/* ═══════════════════════════════════════════════
   Software Engineering for Knowledge Systems
   Personal website — Ralph Brandão Vidal
   ═══════════════════════════════════════════════ */

:root {
  --bg: #09090b;
  --bg2: #121214;
  --bg3: #1a1a1e;
  --surface: #18181b;
  --text: #fafafa;
  --text2: #a1a1aa;
  --muted: #71717a;
  --accent: #3b82f6;
  --accent-dim: rgba(59,130,246,.12);
  --accent-glow: rgba(59,130,246,.25);
  --border: #27272a;
  --border-light: #3f3f46;
  --radius: 10px;
  --max-width: 1200px;
  --gap: clamp(60px,10vw,120px);
}

/* ── Reset ──────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{
  background:var(--bg);
  color:var(--text);
  font:400 1rem/1.7 system-ui,-apple-system,'Segoe UI',Inter,sans-serif;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#60a5fa}
::selection{background:var(--accent);color:#fff}

/* ── Typography ─────────────────────────── */
h1,h2,h3,h4{font-weight:600;letter-spacing:-0.02em;line-height:1.15;color:var(--text)}
h1{font-size:clamp(2.8rem,5.5vw,4.2rem)}
h2{font-size:clamp(1.8rem,3.5vw,2.6rem)}
h3{font-size:clamp(1.1rem,2vw,1.35rem)}
p{margin-bottom:1em;color:var(--text2)}
.eyebrow{
  font-size:0.75rem;font-weight:600;letter-spacing:0.14em;
  text-transform:uppercase;color:var(--accent);margin-bottom:0.75rem;
}
.lead{font-size:clamp(1.05rem,1.8vw,1.2rem);color:var(--muted);max-width:60ch}

/* ── Layout ─────────────────────────────── */
.wrap{max-width:var(--max-width);margin:0 auto;padding:0 clamp(20px,5vw,48px)}
section{padding:var(--gap) 0}
.section-header{margin-bottom:56px}
.section-header h2{margin-bottom:0.4em}
.section-header .lead{max-width:none}

/* ── Navigation ─────────────────────────── */
nav{
  position:fixed;inset:0 0 auto 0;z-index:1000;
  background:rgba(9,9,11,.82);backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(255,255,255,.06);
}
nav .wrap{display:flex;justify-content:space-between;align-items:center;height:64px}
.logo{font-weight:700;font-size:1rem;letter-spacing:-0.02em;color:var(--text)}
.nav-links{display:flex;gap:20px;align-items:center}
.nav-links a{color:var(--muted);font-size:0.88rem;transition:color .2s}
.nav-links a:hover,.nav-links a:focus-visible{color:var(--text)}
.nav-cta{
  background:var(--accent);color:#fff!important;
  padding:7px 16px;border-radius:7px;font-weight:600;font-size:0.85rem;
}
.nav-cta:hover{background:#2563eb}

/* ── Hero ────────────────────────────────── */
.hero{
  min-height:85vh;display:flex;align-items:flex-start;
  background-color:var(--bg);
  background-image:
    linear-gradient(rgba(0,0,0,0.45),rgba(0,0,0,0.45)),
    url('../img/hero/cropped-fraz3.png');
  background-size:cover;
  background-position:center;
}
.hero .wrap{max-width:1400px}
.hero-inner{padding:112px 0 96px;max-width:780px}
.hero-inner h1{
  margin-bottom:0.25em;font-weight:700;letter-spacing:-0.04em;
  font-size:clamp(2.8rem,6.5vw,5.2rem);line-height:1.08;
}
.hero-inner .accent{color:var(--accent)}
.hero .lead{font-size:clamp(1.05rem,1.8vw,1.25rem);margin-bottom:36px;color:var(--text2);max-width:56ch}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 26px;border-radius:8px;
  font-weight:600;font-size:0.95rem;transition:all .2s;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#2563eb;color:#fff}
.btn-secondary{
  background:transparent;color:var(--text);
  border:1px solid var(--border-light);
}
.btn-secondary:hover{background:var(--bg3);border-color:var(--muted);color:var(--text)}

/* ── Capabilities ────────────────────────── */
.cap-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.cap-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px;
  transition:border-color .25s;
}
.cap-card:hover{border-color:var(--accent)}
.cap-card .icon{font-size:1.4rem;margin-bottom:18px;opacity:.8}
.cap-card h3{font-size:1.05rem;margin-bottom:14px;font-weight:600}
.cap-card ul{list-style:none;padding:0}
.cap-card li{font-size:0.9rem;color:var(--text2);padding:3px 0;padding-left:16px;position:relative}
.cap-card li::before{
  content:'';position:absolute;left:0;top:12px;
  width:5px;height:5px;border-radius:50%;background:var(--accent);opacity:.6;
}

