/* =========================================================
   Srabon Debnath — Portfolio
   Modern dark · aurora gradient · glassmorphism · bento
   ========================================================= */

:root {
  --bg: #06070d;
  --bg-soft: #0b0d18;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-2: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.09);
  --border-bright: rgba(255, 255, 255, 0.16);
  --text: #eef1ff;
  --text-dim: #a6acc8;
  --text-faint: #6b7196;

  --accent: #6c8cff;     /* indigo */
  --accent-2: #57e6c9;   /* teal   */
  --accent-3: #b98bff;   /* violet */
  --accent-glow: rgba(108, 140, 255, 0.45);

  --radius: 20px;
  --radius-sm: 13px;
  --maxw: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Sora", "Inter", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ---------- animated aurora background ---------- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -3;
  overflow: hidden;
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(108, 140, 255, 0.12), transparent 60%),
    radial-gradient(900px 600px at 0% 20%, rgba(185, 139, 255, 0.10), transparent 55%),
    var(--bg);
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  will-change: transform;
}
.blob-1 {
  width: 520px; height: 520px;
  background: radial-gradient(circle at 30% 30%, #4f6bff, transparent 70%);
  top: -120px; left: -80px;
  animation: drift1 22s var(--ease) infinite alternate;
}
.blob-2 {
  width: 460px; height: 460px;
  background: radial-gradient(circle at 70% 40%, #57e6c9, transparent 70%);
  top: 30%; right: -120px;
  animation: drift2 26s var(--ease) infinite alternate;
}
.blob-3 {
  width: 440px; height: 440px;
  background: radial-gradient(circle at 50% 50%, #b98bff, transparent 70%);
  bottom: -140px; left: 35%;
  animation: drift3 30s var(--ease) infinite alternate;
}
@keyframes drift1 { to { transform: translate(120px, 80px) scale(1.15); } }
@keyframes drift2 { to { transform: translate(-100px, 60px) scale(1.1); } }
@keyframes drift3 { to { transform: translate(80px, -90px) scale(1.2); } }

/* subtle grid overlay */
.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at 50% 0%, black, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 0%, black, transparent 75%);
}

/* cursor glow (desktop) */
.cursor-glow {
  position: fixed;
  width: 460px; height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108, 140, 255, 0.10), transparent 65%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: -1;
  left: 50%; top: 30%;
  transition: opacity 0.4s ease;
  opacity: 0;
}

/* ---------- nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(20px, 5vw, 56px);
  transition: background 0.35s ease, backdrop-filter 0.35s ease, padding 0.35s ease, border-color 0.35s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(8, 9, 16, 0.6);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  padding-top: 13px; padding-bottom: 13px;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: -0.01em; }
.brand-mark {
  display: grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow: 0 6px 22px var(--accent-glow);
  color: #fff;
}
.brand-text { font-size: 0.98rem; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  font-size: 0.9rem;
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: 9px;
  transition: color 0.25s, background 0.25s;
}
.nav-links a:hover { color: var(--text); background: var(--surface-2); }
.nav-links .nav-cta {
  color: var(--text);
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow: 0 6px 22px var(--accent-glow);
}
.nav-links .nav-cta:hover { filter: brightness(1.1); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px; border-radius: 2px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- layout ---------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px, 5vw, 40px); }
.section { padding: clamp(70px, 11vh, 130px) 0; }

.section-head { margin-bottom: 52px; max-width: 760px; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--accent-2);
  margin-bottom: 14px;
}
.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 700;
}

/* ---------- hero ---------- */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 50px;
  padding-top: 120px;
  padding-bottom: 60px;
}
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 0.82rem;
  color: var(--text-dim);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 100px;
  backdrop-filter: blur(8px);
  margin-bottom: 28px;
}
.status-pill .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 0 rgba(87, 230, 201, 0.6);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(87, 230, 201, 0.5); }
  70% { box-shadow: 0 0 0 8px rgba(87, 230, 201, 0); }
  100% { box-shadow: 0 0 0 0 rgba(87, 230, 201, 0); }
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 800;
  margin-bottom: 24px;
}
.grad-text {
  background: linear-gradient(110deg, var(--accent), var(--accent-3));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.grad-text-2 {
  background: linear-gradient(110deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 1.08rem;
  color: var(--text-dim);
  max-width: 540px;
  margin-bottom: 34px;
}
.hero-sub strong { color: var(--text); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 26px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, background 0.25s, border-color 0.25s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #fff;
  box-shadow: 0 10px 30px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 40px var(--accent-glow); }
.btn-primary .arrow { transition: transform 0.25s var(--ease); }
.btn-primary:hover .arrow { transform: translateX(4px); }
.btn-ghost {
  background: var(--surface);
  border-color: var(--border-bright);
  color: var(--text);
}
.btn-ghost:hover { transform: translateY(-3px); background: var(--surface-2); border-color: var(--accent); }

