/* ============================================================
   Achintya Tripathi — Portfolio
   ============================================================ */

:root {
  --bg:        #07080c;
  --bg-soft:   #0d0f16;
  --surface:   rgba(255, 255, 255, 0.035);
  --surface-2: rgba(255, 255, 255, 0.06);
  --border:    rgba(255, 255, 255, 0.09);
  --border-2:  rgba(255, 255, 255, 0.16);

  --text:      #e9ecf3;
  --text-dim:  #9aa3b5;
  --text-mute: #6b7385;

  --accent:    #6c8cff;
  --accent-2:  #37e0c4;
  --accent-3:  #b06cff;

  --radius:    16px;
  --radius-sm: 10px;
  --max:       1120px;

  --font-display: 'Sora', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.2; margin: 0; }
.mono { font-family: var(--font-mono); }
strong { color: #fff; font-weight: 600; }
em { color: var(--accent-2); font-style: normal; }

.container { width: min(100% - 44px, var(--max)); margin-inline: auto; }

/* ---------- background decoration ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.028) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 75%);
}
.bg-glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(600px 420px at 12% -5%, rgba(108,140,255,0.20), transparent 65%),
    radial-gradient(520px 380px at 88% 8%,  rgba(176,108,255,0.14), transparent 65%),
    radial-gradient(700px 500px at 50% 105%, rgba(55,224,196,0.08), transparent 65%);
}

.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 200; transition: width 0.1s linear;
}

/* ============================ NAV ============================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(7, 8, 12, 0.75);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}
.nav-inner {
  width: min(100% - 44px, var(--max)); margin-inline: auto;
  height: 70px; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.brand-mark {
  width: 34px; height: 34px; display: grid; place-items: center;
  border-radius: 9px; font-family: var(--font-display); font-size: 13px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #fff; letter-spacing: 0.5px;
}
.brand-text { font-family: var(--font-display); font-size: 15px; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 13px; border-radius: 8px; font-size: 14.5px; color: var(--text-dim);
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-links a.active { color: var(--text); }
.nav-links a.nav-cta {
  margin-left: 8px; color: var(--text);
  border: 1px solid var(--border-2); background: var(--surface);
}
.nav-links a.nav-cta:hover { border-color: var(--accent); color: #fff; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; padding: 8px;
  background: none; border: 0; cursor: pointer;
}
.nav-toggle span {
  width: 22px; height: 2px; background: var(--text); border-radius: 2px;
  transition: transform 0.25s, opacity 0.2s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================ HERO ============================ */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; padding: 120px 0 90px; }
.hero-inner {
  display: grid; grid-template-columns: 1.35fr 0.9fr; gap: 60px; align-items: center;
}

.eyebrow {
  font-family: var(--font-mono); font-size: 14px; color: var(--accent-2);
  margin: 0 0 14px; letter-spacing: 0.4px;
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem); font-weight: 700; letter-spacing: -1.5px; margin-bottom: 10px;
}
.grad {
  background: linear-gradient(100deg, var(--accent) 0%, var(--accent-3) 45%, var(--accent-2) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-role {
  font-size: clamp(1.05rem, 2.4vw, 1.5rem); font-weight: 600; color: var(--text-dim);
  margin-bottom: 22px; min-height: 1.9em;
}
.hero-role .mono { color: var(--accent-2); }
#typed { color: var(--text); }
.caret {
  display: inline-block; width: 2px; height: 1.05em; margin-left: 3px;
  background: var(--accent-2); vertical-align: text-bottom;
  animation: blink 1s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

.hero-desc { color: var(--text-dim); max-width: 58ch; margin: 0 0 22px; }

.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.hero-meta span {
  font-size: 13px; color: var(--text-dim); padding: 5px 12px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 30px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 24px; border-radius: 10px; font-weight: 600; font-size: 15px;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, background 0.2s;
}
.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-3));
  color: #fff; box-shadow: 0 8px 26px rgba(108, 140, 255, 0.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(108, 140, 255, 0.4); }
.btn-ghost { border: 1px solid var(--border-2); color: var(--text); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent-2); transform: translateY(-2px); }

