/* ==========================================================================
   Musana Ali Khan — Portfolio
   Design tokens: paper background, ink text, teal + brass accents,
   Fraunces (display) / Inter (body) / IBM Plex Mono (index & tags)
   ========================================================================== */

:root {
  --paper: #faf9f6;
  --paper-alt: #f1efe9;
  --ink: #16203a;
  --muted: #5c6478;
  --line: #e2ded3;
  --accent: #0f6d66;      /* deep teal */
  --accent-soft: #e4efee;
  --brass: #ab8654;       /* warm brass, used sparingly */
  --card: #ffffff;
  --shadow: 0 1px 2px rgba(22,32,58,0.04), 0 8px 24px rgba(22,32,58,0.05);
  --radius: 4px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: "Fraunces", Georgia, "Times New Roman", serif;
  font-weight: 560;
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.01em;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.mono {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

img { max-width: 100%; display: block; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap;
}

/* Keyboard focus only ------------------------------------------------- */
body:not(.user-is-tabbing) *:focus { outline: none; }
.user-is-tabbing *:focus { outline: 2px solid var(--accent); outline-offset: 3px; }

/* Layout shell ---------------------------------------------------------- */
.shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  max-width: var(--maxw);
  margin: 0 auto;
}

/* Index rail -------------------------------------------------------------- */
.rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  padding: 40px 20px 40px 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid var(--line);
}

.rail-top .brand {
  font-family: "Fraunces", serif;
  font-size: 19px;
  font-weight: 600;
  margin-bottom: 4px;
}

.rail-top .brand-role {
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 32px;
}

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rail-nav a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--muted);
  font-size: 13.5px;
  padding: 6px 0;
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px;
  margin-left: -12px;
  transition: color .15s ease, border-color .15s ease;
}

.rail-nav a .num {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--line);
  min-width: 18px;
}

.rail-nav a:hover,
.rail-nav a.active {
  color: var(--ink);
  text-decoration: none;
}

.rail-nav a.active { border-left-color: var(--accent); }
.rail-nav a.active .num { color: var(--accent); }

.rail-bottom { display: flex; flex-direction: column; gap: 14px; }

.rail-cta {
  display: inline-block;
  text-align: center;
  background: var(--ink);
  color: var(--paper) !important;
  font-size: 13px;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: var(--radius);
  text-decoration: none;
}
.rail-cta:hover { background: var(--accent); text-decoration: none; }

.rail-socials {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.rail-socials a {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
}
.rail-socials a:hover { color: var(--accent); }

/* Mobile top bar (hidden on desktop) */
.mobile-bar { display: none; }

/* Main content ------------------------------------------------------------ */
main { padding: 0 28px; }

section {
  padding: 90px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 20px;
}
section:last-of-type { border-bottom: none; }

.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}

.section-heading {
  font-size: 28px;
  margin-bottom: 36px;
}

/* Hero --------------------------------------------------------------- */
#hero { padding-top: 60px; }

.hero-name {
  font-size: clamp(38px, 4vw, 56px);
  line-height: 1.05;
  margin-bottom: 10px;
}

.hero-role {
  font-size: 18px;
  color: var(--muted);
  margin-bottom: 26px;
}

.hero-lede {
  max-width: 620px;
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 32px;
}

.hero-meta {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-meta div .h {
  font-family: "Fraunces", serif;
  font-size: 22px;
  font-weight: 600;
}
.hero-meta div .t {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--ink);
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); text-decoration: none; }
.btn-secondary { background: transparent; color: var(--ink); }
.btn-secondary:hover { background: var(--paper-alt); text-decoration: none; }

/* About / experience ---------------------------------------------------- */
.lede-block { max-width: 720px; font-size: 16.5px; }
.lede-block p { margin: 0 0 16px; }

.exp-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.exp-item:first-of-type { border-top: none; }

.exp-dates {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
  color: var(--muted);
  padding-top: 3px;
}

.exp-role { font-size: 18px; margin-bottom: 2px; }
.exp-org { color: var(--accent); font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.exp-bullets { margin: 0; padding-left: 18px; color: var(--ink); font-size: 15px; }
.exp-bullets li { margin-bottom: 7px; }

