/* =========================================================================
   "Instrument" — portfolio for Sai Krishna Podduturi
   Warm near-black control-panel aesthetic · Fraunces × JetBrains Mono
   ========================================================================= */

:root {
  --bg:        #0d0c0b;
  --bg-2:      #14110d;
  --ink:       #ece6da;
  --ink-dim:   #978f81;
  --ink-faint: #5f594f;
  --line:      #2a251d;
  --line-2:    #1c1813;
  --accent:    #ff6a1a;
  --accent-2:  #ffb070;
  --accent-soft: rgba(255, 106, 26, 0.12);

  --maxw: 1180px;
  --gutter: clamp(1.25rem, 5vw, 5rem);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-weight: 380;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: #1a0e05; }

a { color: inherit; text-decoration: none; }
em { font-style: italic; color: var(--accent-2); }

/* ───────────────────────── Atmosphere layers ───────────────────────── */
.grain {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.gridlines {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.5;
  background-image:
    linear-gradient(to right, var(--line-2) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-2) 1px, transparent 1px);
  background-size: clamp(60px, 8vw, 110px) clamp(60px, 8vw, 110px);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 25%, transparent 78%);
          mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 25%, transparent 78%);
}
.glow {
  position: fixed; top: -30vh; left: 50%; transform: translateX(-50%);
  width: 120vw; height: 80vh; z-index: 0; pointer-events: none;
  background: radial-gradient(50% 50% at 50% 50%, var(--accent-soft) 0%, transparent 70%);
  filter: blur(20px);
}

/* keep content above atmosphere */
.topbar, main, .footer { position: relative; z-index: 2; }

/* ───────────────────────── Skip link ───────────────────────── */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 50;
  background: var(--accent); color: #1a0e05; padding: .6rem 1rem; font-family: var(--mono);
}
.skip:focus { left: 1rem; top: 1rem; }

/* ───────────────────────── Header ───────────────────────── */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1.1rem var(--gutter);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px) saturate(120%);
}
.monogram {
  font-family: var(--mono); font-weight: 700; letter-spacing: 0.18em;
  font-size: 0.82rem; display: inline-flex; align-items: center;
}
.monogram .cursor { color: var(--accent); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.nav { display: flex; gap: clamp(0.8rem, 2vw, 2rem); font-family: var(--mono); font-size: 0.72rem; }
.nav a { color: var(--ink-dim); letter-spacing: 0.06em; padding: 0.2rem 0; position: relative; transition: color 0.3s var(--ease); }
.nav a i { color: var(--ink-faint); font-style: normal; margin-right: 0.35em; transition: color 0.3s var(--ease); }
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 1px; width: 0;
  background: var(--accent); transition: width 0.35s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a:hover i { color: var(--accent); }
.nav a:hover::after { width: 100%; }

.status { display: flex; align-items: center; gap: 0.6rem; font-family: var(--mono); font-size: 0.7rem; color: var(--ink-dim); }
.status .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 var(--accent); animation: pulse 2.4s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(255,106,26,.5); } 70% { box-shadow: 0 0 0 7px rgba(255,106,26,0); } 100% { box-shadow: 0 0 0 0 rgba(255,106,26,0); } }
.status .clock { padding-left: 0.6rem; border-left: 1px solid var(--line); color: var(--ink-faint); }
@media (max-width: 760px) { .nav { display: none; } .status-txt { display: none; } }

/* ───────────────────────── Layout helpers ───────────────────────── */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

/* keep anchored sections clear of the sticky header */
.hero, .block { scroll-margin-top: 4.75rem; }

.block { display: grid; grid-template-columns: minmax(120px, 1fr) minmax(0, 3.4fr); gap: clamp(1.5rem, 5vw, 5rem); padding: clamp(3.5rem, 9vw, 7rem) 0; border-top: 1px solid var(--line); }
.block-label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--ink-dim); display: flex; flex-direction: column; gap: 0.4rem; position: sticky; top: 6rem; align-self: start; height: fit-content; }
.block-label i { color: var(--accent); font-style: normal; font-weight: 700; }
.block-label span { text-transform: uppercase; }
@media (max-width: 760px) { .block { grid-template-columns: 1fr; gap: 1.2rem; } .block-label { position: static; flex-direction: row; gap: 0.6rem; } }

/* ───────────────────────── Hero ───────────────────────── */
.hero { padding: clamp(3.5rem, 11vw, 9rem) 0 clamp(2rem, 6vw, 4rem); }
.kicker { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.1em; color: var(--ink-dim); text-transform: uppercase; margin: 0 0 1.6rem; }
.name {
  font-family: var(--serif); font-weight: 560; font-size: clamp(3rem, 13vw, 9.5rem);
  line-height: 0.92; letter-spacing: -0.02em; margin: 0; text-wrap: balance;
}
.name span { display: block; }
.accentline { color: var(--accent); }
.lede {
  font-size: clamp(1.15rem, 2.4vw, 1.7rem); line-height: 1.45; max-width: 30ch;
  margin: clamp(1.8rem, 4vw, 3rem) 0 0; color: var(--ink); font-weight: 360;
}
.hero-meta { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 2.4rem; }

.btn {
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.04em;
  padding: 0.85rem 1.4rem; border: 1px solid var(--accent); color: #1a0e05;
  background: var(--accent); transition: transform 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
}
.btn:hover { transform: translateY(-2px); background: var(--accent-2); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ───────────────────────── Marquee ───────────────────────── */
.marquee { overflow: hidden; border-block: 1px solid var(--line); padding: 0.9rem 0; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee-track { display: inline-flex; gap: 1.6rem; white-space: nowrap; font-family: var(--mono); font-size: 0.85rem; color: var(--ink-dim); letter-spacing: 0.05em; animation: scroll 28s linear infinite; will-change: transform; }
.marquee-track span:nth-child(even) { color: var(--accent); }
@keyframes scroll { to { transform: translateX(-50%); } }
.marquee:hover .marquee-track { animation-play-state: paused; }

