/* ============================================================
   Mehraj — portfolio design system
   Theme: "training-run notebook"
   Canvas: deep blue-ink + dot grid · Accents: amber / periwinkle
   Type: Bricolage Grotesque (display) · IBM Plex Sans (body)
         IBM Plex Mono (labels & data)
   ============================================================ */

:root {
  --bg:        #0a0f1e;
  --bg-raise:  #101731;
  --bg-raise-2:#151d3b;
  --ink:       #e9edf9;
  --muted:     #96a1c0;
  --faint:     #5d688a;
  --line:      rgba(139, 147, 255, 0.16);
  --line-soft: rgba(139, 147, 255, 0.09);
  --amber:     #ffb454;
  --amber-dim: rgba(255, 180, 84, 0.14);
  --peri:      #8b93ff;
  --peri-dim:  rgba(139, 147, 255, 0.12);
  --teal:      #63e2c6;

  --font-display: "Bricolage Grotesque", "IBM Plex Sans", sans-serif;
  --font-body:    "IBM Plex Sans", system-ui, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, monospace;

  --maxw: 960px;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg);
  background-image: radial-gradient(rgba(139, 147, 255, 0.10) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--amber); color: #14100a; }

a { color: inherit; }

/* ---------------- Nav ---------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 15, 30, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: relative;
}

.brand {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}

.brand::after {
  content: "";
  display: inline-block;
  width: 0.55em;
  height: 1.05em;
  margin-left: 0.28em;
  vertical-align: -0.18em;
  background: var(--amber);
  animation: blink 1.15s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0; } }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--muted);
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.nav-links a:hover { color: var(--ink); }

.nav-links a.active {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.nav-links a.external::after {
  content: "↗";
  margin-left: 0.3em;
  color: var(--peri);
  font-size: 0.85em;
}

.socials {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.socials a {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--peri-dim);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.socials a:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
  background: var(--amber-dim);
}

.socials img { height: 17px; width: 17px; display: block; }

/* Mobile menu */

.menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
}

@media (max-width: 860px) {
  .menu-btn { display: inline-block; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg-raise);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 1.25rem 1rem;
  }

  .nav-links.open { display: flex; }

  .nav-links li { width: 100%; }

  .nav-links a {
    display: block;
    padding: 0.7rem 0;
    border-bottom: 1px solid var(--line-soft);
    font-size: 0.95rem;
  }

  .nav-links a.active { border-bottom-color: var(--amber); }

  .socials { gap: 0.6rem; }
}

/* ---------------- Layout ---------------- */

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 3.5rem 1.25rem 5rem;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--peri);
  margin: 0 0 0.9rem;
}

.eyebrow .dim { color: var(--faint); }

h1.display {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 5.5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 1.4rem;
}

h2.section {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.45rem;
  letter-spacing: -0.01em;
  margin: 3rem 0 1.1rem;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

h2.section::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
  transform: translateY(-0.35em);
}

.lede {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 42rem;
}

.lede strong, .prose strong { color: var(--ink); font-weight: 600; }

.prose p { color: var(--muted); max-width: 44rem; }

/* ---------------- Home hero ---------------- */

.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 3rem;
  align-items: center;
  padding-top: 1.5rem;
}

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; gap: 2.2rem; }
}

.portrait {
  position: relative;
  justify-self: center;
  width: min(300px, 80%);
  margin: 0;
}

.portrait img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  filter: saturate(0.92);
}

/* amber corner ticks */
.portrait::before,
.portrait::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 2px solid var(--amber);
}

.portrait::before { top: -9px; left: -9px; border-right: 0; border-bottom: 0; }
.portrait::after  { bottom: -9px; right: -9px; border-left: 0; border-top: 0; }

/* Loss curve — the signature */

.loss-curve {
  margin-top: 3.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--bg-raise), transparent);
  padding: 1.2rem 1.4rem 0.8rem;
  overflow: hidden;
}

.loss-curve .curve-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--faint);
  margin-bottom: 0.4rem;
}

.loss-curve .curve-head .ok { color: var(--teal); }

.loss-curve svg { display: block; width: 100%; height: auto; }

.curve-path {
  fill: none;
  stroke: var(--amber);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: draw 2.6s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}

.curve-fill {
  fill: url(#lossGrad);
  opacity: 0;
  animation: fadein 1.2s ease 2.4s forwards;
}

