/* ==========================================================================
   Harsha Shanthanna — Personal Site
   Design tokens: paper/sage/deep-teal/brass, Newsreader + IBM Plex
   ========================================================================== */

:root {
  /* Color */
  --paper: #eff1ec;
  --paper-alt: #e6eae2;
  --card: #f7f8f4;
  --ink: #14201c;
  --ink-soft: #45534c;
  --ink-faint: #6f7d75;
  --deep: #1a3432;
  --deep-2: #102422;
  --deep-text: #eef3ee;
  --deep-text-soft: #b7c8c0;
  --sage: #6f8f78;
  --sage-deep: #4f6e5a;
  --brass: #a9812f;
  --brass-light: #c79f47;
  --mist: #d4dbd2;
  --line: rgba(20, 32, 28, 0.12);
  --line-deep: rgba(238, 243, 238, 0.16);

  /* Type */
  --font-display: "Newsreader", "Iowan Old Style", Georgia, serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Layout */
  --container: 1180px;
  --gutter: clamp(1.5rem, 4vw, 3.5rem);
  --radius: 2px;

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 500; }
p { margin: 0; }
button { font: inherit; background: none; border: none; cursor: pointer; color: inherit; }
::selection { background: var(--sage); color: var(--deep-2); }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---- Utility ---- */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sage-deep);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--brass);
  display: inline-block;
}
.on-deep .eyebrow { color: var(--deep-text-soft); }
.on-deep .eyebrow::before { background: var(--brass-light); }

.section {
  padding: clamp(4rem, 9vw, 7.5rem) 0;
}
.section-deep {
  background: linear-gradient(175deg, var(--deep) 0%, var(--deep-2) 100%);
  color: var(--deep-text);
}
.section-alt { background: var(--paper-alt); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.3s var(--ease), gap 0.3s var(--ease);
}
.btn:hover { border-color: var(--brass); gap: 0.85rem; }
.on-deep .btn { border-color: var(--line-deep); }
.on-deep .btn:hover { border-color: var(--brass-light); }
.btn-arrow { transition: transform 0.3s var(--ease); }
.btn:hover .btn-arrow { transform: translateX(2px); }

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > * { opacity: 1; transform: translateY(0); }
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0.02s; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 0.18s; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 0.26s; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 0.34s; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 0.42s; }

/* ---- Calm line motif ---- */
.calm-line { width: 100%; height: auto; display: block; }
.calm-line path {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.1;
  stroke-linecap: round;
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  transition: stroke-dashoffset 2.4s var(--ease);
}
.calm-line.is-visible path { stroke-dashoffset: 0; }
.divider-line { color: var(--mist); margin: 0 auto; max-width: 480px; opacity: 0.9; }
.on-deep .divider-line { color: var(--line-deep); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1.5rem 0;
  color: var(--deep-text);
  transition: background 0.4s var(--ease), padding 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color .4s var(--ease), color 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(239, 241, 236, 0.92);
  backdrop-filter: blur(10px);
  padding: 1rem 0;
  border-color: var(--line);
  color: var(--ink);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.wordmark {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.2rem;
  letter-spacing: 0.01em;
  color: inherit;
}
.site-nav {
  display: flex;
  gap: clamp(1.1rem, 2vw, 2rem);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  font-weight: 500;
}
.site-nav a {
  position: relative;
  padding: 0.2rem 0;
  opacity: 0.82;
  transition: opacity 0.25s var(--ease);
}
.site-nav a::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: -3px;
  height: 1px; background: currentColor;
  transition: right 0.3s var(--ease);
}
.site-nav a:hover { opacity: 1; }
.site-nav a:hover::after, .site-nav a.is-active::after { right: 0; }
.site-nav a.is-active { opacity: 1; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  z-index: 110;
}
.nav-toggle span {
  width: 22px; height: 1px; background: currentColor;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 820px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed;
    inset: 0;
    background: var(--deep);
    color: var(--deep-text);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 0 2.2rem;
    gap: 1.4rem;
    font-family: var(--font-display);
    font-size: 1.7rem;
    font-style: italic;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.45s var(--ease), opacity 0.4s var(--ease), visibility 0.45s;
  }
  .site-nav.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  background: linear-gradient(160deg, var(--deep) 0%, var(--deep-2) 65%, #0c1d1b 100%);
  color: var(--deep-text);
  overflow: hidden;
  padding-top: 8rem;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(ellipse at 82% 12%, rgba(111, 143, 120, 0.28), transparent 55%),
    radial-gradient(ellipse at 12% 88%, rgba(169, 129, 47, 0.14), transparent 50%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter) 5.5rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: end;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--deep-text-soft);
  margin-bottom: 1.6rem;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(3rem, 8vw, 6.4rem);
  line-height: 0.98;
  letter-spacing: -0.01em;
}
.hero-title em {
  font-style: italic;
  color: var(--sage);
}
.hero-line { color: var(--sage); width: min(420px, 60vw); margin: 1.8rem 0; }
.hero-sub {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  max-width: 46ch;
  color: var(--deep-text-soft);
  font-weight: 300;
}
.hero-actions {
  display: flex;
  gap: 2rem;
  margin-top: 2.6rem;
  flex-wrap: wrap;
}
.hero-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--deep-text-soft);
  text-align: right;
  padding-bottom: 0.3rem;
}
.hero-side strong { display: block; color: var(--deep-text); font-size: 1.05rem; font-family: var(--font-body); font-weight: 600; }
.scroll-cue {
  position: absolute;
  bottom: 2rem; left: var(--gutter);
  display: flex; align-items: center; gap: 0.7rem;
  font-family: var(--font-mono); font-size: 0.68rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--deep-text-soft);
}
.scroll-cue .line { width: 30px; height: 1px; background: var(--deep-text-soft); position: relative; overflow: hidden; }
.scroll-cue .line::after {
  content: ""; position: absolute; left: -100%; top: 0; bottom: 0; width: 100%;
  background: var(--brass-light);
  animation: cueMove 2.6s var(--ease) infinite;
}
@keyframes cueMove { 0% { left: -100%; } 60%, 100% { left: 100%; } }

