/* ==========================================================================
   RAVI PRASHAR (raviprashar.com) — Dark Technical Theme
   Design system: single stylesheet used by every page in the site.
   ========================================================================== */

/* ---- Tokens -------------------------------------------------------------- */
:root {
  /* Surfaces */
  --bg: #090c10;
  --bg-alt: #0d1117;
  --surface: #10151c;
  --surface-raised: #141b24;
  --border: #1f2a37;
  --border-strong: #2b3a4a;

  /* Text */
  --text: #dbe4ec;
  --text-dim: #8ea0b0;
  --text-faint: #5c6b7a;

  /* Accent (terminal green + signal cyan) */
  --accent: #35f2a4;
  --accent-dim: #1c9b6c;
  --accent-glow: rgba(53, 242, 164, 0.18);
  --cyan: #4fc3ff;
  --amber: #ffb454;
  --danger: #ff5d5d;

  /* Type */
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Layout */
  --maxw: 1180px;
  --radius: 6px;
  --radius-lg: 10px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.02) inset, 0 8px 24px rgba(0, 0, 0, 0.35);

  /* Gradients */
  --grad-accent: linear-gradient(135deg, var(--accent) 0%, var(--cyan) 100%);
  --grad-accent-soft: linear-gradient(135deg, rgba(53,242,164,0.16), rgba(79,195,255,0.10));
  --grad-text: linear-gradient(100deg, #ffffff 0%, var(--accent) 55%, var(--cyan) 100%);
  --ease-premium: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- Reset ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--font-mono); line-height: 1.25; margin: 0 0 var(--space-2); color: #fff; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 var(--space-2); color: var(--text-dim); }
p strong, li strong { color: var(--text); }
ul, ol { color: var(--text-dim); padding-left: 1.25rem; }
li { margin-bottom: 0.4rem; }
code, kbd { font-family: var(--font-mono); background: var(--surface-raised); border: 1px solid var(--border); border-radius: 4px; padding: 0.1rem 0.4rem; color: var(--accent); font-size: 0.9em; }
hr { border: none; border-top: 1px solid var(--border); margin: var(--space-4) 0; }
::selection { background: var(--accent); color: #04140d; }

/* Skip link */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--accent); color: #04140d; padding: 0.6rem 1rem; font-family: var(--font-mono); font-weight: 700;
}
.skip-link:focus { left: var(--space-2); top: var(--space-2); }

/* Focus visibility for a11y */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

/* ---- Layout helpers -------------------------------------------------------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--space-3); }
.section {
  padding: var(--space-6) 0; position: relative;
  border-top: 1px solid var(--border);
}
.section::before {
  content: ""; position: absolute; top: -1px; left: 50%; transform: translateX(-50%);
  width: min(280px, 40%); height: 1px; background: var(--grad-accent); opacity: 0.6;
}
.section-tight { padding: var(--space-4) 0; }
.grid { display: grid; gap: var(--space-3); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: var(--space-2);
}
.eyebrow::before { content: "//"; color: var(--text-faint); }

.section-head { max-width: 760px; margin-bottom: var(--space-4); }
.lede { font-size: 1.1rem; color: var(--text-dim); }

/* ---- Buttons ---------------------------------------------------------------- */
.btn {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-weight: 600; font-size: 0.92rem;
  padding: 0.85rem 1.4rem; border-radius: var(--radius); border: 1px solid transparent;
  cursor: pointer; transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn::before {
  content: ""; position: absolute; top: 0; left: -60%; width: 40%; height: 100%;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,0.28), transparent);
  transform: skewX(-20deg); transition: left 0.5s ease;
}
.btn:hover::before { left: 130%; }
.btn-primary {
  background: var(--grad-accent); background-size: 160% auto; background-position: 0% center;
  color: #04140d; transition: background-position 0.4s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary:hover { background-position: 100% center; box-shadow: 0 0 0 3px var(--accent-glow), 0 8px 24px rgba(53,242,164,0.22); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); transform: translateY(-2px); }
.btn-row { display: flex; gap: var(--space-2); flex-wrap: wrap; }

