/* ============================================================
   Sakib Mostafa — portfolio
   Direction A ("Quiet Scholar"), ported verbatim from
   portfolio-a.jsx (aTokens + AStyle + lifted inline styles).
   No build step. Shared by all 6 pages.
   Responsive breakpoints: 900 / 700 / 600px (per README).
   ============================================================ */

:root {
  --bg: #fafaf7;
  --panel: #ffffff;
  --ink: #15151a;
  --ink-soft: #4a4a52;
  --ink-mute: #8a8a92;
  --line: #e6e4dc;
  --accent: #8c1515;        /* Stanford cardinal */
  --accent-soft: #f4e9e9;
  --edge-teal: #4e8a8c;     /* Aperture interpretable edge */
  --node-gold: #b9883c;     /* Aperture focal node */
  --font: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, monospace;
}

/* ---- Base / reset (from AStyle) ---- */
.a-root { font-family: var(--font); color: var(--ink); background: var(--bg); }
.a-root *, .a-root *::before, .a-root *::after { box-sizing: border-box; }
.a-root p { margin: 0; }
.a-root h1, .a-root h2, .a-root h3, .a-root h4 { margin: 0; font-weight: 600; letter-spacing: -0.02em; }
.a-root a { color: inherit; text-decoration: none; }
.a-root ::selection { background: var(--accent-soft); color: var(--accent); }

html, body { margin: 0; padding: 0; background: var(--bg); }

/* ---- Shared component classes (from AStyle) ---- */
.a-hat-wrap { position: absolute; right: 88px; top: 96px; width: 280px; height: 280px; pointer-events: none; }
.a-logo-mark { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; }

.a-link-underline { background-image: linear-gradient(var(--ink), var(--ink)); background-size: 100% 1px; background-repeat: no-repeat; background-position: 0 100%; padding-bottom: 2px; }
.a-link-underline--soft { color: var(--ink-soft); }
.a-link-accent { color: var(--accent); background-image: linear-gradient(var(--accent), var(--accent)); background-size: 100% 1px; background-repeat: no-repeat; background-position: 0 100%; padding-bottom: 2px; }

.a-card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; }
.a-chip { display: inline-flex; align-items: center; gap: 8px; padding: 4px 10px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: 12px; font-weight: 500; letter-spacing: 0.02em; }
.a-tag { display: inline-flex; align-items: center; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line); font-size: 11.5px; color: var(--ink-soft); }
.a-tag--sm { font-size: 11px; }

.a-rule { height: 1px; background: var(--line); }
.a-section-label { font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-mute); font-weight: 500; }

/* ---- Spacing / width utilities ---- */
.mt-18 { margin-top: 18px; }
.mt-36 { margin-top: 36px; }
.mt-56 { margin-top: 56px; }
.mw-480 { max-width: 480px; }
.mw-520 { max-width: 520px; }
.mw-620 { max-width: 620px; }
.mw-640 { max-width: 640px; }
.mw-760 { max-width: 760px; }
.mw-820 { max-width: 820px; }

/* ---- Frame: page / nav / footer ---- */
.page { min-height: 900px; display: flex; flex-direction: column; }
.page-body { flex: 1; }

.nav { display: flex; align-items: center; justify-content: space-between; padding: 26px 88px; border-bottom: 1px solid var(--line); }
.nav-brand { display: flex; align-items: center; gap: 12px; }
.nav-brand-name { font-weight: 600; font-size: 16px; letter-spacing: -0.01em; }
.nav-brand-sub { color: var(--ink-mute); font-size: 13px; margin-left: 2px; }
.nav-links { display: flex; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav-link { font-size: 14px; color: var(--ink-soft); font-weight: 400; border-bottom: 1.5px solid transparent; padding-bottom: 4px; }
.nav-link.is-active { color: var(--ink); font-weight: 600; border-bottom: 1.5px solid var(--accent); }

.footer { padding: 32px 88px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--ink-mute); }
.footer-links { display: flex; gap: 22px; }

/* ---- Sections / headings ---- */
.section { padding: 72px 88px 96px; }
.section--home { padding: 104px 88px 96px; position: relative; }

