/* ============================================================
   PORTFOLIO — Wilfredo R. Ronsini Jr.
   style.css — shared styles, dark-first
   ============================================================ */

/* ---------- Theme variables ---------- */
:root {
  --bg: #f6f8fa;
  --bg2: #ffffff;
  --bg3: #eef1f5;
  --border: #d0d7de;
  --text: #1a1f2e;
  --text2: #57606a;
  --accent: #0969da;
  --accent2: #6e40c9;
  --accent-rgb: 9, 105, 218;
  --nav-bg: rgba(246,248,250,0.85);
  --card-shadow: 0 1px 4px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.06);
  --radius: 10px;
  --radius-sm: 6px;
  --transition: 0.2s ease;
}

html.dark {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #1e2430;
  --border: #30363d;
  --text: #e6edf3;
  --text2: #8b949e;
  --accent: #4493f8;
  --accent2: #a78bfa;
  --accent-rgb: 68, 147, 248;
  --nav-bg: rgba(13,17,23,0.85);
  --card-shadow: 0 1px 4px rgba(0,0,0,0.3), 0 4px 20px rgba(0,0,0,0.25);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

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

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

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 58px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.nav-logo:hover { text-decoration: none; color: var(--accent); }
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  flex: 1;
}

.nav-links a {
  color: var(--text2);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  background: var(--bg3);
  text-decoration: none;
}
.nav-links a.active { color: var(--accent); }

.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  font-size: 0.78rem;
  font-weight: 600;
}
.lang-toggle a {
  padding: 0.25rem 0.6rem;
  color: var(--text2);
  transition: color var(--transition), background var(--transition);
}
.lang-toggle a:hover { text-decoration: none; color: var(--text); }
.lang-toggle a.active {
  background: var(--accent);
  color: #fff;
  border-radius: 20px;
}

/* Theme button */
.theme-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.25rem 0.65rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text2);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  white-space: nowrap;
}
.theme-btn:hover { color: var(--text); background: var(--border); }
.theme-btn .icon-sun  { display: none; }
.theme-btn .icon-moon { display: none; }
.theme-btn .icon-sys  { display: inline; }
html.dark .theme-btn .icon-moon { display: inline; }
html.dark .theme-btn .icon-sun  { display: none; }
html.dark .theme-btn .icon-sys  { display: none; }
/* When forced light (data-theme=light set by JS): */
html:not(.dark)[data-forced-theme="light"] .theme-btn .icon-sun  { display: inline; }
html:not(.dark)[data-forced-theme="light"] .theme-btn .icon-moon { display: none; }
html:not(.dark)[data-forced-theme="light"] .theme-btn .icon-sys  { display: none; }

/* Mobile nav toggle */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  padding: 0.25rem;
  font-size: 1.3rem;
}

/* ---------- Page layout ---------- */
.page-wrapper { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Hero ---------- */
.hero {
  padding: 5rem 1.5rem 4rem;
  max-width: 1100px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.hero-tagline {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text2);
  max-width: 640px;
  margin-bottom: 1.5rem;
  line-height: 1.55;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
  font-size: 0.875rem;
  color: var(--text2);
}
.hero-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid transparent;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { opacity: 0.88; }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover {
  background: var(--bg3);
  border-color: var(--text2);
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}
.btn-ghost:hover { background: rgba(var(--accent-rgb), 0.08); }

/* ---------- Section ---------- */
.section {
  padding: 4rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0 1.5rem;
}

.section-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.section-lead {
  font-size: 1.05rem;
  color: var(--text2);
  max-width: 640px;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

/* ---------- Stack grid ---------- */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.stack-group {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.stack-group:hover {
  border-color: var(--accent);
  box-shadow: var(--card-shadow);
}

.stack-group-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text2);
  margin-bottom: 0.65rem;
}

.stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15rem 0.55rem;
  font-size: 0.78rem;
  font-weight: 500;
}

