/* Riwaj Portfolio: Minimal Swiss Style. Tokens: navy #0F172A, accent #0369A1, bg #F8FAFC, card #FFFFFF. */

:root {
  --color-primary: #0f172a;
  --color-on-primary: #ffffff;
  --color-accent: #0369a1;
  --color-on-accent: #ffffff;
  --color-background: #f8fafc;
  --color-foreground: #020617;
  --color-card: #ffffff;
  --color-muted: #e8ecf1;
  --color-muted-foreground: #475569;
  --color-border: #e2e8f0;
  --color-ring: #0f172a;
  --header-h: 64px;
  --radius: 12px;
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;
  --space-section: 88px;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-foreground);
  background: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

/* Focus: visible ring on every interactive element */
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: 12px 20px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}
@media (min-width: 768px) {
  .container { padding-left: 24px; padding-right: 24px; }
}
@media (min-width: 1024px) {
  .container { padding-left: 32px; padding-right: 32px; }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-foreground);
  min-height: 44px;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 800;
  font-size: 1rem;
}
.brand-text { font-weight: 700; font-size: 1rem; letter-spacing: -0.01em; }
.brand-role { font-weight: 400; color: var(--color-muted-foreground); }
.site-nav { display: flex; align-items: center; gap: 8px; }
.site-nav a {
  color: var(--color-muted-foreground);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 10px 14px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-radius: 8px;
  transition: color 150ms ease, background 150ms ease;
}
.site-nav a:hover { color: var(--color-foreground); background: var(--color-muted); }
.nav-cta {
  background: var(--color-primary) !important;
  color: var(--color-on-primary) !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--color-accent) !important; }
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  color: var(--color-foreground);
}

/* ---------- Hero ---------- */
.hero { padding: 64px 0 48px; border-bottom: 1px solid var(--color-border); }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 40px; }
@media (min-width: 900px) {
  .hero { padding: 96px 0 72px; }
  .hero-grid { grid-template-columns: 1.5fr 1fr; gap: 56px; align-items: start; }
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  background: #e0f2fe;
  border: 1px solid #bae6fd;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}
h1 {
  font-size: 2.5rem;
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin-bottom: 16px;
}
@media (min-width: 768px) { h1 { font-size: 3.5rem; } }
.h1-muted { color: var(--color-muted-foreground); font-weight: 700; }
.lede { font-size: 1.125rem; color: var(--color-muted-foreground); max-width: 38rem; }
.lede strong { color: var(--color-foreground); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 32px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
  transition: background 200ms ease, color 200ms ease, border-color 200ms ease, transform 200ms ease;
}
.btn-primary { background: var(--color-accent); color: var(--color-on-accent); }
.btn-primary:hover { background: #075985; transform: translateY(-1px); }
.btn-secondary {
  background: var(--color-card);
  color: var(--color-foreground);
  border-color: var(--color-border);
}
.btn-secondary:hover { border-color: var(--color-primary); }
.btn-outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}
.btn-outline-light:hover { border-color: #fff; background: rgba(255,255,255,0.08); }
.btn-light { background: #fff; color: var(--color-primary); }
.btn-light:hover { background: var(--color-muted); }

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
}
.hero-facts dt { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-muted-foreground); margin-bottom: 4px; }
.hero-facts dd { font-size: 0.9375rem; font-weight: 600; }

.hero-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
}
.hero-card h2 { font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-muted-foreground); margin-bottom: 16px; }
.hero-card ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.hero-card li { display: flex; gap: 10px; align-items: flex-start; font-size: 0.9375rem; font-weight: 500; }
.hero-card li svg { flex-shrink: 0; margin-top: 4px; color: var(--color-accent); }
.hero-numbers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  text-align: left;
}
.hero-numbers strong { display: block; font-size: 1.5rem; letter-spacing: -0.02em; }
.hero-numbers span { font-size: 0.8125rem; color: var(--color-muted-foreground); }

/* ---------- Strip ---------- */
.strip { border-bottom: 1px solid var(--color-border); background: var(--color-card); }
.strip-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  padding-top: 14px;
  padding-bottom: 14px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-muted-foreground);
}

/* ---------- Sections ---------- */
.section { padding: var(--space-section) 0; }
.section-alt { background: var(--color-card); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.section-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 12px;
}
.section-label-light { color: #7dd3fc; }
.section-head { max-width: 44rem; margin-bottom: 40px; }
.section-head h2, .about-grid h2 {
  font-size: 1.875rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 12px;
}
@media (min-width: 768px) { .section-head h2, .about-grid h2 { font-size: 2.25rem; } }
.section-head p, .about-grid p { color: var(--color-muted-foreground); font-size: 1.0625rem; }

