/* ==========================================================================
   Dario Fumarola — shared stylesheet for project/paper pages
   Same design tokens as assets/css/style.css.
   ========================================================================== */

:root {
  --bg: #faf9f7;
  --surface: #ffffff;
  --surface-2: #f4f2ef;
  --border: #e5e2dd;
  --border-strong: #d6d2cb;
  --text: #1c1917;
  --text-2: #44403c;
  --muted: #6f6a63;
  --faint: #a29d95;
  --accent: #1d4ed8;
  --accent-hover: #1e40af;
  --accent-tint: rgba(29, 78, 216, 0.08);
  --ring: rgba(29, 78, 216, 0.35);
  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.05);
  --callout-bg: #fff8ec;
  --callout-border: #f0d9a8;

  --font-serif: "Crimson Pro", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

[data-theme="dark"] {
  --bg: #101014;
  --surface: #17171c;
  --surface-2: #1e1e24;
  --border: #2a2a32;
  --border-strong: #3a3a44;
  --text: #e8e6e3;
  --text-2: #c8c5c0;
  --muted: #9c98a0;
  --faint: #6b6873;
  --accent: #7aa2f7;
  --accent-hover: #9db9f9;
  --accent-tint: rgba(122, 162, 247, 0.12);
  --ring: rgba(122, 162, 247, 0.4);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --callout-bg: rgba(240, 180, 80, 0.1);
  --callout-border: rgba(240, 180, 80, 0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  max-width: 900px;
  padding: 0 28px 64px;
  background: var(--bg);
  color: var(--text-2);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* ---------- Top bar ---------- */

.paper-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
}
.paper-nav .home-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--muted);
}
.paper-nav .home-link:hover { color: var(--accent); text-decoration: none; }
.paper-nav .home-link svg { width: 15px; height: 15px; stroke: currentColor; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.25s ease;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--border-strong); }
.theme-toggle svg { width: 17px; height: 17px; stroke: currentColor; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ---------- Typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
}
h1 { font-size: 2rem; margin: 0.4em 0 0.5em; letter-spacing: -0.01em; }
h2 { font-size: 1.45rem; margin: 1.8em 0 0.6em; }
h3 { font-size: 1.15rem; margin: 1.6em 0 0.5em; }

p { margin: 0.9em 0; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--accent-hover); text-decoration: underline; text-underline-offset: 3px; }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
  border-radius: 4px;
}

strong, b { color: var(--text); font-weight: 600; }

ul, ol { margin: 0.5em 0 0.9em 1.2em; padding-left: 0.3em; }
li { margin: 0.3em 0; }

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

/* ---------- Paper elements ---------- */

.meta { margin-top: 0.7em; color: var(--muted); font-size: 0.95em; }

.abstract {
  margin: 1.6em 0;
  padding: 1.1em 1.3em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
}
.abstract h2 { margin-top: 0.2em; font-size: 1.2rem; }
.abstract p:last-child { margin-bottom: 0.2em; }

.badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 2px 10px;
  border-radius: 999px;
  margin: 0 6px 6px 0;
}

code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 0.1em 0.35em;
  border-radius: 5px;
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--text);
}

pre {
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 1em 1.2em;
  border-radius: 10px;
  overflow-x: auto;
  margin: 1em 0;
  line-height: 1.55;
}
pre code { background: none; border: none; padding: 0; }

.equation { margin: 1.1em 0; text-align: center; overflow-x: auto; }

figure { margin: 1.5em 0; padding: 0; }
figcaption {
  margin-top: 0.65em;
  font-size: 0.9em;
  font-style: italic;
  color: var(--muted);
}

.panel,
.theorem,
.algorithm,
.results,
.future {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin: 1.1em 0;
}
.theorem { font-style: italic; }
.theorem strong, .theorem b { font-style: normal; }
.algorithm { font-size: 0.95em; }

.callout {
  background: var(--callout-bg);
  border: 1px solid var(--callout-border);
  border-radius: 10px;
  padding: 12px 16px;
  margin: 1em 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  font-size: 0.95em;
}
th, td {
  border: 1px solid var(--border);
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--surface-2);
  color: var(--text);
  font-weight: 600;
}
tr:nth-child(even) td { background: var(--surface); }

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0.9em 0;
}

.svg-wrap {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  background: var(--surface);
  overflow-x: auto;
}

.img-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 1em 0;
}
.img-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  padding: 10px;
}
.img-card img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: block;
}
.img-title {
  margin: 0.6em 0 0.4em;
  font-weight: 600;
  color: var(--text);
  font-size: 13px;
}

@media (min-width: 900px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .img-grid { grid-template-columns: 1fr 1fr 1fr; }
}

.hr {
  height: 1px;
  background: var(--border);
  margin: 1.6em 0;
  border: 0;
}

.references { padding-left: 2em; text-indent: -2em; font-size: 0.95em; }
.references p { margin: 0.7em 0; }

.footnote, .small {
  color: var(--muted);
  font-size: 12px;
  margin-top: 1.4em;
}
.muted { color: var(--muted); }

.mermaid {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin: 1.2em 0;
  text-align: center;
  overflow-x: auto;
}

video { max-width: 100%; border-radius: 10px; border: 1px solid var(--border); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}