/* ============================================================
   UNTRAMMELED0107 CTF WRITEUPS — MODERN CLEAN DESIGN
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

/* ========== CSS VARIABLES ========== */
:root {
  --bg-primary: #f8f9fb;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-sidebar: #f0f2f5;
  --bg-input: #eef0f3;
  --bg-code: #1e1e2e;
  --bg-code-inline: #e8ecf1;
  
  --border-primary: #e2e6ed;
  --border-card: #eaecf0;
  
  --text-primary: #1a1d23;
  --text-secondary: #5f6774;
  --text-dim: #8b95a1;
  --text-code: #cdd6f4;
  
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-dim: rgba(37, 99, 235, 0.06);
  --accent-glow: rgba(37, 99, 235, 0.12);
  
  --color-web: #2563eb;
  --color-reverse: #dc2626;
  --color-pwn: #7c3aed;
  --color-crypto: #ea580c;
  --color-misc: #16a34a;
  
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.07);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.10);
  
  --transition: 0.2s ease;
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

html[data-scheme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #161b22;
  --bg-sidebar: #0d1117;
  --bg-input: #1c2128;
  --bg-code: #1a1e26;
  --bg-code-inline: #21262d;
  
  --border-primary: #30363d;
  --border-card: #21262d;
  
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-dim: #484f58;
  --text-code: #e6edf3;
  
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-dim: rgba(88, 166, 255, 0.08);
  --accent-glow: rgba(88, 166, 255, 0.15);
}

/* ========== RESET ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-primary); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }
::selection { background: var(--accent); color: #fff; }

/* ========== LAYOUT ========== */
.container {
  display: flex;
  max-width: 1400px;
  margin: 0 auto;
  min-height: 100vh;
}

/* ========== SIDEBAR ========== */
.sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--bg-sidebar);
  padding: 2rem 1.2rem;
  border-right: 1px solid var(--border-primary);
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  z-index: 100;
  transition: background var(--transition), border var(--transition);
  overflow-y: auto;
}

.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 0.4rem; border-radius: var(--radius-sm); }
.hamburger-box { display: block; width: 20px; height: 14px; position: relative; }
.hamburger-inner, .hamburger-inner::before, .hamburger-inner::after {
  display: block; position: absolute; width: 100%; height: 2px;
  background: var(--text-primary); border-radius: 2px; transition: var(--transition);
}
.hamburger-inner { top: 6px; }
.hamburger-inner::before { content: ''; top: -5px; }
.hamburger-inner::after { content: ''; top: 5px; }

.site-avatar { text-align: center; }
.site-avatar a { display: inline-block; }
.site-avatar img {
  width: 80px; height: 80px; border-radius: 50%;
  border: 3px solid var(--border-primary);
  transition: border var(--transition), box-shadow var(--transition);
}
.site-avatar img:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.site-meta { text-align: center; }
.site-name { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.25rem; letter-spacing: -0.3px; }
.site-name a { color: var(--text-primary); }
.site-name a:hover { color: var(--accent); }
.site-description { font-size: 0.7rem; color: var(--text-secondary); font-weight: 400; letter-spacing: 0.3px; }

.menu, .menu-social { list-style: none; display: flex; flex-direction: column; gap: 0.2rem; }
.menu li, .menu-social li {
  display: flex; align-items: center; gap: 0.65rem;
  padding: 0.55rem 0.75rem; border-radius: var(--radius-sm);
  transition: all var(--transition); cursor: pointer;
  font-size: 0.82rem; font-weight: 500;
  color: var(--text-secondary);
}
.menu li:hover, .menu-social li:hover {
  background: var(--accent-dim);
  color: var(--accent);
}
.menu li.current {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 600;
}
.icon { width: 18px; height: 18px; flex-shrink: 0; }
.icon-dark { display: none; }
html[data-scheme="dark"] .icon-dark { display: block; }
html[data-scheme="dark"] .icon-light { display: none; }

#dark-mode-toggle { margin-top: 0.5rem; }

.sidebar-footer {
  margin-top: auto;
  font-size: 0.65rem;
  color: var(--text-dim);
  text-align: center;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border-primary);
}

/* ========== MAIN CONTENT ========== */
.main {
  flex: 1;
  padding: 2.5rem 3rem;
  min-width: 0;
  background: var(--bg-primary);
}

/* Hero */
.hero {
  text-align: center;
  padding: 2rem 0 1.5rem;
}
.hero h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
  letter-spacing: -1px;
}
.hero h2 .accent {
  color: var(--accent);
}
.hero .tagline {
  font-size: 0.92rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Stats */
.stats-row {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin: 2rem 0 2.5rem;
  flex-wrap: wrap;
}
.stat-item {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  padding: 1.2rem 2rem;
  min-width: 140px;
  transition: var(--transition);
}
.stat-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font-mono);
}
.stat-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-secondary);
  margin-top: 0.3rem;
  font-weight: 500;
}

