/* ==========================================================================
   Coding IndiaTrend — Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=JetBrains+Mono:wght@400;500;700&family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* Light theme (default) */
  --bg: #F7F5F0;
  --surface: #FFFFFF;
  --surface-alt: #EFEBE2;
  --text: #14151A;
  --muted: #5B5F6B;
  --border: #E1DCCF;
  --code-bg: #12151C;
  --code-text: #E9E9EC;

  --signal: #2A5FE0;
  --signal-ink: #1C3F99;
  --mint: #1C9A5B;
  --amber: #B4690E;

  --py-accent: #2A5FE0;
  --c-accent: #5B5F6B;
  --cpp-accent: #B4690E;

  --radius-s: 4px;
  --radius-m: 8px;
  --radius-l: 14px;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --shadow: 0 1px 2px rgba(20,21,26,0.06), 0 4px 16px rgba(20,21,26,0.06);
  --max-width: 1180px;
}

[data-theme="dark"] {
  --bg: #0E1015;
  --surface: #171A21;
  --surface-alt: #1E222B;
  --text: #EDEDEF;
  --muted: #9497A3;
  --border: #2B2F3A;
  --code-bg: #0A0C10;
  --code-text: #E9E9EC;

  --signal: #6C93FF;
  --signal-ink: #A9C0FF;
  --mint: #4ADE80;
  --amber: #F5A623;

  --py-accent: #6C93FF;
  --c-accent: #9497A3;
  --cpp-accent: #F5A623;

  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.35);
}

/* ---- Reset ---- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s ease, color 0.2s ease;
}
img { max-width: 100%; display: block; border-radius: var(--radius-m); }
a { color: inherit; text-decoration: none; }
ul { padding-left: 0; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
}
p { margin: 0 0 1em; color: var(--text); }
::selection { background: var(--signal); color: #fff; }

/* Focus states for accessibility */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---- Header / Nav ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand span { color: var(--signal); }

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  align-items: center;
}
.nav-links a {
  font-size: 0.96rem;
  color: var(--muted);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  border-color: var(--signal);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle, .menu-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.menu-toggle { display: none; }

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}
.search-box input {
  width: 190px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font-body);
}
.search-results {
  position: absolute;
  top: 46px;
  right: 0;
  width: 320px;
  max-height: 360px;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow);
  display: none;
  z-index: 50;
}
.search-results.open { display: block; }
.search-results a {
  display: block;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.search-results a:last-child { border-bottom: none; }
.search-results a:hover { background: var(--surface-alt); }
.search-results .sr-lang { color: var(--muted); font-size: 0.78rem; }
.search-empty { padding: 14px; color: var(--muted); font-size: 0.88rem; }

/* Mobile nav drawer */
.mobile-drawer {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 24px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.mobile-drawer.open { display: flex; }
.mobile-drawer a {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 1rem;
}
.mobile-drawer a:last-child { border-bottom: none; }

/* ---- Hero ---- */
.hero {
  padding: 88px 0 72px;
  border-bottom: 1px solid var(--border);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  letter-spacing: -0.02em;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 46ch;
  margin-bottom: 2em;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: var(--radius-m);
  font-size: 0.97rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.12s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--signal); color: #fff; }
.btn-primary:hover { background: var(--signal-ink); }
.btn-secondary { background: var(--surface); border-color: var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--surface-alt); }

/* Terminal mock in hero */
.terminal {
  background: var(--code-bg);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow);
  overflow: hidden;
  font-family: var(--font-mono);
}
.terminal-bar {
  display: flex;
  gap: 7px;
  padding: 12px 16px;
  background: rgba(255,255,255,0.04);
}
.terminal-dot { width: 11px; height: 11px; border-radius: 50%; background: #4b4f5a; }
.terminal-dot:nth-child(1) { background: #E9564F; }
.terminal-dot:nth-child(2) { background: #E9B64F; }
.terminal-dot:nth-child(3) { background: #4FE97C; }
.terminal-body {
  padding: 20px 22px 26px;
  color: var(--code-text);
  font-size: 0.88rem;
  line-height: 1.7;
}
.terminal-body .c-comment { color: #7A8194; }
.terminal-body .c-kw { color: #C48CFF; }
.terminal-body .c-str { color: #91E29B; }
.terminal-body .c-fn { color: #6FB4FF; }

/* ---- Sections ---- */
.section { padding: 72px 0; }
.section-alt { background: var(--surface); }
.section-head { max-width: 60ch; margin-bottom: 40px; }
.section-head h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
.section-head p { color: var(--muted); font-size: 1.05rem; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--signal);
  margin-bottom: 10px;
  display: block;
}

/* Language cards on homepage — distinct per language, not identical */
.lang-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.lang-card {
  border-radius: var(--radius-l);
  padding: 32px 28px;
  border: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  min-height: 250px;
}
.lang-card.python { border-top: 4px solid var(--py-accent); }
.lang-card.c { border-top: 4px solid var(--c-accent); }
.lang-card.cpp { border-top: 4px solid var(--cpp-accent); }
.lang-card h3 { font-size: 1.4rem; margin-bottom: 0.4em; }
.lang-card p { color: var(--muted); flex-grow: 1; }
.lang-card .btn { align-self: flex-start; margin-top: 12px; padding: 10px 18px; font-size: 0.9rem; }
.lang-card.python .btn { background: var(--py-accent); color: #fff; }
.lang-card.c .btn { background: var(--c-accent); color: #fff; }
.lang-card.cpp .btn { background: var(--cpp-accent); color: #fff; }

