/* =========================================================
   Aram Hovsepyan — portfolio
   Single-stylesheet design system. Dark by default.
   ========================================================= */

:root {
  /* Type */
  --font-display: 'General Sans', 'Satoshi', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body:    'General Sans', 'Satoshi', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono:    'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

  --text-xs:   12px;
  --text-sm:   14px;
  --text-base: 16px;
  --text-md:   18px;
  --text-lg:   22px;
  --text-xl:   28px;
  --text-2xl:  38px;
  --text-3xl:  56px;
  --text-hero: clamp(40px, 6.6vw, 84px);

  --lh-tight: 1.05;
  --lh-snug:  1.2;
  --lh-body:  1.55;

  /* Spacing scale */
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 20px;
  --s-6: 24px; --s-8: 32px; --s-10: 40px; --s-12: 48px; --s-16: 64px;
  --s-20: 80px; --s-24: 96px; --s-32: 128px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --container: 1200px;
  --max-prose: 64ch;

  --transition: 200ms cubic-bezier(.2,.6,.2,1);

  /* Dark theme (default) */
  --bg:        #0d0f12;
  --bg-2:      #111418;
  --surface:   #14181d;
  --surface-2: #181d23;
  --border:    #232a32;
  --border-strong: #2d3640;
  --text:      #e6e8ea;
  --text-muted: #9aa3ae;
  --text-faint: #5f6770;
  --accent:    #7be0a4;          /* terminal green — confident, technical */
  --accent-2:  #4ec9b0;
  --accent-ink: #082313;
  --warn:      #f5c97b;
  --error:     #f08a8a;
  --grid-line: rgba(255,255,255,0.04);
  --shadow-1: 0 1px 0 rgba(255,255,255,0.03) inset, 0 8px 30px rgba(0,0,0,.35);
}

html[data-theme='light'] {
  --bg:        #f5f4ef;
  --bg-2:      #efede5;
  --surface:   #ffffff;
  --surface-2: #faf9f4;
  --border:    #e2dfd6;
  --border-strong: #cfcabd;
  --text:      #1a1d22;
  --text-muted: #5a6068;
  --text-faint: #93989f;
  --accent:    #0e7a4a;
  --accent-2:  #146b48;
  --accent-ink: #effff5;
  --warn:      #a76a00;
  --error:     #b34646;
  --grid-line: rgba(0,0,0,0.05);
  --shadow-1: 0 1px 0 rgba(0,0,0,0.02) inset, 0 8px 30px rgba(20,30,40,.07);
}

/* Reset & base */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font: 400 var(--text-base)/var(--lh-body) var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'ss01', 'ss02', 'cv11';
  overflow-x: hidden;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
::selection { background: var(--accent); color: var(--accent-ink); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-ink);
  padding: 8px 12px; border-radius: 4px; z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

/* Layout */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: clamp(20px, 4vw, 40px);
}

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.site-header.scrolled { border-bottom-color: var(--border); }

.header-grid {
  display: flex; align-items: center; gap: var(--s-6);
  padding-block: 14px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-weight: 600; font-size: var(--text-sm); letter-spacing: -0.01em; }
.brand-role { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); letter-spacing: 0.02em; }

.nav { margin-left: auto; }
.nav ul { list-style: none; display: flex; gap: var(--s-6); margin: 0; padding: 0; }
.nav a {
  text-decoration: none; color: var(--text-muted);
  font-size: var(--text-sm); font-weight: 500;
  padding: 8px 4px; border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.nav a:hover { color: var(--text); border-bottom-color: var(--accent); }

.header-actions { display: flex; gap: 8px; align-items: center; }
.icon-btn {
  appearance: none; background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; transition: background var(--transition), border-color var(--transition);
}
.icon-btn:hover { background: var(--surface-2); border-color: var(--border-strong); }
.menu-toggle { display: none; }

/* Theme icon swap */
html[data-theme='dark'] .icon-sun { display: none; }
html[data-theme='light'] .icon-moon { display: none; }

