/* ==========================================================================
   Kristo — portfolio stylesheet
   Palette: Paper / Ink / Slate / Ultramarine, with a graph-paper hero.
   Type:    STIX Two Text (display) · IBM Plex Sans (body) · IBM Plex Mono (labels)
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  --paper:   #F7F8FA;
  --card:    #FFFFFF;
  --ink:     #0F1626;
  --slate:   #59647A;
  --accent:  #2036D6;   /* ultramarine */
  --accent-dark: #16249B;
  --grid:    #E4E8F0;
  --hairline:#D8DDE7;

  --font-display: "STIX Two Text", Georgia, serif;
  --font-body:    "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --font-mono:    "IBM Plex Mono", "SF Mono", Consolas, monospace;

  --max-width: 1080px;
  --radius: 6px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--accent); text-decoration: none; }

.mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  color: var(--ink);
}

h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); margin-bottom: 1.25rem; }
h3 { font-size: 1.2rem; }

.eyebrow {
  color: var(--accent);
  margin-bottom: 1rem;
  text-transform: uppercase;
}

/* Visible keyboard focus */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 248, 250, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--ink);
}

.brand-dot { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 1.6rem; }

.nav-links a {
  color: var(--slate);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  transition: color 160ms ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -4px;
  width: 100%; height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms ease;
}

.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-cta {
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.35rem 0.9rem;
  color: var(--accent) !important;
}
.nav-cta::after { display: none; }
.nav-cta:hover { background: var(--accent); color: #fff !important; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  /* graph-paper grid */
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  border-bottom: 1px solid var(--hairline);
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(5rem, 12vw, 9rem) 1.5rem clamp(4rem, 10vw, 7rem);
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  margin-bottom: 1.4rem;
  max-width: 15ch;
}

.hero-bio {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--slate);
  max-width: 52ch;
  margin-bottom: 2.2rem;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-annotation {
  margin-top: 3rem;
  color: var(--slate);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease,
              transform 160ms ease, box-shadow 160ms ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(32, 54, 214, 0.25);
}

.btn-ghost {
  border-color: var(--hairline);
  color: var(--ink);
  background: var(--card);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- Sections ---------- */
.section { padding: clamp(4rem, 9vw, 7rem) 0; }
.section-alt { background: var(--card); border-block: 1px solid var(--hairline); }

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* scroll reveal (JS adds .revealed) */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}
.reveal.revealed { opacity: 1; transform: none; }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.about-copy p { color: var(--slate); margin-bottom: 1.1rem; }
.about-copy strong { color: var(--ink); font-weight: 600; }

.about-skills {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.skills-heading {
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.skill-row {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.7rem 0;
  border-bottom: 1px dashed var(--hairline);
}
.skill-row:last-child { border-bottom: none; }

.skill-row dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate);
}

.skill-row dd { font-weight: 500; }

/* ---------- Projects ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.project-card {
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: 0 14px 34px rgba(15, 22, 38, 0.10);
}

.card-index { color: var(--accent); margin-bottom: 0.9rem; }

.project-card h3 { margin-bottom: 0.8rem; }

.card-desc {
  color: var(--slate);
  font-size: 0.95rem;
  flex-grow: 1;
  margin-bottom: 1.25rem;
}

.tech-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.4rem;
}

.tech-list li {
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 0.15rem 0.65rem;
  font-size: 0.72rem;
  color: var(--slate);
  background: var(--card);
}

.card-links { display: flex; gap: 1.25rem; }

.card-links a {
  font-weight: 600;
  font-size: 0.9rem;
  position: relative;
  transition: color 160ms ease;
}
.card-links a:hover { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 4px; }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3.5rem;
  align-items: start;
}

.contact-copy p { color: var(--slate); margin-bottom: 1.5rem; }

.contact-links { list-style: none; }
.contact-links li { padding: 0.5rem 0; border-bottom: 1px dashed var(--hairline); }
.contact-links a { color: var(--ink); transition: color 160ms ease; }
.contact-links a:hover { color: var(--accent); }

.contact-form {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 2rem;
}

.form-field { margin-bottom: 1.25rem; }

.form-field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate);
  margin-bottom: 0.4rem;
}

.form-field input,
.form-field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 0.7rem 0.9rem;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(32, 54, 214, 0.12);
  outline: none;
}

.form-status { margin-top: 0.9rem; color: var(--slate); min-height: 1.2em; }
.form-status.ok { color: #0B7A4B; }
.form-status.error { color: #B3261E; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--hairline); padding: 1.6rem 0; }

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--slate);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .about-grid,
  .contact-grid { grid-template-columns: 1fr; gap: 2.25rem; }
  .project-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.85rem; }
  .hero-actions .btn { width: 100%; text-align: center; }
}

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