/* ===================================================
   ArchKB — Premium Knowledge Base Website Styles
   =================================================== */

/* === CSS VARIABLES === */
:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #0f1420;
  --bg-card: #131926;
  --bg-card-hover: #1a2233;
  --bg-sidebar: #0c1018;
  --border: rgba(255,255,255,0.08);
  --border-active: rgba(99,179,237,0.4);

  --text-primary: #e8edf5;
  --text-secondary: #8fa3c0;
  --text-muted: #4a6080;

  --accent: #4f9ef8;
  --accent-glow: rgba(79,158,248,0.2);
  --accent-gradient: linear-gradient(135deg, #4f9ef8 0%, #a78bfa 100%);

  --green: #34d399;
  --yellow: #fbbf24;
  --red: #f87171;
  --purple: #a78bfa;
  --orange: #fb923c;
  --teal: #2dd4bf;

  --sidebar-width: 280px;
  --topbar-height: 64px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;

  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px rgba(79,158,248,0.15);

  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light mode */
[data-theme="light"] {
  --bg-primary: #f0f4fc;
  --bg-secondary: #e8edf8;
  --bg-card: #ffffff;
  --bg-card-hover: #f5f8ff;
  --bg-sidebar: #1a2340;
  --border: rgba(0,0,0,0.08);
  --border-active: rgba(79,158,248,0.5);

  --text-primary: #1a2340;
  --text-secondary: #4a5568;
  --text-muted: #8fa3c0;

  --shadow-card: 0 4px 20px rgba(0,0,0,0.08);
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition-slow), color var(--transition-slow);
}
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
pre, code { font-family: 'JetBrains Mono', 'Fira Code', monospace; }

/* === LOADER === */
.loader {
  position: fixed; inset: 0;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.5s, visibility 0.5s;
}
.loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-inner { text-align: center; }
.loader-logo {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 32px;
  animation: pulse 1.5s ease-in-out infinite;
}
.loader-icon { font-size: 40px; color: var(--accent); }
.loader-text { font-size: 28px; font-weight: 800; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.loader-bar {
  width: 200px; height: 3px;
  background: rgba(255,255,255,0.1);
  border-radius: 99px; overflow: hidden;
}
.loader-progress {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 99px;
  animation: loader-fill 1.2s ease-out forwards;
}
@keyframes loader-fill { from { width: 0 } to { width: 100% } }
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: 0.6 } }

/* === TOPBAR === */
.topbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--topbar-height);
  background: rgba(10, 13, 20, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  display: flex; align-items: center; gap: 16px;
  padding: 0 24px;
  transition: background var(--transition-slow);
}
[data-theme="light"] .topbar { background: rgba(240,244,252,0.92); }

.menu-btn {
  display: flex; flex-direction: column; gap: 5px;
  padding: 8px; border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.menu-btn:hover { background: rgba(255,255,255,0.08); }
.menu-btn span {
  display: block; width: 22px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition);
}
.menu-btn.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn.active span:nth-child(2) { opacity: 0; }
.menu-btn.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.topbar-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 800;
  background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-right: auto;
}
.brand-icon { font-size: 22px; filter: none; -webkit-text-fill-color: initial; color: var(--accent); }

.topbar-nav {
  display: flex; gap: 4px;
}
.topbar-nav a {
  padding: 6px 14px;
  font-size: 13px; font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.topbar-nav a:hover { color: var(--text-primary); background: rgba(255,255,255,0.06); }

.theme-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  transition: background var(--transition), transform var(--transition);
}
.theme-btn:hover { background: rgba(255,255,255,0.12); transform: rotate(20deg); }

/* === SIDEBAR === */
.sidebar {
  position: fixed; left: -var(--sidebar-width); top: 0; bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  z-index: 200;
  display: flex; flex-direction: column;
  transform: translateX(calc(-1 * var(--sidebar-width)));
  transition: transform var(--transition-slow);
  overflow-y: auto;
}
.sidebar.open { transform: translateX(0); }

