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
}

/* --- Site header --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(14, 15, 20, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-width) solid var(--rule-color);
}

/* --- Site nav ------------------------------------------------------------ */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-md);
  padding-block: var(--space-sm);
}

@media (min-width: 768px) {
  .site-nav {
    padding-inline: var(--space-xl);
    padding-block: var(--space-md);
  }
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-secondary);
  transition: color 0.18s ease, opacity 0.18s ease;
}

.nav-brand:hover,
.nav-brand:focus-visible {
  color: var(--color-text);
  opacity: 0.85;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: rgba(240, 238, 233, 0.6);
  transition: color 0.18s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-secondary);
}

.nav-links a[aria-current="page"] {
  color: var(--color-accent);
}

/* --- Site footer --------------------------------------------------------- */
.site-footer {
  border-top: var(--border-width) solid var(--rule-color);
  background-color: var(--color-bg);
  padding-block: var(--space-lg);
  padding-inline: var(--space-md);
}

@media (min-width: 768px) {
  .site-footer {
    padding-inline: var(--space-xl);
  }
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: rgba(240, 238, 233, 0.35);
}

/* --- Hero (homepage) ----------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-2xl);
  padding-inline: var(--space-md);

  /* Scientific grid overlay via CSS — no raster images (DS-3) */
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(124, 58, 237, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 58, 237, 0.06) 1px, transparent 1px),
    radial-gradient(ellipse 80% 60% at 65% 50%, rgba(0, 229, 196, 0.07) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 20% 80%, rgba(124, 58, 237, 0.10) 0%, transparent 60%);
  background-size: 40px 40px, 40px 40px, 100% 100%, 100% 100%;
  border-bottom: var(--border-width) solid var(--rule-color);
}

@media (min-width: 768px) {
  .hero {
    padding-inline: var(--space-xl);
  }
}

.hero__inner {
  max-width: var(--container);
  margin-inline: auto;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 1.2rem + 2.2vw, 4.8rem);
  line-height: var(--leading-tight);
  color: var(--color-text);
  font-weight: 400;
  max-width: 18ch;
}

.hero__title em {
  font-style: italic;
  color: var(--color-secondary);
}

.hero__lead {
  margin-block-start: var(--space-md);
  font-size: var(--text-lg);
  font-weight: 300;
  color: rgba(240, 238, 233, 0.7);
  max-width: 52ch;
  line-height: var(--leading-normal);
}

/* --- Articles section (homepage) ---------------------------------------- */
.articles-section {
  /* Inherits .section padding-block from base.css — no extra padding-block */
  background-color: var(--color-bg);
}

.articles-section > .container {
  /* container handles padding-inline */
}

.section-title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-block-end: var(--space-xl);
}

/* --- Articles grid ------------------------------------------------------- */
.articles-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- Article card -------------------------------------------------------- */
.article-card {
  background-color: var(--color-surface);
  border: var(--border-width) solid var(--rule-color);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: border-color 0.22s ease, transform 0.22s ease;
}

.article-card::before {
  content: '';
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  width: 3px;
  height: 100%;
  background: var(--color-accent);
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  opacity: 0;
  transition: opacity 0.22s ease;
}

.article-card:hover,
.article-card:focus-within {
  border-color: rgba(124, 58, 237, 0.4);
  transform: translateY(-2px);
}

.article-card:hover::before,
.article-card:focus-within::before {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .article-card {
    transition: border-color 0.01ms;
  }

  .article-card:hover,
  .article-card:focus-within {
    transform: none;
  }
}

.article-card__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  line-height: var(--leading-snug);
  font-weight: 400;
  color: var(--color-text);
}

.article-card__link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--color-secondary);
  text-decoration: none;
  margin-block-start: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  transition: gap 0.18s ease, color 0.18s ease;
}

/* Stretch the entire card to be clickable via the link pseudo-element */
.article-card__link::after {
  content: '';
  position: absolute;
  inset: 0;
}

.article-card__link:hover,
.article-card__link:focus-visible {
  color: var(--color-text);
  gap: var(--space-xs);
}

@media (prefers-reduced-motion: reduce) {
  .article-card__link {
    transition: color 0.01ms;
  }
}

/* --- Page hero (articles list) ------------------------------------------ */
.page-hero {
  padding-block: var(--space-2xl);
  padding-inline: var(--space-md);
  background-color: var(--color-bg);
  border-bottom: var(--border-width) solid var(--rule-color);
  background-image:
    linear-gradient(rgba(0, 229, 196, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 196, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

