/* Field Notes — design-system tokens and component classes for Maria Fonseca's
   software engineering / data science portfolio. Plain CSS on plain HTML:
   no JS framework, no build step. See readme.md for rationale. */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* — base neutrals (cool, near-desaturated) — */
  --color-bg: oklch(98.3% 0.003 255);
  --color-surface: oklch(96% 0.005 256);
  --color-inset: oklch(94% 0.006 258);
  --color-text: oklch(19% 0.014 262);
  --color-text-secondary: oklch(46% 0.014 260);
  --color-text-tertiary: oklch(64% 0.012 260);
  --color-divider: oklch(87% 0.008 258);
  --color-divider-strong: oklch(72% 0.01 258);

  /* — single accent: sophisticated indigo, one hue only — */
  --color-accent: oklch(53% 0.11 265);
  --color-accent-hover: oklch(46% 0.115 265);
  --color-accent-press: oklch(40% 0.12 265);
  --color-accent-soft: oklch(94% 0.03 265);
  --color-accent-soft-border: oklch(85% 0.05 265);
  --color-on-accent: oklch(99% 0.002 255);

  --color-inverse-bg: var(--color-text);
  --color-inverse-text: oklch(98% 0.003 255);

  /* — type — */
  --font-sans: 'Sora', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --text-2xs: 0.6875rem;  /* 11px — eyebrow labels */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.8125rem;   /* 13px */
  --text-base: 1.0625rem; /* 17px — body */
  --text-md: 1.25rem;     /* 20px */
  --text-lg: 1.5rem;      /* 24px */
  --text-xl: 2rem;        /* 32px */
  --text-2xl: 2.5rem;     /* 40px */
  --text-3xl: 3.25rem;    /* 52px */
  --text-4xl: 4.75rem;    /* 76px — hero */

  --leading-tight: 1.05;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;

  --tracking-tight: -0.02em;
  --tracking-label: 0.12em;

  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* — spacing — */
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 20px; --space-6: 24px; --space-8: 32px; --space-10: 40px;
  --space-12: 48px; --space-16: 64px; --space-20: 80px; --space-24: 96px;
  --space-32: 128px; --space-40: 160px;

  --radius-sm: 3px; --radius-md: 6px; --radius-lg: 12px; --radius-pill: 999px;

  --shadow-sm: 0 1px 2px oklch(20% 0.01 260 / 0.06);
  --shadow-md: 0 8px 24px oklch(20% 0.01 260 / 0.08);
  --shadow-lg: 0 20px 48px oklch(20% 0.01 260 / 0.12);

  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 420ms;

  --container-max: 1160px;
  --container-padding: clamp(24px, 6vw, 96px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--color-bg); color: var(--color-text);
  font-family: var(--font-sans); font-size: var(--text-base);
  line-height: var(--leading-relaxed); font-weight: var(--weight-regular);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5 { margin: 0; font-family: var(--font-sans); font-weight: var(--weight-semibold); letter-spacing: var(--tracking-tight); line-height: var(--leading-tight); }
p { margin: 0; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-hover); text-decoration: underline; text-underline-offset: 3px; }
img, svg { display: block; max-width: 100%; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: var(--color-accent-soft); color: var(--color-text); }

.container { max-width: var(--container-max); margin: 0 auto; padding-left: var(--container-padding); padding-right: var(--container-padding); }
.section-label {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono); font-size: var(--text-2xs);
  letter-spacing: var(--tracking-label); text-transform: uppercase;
  color: var(--color-text-tertiary);
}
.section-label::before { content: ''; width: 14px; height: 1px; background: var(--color-accent); display: inline-block; }