.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sidebar-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 800;
  background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.sidebar-close {
  width: 32px; height: 32px;
  border-radius: 50%;
  font-size: 14px;
  color: var(--text-muted);
  display: flex; align-items: center; justify-content: center;
  transition: color var(--transition), background var(--transition);
}
.sidebar-close:hover { color: var(--text-primary); background: rgba(255,255,255,0.1); }

.sidebar-search {
  padding: 16px 20px;
  position: relative;
  flex-shrink: 0;
}
.sidebar-search input {
  width: 100%;
  padding: 10px 36px 10px 14px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  transition: border-color var(--transition), background var(--transition);
  outline: none;
}
.sidebar-search input:focus { border-color: var(--accent); background: rgba(79,158,248,0.06); }
.search-icon {
  position: absolute; right: 32px; top: 50%; transform: translateY(-50%);
  color: var(--text-muted); font-size: 16px;
}

.sidebar-nav { padding: 8px 12px 24px; overflow-y: auto; flex: 1; }

.nav-group { margin-bottom: 20px; }
.nav-group-label {
  font-size: 10px; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-muted);
  padding: 8px 8px 4px;
  display: flex; align-items: center; gap: 6px;
}

.nav-item {
  display: block; padding: 8px 12px;
  font-size: 13px; font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  border-left: 2px solid transparent;
  margin-bottom: 2px;
}
.nav-item:hover { color: var(--text-primary); background: rgba(255,255,255,0.06); }
.nav-item.active { color: var(--accent); background: rgba(79,158,248,0.1); border-left-color: var(--accent); }

.nav-sub { padding-left: 24px; font-size: 12px; }

/* === SIDEBAR OVERLAY === */
.sidebar-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 199;
  opacity: 0; visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}
.sidebar-overlay.active { opacity: 1; visibility: visible; }

/* === MAIN CONTENT === */
.main-content { margin-top: var(--topbar-height); min-height: 100vh; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* === HERO === */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 0%, rgba(79,158,248,0.15) 0%, transparent 70%);
}

.hero-bg {
  position: absolute; inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.8) 0%, transparent 80%);
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: float 8s ease-in-out infinite;
}
.hero-orb-1 {
  width: 500px; height: 500px;
  background: rgba(79,158,248,0.12);
  top: -100px; left: -100px;
}
.hero-orb-2 {
  width: 400px; height: 400px;
  background: rgba(167,139,250,0.1);
  bottom: -50px; right: -50px;
  animation-delay: -3s;
}
.hero-orb-3 {
  width: 300px; height: 300px;
  background: rgba(45,212,191,0.08);
  top: 50%; right: 30%;
  animation-delay: -5s;
}
@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.hero-content {
  position: relative; z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: 60px 24px;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px;
  background: rgba(79,158,248,0.1);
  border: 1px solid rgba(79,158,248,0.3);
  border-radius: 99px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 24px;
  animation: badge-in 0.6s ease-out;
}
.badge-dot {
  width: 6px; height: 6px;
  background: var(--green);
  border-radius: 50%;
  animation: blink 2s ease-in-out infinite;
}
@keyframes blink { 0%,100% { opacity:1 } 50% { opacity:0.3 } }
@keyframes badge-in { from { opacity:0; transform:translateY(-10px) } to { opacity:1; transform:translateY(0) } }

.hero-title {
  font-size: clamp(40px, 7vw, 80px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  animation: title-in 0.8s ease-out 0.2s both;
}
.hero-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  display: block;
}
@keyframes title-in { from { opacity:0; transform:translateY(20px) } to { opacity:1; transform:translateY(0) } }

.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-secondary);
  max-width: 600px; margin: 0 auto 36px;
  line-height: 1.7;
  animation: title-in 0.8s ease-out 0.4s both;
}

