/* ==========================================================================
   Suhasini Vempati — Portfolio styles
   Inspired by marcosrezende.com — minimal, editorial, generous whitespace.
   ========================================================================== */

:root {
  /* palette — aligned to Suhasini's DS (file HveIGBJP0aHE8VaqUTtKnK) */
  --text-primary: #312234;                            /* DS: text/primary */
  --text-secondary: #5e5261;                          /* DS: text/secondary */
  --text-tertiary: #736b78;                           /* between DS secondary and disabled — AA 5.12:1 on white */
  --text-disabled: #b0a8b3;                           /* DS: text/disabled */
  --surface: #ffffff;                                 /* DS: surface/default */
  --surface-subtle: #f7f5f8;                          /* DS: surface/subtle */
  --surface-muted: #edeaef;                           /* DS: surface/muted */
  --surface-mint: #e8f8f8;                            /* DS: accent/mint */
  --surface-lilac: #f2e7ff;                           /* DS: accent/lilac */
  --border: #d4cfd6;                                  /* DS: border/default */
  --border-strong: #5e5261;                           /* DS: border/strong */
  --accent: #ff5500;                                  /* DS: brand/primary + interactive/default */
  --accent-hover: #cc4400;                            /* DS: interactive/hover */
  --accent-text: #c84500;                             /* AA 4.71:1 on white for small text */

  --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-serif: 'Libre Baskerville', Georgia, 'Times New Roman', serif;

  --max-w: 1200px;
  --gutter: 48px;
}

/* OKLCH override for modern browsers — perceptually uniform */
@supports (color: oklch(0 0 0)) {
  :root {
    --text-primary: oklch(0.278 0.039 321);
    --text-secondary: oklch(0.456 0.028 319);
    --text-tertiary: oklch(0.537 0.022 318);
    --text-disabled: oklch(0.742 0.018 317);
    --surface: oklch(1 0 none);
    --surface-subtle: oklch(0.973 0.005 315);
    --surface-muted: oklch(0.941 0.007 312);
    --surface-mint: oklch(0.967 0.017 197);
    --surface-lilac: oklch(0.944 0.034 306);
    --border: oklch(0.861 0.011 316);
    --border-strong: oklch(0.456 0.028 319);
    --accent: oklch(0.676 0.218 39);
    --accent-hover: oklch(0.573 0.182 39);
    --accent-text: oklch(0.568 0.178 40);
  }
}

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

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

/* Accessibility — explicit focus indicators for WCAG 2.4.7 (AA) and 2.4.11 (AAA / WCAG 2.2 AA) */
*:focus { outline: none; }
*:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--surface);
  font-weight: 400;
}

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

.narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

section {
  padding: 120px 0;
}

section.tight { padding: 80px 0; }

/* -------- nav ---------- */
header.site-nav {
  position: sticky;
  top: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
header.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  text-decoration: none;
}
.brand:hover { color: var(--accent); }

nav ul { list-style: none; display: flex; gap: 40px; }
nav a {
  font-size: 16px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
nav a:hover { color: var(--text-primary); }

/* -------- type ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-primary);
}

h1.hero {
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.02;
  font-weight: 300;
  margin-bottom: 32px;
  letter-spacing: -0.035em;
}

h1.page { font-size: clamp(40px, 6vw, 72px); margin-bottom: 24px; }
h2 { font-size: clamp(32px, 4vw, 48px); margin-bottom: 24px; }
h3 { font-size: 24px; margin-bottom: 16px; }
h4 { font-size: 16px; font-family: var(--font-sans); font-weight: 600; margin-bottom: 8px; letter-spacing: 0; }

p { margin-bottom: 24px; max-width: 64ch; }
p.lede {
  font-size: 20px;
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 52ch;
  font-weight: 400;
  font-family: var(--font-serif);
  font-style: italic;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-text);
  margin-bottom: 16px;
  display: block;
}

strong { font-weight: 600; color: var(--text-primary); }
em { font-style: italic; }
a.inline { color: var(--text-primary); text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 4px; text-decoration-thickness: 1px; }

ul.plain { list-style: none; }
ul.bulleted { margin-left: 24px; margin-bottom: 24px; }
ul.bulleted li { margin-bottom: 12px; }

/* -------- hero ---------- */
.hero-block {
  padding: 160px 0 64px;
}
.hero-block .sub {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 620px;
  font-weight: 300;
}
.meta-strip {
  margin-top: 80px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}
.meta-strip .item small {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  color: var(--text-tertiary);
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}
.meta-strip .item p { margin: 0; font-size: 16px; color: var(--text-primary); }

/* -------- work list ---------- */
.work-list { display: flex; flex-direction: column; gap: 96px; }
.project {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: center;
}
.project.reversed { grid-template-columns: 1.2fr 1fr; }
.project.reversed .project-copy { order: 2; }
.project.reversed .project-visual { order: 1; }

.project-visual {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 16px;
}
.project-visual img {
  height: 320px;
  width: auto;
  border-radius: 12px;
  box-shadow: 0 4px 16px oklch(0 0 0 / 0.12);
}
.project-visual .placeholder {
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
}

.project-copy .label {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}
.project-copy h3 {
  font-size: 32px;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.project-copy p {
  font-size: 16px;  /* body size — project card descriptions */
  color: var(--text-secondary);
  margin-bottom: 32px;
}
.project-copy .stats {
  display: flex;
  gap: 40px;
  margin-bottom: 32px;
}
.project-copy .stats .stat strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 4px;
}
.project-copy .stats .stat small {
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.link-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  border-bottom: 1px solid var(--text-primary);
  padding-bottom: 2px;
  transition: all 0.2s;
}
.link-cta:hover { color: var(--accent); border-bottom-color: var(--accent); }
.link-cta::after { content: " →"; }