/* ── Projects ────────────────────────────── */
.project-cards{display:flex;flex-direction:column;gap:20px}
.project-card{
  display:grid;grid-template-columns:minmax(0,1fr) 440px;gap:0;
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
  transition:border-color .25s;
}
.project-card:hover{border-color:var(--accent)}
.project-card .text{padding:clamp(28px,3vw,36px);display:flex;flex-direction:column;justify-content:center}
.project-card .text .meta{margin-bottom:14px}
.project-card .text .meta span{
  font-size:0.72rem;font-weight:600;letter-spacing:0.08em;
  text-transform:uppercase;color:var(--accent);
  background:var(--accent-dim);padding:4px 10px;border-radius:5px;
}
.project-card .text h3{font-size:1.25rem;margin-bottom:0.5em}
.project-card .text p{font-size:0.9rem;color:var(--text2);margin-bottom:14px}
.project-card .text .tags{display:flex;gap:7px;flex-wrap:wrap}
.project-card .text .tags span{
  font-size:0.75rem;padding:4px 10px;
  background:var(--bg3);color:var(--muted);
  border-radius:5px;border:1px solid var(--border);
}
.project-card .text .card-link{
  display:inline-flex;align-items:center;gap:6px;margin-top:14px;
  font-size:0.88rem;font-weight:500;
}
.project-card .visual{overflow:hidden;background:var(--bg3);display:flex;align-items:flex-start;justify-content:center}
.project-card .visual img{width:100%;height:auto;max-height:none;object-fit:contain;object-position:center top}
@media(max-width:768px){
  .project-card{grid-template-columns:1fr}
  .project-card .visual{order:-1;max-height:200px}
}

/* ── Case Studies ────────────────────────── */
.case-study{
  display:grid;grid-template-columns:1fr 280px;gap:0;
  border-top:1px solid var(--border);padding:0;
}
.case-study:last-child{border-bottom:1px solid var(--border)}
.case-study .text{padding:clamp(28px,4vw,48px)}
.case-study h3{font-size:1.5rem;margin-bottom:0.5em}
.case-study .meta{display:flex;gap:16px;color:var(--muted);font-size:0.88rem;margin-bottom:16px}
.case-study .visual img{width:100%;height:100%;object-fit:cover;min-height:260px}
.case-study .read-more{
  display:inline-flex;align-items:center;gap:6px;margin-top:16px;
  font-weight:500;color:var(--accent);transition:gap .2s;
}
.case-study .read-more:hover{gap:12px}
@media(max-width:768px){
  .case-study{grid-template-columns:1fr}
  .case-study .visual img{min-height:180px}
}

/* ── Private AI Section ───────────────────── */
.private-ai-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;
}
.private-ai-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px;
}
.private-ai-card h3{font-size:1rem;margin-bottom:8px}
.private-ai-card p{font-size:0.9rem;color:var(--text2);margin:0}

/* ── Services Grid ───────────────────────── */
.services-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;
}
.service-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px;
  transition:border-color .25s;
}
.service-card:hover{border-color:var(--accent)}
.service-card .num{
  font-size:0.75rem;font-weight:700;color:var(--accent);
  letter-spacing:0.1em;margin-bottom:12px;
}
.service-card h3{font-size:1.05rem;margin-bottom:8px}
.service-card p{font-size:0.9rem;color:var(--text2);margin:0}

/* ── Tech Stack ──────────────────────────── */
.stack-section{margin-bottom:36px}
.stack-section h3{font-size:0.85rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:0.1em;margin-bottom:14px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips span{
  font-size:0.82rem;padding:7px 16px;
  background:var(--bg2);color:var(--text2);
  border-radius:7px;border:1px solid var(--border);
  font-weight:500;transition:border-color .2s;
}
.chips span:hover{border-color:var(--accent);color:var(--text)}

/* ── Timeline ────────────────────────────── */
.timeline{position:relative}
.timeline::before{
  content:'';position:absolute;left:90px;top:0;bottom:0;
  width:1px;background:var(--border);
}
.timeline-item{display:grid;grid-template-columns:100px 1fr;gap:32px;margin-bottom:48px}
.timeline-year{
  font-size:0.78rem;font-weight:600;color:var(--accent);
  text-align:right;padding-top:3px;
}
.timeline-content h3{margin-bottom:0}
.timeline-context{color:var(--muted);font-size:0.82rem;margin-bottom:10px}
.timeline-content p{font-size:0.9rem;color:var(--text2);max-width:60ch}
.timeline-stack{
  font-size:0.75rem!important;color:var(--muted)!important;
  font-family:'SF Mono','Fira Code','Consolas',monospace;
  margin-top:8px;word-break:break-word;
}
.timeline-img{margin-top:16px;border-radius:var(--radius);overflow:hidden;max-width:480px}
.timeline-img img{width:100%;display:block;border-radius:var(--radius)}
@media(max-width:768px){
  .timeline::before{left:16px}
  .timeline-item{grid-template-columns:40px 1fr;gap:20px}
  .timeline-year{text-align:left;font-size:0.72rem}
}

/* ── About ───────────────────────────────── */
.about-layout{max-width:680px}
.about-text h2{margin-bottom:0.5em}
.about-text .location{color:var(--accent);font-size:0.88rem;margin-bottom:1.5em}