/* — buttons — */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  cursor: pointer; text-decoration: none; white-space: nowrap;
  font-family: var(--font-sans); font-weight: var(--weight-medium); font-size: var(--text-sm);
  padding: 14px 26px; border-radius: var(--radius-sm); border: 1px solid transparent;
  transition: background var(--duration-fast) var(--ease-standard), color var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard), opacity var(--duration-fast) var(--ease-standard);
}
.btn:hover { text-decoration: none; }
.btn svg, .btn img { width: 15px; height: 15px; }
.btn-primary { background: var(--color-text); color: var(--color-inverse-text); border-color: var(--color-text); }
.btn-primary:hover { background: oklch(30% 0.014 262); color: var(--color-inverse-text); }
.btn-accent { background: var(--color-accent); color: var(--color-on-accent); border-color: var(--color-accent); }
.btn-accent:hover { background: var(--color-accent-hover); color: var(--color-on-accent); }
.btn-secondary { background: transparent; color: var(--color-text); border-color: var(--color-divider-strong); }
.btn-secondary:hover { background: var(--color-inset); color: var(--color-text); }
.btn-ghost { background: transparent; color: var(--color-text-secondary); padding-inline: 4px; }
.btn-ghost:hover { color: var(--color-text); }
.btn-sm { padding: 9px 16px; font-size: var(--text-xs); }

/* — tags (mono, technical) — */
.tag {
  display: inline-flex; align-items: center; font-family: var(--font-mono);
  font-size: var(--text-xs); line-height: 1; padding: 6px 10px; border-radius: var(--radius-sm);
  background: var(--color-inset); color: var(--color-text-secondary); border: 1px solid transparent;
}
.tag-accent { background: var(--color-accent-soft); color: var(--color-accent); border-color: var(--color-accent-soft-border); }
.tag-outline { background: transparent; color: var(--color-text); border-color: var(--color-divider-strong); }

/* — navigation — */
.nav {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between;
  padding: 20px var(--container-padding); border-bottom: 1px solid var(--color-divider);
  background: color-mix(in oklch, var(--color-bg) 85%, transparent); backdrop-filter: blur(10px);
}
.nav-brand { font-weight: var(--weight-semibold); font-size: var(--text-sm); color: var(--color-text); }
.nav-links { display: flex; align-items: center; gap: var(--space-8); }
.nav-links a { font-size: var(--text-sm); font-weight: var(--weight-medium); color: var(--color-text-secondary); }
.nav-links a:hover, .nav-links a[aria-current='page'] { color: var(--color-text); text-decoration: none; }
.social-link { display: inline-flex; align-items: center; gap: 8px; font-size: var(--text-sm); font-weight: var(--weight-medium); color: var(--color-text); }
.social-link:hover { color: var(--color-accent); text-decoration: none; }
.social-link svg { width: 14px; height: 14px; }

/* — cards — */
.card {
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
  background: var(--color-bg); padding: var(--space-8);
  transition: box-shadow var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out), border-color var(--duration-base) var(--ease-out);
  display: flex; flex-direction: column; gap: var(--space-4);
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--color-divider-strong); }
.card-title { font-size: var(--text-md); }
.card-body { color: var(--color-text-secondary); font-size: var(--text-sm); line-height: var(--leading-relaxed); }
.card-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.card-links { display: flex; gap: var(--space-6); margin-top: var(--space-1); }
.card-links a { font-size: var(--text-sm); font-weight: var(--weight-medium); }
.card-links a.muted { color: var(--color-text-secondary); }
.card-featured { padding: var(--space-12); gap: var(--space-6); }
.card-featured .card-title { font-size: var(--text-xl); }

/* — stats — */
.stat { display: flex; flex-direction: column; gap: 6px; padding-top: var(--space-4); border-top: 1px solid var(--color-divider); }
.stat-value { font-family: var(--font-mono); font-size: var(--text-lg); color: var(--color-accent); font-weight: var(--weight-medium); }
.stat-label { font-family: var(--font-sans); font-size: var(--text-2xs); text-transform: uppercase; letter-spacing: var(--tracking-label); color: var(--color-text-secondary); }

