:root{
    --primary:#2563eb; --primary-dark:#1d4ed8; --text:#1f2937; --muted:#6b7280;
    --bg:#ffffff; --bg-alt:#f3f6fb; --border:#e5e7eb; --radius:14px;
    --shadow:0 4px 16px rgba(15,23,42,.07);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',Roboto,Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.65}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
.container{width:min(1100px,92%);margin:0 auto}
h1,h2,h3{line-height:1.25}
.muted{color:var(--muted)}

/* Header & Nav */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.navbar{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{font-size:1.4rem;font-weight:700}
.brand span{color:var(--primary)}
.nav-links{display:flex;gap:6px}
.nav-links a{padding:8px 14px;border-radius:8px;font-weight:500;transition:.2s}
.nav-links a:hover,.nav-links a.active{background:var(--primary);color:#fff}
.menu-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;font-size:1.4rem;padding:4px 12px;cursor:pointer}

/* Buttons */
.btn{display:inline-block;padding:11px 26px;border-radius:10px;font-weight:600;border:2px solid var(--primary);cursor:pointer;font-size:1rem;transition:.25s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);transform:translateY(-2px)}
.btn-outline{background:transparent;color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}
.btn-sm{padding:7px 18px;font-size:.9rem}
.btn-group{display:flex;gap:14px;flex-wrap:wrap;margin-top:24px}

/* Hero */
.hero{background:linear-gradient(135deg,#eef4ff,#fff);padding:80px 0}
.hero-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center}
.eyebrow{color:var(--primary);font-weight:600}
.hero h1{font-size:3rem;margin:6px 0 14px}
.lead{font-size:1.1rem;color:var(--muted);max-width:520px}
.hero-photo img,.about-photo img{width:100%;max-width:340px;aspect-ratio:1;object-fit:cover;border-radius:50%;border:6px solid #fff;box-shadow:var(--shadow);margin:0 auto}

/* Sections */
.section{padding:70px 0}
.section.alt{background:var(--bg-alt)}
.section-title{text-align:center;margin-bottom:32px;font-size:1.8rem}
.page-banner{background:var(--bg-alt);text-align:center;padding:50px 0}
.page-banner h1{font-size:2.2rem}
.page-banner p{color:var(--muted)}

/* Grid & Card */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:.25s}
.card:hover{transform:translateY(-5px);box-shadow:0 10px 24px rgba(15,23,42,.12)}
.card h3{margin-bottom:8px}
.link-card{display:block}

/* About */
.about-grid{display:grid;grid-template-columns:1fr 1.5fr;gap:44px;align-items:center}
.about-grid h2{margin-bottom:12px}
.about-grid h3{margin:22px 0 8px}
.bio-table{border-collapse:collapse;width:100%}
.bio-table th,.bio-table td{text-align:left;padding:9px 6px;border-bottom:1px solid var(--border)}
.bio-table th{width:110px;color:var(--muted);font-weight:600}

/* Timeline */
.timeline{position:relative;max-width:720px;margin:0 auto;padding-left:30px;border-left:3px solid var(--primary)}
.timeline-item{position:relative;margin-bottom:24px}
.timeline-item::before{content:"";position:absolute;left:-40px;top:30px;width:16px;height:16px;background:var(--primary);border:3px solid #fff;border-radius:50%}
.badge{display:inline-block;background:var(--bg-alt);color:var(--primary);font-weight:600;font-size:.85rem;padding:3px 12px;border-radius:20px;margin-bottom:8px}

/* Skills */
.skill-card{text-align:center}
.icon{width:58px;height:58px;margin:0 auto 14px;display:grid;place-items:center;background:var(--bg-alt);color:var(--primary);font-weight:700;border-radius:14px}

/* Portfolio */
.project-card{display:flex;flex-direction:column;gap:10px}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 10px}
.tag{background:var(--bg-alt);color:var(--primary);font-size:.8rem;font-weight:600;padding:3px 12px;border-radius:20px}
.project-card .btn{align-self:flex-start;margin-top:auto}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.6fr;gap:24px;align-items:start}
.contact-grid p{margin-top:12px}
form label{display:block;font-weight:600;margin:14px 0 6px}
form input,form textarea{width:100%;padding:11px 14px;border:1px solid var(--border);border-radius:10px;font:inherit}
form input:focus,form textarea:focus{outline:2px solid var(--primary);border-color:transparent}
form .btn{margin-top:18px}
.alert{padding:14px 18px;border-radius:10px;margin-bottom:16px}
.alert.success{background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0}
.alert.error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.alert ul{padding-left:18px;list-style:disc}
.result p{margin-top:8px}

/* Footer */
.site-footer{background:#111827;color:#d1d5db;text-align:center;padding:24px 0;font-size:.9rem}

/* Responsive */
@media (max-width:900px){
    .grid-3{grid-template-columns:repeat(2,1fr)}
    .hero h1{font-size:2.4rem}
}
@media (max-width:700px){
    .menu-toggle{display:block}
    .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:10px 4%;border-bottom:1px solid var(--border)}
    .nav-links.open{display:flex}
    .hero{padding:50px 0}
    .hero-grid,.about-grid,.contact-grid,.grid-2,.grid-3{grid-template-columns:1fr}
    .hero-photo{order:-1}
    .hero-photo img{max-width:220px}
    .hero-text{text-align:center}
    .lead{margin:0 auto}
    .btn-group{justify-content:center}
    .section{padding:48px 0}
}