.h1-hero { font-size: 64px; line-height: 1.04; letter-spacing: -0.035em; }
.h1-page { margin-top: 14px; font-size: 44px; line-height: 1.08; letter-spacing: -0.03em; }
.lede { margin-top: 18px; font-size: 22px; line-height: 1.45; color: var(--ink-soft); max-width: 620px; }
.bio { margin-top: 22px; font-size: 15.5px; line-height: 1.65; color: var(--ink-soft); max-width: 620px; }
.intro { margin-top: 14px; font-size: 14.5px; color: var(--ink-soft); max-width: 640px; }

/* ---- Home ---- */
.hero { max-width: 680px; }
.hero-ctas { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }
.cta { padding: 10px 18px; font-size: 13px; }
.cta--fill { background: var(--ink); color: var(--bg); border: none; }

.stats { margin-top: 88px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stat { background: var(--bg); padding: 28px; }
.stat-value { font-size: 32px; font-weight: 600; letter-spacing: -0.02em; }
.stat-value .dot { color: var(--accent); }
.stat-label { margin-top: 6px; font-size: 13.5px; font-weight: 500; }
.stat-note { margin-top: 4px; font-size: 12.5px; color: var(--ink-mute); }

/* ---- Bullets ---- */
.bullet { color: var(--accent); }
.bullet--mono { font-family: var(--mono); font-size: 12px; }
.dot-sep { display: inline-block; width: 3px; height: 3px; border-radius: 999px; background: var(--ink-mute); }

/* ---- Research ---- */
.nature-grid { margin-top: 22px; display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.nature-item { background: var(--panel); padding: 26px 28px; }
.nature-head { display: flex; justify-content: space-between; align-items: baseline; gap: 32px; }
.nature-title { font-size: 18px; line-height: 1.32; font-weight: 500; max-width: 820px; }
.nature-venue { font-size: 12px; color: var(--accent); font-weight: 600; white-space: nowrap; letter-spacing: 0.04em; text-transform: uppercase; }
.nature-meta { margin-top: 10px; display: flex; gap: 18px; align-items: center; font-size: 13px; color: var(--ink-mute); }

.areas-grid { margin-top: 22px; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.area-head { display: flex; align-items: baseline; gap: 10px; }
.area-num { font-size: 12px; color: var(--ink-mute); font-family: var(--mono); }
.area-title { font-size: 19px; }
.area-body { margin-top: 10px; font-size: 14.5px; line-height: 1.6; color: var(--ink-soft); max-width: 520px; }

.bullet-list { margin-top: 18px; padding: 0; list-style: none; display: grid; gap: 14px; }
.bullet-list li { display: flex; gap: 14px; font-size: 14px; color: var(--ink-soft); line-height: 1.55; }

/* ---- Publications ---- */
.pub-groups { margin-top: 48px; display: grid; gap: 44px; }
.pub-group-head { display: flex; align-items: baseline; gap: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.pub-group-head h3 { font-size: 18px; }
.pub-count { font-size: 12px; color: var(--ink-mute); }
.pub-list { margin-top: 20px; padding: 0; list-style: none; display: grid; gap: 22px; }
.pub-item { display: grid; grid-template-columns: 44px 1fr; gap: 16px; }
.pub-num { font-family: var(--mono); font-size: 12px; color: var(--ink-mute); padding-top: 3px; }
.pub-authors { font-size: 13.5px; color: var(--ink-soft); }
.author-self { color: var(--ink); font-weight: 600; }
.pub-title { margin-top: 4px; font-size: 15px; color: var(--ink); line-height: 1.45; max-width: 820px; }
.pub-meta { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; font-size: 12.5px; color: var(--ink-mute); }
.pub-venue { font-style: italic; }
.pub-note { color: var(--accent); font-weight: 500; }

/* ---- Teaching ---- */
.teach-grid { margin-top: 48px; display: grid; grid-template-columns: 1.4fr 1fr; gap: 56px; }
.teach-courses { margin-top: 18px; display: grid; gap: 22px; }
.course { padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.teach-courses .course:last-child { padding-bottom: 0; border-bottom: none; }
.course-head { display: flex; justify-content: space-between; gap: 14px; }
.course-title { font-size: 16px; max-width: 480px; }
.course-year { font-size: 12px; color: var(--ink-mute); white-space: nowrap; }
.course-where { margin-top: 4px; font-size: 13px; color: var(--accent); }
.course-body { margin-top: 8px; font-size: 14px; color: var(--ink-soft); line-height: 1.55; }
.ta-list { margin-top: 16px; padding: 0; list-style: none; display: grid; gap: 8px; }
.ta-list li { font-size: 13.5px; color: var(--ink-soft); display: flex; gap: 12px; }
.mentor-list { margin-top: 18px; display: grid; gap: 14px; }
.mentor-card { padding: 14px 16px; }
.mentor-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.mentor-name { font-size: 14.5px; }
.mentor-level { font-size: 11.5px; color: var(--ink-mute); }
.mentor-where { margin-top: 4px; font-size: 12.5px; color: var(--ink-soft); }
.mentor-advisor { margin-top: 2px; font-size: 11.5px; color: var(--ink-mute); }