/* ---------- Work ---------- */
.work-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 768px) { .work-grid { grid-template-columns: 1fr 1fr; gap: 20px; } }
.work-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 200ms ease, box-shadow 200ms ease;
}
.section-alt .work-card, .section:not(.section-alt) .work-card { background: var(--color-card); }
#work .work-card { background: var(--color-card); box-shadow: 0 1px 2px rgba(2,6,23,0.04); }
.work-card:hover { border-color: #94a3b8; box-shadow: 0 8px 24px rgba(2,6,23,0.08); }
.work-index { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--color-muted-foreground); }
.work-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  margin: 8px 0 12px;
}
.work-card h3 { font-size: 1.1875rem; letter-spacing: -0.01em; margin-bottom: 10px; line-height: 1.35; }
.work-card p { color: var(--color-muted-foreground); font-size: 0.9375rem; margin-bottom: 16px; }
.work-card p:last-of-type { flex-grow: 1; }
.work-card code { font-family: var(--font-mono); font-size: 0.85em; background: var(--color-muted); padding: 1px 6px; border-radius: 4px; }
.tag-list { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--color-muted);
  color: var(--color-primary);
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 500;
}

/* ---------- Timeline ---------- */
.timeline { list-style: none; display: flex; flex-direction: column; gap: 0; }
.timeline-item { display: grid; grid-template-columns: 24px 1fr; gap: 16px; position: relative; padding-bottom: 32px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 28px;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}
.timeline-item:last-child::before { display: none; }
.timeline-marker {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-card);
  border: 2px solid var(--color-accent);
  position: relative;
  z-index: 1;
  margin-top: 4px;
}
.timeline-marker::after {
  content: '';
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--color-accent);
}
.timeline-body {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}
.timeline-head { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 12px; }
.timeline-head h3 { font-size: 1.0625rem; }
.timeline-meta { font-size: 0.875rem; color: var(--color-muted-foreground); margin-top: 2px; }
.timeline-head time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  background: #e0f2fe;
  border: 1px solid #bae6fd;
  padding: 6px 12px;
  border-radius: 999px;
  white-space: nowrap;
  align-self: flex-start;
}
.timeline-body ul { margin-left: 18px; color: var(--color-muted-foreground); font-size: 0.9375rem; display: flex; flex-direction: column; gap: 8px; }
.timeline-body strong { color: var(--color-foreground); }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 640px) { .skills-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1024px) { .skills-grid { grid-template-columns: 1fr 1fr 1fr; } }
.skill-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  border-top: 3px solid var(--color-primary);
}
.skill-card h3 { font-size: 1rem; margin-bottom: 8px; }
.skill-card p { font-size: 0.9375rem; color: var(--color-muted-foreground); }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1fr; gap: 40px; }
@media (min-width: 900px) { .about-grid { grid-template-columns: 1.4fr 1fr; gap: 56px; } }
.about-grid p + p { margin-top: 16px; }
.creds {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  align-self: start;
}
.creds h3 { font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-muted-foreground); margin-bottom: 16px; }
.creds ul { list-style: none; display: flex; flex-direction: column; gap: 16px; }
.creds li { display: flex; flex-direction: column; gap: 2px; }
.creds strong { font-size: 0.9375rem; }
.creds span { font-size: 0.8125rem; color: var(--color-muted-foreground); }

/* ---------- Contact ---------- */
.contact-panel {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: 16px;
  padding: 40px 24px;
  text-align: left;
}
@media (min-width: 768px) { .contact-panel { padding: 64px; } }
.contact-panel h2 { font-size: 1.875rem; letter-spacing: -0.02em; margin-bottom: 12px; }
@media (min-width: 768px) { .contact-panel h2 { font-size: 2.5rem; } }
.contact-panel > p { color: #cbd5e1; max-width: 36rem; font-size: 1.0625rem; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0; }
.contact-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
@media (min-width: 640px) { .contact-list { flex-direction: row; flex-wrap: wrap; gap: 12px 32px; } }
.contact-list li { display: flex; align-items: center; gap: 10px; font-size: 0.9375rem; min-height: 44px; }
.contact-list svg { color: #7dd3fc; flex-shrink: 0; }
.contact-list a { color: #fff; text-decoration: none; border-bottom: 1px solid rgba(255,255,255,0.3); }
.contact-list a:hover { border-bottom-color: #fff; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--color-border); padding: 28px 0; }
.footer-inner { display: flex; justify-content: space-between; gap: 8px 24px; flex-wrap: wrap; font-size: 0.875rem; color: var(--color-muted-foreground); }

/* ---------- Mobile nav ---------- */
@media (max-width: 760px) {
  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 16px 16px;
    gap: 4px;
  }
  .site-nav.open { display: flex; }
  .nav-toggle { display: inline-flex; }
  .hero-facts { grid-template-columns: 1fr 1fr; }
}

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