.hero-socials { display: flex; align-items: center; gap: 12px; font-size: 0.88rem; color: var(--text-dim); flex-wrap: wrap; }
.hero-socials a { transition: color 0.25s; border-bottom: 1px solid transparent; }
.hero-socials a:hover { color: var(--accent-2); border-color: var(--accent-2); }
.hero-socials .sep { color: var(--text-faint); }

/* hero code card */
.hero-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.07), rgba(255,255,255,0.02));
  border: 1px solid var(--border-bright);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(16px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  animation: float 7s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }
.hc-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid var(--border);
}
.hc-dot { width: 11px; height: 11px; border-radius: 50%; }
.hc-dot.r { background: #ff5f57; } .hc-dot.y { background: #febc2e; } .hc-dot.g { background: #28c840; }
.hc-file { margin-left: 10px; font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-faint); }
.hc-code {
  padding: 20px 22px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.85;
  color: #cfd6f5;
  overflow-x: auto;
}
.c-key { color: var(--accent-3); } .c-str { color: var(--accent-2); }
.c-fn { color: var(--accent); } .c-num { color: #ffb86c; } .c-com { color: var(--text-faint); font-style: italic; }

/* ---------- stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  padding: 20px 0 40px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 28px 24px;
  text-align: center;
  backdrop-filter: blur(8px);
  transition: transform 0.3s var(--ease), border-color 0.3s;
}
.stat:hover { transform: translateY(-5px); border-color: var(--accent); }
.stat-num {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 800;
  background: linear-gradient(120deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-plus {
  font-family: var(--font-display);
  font-size: 1.6rem; font-weight: 800; color: var(--accent-2);
  -webkit-text-fill-color: var(--accent-2);
}
.stat-label { display: block; margin-top: 8px; font-size: 0.85rem; color: var(--text-dim); }

/* ---------- about ---------- */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 30px; align-items: start; }
.about-lead p { font-size: 1.06rem; color: var(--text-dim); margin-bottom: 18px; }
.about-lead strong { color: var(--text); }
.about-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.about-tags span {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--accent-2);
  border: 1px solid var(--border-bright);
  border-radius: 100px;
  padding: 6px 14px;
  background: var(--surface);
}
.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  backdrop-filter: blur(10px);
}
.about-photo {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-bright);
  margin-bottom: 22px;
}
.about-card h3 { font-family: var(--font-display); font-size: 1.1rem; margin-bottom: 18px; }
.facts { list-style: none; }
.facts li {
  display: flex; justify-content: space-between; gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
}
.facts li:last-child { border-bottom: none; }
.facts span { color: var(--text-faint); }
.facts strong { color: var(--text); text-align: right; font-weight: 600; }

/* ---------- bento stack ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.bento-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  backdrop-filter: blur(8px);
  transition: transform 0.3s var(--ease), border-color 0.3s, background 0.3s;
  position: relative;
  overflow: hidden;
}
.bento-card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 0%), rgba(108,140,255,0.12), transparent 60%);
  opacity: 0; transition: opacity 0.3s;
}
.bento-card:hover { transform: translateY(-5px); border-color: var(--border-bright); }
.bento-card:hover::before { opacity: 1; }
.bento-card.span-2 { grid-column: span 2; }
.bento-icon { font-size: 1.7rem; margin-bottom: 12px; }
.bento-card h3 { font-family: var(--font-display); font-size: 1.12rem; margin-bottom: 16px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips span {
  font-size: 0.82rem;
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.chips span:hover { color: var(--text); border-color: var(--accent); background: rgba(108,140,255,0.1); }
.chips.small span { font-size: 0.76rem; padding: 5px 10px; }

/* ---------- timeline ---------- */
.timeline { position: relative; padding-left: 34px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(var(--accent), var(--accent-3), transparent);
}
.tl-item { position: relative; margin-bottom: 28px; }
.tl-item:last-child { margin-bottom: 0; }
.tl-dot {
  position: absolute; left: -34px; top: 6px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(108,140,255,0.15);
}
.tl-when {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-2);
  margin-bottom: 10px;
}
.tl-body { border-radius: var(--radius); padding: 26px 28px; }
.tl-body h3 { font-family: var(--font-display); font-size: 1.25rem; }
.tl-org { color: var(--text-dim); font-size: 0.92rem; margin: 4px 0 16px; }
.tl-body ul { list-style: none; display: grid; gap: 12px; }
.tl-body li { position: relative; padding-left: 22px; color: var(--text-dim); font-size: 0.96rem; }
.tl-body li::before { content: "▹"; position: absolute; left: 0; color: var(--accent-2); }
.tl-body strong { color: var(--text); }