.hero-search {
  display: flex; gap: 8px;
  max-width: 560px; margin: 0 auto 48px;
  animation: title-in 0.8s ease-out 0.6s both;
}
.hero-search input {
  flex: 1; padding: 14px 20px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 15px; font-family: inherit;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}
.hero-search input:focus { border-color: var(--accent); background: rgba(79,158,248,0.06); }
.hero-search input::placeholder { color: var(--text-muted); }
.hero-search-btn {
  padding: 14px 28px;
  background: var(--accent-gradient);
  color: white; font-size: 14px; font-weight: 600;
  border-radius: var(--radius);
  transition: opacity var(--transition), transform var(--transition);
  white-space: nowrap;
}
.hero-search-btn:hover { opacity: 0.9; transform: translateY(-1px); }

.hero-stats {
  display: flex; align-items: center; justify-content: center; gap: 32px;
  flex-wrap: wrap;
  animation: title-in 0.8s ease-out 0.8s both;
}
.stat { text-align: center; }
.stat-num {
  display: block; font-size: 32px; font-weight: 800;
  background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  line-height: 1;
}
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.stat-div { width: 1px; height: 40px; background: var(--border); }

/* === CATEGORIES === */
.categories-section { padding: 60px 0; }
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.category-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
  cursor: pointer;
  position: relative; overflow: hidden;
}
.category-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}
.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  border-color: var(--border-active);
  background: var(--bg-card-hover);
}
.category-card:hover::before { transform: scaleX(1); }

.cat-icon { font-size: 32px; margin-bottom: 16px; }
.category-card h3 {
  font-size: 17px; font-weight: 700;
  margin-bottom: 10px; color: var(--text-primary);
}
.category-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }
.cat-count {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(79,158,248,0.1);
  border: 1px solid rgba(79,158,248,0.2);
  border-radius: 99px;
  font-size: 11px; font-weight: 600;
  color: var(--accent);
}

/* === CONTENT SECTIONS === */
.content-section { padding: 80px 0; }
.alt-section { background: var(--bg-secondary); }

.section-header { text-align: center; margin-bottom: 56px; }
.section-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 99px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  background: rgba(79,158,248,0.1);
  border: 1px solid rgba(79,158,248,0.25);
  color: var(--accent);
  margin-bottom: 16px;
}
.ai-badge { background: rgba(167,139,250,0.1); border-color: rgba(167,139,250,0.25); color: var(--purple); }
.aws-badge { background: rgba(251,146,60,0.1); border-color: rgba(251,146,60,0.25); color: var(--orange); }
.scenarios-badge { background: rgba(52,211,153,0.1); border-color: rgba(52,211,153,0.25); color: var(--green); }
.code-badge { background: rgba(45,212,191,0.1); border-color: rgba(45,212,191,0.25); color: var(--teal); }
.trouble-badge { background: rgba(248,113,113,0.1); border-color: rgba(248,113,113,0.25); color: var(--red); }

.section-header h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800; letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.section-header p { font-size: 17px; color: var(--text-secondary); max-width: 640px; margin: 0 auto; }

/* === ARCH CARDS === */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.arch-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex; flex-direction: column; gap: 16px;
}
.arch-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: var(--border-active);
}

.arch-card-header {
  display: flex; align-items: center; gap: 14px;
}
.arch-logo {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800; letter-spacing: -0.05em;
  flex-shrink: 0;
}
.netflix-logo { background: linear-gradient(135deg, #e50914, #b20710); color: white; }
.hotstar-logo { background: linear-gradient(135deg, #1f80e0, #0056b3); color: white; }
.amazon-logo { background: linear-gradient(135deg, #ff9900, #e68a00); color: white; }
.uber-logo { background: linear-gradient(135deg, #000, #333); color: white; }
.whatsapp-logo { background: linear-gradient(135deg, #25d366, #1db954); color: white; }
.youtube-logo { background: linear-gradient(135deg, #ff0000, #cc0000); color: white; }
.nse-logo { background: linear-gradient(135deg, #005baa, #003d75); color: white; font-size: 11px; }

.arch-card h3 { font-size: 18px; font-weight: 700; margin: 0; }
.arch-scale { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.arch-tag {
  margin-left: auto; flex-shrink: 0;
  padding: 3px 10px;
  background: rgba(167,139,250,0.1);
  border: 1px solid rgba(167,139,250,0.2);
  border-radius: 99px;
  font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--purple);
}

