/* ---------- base ---------- */
:root{
  --bg:#0b1220;
  --card:#07121a;
  --muted:#9fb6c6;
  --accent:#18a0d6;
  --accent-2:#1fb6ff;
  --glass: rgba(255,255,255,0.03);
  --radius:14px;
  --max-width:1150px;
  --fw-normal:400;
  --fw-strong:700;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: var(--bg);
  color:#cee7f3;
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
  scroll-behavior: smooth; /* 🔹 Cuộn mượt toàn trang */
}

/* ---------- container ---------- */
.container{
  width:90%;
  max-width:var(--max-width);
  margin:0 auto;
  padding:28px 0;
}

/* ---------- navbar & hero ---------- */
.site-header{padding-bottom:20px}
.navbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:20px 6%;
  max-width:100%;
  position:sticky;top:0;z-index:99;
  backdrop-filter:blur(10px); /* 🔹 Hiệu ứng kính mờ navbar khi cuộn */
  background:rgba(11,18,32,0.6);
  transition:all 0.4s ease;
}
.navbar:hover{background:rgba(11,18,32,0.9);} /* 🔹 Hover navbar đổi nhẹ màu nền */

.brand{display:flex;align-items:center;gap:10px}
.logo-dot{
  width:14px;height:14px;border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 6px 18px rgba(24,160,214,0.18);
  animation:pulse 2s infinite ease-in-out; /* 🔹 Hiệu ứng chớp sáng logo-dot */
}
@keyframes pulse{
  0%,100%{transform:scale(1);opacity:1}
  50%{transform:scale(1.3);opacity:.7}
}

.brand-text{font-weight:700;letter-spacing:0.6px}
.nav-links{display:flex;gap:18px;align-items:center;list-style:none;margin:0;padding:0}
.nav-links a{
  color:var(--muted);
  text-decoration:none;padding:8px 12px;border-radius:8px;
  font-weight:600;font-size:14px;
  transition:color .3s, background .3s;
}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,0.05)}


/* ---------- hero ---------- */
.hero{
  display:grid;
  grid-template-columns:1fr 420px;
  align-items:center;
  gap:28px;
  padding:36px 6%;
}
.hero-left{max-width:700px;animation:fadeUp 1s ease both;}
.hello{color:var(--muted);margin:0 0 6px;font-weight:500;animation:fadeUp .9s ease both .2s;}
.name{font-size:44px;margin:0;font-weight:800;letter-spacing:-1px;animation:fadeUp 1s ease both .3s;}
.role{color:var(--accent);margin:6px 0 14px;font-weight:700;animation:fadeUp 1s ease both .4s;}
.intro{color:var(--muted);margin-bottom:16px;animation:fadeUp 1s ease both .5s;}
.hero-cta{display:flex;gap:12px;margin-bottom:18px;animation:fadeUp 1s ease both .6s;}

.btn{
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  color:#021018;padding:10px 16px;border-radius:12px;text-decoration:none;font-weight:700;
  box-shadow:0 8px 28px rgba(31,182,255,0.08);
  transition:transform .25s ease, box-shadow .25s ease;
}
.btn:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(31,182,255,0.25)}
.btn-outline{
  background:transparent;border:1px solid rgba(255,255,255,0.06);color:var(--muted);
}
.btn-outline:hover{background:rgba(255,255,255,0.05);color:#fff}

.stats{display:flex;gap:18px;margin-top:12px;animation:fadeUp 1s ease both .7s;}
.stats div{
  background:var(--glass);padding:10px 14px;border-radius:10px;text-align:center;
  transition:transform .3s ease, box-shadow .3s ease;
}
.stats div:hover{transform:translateY(-5px) scale(1.05);box-shadow:0 6px 22px rgba(31,182,255,0.25);}
.stats strong{display:block;font-size:18px;color:#fff}

/* hero right image */
.hero-photo-wrap{
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.03));
  border-radius:20px;padding:22px;backdrop-filter:blur(6px);
  transition:transform .45s cubic-bezier(.2,.8,.2,1), box-shadow .45s;
  animation:fadeUp 1s ease both .8s;
}
.hero-photo-wrap:hover{transform:translateY(-8px) rotate(-0.6deg);box-shadow:0 18px 60px rgba(0,0,0,0.5)}
.hero-photo{width:320px;height:420px;object-fit:cover;border-radius:12px;display:block;box-shadow:0 10px 40px rgba(0,0,0,0.6)}