.socials { display: flex; gap: 10px; }
.socials a {
  width: 40px; height: 40px; display: grid; place-items: center;
  border: 1px solid var(--border); border-radius: 10px; background: var(--surface);
  color: var(--text-dim); transition: all 0.2s;
}
.socials a svg { width: 18px; height: 18px; }
.socials a:hover { color: #fff; border-color: var(--accent); transform: translateY(-3px); background: var(--surface-2); }

/* hero visual */
.hero-visual { position: relative; display: grid; place-items: center; }
.avatar-ring {
  width: min(320px, 74vw); aspect-ratio: 1; border-radius: 50%; padding: 3px;
  background: conic-gradient(from 0deg, var(--accent), var(--accent-3), var(--accent-2), var(--accent));
  animation: spin 9s linear infinite;
  box-shadow: 0 0 70px rgba(108, 140, 255, 0.22);
}
@keyframes spin { to { transform: rotate(360deg); } }
.avatar {
  width: 100%; height: 100%; border-radius: 50%; overflow: hidden;
  background: var(--bg-soft); animation: spin 9s linear infinite reverse;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar-fallback {
  width: 100%; height: 100%; display: grid; place-items: center;
  font-family: var(--font-display); font-size: 5rem; font-weight: 700; color: var(--text-mute);
  background: linear-gradient(160deg, #12151f, #0a0c12);
}

.float-chip {
  position: absolute; padding: 7px 14px; font-size: 12.5px;
  background: rgba(13, 15, 22, 0.9); border: 1px solid var(--border-2);
  border-radius: 999px; backdrop-filter: blur(6px);
  animation: bob 5s ease-in-out infinite;
}
.chip-1 { top: 8%;  left: -6%;  color: var(--accent-2); }
.chip-2 { top: 46%; right: -10%; color: var(--accent);   animation-delay: -1.7s; }
.chip-3 { bottom: 6%; left: 2%;  color: var(--accent-3); animation-delay: -3.2s; }
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-11px); } }

.scroll-cue {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  width: 24px; height: 38px; border: 2px solid var(--border-2); border-radius: 14px;
}
.scroll-cue span {
  position: absolute; top: 7px; left: 50%; margin-left: -2px;
  width: 4px; height: 7px; border-radius: 2px; background: var(--accent-2);
  animation: cue 1.8s ease-in-out infinite;
}
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(13px); } }

/* ============================ STATS ============================ */
.stats-strip { border-block: 1px solid var(--border); background: rgba(255,255,255,0.015); }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding: 38px 0;
}
.stat { text-align: center; }
.stat b {
  display: block; font-family: var(--font-display); font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  font-weight: 700; color: var(--accent-2); letter-spacing: -1px;
}
.stat span { font-size: 13.5px; color: var(--text-mute); }

/* ============================ SECTIONS ============================ */
.section { padding: 100px 0; }
.section-tag {
  font-family: var(--font-mono); font-size: 13px; color: var(--accent);
  letter-spacing: 1.2px; text-transform: uppercase; margin: 0 0 8px;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem); letter-spacing: -1px; margin-bottom: 44px;
}

/* ---------- about ---------- */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 46px; align-items: start; }
.about-copy p { color: var(--text-dim); margin: 0 0 18px; }
.about-facts {
  list-style: none; margin: 0; padding: 22px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.about-facts li {
  display: flex; justify-content: space-between; gap: 16px; align-items: baseline;
  padding: 11px 0; border-bottom: 1px dashed var(--border);
}
.about-facts li:last-child { border-bottom: 0; }
.about-facts .k { font-size: 13px; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.6px; white-space: nowrap; }
.about-facts .v { font-size: 14px; text-align: right; }

