/* ==========================================================================
   style.css
   Design system: "Datasheet" — an engineering portfolio styled like a
   component spec sheet. Warm paper background, hairline rules, monospace
   annotations that carry real information (section numbers, status tags).
   ========================================================================== */

:root {
  --bg: #FAFAF8;
  --panel: #F0EEE7;
  --panel-raised: #FFFFFF;
  --ink: #1A1D1B;
  --ink-soft: #5B5F5A;
  --accent: #2D5C3F;       /* circuit-board green, muted */
  --accent-soft: #E4EBE5;
  --accent-warm: #C4602A;  /* solder-mask orange, for highlights/CTAs */
  --line: #D8D4C9;
  --line-strong: #B9B4A6;
  --radius: 3px;
  --max-width: 1140px;

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
}

/* Faint graph-paper texture behind everything — subtle, not decorative noise */
body {
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  background-attachment: fixed;
  background-position: -1px -1px;
  background-color: var(--bg);
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--bg);
  opacity: 0.94;
  z-index: -1;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

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

.mono { font-family: var(--font-mono); }

.container-narrow {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* --------------------------------------------------------------------------
   Spec-label: small monospace tag used throughout, like a datasheet field
   label (e.g. "FIG. 01", "REV 2.1", "STATUS: ACTIVE"). This is the
   recurring structural device that ties the whole site together.
   -------------------------------------------------------------------------- */
.spec-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.spec-label::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  display: inline-block;
}

.section-number {
  font-family: var(--font-mono);
  color: var(--line-strong);
  font-size: 0.85rem;
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Navbar
   -------------------------------------------------------------------------- */
.navbar-custom {
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}
.navbar-custom .navbar-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}
.navbar-custom .navbar-brand .brand-mark {
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.95rem;
  margin-right: 2px;
}
.navbar-custom .nav-link {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  padding: 8px 16px !important;
  transition: color 0.2s;
  position: relative;
}
.navbar-custom .nav-link:hover,
.navbar-custom .nav-link.active {
  color: var(--ink);
}
.navbar-custom .nav-link.active::after {
  content: '';
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 2px;
  height: 2px;
  background: var(--accent-warm);
}

/* --------------------------------------------------------------------------
   Hero — styled like a component datasheet header
   -------------------------------------------------------------------------- */
.hero {
  padding: 96px 0 72px;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: start;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  display: block;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1.05;
  margin-bottom: 16px;
}
.hero-tagline {
  font-size: 1.25rem;
  color: var(--ink-soft);
  max-width: 540px;
  margin-bottom: 28px;
}
.hero-subtitle {
  max-width: 560px;
  color: var(--ink-soft);
  margin-bottom: 32px;
}

/* The "spec table" — signature element, like a chip's pin/parameter table */
.spec-table {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  border: 1px solid var(--line-strong);
  background: var(--panel-raised);
  min-width: 260px;
}
.spec-table .spec-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.spec-table .spec-row:last-child { border-bottom: none; }
.spec-table .spec-key { color: var(--ink-soft); }
.spec-table .spec-val { color: var(--ink); font-weight: 600; text-align: right; }
.spec-table .spec-val.status-active { color: var(--accent); }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .spec-table { min-width: 0; }
}

/* --------------------------------------------------------------------------
   Section scaffolding
   -------------------------------------------------------------------------- */
.section {
  padding: 80px 0;
  border-bottom: 1px solid var(--line);
}
.section-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 40px;
}
.section-header h2 {
  font-size: 1.9rem;
}
.section-header .rule {
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* --------------------------------------------------------------------------
   Skills — animated bars styled like signal-strength / spec gauges
   -------------------------------------------------------------------------- */
.skill-category-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-warm);
  margin-bottom: 12px;
  margin-top: 28px;
}
.skill-row {
  margin-bottom: 20px;
}
.skill-row-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}
.skill-name { font-weight: 600; }
.skill-pct {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
}
.skill-desc {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.skill-track {
  height: 6px;
  background: var(--panel);
  border: 1px solid var(--line);
  overflow: hidden;
}
.skill-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 1.1s cubic-bezier(0.16, 1, 0.3, 1);
}
.skill-row.in-view .skill-fill {
  width: var(--target-width);
}

/* --------------------------------------------------------------------------
   Projects
   -------------------------------------------------------------------------- */
.project-card {
  background: var(--panel-raised);
  border: 1px solid var(--line);
  padding: 28px;
  margin-bottom: 20px;
  transition: border-color 0.2s, transform 0.2s;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.project-card .project-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--line-strong);
  margin-bottom: 8px;
  display: block;
}
.project-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}
.project-card .project-summary {
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.project-card .tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 9px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--radius);
}
.project-links a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin-right: 16px;
}
.featured-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-warm);
  border: 1px solid var(--accent-warm);
  padding: 2px 8px;
  margin-left: 10px;
}

/* --------------------------------------------------------------------------
   Experience timeline — order carries real information here, so the
   numbering/connector device is justified.
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: 28px;
  border-left: 2px solid var(--line);
}
.timeline-item {
  position: relative;
  padding-bottom: 36px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 4px;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border: 2px solid var(--bg);
}
.timeline-item.current::before { background: var(--accent-warm); }
.timeline-dates {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-bottom: 4px;
}
.timeline-item h3 { font-size: 1.15rem; margin-bottom: 2px; }
.timeline-org { color: var(--accent); font-weight: 500; margin-bottom: 8px; }

/* --------------------------------------------------------------------------
   Blog
   -------------------------------------------------------------------------- */
.blog-card {
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
}
.blog-card:first-child { padding-top: 0; }
.blog-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
}
.blog-card h3 { margin: 6px 0 8px; font-size: 1.25rem; }
.blog-excerpt { color: var(--ink-soft); }
.blog-content {
  font-size: 1.05rem;
  line-height: 1.75;
}
.blog-content p { margin-bottom: 1.2em; }
.blog-content img { max-width: 100%; }

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
}
@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; }
}
.contact-info-item {
  margin-bottom: 18px;
}
.contact-info-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  display: block;
  margin-bottom: 4px;
}
.form-control {
  background: var(--panel-raised);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink);
  padding: 12px 14px;
}
.form-control:focus {
  background: var(--panel-raised);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  color: var(--ink);
}
.form-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
}
.btn-primary-custom {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 28px;
  border-radius: var(--radius);
  transition: background 0.2s;
}
.btn-primary-custom:hover {
  background: #234a32;
  color: #fff;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
footer {
  padding: 40px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   Alerts (used by contact form + admin)
   -------------------------------------------------------------------------- */
.alert-custom {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 14px 18px;
  font-size: 0.92rem;
  margin-bottom: 20px;
}
.alert-success-custom {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: #234a32;
}
.alert-error-custom {
  background: #FBEAE2;
  border-color: var(--accent-warm);
  color: #8a4019;
}