/* ---------- Card grid (case studies / pillars) ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.card:hover {
  border-color: var(--accent);
  box-shadow: var(--card-shadow);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.card-body {
  font-size: 0.9rem;
  color: var(--text2);
  line-height: 1.6;
  flex: 1;
}

.card-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: auto;
}
.card-link:hover { text-decoration: underline; }

/* Case study card variant */
.case-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.case-card:hover {
  border-color: var(--accent);
  box-shadow: var(--card-shadow);
  transform: translateY(-2px);
}

.case-card-eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.case-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
}

.case-card-impact {
  font-size: 0.9rem;
  color: var(--text2);
  line-height: 1.55;
}

.case-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.25rem;
}

.case-card-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

/* ---------- Prose sections (AI, Mainframe pages) ---------- */
.prose {
  max-width: 720px;
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  color: var(--text);
}
.prose h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.prose p {
  color: var(--text2);
  margin-bottom: 1rem;
  line-height: 1.7;
  font-size: 1rem;
}
.prose ul {
  list-style: none;
  padding: 0;
  margin-bottom: 1rem;
}
.prose ul li {
  color: var(--text2);
  padding: 0.2rem 0;
  padding-left: 1.2rem;
  position: relative;
  font-size: 1rem;
  line-height: 1.65;
}
.prose ul li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* Principle blocks */
.principle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem;
}

.principle-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.25rem;
}
.principle-card h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}
.principle-card p {
  font-size: 0.85rem;
  color: var(--text2);
  margin: 0;
  line-height: 1.55;
}

/* Timeline (Mainframe page) */
.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin: 1.5rem 0;
}
.timeline-item { position: relative; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -2.45rem;
  top: 0.45rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}
.timeline-date {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}
.timeline-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.35rem;
}
.timeline-body {
  font-size: 0.9rem;
  color: var(--text2);
  line-height: 1.6;
}

/* Bridge callout */
.callout {
  background: rgba(var(--accent-rgb), 0.07);
  border: 1px solid rgba(var(--accent-rgb), 0.25);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2rem 0;
}
.callout p { color: var(--text); margin: 0; font-size: 0.975rem; line-height: 1.65; }
.callout strong { color: var(--accent); }

/* Contact page */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.contact-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  transition: border-color var(--transition), transform var(--transition);
}
.contact-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}
.contact-card-icon { font-size: 1.4rem; flex-shrink: 0; }
.contact-card-label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text2); margin-bottom: 0.2rem; }
.contact-card-value { font-size: 0.9rem; font-weight: 600; color: var(--text); word-break: break-all; }
.contact-card-value a { color: var(--text); }
.contact-card-value a:hover { color: var(--accent); text-decoration: none; }

.cv-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  padding: 3.5rem 1.5rem 2.5rem;
  max-width: 1100px;
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}
.page-hero .hero-eyebrow { margin-bottom: 0.5rem; }
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.page-hero .hero-tagline { margin-bottom: 0; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 5rem;
  padding: 2rem 1.5rem;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.82rem;
  color: var(--text2);
}
.footer a { color: var(--text2); }
.footer a:hover { color: var(--accent); text-decoration: none; }
.footer-links { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------- Utility ---------- */
.text-accent { color: var(--accent); }
.mt-sm { margin-top: 0.75rem; }
.mt-md { margin-top: 1.5rem; }
.mt-lg { margin-top: 2.5rem; }

/* ---------- Responsive ---------- */
@media (max-width: 680px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 58px; left: 0; right: 0;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    gap: 0.1rem;
  }
  .nav-hamburger { display: block; }

  .hero { padding: 3rem 1.25rem 2.5rem; }
  .section { padding: 2.5rem 1.25rem; }
  .card-grid { grid-template-columns: 1fr; }
  .stack-grid { grid-template-columns: 1fr 1fr; }
  .principle-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer { flex-direction: column; align-items: flex-start; }
}