:root {
  --bg-main: #0D1117;
  --bg-card: #161B22;
  --green: #3FB950;
  --green-dark: #2EA043;
  --text-main: #C9D1D9;
  --text-muted: #8B949E;
}

/* ===== Reset & Base ===== */
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family:system-ui,sans-serif; background:var(--bg-main); color:var(--text-main); line-height:1.6; overflow-x:hidden; }
a, button { transition:all 0.25s ease; }

/* ===== Buttons ===== */
.btn { display:inline-block; margin-top:1rem; padding:0.75rem 1.5rem; background:linear-gradient(135deg,var(--green),var(--green-dark)); color:#000; text-decoration:none; border-radius:6px; font-weight:600; }
.btn:hover { transform:translateY(-2px); filter:brightness(1.1); }
.btn-outline { background:transparent; color:var(--green); border:1px solid var(--green); }
.btn-outline:hover { background:var(--green); color:#000; }

/* ===== Container & Sections ===== */
.container { max-width:1100px; margin:auto; padding:1.5rem; }
.section { padding:4rem 0; position:relative; }
.section::before { content:""; position:absolute; top:0; left:50%; width:60px; height:3px; background:linear-gradient(135deg,var(--green),var(--green-dark)); transform:translateX(-50%); }
h3 { margin-bottom:1rem; }

/* ===== Header ===== */
.header { position:sticky; top:0; z-index:100; background:rgba(13,17,23,0.9); backdrop-filter:blur(10px); }
.nav { display:flex; justify-content:space-between; align-items:center; }
nav a { margin-left:1.5rem; color:var(--text-muted); text-decoration:none; }
nav a:hover { color:var(--green); }
#menu-btn { display:none; font-size:1.5rem; background:none; color:var(--text-main); border:none; cursor:pointer; }

/* ===== Hero ===== */
.hero { min-height:90vh; display:flex; align-items:center; position:relative; overflow:hidden; }
#hero-canvas { position:absolute; inset:0; z-index:0; }
.hero-content { max-width:700px; position:relative; z-index:1; }
.hero-title { font-size:clamp(2.5rem,5vw,4rem); font-weight:700; letter-spacing:-1px; }
.hero-subtitle { margin-top:0.5rem; color:var(--green); font-weight:500; }
.hero-desc { margin-top:1rem; color:var(--text-muted); max-width:600px; }
.hero-actions { margin-top:2rem; display:flex; gap:1rem; }

/* ===== About ===== */
.about-grid { display:grid; grid-template-columns:2fr 1fr; gap:2.5rem; }
.about-text { margin-top:1rem; }
.about-highlight { background:var(--bg-card); border-radius:12px; padding:2rem; position:relative; }
.about-highlight li { margin-bottom:1rem; color:var(--text-muted); padding-left:1.5rem; position:relative; }
.about-highlight li::before { content:"▹"; position:absolute; left:0; top:0; color:var(--green); }
@media(max-width:768px){ .about-grid{grid-template-columns:1fr;} }

/* ===== Projects ===== */
.projects-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:2rem; margin-top:2rem; }
.project-card { background:var(--bg-card); border-radius:14px; padding:2rem; position:relative; transition:transform 0.25s, box-shadow 0.25s; }
.project-card::before { content:""; position:absolute; inset:0; border-radius:14px; border:1px solid transparent; background:linear-gradient(135deg,var(--green),transparent 40%); opacity:0.2; pointer-events:none; }
.project-card:hover { transform:translateY(-6px); box-shadow:0 12px 35px rgba(0,0,0,0.45); }
.project-card h4 { margin-bottom:0.5rem; font-size:1.2rem; }
.project-desc { color:var(--text-muted); margin-bottom:1rem; }
.project-tech { font-size:0.9rem; color:var(--green); }
.project-card .btn { margin-top:1rem; }

/* ===== Skills ===== */
.skills-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:2rem; margin-top:2rem; }
.skill-card { background:var(--bg-card); border-radius:14px; padding:2rem; transition:transform 0.25s, box-shadow 0.25s; position:relative; }
.skill-card:hover { transform:translateY(-6px); box-shadow:0 12px 35px rgba(0,0,0,0.45); }
.skill-card li { margin-bottom:0.6rem; color:var(--text-muted); padding-left:1.5rem; position:relative; }
.skill-card li::before { content:"▹"; position:absolute; left:0; top:0; color:var(--green); }

/* ===== Contact ===== */
.contact-grid { text-align:center; max-width:700px; margin:auto; }
.contact-text { margin-top:1rem; color:var(--text-muted); }
.contact-links { margin-top:2rem; display:flex; flex-wrap:wrap; justify-content:center; gap:1rem; }

/* ===== Footer ===== */
.footer { text-align:center; padding:2rem; color:var(--text-muted); }

/* ===== Fade-in ===== */
.fade-in { opacity:0; transform:translateY(20px); transition:opacity 0.6s, transform 0.6s; }
.fade-in.show { opacity:1; transform:translateY(0); }

/* ===== Scroll to Top Button ===== */
#scroll-top-btn { position:fixed; bottom:2rem; right:2rem; width:45px; height:45px; border:none; border-radius:50%; background:var(--green); color:#000; font-size:1.5rem; cursor:pointer; display:none; z-index:1000; box-shadow:0 4px 10px rgba(0,0,0,0.3); }
#scroll-top-btn:hover { filter:brightness(1.1); }

/* ===== Mobile ===== */
@media(max-width:768px){ nav{display:none;flex-direction:column;background:var(--bg-card);position:absolute;right:1rem;top:60px;padding:1rem;border-radius:8px;} nav.show{display:flex;} #menu-btn{display:block;} }