.arch-card > p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

.arch-highlights { display: flex; flex-wrap: wrap; gap: 6px; }
.highlight {
  padding: 4px 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 11px; font-weight: 500;
  color: var(--text-secondary);
}

.arch-metrics {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
  padding: 16px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.metric { text-align: center; }
.metric-val {
  display: block; font-size: 18px; font-weight: 800;
  background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.metric-label { font-size: 10px; color: var(--text-muted); margin-top: 2px; }

.arch-diagram { overflow-x: auto; }
.diagram-code {
  font-size: 11px; line-height: 1.6;
  color: var(--accent);
  background: rgba(79,158,248,0.05);
  border: 1px solid rgba(79,158,248,0.15);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  white-space: pre;
}

.read-more-btn {
  margin-top: auto;
  padding: 10px 18px;
  background: rgba(79,158,248,0.1);
  border: 1px solid rgba(79,158,248,0.2);
  border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 600;
  color: var(--accent);
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  text-align: center;
}
.read-more-btn:hover { background: rgba(79,158,248,0.2); border-color: var(--accent); transform: translateX(2px); }

/* === AI GRID === */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative; overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.ai-card::after {
  content: ''; position: absolute; top: 0; right: 0;
  width: 80px; height: 80px;
  border-radius: 50%;
  opacity: 0.15;
  transition: transform var(--transition-slow);
}
.ai-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); }
.ai-card:hover::after { transform: scale(2); }

.beginner::after { background: var(--green); }
.beginner-mid::after { background: var(--teal); }
.intermediate::after { background: var(--accent); }
.intermediate-adv::after { background: var(--purple); }
.advanced::after { background: var(--red); }

.ai-level {
  display: inline-block; margin-bottom: 12px;
  padding: 3px 10px; border-radius: 99px;
  font-size: 10px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
}
.beginner .ai-level { background: rgba(52,211,153,0.15); color: var(--green); }
.beginner-mid .ai-level { background: rgba(45,212,191,0.15); color: var(--teal); }
.intermediate .ai-level { background: rgba(79,158,248,0.15); color: var(--accent); }
.intermediate-adv .ai-level { background: rgba(167,139,250,0.15); color: var(--purple); }
.advanced .ai-level { background: rgba(248,113,113,0.15); color: var(--red); }

.ai-icon { font-size: 28px; margin-bottom: 10px; }
.ai-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.ai-card > p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 14px; }

.ai-concepts { display: flex; flex-wrap: wrap; gap: 6px; }
.ai-concepts span {
  padding: 3px 9px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 11px; color: var(--text-muted);
}

/* === QUICK REF (Terms) === */
.quick-ref {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.quick-ref h3 { font-size: 20px; font-weight: 700; margin-bottom: 24px; }
.term-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}
.term-item {
  padding: 14px 16px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: grid; gap: 4px;
}
.term-item strong { font-size: 13px; color: var(--accent); }
.term-item span { font-size: 12px; color: var(--text-secondary); line-height: 1.5; }

/* === PILLARS GRID === */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
}
.pillar-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); }

.pillar-num {
  font-size: 48px; font-weight: 900; line-height: 1;
  color: rgba(255,255,255,0.04);
  position: absolute; top: 12px; right: 16px;
  font-family: 'JetBrains Mono', monospace;
}
.pillar-icon { font-size: 28px; margin-bottom: 12px; }
.pillar-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.pillar-card > p { font-size: 13px; color: var(--text-secondary); margin-bottom: 14px; line-height: 1.6; }
.pillar-services { font-size: 11px; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 12px; line-height: 1.6; }

.security-pillar { border-color: rgba(248,113,113,0.2); }
.reliability-pillar { border-color: rgba(52,211,153,0.2); }
.perf-pillar { border-color: rgba(79,158,248,0.2); }
.cost-pillar { border-color: rgba(251,191,36,0.2); }
.sustain-pillar { border-color: rgba(45,212,191,0.2); }

