/* =========================================================
   Rahul Maurya — Portfolio
   Modern, minimal, recruiter-focused single-page theme.
   ========================================================= */

/* Light theme (default, recruiter-friendly) */
:root {
  --bg: #ffffff;
  --bg-elev: #ffffff;
  --bg-soft: #f6f8fc;
  --border: #e6eaf2;
  --text: #0b1020;
  --muted: #5a6482;
  --accent: #0ea371;
  --accent-2: #2563eb;
  --chip: #eef2fb;
  --diagram-bg: #f6f8fc;
  --nav-bg: rgba(255, 255, 255, 0.82);
  --hero-glow-1: rgba(14, 163, 113, 0.08);
  --hero-glow-2: rgba(37, 99, 235, 0.08);
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
  --shadow-hover: 0 14px 32px rgba(15, 23, 42, 0.10);
  --radius: 12px;
  --maxw: 1040px;
}

/* Dark theme override */
[data-theme="dark"] {
  --bg: #0b1020;
  --bg-elev: #111735;
  --bg-soft: #0f1530;
  --border: #1f2a4a;
  --text: #e6ecff;
  --muted: #9aa7cc;
  --accent: #7cf5c2;
  --accent-2: #78a6ff;
  --chip: #17204a;
  --diagram-bg: #0a0f24;
  --nav-bg: rgba(11, 16, 32, 0.75);
  --hero-glow-1: rgba(124, 245, 194, 0.08);
  --hero-glow-2: rgba(120, 166, 255, 0.08);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 14px 40px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 600px at 85% -10%, var(--hero-glow-1), transparent 60%),
              radial-gradient(900px 500px at -10% 10%, var(--hero-glow-2), transparent 60%),
              var(--bg);
  transition: background-color .2s ease, color .2s ease;
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent-2); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent); }

strong { color: var(--text); font-weight: 600; }

/* ----------------- Nav ----------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 32px;
  background: var(--nav-bg);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav .brand {
  font-weight: 800;
  letter-spacing: .5px;
  color: var(--text);
  font-size: 18px;
}
.nav .brand span { color: var(--accent); }
.nav nav { display: flex; gap: 22px; flex-wrap: wrap; }
.nav nav a { color: var(--muted); font-weight: 500; font-size: 14px; }
.nav nav a:hover { color: var(--text); }
.nav-cta {
  border: 1px solid var(--accent);
  color: var(--accent) !important;
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  background: transparent;
}
.nav-cta:hover { background: color-mix(in srgb, var(--accent) 12%, transparent); }

/* Theme toggle button (injected by js/theme.js) */
.theme-toggle {
  width: 36px; height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  line-height: 1;
  transition: border-color .15s ease, background .15s ease, transform .1s ease;
  padding: 0;
}
.theme-toggle:hover { border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle svg { width: 18px; height: 18px; }

/* ----------------- Hero ----------------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 110px 32px 80px;
}
.eyebrow {
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  margin: 0 0 16px;
  letter-spacing: .3px;
}
.hero h1 {
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.05;
  margin: 0 0 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero h2 {
  font-size: clamp(22px, 3.2vw, 34px);
  color: var(--muted);
  margin: 0 0 24px;
  font-weight: 600;
  line-height: 1.2;
  max-width: 900px;
}
.accent { color: var(--accent); }
.lede {
  max-width: 760px;
  color: var(--muted);
  font-size: 17px;
  margin: 0 0 32px;
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-links {
  color: var(--muted);
  font-size: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.hero-links span { opacity: .5; }

/* ----------------- Buttons ----------------- */
.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--bg-elev);
  transition: transform .1s ease, border-color .15s ease, background .15s ease;
}
.btn:hover { border-color: var(--accent); color: var(--text); transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 70%, #ffffff));
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 28%, transparent);
}
.btn-primary:hover { color: #ffffff; filter: brightness(1.05); }
[data-theme="dark"] .btn-primary { color: #0b1020; }
[data-theme="dark"] .btn-primary:hover { color: #0b1020; }

/* ----------------- Sections ----------------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px 32px;
  border-top: 1px solid var(--border);
}
.section-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 22px;
  margin: 0 0 32px;
  font-weight: 700;
  color: var(--text);
}
.section-title span {
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
}

