/* Màu sắc */
:root{--bg:#0e0f12;--panel:#14161b;--text:#d9dde7;--muted:#9aa3b2;--brand:#00ff88;--brand-2:#11cc77;--ring:rgba(0,255,136,.3)}
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:'Space Mono',ui-monospace,monospace}
a{color:var(--text);text-decoration:none}
.container{width:min(1100px,90%);margin-inline:auto}
.section{padding:80px 0}.section-title{font-size:32px;margin:0 0 24px}.muted{color:var(--muted)}

/* Header */
.site-header{position:sticky;top:0;z-index:40;backdrop-filter:blur(6px);background:linear-gradient(to bottom,rgba(14,15,18,.9),rgba(14,15,18,.6));border-bottom:1px solid #1b1f27}
.nav{display:flex;align-items:center;gap:20px;padding:16px 0}
.logo{font-weight:700;font-size:22px}.logo .dot{color:var(--brand)}
#nav{display:flex;gap:18px;margin-left:auto}#nav a:hover{color:var(--brand)}
.cta{background:var(--brand);color:#0a0a0a;padding:10px 16px;border-radius:999px;font-weight:700}
#burger{display:none;margin-left:6px;background:none;border:0;cursor:pointer}#burger span{display:block;width:22px;height:2px;background:var(--text);margin:5px 0}

/* Hero */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;min-height:70dvh;padding:60px 0}
.eyebrow{color:var(--muted);margin:0 0 8px}
.hero h1{font-size:56px;line-height:1.05;margin:0 0 12px}.hero h1 .accent{color:var(--brand)}
.lead{color:#b7c0cf;margin:0 0 18px;max-width:55ch}
.cta-row{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:10px;border:1px solid #2b2f39}
.btn.primary{background:var(--brand);color:#0b0d10;border-color:transparent;font-weight:700}
.socials a{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:50%;border:1px solid #2a2f38}.socials a:hover{border-color:var(--brand);color:var(--brand)}
.stats{list-style:none;padding:0;margin:26px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:10px;max-width:560px}
.stats .num{display:block;font-size:30px;color:var(--brand)}
.hero-art{position:relative;display:grid;place-items:center}
.hero-art .ring{position:absolute;width:430px;height:430px;border:3px dashed var(--brand);border-radius:50%;filter:drop-shadow(0 0 40px var(--ring));animation:spin 18s linear infinite}
.hero-art img{width:min(90%,440px);max-width:100%;border-radius:16px;outline:none;border:none;box-shadow:none}
@keyframes spin{to{transform:rotate(1turn)}}

/* Cards & timeline */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--panel);padding:22px;border:1px solid #232834;border-radius:16px}
.card i{color:var(--brand);font-size:22px;margin-bottom:8px}
.timeline{border-left:2px dashed var(--brand);padding-left:18px;display:grid;gap:18px}
.tl-item{background:var(--panel);border:1px solid #232834;border-radius:16px;padding:16px 18px}
.tl-item .when{color:var(--brand-2);font-weight:700}

/* Repo cards */
.repo-card{border:1px solid #262a34;border-radius:16px;padding:0;background:var(--panel)}
.repo{padding:16px}
.repo-head{display:flex;gap:8px;align-items:center;margin-bottom:6px}
.repo-meta{display:flex;gap:12px;color:var(--muted);font-size:12px;margin-top:8px}

/* Contact */
.contact{background:radial-gradient(80% 100% at 100% 0, rgba(0,255,136,.08), transparent), var(--bg)}
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.contact-copy p{color:#b7c0cf;max-width:55ch}
.contact-list{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:8px}
.contact-list i{color:var(--brand);width:18px;margin-right:8px}
.contact-form{background:var(--panel);border:1px solid #232834;border-radius:16px;padding:18px;display:grid;gap:12px}
.contact-form label{display:grid;gap:8px;font-size:14px;color:#c5cedd}
.contact-form input,.contact-form textarea{background:#0b0d11;border:1px solid #222834;border-radius:10px;padding:12px 14px;color:var(--text)}
.contact-form input:focus,.contact-form textarea:focus{outline:1px solid var(--brand)}
.form-note{color:var(--muted);font-size:12px}

/* Footer */
.site-footer{border-top:1px solid #1b1f27;padding:32px 0;color:#9aa3b2}

/* Responsive unify mobile look */
@media (max-width: 960px){
  .hero{grid-template-columns:1fr}
  .contact-wrap{grid-template-columns:1fr}
}
@media (max-width: 760px){
  .hero{grid-template-columns:1fr; padding:28px 0 10px}
  .hero h1{font-size:42px;margin-bottom:8px}
  .lead{font-size:14px}
  .hero-art .ring{width:320px;height:320px}
  .stats{grid-template-columns:repeat(4,1fr);gap:8px;margin-top:18px}
  .cta-row{gap:12px}
  #nav{display:none;position:absolute;right:5%;top:64px;background:var(--panel);border:1px solid #232834;border-radius:12px;padding:12px;flex-direction:column}
  #nav.show{display:flex}
  #burger{display:block}
  .grid3{grid-template-columns:1fr}
}

/* === Mobile hero = image first, centered (match mẫu gốc) === */
@media (max-width: 760px){
  .hero{grid-template-columns:1fr; padding:24px 0 0}
  .hero-copy{order:2;text-align:center}
  .hero-copy .eyebrow{justify-self:center}
  .hero-art{order:1;margin-bottom:10px;display:grid;place-items:center}
  .hero-art .ring{width:280px;height:280px}
  .hero-art img{width:min(86%,340px)}
  .cta-row{justify-content:center}
  .stats{margin-top:22px;grid-template-columns:repeat(4,1fr);gap:8px}
}


/* Force hamburger to the far right on small screens */
@media (max-width: 960px){
  .nav{justify-content:space-between}
  #burger{display:block}
}

.site-footer .container{ text-align:center; }