/* ============================================================
   style.css — Bài Tập Lab Portfolio
   Aesthetic: Dark editorial + mono-industrial
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;800&family=DM+Mono:wght@300;400;500&display=swap');

/* ---- Variables -------------------------------------------- */
:root {
  --bg:        #0c0c0d;
  --surface:   #141416;
  --border:    #252528;
  --accent:    #e8ff47;
  --accent2:   #ff6b35;
  --text:      #f0ede8;
  --muted:     #5a5a62;
  --card-h:    #1a1a1e;

  --font-display: 'Syne', sans-serif;
  --font-mono:    'DM Mono', monospace;
}

/* ---- Reset ------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ---- Noise overlay ---------------------------------------- */
.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  opacity: .03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px;
}

/* ---- Header ----------------------------------------------- */
.header {
  padding: 72px 60px 60px;
  border-bottom: 1px solid var(--border);
  position: relative;
  animation: fadeDown .7s ease both;
}

.header-tag {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 300;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
}

.header-title {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: .95;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.line1 {
  font-size: clamp(3.5rem, 9vw, 7rem);
  color: var(--text);
}

.line2 {
  font-size: clamp(3.5rem, 9vw, 7rem);
  color: transparent;
  -webkit-text-stroke: 1.5px var(--muted);
}

.header-sub {
  margin-top: 28px;
  font-size: 18px;
  font-weight: 300;
  color: white;
  max-width: 400px;
  line-height: 1.75;
}

.header-deco {
  position: absolute;
  right: 60px;
  bottom: 28px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--muted);
}

/* ---- Main grid -------------------------------------------- */
.main {
  flex: 1;
  padding: 0 60px 60px;
}

.lab-grid {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
  margin-top: 40px;
}

/* ---- Lab card --------------------------------------------- */
.lab-card {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 28px 32px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  background: transparent;
  position: relative;
  overflow: hidden;
  transition: background .25s ease, padding-left .25s ease;

  animation: fadeUp .5s ease both;
  animation-delay: calc(var(--i) * 90ms + 200ms);
}

.lab-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--accent) 0%, transparent 100%);
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  transition: opacity .3s ease, transform .3s ease;
}

.lab-card:hover {
  background: var(--card-h);
  padding-left: 44px;
}

.lab-card:hover::before {
  opacity: .06;
  transform: scaleX(1);
}

.lab-num {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .15em;
  color: var(--accent);
  min-width: 28px;
  transition: color .25s;
}

.lab-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  flex: 1;
  transition: color .25s;
}

.lab-card:hover .lab-name {
  color: var(--accent);
}

.lab-arrow {
  font-size: 1.1rem;
  color: var(--muted);
  transform: translateX(0);
  transition: transform .3s ease, color .3s ease;
}

.lab-card:hover .lab-arrow {
  transform: translateX(8px);
  color: var(--accent);
}

/* ---- Footer ----------------------------------------------- */
.footer {
  padding: 24px 60px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: .7rem;
  font-weight: 300;
  color: var(--muted);
  letter-spacing: .1em;
}

.footer-dot {
  font-size: .5rem;
  color: var(--accent);
}

/* ---- Animations ------------------------------------------- */
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-18px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---- Responsive ------------------------------------------- */
@media (max-width: 640px) {
  .header       { padding: 48px 24px 40px; }
  .header-deco  { right: 24px; }
  .main         { padding: 0 24px 48px; }
  .footer       { padding: 20px 24px; }

  .lab-card {
    padding: 22px 20px;
    gap: 20px;
  }

  .lab-card:hover { padding-left: 28px; }
}