/* ==========================================================================
   Prajakta Mane · Portfolio
   Design system + component styles
   ========================================================================== */

/* ---- Tokens ---- */
:root {
  /* Palette (extended from NHTSA chart) */
  --bg:            #0d1117;
  --bg-elevated:  #161b22;
  --bg-inset:     #10151c;
  --border:       #30363d;
  --border-soft:  #21262d;

  --text:         #f0efe9;
  --text-muted:   #8b949e;
  --text-dim:     #6e7681;

  --accent-red:   #f85149;
  --accent-blue:  #58a6ff;
  --accent-amber: #d29922;
  --accent-green: #3fb950;

  /* Type */
  --font-display: 'Newsreader', ui-serif, Georgia, serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  /* Scale */
  --step-0:   0.9375rem;   /* 15 */
  --step-1:   1rem;        /* 16 */
  --step-2:   1.125rem;    /* 18 */
  --step-3:   1.375rem;    /* 22 */
  --step-4:   1.75rem;     /* 28 */
  --step-5:   2.25rem;     /* 36 */
  --step-6:   3rem;        /* 48 */
  --step-7:   4.25rem;     /* 68 */
  --step-8:   5.5rem;      /* 88 */

  /* Layout */
  --max-w:    1120px;
  --gutter:   1.5rem;
  --section-y: clamp(5rem, 10vw, 8rem);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-1);
  line-height: 1.55;
  font-feature-settings: "ss01", "cv02", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

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

/* ---- Signature: annotation labels ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}
.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}
.annotation {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

/* ---- Nav ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 1.25rem 0;
  background: rgba(13, 17, 23, 0.72);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease;
}
.nav.scrolled { border-bottom-color: var(--border-soft); }
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  color: var(--text);
}
.nav__brand span { color: var(--accent-red); }
.nav__links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}
.nav__links a {
  font-size: 0.9375rem;
  color: var(--text-muted);
  transition: color 150ms ease;
  position: relative;
}
.nav__links a:hover { color: var(--text); }
.nav__cta {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  transition: border-color 150ms ease, background 150ms ease;
}
.nav__cta:hover { border-color: var(--accent-red); background: rgba(248, 81, 73, 0.06); }
.nav__toggle { display: none; }

/* ---- Hero ---- */
.hero {
  padding-top: 10rem;
  padding-bottom: var(--section-y);
  position: relative;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: end;
}
.hero__eyebrow { margin-bottom: 2rem; }
.hero__name {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(3rem, 7vw, var(--step-8));
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 1.5rem;
}
.hero__name em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent-red);
}
.hero__tagline {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.25rem, 2.2vw, var(--step-4));
  line-height: 1.35;
  color: var(--text-muted);
  max-width: 34ch;
  margin-bottom: 2.5rem;
}
.hero__meta {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  padding-top: 2rem;
  border-top: 1px solid var(--border-soft);
}
.hero__meta-item { display: flex; flex-direction: column; gap: 0.375rem; }
.hero__meta-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-dim);
}
.hero__meta-value { font-size: 0.9375rem; color: var(--text); }

.hero__photo {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: 2px;
}
.hero__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.15) contrast(1.02);
}
.hero__photo::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(13, 17, 23, 0.4) 100%);
  pointer-events: none;
}
.hero__photo-annotation {
  position: absolute;
  bottom: -1.75rem;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

/* ---- Section base ---- */
.section {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
  position: relative;
}
.section__header {
  margin-bottom: 4rem;
  max-width: 720px;
}
.section__eyebrow { margin-bottom: 1.5rem; }
.section__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2rem, 4vw, var(--step-6));
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin-bottom: 1.25rem;
}
.section__title em {
  font-style: italic;
  color: var(--accent-red);
  font-weight: 400;
}
.section__lede {
  font-size: var(--step-2);
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 60ch;
}

