/* ==========================================================================
   Shan DevOps Learning Portal - Design System (Zero Horizontal Overflow)
   ========================================================================== */

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

:root {
  /* Canvas & Surfaces */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-hover: #f8fafc;
  --bg-active: #edf2f7;

  /* Text & Content */
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-faint: #94a3b8;
  --text-inverse: #ffffff;

  /* Borders & Dividers */
  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-focus: #2563eb;
  --divider: #f1f5f9;

  /* Primary Brand Accent */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-active: #1e40af;
  --primary-light: #eff6ff;
  --primary-subtle: rgba(37, 99, 235, 0.08);
  --primary-ring: rgba(37, 99, 235, 0.2);

  /* Semantic Palettes */
  --emerald: #059669;
  --emerald-light: #ecfdf5;
  --emerald-border: #a7f3d0;
  
  --amber: #d97706;
  --amber-light: #fffbeb;
  --amber-border: #fde68a;

  --violet: #7c3aed;
  --violet-light: #f5f3ff;
  --violet-border: #ddd6fe;

  --sky: #0284c7;
  --sky-light: #f0f9ff;
  --sky-border: #bae6fd;

  --rose: #e11d48;
  --rose-light: #fff1f2;
  --rose-border: #fecdd3;

  /* Code & Dark Panel Surfaces */
  --code-bg: #0f172a;
  --code-header: #1e293b;
  --code-border: #334155;
  --code-text: #e2e8f0;
  --code-muted: #94a3b8;
  --code-gutter: #475569;
  --code-highlight: #1e293b;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', Menlo, Monaco, Consolas, "Courier New", monospace;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.06), 0 1px 2px -1px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.06);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Container */
  --container-max: 1200px;
}

/* ==========================================================================
   Zero Horizontal Scroll Reset
   ========================================================================== */

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden !important;
  width: 100% !important;
  max-width: 100% !important;
}

body {
  background-color: var(--bg-body);
  color: var(--text-secondary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden !important;
  width: 100% !important;
  max-width: 100% !important;
  position: relative !important;
}

img, svg, video {
  display: block;
  max-width: 100% !important;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

::selection {
  background-color: var(--primary-light);
  color: var(--primary);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.25;
  word-break: break-word !important;
  overflow-wrap: break-word !important;
}

h1 { font-size: clamp(1.75rem, 3.2vw, 2.5rem); font-weight: 800; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.3rem, 2.2vw, 1.75rem); }
h3 { font-size: 1.15rem; }
h4 { font-size: 1rem; }

p {
  line-height: 1.7;
  word-break: break-word !important;
  overflow-wrap: break-word !important;
}

code, pre, kbd {
  font-family: var(--font-mono);
}

code {
  font-size: 0.88em;
  padding: 0.2em 0.4em;
  background-color: var(--bg-subtle);
  color: var(--primary-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  word-break: break-word !important;
}

.mono {
  font-family: var(--font-mono);
}

/* Layout Containers */
.wrap, .container {
  width: 100% !important;
  max-width: var(--container-max) !important;
  margin: 0 auto !important;
  padding: 0 24px !important;
  box-sizing: border-box !important;
  overflow: hidden !important;
}

@media (max-width: 640px) {
  .wrap, .container {
    padding: 0 16px !important;
  }
}

/* ==========================================================================
   Site Header (Zero-Overflow on Mobile)
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  height: auto;
  padding: 6px 0;
  gap: 10px;
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-logo-icon {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.brand-badge {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  background-color: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-sm);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-hover);
}

.nav-link.active {
  color: var(--primary);
  background-color: var(--primary-light);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .nav-links {
    display: none !important;
  }
}

@media (max-width: 480px) {
  .brand-badge {
    display: none !important;
  }
}

/* ==========================================================================
   Buttons & Badges
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  text-decoration: none;
  box-sizing: border-box;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--text-inverse);
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: var(--text-inverse);
}

.btn-secondary {
  background-color: var(--bg-surface);
  border-color: var(--border-medium);
  color: var(--text-primary);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-medium);
  color: var(--primary);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.78rem;
}

.btn-lg {
  padding: 10px 18px;
  font-size: 0.95rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.74rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
  line-height: 1.3;
  white-space: nowrap;
}

.badge-blue { background-color: var(--primary-light); color: var(--primary); border: 1px solid rgba(37, 99, 235, 0.15); }
.badge-emerald, .badge-ok { background-color: var(--emerald-light); color: var(--emerald); border: 1px solid var(--emerald-border); }
.badge-amber, .badge-warn { background-color: var(--amber-light); color: var(--amber); border: 1px solid var(--amber-border); }
.badge-violet, .badge-purple { background-color: var(--violet-light); color: var(--violet); border: 1px solid var(--violet-border); }
.badge-sky { background-color: var(--sky-light); color: var(--sky); border: 1px solid var(--sky-border); }
.badge-gray { background-color: var(--bg-subtle); color: var(--text-muted); border: 1px solid var(--border-subtle); }

/* ==========================================================================
   Code Windows & Terminals (Isolated Horizontal Scroll)
   ========================================================================== */

.code-window, .dark-panel {
  background-color: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-lg);
  overflow: hidden !important;
  box-shadow: var(--shadow-sm);
  position: relative;
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
}

.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background-color: var(--code-header);
  border-bottom: 1px solid var(--code-border);
  font-size: 0.8rem;
  color: var(--code-muted);
  width: 100% !important;
  box-sizing: border-box !important;
}