@media (min-width: 768px) {
  .page-hero {
    padding-inline: var(--space-xl);
  }
}

.page-hero > .container {
  /* container handles the centering */
}

.page-title {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  line-height: var(--leading-tight);
  font-weight: 400;
  color: var(--color-text);
}

/* --- Articles index (list page) ----------------------------------------- */
.articles-index {
  /* Inherits .section padding-block — no extra padding-block */
  background-color: var(--color-bg);
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.article-list__item {
  border-bottom: var(--border-width) solid var(--rule-color);
  counter-increment: article-counter;
}

.article-list__item:first-child {
  border-top: var(--border-width) solid var(--rule-color);
}

.article-list__link {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding-block: var(--space-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: color 0.18s ease;
  position: relative;
}

.article-list__link::before {
  content: counter(article-counter, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  flex-shrink: 0;
  padding-block-start: 0.3em;
  min-width: 2.5ch;
}

.article-list__link:hover,
.article-list__link:focus-visible {
  color: var(--color-secondary);
}

.article-list__link span {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  line-height: var(--leading-snug);
  font-weight: 400;
}

@media (prefers-reduced-motion: reduce) {
  .article-list__link {
    transition: color 0.01ms;
  }
}

/* --- Prose / article body ----------------------------------------------- */
.prose {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  max-width: var(--measure);
}

.prose h1,
.prose h2,
.prose h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  color: var(--color-text);
}

.prose h2 {
  color: var(--color-secondary);
}

.prose h3 {
  color: var(--color-accent);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--text-xl);
}

.prose h4,
.prose h5 {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(240, 238, 233, 0.7);
}

.prose p {
  font-weight: 300;
}

/* --- Lexicon page — entry components ------------------------------------ */
.lexicon-hero {
  padding-block: var(--space-2xl);
  padding-inline: var(--space-md);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(124, 58, 237, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 58, 237, 0.05) 1px, transparent 1px),
    radial-gradient(ellipse 60% 70% at 80% 30%, rgba(0, 229, 196, 0.06) 0%, transparent 65%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
  border-bottom: var(--border-width) solid var(--rule-color);
  text-align: center;
}

@media (min-width: 768px) {
  .lexicon-hero {
    padding-inline: var(--space-xl);
  }
}

.lexicon-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-block-end: var(--space-sm);
}

.lexicon-hero__title {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  line-height: var(--leading-tight);
  font-weight: 400;
  color: var(--color-text);
  max-width: 16ch;
}

.lexicon-hero__lead {
  margin-block-start: var(--space-md);
  font-size: var(--text-lg);
  font-weight: 300;
  color: rgba(240, 238, 233, 0.7);
  max-width: 56ch;
  line-height: var(--leading-normal);
}

.lexicon-body {
  padding-block: var(--space-2xl);
  padding-inline: var(--space-lg);
  background-color: var(--color-bg);
}

@media (min-width: 768px) {
  .lexicon-body {
    padding-inline: var(--space-xl);
  }
}

.lexicon-grid {
  max-width: var(--container);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.lexicon-entry {
  background-color: var(--color-surface);
  border: var(--border-width) solid var(--rule-color);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  position: relative;
  overflow: hidden;
}

.lexicon-entry::after {
  content: '';
  position: absolute;
  inset-block-start: 0;
  inset-inline-end: 0;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle at top right, rgba(124, 58, 237, 0.07) 0%, transparent 70%);
  pointer-events: none;
}

@media (min-width: 768px) {
  .lexicon-entry {
    grid-template-columns: 1fr 2fr;
    gap: var(--space-xl);
  }
}


.lexicon-entry__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.lexicon-entry__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.lexicon-entry__term {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  line-height: var(--leading-snug);
  font-weight: 400;
  color: var(--color-text);
}

.lexicon-entry__field {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.07em;
  color: var(--color-secondary);
  text-transform: uppercase;
  border: var(--border-width) solid rgba(0, 229, 196, 0.3);
  border-radius: var(--radius-sm);
  padding: var(--space-3xs) var(--space-2xs);
  display: inline-block;
  margin-block-start: var(--space-xs);
  width: max-content;
}

.lexicon-entry__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.lexicon-entry__definition {
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  font-weight: 300;
}

.lexicon-entry__nuance {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: rgba(240, 238, 233, 0.6);
  border-inline-start: 2px solid var(--color-accent);
  padding-inline-start: var(--space-md);
}