/* ---- About ---- */
.about { border-top: 1px solid var(--border-soft); }
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.8fr;
  gap: 4rem;
  align-items: start;
}
.about__body { font-size: var(--step-2); line-height: 1.7; color: var(--text); }
.about__body p + p { margin-top: 1.25rem; }
.about__body a {
  color: var(--accent-blue);
  border-bottom: 1px solid rgba(88, 166, 255, 0.3);
  transition: border-color 150ms ease;
}
.about__body a:hover { border-color: var(--accent-blue); }

.about__side { display: flex; flex-direction: column; gap: 2.5rem; }
.about__meta-block h4 {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  margin-bottom: 0.875rem;
  font-weight: 500;
}
.about__meta-block ul { list-style: none; }
.about__meta-block li {
  font-size: 0.9375rem;
  padding: 0.375rem 0;
  color: var(--text);
  border-bottom: 1px solid var(--border-soft);
}
.about__meta-block li:last-child { border-bottom: none; }

/* ---- Skills pills ---- */
.skills { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.skill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.375rem 0.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: 3px;
  color: var(--text-muted);
  transition: color 150ms ease, border-color 150ms ease;
}
.skill:hover { color: var(--text); border-color: var(--border); }

/* ---- Case studies ---- */
.cases { border-top: 1px solid var(--border-soft); }
.cases__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.case-card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  overflow: hidden;
  transition: border-color 200ms ease, transform 200ms ease;
  color: inherit;
}
.case-card:hover {
  border-color: var(--border);
  transform: translateY(-2px);
}
.case-card__image {
  position: relative;
  background: var(--bg-inset);
  overflow: hidden;
  min-height: 320px;
}
.case-card__image img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
}
.case-card__body { padding: 2.5rem; display: flex; flex-direction: column; gap: 1rem; }
.case-card__meta {
  display: flex;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.case-card__meta span { position: relative; }
.case-card__meta span + span::before {
  content: '';
  position: absolute; left: -0.75rem; top: 50%;
  width: 3px; height: 3px;
  background: var(--text-dim);
  border-radius: 50%;
  transform: translateY(-50%);
}
.case-card__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--step-4);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}
.case-card__desc { color: var(--text-muted); line-height: 1.6; flex: 1; }
.case-card__stats {
  display: flex; gap: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-soft);
}
.case-card__stat { display: flex; flex-direction: column; gap: 0.25rem; }
.case-card__stat-value {
  font-family: var(--font-display);
  font-size: var(--step-3);
  color: var(--accent-red);
  font-weight: 400;
}
.case-card__stat-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}
.case-card__cta {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-red);
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
}
.case-card__cta::after {
  content: '→';
  transition: transform 150ms ease;
}
.case-card:hover .case-card__cta::after { transform: translateX(3px); }

.case-card--placeholder {
  opacity: 0.5;
  pointer-events: none;
  border-style: dashed;
}
.case-card--placeholder .case-card__image {
  background: repeating-linear-gradient(
    45deg,
    var(--bg-inset),
    var(--bg-inset) 10px,
    transparent 10px,
    transparent 20px
  );
}

/* ---- Contact ---- */
.contact {
  border-top: 1px solid var(--border-soft);
  text-align: center;
}
.contact__eyebrow { margin-bottom: 2rem; justify-content: center; }
.contact__eyebrow::before { display: none; }
.contact__eyebrow::after {
  content: '';
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
  margin-left: 0.75rem;
}
.contact__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.25rem, 5vw, var(--step-7));
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
}
.contact__title em { font-style: italic; color: var(--accent-red); font-weight: 300; }
.contact__email {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  color: var(--accent-blue);
  border-bottom: 1px solid rgba(88, 166, 255, 0.3);
  padding-bottom: 0.25rem;
  margin-bottom: 3rem;
  transition: border-color 150ms ease;
}
.contact__email:hover { border-color: var(--accent-blue); }
.contact__socials {
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}
.contact__socials a {
  color: var(--text-muted);
  transition: color 150ms ease;
  position: relative;
}
.contact__socials a:hover { color: var(--text); }