@media (max-width: 820px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-side { align-items: flex-start; text-align: left; flex-direction: row; flex-wrap: wrap; gap: 1.4rem 2rem; }
}

/* ==========================================================================
   Page header (inner pages)
   ========================================================================== */
.page-hero {
  background: linear-gradient(165deg, var(--deep) 0%, var(--deep-2) 100%);
  color: var(--deep-text);
  padding: 10.5rem 0 5rem;
}
.page-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.04;
  max-width: 16ch;
  margin-top: 1.2rem;
}
.page-hero-title em { color: var(--sage); font-style: italic; }
.page-hero-sub {
  margin-top: 1.4rem;
  max-width: 58ch;
  color: var(--deep-text-soft);
  font-size: 1.08rem;
  font-weight: 300;
}
.page-hero-line { color: var(--sage); width: min(360px, 50vw); margin-top: 2rem; }

/* On-page index */
.page-index {
  display: flex;
  gap: clamp(1.2rem, 3vw, 2.4rem);
  flex-wrap: wrap;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.page-index a { transition: color 0.25s var(--ease); }
.page-index a:hover { color: var(--sage-deep); }
.page-index span { color: var(--brass); margin-right: 0.4rem; }

/* ==========================================================================
   Section heading pattern (label col + content col)
   ========================================================================== */
.head-grid {
  display: grid;
  grid-template-columns: minmax(160px, 0.7fr) 2.2fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  margin-bottom: clamp(2.4rem, 5vw, 3.6rem);
}
@media (max-width: 760px) { .head-grid { grid-template-columns: 1fr; gap: 1rem; } }
.head-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
  line-height: 1.15;
}
.head-title em { font-style: italic; color: var(--sage-deep); }
.on-deep .head-title em { color: var(--sage); }
.head-body { margin-top: 1rem; max-width: 62ch; color: var(--ink-soft); }
.on-deep .head-body { color: var(--deep-text-soft); }

/* ==========================================================================
   Cards & lists
   ========================================================================== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }
@media (max-width: 900px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 2rem;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.card:hover { border-color: var(--sage); transform: translateY(-3px); }
.card-index { font-family: var(--font-mono); font-size: 0.72rem; color: var(--brass); letter-spacing: 0.08em; }
.card-title { font-family: var(--font-display); font-size: 1.35rem; margin-top: 0.7rem; }
.card-body { margin-top: 0.7rem; color: var(--ink-soft); font-size: 0.96rem; }

.pub-list { border-top: 1px solid var(--line); }
.on-deep .pub-list { border-color: var(--line-deep); }
.pub-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}
.on-deep .pub-item { border-color: var(--line-deep); }
.pub-title { font-family: var(--font-display); font-size: 1.18rem; line-height: 1.4; }
.pub-meta { margin-top: 0.5rem; font-size: 0.88rem; color: var(--ink-faint); }
.on-deep .pub-meta { color: var(--deep-text-soft); }
.pub-meta em { font-style: italic; }
.pub-stat { font-family: var(--font-mono); font-size: 0.82rem; color: var(--brass); white-space: nowrap; text-align: right; }
.pub-stat span { display: block; color: var(--ink-faint); font-size: 0.68rem; letter-spacing: 0.05em; text-transform: uppercase; margin-top: 0.2rem; }
.on-deep .pub-stat span { color: var(--deep-text-soft); }
@media (max-width: 640px) { .pub-item { grid-template-columns: 1fr; } .pub-stat { text-align: left; } }