/* ----------------- About ----------------- */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 40px;
}
.about-grid p { color: var(--muted); margin: 0 0 14px; }
.about-meta {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  height: fit-content;
}
.about-meta div {
  display: flex;
  flex-direction: column;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  color: var(--text);
  font-size: 14px;
}
.about-meta div:last-child { border-bottom: 0; }
.about-meta span {
  text-transform: uppercase;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 1.2px;
  margin-bottom: 4px;
}

/* ----------------- Skills ----------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.skill-group {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: border-color .15s ease, transform .15s ease;
}
.skill-group:hover { border-color: var(--accent); transform: translateY(-2px); }
.skill-group h4 {
  margin: 0 0 12px;
  font-size: 14px;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  letter-spacing: .3px;
}
.skill-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.skill-group li {
  background: var(--chip);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 12.5px;
}

/* ----------------- Timeline ----------------- */
.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.timeline > li {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 22px 26px;
}
.tl-head {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}
.tl-head h4 { margin: 0; font-size: 17px; font-weight: 700; }
.tl-head h4 span { color: var(--accent); font-weight: 600; }
.tl-date {
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}
.timeline ul { margin: 8px 0 0; padding-left: 18px; color: var(--muted); }
.timeline ul li { margin-bottom: 6px; }

/* ----------------- Projects ----------------- */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.project {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.project:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.project { box-shadow: var(--shadow); }
.project header { display: flex; flex-direction: column; gap: 4px; }
.project h4 { margin: 0; font-size: 17px; font-weight: 700; color: var(--text); }
.project .tag {
  color: var(--accent-2);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
}
.project p { margin: 0; color: var(--muted); font-size: 14.5px; }
.project .problem strong, .project .impact strong { color: var(--text); }
.project .stack {
  list-style: none;
  padding: 0;
  margin: 4px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.project .stack li {
  background: var(--chip);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 9px;
  border-radius: 6px;
  font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
}
.more-projects {
  margin-top: 24px;
  color: var(--muted);
  text-align: center;
  font-size: 14px;
}

/* ----------------- Contact ----------------- */
.contact { text-align: center; }
.contact-lede {
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 26px;
}
.contact-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ----------------- Project links ----------------- */
.project-link { display: block; color: inherit; }
.project-link:hover { color: inherit; }
.project-cta {
  margin-top: 6px;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  font-weight: 600;
}

/* ----------------- Project Detail Pages ----------------- */
.detail-wrap { max-width: 960px; margin: 0 auto; padding: 48px 32px 80px; }
.breadcrumb {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }
.detail-header h1 {
  font-size: clamp(28px, 5vw, 44px);
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}
.detail-header .subtitle {
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  margin: 0 0 20px;
}
.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 24px 0 36px;
}
.meta-grid div { display: flex; flex-direction: column; font-size: 14px; }
.meta-grid span {
  text-transform: uppercase;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 1.2px;
  margin-bottom: 4px;
}
.detail-section { margin: 36px 0; }
.detail-section h2 {
  font-size: 20px;
  color: var(--text);
  margin: 0 0 14px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.detail-section h2::before {
  content: "";
  width: 22px; height: 2px;
  background: var(--accent);
  display: inline-block;
}
.detail-section p, .detail-section li { color: var(--muted); }
.detail-section ul { padding-left: 20px; }
.detail-section ul li { margin-bottom: 6px; }
.detail-section strong { color: var(--text); }
.diagram {
  background: var(--diagram-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin: 14px 0;
  overflow-x: auto;
}
.diagram pre.mermaid { background: transparent; color: var(--text); margin: 0; font-family: 'JetBrains Mono', monospace; font-size: 13px; }
.callout {
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  padding: 14px 18px;
  border-radius: 0 10px 10px 0;
  color: var(--text);
  margin: 16px 0;
}
.stack-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.stack-row li {
  list-style: none;
  background: var(--chip);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
}

/* ----------------- Projects index page ----------------- */
.projects-index { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; }

/* ----------------- Footer ----------------- */
.footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 28px 16px;
  color: var(--muted);
  font-size: 13px;
  margin-top: 40px;
}

/* ----------------- Responsive ----------------- */
@media (max-width: 820px) {
  .about-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .nav { padding: 12px 18px; }
  .nav nav { display: none; }
  .hero { padding: 72px 20px 48px; }
  .section { padding: 56px 20px; }
  .tl-head { flex-direction: column; }
}
@media (max-width: 480px) {
  .skills-grid { grid-template-columns: 1fr; }
}