/* ================================================================
   Sathwik Mamidi, technical co-founder portfolio
   Dark, restrained, engineering-grade.
   bg #0D0F0E / text #E9EBE7 / accent #4CC38A
   Inter Tight (headings) · Inter (body) · JetBrains Mono (meta)
   ================================================================ */

:root {
  --bg: #0D0F0E;
  --surface: #131614;
  --surface-2: #181C19;
  --text: #E9EBE7;
  --muted: #9AA29B;
  --line: #232823;
  --line-soft: #1B201C;
  --accent: #4CC38A;
  --accent-dim: #2E6B4C;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --sans: "Inter", system-ui, sans-serif;
  --display: "Inter Tight", "Inter", system-ui, sans-serif;
  --pad: clamp(1.25rem, 5vw, 4rem);
  --max: 72rem;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 5rem; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 450;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* faint dot grid over the whole page */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(233,235,231,0.045) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

/* soft ambient glow behind the hero */
.glow {
  position: absolute;
  top: -20vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(90vw, 60rem);
  height: 60vh;
  background: radial-gradient(ellipse at center, rgba(76,195,138,0.10), transparent 65%);
  pointer-events: none;
  z-index: 0;
}

main, header, footer { position: relative; z-index: 1; }

::selection { background: var(--accent); color: var(--bg); }

a { color: inherit; }
a:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

.mono { font-family: var(--mono); }

.kicker {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* ---------------- top bar ---------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem var(--pad);
  background: rgba(13,15,14,0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

.wordmark {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.topnav {
  display: flex;
  align-items: center;
  gap: clamp(0.9rem, 2.5vw, 2rem);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.topnav a { text-decoration: none; color: var(--muted); transition: color 0.15s ease; }
.topnav a:hover { color: var(--text); }
.topnav a.gh { color: var(--text); }
.topnav a.gh:hover { color: var(--accent); }

/* ---------------- hero ---------------- */

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(5rem, 14vh, 9rem) var(--pad) clamp(4rem, 10vh, 7rem);
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 1.75rem;
}

.hero h1 {
  font-family: var(--display);
  font-weight: 650;
  font-size: clamp(2.1rem, 5.4vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  max-width: 56rem;
  margin-bottom: 1.75rem;
}

.hero-body p {
  max-width: 44rem;
  font-size: clamp(1.02rem, 1.3vw, 1.15rem);
  color: var(--muted);
}

.hero-current {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  margin-top: 2.25rem;
  font-size: 0.82rem;
  color: var(--muted);
}
.hero-current a { color: var(--accent); font-weight: 500; }

.pulse {
  flex: none;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  align-self: center;
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(76,195,138,0.4); }
  50%      { box-shadow: 0 0 0 6px rgba(76,195,138,0); }
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2.25rem; }

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.7rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  background: var(--surface);
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover { border-color: var(--accent-dim); background: var(--surface-2); }
.btn.solid { background: var(--accent); border-color: var(--accent); color: #08110C; font-weight: 600; }
.btn.solid:hover { background: #5CD69B; border-color: #5CD69B; }

/* hero load animation */
@media (prefers-reduced-motion: no-preference) {
  .anim {
    opacity: 0;
    transform: translateY(12px);
    animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
    animation-delay: calc(var(--d) * 110ms);
  }
  @keyframes rise { to { opacity: 1; transform: none; } }
}

/* ---------------- sections ---------------- */

section { padding: clamp(3.5rem, 9vh, 6.5rem) var(--pad); }

.section-head {
  max-width: var(--max);
  margin: 0 auto 3rem;
}

.section-head .kicker { display: block; margin-bottom: 0.9rem; }

.section-head h2 {
  font-family: var(--display);
  font-weight: 650;
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  letter-spacing: -0.02em;
}

/* ---------------- work cards ---------------- */

.work { border-top: 1px solid var(--line-soft); }

.cards {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(26rem, 100%), 1fr));
  gap: 1.5rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }

.shot {
  display: block;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
}
.shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top;
  filter: saturate(0.96);
  transition: filter 0.2s ease;
}
.card:hover .shot img { filter: saturate(1.05); }