/* ---- CV ---- */
.cv-head { display: flex; justify-content: space-between; align-items: baseline; }
.cv-grid { margin-top: 56px; display: grid; grid-template-columns: 200px 1fr; gap: 48px; }
.cv-label { padding-top: 6px; }
.cv-rule { grid-column: 1 / -1; height: 1px; background: var(--line); }
.cv-list { display: grid; gap: 22px; }

.edu-row { display: grid; grid-template-columns: 1fr 110px; gap: 16px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.cv-list .edu-row:last-child { padding-bottom: 0; border-bottom: none; }
.edu-degree { font-size: 16px; }
.edu-school { margin-top: 4px; font-size: 13.5px; color: var(--ink-soft); }
.edu-advisor { margin-top: 4px; font-size: 12.5px; color: var(--ink-mute); }
.edu-thesis { margin-top: 6px; font-size: 13px; color: var(--ink-soft); font-style: italic; }
.edu-year { font-size: 12px; color: var(--ink-mute); text-align: right; }

.pos { padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.cv-list .pos:last-child { padding-bottom: 0; border-bottom: none; }
.pos-head { display: flex; justify-content: space-between; gap: 16px; }
.pos-role { font-size: 16px; }
.pos-where { margin-top: 4px; font-size: 13.5px; color: var(--ink-soft); }
.pos-advisor { margin-top: 4px; font-size: 12px; color: var(--ink-mute); }
.pos-dates { font-size: 12px; color: var(--ink-mute); white-space: nowrap; }
.pos-bullets { margin-top: 10px; padding: 0; list-style: none; display: grid; gap: 6px; }
.pos-bullets li { font-size: 13.5px; color: var(--ink-soft); line-height: 1.55; display: flex; gap: 10px; }

.award-list { display: grid; gap: 10px; }
.award-row { display: grid; grid-template-columns: 1fr 110px; gap: 16px; font-size: 13.5px; color: var(--ink-soft); align-items: baseline; }
.award-name { color: var(--ink); font-weight: 500; }
.award-where { color: var(--ink-mute); }
.award-year { color: var(--ink-mute); text-align: right; }

.patent-list { display: grid; gap: 18px; }
.patent-title { font-size: 15px; line-height: 1.4; }
.patent-meta { margin-top: 6px; font-size: 12.5px; color: var(--ink-mute); }

.talk-list { display: grid; gap: 14px; }
.talk-row { display: grid; grid-template-columns: 70px 1fr 120px; gap: 14px; font-size: 13.5px; }
.talk-kind { justify-self: start; }
.talk-title { color: var(--ink); }
.talk-venue { margin-top: 3px; font-size: 12.5px; color: var(--ink-mute); }
.talk-date { font-size: 12px; color: var(--ink-mute); text-align: right; }

.skill-list { display: grid; gap: 12px; }
.skill-row { display: grid; grid-template-columns: 180px 1fr; gap: 16px; font-size: 13.5px; }
.skill-key { color: var(--ink-mute); }
.skill-val { color: var(--ink-soft); }

.service-list { display: grid; gap: 14px; font-size: 13.5px; color: var(--ink-soft); }
.service-lead { color: var(--ink); font-weight: 500; }
.service-sub { color: var(--ink); font-weight: 500; margin-bottom: 4px; }
.service-sublist { padding: 0; list-style: none; display: grid; gap: 4px; }
.service-sublist li { display: flex; gap: 10px; }

.media-list { display: grid; gap: 10px; }
.media-row { display: grid; grid-template-columns: 1fr 220px 100px; gap: 16px; font-size: 13.5px; }
.media-headline { color: var(--ink); }
.media-outlet { color: var(--ink-soft); font-style: italic; }
.media-year { color: var(--ink-mute); text-align: right; }