/* ---- Footer ---- */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ==========================================================================
   Case study page
   ========================================================================== */
.case-hero {
  padding-top: 9rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--border-soft);
}
.case-hero__back {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 150ms ease;
}
.case-hero__back:hover { color: var(--text); }
.case-hero__back::before { content: '←'; }
.case-hero__eyebrow { margin-bottom: 1.5rem; }
.case-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.25rem, 5vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin-bottom: 1.75rem;
  max-width: 22ch;
}
.case-hero__title em { font-style: italic; color: var(--accent-red); font-weight: 300; }
.case-hero__lede {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--step-3);
  line-height: 1.5;
  color: var(--text-muted);
  max-width: 55ch;
  margin-bottom: 3rem;
}
.case-hero__meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-soft);
}
.case-hero__meta-item { display: flex; flex-direction: column; gap: 0.375rem; }
.case-hero__meta-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}
.case-hero__meta-value { font-size: 0.9375rem; color: var(--text); line-height: 1.4; }

.case-body {
  padding-top: 4rem;
  padding-bottom: var(--section-y);
}
.case-body__inner {
  max-width: 720px;
  margin: 0 auto;
}
.case-body h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-top: 3.5rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-left: 1.75rem;
}
.case-body h2::before {
  content: '';
  position: absolute;
  left: 0; top: 0.6em;
  width: 12px; height: 1px;
  background: var(--accent-red);
}
.case-body p {
  font-size: var(--step-2);
  line-height: 1.75;
  margin-bottom: 1.25rem;
  color: var(--text);
}
.case-body p + p { margin-top: 0; }
.case-body ul, .case-body ol { margin: 1.25rem 0 1.25rem 1.5rem; }
.case-body li {
  font-size: var(--step-2);
  line-height: 1.7;
  margin-bottom: 0.75rem;
  color: var(--text);
}
.case-body li strong { color: var(--accent-red); font-weight: 500; }
.case-body strong { color: var(--text); font-weight: 500; }
.case-body a {
  color: var(--accent-blue);
  border-bottom: 1px solid rgba(88, 166, 255, 0.3);
}
.case-body a:hover { border-color: var(--accent-blue); }

.case-body__figure {
  margin: 3rem 0;
  padding: 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: 4px;
}
.case-body__figure img { border-radius: 2px; }
.case-body__figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 1rem;
  text-align: center;
  letter-spacing: 0.05em;
}

.case-body__pullquote {
  font-family: var(--font-display);
  font-weight: 300;
  font-style: italic;
  font-size: var(--step-4);
  line-height: 1.35;
  color: var(--text);
  margin: 3rem 0;
  padding-left: 1.75rem;
  border-left: 2px solid var(--accent-red);
  max-width: 40ch;
}

.case-footer {
  border-top: 1px solid var(--border-soft);
  padding: 3rem 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.case-footer__github {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.case-footer__back {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-muted);
}
.case-footer__back:hover { color: var(--text); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero__photo { max-width: 320px; }
  .hero { padding-top: 8rem; }
  .about__grid { grid-template-columns: 1fr; gap: 3rem; }
  .case-card { grid-template-columns: 1fr; }
  .case-card__image { min-height: 220px; }
  .case-hero__meta { grid-template-columns: 1fr 1fr; }
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 0.5rem;
  }
  .nav__toggle span {
    width: 20px; height: 1px;
    background: var(--text);
  }
  .nav__mobile {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border-soft);
    padding: 1.5rem var(--gutter);
    flex-direction: column;
    gap: 1rem;
  }
  .nav__mobile.open { display: flex; }
  .nav__mobile a {
    font-size: 1rem;
    color: var(--text);
    padding: 0.5rem 0;
  }
}
@media (max-width: 600px) {
  .hero__meta { gap: 1.5rem; }
  .case-card__body { padding: 1.75rem; }
  .case-card__stats { flex-wrap: wrap; gap: 1.25rem; }
  .case-hero__meta { grid-template-columns: 1fr; }
  .footer__inner { flex-direction: column; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}

/* Focus states */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
  border-radius: 2px;
}