.curve-dot {
  fill: var(--peri);
  opacity: 0;
  animation: fadein 0.5s ease 0.6s forwards;
}

.curve-dot:nth-of-type(2) { animation-delay: 1.0s; }
.curve-dot:nth-of-type(3) { animation-delay: 1.5s; }
.curve-dot:nth-of-type(4) { animation-delay: 2.0s; }
.curve-dot:nth-of-type(5) { animation-delay: 2.5s; }

@keyframes draw   { to { stroke-dashoffset: 0; } }
@keyframes fadein { to { opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  .curve-path { animation: none; stroke-dashoffset: 0; }
  .curve-fill, .curve-dot { animation: none; opacity: 1; }
  .brand::after { animation: none; }
  * { transition: none !important; }
}

/* ---------------- Row lists (articles / talks) ---------------- */

.rows {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.rows li { border-bottom: 1px solid var(--line-soft); }

.rows a {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  padding: 1.05rem 0.4rem;
  text-decoration: none;
  color: var(--ink);
  transition: background 0.16s ease, padding-left 0.16s ease;
  border-radius: 6px;
}

.rows a:hover {
  background: var(--peri-dim);
  padding-left: 0.9rem;
}

.rows .idx {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--amber);
  min-width: 2.2rem;
}

.rows .title { flex: 1; font-weight: 500; }

.rows .arrow {
  font-family: var(--font-mono);
  color: var(--faint);
  transition: color 0.16s ease, transform 0.16s ease;
}

.rows a:hover .arrow { color: var(--amber); transform: translateX(3px); }

.rows .tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--faint);
  border: 1px solid var(--line);
  border-radius: 99px;
  padding: 0.1rem 0.55rem;
  white-space: nowrap;
}

@media (max-width: 620px) {
  .rows .tag { display: none; }
}

/* ---------------- Accordion (projects) ---------------- */

.acc {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--bg-raise), transparent 140%);
  margin-bottom: 1.1rem;
  overflow: hidden;
}

.acc summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.3rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
  transition: background 0.16s ease;
}

.acc summary::-webkit-details-marker { display: none; }

.acc summary:hover { background: var(--peri-dim); }

.acc summary .mark {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--amber);
  transition: transform 0.2s ease;
}

.acc[open] summary .mark { transform: rotate(45deg); }

.acc[open] summary { border-bottom: 1px solid var(--line-soft); }

.acc .acc-body { padding: 0.4rem 1.3rem 1rem; }

.acc .rows { border-top: none; margin-top: 0.2rem; }

/* ---------------- Tech stack chips ---------------- */

.stack {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.8rem;
  margin: 1.4rem 0 2.2rem;
}

.chip {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raise);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.chip:hover { transform: translateY(-3px); border-color: var(--peri); }

.chip img { height: 22px; width: 22px; border-radius: 4px; }

.chip span { font-size: 0.92rem; color: var(--ink); }

/* ---------------- Interest / focus lists ---------------- */

.tick-list {
  list-style: none;
  margin: 1rem 0 1.5rem;
  padding: 0;
  color: var(--muted);
}

.tick-list li {
  position: relative;
  padding: 0.35rem 0 0.35rem 1.7rem;
}

.tick-list li::before {
  content: "▸";
  position: absolute;
  left: 0.2rem;
  color: var(--amber);
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 2.5rem;
}

@media (max-width: 700px) {
  .two-col { grid-template-columns: 1fr; }
}

/* ---------------- Bookshelf ---------------- */

.books {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.1rem;
  margin-top: 1.6rem;
}

.book {
  position: relative;
  border: 1px solid var(--line);
  border-left: 5px solid var(--amber);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--bg-raise), transparent 160%);
  padding: 1.3rem 1.4rem 1.4rem;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.book:hover { transform: translateY(-4px); border-color: var(--peri); }

.book:nth-child(2) { border-left-color: var(--peri); }
.book:nth-child(3) { border-left-color: var(--teal); }

.book h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
  margin: 0 0 0.5rem;
  line-height: 1.35;
}

.book p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* ---------------- Footer ---------------- */

footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.6rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.footer-inner .brand::after { display: none; }

.footer-inner .brand { color: var(--faint); }

/* Focus visibility */
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 4px;
}