/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary:    #0d1117;
  --bg-secondary:  #161b22;
  --bg-tertiary:   #1c2128;
  --bg-card:       #21262d;
  --bg-hover:      #30363d;
  --border:        #30363d;
  --border-light:  #484f58;

  --text-primary:  #e6edf3;
  --text-secondary:#8b949e;
  --text-muted:    #6e7681;

  --accent-blue:   #58a6ff;
  --accent-green:  #3fb950;
  --accent-yellow: #d29922;
  --accent-red:    #f85149;
  --accent-purple: #bc8cff;
  --accent-orange: #ffa657;
  --accent-teal:   #39d353;

  --code-bg:       #161b22;
  --code-border:   #30363d;

  --sidebar-w:     280px;
  --header-h:      56px;
  --radius:        8px;
  --radius-sm:     4px;
  --transition:    0.15s ease;
}

html { scroll-behavior: smooth; font-size: 15px; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--bg-hover); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* ===== HEADER ===== */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 1.5rem;
  gap: 1rem;
}

.header-logo {
  display: flex; align-items: center; gap: 0.6rem;
  font-weight: 700; font-size: 1rem; color: var(--text-primary);
  text-decoration: none;
}
.header-logo .logo-icon {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, #58a6ff, #bc8cff);
  border-radius: 6px;
  display: grid; place-items: center;
  font-size: 14px;
}
.header-subtitle {
  color: var(--text-secondary);
  font-size: 0.8rem;
  border-left: 1px solid var(--border);
  padding-left: 1rem;
  margin-left: 0.2rem;
}
.header-badge {
  margin-left: auto;
  background: rgba(88,166,255,0.15);
  color: var(--accent-blue);
  border: 1px solid rgba(88,166,255,0.3);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

#hamburger {
  display: none;
  background: none; border: none; cursor: pointer;
  color: var(--text-secondary); font-size: 1.3rem; padding: 4px;
}

/* ===== LAYOUT ===== */
.layout {
  display: flex;
  margin-top: var(--header-h);
  min-height: calc(100vh - var(--header-h));
}

/* ===== SIDEBAR ===== */
.sidebar {
  position: fixed;
  top: var(--header-h); bottom: 0; left: 0;
  width: var(--sidebar-w);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 1rem 0;
  z-index: 50;
  transition: transform var(--transition);
}

.sidebar-section-title {
  padding: 0.8rem 1.2rem 0.3rem;
  font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.sidebar nav a {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.45rem 1.2rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  border-radius: 0;
  transition: all var(--transition);
  border-left: 2px solid transparent;
}
.sidebar nav a:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-left-color: var(--border-light);
}
.sidebar nav a.active {
  color: var(--accent-blue);
  background: rgba(88,166,255,0.08);
  border-left-color: var(--accent-blue);
}
.sidebar nav a .nav-icon { font-size: 0.95rem; width: 18px; text-align: center; }
.sidebar nav a .nav-badge {
  margin-left: auto;
  background: var(--bg-hover);
  color: var(--text-muted);
  font-size: 0.65rem;
  padding: 1px 6px;
  border-radius: 10px;
  font-weight: 600;
}

.sidebar-overlay {
  display: none;
  position: fixed; inset: 0; z-index: 40;
  background: rgba(0,0,0,0.5);
}

/* ===== MAIN CONTENT ===== */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 2rem;
  max-width: calc(100% - var(--sidebar-w));
}

/* ===== SEARCH BAR ===== */
.search-wrap {
  margin-bottom: 2rem;
  position: relative;
}
.search-wrap input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 0.65rem 1rem 0.65rem 2.8rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}
.search-wrap input:focus { border-color: var(--accent-blue); }
.search-wrap input::placeholder { color: var(--text-muted); }
.search-icon {
  position: absolute; left: 0.9rem; top: 50%; transform: translateY(-50%);
  color: var(--text-muted); font-size: 0.9rem;
  pointer-events: none;
}

