/* ============ RESET / BASE ============ */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:#0f172a;
  background:#ffffff; /* body trắng, section alt sẽ xám */
  line-height:1.7;
}
a{color:inherit;text-decoration:none}
ul{padding-left:18px}
li{margin:10px 0}
/* HERO */
.hero{
  padding-top: 20px;   /* trước 34px -> đẩy xuống */
  padding-bottom: 18px;
  background:#fff;
}

:root{
  --container-w: 90%;

  /* giảm ngang còn ~1/2 */
  --gutter: 48px;
  --section-py: 80px;

  --ink:#0b1220;
  --muted:#6b7280;
  --card:#ffffff;
  --soft:#eef2f7;
  --soft-2:#e9eef7;
  --primary:#007893;

  /* project header dịu hơn, không đen gắt */
  --strip-dark:#234755;   /* trước: 0c1426 */
  --strip-light:#eef1f7;

  --yellow:#fdeaa0;
  --pink:#ffd1e5;
  --green:#d9f5e1;
  --blue:#d8e7ff;
  --neutral:#eef2f6;

  --chip-python:#ffeaa6;
  --chip-hadoop:#a7d4ff;
  --chip-spark:#a7d4ff;
  --chip-sql:#ffb3d9;

  --radius:18px;
  --shadow:0 10px 30px rgba(15,23,42,.08);
}
.container{
  width: min(100% - (var(--gutter) * 2), var(--container-w));
  margin-inline: auto;
}
.section{padding-block:var(--section-py); background:#fff;}
.alt{background:#f3f5f9;} /* xám nhạt, xen kẽ */
.center{text-align:center}
.muted{color:var(--muted)}
.mt-8{margin-top:8px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 30px;border-radius:12px;
  border:1px solid #dbe2ee;background:#fff;
  font-weight:600;font-size:15px;
  transition:.2s ease;
  box-shadow:0 4px 12px rgba(0,0,0,.03);
  gap:10px;
}
.btn:hover{transform:translateY(-1px)}
.btn.primary{
  background:var(--ink);color:#fff;border-color:transparent;
  box-shadow:0 8px 20px rgba(11,18,32,.2)
}
.btn.ghost{
  background:#f3f5f9;
  border:none;
  color:#0f172a;
  margin-top:14px;
  font-weight:500;
  padding:10px 20px;
  font-size:13px;
}

.btn.ghost:hover{
  background:#e9eef7;
}

.card{
  background:var(--card);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  border:1px solid #e7ecf4;
}
.lift{transition:.2s ease}
.lift:hover{transform:translateY(-2px)}

/* ============ NAV ============ */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.9);
  border-bottom:1px solid #e7ecf4;
  backdrop-filter: blur(8px);
}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 0;
  gap:12px;
}
.logo{font-weight:800;letter-spacing:.2px}
.nav{
  display:flex;gap:18px;flex-wrap:wrap;
  font-weight:600;font-size:14px;color:#111827;
}
.nav a{
  padding:6px 12px;
  border-bottom:2px solid transparent;
  position: relative;
  transition: color 0.3s ease;
}
.nav a::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background: rgba(91, 209, 255, 0.1);
  border-radius: 8px;
  transition: width 0.4s ease;
  z-index: -1;
}
.nav a:hover::before{
  width: 100%;
}
.nav a.active{color:var(--primary)}
.nav a.active::before{
  width: 100%;
  background: rgba(84, 189, 237, 0.1);
}
.lang-btn{
  padding:8px 12px;border-radius:999px;background:var(--ink);
  color:#fff;font-weight:700;font-size:12px;border:none;cursor:pointer;
}

/* ============ HERO ============ */
.hero{padding-top:200px;padding-bottom:200px;background:#fff}
.hero-single{display:grid;gap:24px}
.hero h1{
  font-size:clamp(36px,4.6vw,62px);line-height:1.08;font-weight:900;
}
.hero h1 span{
  color:var(--primary);display:block;margin-top:10px;
  font-size:clamp(40px,5.4vw,70px);
}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}
.hero-desc{
  max-width:950px;font-size:18px;line-height:1.75;color:#323a3c;margin-top:4px
}

/* ============ SECTION TITLES ============ */
h2{
  font-size: clamp(28px, 2.8vw, 44px);
  font-weight:900;margin-bottom:24px;line-height:1.2;
}

h2.center{
  text-align: center;
}

/* ============ EDUCATION ============ */
.edu-card{padding:32px 40px}
.edu-head{
  display:flex;align-items:flex-start;justify-content:space-between;gap:12px;
}
/* Education time pill -> nhẹ, không bold */
.tag-right{
  color:#334155;
  font-weight:600;
  font-size:12px;
  white-space:nowrap;
}

.edu-card h3{font-size:18px;font-weight:800}
.edu-card .muted{margin-top:6px}
.edu-note{margin-top:10px}

/* ============ TIMELINE ============ */
.timeline{
  position:relative;margin-top:8px;display:grid;gap:28px
}
.timeline::before{
  content:"";position:absolute;left:8px;top:0;bottom:0;width:2px;
  background:#d7deea;border-radius:2px;
}
.tl-item{position:relative;padding-left:32px}
.tl-dot{
  position:absolute;left:0;top:20px;width:14px;height:14px;border-radius:999px;
  background:#fff;border:3px solid var(--primary);
  box-shadow:0 0 0 4px #eaf0ff;
}
.tl-card{padding:32px 40px}
.tl-head{
  display:flex;justify-content:space-between;gap:12px;align-items:flex-start;
}
.tl-head h3{font-size:18px;font-weight:900}
.company{font-weight:700;color:#0084a9;margin-top:2px}
.tl-meta{
  display:flex;
  gap:16px;
  flex-wrap:wrap;
  font-size:12.5px;
  font-weight:500;    /* mảnh, không bold */
  color:#64748b;
}

