/* =========================================================
   Rohan Bandaru — personal site
   Editorial-minimal: warm paper, ink type, one vermillion accent.
   Shared by the homepage, project writeups, and the 404 page.
   ========================================================= */

:root {
  --paper:    #f4f1e9;   /* page background */
  --card:     #fbf9f3;   /* raised surfaces  */
  --ink:      #1b1916;   /* primary text     */
  --ink-soft: #6b655a;   /* secondary text   */
  --accent:   #d6492c;   /* the one accent   */
  --line:     rgba(27, 25, 22, 0.12);
  --code-bg:  rgba(27, 25, 22, 0.05);

  --font-serif: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono:  "Helvetica Neue", Helvetica, Arial, sans-serif;

  --wrap: 1040px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* Light theme only — dark text on a light background, regardless of OS setting. */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100svh;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  font-optical-sizing: auto;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* film grain atmosphere ------------------------------------------------ */
.grain {
  position: fixed;
  inset: -50%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.035;
  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");
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 2.75rem) clamp(1.25rem, 5vw, 2.5rem) clamp(3rem, 8vw, 5rem);
}

.accent { color: var(--accent); }

a { color: inherit; }

/* =========================================================
   Top navigation
   ========================================================= */
.topbar { display: flex; justify-content: flex-end; }

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(1.1rem, 3vw, 1.9rem);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: var(--ink);
  padding-bottom: 3px;
  transition: color 0.2s var(--ease);
}

.nav a:not(.icon)::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav a:hover { color: var(--accent); }
.nav a:not(.icon):hover::after,
.nav a:not(.icon):focus-visible::after { transform: scaleX(1); }

.nav .icon svg {
  width: 1.2rem; height: 1.2rem;
  display: block;
  fill: currentColor;
  transition: transform 0.2s var(--ease);
}
.nav .icon:hover svg { transform: translateY(-2px); }

/* =========================================================
   Hero
   ========================================================= */
.hero { margin-top: clamp(2.75rem, 11vh, 6rem); max-width: 40rem; }

.hero h1 {
  margin: 0;
  font-size: clamp(2.9rem, 10vw, 5.5rem);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: -0.025em;
}

.hero .tagline {
  margin: 0;
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  line-height: 1.45;
}
.hero .tagline.lead { margin-top: 1.6rem; color: var(--ink); }
.hero .tagline.sub  { margin-top: 0.35rem; color: var(--ink-soft); font-style: italic; }

/* =========================================================
   Projects
   ========================================================= */
.projects { margin-top: clamp(3.5rem, 13vh, 7rem); }

.projects h2 {
  margin: 0 0 1.75rem;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 500;
  letter-spacing: -0.015em;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 270px), 1fr));
  gap: clamp(1rem, 2vw, 1.4rem);
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.card:hover,
.card:focus-visible {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  box-shadow: 0 14px 30px -18px rgba(0, 0, 0, 0.45);
}

.thumb {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #fff;            /* white padding around uncropped thumbnails */
  border-bottom: 1px solid var(--line);
}
.thumb img {
  width: 100%; height: 100%;
  object-fit: contain;          /* shrink to fit, never crop */
  display: block;
}
.thumb.thumb-video { aspect-ratio: 16 / 9; }   /* matches the 16:9 clip, so it fills with no crop */
.thumb video {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.05rem 1.15rem 1.2rem;
  flex: 1;
}

.card-title {
  margin: 0;
  font-size: 1.18rem;
  font-weight: 500;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.card-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--ink-soft);
}

.card-go {
  margin-top: auto;
  padding-top: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease);
}
.card-go .arr { display: inline-block; transition: transform 0.25s var(--ease); }
.card:hover .card-go { color: var(--accent); }
.card:hover .card-go .arr { transform: translate(3px, -3px); }

/* =========================================================
   Friends
   ========================================================= */
.friends { margin-top: clamp(3rem, 10vh, 5rem); }

.friends h2 {
  margin: 0 0 1.25rem;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 500;
  letter-spacing: -0.015em;
}

.friend-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

.friend-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  text-decoration: none;
  color: var(--ink);
  padding-bottom: 2px;
  border-bottom: 1.5px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.friend-list a .arr { display: inline-block; transition: transform 0.25s var(--ease); }
.friend-list a:hover { color: var(--accent); border-color: var(--accent); }
.friend-list a:hover .arr { transform: translate(2px, -2px); }

/* =========================================================
   Footer
   ========================================================= */
.site-foot {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 1.75rem clamp(1.25rem, 5vw, 2.5rem) clamp(2rem, 5vw, 3rem);
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}
.site-foot .sep { opacity: 0.55; }
.site-foot .disclaimer { max-width: 46ch; }
.site-foot a { color: var(--ink); text-decoration: underline; text-underline-offset: 2px; transition: color 0.2s var(--ease); }
.site-foot a:hover { color: var(--accent); }

/* =========================================================
   Writeup pages — styled like rendered markdown
   ========================================================= */
.writeup .wrap { max-width: 46rem; }

.backlink {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease);
}
.backlink .arr { display: inline-block; transition: transform 0.25s var(--ease); }
.backlink:hover { color: var(--accent); }
.backlink:hover .arr { transform: translateX(-3px); }

.prose { margin-top: 2.5rem; }

.prose > * + * { margin-top: 1.25rem; }

.prose h1 {
  font-size: clamp(2.1rem, 6vw, 3rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}
.prose .post-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 2rem;
}
.prose h2 {
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-top: 2.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--line);
}
.prose h3 { font-size: 1.25rem; font-weight: 500; margin-top: 2rem; }

.prose p, .prose li { font-size: 1.075rem; line-height: 1.75; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li { margin-top: 0.4rem; }
.prose li::marker { color: var(--accent); }

.prose a {
  color: var(--accent);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1.2rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 5px;
}
.prose pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  line-height: 1.6;
}
.prose pre code { background: none; padding: 0; font-size: 0.85rem; }

.prose img { max-width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--line); }

.prose figure { margin: 1.9rem 0; }
.prose figure img { width: 100%; display: block; background: #fff; }
.prose figcaption {
  margin-top: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  text-align: center;
}

.prose hr { border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }

.prose table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.prose th, .prose td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--line); }
.prose th { font-family: var(--font-mono); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; }

/* =========================================================
   404
   ========================================================= */
.error .wrap { min-height: 70svh; display: flex; flex-direction: column; justify-content: center; }
.error h1 { font-size: clamp(3rem, 12vw, 6rem); font-weight: 500; letter-spacing: -0.025em; margin: 0.5rem 0 1rem; }
.error p { font-size: clamp(1.1rem, 2.5vw, 1.4rem); color: var(--ink-soft); margin: 0 0 2rem; max-width: 32rem; }
.error .label { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-soft); }

/* =========================================================
   Focus + entrance animation
   ========================================================= */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.reveal {
  opacity: 0;
  transform: translateY(14px);
  animation: rise 0.8s var(--ease) forwards;
  animation-delay: calc(var(--i, 0) * 0.07s + 0.05s);
}
@keyframes rise { to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { animation: none; opacity: 1; transform: none; }
  .card, .thumb img, .card-go .arr, .backlink .arr, .nav .icon svg { transition: none; }
}