/* ===========================================================
   mhkhokhar.com — Design System
   Reference: OpenAI Research / Anthropic / Stripe / Linear / Vercel
   =========================================================== */

:root{
  --bg: #FFFFFF;
  --bg-alt: #FAFAFA;
  --text: #111111;
  --text-secondary: #555555;
  --text-tertiary: #8A8A8A;
  --accent: #2563EB;
  --accent-dim: #2563EB1a;
  --success: #16A34A;
  --border: #E7E7E7;
  --border-strong: #D8D8D8;

  --font-heading: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --max-width: 1200px;
  --content-width: 760px;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;
  --space-7: 9rem;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

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

body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a{ color: inherit; text-decoration: none; }
img{ max-width: 100%; display: block; }
ul{ margin: 0; padding: 0; list-style: none; }

h1,h2,h3,h4{
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin: 0;
  letter-spacing: -0.01em;
}

p{ margin: 0; }

::selection{ background: var(--accent-dim); color: var(--text); }

:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.shell{
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.prose-shell{
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 2rem;
}

@media (max-width: 640px){
  .shell, .prose-shell{ padding: 0 1.25rem; }
}

/* ---------- Eyebrow / mono labels (signature device) ---------- */

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.eyebrow::before{
  content: "";
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 1px;
  flex-shrink: 0;
}

.eyebrow.muted{ color: var(--text-tertiary); }
.eyebrow.muted::before{ background: var(--text-tertiary); }

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

.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.86);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .shell{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.wordmark{
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
}
.wordmark span{ color: var(--accent); }

.nav-links{
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-links a{
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color 0.15s ease;
}
.nav-links a:hover{ color: var(--text); }
.nav-links a.active{ color: var(--text); }
.nav-links a.active::after{
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.nav-cta{
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 7px 14px !important;
  font-size: 0.82rem !important;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.nav-cta:hover{ border-color: var(--accent); background: var(--accent-dim); }

.nav-toggle{
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span{
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  margin: 4px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 860px){
  .nav-links{
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0.5rem 1.25rem 1.5rem;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }
  .nav-links.open{
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a{ padding: 12px 0; width: 100%; }
  .nav-links a.active::after{ display: none; }
  .nav-toggle{ display: block; }
}

/* ---------- Now pill ---------- */

.now-pill{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 12px 6px 10px;
  background: var(--bg-alt);
}
.now-dot{
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px #16A34A22;
  flex-shrink: 0;
}

/* ---------- Buttons ---------- */

.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 12px 20px;
  border-radius: 7px;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn-primary{
  background: var(--text);
  color: #fff;
}
.btn-primary:hover{ background: var(--accent); }

.btn-secondary{
  border: 1px solid var(--border-strong);
  color: var(--text);
}
.btn-secondary:hover{ border-color: var(--accent); color: var(--accent); }

.btn-arrow{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent);
}
.btn-arrow .arrow{ transition: transform 0.15s ease; display: inline-block; }
.btn-arrow:hover .arrow{ transform: translateX(3px); }

/* ---------- Hero ---------- */

.hero{
  padding: var(--space-6) 0 var(--space-5);
  border-bottom: 1px solid var(--border);
}
.hero.compact{ padding: var(--space-5) 0 var(--space-4); }

.hero h1{
  font-size: clamp(2.1rem, 4.2vw, 3.4rem);
  max-width: 820px;
  margin-top: var(--space-2);
}

.hero .lede{
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin-top: var(--space-3);
  line-height: 1.7;
}

.hero-actions{
  display: flex;
  gap: 1rem;
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

/* signature waveform */
.signal{
  margin-top: var(--space-5);
  opacity: 0.9;
}
.signal svg{ width: 100%; height: auto; display: block; }
.signal-line{
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 1.4;
}
.signal-line.accent{
  stroke: var(--accent);
  stroke-width: 1.6;
}

/* ---------- Sections ---------- */

section.block{
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--border);
}
section.block:last-of-type{ border-bottom: none; }
section.block.alt{ background: var(--bg-alt); }

.section-head{
  max-width: 640px;
  margin-bottom: var(--space-4);
}
.section-head h2{
  font-size: 1.9rem;
  margin-top: var(--space-2);
}
.section-head .desc{
  color: var(--text-secondary);
  margin-top: var(--space-2);
  font-size: 1.02rem;
  line-height: 1.7;
}

.section-foot{
  margin-top: var(--space-4);
}

/* ---------- Cards / grids ---------- */

.grid{
  display: grid;
  gap: 1.25rem;
}
.grid-3{ grid-template-columns: repeat(3, 1fr); }
.grid-2{ grid-template-columns: repeat(2, 1fr); }

@media (max-width: 860px){
  .grid-3, .grid-2{ grid-template-columns: 1fr; }
}

.card{
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--space-3);
  background: var(--bg);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}
a.card:hover, .card.hoverable:hover{
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(17,17,17,0.06);
}

.card h3{
  font-size: 1.12rem;
  margin-top: var(--space-2);
}
.card .desc{
  color: var(--text-secondary);
  font-size: 0.94rem;
  margin-top: 0.6rem;
  line-height: 1.6;
  flex-grow: 1;
}
.card .card-foot{
  margin-top: var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-meta{
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-2);
}
.meta-tag{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 3px 8px;
}