.meta-inline{
  display:inline-flex;
  align-items:center;
  gap:6px;
  background:transparent;  /* bỏ pill */
  padding:0;
  border:0;
  border-radius:0;
}

.meta-inline .ico{
  font-size:13px;
  opacity:.8;
}

.ico-svg{
  color: inherit;
  opacity: .8;
}

.tl-overview{margin-top:8px}

/* ============ PROJECTS ============ */
.grid-2{
  display:grid;grid-template-columns:repeat(2,1fr);gap:28px;margin-top:12px;
}
.project-card{padding:0;overflow:hidden}
.project-strip{
  background:transparent;
  color:#64748b;
  padding:28px 32px 0 32px;
  font-size:12px;
  font-weight:600;
  border-bottom:none;
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:8px;
}

.project-year{
  background:transparent;
  color:#64748b;
  padding:0;
  border-radius:0;
  font-size:12px;
  font-weight:500;
}

.project-body{padding:0 32px 28px 32px}
.project-body h3{font-size:18px;font-weight:900;margin-bottom:8px}
.project-body p{margin:10px 0;font-size:14.5px;color:#111827}
.chips{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:10px}
.chip{
  font-size:12px;font-weight:900;padding:6px 10px;border-radius:999px;
  background:#eef2f7;color:#0f172a;border:1px solid #e5e9f2;
}
.chip.python{background:var(--chip-python)}
.chip.hadoop{background:var(--chip-hadoop);color:#0b1220}
.chip.spark{background:var(--chip-spark);color:#0b1220}
.chip.sql{background:var(--chip-sql)}
.chip.powerbi{background:var(--chip-python)}

.chips .btn{
  padding:6px 14px;
  font-size:12px;
  margin-top:0;
}

.project-footer{
  padding:0 32px 28px 32px;
  display:flex;
  justify-content:flex-end;
}

.btn-text{
  padding:8px 16px;
  border-radius:8px;
  background:#f3f5f9;
  color:#0f172a;
  font-weight:500;
  font-size:12px;
  transition:.2s ease;
  display:inline-flex;
  align-items:center;
}

.btn-text:hover{
  background:#e9eef7;
  transform:translateY(-1px);
}

.btn-text{
  padding:8px 16px;
  border-radius:8px;
  background:#f3f5f9;
  color:#0f172a;
  font-weight:500;
  font-size:12px;
  transition:.2s ease;
  display:inline-flex;
  align-items:center;
}

.btn-text:hover{
  background:#e9eef7;
  transform:translateY(-1px);
}

/* ============ SKILLS ============ */
.skills-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:28px;margin-top:10px;
}
.skills-grid.bottom{
  grid-template-columns:repeat(3,1fr);
  margin-top:16px;
}
.skill-card{overflow:hidden}
.skill-head{
  font-weight:900;font-size:14px;padding:10px 14px;color:#0b1220;
  width:100%;
}
.skill-head.yellow{background:var(--yellow)}
.skill-head.pink{background:var(--pink)}
.skill-head.green{background:var(--green)}
.skill-head.blue{background:var(--blue)}
.skill-head.neutral{background:var(--neutral)}
.skill-body{padding:24px 28px;font-size:14px}

/* ============ AWARDS ============ */
.award-card{
  padding: 32px 40px;
}.award-head{
  display:flex;justify-content:space-between;gap:12px;align-items:flex-start;
  margin-bottom:8px;
}
.award-head h3{font-size:18px;font-weight:900}
.award-card ul{margin-top:6px}
.award-chips{justify-content:flex-end}

/* ============ CONTACT ============ */
.contact-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:10px;
}
.contact-card{
  display:flex;align-items:center;gap:14px;padding:28px 32px;
  border-radius:16px;background:#fff;border:1px solid #e7ecf4;
  box-shadow:var(--shadow);
  transition:.2s ease;
}
.contact-card:hover{transform:translateY(-2px)}
.contact-icon{
  width:44px;height:44px;border-radius:12px;
  background:var(--ink);display:grid;place-items:center;flex:0 0 auto;
}
.contact-label{font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.6px;color:#64748b}
.contact-value{font-size:15px;font-weight:900;color:#0b1220;margin-top:2px}

/* ============ REVEAL ============ */
.reveal{opacity:0;transform:translateY(12px);transition:.6s ease}
.reveal.in{opacity:1;transform:none}

/* ============ RESPONSIVE ============ */
@media (max-width: 980px){
  .grid-2{grid-template-columns:1fr}
  .skills-grid{grid-template-columns:repeat(2,1fr)}
  .skills-grid.bottom{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .timeline::before{left:6px}
}
@media (max-width: 640px){
  :root{--gutter:8px;--section-py:46px} /* giảm gutter mobile */
  .nav{gap:10px;font-size:13px}
  .hero-desc{max-width:100%}
  .skills-grid{grid-template-columns:1fr}
}