/* papilov.org — Editorial Design System v3
   Soft light/dark, system-default, toggle-able */

:root {
  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
  --measure: 38em;
}

/* ── LIGHT — warm paper, not bleach white ── */
:root, [data-theme="light"] {
  --bg: #faf9f7;
  --bg-secondary: #f3f2ef;
  --surface: #eceae6;
  --border: #ddd9d3;
  --border-light: #e8e5e0;
  --text: #2c2c2c;
  --text-secondary: #5c5c5c;
  --text-tertiary: #8c8c8c;
  --link: #2c2c2c;
  --link-underline: #c5c0b8;
  --link-hover: #111111;
  --code-bg: #f0eeea;
  --selection-bg: #d5d0c8;
  --tag-bg: #eeebe6;
  --tag-text: #5c5c5c;
  --status-draft: #b8860b;
  --status-finished: #2d6a30;
  --status-wip: #996b1f;
  --bar-muted: rgba(0,0,0,0.06);
  --bar-accent: #3c3c3c;
  --red-soft: #c0392b;
  --green-soft: #27864a;
  --blue-soft: #2c6fbb;
  --yellow-soft: #b8860b;
  --purple-soft: #6c5ce7;
}

/* ── DARK — warm charcoal, not pitch black ── */
[data-theme="dark"] {
  --bg: #1c1b1a;
  --bg-secondary: #222120;
  --surface: #2a2928;
  --border: #3a3836;
  --border-light: #302e2c;
  --text: #cec9c1;
  --text-secondary: #96918a;
  --text-tertiary: #6e6a64;
  --link: #cec9c1;
  --link-underline: #4a4744;
  --link-hover: #e8e4dc;
  --code-bg: #252423;
  --selection-bg: #3e3c3a;
  --tag-bg: #2e2d2b;
  --tag-text: #96918a;
  --status-draft: #d4a843;
  --status-finished: #5a9e5d;
  --status-wip: #c8922e;
  --bar-muted: rgba(255,255,255,0.06);
  --bar-accent: #b0a898;
  --red-soft: #e07063;
  --green-soft: #5a9e5d;
  --blue-soft: #6a9fd8;
  --yellow-soft: #d4a843;
  --purple-soft: #9b8ce8;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1c1b1a;
    --bg-secondary: #222120;
    --surface: #2a2928;
    --border: #3a3836;
    --border-light: #302e2c;
    --text: #cec9c1;
    --text-secondary: #96918a;
    --text-tertiary: #6e6a64;
    --link: #cec9c1;
    --link-underline: #4a4744;
    --link-hover: #e8e4dc;
    --code-bg: #252423;
    --selection-bg: #3e3c3a;
    --tag-bg: #2e2d2b;
    --tag-text: #96918a;
    --status-draft: #d4a843;
    --status-finished: #5a9e5d;
    --status-wip: #c8922e;
    --bar-muted: rgba(255,255,255,0.06);
    --bar-accent: #b0a898;
    --red-soft: #e07063;
    --green-soft: #5a9e5d;
    --blue-soft: #6a9fd8;
    --yellow-soft: #d4a843;
    --purple-soft: #9b8ce8;
  }
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
::selection { background: var(--selection-bg); }

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.container { max-width: 720px; margin: 0 auto; padding: 0 1.5rem; }

/* ── HEADER ── */
.site-header { padding: 2rem 0; border-bottom: 1px solid var(--border); }
.site-header .container { display: flex; justify-content: space-between; align-items: baseline; }

.site-logo,
.site-title {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text);
}
.site-logo:hover, .site-title:hover { color: var(--link-hover); }

.site-nav { display: flex; align-items: baseline; gap: 1.25rem; }
.site-nav a { font-size: 0.82rem; color: var(--text-secondary); text-decoration: none; letter-spacing: 0.02em; }
.site-nav a:hover { color: var(--text); }
.site-nav a.active { color: var(--text); font-weight: 500; }

.header-utils { display: flex; align-items: baseline; gap: 0.75rem; }

.theme-toggle {
  background: none; border: none; cursor: pointer;
  color: var(--text-tertiary); font-size: 0.9rem;
  padding: 0; line-height: 1; transition: color 0.15s;
}
.theme-toggle:hover { color: var(--text); }

/* Language switcher */
.lang-switch { display: flex; gap: 0.4rem; }
.lang-switch a {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.03em;
  color: var(--text-tertiary);
  text-decoration: none;
  padding: 0.15em 0.35em;
  border-radius: 2px;
  transition: color 0.15s;
}
.lang-switch a:hover { color: var(--text); }
.lang-switch a.active {
  color: var(--text);
  background: var(--tag-bg);
  font-weight: 500;
}