/* ---------- sections ---------- */
.section{padding:36px 0;animation:fadeUp .9s ease both;}
h2{font-size:22px;margin:0 0 12px}
.section-desc{color:var(--muted);margin-bottom:18px}

/* grid helper */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}

/* cards */
.card{
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:var(--radius);padding:20px;border:1px solid rgba(255,255,255,0.03);
  transition:transform .3s ease, box-shadow .3s ease;
}
.card:hover{transform:translateY(-6px);box-shadow:0 10px 40px rgba(31,182,255,0.15);}

/* about - photos */
.personal-photos{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap;}
.personal-photos img{
  width:100%;max-width:120px;height:90px;object-fit:cover;border-radius:10px;
  border:1px solid rgba(255,255,255,0.03);transition:transform .3s ease, filter .3s;
}
.personal-photos img:hover{transform:scale(1.06);filter:brightness(1.2);}
.personal-photos {
  position: relative;
  overflow: visible;
}

.personal-photos img:hover {
  position: relative;
  z-index: 10;
  transform: scale(2.2);
  box-shadow: 0 8px 25px rgba(31,182,255,0.25);
  filter: brightness(1.2);
  transition: transform .3s ease, filter .3s, box-shadow .3s ease;
}

/* skill bars */
.skill-bars{margin-top:12px}
.skill{margin-bottom:12px}
.skill-info{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}
.bar{
  height:10px;
  background:rgba(255,255,255,0.03);
  border-radius:999px;
  overflow:hidden;
  margin-top:6px;
}
.bar-fill{
  height:100%;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  border-radius:999px;
  transform-origin:left;
  animation:fillAnim 1s ease forwards; /* chạy tới giá trị --target-width */
  --target-width: 0%;
}
@keyframes fillAnim{
  from{width:0}
  to{width:var(--target-width,90%)}
}

/* projects grid */
.projects-grid {
  display: flex;
  justify-content: center;
  align-items: stretch; /* ép các thẻ cao bằng nhau */
  gap: 30px;
  flex-wrap: wrap; /* Tự xuống hàng khi màn hình nhỏ */
}

/* --- Card dự án --- */
.proj-card {
  flex: 1 1 300px;
  max-width: 380px;
  background: #0d1523;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  transition: all 0.4s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between; /* 🔹 giúp body giãn đều */
}

/* --- Ảnh dự án --- */
.proj-thumb {
  background-size: cover;
  background-position: center;
  height: 220px;
  flex-shrink: 0;
  transition: all 0.4s ease;
}

/* --- Phần nội dung dự án --- */
.proj-body {
  padding: 20px;
  flex-grow: 1; /* 🔹 bắt phần này chiếm đều chiều cao */
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* --- Hiệu ứng hover ánh sáng xanh --- */
.proj-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 0 25px rgba(0, 180, 255, 0.4);
  border: 1px solid rgba(0, 180, 255, 0.3);
}

.proj-card:hover .proj-thumb {
  transform: scale(1.05);
  filter: brightness(1.1);
}

/* --- Hiệu ứng mượt tổng thể --- */
.proj-card, .proj-thumb {
  transition: all 0.4s ease;
}

/* --- Bảo đảm cùng chiều cao giữa các card --- */
.proj-card {
  height: 100%;
  min-height: 450px; 
}
  