/* ---- Header / Nav ------------------------------------------------------------ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(9, 12, 16, 0.88); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-bar { display: flex; align-items: center; justify-content: space-between; padding: 0.9rem 0; }
.brand { font-family: var(--font-mono); font-weight: 700; color: #fff; font-size: 1.05rem; display: flex; align-items: center; gap: 0.5rem; }
.brand .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.nav-links { display: flex; gap: var(--space-3); list-style: none; margin: 0; padding: 0; align-items: center; }
.nav-links a { position: relative; font-family: var(--font-mono); font-size: 0.9rem; color: var(--text-dim); transition: color 0.2s ease; padding-bottom: 2px; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 100%; height: 1.5px;
  background: var(--grad-accent); transform: scaleX(0); transform-origin: center;
  transition: transform 0.25s var(--ease-premium);
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--accent); text-decoration: none; }
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after { transform: scaleX(1); }
.nav-links a.nav-cta::after { display: none; }
.nav-cta { background: var(--accent); color: #04140d !important; padding: 0.5rem 1rem; border-radius: var(--radius); }
.nav-toggle { display: none; background: transparent; border: 1px solid var(--border-strong); color: var(--text); border-radius: var(--radius); padding: 0.4rem 0.6rem; font-family: var(--font-mono); }
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed; inset: 60px 0 auto 0; flex-direction: column; align-items: flex-start;
    background: var(--bg-alt); border-bottom: 1px solid var(--border); padding: var(--space-3);
    transform: translateY(-120%); transition: transform 0.2s ease; gap: var(--space-2);
  }
  .nav-links.open { transform: translateY(0); }
}
.status-pill {
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent);
  border: 1px solid var(--accent-dim); background: rgba(53,242,164,0.06);
  padding: 0.25rem 0.6rem; border-radius: 999px; display: inline-flex; align-items: center; gap: 0.4rem;
}
.status-pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 1.6s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---- Breadcrumbs -------------------------------------------------------------- */
.breadcrumbs { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-faint); padding: var(--space-2) 0 0; }
.breadcrumbs a { color: var(--text-dim); }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs .sep { margin: 0 0.4rem; color: var(--text-faint); }

/* ---- Hero ---------------------------------------------------------------------- */
.hero {
  padding: var(--space-6) 0 var(--space-5);
  background:
    radial-gradient(circle at 15% 0%, rgba(53,242,164,0.08), transparent 45%),
    radial-gradient(circle at 85% 10%, rgba(79,195,255,0.07), transparent 40%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 42px 42px;
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 75%);
  mask-image: linear-gradient(to bottom, black 0%, transparent 75%);
}
.hero::after {
  content: ""; position: absolute; z-index: 0; pointer-events: none;
  width: 480px; height: 480px; top: -180px; right: -120px; border-radius: 50%;
  background: radial-gradient(circle, rgba(53,242,164,0.14), transparent 70%);
  filter: blur(10px);
  animation: orb-float 14s ease-in-out infinite;
}
.hero > .container { position: relative; z-index: 1; }
@keyframes orb-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 30px) scale(1.08); }
}

.hero h1, .page-hero h1 {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  background-size: 200% auto;
  animation: text-shine 6s var(--ease-premium) infinite, fade-up 0.7s var(--ease-premium) both;
  animation-delay: 0s, 0.05s;
}
@keyframes text-shine {
  0% { background-position: 0% center; }
  50% { background-position: 100% center; }
  100% { background-position: 0% center; }
}

.hero .eyebrow, .page-hero .eyebrow { animation: fade-up 0.6s var(--ease-premium) both; }
.hero .lede, .page-hero .lede { animation: fade-up 0.7s var(--ease-premium) both; animation-delay: 0.1s; }
.hero .btn-row, .page-hero .btn-row { animation: fade-up 0.7s var(--ease-premium) both; animation-delay: 0.18s; }
.hero .stat-row { animation: fade-up 0.7s var(--ease-premium) both; animation-delay: 0.26s; }
.hero .terminal-window { animation: fade-up 0.7s var(--ease-premium) both; animation-delay: 0.2s; }
@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-5); align-items: center; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }
.hero h1 { margin-bottom: var(--space-2); }
.hero .lede { max-width: 60ch; }
.terminal-window {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card); overflow: hidden;
}
.terminal-bar { display: flex; gap: 0.4rem; padding: 0.6rem 0.8rem; background: var(--surface-raised); border-bottom: 1px solid var(--border); }
.terminal-bar span { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.terminal-body { padding: var(--space-2) var(--space-3); font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-dim); }
.terminal-body .line { margin-bottom: 0.35rem; white-space: pre-wrap; }
.terminal-body .prompt { color: var(--accent); }
.terminal-body .out { color: var(--text-faint); }
.terminal-body .key { color: var(--cyan); }
.terminal-body .line:last-child::after {
  content: ""; display: inline-block; width: 7px; height: 1em; margin-left: 2px;
  background: var(--accent); vertical-align: -2px; animation: cursor-blink 1s step-end infinite;
}
@keyframes cursor-blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
.terminal-window { transition: box-shadow 0.3s ease, border-color 0.3s ease; }
.terminal-window:hover { border-color: var(--accent-dim); box-shadow: var(--shadow-card), 0 0 32px rgba(53,242,164,0.08); }

.stat-row { display: flex; gap: var(--space-4); flex-wrap: wrap; margin-top: var(--space-4); }
.stat b { display: block; font-family: var(--font-mono); font-size: 1.8rem; color: var(--accent); }
.stat span { font-size: 0.85rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.06em; }