/* Work system card (with spec block) */
.system-card{
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-4);
  background: var(--bg);
  transition: border-color 0.18s ease;
}
.system-card:hover{ border-color: var(--border-strong); }

.system-head{
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.system-head h3{ font-size: 1.35rem; }
.system-head .desc{
  color: var(--text-secondary);
  margin-top: 0.6rem;
  max-width: 560px;
  line-height: 1.65;
}

.spec-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}
@media (max-width: 720px){
  .spec-grid{ grid-template-columns: 1fr 1fr; }
}
.spec-label{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}
.spec-value{
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.5;
}
.spec-value.mono{ font-family: var(--font-mono); font-size: 0.82rem; }

.system-links{
  margin-top: var(--space-3);
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ---------- List rows (Writing / Notes) ---------- */

.row-list{
  border-top: 1px solid var(--border);
}
.row-item{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.15s ease;
}
a.row-item:hover{ padding-left: 6px; }
.row-item .row-title{
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.1rem;
}
.row-item .row-desc{
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: 4px;
  max-width: 560px;
  line-height: 1.6;
}
.row-item .row-arrow{
  color: var(--accent);
  font-size: 0.9rem;
  white-space: nowrap;
}

/* ---------- Idea entries ---------- */

.idea{
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border);
}
.idea:last-child{ border-bottom: none; }
.idea h3{ font-size: 1.25rem; margin-top: var(--space-1); }
.idea p{
  color: var(--text-secondary);
  margin-top: var(--space-2);
  line-height: 1.75;
  max-width: var(--content-width);
}

/* ---------- Essay / article ---------- */

.article-head{
  padding: var(--space-6) 0 var(--space-4);
  border-bottom: 1px solid var(--border);
}
.article-head .eyebrow{ margin-bottom: var(--space-2); }
.article-head h1{
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
}
.article-head .subtitle{
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: var(--space-2);
  line-height: 1.6;
}
.article-meta{
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

.article-body{
  padding: var(--space-5) 0;
}
.article-body h2{
  font-size: 1.4rem;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}
.article-body p{
  color: var(--text);
  font-size: 1.06rem;
  line-height: 1.85;
  margin-bottom: var(--space-2);
}
.article-body p.lead{
  color: var(--text-secondary);
  font-style: italic;
}

.article-nav{
  padding: var(--space-4) 0 var(--space-6);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ---------- About ---------- */

.about-block{
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border);
}
.about-block:first-child{ border-top: none; }
.about-block h2{ font-size: 1.3rem; }
.about-block p{
  color: var(--text-secondary);
  margin-top: var(--space-2);
  line-height: 1.8;
  font-size: 1.02rem;
}

/* ---------- Resume ---------- */

.resume-toolbar{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
}
.resume-section{ margin-bottom: var(--space-5); }
.resume-section h2{ font-size: 1.15rem; margin-bottom: var(--space-3); }
.resume-entry{ margin-bottom: var(--space-3); }
.resume-entry .role{ font-weight: 600; font-size: 1rem; }
.resume-entry .org{ color: var(--text-secondary); font-style: italic; font-size: 0.92rem; margin-top: 2px; }
.resume-entry ul{ margin-top: 0.6rem; }
.resume-entry li{
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.7;
  padding-left: 1.1rem;
  position: relative;
  margin-bottom: 0.4rem;
}
.resume-entry li::before{
  content: "–";
  position: absolute;
  left: 0;
  color: var(--text-tertiary);
}
.skill-row{ margin-bottom: 0.7rem; font-size: 0.92rem; line-height: 1.7; }
.skill-row .label{ font-weight: 600; }
.skill-row .items{ color: var(--text-secondary); }

/* ---------- Contact ---------- */

.contact-grid{
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-5);
}
@media (max-width: 780px){ .contact-grid{ grid-template-columns: 1fr; gap: var(--space-4); } }

.contact-list{ margin-top: var(--space-4); }
.contact-list li{
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border);
}
.contact-list li:first-child{ border-top: 1px solid var(--border); }
.contact-label{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-tertiary);
  margin-bottom: 4px;
}
.contact-value{ font-size: 1.02rem; font-weight: 500; }
.contact-value a:hover{ color: var(--accent); }

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

.site-footer{
  border-top: 1px solid var(--border);
  padding: var(--space-5) 0 var(--space-4);
}
.footer-top{
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.footer-name{ font-family: var(--font-heading); font-weight: 600; font-size: 1.05rem; }
.footer-tag{ color: var(--text-secondary); font-size: 0.9rem; margin-top: 6px; }
.footer-links{ display: flex; gap: var(--space-3); flex-wrap: wrap; }
.footer-links a{ font-size: 0.88rem; color: var(--text-secondary); }
.footer-links a:hover{ color: var(--text); }
.footer-bottom{
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-tertiary);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---------- Reveal on scroll ---------- */

.reveal{
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.in{
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Utility ---------- */

.mt-1{ margin-top: var(--space-1); }
.mt-2{ margin-top: var(--space-2); }
.mt-3{ margin-top: var(--space-3); }
.mt-4{ margin-top: var(--space-4); }
.text-secondary{ color: var(--text-secondary); }