/* ---------- timeline ---------- */
.timeline { position: relative; padding-left: 30px; }
.timeline::before {
  content: ''; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-3), transparent);
}
.tl-item { position: relative; margin-bottom: 22px; }
.tl-dot {
  position: absolute; left: -30px; top: 24px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(108, 140, 255, 0.12);
}
.tl-card {
  padding: 24px 26px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); transition: border-color 0.25s, transform 0.25s, background 0.25s;
}
.tl-card:hover { border-color: var(--border-2); transform: translateX(4px); background: var(--surface-2); }
.tl-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; align-items: baseline; }
.tl-head h3, .tl-head h4 { font-size: 1.12rem; }
.tl-date { font-family: var(--font-mono); font-size: 12.5px; color: var(--accent-2); white-space: nowrap; }
.tl-org { color: var(--text-mute); font-size: 14px; margin: 4px 0 12px; }
.dot { opacity: 0.5; margin: 0 4px; }
.tl-card ul { margin: 0 0 14px; padding-left: 18px; color: var(--text-dim); font-size: 15px; }
.tl-card li { margin-bottom: 7px; }
.tl-card li::marker { color: var(--accent); }

.tags { display: flex; flex-wrap: wrap; gap: 7px; }
.tags span {
  font-family: var(--font-mono); font-size: 11.5px; padding: 4px 10px;
  border: 1px solid var(--border); border-radius: 6px; color: var(--text-mute);
  background: rgba(255,255,255,0.02);
}

/* ---------- projects ---------- */
.project-feature {
  display: grid; grid-template-columns: 1.25fr 0.85fr; gap: 36px; align-items: start;
  padding: 32px; margin-bottom: 26px;
  border: 1px solid var(--border-2); border-radius: 20px;
  background: linear-gradient(135deg, rgba(108,140,255,0.09), rgba(176,108,255,0.05) 55%, transparent);
}
.pf-kicker { font-family: var(--font-mono); font-size: 12.5px; color: var(--accent-2); margin: 0 0 8px; }
.project-feature h3 { font-size: clamp(1.4rem, 3vw, 1.9rem); margin-bottom: 12px; letter-spacing: -0.5px; }
.project-feature p { color: var(--text-dim); margin: 0 0 16px; }
.pf-repos { margin-top: 24px; padding-top: 20px; border-top: 1px dashed var(--border-2); }
.pf-repos-label {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 1px; text-transform: uppercase;
  color: var(--text-mute); margin: 0 0 14px;
}
.pf-repo {
  display: flex; gap: 14px; padding: 16px 18px; margin-bottom: 12px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: rgba(7, 8, 12, 0.45);
  transition: border-color 0.25s, transform 0.25s, background 0.25s;
}
.pf-repo:last-child { margin-bottom: 0; }
.pf-repo:hover { border-color: var(--border-2); background: rgba(7, 8, 12, 0.7); transform: translateX(4px); }
.pf-repo-icon { font-size: 1.25rem; line-height: 1.5; }
.pf-repo h4 { font-size: 1rem; margin-bottom: 5px; }
.pf-repo p { font-size: 14px; color: var(--text-dim); margin: 0 0 10px; }
.pf-repo .tags { margin-bottom: 0; }

.pf-visual { display: grid; gap: 9px; align-self: start; position: sticky; top: 100px; }
.pf-layer {
  padding: 13px 16px; border-radius: var(--radius-sm); font-family: var(--font-mono); font-size: 13px;
  border: 1px solid var(--border); background: rgba(7,8,12,0.6); color: var(--text-dim);
  transition: transform 0.25s, border-color 0.25s, color 0.25s;
}
.pf-visual:hover .pf-layer { border-color: var(--border-2); }
.pf-layer:hover { transform: translateX(7px); color: var(--accent-2); border-color: var(--accent-2); }

