/* ============================================
   writeups.sh — main stylesheet
   ============================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #0d1117;
  --bg-raised:  #161b22;
  --border:     #21262d;
  --text:       #e6edf3;
  --text-muted: #8b949e;
  --text-dim:   #484f58;
  --blue:       #58a6ff;
  --green:      #3fb950;
  --amber:      #d29922;
  --red:        #f85149;
  --font-mono:  'JetBrains Mono', monospace;
  --font-sans:  'Syne', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

a { color: inherit; text-decoration: none; }

/* ── Nav ── */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--blue);
  letter-spacing: 0.02em;
}
.nav-logo span { color: var(--green); }

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  width: 200px;
  cursor: pointer;
  transition: border-color 0.2s;
}
.search-bar:hover { border-color: var(--text-muted); }
.search-bar .prompt { color: var(--green); }

/* ── Search modal ── */
.search-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  z-index: 999;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
}
.search-modal.hidden { display: none; }
.search-modal-inner {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  width: 100%;
  max-width: 600px;
}
.search-close {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  background: none;
  border: none;
  cursor: pointer;
  margin-top: 1rem;
  letter-spacing: 0.05em;
}

/* ── Hero ── */
.hero {
  padding: 4rem 2rem 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--green);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(32px, 5vw, 46px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1rem;
}
.hero-title em { font-style: normal; color: var(--blue); }

.hero-sub {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 2rem;
}

/* ── Tag strip ── */
.tag-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid;
  cursor: pointer;
  transition: opacity 0.2s;
}
.tag:hover { opacity: 0.8; }
.tag-gray  { color: var(--text-muted); border-color: #8b949e40; background: #8b949e10; }
.tag-green { color: var(--green);      border-color: #3fb95040; background: #3fb95010; }
.tag-blue  { color: var(--blue);       border-color: #58a6ff40; background: #58a6ff10; }
.tag-amber { color: var(--amber);      border-color: #d2992240; background: #d2992210; }
.tag-red   { color: var(--red);        border-color: #f8514940; background: #f8514910; }

/* ── Writeups section ── */
.writeups-section {
  max-width: 900px;
  margin: 0 auto 3rem;
  padding: 0 2rem;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
  border-left: 2px solid var(--green);
  padding-left: 10px;
}

/* ── Cards grid ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

/* Cap at 3 columns (2 rows × 3 = max 6 cards) */
@media (min-width: 800px) {
  .cards-grid:not(.cards-1) { grid-template-columns: repeat(3, 1fr); }
}


.cards-1 {
  grid-template-columns: minmax(250px, 380px) !important;
  background: transparent !important;
  border-color: transparent !important;
  width: fit-content;
}

/* Two cards: side by side, contained */
@media (min-width: 600px) {
  .cards-2 { grid-template-columns: repeat(2, 1fr) !important; max-width: 560px; }
}

.card {
  background: var(--bg);
  padding: 1.25rem;
  transition: background 0.15s;
  position: relative;
  display: block;
}
.card:hover { background: var(--bg-raised); }

.card-accent {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
}
.accent-academy { background: var(--blue); }
.accent-easy   { background: var(--green); }
.accent-medium { background: var(--amber); }
.accent-hard   { background: var(--red); }

.card-inner { padding-left: 10px; }

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.card-platform {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.diff-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 3px;
}
.diff-easy   { color: var(--green); background: #3fb95018; }
.diff-medium { color: var(--amber); background: #d2992218; }
.diff-hard   { color: var(--red);   background: #f8514918; }

.card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}

.card-os {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--blue);
  margin-bottom: 8px;
}

.card-stuck {
  font-size: 12px;
  color: #6e7681;
  font-style: italic;
  margin-bottom: 10px;
  line-height: 1.5;
  border-left: 1px solid var(--border);
  padding-left: 8px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 3px;
}

/* ── Coming soon ── */
.coming-soon {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  padding: 1rem 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
.coming-soon .prompt { color: var(--green); }

/* ── Stuck banner ── */
.stuck-banner {
  max-width: 900px;
  margin: 0 auto 3rem;
  padding: 0 2rem;
}

.stuck-banner > div {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-left: 3px solid var(--blue);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.stuck-icon {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--blue);
  margin-top: 2px;
  flex-shrink: 0;
}

.stuck-text h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.stuck-text p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── Writeup page ── */
.writeup-header {
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 2rem;
}

.writeup-header-inner {
  max-width: 860px;
  margin: 0 auto;
}

.writeup-breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 1rem;
  display: flex;
  gap: 6px;
  align-items: center;
}
.writeup-breadcrumb a { color: var(--blue); }
.writeup-breadcrumb a:hover { text-decoration: underline; }

.writeup-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 1rem;
}

.writeup-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 1rem;
}

.meta-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-raised);
}
.meta-pill.diff-easy   { color: var(--green); border-color: #3fb95040; background: #3fb95010; }
.meta-pill.diff-medium { color: var(--amber); border-color: #d2992240; background: #d2992210; }
.meta-pill.diff-hard   { color: var(--red);   border-color: #f8514940; background: #f8514910; }

.writeup-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.writeup-tags .card-tag { color: var(--blue); }

/* ── Writeup body (markdown content) ── */
.writeup-body {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

.writeup-body h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.writeup-body h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.writeup-body p { margin-bottom: 1rem; }

.writeup-body a { color: var(--blue); text-decoration: underline; }

.writeup-body code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--green);
}

.writeup-body pre {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: visible;
  white-space: pre-wrap;
  word-break: break-all;
  margin: 1.25rem 0;
}

.writeup-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
  line-height: 1.6;
}

.writeup-body ol, .writeup-body ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.writeup-body li { margin-bottom: 0.25rem; }

/* Spoiler / flag reveal */
.writeup-body details {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  cursor: pointer;
}

.writeup-body summary {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  user-select: none;
  list-style: none;
}
.writeup-body summary::before { content: "▶ "; color: var(--green); font-size: 10px; }
.writeup-body details[open] summary::before { content: "▼ "; }

.writeup-body details[open] {
  border-color: var(--green);
}

.writeup-body details p {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--green);
  user-select: text;
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  margin-top: auto;
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

.footer-note {
  font-size: 12px;
  color: var(--text-dim);
}
.footer-note a { color: var(--text-muted); }
.footer-note a:hover { color: var(--text); }

/* ── Responsive ── */
@media (max-width: 600px) {
  .nav { padding: 1rem; flex-wrap: wrap; gap: 0.75rem; }
  .search-bar { width: 100%; order: 3; }
  .hero { padding: 2rem 1rem; }
  .writeups-section { padding: 0 1rem; }
  .stuck-banner { padding: 0 1rem; }
  .writeup-header { padding: 1.5rem 1rem; }
  .writeup-body { padding: 1.5rem 1rem 3rem; }
}