/* certs */
.cert-item{
  flex:1 1 280px;padding:14px;border-radius:10px;
  background:rgba(255,255,255,0.02);
  border:1px solid rgba(255,255,255,0.02);
  transition:transform .3s ease, box-shadow .3s ease;
}
.cert-item:hover{transform:translateY(-5px);box-shadow:0 8px 30px rgba(31,182,255,0.15);}
.cert-item img {
  width: 160px; /* ✅ Giảm kích thước ảnh */
  height: auto;
  margin: 0 auto 10px;
  display: block;
}
/* contact form */
.contact-list a{color:var(--accent);transition:color .3s;}
.contact-list a:hover{color:var(--accent-2);}
.contact-form label{display:block;margin-bottom:10px}
.contact-form input, .contact-form textarea{
  width:100%;padding:10px;border-radius:10px;
  border:1px solid rgba(255,255,255,0.04);
  background:transparent;color:var(--muted);
  transition:border .3s ease, box-shadow .3s ease;
}
.contact-form input:focus, .contact-form textarea:focus{
  border:1px solid var(--accent);box-shadow:0 0 10px rgba(31,182,255,0.2);
}
.contact-form .btn{width:100%;margin-top:8px}

/* footer */
.site-footer{
  padding:22px 0;border-top:1px solid rgba(255,255,255,0.02);
  animation:fadeUp .8s ease both;
}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:12px}
.socials a{
  margin-left:8px;color:var(--muted);text-decoration:none;
  transition:transform .3s ease, color .3s;
}
.socials a:hover{color:var(--accent-2);transform:translateY(-3px)}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .projects-grid{grid-template-columns:repeat(2,1fr)}
  .hero{grid-template-columns:1fr 320px}
  .hero-photo{width:260px;height:350px}
}
@media (max-width:720px){
  .nav-links{display:none}
  .hero{grid-template-columns:1fr; padding:18px 6%}
  .hero-right{order:-1;display:flex;justify-content:center;margin-bottom:18px}
  .grid-2{grid-template-columns:1fr}
  .projects-grid{grid-template-columns:1fr}
  .hero-photo{width:220px;height:300px}
  .footer-inner{flex-direction:column;align-items:flex-start;gap:6px}
}

/* ---------- keyframes ---------- */
@keyframes fadeUp {
  from { opacity:0; transform:translateY(20px); }
  to { opacity:1; transform:none; }
}
/* ---------- Hiệu ứng nền động ---------- */
/* Nền tối với các điểm sáng mờ */
body {
  background-color: #020617;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(31,182,255,0.08), transparent 60%),
    radial-gradient(circle at 80% 80%, rgba(31,182,255,0.06), transparent 60%);
  background-attachment: fixed;
  color: #e0e0e0;
}
/* Hiệu ứng chuyển động nền */
@keyframes moveGlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
body {
  animation: moveGlow 20s ease-in-out infinite;
  background-size: 200% 200%;
}
/*Ánh sáng trôi nhẹ toàn trang */
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  background: radial-gradient(circle at var(--x, 40%) var(--y, 60%), rgba(0,180,255,0.12), transparent 60%);
  animation: driftLight 16s infinite alternate ease-in-out;
  z-index: 0;
}
@keyframes driftLight {
  0% { --x: 20%; --y: 30%; }
  50% { --x: 80%; --y: 70%; }
  100% { --x: 40%; --y: 90%; }
}
/*Hiệu ứng hover phát sáng cho thẻ */
.card, .proj-card, .contact-card, .cert-item {
  position: relative;
  z-index: 1;
  transition: box-shadow 0.4s ease, transform 0.4s ease, border 0.4s ease;
}
.card:hover, .proj-card:hover, .contact-card:hover, .cert-item:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 0 35px rgba(0, 200, 255, 0.3);
  border-color: rgba(0,200,255,0.3);
}
/*  Hiệu ứng ánh sáng lướt trên nút */
.btn {
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: "";
  position: absolute;
  top: 0;
  left: -150%;
  width: 300%;
  height: 100%;
  background: linear-gradient(120deg, transparent, rgba(0,255,255,0.4), transparent);
  transition: all 0.8s ease;
}
.btn:hover::after {
  left: 150%;
}
/* Hiệu ứng gạch chân phát sáng cho tiêu đề */
h2 {
  position: relative;
  z-index: 2;
}
h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  border-radius: 3px;
  margin-top: 6px;
  background: linear-gradient(90deg, rgba(0,200,255,1), transparent);
  animation: glowLine 3s infinite alternate;
}
@keyframes glowLine {
  from { opacity: 0.5; width: 40px; }
  to { opacity: 1; width: 80px; }
}