/* — pipeline (horizontal process) — */
.pipeline { display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-1); }
.pipeline-step { display: flex; flex-direction: column; align-items: center; gap: 8px; min-width: 108px; }
.pipeline-index { font-family: var(--font-mono); font-size: var(--text-2xs); color: var(--color-text-tertiary); }
.pipeline-label {
  border: 1px solid var(--color-divider-strong); border-radius: var(--radius-sm); padding: 10px 14px;
  font-size: var(--text-xs); font-weight: var(--weight-medium); text-align: center; background: var(--color-bg);
}
.pipeline-arrow { color: var(--color-text-tertiary); font-family: var(--font-mono); padding: 0 4px; }

/* — journey (vertical timeline) — */
.journey-step { display: flex; gap: var(--space-4); }
.journey-rail { display: flex; flex-direction: column; align-items: center; }
.journey-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--color-divider-strong); flex-shrink: 0; }
.journey-dot-current { background: var(--color-accent); box-shadow: 0 0 0 4px var(--color-accent-soft); }
.journey-line { width: 1px; flex: 1; background: var(--color-divider); margin: 6px 0; }
.journey-label { font-size: var(--text-base); color: var(--color-text-secondary); padding-bottom: var(--space-8); }
.journey-label-current { color: var(--color-text); font-weight: var(--weight-semibold); }

/* — placeholder visuals (no stock imagery) — */
.placeholder {
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
  background: repeating-linear-gradient(135deg, var(--color-inset) 0, var(--color-inset) 1px, var(--color-bg) 1px, var(--color-bg) 12px);
  display: flex; align-items: center; justify-content: center; text-align: center; padding: var(--space-6);
}
.placeholder-label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-tertiary); }

