/* Base variables */
:root{
  --bg: #0b1220;
  --surface: #0f172a;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #0ea5e9;
  --primary-600:#0284c7;
  --ring:#22d3ee;
  --card:#111827;
  --border:#1f2937;
  --shadow: 0 6px 18px rgba(0,0,0,.25);
  --glass-bg: color-mix(in srgb, var(--surface) 75%, transparent);
  --glass-border: color-mix(in srgb, var(--text) 10%, transparent);
  --gradient: radial-gradient(1200px 600px at 10% -20%, rgba(14,165,233,.25), transparent 60%),
              radial-gradient(800px 400px at 110% 10%, rgba(34,211,238,.15), transparent 60%),
              linear-gradient(180deg, transparent, transparent 60%, rgba(0,0,0,.15));
}
@media (prefers-color-scheme: light){
  :root{
    --bg:#f8fafc; --surface:#ffffff; --text:#111827; --muted:#4b5563; --card:#ffffff; --border:#e5e7eb; --shadow: 0 6px 18px rgba(0,0,0,.08);
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif}
img{max-width:100%;height:auto;border-radius:12px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin-inline:auto;padding:0 1rem}
.section{padding:4rem 0; scroll-margin-top:80px}
.section.alt{background:var(--surface)}
.lead{font-size:1.125rem;color:var(--muted)}
.btn{display:inline-block;background:var(--primary);color:#fff;padding:.75rem 1rem;border-radius:10px;font-weight:600;border:1px solid transparent;box-shadow:0 10px 20px rgba(14,165,233,.15);transform:translateY(0);transition:transform .2s ease, box-shadow .2s ease, background .2s ease}
.btn:hover{background:var(--primary-600);text-decoration:none;transform:translateY(-2px);box-shadow:0 14px 24px rgba(14,165,233,.25)}
.btn-secondary{background:transparent;border:1px solid var(--border);color:var(--text)}

/* Header/Nav */
.header{position:sticky;top:0;z-index:50;backdrop-filter:saturate(1.2) blur(8px);background:color-mix(in srgb, var(--bg) 70%, transparent);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:.75rem 0}
.nav-container{position:relative}
.logo{display:flex;gap:.5rem;align-items:center;color:var(--text);font-weight:800}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;color:var(--text);padding:.25rem .5rem;cursor:pointer}
.nav ul{display:flex;gap:1rem;list-style:none;padding:0;margin:0}
.nav-link{position:relative;color:var(--text)}
.nav-link::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--primary);transition:width .25s ease}
.nav-link:hover::after{width:100%}
.lang-switch{margin-left:1rem;display:flex;gap:.25rem}
.lang-switch button{background:transparent;border:1px solid var(--border);color:var(--text);padding:.4rem .6rem;border-radius:8px;cursor:pointer}
.lang-switch .active{background:var(--surface)}
.theme-toggle{margin-left:.5rem;background:transparent;border:1px solid var(--border);color:var(--text);padding:.4rem .6rem;border-radius:8px;cursor:pointer}

/* Hero */
.hero{position:relative;background:var(--gradient)}
.grid-2{display:grid;grid-template-columns:1.1fr .9fr;gap:2rem;align-items:center}
.hero-card{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:16px;backdrop-filter:blur(10px);padding:1.5rem;box-shadow:var(--shadow)}
.hero-title{font-size:clamp(1.75rem, 4vw + .5rem, 3rem);line-height:1.2;margin:0 0 .5rem}
.typing{color:var(--primary)}
.hero-actions{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1rem}
.hero-media{display:flex;align-items:center;justify-content:center}
.hero-media img{box-shadow:var(--shadow);transform:perspective(800px) rotateY(0) translateZ(0);transition:transform .35s ease;max-width:320px;width:100%;height:auto}
.hero-media:hover img{transform:perspective(800px) rotateY(-8deg) translateZ(10px)}

/* Cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.25rem}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;overflow:hidden;box-shadow:var(--shadow);transform:translateY(0) scale(1);transition:transform .25s ease, box-shadow .25s ease}
.card img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
.card:hover{transform:translateY(-6px) scale(1.01);box-shadow:0 18px 40px rgba(0,0,0,.25)}
.card-body{padding:1rem}
.card .links{display:flex;gap:1rem}

/* Skills */
.skill-tags{display:flex;flex-wrap:wrap;gap:.5rem;list-style:none;padding:0}
.skill-tags li{background:var(--surface);border:1px solid var(--border);padding:.4rem .6rem;border-radius:999px}

/* Timeline */
.timeline{list-style:none;padding:0;margin:0;border-left:2px solid var(--border)}
.timeline li{position:relative;padding-left:1rem;margin-left:.5rem}
.timeline .dot{position:absolute;left:-7px;top:.4rem;width:10px;height:10px;background:var(--primary);border-radius:50%}

/* Forms */
.contact-container{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;align-items:start}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
label{display:flex;flex-direction:column;gap:.5rem}
input,textarea{background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:.75rem}
input:focus,textarea:focus{outline:none;border-color:var(--ring);box-shadow:0 0 0 3px color-mix(in srgb, var(--ring) 35%, transparent)}
#form-status{margin-top:.75rem;color:var(--muted)}

/* Footer */
.footer{border-top:1px solid var(--border);padding:2rem 0;color:var(--muted)}
.footer .social{display:flex;gap:.75rem}
.social-links{display:flex;gap:.75rem;flex-wrap:wrap}
.social-link{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--border);border-radius:10px;color:var(--text);transition:transform .2s ease, background .2s ease}
.social-link:hover{transform:translateY(-2px);background:var(--surface)}

/* Accessibility */
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:1rem;top:1rem;width:auto;height:auto;background:#fff;color:#000;padding:.5rem;border-radius:8px}
:focus-visible{outline:3px solid var(--ring);outline-offset:2px}

/* Utilities */
.alt-contacts{margin-top:1rem;display:flex;gap:1rem;flex-wrap:wrap}
.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s ease, transform .6s ease}
.reveal.reveal-visible{opacity:1;transform:translateY(0)}

/* Responsive */
@media (max-width: 900px){
  .grid-2{grid-template-columns:1fr}
  .contact-container{grid-template-columns:1fr}
  .hero-card{text-align:center}
}
@media (max-width: 720px){
  .nav-toggle{display:inline-block}
  .nav ul{display:none;position:absolute;left:1rem;right:1rem;top:calc(100% + .5rem);background:var(--surface);border:1px solid var(--border);padding:1rem;border-radius:12px;flex-direction:column;box-shadow:var(--shadow)}
  .nav ul.open{display:flex}
  .form-grid{grid-template-columns:1fr}
  .hero-title{font-size:clamp(1.5rem, 6vw + .5rem, 2.25rem)}
  .section{padding:3rem 0}
}

@media (max-width: 480px){
  .container{padding:0 .875rem}
  .btn{width:100%;text-align:center}
  .hero-actions{display:grid;gap:.75rem;grid-template-columns:1fr}
}

/* Theme override via [data-theme] attribute */
[data-theme="light"]{
  --bg:#f8fafc; --surface:#ffffff; --text:#111827; --muted:#4b5563; --card:#ffffff; --border:#e5e7eb; --shadow: 0 6px 18px rgba(0,0,0,.08);
}
[data-theme="dark"]{
  --bg: #0b1220; --surface:#0f172a; --text:#e5e7eb; --muted:#9ca3af; --card:#111827; --border:#1f2937; --shadow: 0 6px 18px rgba(0,0,0,.25);
}