/* ===== SECTIONS ===== */
.section { margin-bottom: 3rem; }

.section-header {
  display: flex; align-items: center; gap: 0.8rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border);
}
.section-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  display: grid; place-items: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.section-header h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}
.section-header .section-tag {
  margin-left: auto;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
}

/* ===== CARDS ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.2rem;
  overflow: hidden;
}
.card-header {
  padding: 0.9rem 1.2rem;
  display: flex; align-items: center; gap: 0.6rem;
  cursor: pointer;
  user-select: none;
  transition: background var(--transition);
}
.card-header:hover { background: var(--bg-hover); }
.card-title { font-weight: 600; font-size: 0.95rem; color: var(--text-primary); }
.card-subtitle { font-size: 0.8rem; color: var(--text-secondary); margin-top: 1px; }
.card-chevron {
  margin-left: auto;
  color: var(--text-muted);
  font-size: 0.8rem;
  transition: transform var(--transition);
}
.card.open .card-chevron { transform: rotate(90deg); }
.card-body { padding: 0 1.2rem 1.2rem; display: none; }
.card.open .card-body { display: block; }

/* ===== TABS ===== */
.tabs { display: flex; gap: 2px; margin-bottom: 1rem; border-bottom: 1px solid var(--border); }
.tab-btn {
  background: none; border: none; cursor: pointer;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  font-size: 0.85rem; font-weight: 500;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all var(--transition);
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--accent-blue); border-bottom-color: var(--accent-blue); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== CODE BLOCKS ===== */
.code-block {
  position: relative;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-sm);
  margin: 0.8rem 0;
  overflow: hidden;
}
.code-block-header {
  display: flex; align-items: center;
  padding: 0.4rem 0.8rem;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem;
}
.code-block-label {
  color: var(--text-muted);
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}
.code-block-mode {
  margin-left: 0.5rem;
  padding: 1px 6px;
  border-radius: 10px;
  font-size: 0.68rem;
  font-weight: 700;
}
.mode-global { background: rgba(63,185,80,0.15); color: var(--accent-green); }
.mode-interface { background: rgba(88,166,255,0.15); color: var(--accent-blue); }
.mode-config { background: rgba(188,140,255,0.15); color: var(--accent-purple); }
.mode-exec { background: rgba(255,166,87,0.15); color: var(--accent-orange); }
.mode-verify { background: rgba(57,211,83,0.15); color: var(--accent-teal); }

.copy-btn {
  margin-left: auto;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex; align-items: center; gap: 4px;
}
.copy-btn:hover { background: var(--accent-blue); color: white; border-color: var(--accent-blue); }
.copy-btn.copied { background: var(--accent-green); color: white; border-color: var(--accent-green); }

.code-block pre {
  padding: 1rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--text-primary);
  white-space: pre;
}

/* Syntax highlighting classes */
.c-cmd   { color: #79c0ff; }   /* commands */
.c-kw    { color: #ff7b72; }   /* keywords (no, ip, etc) */
.c-val   { color: #a5d6ff; }   /* values/names */
.c-num   { color: #ffa657; }   /* numbers/IPs */
.c-com   { color: #8b949e; font-style: italic; } /* comments */
.c-prompt{ color: #3fb950; }   /* router prompt */
.c-warn  { color: #d29922; }   /* warnings */

/* ===== CALLOUT BOXES ===== */
.callout {
  display: flex; gap: 0.8rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-sm);
  margin: 0.8rem 0;
  font-size: 0.88rem;
  line-height: 1.55;
}
.callout-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }
.callout-content strong { display: block; margin-bottom: 0.2rem; font-size: 0.85rem; }

.callout.tip      { background: rgba(88,166,255,0.08); border-left: 3px solid var(--accent-blue); }
.callout.warning  { background: rgba(210,153,34,0.1);  border-left: 3px solid var(--accent-yellow); }
.callout.danger   { background: rgba(248,81,73,0.1);   border-left: 3px solid var(--accent-red); }
.callout.success  { background: rgba(63,185,80,0.08);  border-left: 3px solid var(--accent-green); }
.callout.exam     { background: rgba(188,140,255,0.1); border-left: 3px solid var(--accent-purple); }