/* ── TYPOGRAPHY ── */
h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; }
h1 { font-size: 2.4rem; margin-bottom: 1rem; line-height: 1.15; }
h2 { font-size: 1.5rem; margin-top: 3rem; margin-bottom: 1rem; }
h3 { font-size: 1.15rem; margin-top: 2rem; margin-bottom: 0.75rem; }
p { margin-bottom: 1.2rem; }

a { color: var(--link); text-decoration-color: var(--link-underline); text-underline-offset: 3px; transition: text-decoration-color 0.15s, color 0.15s; }
a:hover { color: var(--link-hover); text-decoration-color: var(--link-hover); }
strong { font-weight: 600; }

blockquote { border-left: 2px solid var(--border); padding-left: 1.25rem; margin: 1.5rem 0; color: var(--text-secondary); font-style: italic; }
hr { border: none; border-top: 1px solid var(--border); margin: 3rem 0; }

code { font-family: var(--font-mono); font-size: 0.85em; background: var(--code-bg); padding: 0.15em 0.35em; border-radius: 3px; }
pre { background: var(--code-bg); padding: 1.25rem; border-radius: 4px; border: 1px solid var(--border-light); overflow-x: auto; margin: 1.5rem 0; font-size: 0.85rem; line-height: 1.6; }
pre code { background: none; padding: 0; }
ul, ol { margin: 1rem 0; padding-left: 1.5rem; }
li { margin-bottom: 0.4rem; }
img { max-width: 100%; height: auto; margin: 1.5rem 0; }

/* ── HOMEPAGE ── */
.home-hero, .home-intro { padding: 6rem 0 3rem; }
.home-hero h1, .home-intro h1 { font-size: 2rem; font-weight: 700; margin-bottom: 1.5rem; }
.home-hero h1 .accent { color: var(--text); -webkit-text-fill-color: var(--text); background: none; }
.home-hero .intro, .home-intro .lead { font-size: 1.05rem; color: var(--text-secondary); line-height: 1.8; max-width: var(--measure); margin-bottom: 2rem; }
.home-links { display: flex; gap: 1.5rem; font-size: 0.9rem; }
.home-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; padding: 0; border: none; }
.home-links a:first-child { color: var(--text); font-weight: 500; }
.home-links a:hover { color: var(--link-hover); }

/* ── RESEARCH LIST ── */
.research-list { padding: 3rem 0; }
.research-list h1 { font-size: 1.8rem; margin-bottom: 2rem; }
.research-list h2:not(.research-item h2) {
  font-family: var(--font-sans); font-size: 0.75rem; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-tertiary);
  margin-bottom: 1.5rem; margin-top: 0;
}

.research-item { padding: 1.5rem 0; border-top: 1px solid var(--border-light); }
.research-item:last-child { border-bottom: 1px solid var(--border-light); }
.research-item a { text-decoration: none; color: inherit; display: block; }
.research-item a:hover h2 { color: var(--link-hover); }

.research-meta {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-tertiary);
  letter-spacing: 0.02em; margin-bottom: 0.4rem; display: flex; gap: 1rem; align-items: center;
}
.research-meta .status {
  font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.05em;
  text-transform: uppercase; padding: 0.15em 0.5em; border-radius: 2px; background: none;
}
.research-meta .status-draft { color: var(--status-draft); border: 1px solid var(--status-draft); }
.research-meta .status-in-progress { color: var(--status-wip); border: 1px dashed var(--status-wip); }
.research-meta .status-finished { color: var(--status-finished); border: 1px solid var(--status-finished); }

.research-item h2 { font-family: var(--font-serif); font-size: 1.25rem; font-weight: 700; margin: 0 0 0.5rem; transition: color 0.15s; line-height: 1.3; }
.research-item .excerpt { font-size: 0.9rem; color: var(--text-secondary); margin: 0; line-height: 1.65; }
.research-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.6rem; }
.research-tags span { font-family: var(--font-mono); font-size: 0.65rem; color: var(--tag-text); background: var(--tag-bg); padding: 0.15em 0.5em; border-radius: 2px; }

/* ── ARTICLE ── */
.article-header { padding: 4rem 0 2rem; border-bottom: 1px solid var(--border); margin-bottom: 2rem; }
.article-header .label { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 1rem; }
.article-header h1 { font-size: 2.4rem; margin-bottom: 0.75rem; }
.article-header .description { font-size: 1.1rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 1.5rem; max-width: var(--measure); }
.article-header .meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-tertiary); display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }

.article-body { padding-bottom: 4rem; }
.article-body h2 { font-size: 1.4rem; margin-top: 2.5rem; margin-bottom: 0.75rem; }
.article-body h3 { font-size: 1.15rem; margin-top: 2rem; margin-bottom: 0.5rem; }
.article-body p { font-size: 1rem; line-height: 1.78; margin-bottom: 1.2rem; }
.article-body strong { font-weight: 600; }
.article-body blockquote { border-left: 2px solid var(--border); padding: 0 0 0 1.25rem; margin: 1.5rem 0; color: var(--text-secondary); font-style: italic; background: none; border-radius: 0; }
.article-body code { font-family: var(--font-mono); font-size: 0.85em; background: var(--code-bg); padding: 0.15em 0.35em; border-radius: 3px; }
.article-body pre { background: var(--code-bg); border: 1px solid var(--border-light); border-radius: 4px; padding: 1.25rem; overflow-x: auto; margin: 1.5rem 0; }
.article-body pre code { background: none; padding: 0; }
.article-body img { max-width: 100%; border-radius: 4px; margin: 1.5rem 0; }
.article-body ul, .article-body ol { margin: 1rem 0; padding-left: 1.5rem; font-size: 1rem; }
.article-body li { margin-bottom: 0.4rem; line-height: 1.75; }

.ai-disclosure { font-size: 0.82rem; color: var(--text-tertiary); font-style: italic; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--border-light); }
.ai-disclosure strong { color: var(--text-secondary); }

/* ── INLINE DATA VIZ (replaces iframe infographic) ── */

/* Metric row */
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1px; background: var(--border-light); border: 1px solid var(--border); border-radius: 6px; overflow: hidden; margin: 2rem 0; }
.metric { background: var(--bg-secondary); padding: 1.25rem; text-align: center; }
.metric .val { font-family: var(--font-mono); font-size: 1.4rem; font-weight: 500; margin-bottom: 0.25rem; }
.metric .val--red { color: var(--red-soft); }
.metric .val--green { color: var(--green-soft); }
.metric .val--blue { color: var(--blue-soft); }
.metric .val--yellow { color: var(--yellow-soft); }
.metric .desc { font-size: 0.72rem; color: var(--text-tertiary); }

/* Horizontal bar chart */
.bars { margin: 2rem 0; display: flex; flex-direction: column; gap: 0.6rem; }
.bar-row { display: grid; grid-template-columns: 120px 1fr 55px; align-items: center; gap: 0.75rem; }
.bar-row .label { font-size: 0.82rem; font-weight: 500; text-align: right; }
.bar-row .track { height: 1.75rem; background: var(--bar-muted); border-radius: 3px; overflow: hidden; }
.bar-row .fill { height: 100%; border-radius: 3px; background: var(--bar-accent); display: flex; align-items: center; padding-left: 0.5rem; font-family: var(--font-mono); font-size: 0.65rem; color: var(--bg); }
.bar-row .pct { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-secondary); text-align: right; }
.bar-row.muted { opacity: 0.5; }

/* Two-column compare */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin: 2rem 0; }
.compare-col { border: 1px solid var(--border); border-radius: 6px; padding: 1.5rem; }
.compare-col h4 { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 1rem; }
.compare-col.col-a h4 { color: var(--red-soft); }
.compare-col.col-b h4 { color: var(--green-soft); }
.compare-item { padding: 0.75rem 0; border-bottom: 1px solid var(--border-light); }
.compare-item:last-child { border-bottom: none; }
.compare-item strong { display: block; font-size: 0.9rem; margin-bottom: 0.15rem; }
.compare-item span { font-size: 0.78rem; color: var(--text-tertiary); }

/* Revenue bars (mini) */
.rev-bars { display: flex; flex-direction: column; gap: 0.35rem; margin: 1rem 0; }
.rev-bar { display: flex; align-items: center; gap: 0.5rem; }
.rev-bar .rlabel { width: 70px; font-size: 0.7rem; text-align: right; color: var(--text-tertiary); }
.rev-bar .rtrack { flex: 1; height: 1.1rem; background: var(--bar-muted); border-radius: 2px; overflow: hidden; }
.rev-bar .rfill { height: 100%; border-radius: 2px; display: flex; align-items: center; justify-content: flex-end; padding-right: 0.4rem; font-family: var(--font-mono); font-size: 0.6rem; color: var(--bg); }
.rev-bar .rfill--sub { background: var(--purple-soft); }
.rev-bar .rfill--exp { background: var(--green-soft); }
.rev-bar .rfill--mtx { background: var(--yellow-soft); }

/* Case study box */
.case-box { border: 1px solid var(--border); border-radius: 6px; padding: 1.5rem; margin: 2rem 0; background: var(--bg-secondary); }
.case-box h4 { font-family: var(--font-serif); font-size: 1.15rem; margin-bottom: 0.5rem; }
.case-box .case-meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-tertiary); margin-bottom: 1rem; }