/* Projects — selected ----------------------------------------------------- */
.proj-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.proj-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.proj-media {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--paper-alt);
}
.proj-media img { width: 100%; height: 100%; object-fit: cover; }

.proj-body { padding: 22px 24px 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; }

.proj-client {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--brass);
}

.proj-title { font-size: 19px; }

.proj-desc { color: var(--muted); font-size: 14.5px; flex: 1; }

.chip-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 2px; }

.chip {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 4px 9px;
  border-radius: 999px;
}

.proj-links { display: flex; gap: 14px; margin-top: 8px; font-size: 13px; }

/* More projects — compact list ------------------------------------------- */
.more-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.more-table th {
  text-align: left;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
  font-weight: 600;
  padding: 0 12px 10px;
  border-bottom: 1px solid var(--line);
}
.more-table td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  vertical-align: top;
}
.more-table tr:last-child td { border-bottom: none; }
.more-table .mt-name { font-weight: 600; }
.more-table .mt-client { color: var(--muted); font-size: 13px; }
.more-table .mt-year { font-family: "IBM Plex Mono", monospace; font-size: 12.5px; color: var(--muted); white-space: nowrap; }
.more-table .mt-stack { color: var(--muted); font-size: 13px; }
.more-table .mt-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 5px;
  font-size: 12.5px;
}

/* Skills ------------------------------------------------------------------ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px 40px;
}
.skill-cat h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
  font-family: "Inter", sans-serif;
  font-weight: 700;
  margin-bottom: 12px;
}
.skill-cat .chip-row { gap: 8px; }
.skill-cat .chip { background: var(--paper-alt); color: var(--ink); }

/* Education / academic ----------------------------------------------------- */
.edu-block { margin-bottom: 40px; }
.edu-degree { font-size: 19px; margin-bottom: 4px; }
.edu-org { color: var(--muted); font-size: 14.5px; margin-bottom: 10px; }
.edu-course { color: var(--muted); font-size: 13.5px; max-width: 640px; }

.fyp-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 28px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
}
.fyp-card img { border-radius: 3px; }
.fyp-title { font-size: 18px; margin-bottom: 6px; }
.fyp-body p { font-size: 14.5px; color: var(--ink); margin: 0 0 10px; }
.fyp-body ul { margin: 0 0 12px; padding-left: 18px; font-size: 14px; color: var(--ink); }
.fyp-body li { margin-bottom: 5px; }

.other-academic {
  margin-top: 18px;
  font-size: 14px;
  color: var(--muted);
}

/* Achievements -------------------------------------------------------------- */
.ach-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.ach-list li {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 18px;
  font-size: 14.5px;
  align-items: baseline;
}
.ach-year { font-family: "IBM Plex Mono", monospace; color: var(--accent); font-size: 13px; }

/* Contact / footer ----------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}
.contact-lede { font-size: 17px; max-width: 420px; margin-bottom: 24px; }
.contact-links { display: grid; gap: 10px; }
.contact-links a { font-size: 15px; }

form.contact-form { display: grid; gap: 12px; }
form.contact-form input,
form.contact-form textarea {
  font-family: inherit;
  font-size: 14.5px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--ink);
}
form.contact-form textarea { resize: vertical; min-height: 100px; }
form.contact-form button {
  justify-self: start;
  cursor: pointer;
  font-family: inherit;
}

footer {
  padding: 30px 0 50px;
  font-size: 12.5px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* Responsive ------------------------------------------------------------------ */
@media (max-width: 980px) {
  .shell { display: block; }
  .rail { display: none; }
  .mobile-bar {
    display: flex;
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(250,249,246,0.94);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--line);
    padding: 14px 20px;
    align-items: center;
    justify-content: space-between;
  }
  .mobile-bar .brand { font-family: "Fraunces", serif; font-weight: 600; font-size: 16px; }
  .mobile-bar a.btn { padding: 8px 14px; font-size: 13px; }
  main { padding: 0 20px; }
  section { padding: 56px 0; }
  .proj-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .exp-item { grid-template-columns: 1fr; gap: 8px; }
  .fyp-card { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .more-table .mt-stack { display: none; }
}