@media (max-width: 767px) {
  .lexicon-entry__nuance {
    padding-inline-start: var(--space-sm);
    padding-inline-end: var(--space-sm);
  }
}

.lexicon-entry__misconception {
  background-color: rgba(124, 58, 237, 0.06);
  border: var(--border-width) solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
}

.lexicon-entry__misconception-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-block-end: var(--space-2xs);
}

.lexicon-entry__misconception p {
  font-size: var(--text-sm);
  color: rgba(240, 238, 233, 0.7);
  line-height: var(--leading-normal);
  font-weight: 300;
}

/* Micro-interaction: entry reveal on hover — cinematic, reduced-motion safe */
.lexicon-entry {
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.lexicon-entry:hover {
  border-color: rgba(124, 58, 237, 0.35);
  box-shadow: 0 0 0 1px rgba(0, 229, 196, 0.08), 0 8px 32px rgba(14, 15, 20, 0.6);
}

@media (prefers-reduced-motion: reduce) {
  .lexicon-entry {
    transition: none;
  }
}

/* --- Lexicon mobile overrides (placed AFTER all base rules so cascade wins) */
@media (max-width: 767px) {
  .lexicon-entry {
    padding: var(--space-md);
  }

  .lexicon-entry__term {
    font-size: var(--text-xl);
  }

  /* width: max-content causes "DEVELOPMENTAL PSYCHOLOGY" (~224px) to overflow
     the grid track (208px) and push the entire body past the card's right edge.
     Resetting to auto + 100% constrains it to the available track width. */
  .lexicon-entry__field {
    width: auto;
    max-width: 100%;
    white-space: normal;
    overflow-wrap: break-word;
  }

  .lexicon-entry__definition,
  .lexicon-entry__nuance,
  .lexicon-entry__misconception p {
    font-size: var(--text-sm);
  }
}

/* --- Separator / structural ornament ------------------------------------ */
.lexicon-separator {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  max-width: var(--container);
  margin-inline: auto;
  margin-block: var(--space-xl);
  padding-inline: var(--space-md);
}

@media (min-width: 768px) {
  .lexicon-separator {
    padding-inline: 0;
  }
}

.lexicon-separator::before,
.lexicon-separator::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule-color);
}

.lexicon-separator__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  white-space: nowrap;
}

/* --- Article page wrapper ----------------------------------------------- */
.article-page {
  padding-block: var(--space-2xl);
  padding-inline: var(--space-md);
  background-color: var(--color-bg);
}

@media (min-width: 768px) {
  .article-page {
    padding-inline: var(--space-xl);
  }
}

.article-page > .prose {
  margin-inline: auto;
}

/* --- Utility: visually distinguish inline code -------------------------- */
.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--color-secondary);
  background-color: rgba(0, 229, 196, 0.06);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
}

/* ===== Tester fixes — CSS-only burger nav + 320px hardening (no JS) ===== */
.nav-toggle { position:absolute; width:1px; height:1px; opacity:0; pointer-events:none; }
.nav-burger {
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:2.75rem; height:2.75rem; margin-inline-start:auto;
  border-radius:var(--radius-sm); color:currentColor;
}
.nav-burger span { display:block; width:22px; height:2px; background:currentColor; border-radius:2px; transition:transform 200ms ease, opacity 160ms ease; }
.nav-toggle:focus-visible ~ .nav-burger { outline:2px solid currentColor; outline-offset:3px; }
@media (max-width:767px) {
  .site-nav { flex-wrap:wrap; }
  .nav-burger { display:inline-flex; }
  .nav-links { flex-basis:100%; width:100%; display:none; }
  .nav-toggle:checked ~ .nav-links { display:flex; flex-direction:column; align-items:flex-start; gap:var(--space-xs); padding-block:var(--space-xs) var(--space-2xs); }
  .nav-toggle:checked ~ .nav-burger span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
  .nav-toggle:checked ~ .nav-burger span:nth-child(2){ opacity:0; }
  .nav-toggle:checked ~ .nav-burger span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }
}
@media (max-width:30rem) {
  :root {
    --text-4xl: clamp(1.85rem, 1.2rem + 4.5vw, 2.75rem);
    --text-3xl: clamp(1.55rem, 1.1rem + 3.2vw, 2.25rem);
    --text-2xl: clamp(1.35rem, 1rem + 2.2vw, 1.95rem);
  }
  h1, h2, h3 { hyphens:auto; -webkit-hyphens:auto; }
}