/* ===== Hero ===== */
.hero {
  position: relative;
  padding-top: clamp(56px, 10vw, 120px);
  padding-bottom: clamp(72px, 12vw, 160px);
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: clamp(20px, 4vw, 40px);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  mask-image: radial-gradient(circle at 20% 20%, black, transparent 70%);
  -webkit-mask-image: radial-gradient(circle at 20% 20%, black, transparent 70%);
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
}
.hero-main { min-width: 0; }
.hero-card { min-width: 0; align-self: center; }

.hero-meta {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 12px; color: var(--text-muted);
  border: 1px solid var(--border); padding: 6px 12px; border-radius: 999px;
  background: var(--surface);
  width: fit-content;
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 25%, transparent);
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  line-height: var(--lh-tight);
  letter-spacing: -0.025em;
  font-weight: 600;
  margin: 24px 0 22px;
}
.hero-title .accent { color: var(--accent); }
.hero-lede {
  color: var(--text-muted);
  font-size: var(--text-md);
  max-width: 56ch;
  margin: 0 0 var(--s-8);
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: var(--s-12); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; cursor: pointer;
  padding: 12px 18px; border-radius: 8px;
  font-family: var(--font-body); font-size: var(--text-sm);
  font-weight: 600; letter-spacing: -0.005em;
  border: 1px solid transparent;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost {
  background: transparent; color: var(--text);
  border-color: var(--border-strong);
  font-family: var(--font-mono); font-weight: 500; font-size: 13px;
}
.btn-ghost:hover { background: var(--surface); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.hero-stats > div { padding: 18px 16px 18px 0; border-right: 1px solid var(--border); }
.hero-stats > div:last-child { border-right: 0; }
.hero-stats dt {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.hero-stats dd { margin: 0; display: flex; align-items: baseline; gap: 4px; }
.hero-stats .num {
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-xl); letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.hero-stats .unit { color: var(--text-muted); font-family: var(--font-mono); font-size: 12px; }

/* Hero terminal card */
.hero-card { position: relative; }
.term {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}
.term-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.term-bar .dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #ec6a5e; } .dot-y { background: #f4be4f; } .dot-g { background: #61c454; }
.term-title {
  margin-left: 8px; font-family: var(--font-mono); font-size: 12px; color: var(--text-muted);
}
.term-body {
  margin: 0; padding: 18px 20px;
  font-family: var(--font-mono); font-size: 13px; line-height: 1.65;
  color: var(--text);
  white-space: pre; overflow-x: auto;
}
.tk-c { color: var(--text-faint); font-style: italic; }
.tk-k { color: var(--accent); }
.tk-t { color: var(--accent-2); }
.tk-s { color: var(--warn); }

/* ===== Sections ===== */
.section { padding-block: clamp(64px, 9vw, 128px); }
.section-alt { background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-head { max-width: 720px; margin-bottom: var(--s-12); }
.eyebrow {
  font-family: var(--font-mono); font-size: 12px; color: var(--text-muted);
  letter-spacing: 0.06em; text-transform: uppercase;
  margin: 0 0 var(--s-4); display: inline-flex; gap: 12px; align-items: center;
}
.eyebrow-num { color: var(--accent); }
.section h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, var(--text-2xl));
  line-height: var(--lh-snug); letter-spacing: -0.02em;
  font-weight: 600; margin: 0 0 var(--s-4);
}
.section-sub { color: var(--text-muted); max-width: 60ch; margin: 0; font-size: var(--text-md); }