/* glass surface */
.glass {
  background: linear-gradient(160deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* ---------- projects ---------- */
.projects { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.project {
  border-radius: var(--radius);
  padding: 30px;
  transition: transform 0.35s var(--ease), border-color 0.35s, box-shadow 0.35s;
}
.project:hover { transform: translateY(-6px); border-color: var(--border-bright); box-shadow: 0 24px 60px rgba(0,0,0,0.45); }
.proj-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.proj-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-2);
  border: 1px solid var(--border-bright);
  border-radius: 100px;
  padding: 5px 12px;
  background: var(--surface);
}
.proj-links a { font-size: 0.84rem; color: var(--accent); font-weight: 600; transition: color 0.2s; }
.proj-links a:hover { color: var(--accent-2); }
.project h3 { font-family: var(--font-display); font-size: 1.35rem; margin-bottom: 12px; letter-spacing: -0.02em; }
.project > p { color: var(--text-dim); font-size: 0.96rem; margin-bottom: 18px; }
.proj-meta { display: grid; gap: 10px; margin-bottom: 18px; }
.proj-meta div { display: grid; grid-template-columns: 90px 1fr; gap: 12px; align-items: start; }
.proj-meta .k {
  font-family: var(--font-mono); font-size: 0.74rem; color: var(--accent-3);
  text-transform: uppercase; letter-spacing: 0.04em; padding-top: 2px;
}
.proj-meta .v { font-size: 0.9rem; color: var(--text-dim); }

/* ---------- credentials ---------- */
.cred-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cred { border-radius: var(--radius); padding: 28px; transition: transform 0.3s var(--ease), border-color 0.3s; }
.cred:hover { transform: translateY(-5px); border-color: var(--accent); }
.cred-icon { font-size: 1.9rem; margin-bottom: 14px; }
.cred-photo {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  object-position: center 28%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-bright);
  margin-bottom: 18px;
}
.cred-grad .cred-icon { display: none; }
.cred h3 { font-family: var(--font-display); font-size: 1.12rem; margin-bottom: 6px; line-height: 1.25; }
.cred-org { color: var(--text); font-size: 0.92rem; }
.cred-date { color: var(--accent-2); font-family: var(--font-mono); font-size: 0.8rem; margin: 4px 0 14px; }
.cred-note { color: var(--text-dim); font-size: 0.9rem; }

/* ---------- contact ---------- */
.contact { display: flex; justify-content: center; }
.contact-card {
  border-radius: 26px;
  padding: clamp(36px, 6vw, 64px);
  text-align: center;
  max-width: 720px;
  width: 100%;
  position: relative;
  overflow: hidden;
}
.contact-card::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(600px circle at 50% -20%, rgba(108,140,255,0.18), transparent 60%);
}
.contact-card h2 { font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 2.8rem); margin: 12px 0 16px; letter-spacing: -0.025em; }
.contact-card > p { color: var(--text-dim); max-width: 520px; margin: 0 auto 30px; }
.contact-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; margin-bottom: 26px; }
.contact-links { display: flex; justify-content: center; gap: 22px; flex-wrap: wrap; font-size: 0.9rem; }
.contact-links a { color: var(--text-dim); border-bottom: 1px solid transparent; transition: color 0.2s, border-color 0.2s; }
.contact-links a:hover { color: var(--accent-2); border-color: var(--accent-2); }

/* ---------- footer ---------- */
.footer {
  text-align: center;
  padding: 40px 20px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 0.84rem;
  margin-top: 40px;
}

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 110px; min-height: auto; }
  .hero-card { max-width: 520px; }
  .about-grid { grid-template-columns: 1fr; }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .bento-card.span-2 { grid-column: span 2; }
  .projects { grid-template-columns: 1fr; }
  .cred-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .nav-links {
    position: fixed;
    top: 64px; left: 16px; right: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 16px;
    background: rgba(10, 12, 22, 0.92);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 16px;
    transform: translateY(-14px);
    opacity: 0; pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
  }
  .nav-links.open { opacity: 1; transform: none; pointer-events: auto; }
  .nav-links a { padding: 12px 16px; }
  .nav-toggle { display: flex; }
  .bento { grid-template-columns: 1fr; }
  .bento-card.span-2 { grid-column: span 1; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .proj-meta div { grid-template-columns: 1fr; gap: 2px; }
  .hero-title { font-size: clamp(2.1rem, 9vw, 3rem); }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}