/* ---- Cards ---------------------------------------------------------------------- */
.card {
  position: relative; overflow: hidden;
  background: rgba(19, 26, 36, 0.72); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: var(--space-3); box-shadow: var(--shadow-card);
  transition: border-color 0.3s var(--ease-premium), transform 0.3s var(--ease-premium), box-shadow 0.3s var(--ease-premium);
}
.card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad-accent); transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s var(--ease-premium);
}
.card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card), 0 0 0 1px var(--accent-dim), 0 16px 32px rgba(53,242,164,0.10);
}
.card:hover::before { transform: scaleX(1); }
.card .num { font-family: var(--font-mono); color: var(--text-faint); font-size: 0.8rem; }
.card h3 { margin-top: 0.4rem; }
.tag-row { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-top: var(--space-2); }
.tag {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim);
  border: 1px solid var(--border-strong); border-radius: 999px; padding: 0.2rem 0.6rem;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.tag:hover { border-color: var(--accent-dim); color: var(--accent); transform: translateY(-1px); }
.tag.accent { color: var(--accent); border-color: var(--accent-dim); }

/* ---- Skills matrix --------------------------------------------------------------- */
.skill-block h3 { display: flex; align-items: center; gap: 0.5rem; font-size: 1rem; }

/* ---- Timeline / process ----------------------------------------------------------- */
.process-list { counter-reset: step; list-style: none; padding: 0; }
.process-list li {
  counter-increment: step; position: relative; padding-left: 3.2rem; margin-bottom: var(--space-3);
}
.process-list li::before {
  content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: 0;
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent);
  border: 1px solid var(--accent-dim); width: 2.2rem; height: 2.2rem; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}

/* ---- FAQ (details/summary) ---------------------------------------------------------- */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: var(--space-2); background: var(--surface); }
.faq-item summary {
  cursor: pointer; padding: var(--space-2) var(--space-3); font-family: var(--font-mono); font-weight: 600; color: var(--text);
  list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--accent); font-size: 1.2rem; }
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-answer { padding: 0 var(--space-3) var(--space-3); color: var(--text-dim); }

/* ---- Tables ---------------------------------------------------------------------------- */
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--border); color: var(--text-dim); }
th { font-family: var(--font-mono); color: var(--text); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; }
tr:hover td { background: rgba(255,255,255,0.015); }

/* ---- Forms ------------------------------------------------------------------------------ */
.form-field { margin-bottom: var(--space-2); }
label { display: block; font-family: var(--font-mono); font-size: 0.85rem; margin-bottom: 0.35rem; color: var(--text); }
input, textarea, select {
  width: 100%; background: var(--surface-raised); border: 1px solid var(--border-strong); color: var(--text);
  border-radius: var(--radius); padding: 0.75rem 0.9rem; font-family: var(--font-sans); font-size: 0.95rem;
}
textarea { min-height: 140px; resize: vertical; }
.form-note { font-size: 0.8rem; color: var(--text-faint); }
.honeypot { position: absolute; left: -9999px; opacity: 0; }

/* ---- Callouts / notes -------------------------------------------------------------------- */
.callout { border-left: 3px solid var(--accent); background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0; padding: var(--space-2) var(--space-3); }
.callout.warn { border-color: var(--amber); }
.callout.placeholder { border-color: var(--danger); }
.callout p:last-child { margin-bottom: 0; }

/* ---- CTA band --------------------------------------------------------------------------- */
.cta-band {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, rgba(53,242,164,0.08), rgba(79,195,255,0.05));
  background-size: 200% 200%; animation: gradient-drift 10s ease infinite;
  border: 1px solid var(--border); border-radius: var(--radius-lg); padding: var(--space-4);
  text-align: center;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0; padding: 1px; border-radius: var(--radius-lg);
  background: var(--grad-accent); opacity: 0.35;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  pointer-events: none;
}
.cta-band h2 { margin-bottom: var(--space-1); }
@keyframes gradient-drift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* ---- Footer ------------------------------------------------------------------------------ */
.site-footer { border-top: 1px solid var(--border); padding: var(--space-5) 0 var(--space-3); background: var(--bg-alt); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-4); }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-faint); }
.footer-grid ul { list-style: none; padding: 0; }
.footer-grid a { color: var(--text-dim); font-size: 0.92rem; }
.footer-grid a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-1);
  border-top: 1px solid var(--border); margin-top: var(--space-4); padding-top: var(--space-3);
  font-size: 0.82rem; color: var(--text-faint); font-family: var(--font-mono);
}

/* ---- Utility ------------------------------------------------------------------------------ */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.page-hero { padding: var(--space-5) 0 var(--space-4); border-bottom: 1px solid var(--border); }
.prose { max-width: 78ch; }
.prose h2 { margin-top: var(--space-4); }
.prose h3 { margin-top: var(--space-3); }
.back-to-top { position: fixed; right: 1.2rem; bottom: 1.2rem; background: var(--surface); border: 1px solid var(--border-strong); color: var(--accent); border-radius: 50%; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); opacity: 0; pointer-events: none; transition: opacity 0.2s ease; }
.back-to-top.show { opacity: 1; pointer-events: auto; }

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

/* ---- Print --------------------------------------------------------------------------------- */
@media print {
  .site-header, .site-footer, .back-to-top, .nav-toggle { display: none; }
  body { background: #fff; color: #000; }
}