/* Timeline */
.timeline { position: relative; margin: 2rem 0; padding-left: 1.5rem; }
.timeline::before { content: ''; position: absolute; left: 0.35rem; top: 0.4rem; bottom: 0.4rem; width: 1px; background: var(--border); }
.tl-item { position: relative; padding-bottom: 1.5rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot { position: absolute; left: -1.35rem; top: 0.35rem; width: 8px; height: 8px; border-radius: 50%; border: 1.5px solid var(--text-tertiary); background: var(--bg); }
.tl-dot--red { border-color: var(--red-soft); }
.tl-dot--green { border-color: var(--green-soft); }
.tl-year { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-tertiary); margin-bottom: 0.15rem; }
.tl-title { font-weight: 600; font-size: 0.9rem; margin-bottom: 0.15rem; }
.tl-desc { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

/* Psych cards */
.psych-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 2rem 0; }
.psych-card { border: 1px solid var(--border); border-radius: 6px; padding: 1.25rem; }
.psych-card h4 { font-size: 0.95rem; margin-bottom: 0.5rem; }
.psych-card p { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 0.5rem; line-height: 1.6; }
.psych-card .big { font-family: var(--font-mono); font-size: 1.3rem; color: var(--text); }

/* Framework cards */
.fw-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 2rem 0; }
.fw-card { border: 1px solid var(--border); border-radius: 6px; padding: 1.25rem; position: relative; overflow: hidden; }
.fw-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; }
.fw-card--red::before { background: var(--red-soft); }
.fw-card--green::before { background: var(--green-soft); }
.fw-card--purple::before { background: var(--purple-soft); }
.fw-card h4 { font-size: 1rem; margin-bottom: 0.25rem; }
.fw-card .fw-sub { font-size: 0.78rem; color: var(--text-tertiary); margin-bottom: 0.75rem; }
.fw-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.5rem; }
.fw-tags span { font-family: var(--font-mono); font-size: 0.6rem; padding: 0.1em 0.4em; border-radius: 2px; background: var(--tag-bg); color: var(--tag-text); }
.fw-list { list-style: none; font-size: 0.78rem; color: var(--text-secondary); padding: 0; margin: 0; }
.fw-list li { padding: 0.3rem 0; border-bottom: 1px solid var(--border-light); }
.fw-list li:last-child { border-bottom: none; }
.fw-list li::before { content: '→ '; color: var(--text-tertiary); }

/* ── PAGE ── */
.page-content { padding: 4rem 0; }
.page-content h1 { font-size: 1.8rem; margin-bottom: 2rem; }
.page-content h2 { font-size: 1.4rem; margin-top: 2.5rem; margin-bottom: 0.75rem; }
.page-content p { font-size: 1rem; line-height: 1.78; color: var(--text-secondary); margin-bottom: 1.2rem; }
.page-content a { color: var(--link); text-decoration-color: var(--link-underline); }
.page-content ul { margin: 1rem 0; padding-left: 1.5rem; font-size: 1rem; color: var(--text-secondary); }
.page-content li { margin-bottom: 0.4rem; line-height: 1.75; }

/* ── 404 ── */
.error-page { text-align: center; padding: 8rem 0; }
.error-page h1 { font-size: 4rem; margin-bottom: 1rem; }
.error-page p { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 2rem; }
.error-page a { font-family: var(--font-mono); font-size: 0.85rem; }

/* ── FOOTER ── */
.site-footer { padding: 2rem 0; border-top: 1px solid var(--border); margin-top: 4rem; font-size: 0.75rem; color: var(--text-tertiary); line-height: 1.8; }
.site-footer a { color: var(--text-tertiary); text-decoration-color: var(--border); }
.site-footer a:hover { color: var(--text); }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  html { font-size: 16px; }
  h1 { font-size: 1.8rem; }
  .site-header .container { flex-direction: column; gap: 0.75rem; }
  .site-nav { gap: 1rem; }
  .home-hero, .home-intro { padding: 4rem 0 2rem; }
  .home-links { flex-direction: column; gap: 0.75rem; }
  .article-header { padding: 3rem 0 1.5rem; }
  .article-header h1 { font-size: 1.8rem; }
  .compare { grid-template-columns: 1fr; }
  .psych-grid { grid-template-columns: 1fr; }
  .fw-grid { grid-template-columns: 1fr; }
  .bar-row { grid-template-columns: 80px 1fr 45px; }
  .bar-row .label { font-size: 0.72rem; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
}

@media print {
  body { background: white; color: black; font-size: 11pt; }
  .site-header, .site-footer, .theme-toggle, .lang-switch { display: none; }
  a { color: black; text-decoration: underline; }
}