/* -------- about ---------- */
.about {
  background: var(--surface-subtle);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.about .container {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 96px;
}
.about-copy p { font-size: 20px; color: var(--text-secondary); }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 48px;
}
.two-col h4 { margin-bottom: 16px; color: var(--text-primary); }
.two-col ul { list-style: none; }
.two-col li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 16px;
}
.two-col li:last-child { border: 0; }
.two-col li strong {
  display: block;
  color: var(--text-primary);
  font-size: 16px;
  margin-bottom: 2px;
}

/* -------- case study article ---------- */
article {
  padding: 80px 0 120px;
}
article .narrow > * + * { margin-top: 24px; }
article h1 { margin-top: 0; }
article .lede { margin-bottom: 56px; }
article h2 { margin-top: 80px; }
article h3 { margin-top: 48px; color: var(--text-primary); }
article p { color: var(--text-secondary); font-size: 20px; max-width: none; }
article blockquote {
  padding: 0 0 0 32px;
  margin: 40px 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 24px;
  line-height: 1.35;
  color: var(--text-primary);
  max-width: 52ch;
}
article ul { list-style: none; padding: 0; }
article ul li {
  padding-left: 28px;
  position: relative;
  margin-bottom: 12px;
  color: var(--text-secondary);
  font-size: 20px;
}
article ul li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  position: absolute;
  left: 8px;
  top: 13px;
}

.callout {
  background: var(--surface-mint);
  border-radius: 12px;
  padding: 32px 40px;
  margin: 48px 0;
}
.callout.lilac { background: var(--surface-lilac); }
.callout.subtle { background: var(--surface-subtle); border: 1px solid var(--border); }
.callout h3 { margin-top: 0; color: var(--text-primary); font-family: var(--font-serif); }
.callout p:last-child { margin-bottom: 0; }

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 48px 0;
}
.metric {
  padding: 40px 32px;
  background: var(--surface-subtle);
  border-radius: 16px;
  border: 1px solid var(--border);
}
.metric .num {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 300;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}
.metric .label { font-weight: 600; color: var(--text-primary); margin-bottom: 4px; font-size: 16px; }
.metric .blurb { font-size: 16px; color: var(--text-secondary); margin: 0; }  /* body size, not article */

table.compare {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 16px;
}
table.compare th, table.compare td {
  padding: 20px 24px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}
table.compare th {
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 16px;
  color: var(--text-tertiary);
  background: var(--surface-subtle);
}
table.compare td.winner { background: #eafbef; }
table.compare td.winner strong { color: #15803d; }   /* AA on bg: 4.71:1 (was #16a34a, 3.03:1) */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 16px;
  margin-bottom: 40px;
  transition: color 0.2s;
}
.back-link::before { content: "← "; }
.back-link:hover { color: var(--text-primary); }

/* -------- footer ---------- */
footer {
  padding: 80px 0 40px;
  border-top: 1px solid var(--border);
  background: var(--surface-subtle);
}
footer .container {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 48px;
  flex-wrap: wrap;
}
footer h3 {
  font-size: 40px;
  margin: 0;
  max-width: 520px;
}
footer .links { display: flex; flex-direction: column; gap: 12px; text-align: right; }
footer a { color: var(--text-primary); text-decoration: none; font-size: 16px; }
footer a:hover { color: var(--accent); }
footer small { color: var(--text-tertiary); font-size: 12px; margin-top: 32px; display: block; }

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

/* tablet + small laptop */
@media (max-width: 900px) {
  :root { --gutter: 28px; }
  section { padding: 80px 0; }
  .hero-block { padding: 100px 0 80px; }
  .meta-strip { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .project, .project.reversed { grid-template-columns: 1fr; gap: 32px; }
  .project.reversed .project-copy { order: 1; }
  .project.reversed .project-visual { order: 0; }
  .about .container { grid-template-columns: 1fr; gap: 48px; }
  .two-col { grid-template-columns: 1fr; gap: 32px; }
  .metric-row { grid-template-columns: 1fr; }
  h1.hero { font-size: 56px; }
  nav ul { gap: 24px; }
  .project-copy .stats { flex-wrap: wrap; gap: 24px; }
  .project-visual img { height: 240px; }
  footer h3 { font-size: 28px; }
}

/* phone */
@media (max-width: 480px) {
  :root { --gutter: 20px; }
  .hero-block { padding: 80px 0 64px; }
  h1.hero { font-size: 40px; letter-spacing: -0.02em; }
  h1.page { font-size: 32px; }
  h2 { font-size: 24px; }
  .project-copy h3 { font-size: 24px; }
  .project-visual img { height: 180px; }
  .meta-strip { grid-template-columns: 1fr 1fr; gap: 16px; }
  .project-copy .stats { flex-direction: column; gap: 16px; }
  .callout { padding: 24px; }
  footer h3 { font-size: 24px; }
  footer .container { flex-direction: column; align-items: flex-start; gap: 32px; }
  footer .links { text-align: left; }
  header.site-nav .container { height: 56px; }
  .brand { font-size: 16px; }
  nav a { font-size: 16px; }
  article p, article ul li { font-size: 16px; }
  nav ul { gap: 16px; }
  article blockquote { font-size: 20px; padding-left: 20px; }
  .metric .num { font-size: 40px; }
  table.compare { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
}