.code-head .fname {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--code-text);
}

.code-body {
  display: flex;
  overflow-x: auto !important;
  -webkit-overflow-scrolling: touch;
  font-size: 0.84rem;
  line-height: 1.7;
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
}

.gutter {
  padding: 14px 10px;
  text-align: right;
  color: var(--code-gutter);
  user-select: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border-right: 1px solid var(--code-border);
  background-color: rgba(0, 0, 0, 0.2);
  white-space: pre;
  flex-shrink: 0;
}

.code-body pre {
  margin: 0;
  padding: 14px 16px;
  font-family: var(--font-mono);
  color: var(--code-text);
  white-space: pre;
  overflow-x: auto !important;
  -webkit-overflow-scrolling: touch;
  max-width: 100% !important;
  box-sizing: border-box !important;
}

.c-key { color: #60a5fa; font-weight: 500; }
.c-str { color: #86efac; }
.c-cmt { color: #64748b; font-style: italic; }
.c-mod { color: #f472b6; font-weight: 500; }
.c-dash { color: #94a3b8; }
.c-var { color: #fbbf24; }

.term {
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.8;
  overflow-x: auto !important;
  -webkit-overflow-scrolling: touch;
  color: var(--code-text);
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
}

.term .prompt { color: #38bdf8; font-weight: 600; }
.term .path { color: #fbbf24; }
.term .out { color: var(--code-muted); }
.term .ok { color: #4ade80; font-weight: 500; }

.cursor {
  display: inline-block;
  width: 7px;
  height: 13px;
  background-color: var(--primary);
  margin-left: 3px;
  vertical-align: -2px;
  animation: blink 1s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0; } }

/* ==========================================================================
   Tables
   ========================================================================== */

.table-wrap {
  overflow-x: auto !important;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  box-shadow: var(--shadow-xs);
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
  display: block;
}

table {
  width: 100% !important;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
  min-width: 460px;
}

th, td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-subtle);
}

th {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background-color: var(--bg-subtle);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background-color: var(--bg-hover);
}

/* ==========================================================================
   Drawer Component
   ========================================================================== */

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.drawer-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  max-width: 85vw;
  background-color: var(--bg-surface);
  box-shadow: var(--shadow-xl);
  z-index: 100;
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.nav-drawer.active {
  transform: translateX(0);
}

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-subtle);
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
}

.drawer-section-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.drawer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-bottom: 20px;
}

.drawer-nav-item a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.drawer-nav-item a:hover {
  background-color: var(--bg-hover);
  color: var(--primary);
}

.drawer-nav-item.active a {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
  max-width: 90vw;
}

.toast {
  padding: 10px 16px;
  background-color: var(--code-bg);
  color: var(--code-text);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--code-border);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: toastIn 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: auto;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  padding: 40px 0 28px;
  color: var(--text-muted);
  font-size: 0.85rem;
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 32px;
  width: 100% !important;
  box-sizing: border-box !important;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr !important;
    gap: 24px;
  }
}

.footer-col-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
}

/* ==========================================================================
   Unique Topic Highlight Colors
   ========================================================================== */

/* 1. Docker & Containers (Sky Blue) */
.theme-docker, [data-topic="docker"] {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-active: #075985;
  --primary-light: #f0f9ff;
  --primary-border: #bae6fd;
  --primary-ring: rgba(2, 132, 199, 0.2);
  --topic-accent: #0284c7;
}

/* 2. Ansible Automation (Warm Coral / Orange) */
.theme-ansible, [data-topic="ansible"] {
  --primary: #ea580c;
  --primary-hover: #c2410c;
  --primary-active: #9a3412;
  --primary-light: #fff7ed;
  --primary-border: #fed7aa;
  --primary-ring: rgba(234, 88, 12, 0.2);
  --topic-accent: #ea580c;
}

/* 3. Terraform & IaC (HashiCorp Purple / Violet) */
.theme-terraform, [data-topic="terraform"] {
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-active: #5b21b6;
  --primary-light: #f5f3ff;
  --primary-border: #ddd6fe;
  --primary-ring: rgba(124, 58, 237, 0.2);
  --topic-accent: #7c3aed;
}

/* 4. Nagios Monitoring (Monitoring Emerald Green) */
.theme-nagios, [data-topic="nagios"] {
  --primary: #059669;
  --primary-hover: #047857;
  --primary-active: #065f46;
  --primary-light: #ecfdf5;
  --primary-border: #a7f3d0;
  --primary-ring: rgba(5, 150, 105, 0.2);
  --topic-accent: #059669;
}

/* 5. Linux & Shell Script Tasks (Electric Indigo) */
.theme-linux, [data-topic="linux"] {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-active: #3730a3;
  --primary-light: #eef2ff;
  --primary-border: #c7d2fe;
  --primary-ring: rgba(79, 70, 229, 0.2);
  --topic-accent: #4f46e5;
}

/* 6. Jenkins CI/CD Tasks (Pipeline Crimson / Rose) */
.theme-jenkins, [data-topic="jenkins"] {
  --primary: #e11d48;
  --primary-hover: #be123c;
  --primary-active: #9f1239;
  --primary-light: #fff1f2;
  --primary-border: #fecdd3;
  --primary-ring: rgba(225, 29, 72, 0.2);
  --topic-accent: #e11d48;
}