/* — subtle data-point texture (hero backdrop) — */
.dot-field {
  background-image: radial-gradient(var(--color-divider-strong) 1px, transparent 1px);
  background-size: 28px 28px;
}
.hero{padding:160px var(--container-padding) 120px;position:relative;overflow:hidden}
.hero-dots{position:absolute;inset:0;z-index:0}
.hero-inner{position:relative;z-index:1;max-width:820px}
.hero-kicker{margin-bottom:28px}
.hero h1{font-size:var(--text-4xl);margin-bottom:24px}
.hero-sub{font-size:var(--text-md);color:var(--color-text-secondary);font-weight:400;margin-bottom:16px;max-width:620px}
.hero-body{font-size:var(--text-base);color:var(--color-text-secondary);max-width:560px;margin-bottom:40px}
.hero-cta{display:flex;align-items:center;gap:28px;flex-wrap:wrap}
section{padding:96px var(--container-padding);border-top:1px solid var(--color-divider)}
.section-head{margin-bottom:56px;max-width:640px}
.section-head h2{font-size:var(--text-2xl);margin-top:14px}
.about-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:80px;align-items:start}
.about-body p{margin-bottom:18px;color:var(--color-text-secondary);font-size:var(--text-base)}
.explore-box{border:1px solid var(--color-divider);border-radius:var(--radius-md);padding:28px}
.explore-title{font-family:var(--font-mono);font-size:var(--text-2xs);text-transform:uppercase;letter-spacing:var(--tracking-label);color:var(--color-text-tertiary);margin-bottom:16px}
.explore-list{display:flex;flex-direction:column;gap:10px}
.explore-list span{font-size:var(--text-sm)}
.exp-card{max-width:720px}
.exp-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap}
.exp-dates{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-tertiary);white-space:nowrap}
.exp-list{margin:0;padding-left:20px;color:var(--color-text-secondary);font-size:var(--text-sm);display:flex;flex-direction:column;gap:8px}
.exp-list li{line-height:var(--leading-relaxed)}
.featured-top{display:flex;justify-content:space-between;align-items:flex-start;gap:40px;margin-bottom:40px;flex-wrap:wrap}
.featured-desc{max-width:560px;color:var(--color-text-secondary);font-size:var(--text-base)}
.featured-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-bottom:40px}
.featured-viz{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:40px}
.viz-shot{width:100%;aspect-ratio:9/20;object-fit:cover;object-position:top;border:1px solid var(--color-divider);border-radius:var(--radius-md);background:var(--color-inset)}
.coming-soon-card{max-width:640px}
.coming-soon-badge{font-family:var(--font-mono);font-size:var(--text-2xs);text-transform:uppercase;letter-spacing:var(--tracking-label);background:var(--color-accent-soft);color:var(--color-accent);border:1px solid var(--color-accent-soft-border);border-radius:var(--radius-pill);padding:4px 10px;margin-left:10px;vertical-align:middle}
.other-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px}
.journey-wrap{max-width:480px}
.skills-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}
.skill-cat-title{font-family:var(--font-mono);font-size:var(--text-2xs);text-transform:uppercase;letter-spacing:var(--tracking-label);color:var(--color-text-tertiary);margin-bottom:18px}
.skill-tags{display:flex;flex-wrap:wrap;gap:8px}
.gh-section{max-width:560px}
.contact-section{text-align:center}
.contact-section h2{font-size:var(--text-3xl);margin-bottom:32px}
.contact-links{display:flex;justify-content:center;gap:48px;flex-wrap:wrap}
footer{padding:48px var(--container-padding);border-top:1px solid var(--color-divider);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
footer .foot-brand{font-weight:600;font-size:var(--text-sm)}
footer .foot-sub{font-family:var(--font-mono);font-size:var(--text-2xs);color:var(--color-text-tertiary);margin-top:4px}
footer .foot-links{display:flex;gap:24px}
footer .foot-links a{font-size:var(--text-sm);color:var(--color-text-secondary)}
.copyright{font-family:var(--font-mono);font-size:var(--text-2xs);color:var(--color-text-tertiary)}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:4px;color:var(--color-text)}
.nav-toggle svg{width:22px;height:22px}
@media (max-width: 860px){
  .about-grid{grid-template-columns:1fr}
  .featured-stats{grid-template-columns:1fr 1fr}
  .featured-viz{grid-template-columns:1fr}
  .other-grid{grid-template-columns:1fr}
  .skills-grid{grid-template-columns:1fr}
  .hero{padding:120px 24px 80px}
  .hero h1{font-size:var(--text-3xl)}
  section{padding:64px 24px}
}
@media (max-width: 700px){
  .nav-toggle{display:inline-flex}
  .nav-links{
    position:absolute;top:100%;left:0;right:0;display:none;flex-direction:column;
    align-items:stretch;gap:0;background:var(--color-bg);border-bottom:1px solid var(--color-divider);
    padding:8px var(--container-padding) 16px;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0}
}
@media (max-width: 480px){
  .hero h1{font-size:var(--text-2xl)}
  .hero-sub{font-size:var(--text-base)}
  .hero-cta{gap:16px}
  .contact-links{gap:24px}
  footer{flex-direction:column;align-items:flex-start;text-align:left}
}

/* — view toggle (switches to the terminal view) — */
.nav-end { display: flex; align-items: center; gap: var(--space-8); }
.view-toggle {
  font-family: var(--font-sans); font-size: var(--text-xs); font-weight: var(--weight-medium); white-space: nowrap;
  color: var(--color-text-secondary); background: transparent; border: 1px solid var(--color-divider-strong);
  border-radius: var(--radius-sm); padding: 6px 12px; cursor: pointer;
  transition: color var(--duration-fast) var(--ease-standard), background var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}
.view-toggle:hover { color: var(--color-text); background: var(--color-inset); }
@media (max-width: 700px) { .nav-end { gap: var(--space-4); } }
@media (max-width: 480px) { .view-toggle { font-size: var(--text-2xs); padding: 6px 10px; } }