/* ===== TABLES ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin: 0.8rem 0;
}
.data-table th {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
  text-align: left;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--border);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.data-table td {
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: top;
}
.data-table tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
.data-table code {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.8rem;
  color: var(--accent-blue);
  background: rgba(88,166,255,0.1);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ===== STEP LIST ===== */
.steps { list-style: none; padding: 0; counter-reset: steps; }
.steps li {
  counter-increment: steps;
  display: flex; gap: 0.8rem;
  margin-bottom: 0.6rem;
  align-items: flex-start;
}
.steps li::before {
  content: counter(steps);
  min-width: 24px; height: 24px;
  background: var(--accent-blue);
  color: #000;
  border-radius: 50%;
  font-size: 0.72rem; font-weight: 700;
  display: grid; place-items: center;
  flex-shrink: 0;
  margin-top: 1px;
}
.steps li span { font-size: 0.88rem; color: var(--text-secondary); }
.steps li span strong { color: var(--text-primary); }

/* ===== INLINE CODE ===== */
code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.82em;
  background: rgba(88,166,255,0.1);
  color: var(--accent-blue);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ===== CHECKLIST ===== */
.checklist { list-style: none; padding: 0; }
.checklist li {
  display: flex; align-items: flex-start; gap: 0.6rem;
  padding: 0.35rem 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.checklist li:last-child { border-bottom: none; }
.checklist li::before {
  content: '☐';
  color: var(--accent-blue);
  font-size: 1rem;
  flex-shrink: 0;
}

/* ===== PROGRESS / HERO ===== */
.hero-section {
  background: linear-gradient(135deg, rgba(88,166,255,0.08), rgba(188,140,255,0.06));
  border: 1px solid rgba(88,166,255,0.2);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin-bottom: 2rem;
  display: flex; gap: 2rem; align-items: center;
}
.hero-text h1 { font-size: 1.6rem; font-weight: 800; margin-bottom: 0.4rem; }
.hero-text h1 span { color: var(--accent-blue); }
.hero-text p { color: var(--text-secondary); font-size: 0.9rem; max-width: 550px; }
.hero-stats {
  margin-left: auto;
  display: flex; gap: 1.5rem;
  flex-shrink: 0;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 1.8rem; font-weight: 800; color: var(--accent-blue); line-height: 1; }
.hero-stat .lbl { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

/* ===== COLOR ACCENTS PER SECTION ===== */
.s-vlan   .section-icon { background: rgba(88,166,255,0.15);  color: var(--accent-blue); }
.s-vlan   .section-tag  { background: rgba(88,166,255,0.15);  color: var(--accent-blue); }
.s-inter  .section-icon { background: rgba(188,140,255,0.15); color: var(--accent-purple); }
.s-inter  .section-tag  { background: rgba(188,140,255,0.15); color: var(--accent-purple); }
.s-dhcp   .section-icon { background: rgba(63,185,80,0.15);   color: var(--accent-green); }
.s-dhcp   .section-tag  { background: rgba(63,185,80,0.15);   color: var(--accent-green); }
.s-mgmt   .section-icon { background: rgba(255,166,87,0.15);  color: var(--accent-orange); }
.s-mgmt   .section-tag  { background: rgba(255,166,87,0.15);  color: var(--accent-orange); }
.s-sec    .section-icon { background: rgba(248,81,73,0.15);   color: var(--accent-red); }
.s-sec    .section-tag  { background: rgba(248,81,73,0.15);   color: var(--accent-red); }
.s-ref    .section-icon { background: rgba(57,211,83,0.15);   color: var(--accent-teal); }
.s-ref    .section-tag  { background: rgba(57,211,83,0.15);   color: var(--accent-teal); }

/* ===== GRID ===== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
.grid-2 .card { margin-bottom: 0; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }
  .sidebar-overlay.open { display: block; }
  .main-content { margin-left: 0; max-width: 100%; }
  #hamburger { display: block; }
  .hero-section { flex-direction: column; gap: 1rem; }
  .hero-stats { margin-left: 0; }
  .grid-2 { grid-template-columns: 1fr; }
}