/* Why learn grid */
.reason-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 4px 32px;
}
.reason-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.reason-num {
  font-family: var(--font-mono);
  color: var(--signal);
  font-size: 0.85rem;
  padding-top: 3px;
}
.reason-item h4 { font-size: 1.02rem; margin-bottom: 0.2em; }
.reason-item p { color: var(--muted); font-size: 0.92rem; margin: 0; }

/* Roadmap */
.roadmap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  max-width: 440px;
}
.roadmap-step {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 0;
}
.roadmap-step .dot {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  flex-shrink: 0;
}
.roadmap-step.active .dot { background: var(--signal); color: #fff; border-color: var(--signal); }
.roadmap-step span.label { font-weight: 500; }
.roadmap-connector {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin-left: 17px;
}

/* FAQ */
.faq-list { max-width: 74ch; }
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text);
}
.faq-q .icon { color: var(--signal); font-family: var(--font-mono); font-size: 1.1rem; }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
  color: var(--muted);
}
.faq-a p { padding-bottom: 18px; }
.faq-item.open .faq-a { max-height: 400px; }

/* ---- Language page layout ---- */
.page-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--border);
}
.breadcrumbs {
  font-size: 0.86rem;
  color: var(--muted);
  margin-bottom: 14px;
}
.breadcrumbs a { color: var(--signal); }
.breadcrumbs .sep { margin: 0 8px; }
.page-header h1 { font-size: clamp(2rem, 4vw, 2.8rem); }
.page-lede { color: var(--muted); font-size: 1.1rem; max-width: 64ch; }

.doc-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 100px;
  align-items: start;
}
.toc {
  position: sticky;
  top: 90px;
  font-size: 0.88rem;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
}
.toc-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 12px;
  display: block;
}
.toc ol {
  list-style: none;
  padding: 0; margin: 0;
  counter-reset: toc;
}
.toc li { counter-increment: toc; }
.toc a {
  display: block;
  padding: 6px 0 6px 10px;
  border-left: 2px solid var(--border);
  color: var(--muted);
}
.toc a:hover, .toc a.active {
  color: var(--signal);
  border-left-color: var(--signal);
}

.doc-content section { margin-bottom: 52px; scroll-margin-top: 90px; }
.doc-content h2 { font-size: 1.55rem; margin-top: 0; }
.doc-content h3 { font-size: 1.15rem; margin-top: 1.2em; }
.doc-content p { color: var(--text); max-width: 74ch; }
.doc-content ul, .doc-content ol { max-width: 74ch; color: var(--text); margin-bottom: 1em; padding-left: 22px; }
.doc-content li { margin-bottom: 0.4em; }

/* code blocks */
.code-block {
  position: relative;
  background: var(--code-bg);
  border-radius: var(--radius-m);
  margin: 20px 0;
  overflow: hidden;
  font-family: var(--font-mono);
}
.code-block-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  background: rgba(255,255,255,0.04);
  font-size: 0.78rem;
  color: #9497A3;
}
.copy-btn {
  background: rgba(255,255,255,0.08);
  border: none;
  color: #E9E9EC;
  font-size: 0.76rem;
  padding: 5px 10px;
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
}
.copy-btn:hover { background: rgba(255,255,255,0.16); }
.copy-btn.copied { background: var(--mint); color: #06251A; }
.code-block pre {
  margin: 0;
  padding: 16px 18px 20px;
  overflow-x: auto;
  color: var(--code-text);
  font-size: 0.88rem;
  line-height: 1.65;
}
.code-block code { font-family: var(--font-mono); }

/* data type / table chips */
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 20px; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 6px 12px;
  border-radius: var(--radius-s);
  background: var(--surface-alt);
  border: 1px solid var(--border);
}

table.ref-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 0.92rem;
}
table.ref-table th, table.ref-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
table.ref-table th { color: var(--muted); font-weight: 600; font-size: 0.82rem; }

.img-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 20px 0;
}
.img-row figure { margin: 0; }
.img-row img { width: 100%; height: 160px; object-fit: cover; }
.img-row figcaption {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 6px;
}

.callout {
  border-left: 3px solid var(--signal);
  background: var(--surface-alt);
  padding: 14px 18px;
  border-radius: var(--radius-s);
  margin: 18px 0;
  font-size: 0.94rem;
}

.internal-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.internal-links a {
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  font-size: 0.9rem;
  color: var(--signal);
}
.internal-links a:hover { background: var(--surface-alt); }

/* Project idea list */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.project-item {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  background: var(--surface);
}
.project-item h4 { font-size: 1rem; margin-bottom: 0.3em; }
.project-item p { font-size: 0.9rem; color: var(--muted); margin: 0; }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 56px 0 32px;
  background: var(--surface);
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand h3 { font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 0.4em; }
.footer-brand p { color: var(--muted); max-width: 34ch; font-size: 0.92rem; }
.footer-links { display: flex; gap: 60px; }
.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 12px;
  font-weight: 500;
}
.footer-col a {
  display: block;
  padding: 5px 0;
  font-size: 0.92rem;
  color: var(--text);
}
.footer-col a:hover { color: var(--signal); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---- 404 ---- */
.page-404 {
  text-align: left;
  padding: 100px 0 140px;
}
.page-404 .code {
  font-family: var(--font-mono);
  color: var(--signal);
  font-size: 0.95rem;
  margin-bottom: 12px;
}
.page-404 h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .doc-layout { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; margin-bottom: 20px; }
  .hero-grid { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .lang-grid { grid-template-columns: 1fr; }
  .img-row { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links, .search-box { display: none; }
  .menu-toggle { display: flex; }
  .footer-grid { flex-direction: column; }
  .footer-links { gap: 32px; }
}
@media (max-width: 480px) {
  body { font-size: 16px; }
  .container { padding: 0 18px; }
  .img-row { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 48px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}