/* Search */
.search-box {
  margin-bottom: 1.5rem;
  position: relative;
}
#search {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-primary);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  outline: none;
  transition: all var(--transition);
}
#search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
#search::placeholder {
  color: var(--text-dim);
}

/* Category Buttons */
.categories, .comp-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.8rem;
}
.cat-btn, .comp-btn {
  padding: 0.45rem 1rem;
  border-radius: 50px;
  border: 1px solid var(--border-primary);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 500;
  font-family: var(--font-sans);
  transition: all var(--transition);
}
.cat-btn:hover, .comp-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}
.cat-btn.active, .comp-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 600;
}

/* ========== ARTICLE LIST ========== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.article-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border-card);
  transition: all var(--transition);
  cursor: pointer;
}
.article-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.article-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  letter-spacing: -0.2px;
}
.article-item:hover .article-title {
  color: var(--accent);
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}
.article-tag {
  padding: 0.2rem 0.58rem;
  border-radius: 4px;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  background: var(--accent-dim);
  color: var(--accent);
}
.article-link-icon {
  margin-left: auto;
  font-size: 1.1rem;
  opacity: 0;
  transform: translateX(-6px);
  transition: all var(--transition);
  color: var(--accent);
}
.article-item:hover .article-link-icon {
  opacity: 1;
  transform: translateX(0);
}

.empty-state {
  text-align: center;
  padding: 4rem 0;
  color: var(--text-dim);
}
.empty-state .icon-large {
  font-size: 2.5rem;
  margin-bottom: 0.8rem;
  opacity: 0.4;
}

/* ========== FOOTER ========== */
.site-footer {
  margin-top: 4rem;
  padding: 1.5rem 0 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.75rem;
  border-top: 1px solid var(--border-primary);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ============================================================
   WRITEUP PAGE STYLES
   ============================================================ */
.wp-content {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}
.wp-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 0.5rem;
  line-height: 1.3;
  color: var(--text-primary);
}
.sub-title {
  font-size: 1.05rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 1rem;
}
.wp-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 0.8rem 0;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-primary);
}
.wp-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* WP Section */
.wp-section {
  margin-bottom: 2.5rem;
}
.wp-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  color: var(--text-primary);
  font-family: var(--font-mono);
  letter-spacing: -0.3px;
}
.wp-section p {
  margin-bottom: 0.85rem;
  line-height: 1.75;
  color: var(--text-primary);
  font-size: 0.95rem;
}

/* IDE / Code Block */
.ide {
  background: var(--bg-code);
  border-radius: var(--radius);
  margin: 1rem 0 1.5rem;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.ide pre {
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-code);
  counter-reset: line;
}
.ide pre .line {
  display: block;
  counter-increment: line;
}
.ide pre .line::before {
  content: counter(line);
  display: inline-block;
  width: 2.5rem;
  margin-right: 1rem;
  text-align: right;
  color: var(--text-dim);
  font-size: 0.78rem;
  user-select: none;
  flex-shrink: 0;
}

/* Inline code (if any) */
code {
  background: var(--bg-code-inline);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--accent);
}

/* Back link on WP pages */
.wp-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1.5rem;
  transition: var(--transition);
}
.wp-back:hover {
  gap: 0.7rem;
}

/* ========== ANIMATIONS ========== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in {
  animation: fadeInUp 0.4s ease-out forwards;
  opacity: 0;
}
.animate-stagger-1 { animation-delay: 0.03s; }
.animate-stagger-2 { animation-delay: 0.06s; }
.animate-stagger-3 { animation-delay: 0.09s; }
.animate-stagger-4 { animation-delay: 0.12s; }
.animate-stagger-5 { animation-delay: 0.15s; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .container { flex-direction: column; }
  .sidebar {
    width: 100%; min-width: 100%; height: auto;
    position: relative; border-right: none;
    border-bottom: 1px solid var(--border-primary);
    padding: 1rem; flex-direction: row; flex-wrap: wrap;
    align-items: center; gap: 0.5rem;
  }
  .hamburger { display: block; }
  .menu, .menu-social { display: none; width: 100%; }
  .sidebar.open .menu, .sidebar.open .menu-social { display: flex; }
  .site-avatar { margin-bottom: 0; }
  .site-avatar img { width: 42px; height: 42px; }
  .site-meta { text-align: left; flex: 1; }
  .site-name { font-size: 0.95rem; }
  .site-description { font-size: 0.6rem; }
  .main { padding: 1.5rem; }
  .hero h2 { font-size: 1.6rem; }
  .stats-row { gap: 0.75rem; }
  .stat-item { padding: 0.8rem 1.2rem; min-width: 90px; }
  .stat-number { font-size: 1.5rem; }
  .wp-title { font-size: 1.4rem; }
  .wp-content { padding: 1rem 0.5rem; }
}
@media (max-width: 500px) {
  .hero h2 { font-size: 1.3rem; }
  .article-item { padding: 1rem; }
  .site-footer { flex-direction: column; text-align: center; }
}