/* ───────────────────────── Prose / Profile ───────────────────────── */
.prose p { margin: 0 0 1.3rem; max-width: 60ch; color: var(--ink-dim); font-size: 1.05rem; }
.prose .big { font-size: clamp(1.3rem, 2.6vw, 1.9rem); line-height: 1.4; color: var(--ink); font-weight: 360; max-width: 26ch; }
.prose strong { color: var(--ink); font-weight: 560; }

/* ───────────────────────── Projects ───────────────────────── */
.projects { list-style: none; margin: 0; padding: 0; }
.project { border-top: 1px solid var(--line); }
.project:last-child { border-bottom: 1px solid var(--line); }
.project-link { display: grid; grid-template-columns: auto 1fr auto; gap: clamp(1rem, 3vw, 2.4rem); align-items: start; padding: clamp(1.6rem, 3vw, 2.4rem) 0; transition: padding-left 0.4s var(--ease); }
.project-link:hover { padding-left: clamp(0.4rem, 1.5vw, 1.2rem); }
.p-index { font-family: var(--mono); font-size: 0.78rem; color: var(--ink-faint); padding-top: 0.5rem; transition: color 0.35s var(--ease); }
.project-link:hover .p-index { color: var(--accent); }
.p-title { font-family: var(--serif); font-weight: 520; font-size: clamp(1.5rem, 3.6vw, 2.6rem); line-height: 1.05; margin: 0 0 0.7rem; letter-spacing: -0.01em; }
.p-year { font-family: var(--mono); font-size: 0.7rem; color: var(--ink-faint); letter-spacing: 0.08em; vertical-align: middle; margin-left: 0.6rem; font-weight: 400; }
.p-desc { margin: 0 0 1rem; color: var(--ink-dim); max-width: 58ch; font-size: 1.02rem; }
.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; list-style: none; margin: 0; padding: 0; }
.tags li { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.03em; color: var(--ink-dim); border: 1px solid var(--line); padding: 0.28rem 0.6rem; border-radius: 2px; transition: border-color 0.35s var(--ease), color 0.35s var(--ease); }
.project-link:hover .tags li { border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }
.p-arrow { font-family: var(--mono); font-size: 1.3rem; color: var(--ink-faint); padding-top: 0.4rem; transition: transform 0.4s var(--ease), color 0.35s var(--ease); }
.project-link:hover .p-arrow { color: var(--accent); transform: translate(4px, -4px); }
.project.is-empty { opacity: 0.5; }
.project.is-empty .p-main { display: grid; grid-template-columns: auto 1fr; gap: 2rem; padding: clamp(1.6rem,3vw,2.4rem) 0; align-items: baseline; }
.project.is-empty { display: grid; grid-template-columns: auto 1fr; gap: clamp(1rem,3vw,2.4rem); padding-left: 0; }
.project.is-empty .p-index { padding-top: 0.4rem; }
.project.is-empty .p-title { font-size: clamp(1.3rem,3vw,1.9rem); }

/* ───────────────────────── Stack / spec ───────────────────────── */
.spec { margin: 0; }
.spec-row { display: grid; grid-template-columns: minmax(120px, 0.5fr) 2fr; gap: 1.5rem; padding: 1.1rem 0; border-top: 1px solid var(--line-2); align-items: baseline; }
.spec-row:first-child { border-top: none; }
.spec dt { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }
.spec dd { margin: 0; color: var(--ink); font-size: 1.08rem; line-height: 1.6; }
.hint, .l-val .hint { font-family: var(--mono); font-size: 0.66rem; color: var(--ink-faint); opacity: 0.7; }

/* ───────────────────────── Contact ───────────────────────── */
.contact-h { font-family: var(--serif); font-weight: 520; font-size: clamp(2rem, 6vw, 4.2rem); line-height: 1.02; letter-spacing: -0.02em; margin: 0 0 2.6rem; }
.links { list-style: none; margin: 0; padding: 0; }
.links li { border-top: 1px solid var(--line); }
.links li:last-child { border-bottom: 1px solid var(--line); }
.links a { display: flex; align-items: baseline; gap: 1.5rem; padding: 1.15rem 0.2rem; transition: padding-left 0.35s var(--ease), background 0.35s var(--ease); }
.links a:hover { padding-left: 1rem; background: linear-gradient(90deg, var(--accent-soft), transparent); }
.l-key { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-dim); width: 5.5rem; flex-shrink: 0; }
.l-val { font-size: clamp(1.1rem, 2.6vw, 1.6rem); color: var(--ink); }
.links a:hover .l-val { color: var(--accent); }

/* ───────────────────────── Footer ───────────────────────── */
.footer { max-width: var(--maxw); margin: 0 auto; padding: 2rem var(--gutter) 3rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.6rem; border-top: 1px solid var(--line); font-family: var(--mono); font-size: 0.7rem; color: var(--ink-faint); letter-spacing: 0.04em; }

/* ───────────────────────── Reveal animation ───────────────────────── */
.reveal { opacity: 0; transform: translateY(18px); animation: rise 0.9s var(--ease) forwards; animation-delay: var(--d, 0ms); }
@keyframes rise { to { opacity: 1; transform: none; } }

.in-view { opacity: 0; transform: translateY(24px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.in-view.shown { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal, .in-view { opacity: 1 !important; transform: none !important; animation: none !important; transition: none !important; }
  .marquee-track, .status .dot, .cursor { animation: none !important; }
}