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.5rem 1.6rem 1.7rem;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.74rem;
}

.card .year { color: var(--muted); letter-spacing: 0.08em; }

.card .links a {
  color: var(--accent);
  font-weight: 500;
  text-decoration: none;
  margin-left: 0.9rem;
}
.card .links a:first-child { margin-left: 0; }
.card .links a:hover { text-decoration: underline; }

.card h3 {
  font-family: var(--display);
  font-weight: 650;
  font-size: 1.3rem;
  letter-spacing: -0.015em;
}

.card p { color: var(--muted); font-size: 0.94rem; }

.card .stack {
  margin-top: 0.4rem;
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.85;
}

/* ---------------- earlier work ---------------- */

.earlier {
  max-width: var(--max);
  margin: 4rem auto 0;
}

.earlier .kicker { display: block; margin-bottom: 1.25rem; }

.earlier-list { list-style: none; border-top: 1px solid var(--line); }

.earlier-list li {
  display: grid;
  grid-template-columns: 7.5rem 1fr 14rem;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.earlier-list .year { font-size: 0.74rem; color: var(--muted); letter-spacing: 0.08em; }

.earlier-list h4 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.2rem;
}

.earlier-list p { color: var(--muted); font-size: 0.92rem; max-width: 36rem; }

.earlier-list .stack {
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.85;
  text-align: right;
}

/* ---------------- utilities ---------------- */

.utilities {
  max-width: var(--max);
  margin: 4rem auto 0;
}

.utilities .kicker { display: block; margin-bottom: 1.25rem; }

.util-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 0.7rem;
  font-size: 0.78rem;
}

.util-grid li {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: border-color 0.15s ease;
}
.util-grid li:hover { border-color: var(--accent-dim); }
.util-grid a { font-weight: 500; text-decoration: none; color: var(--text); }
.util-grid a:hover { color: var(--accent); }
.util-grid span { color: var(--muted); }

/* ---------------- capabilities ---------------- */

.capabilities { border-top: 1px solid var(--line-soft); }

.cap-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}
@media (max-width: 1100px) { .cap-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px)  { .cap-grid { grid-template-columns: 1fr; } }

.cap-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.75rem;
}

.cap-grid h3 {
  font-family: var(--display);
  font-weight: 650;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
}

.cap-grid p { color: var(--muted); font-size: 0.93rem; }

/* ---------------- now / contact ---------------- */

.now { border-top: 1px solid var(--line-soft); }

.now-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(20rem, 100%), 1fr));
  gap: 1.5rem;
}

.now-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.9rem;
}

.eyebrow-sm {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--accent);
}

.now-card h3 {
  font-family: var(--display);
  font-weight: 650;
  font-size: 1.4rem;
  letter-spacing: -0.015em;
}

.now-card p:not(.eyebrow-sm) { color: var(--muted); }
.now-card .btn { margin-top: auto; }

/* ---------------- footer ---------------- */

footer {
  border-top: 1px solid var(--line-soft);
  padding: 3.5rem var(--pad) 3rem;
  text-align: center;
}

.foot-name {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.foot-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
}
.foot-links a { color: var(--muted); text-decoration: none; }
.foot-links a:hover { color: var(--accent); }

.colophon { font-size: 0.7rem; color: var(--muted); opacity: 0.7; letter-spacing: 0.06em; }

/* ---------------- scroll reveal ---------------- */

@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.2, 0.7, 0.2, 1); }
  .reveal.revealed { opacity: 1; transform: none; }
}

/* ---------------- responsive ---------------- */

@media (max-width: 900px) {
  .earlier-list li { grid-template-columns: 6rem 1fr; }
  .earlier-list .stack { grid-column: 2; text-align: left; }
}

@media (max-width: 640px) {
  .wide-only { display: none; }
  .topnav a:not(.gh) { display: none; }
  .earlier-list li { grid-template-columns: 1fr; gap: 0.35rem; }
  .card-body { padding: 1.25rem 1.25rem 1.4rem; }
}