/* ── Contact ─────────────────────────────── */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.contact-link{
  display:flex;flex-direction:column;gap:2px;
  padding:20px 24px;background:var(--bg2);
  border:1px solid var(--border);border-radius:var(--radius);
  color:var(--text);font-size:0.9rem;
  transition:border-color .2s;
}
.contact-link:hover{border-color:var(--accent);color:var(--text)}
.contact-link .label{color:var(--muted);font-size:0.78rem;text-transform:uppercase;letter-spacing:0.08em}

/* ── Footer ──────────────────────────────── */
footer{
  padding:48px 0 28px;border-top:1px solid var(--border);
  color:var(--muted);font-size:0.82rem;
}
.footer-inner{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center}
.footer-brand{display:flex;flex-direction:column;gap:5px}
.footer-brand strong{color:var(--text);font-size:.95rem}
.footer-brand span{font-size:.78rem;color:var(--muted)}
.footer-contact{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.footer-contact a{display:inline-flex;align-items:center;gap:8px;padding:8px 11px;border:1px solid var(--border);border-radius:7px;color:var(--text2);background:var(--bg2);transition:border-color .2s,color .2s,background .2s}
.footer-contact a:hover{border-color:var(--accent);color:var(--text);background:var(--bg3)}
.footer-contact svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.footer-contact a:first-child svg,.footer-contact a:nth-child(3) svg{fill:currentColor;stroke:none}
.footer-bottom{grid-column:1/-1;padding-top:20px;border-top:1px solid var(--border);font-size:.75rem;color:var(--muted)}

/* ── Background bands ────────────────────── */
.bg-dark{background:var(--bg)}
.bg-mid{background:var(--bg2)}

/* ── Animations ──────────────────────────── */
.reveal{opacity:1;transform:none;transition:none}
.reveal.visible{opacity:1;transform:none}
.reveal-delay-1{transition-delay:.1s}
.reveal-delay-2{transition-delay:.2s}
.reveal-delay-3{transition-delay:.3s}

/* ── Focus ───────────────────────────────── */
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.skip-link{
  position:fixed;top:-100px;left:20px;z-index:10000;
  background:var(--accent);color:#fff;padding:12px 20px;
  border-radius:8px;font-weight:600;transition:top .2s;
}
.skip-link:focus{top:12px}

/* ── Diagram Container ───────────────────── */
.diagram{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:40px 20px;overflow-x:auto;margin-bottom:40px}
.diagram svg{display:block;max-width:100%;height:auto}
.diagram text{fill:var(--text);font-family:system-ui,sans-serif}
.diagram line,.diagram path,.diagram rect{stroke:var(--border-light)}
.diagram .highlight{stroke:var(--accent);fill:var(--accent-dim)}

/* ── Responsive ──────────────────────────── */
@media(max-width:768px){
  .nav-links{display:none}
  section{padding:56px 0}
  .hero{min-height:70vh}
  .hero-inner{padding-top:96px}
  .hero-inner h1{font-size:2.8rem}
}
@media(max-width:480px){
  .hero{min-height:65vh}
  .hero-inner h1{font-size:2.2rem}
  .cap-grid,.services-grid,.contact-grid{grid-template-columns:1fr}
}


/* ── Recent work / freelancer positioning ───────── */
.hero-availability{margin:18px 0 0;color:var(--accent);font-size:.9rem;font-weight:600}
.featured-project{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-dim)}
.project-note{color:var(--muted)!important;font-size:.84rem!important}
.project-links{display:flex;gap:22px;flex-wrap:wrap}
.demo-hours{margin-top:18px!important;padding:10px 12px;border-left:2px solid var(--accent);background:var(--bg3);font-size:.8rem!important;color:var(--text2)!important}
.current-work .timeline-content{padding-bottom:4px}

/* Compact stack labels for public repository cards */
.repo-stack{font-size:.72rem!important;color:var(--muted)!important;font-family:'SF Mono','Fira Code','Consolas',monospace;margin-top:12px!important;line-height:1.55}

/* ── Freelancer services / AI positioning ─────── */
.service-link{display:inline-flex;align-items:center;gap:6px;margin-top:16px;font-size:.86rem;font-weight:600}
.knowledge-rationale-text{width:100%}
.knowledge-rationale-text p{max-width:none}
@media(max-width:768px){
  .footer-inner{grid-template-columns:1fr}
  .footer-contact{justify-content:flex-start}
}
/* ── Impressum ───────────────────────────── */
.impressum-page{padding-top:120px;min-height:calc(100vh - 180px)}
.back-link{display:inline-flex;align-items:center;gap:8px;color:var(--muted);margin-bottom:48px;font-size:.9rem}
.back-link:hover{color:var(--text)}
.impressum-heading{margin-bottom:48px}
.impressum-heading h1{font-size:clamp(2.8rem,6vw,4.5rem);margin-top:10px}
.impressum-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:clamp(28px,5vw,48px);max-width:1100px}
.impressum-card section{padding:0;margin:0 0 34px}
.impressum-card section:last-child{margin-bottom:0}
.impressum-card h2{font-size:1.35rem;padding-bottom:12px;margin-bottom:18px;border-bottom:1px solid var(--border)}
.impressum-card p{max-width:none}
.impressum-card strong{color:var(--text)}