.project-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.card {
  display: flex; flex-direction: column; gap: 11px; padding: 24px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.card:hover {
  transform: translateY(-5px); border-color: var(--border-2);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
}
.card-top { display: flex; justify-content: space-between; align-items: center; }
.card-icon { font-size: 1.5rem; }
.card-year { font-family: var(--font-mono); font-size: 12px; color: var(--text-mute); }
.card h3 { font-size: 1.08rem; }
.card p { color: var(--text-dim); font-size: 14.5px; margin: 0; flex-grow: 1; }
.card-link { font-size: 14px; color: var(--accent); font-weight: 500; transition: color 0.2s; }
.card-link:hover { color: var(--accent-2); }

/* ---------- skills ---------- */
.skill-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.skill-block {
  padding: 24px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.skill-block h3 { font-size: 1rem; color: var(--accent-2); margin-bottom: 14px; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; }
.pills span {
  font-size: 13px; padding: 6px 13px; border-radius: 999px;
  border: 1px solid var(--border); background: rgba(255,255,255,0.025); color: var(--text-dim);
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
}
.pills span:hover { border-color: var(--accent); color: var(--text); transform: translateY(-2px); }

.edu-cert { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 40px; }
.edu h3, .certs h3 { font-size: 1rem; color: var(--accent-2); margin-bottom: 14px; }
.edu-card {
  padding: 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.pills-cert span { font-size: 12.5px; }

/* clickable certificate pills */
.pills .pill-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; padding: 6px 13px; border-radius: 999px;
  border: 1px solid var(--border-2); background: rgba(108, 140, 255, 0.08);
  color: var(--text); cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}
.pills .pill-link::after { content: '↗'; font-size: 11px; color: var(--accent-2); }
.pills .pill-link:hover {
  border-color: var(--accent); background: rgba(108, 140, 255, 0.16); transform: translateY(-2px);
}
.pills .pill-link:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.pills .pill-date {
  padding: 0 0 0 4px; border: 0; background: none; font-family: var(--font-mono);
  font-size: 10.5px; color: var(--text-mute);
}
.pills .pill-date:hover, .pills .pill-link:hover .pill-date { transform: none; }

/* ---------- contact ---------- */
.contact { padding-bottom: 90px; }
.contact-lead { color: var(--text-dim); max-width: 60ch; margin: -28px 0 34px; }
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.contact-card {
  display: flex; flex-direction: column; gap: 3px; padding: 22px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  transition: transform 0.25s, border-color 0.25s, background 0.25s;
}
.contact-card:hover { transform: translateY(-4px); border-color: var(--accent); background: var(--surface-2); }
.cc-icon { font-size: 1.4rem; margin-bottom: 6px; }
.cc-label { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-mute); }
.cc-value { font-size: 14.5px; color: var(--text); word-break: break-word; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 26px 0; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between; align-items: center; }
.footer p { margin: 0; font-size: 13.5px; color: var(--text-mute); }
.to-top { font-size: 13.5px; color: var(--text-dim); transition: color 0.2s; }
.to-top:hover { color: var(--accent-2); }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ============================ RESPONSIVE ============================ */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 46px; }
  .hero-visual { order: -1; }
  .about-grid, .project-feature, .edu-cert { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 26px; }
  .pf-visual { order: -1; position: static; }
}

@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .nav { background: rgba(7,8,12,0.85); backdrop-filter: blur(14px); border-bottom-color: var(--border); }
  .nav-links {
    position: fixed; inset: 70px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    padding: 10px 22px 22px; background: rgba(7,8,12,0.97); backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-140%); transition: transform 0.3s ease; max-height: calc(100svh - 70px); overflow-y: auto;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 13px 6px; border-bottom: 1px solid var(--border); border-radius: 0; }
  .nav-links a.nav-cta { margin: 12px 0 0; border-radius: 9px; text-align: center; border: 1px solid var(--border-2); }
  .section { padding: 74px 0; }
  .brand-text { display: none; }
  .scroll-cue { display: none; }
  .float-chip { display: none; }
  .project-feature { padding: 24px; }
  .tl-card { padding: 20px; }
  .about-facts li { flex-direction: column; gap: 2px; }
  .about-facts .v { text-align: left; }
}

@media (max-width: 420px) {
  .stats-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { flex: 1 1 100%; }
}

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