/* ===== Project cards ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: 28px;
  display: flex; flex-direction: column; gap: 16px;
  transition: border-color var(--transition), transform var(--transition);
  position: relative;
}
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.card-head { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; }
.card-org {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em;
}
.card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  letter-spacing: -0.015em;
  font-weight: 600;
  margin: 6px 0 0;
}
.card-desc { color: var(--text-muted); margin: 0; font-size: 15px; }
.card-metrics {
  display: flex; gap: 18px; flex-wrap: wrap;
  padding: 12px 0;
  border-top: 1px dashed var(--border);
  border-bottom: 1px dashed var(--border);
}
.card-metric { display: flex; flex-direction: column; gap: 2px; }
.card-metric-label { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.card-metric-value { font-family: var(--font-display); font-weight: 600; font-size: var(--text-md); letter-spacing: -0.01em; font-variant-numeric: tabular-nums; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-family: var(--font-mono); font-size: 11.5px;
  padding: 4px 8px; border-radius: 4px;
  background: var(--surface-2); color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ===== Timeline ===== */
.timeline {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 0;
}
.tl-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
  position: relative;
}
.tl-item:last-child { border-bottom: 1px solid var(--border); }
.tl-period {
  font-family: var(--font-mono); font-size: 12.5px;
  color: var(--text-muted); display: flex; flex-direction: column; gap: 4px;
}
.tl-period .duration { color: var(--text-faint); font-size: 11.5px; }
.tl-body h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg); font-weight: 600;
  letter-spacing: -0.015em; margin: 0 0 4px;
}
.tl-body .tl-org { color: var(--accent); font-weight: 500; }
.tl-body .tl-loc { color: var(--text-muted); font-family: var(--font-mono); font-size: 12px; margin-left: 8px; }
.tl-body p { color: var(--text-muted); margin: 10px 0 14px; max-width: 70ch; }
.tl-body ul { color: var(--text-muted); margin: 10px 0 14px; padding-left: 18px; max-width: 70ch; }
.tl-body ul li { margin-bottom: 6px; }

/* ===== Skills ===== */
.skills-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.skill-group {
  border: 1px solid var(--border); border-radius: var(--radius-md);
  background: var(--surface); padding: 22px 24px;
}
.skill-group h3 {
  font-family: var(--font-mono); font-size: 11.5px;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em;
  margin: 0 0 12px;
}
.skill-group ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.skill-group .tag { background: transparent; }

/* ===== Posts ===== */
.posts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.post {
  border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 24px; display: flex; flex-direction: column; gap: 12px;
  background: var(--surface);
  transition: border-color var(--transition), transform var(--transition);
}
.post:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.post .post-meta { font-family: var(--font-mono); font-size: 11.5px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; }
.post h3 { font-family: var(--font-display); font-size: var(--text-md); line-height: 1.3; margin: 0; letter-spacing: -0.01em; font-weight: 600; }
.post p { color: var(--text-muted); margin: 0; font-size: 14.5px; }
.post .post-status { color: var(--text-faint); font-family: var(--font-mono); font-size: 11px; }

/* ===== Contact ===== */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start;
}
.contact-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--border); }
.contact-list li { border-bottom: 1px solid var(--border); }
.contact-list a {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 0; text-decoration: none;
  font-family: var(--font-mono); font-size: 13.5px; color: var(--text);
  transition: color var(--transition), padding var(--transition);
}
.contact-list a:hover { color: var(--accent); padding-left: 8px; }
.contact-label { color: var(--text-muted); text-transform: uppercase; font-size: 11px; letter-spacing: 0.1em; }
.contact-value { color: inherit; }

/* ===== Footer ===== */
.site-footer { border-top: 1px solid var(--border); padding-block: 28px; color: var(--text-muted); }
.footer-grid { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; }
.kbd {
  display: inline-block; font-family: var(--font-mono); font-size: 11px;
  padding: 2px 6px; border: 1px solid var(--border); border-bottom-width: 2px;
  border-radius: 4px; background: var(--surface);
  color: var(--text);
}

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .hero { padding-bottom: clamp(48px, 8vw, 96px); }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-card { order: 2; }
  .nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .nav.open {
    display: block; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: 16px;
  }
  .nav.open ul { flex-direction: column; gap: 4px; }
  .nav.open a { display: block; padding: 10px 6px; }
  .cards, .skills-grid, .posts { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .tl-item { grid-template-columns: 1fr; gap: 8px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-stats > div:nth-child(2) { border-right: 0; }
  .hero-stats > div:nth-child(1), .hero-stats > div:nth-child(2) { border-bottom: 1px solid var(--border); }
}
@media (max-width: 540px) {
  .hero-title { font-size: clamp(36px, 11vw, 56px); }
  .term-body { font-size: 12px; padding: 14px; }
  .card { padding: 22px; }
}