/* Tags */
.tag-row { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.4rem; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--line);
  color: var(--ink-soft);
}
.on-deep .tag { border-color: var(--line-deep); color: var(--deep-text-soft); }

/* Stats band */
.stats-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; text-align: left; }
@media (max-width: 760px) { .stats-band { grid-template-columns: repeat(2, 1fr); } }
.stat-num { font-family: var(--font-display); font-size: clamp(2.2rem, 4vw, 3.2rem); color: var(--deep-text); }
.stat-num .u { font-family: var(--font-mono); font-size: 1.1rem; color: var(--brass-light); margin-left: 0.15rem; }
.stat-label { margin-top: 0.5rem; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--deep-text-soft); }

/* Timeline (credentials / process) */
.timeline { border-top: 1px solid var(--line); }
.timeline-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.6rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 640px) { .timeline-item { grid-template-columns: 1fr; gap: 0.4rem; } }
.timeline-year { font-family: var(--font-mono); font-size: 0.82rem; color: var(--brass); padding-top: 0.2rem; }
.timeline-title { font-family: var(--font-display); font-size: 1.15rem; }
.timeline-body { margin-top: 0.4rem; color: var(--ink-soft); font-size: 0.94rem; }

/* Portrait plate */
.portrait {
  position: relative;
  aspect-ratio: 4 / 5;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 14px;
  box-shadow: 0 18px 40px -22px rgba(20, 32, 28, 0.35);
}
.portrait-frame {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border: 1px solid var(--mist);
}
.portrait-frame::after {
  content: "";
  position: absolute; inset: 0;
  box-shadow: inset 0 0 0 1px rgba(20, 32, 28, 0.06);
  pointer-events: none;
}
.portrait-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 18%;
  filter: saturate(0.94) contrast(1.02);
}
.portrait-mono {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 5rem;
  color: rgba(238,243,238,0.85);
  position: relative;
  letter-spacing: -0.02em;
}
.portrait-caption {
  margin-top: 1rem;
  padding-left: 2px;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.05em;
  color: var(--ink-faint); text-transform: uppercase;
}
.portrait-caption strong { color: var(--ink-soft); font-style: normal; }

/* Pull quote */
.pull-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  line-height: 1.5;
  color: var(--ink);
  max-width: 42ch;
}
.on-deep .pull-quote { color: var(--deep-text); }
.pull-quote-cite { margin-top: 1rem; font-family: var(--font-mono); font-size: 0.76rem; color: var(--ink-faint); font-style: normal; }

/* Musings */
.essay-card { padding: 2.4rem 0; border-bottom: 1px solid var(--line); }
.essay-date { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--brass); }
.essay-title { font-family: var(--font-display); font-size: clamp(1.5rem, 2.6vw, 2.1rem); margin-top: 0.6rem; max-width: 26ch; }
.essay-excerpt { margin-top: 0.9rem; max-width: 68ch; color: var(--ink-soft); }

/* Simple 2-col content layout */
.split {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }

/* Note / placeholder marker (subtle, editorial, not a "TODO" banner) */
.note {
  margin-top: 2rem;
  padding: 1.1rem 1.3rem;
  border-left: 2px solid var(--brass);
  background: rgba(169, 129, 47, 0.06);
  font-size: 0.92rem;
  color: var(--ink-soft);
}

/* Link list (associations page) */
.link-list { border-top: 1px solid var(--line); }
.link-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.3s var(--ease);
}
.link-item:hover { padding-left: 0.6rem; }
.link-name { font-family: var(--font-display); font-size: 1.15rem; }
.link-role { margin-top: 0.35rem; font-size: 0.88rem; color: var(--ink-faint); }
.link-go { font-family: var(--font-mono); font-size: 0.75rem; color: var(--sage-deep); white-space: nowrap; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--deep-2);
  color: var(--deep-text-soft);
  padding: 4.5rem 0 2rem;
}
.footer-line { color: var(--sage); margin-bottom: 3rem; max-width: 100%; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
}
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr; gap: 2rem; } }
.footer-name { font-family: var(--font-display); font-style: italic; font-size: 1.3rem; color: var(--deep-text); }
.footer-role { margin-top: 0.8rem; font-size: 0.88rem; line-height: 1.7; }
.footer-heading { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--brass-light); margin-bottom: 1rem; }
.footer-links, .footer-connect { display: flex; flex-direction: column; }
.footer-links a, .footer-connect a { padding: 0.35rem 0; font-size: 0.92rem; transition: color 0.25s var(--ease); width: fit-content; }
.footer-links a:hover, .footer-connect a:hover { color: var(--deep-text); }
.footer-bottom {
  margin-top: 3.5rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line-deep);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--deep-text-soft);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* Focus visibility */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}