.ref-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.ref-card { padding: 16px 18px; }
.ref-name { font-size: 14.5px; }
.ref-role { margin-top: 4px; font-size: 12.5px; color: var(--ink-soft); }
.ref-where { margin-top: 2px; font-size: 12.5px; color: var(--ink-mute); }
.ref-email { margin-top: 6px; font-size: 12.5px; color: var(--accent); }

/* ---- Contact ---- */
.contact-grid { margin-top: 48px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; }
.reach-list { margin-top: 18px; display: grid; gap: 14px; }
.reach-card { padding: 18px 20px; }
.reach-card--sm { padding: 16px 18px; }
.reach-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.reach-label { font-size: 11.5px; color: var(--ink-mute); letter-spacing: 0.08em; text-transform: uppercase; }
.reach-value { margin-top: 6px; font-size: 17px; color: var(--ink); }
.reach-value--link { font-size: 14px; color: var(--accent); }
.reach-value--loc { font-size: 15px; color: var(--ink); }
.reach-sub { margin-top: 2px; font-size: 13px; color: var(--ink-soft); }

.collab-list { margin-top: 18px; display: grid; gap: 10px; }
.collab-person { display: grid; grid-template-columns: 1fr; gap: 2px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.collab-list .collab-person:last-child { padding-bottom: 0; border-bottom: none; }
.collab-pname { font-size: 14px; color: var(--ink); font-weight: 500; }
.collab-prole { font-size: 12px; color: var(--ink-soft); }

/* ---- Collaborator map ---- */
.collab-map { position: relative; height: 520px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.collab-svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.collab-center { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); background: var(--ink); color: var(--bg); padding: 14px 22px; border-radius: 999px; font-size: 14px; font-weight: 600; white-space: nowrap; box-shadow: 0 0 0 8px var(--bg), 0 0 0 9px var(--line); }
.collab-node { position: absolute; transform: translate(-50%, -50%); text-align: center; width: 180px; }
.collab-node-label { display: inline-block; padding: 6px 12px; background: var(--accent-soft); color: var(--accent); border-radius: 999px; font-size: 11.5px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; }
.collab-node-city { margin-top: 6px; font-size: 10.5px; color: var(--ink-mute); }
.collab-node-people { margin-top: 6px; font-size: 11.5px; color: var(--ink-soft); line-height: 1.5; }

/* ============================================================
   Responsive — breakpoints 900 / 700 / 600 (per README)
   ============================================================ */

/* <=900: multi-column grids collapse to single column */
@media (max-width: 900px) {
  .areas-grid,
  .teach-grid,
  .contact-grid,
  .reach-pair,
  .ref-grid { grid-template-columns: 1fr; }
  .teach-grid,
  .contact-grid { gap: 32px; }

  .cv-grid { grid-template-columns: 1fr; gap: 14px; }
  .cv-label { padding-top: 0; }

  .edu-row,
  .award-row,
  .talk-row,
  .media-row,
  .skill-row { grid-template-columns: 1fr; gap: 4px; }
  .edu-year,
  .award-year,
  .talk-date,
  .media-year { text-align: left; }

  .stats { grid-template-columns: 1fr 1fr; }
  .pub-item { grid-template-columns: 32px 1fr; }
}

/* <=700: masthead + footer stack vertically */
@media (max-width: 700px) {
  .nav { flex-direction: column; align-items: flex-start; gap: 14px; }
  .nav-links { flex-wrap: wrap; gap: 18px; }
  .footer { flex-direction: column; align-items: flex-start; gap: 14px; }
}

/* <=600: display type -30%, padding 24px, hero mark reflows */
@media (max-width: 600px) {
  .h1-hero { font-size: 44px; }
  .h1-page { font-size: 31px; }

  .nav,
  .footer { padding-left: 24px; padding-right: 24px; }
  .section { padding: 72px 24px 96px; }
  .section--home { padding: 48px 24px 96px; }

  .stats { grid-template-columns: 1fr; }

  .a-hat-wrap { position: static; width: 140px; height: 140px; margin: 0 0 24px auto; }

  .collab-map { height: 640px; }
  .collab-node { width: 130px; }
  .collab-center { font-size: 12px; padding: 10px 16px; }
}