/* === DECISION TABLE === */
.decision-table-wrap, .cost-table-wrap { margin-bottom: 40px; }
.decision-table-wrap h3, .cost-table-wrap h3 {
  font-size: 20px; font-weight: 700; margin-bottom: 20px;
}
.table-scroll { overflow-x: auto; border-radius: var(--radius); }

.decision-table {
  width: 100%; border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.decision-table th {
  padding: 14px 16px; text-align: left;
  font-size: 12px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--text-muted);
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}
.decision-table td {
  padding: 12px 16px; font-size: 13px; color: var(--text-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.decision-table tr:hover td { background: rgba(79,158,248,0.04); }
.service-tag {
  font-weight: 700; font-size: 12px;
  color: var(--accent); font-family: 'JetBrains Mono', monospace;
}

/* === COST GRID === */
.cost-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.cost-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: grid; gap: 6px;
}
.cost-area {
  font-size: 10px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-muted);
}
.cost-action { font-size: 13px; color: var(--text-primary); }
.cost-save { font-size: 12px; font-weight: 700; }
.save-high { color: var(--green); }
.save-med { color: var(--yellow); }
.save-low { color: var(--accent); }

/* === SCENARIOS === */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}
.scenario-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--border-active);
}
.scenario-num {
  font-size: 60px; font-weight: 900; line-height: 1;
  color: rgba(255,255,255,0.04);
  position: absolute; top: 8px; right: 16px;
  font-family: 'JetBrains Mono', monospace;
}
.scenario-industry {
  font-size: 10px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--green); margin-bottom: 8px;
}
.scenario-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.scenario-card > p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 14px; }
.scenario-stack { display: flex; flex-wrap: wrap; gap: 6px; }
.scenario-stack span {
  padding: 4px 10px;
  background: rgba(52,211,153,0.08);
  border: 1px solid rgba(52,211,153,0.2);
  border-radius: var(--radius-sm);
  font-size: 11px; font-weight: 600;
  color: var(--green);
  font-family: 'JetBrains Mono', monospace;
}

.scenario-structure {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.scenario-structure h3 { font-size: 20px; font-weight: 700; margin-bottom: 24px; }
.structure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}
.structure-item {
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px; color: var(--text-secondary);
}

/* === READING APPROACH === */
.reading-approach {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 40px;
}
.reading-approach h3 { font-size: 18px; font-weight: 700; margin-bottom: 20px; }
.steps-row {
  display: flex; align-items: flex-start;
  gap: 12px; flex-wrap: wrap;
}
.step-item {
  flex: 1; min-width: 100px;
  display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: 6px;
}
.step-num {
  width: 32px; height: 32px;
  background: var(--accent-gradient);
  border-radius: 50%;
  font-size: 13px; font-weight: 800; color: white;
  display: flex; align-items: center; justify-content: center;
}
.step-item strong { font-size: 12px; color: var(--text-primary); }
.step-item span { font-size: 11px; color: var(--text-muted); }
.step-arrow { color: var(--text-muted); font-size: 18px; padding-top: 6px; flex-shrink: 0; }

/* === LANG GRID === */
.lang-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.lang-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.lang-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); }

.lang-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  font-size: 13px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 14px;
}
.java-icon { background: linear-gradient(135deg, #f89820, #e07000); color: white; }
.python-icon { background: linear-gradient(135deg, #3776ab, #ffd43b); color: white; }
.js-icon { background: linear-gradient(135deg, #f7df1e, #e6c91e); color: #1a1a1a; }
.ts-icon { background: linear-gradient(135deg, #3178c6, #1f5fa6); color: white; }
.go-icon { background: linear-gradient(135deg, #00add8, #0080a0); color: white; }
.sql-icon { background: linear-gradient(135deg, #336791, #1d4060); color: white; }
.tf-icon { background: linear-gradient(135deg, #7b42bc, #5b2d8a); color: white; }
.shell-icon { background: linear-gradient(135deg, #4a4a4a, #2a2a2a); color: #84cc16; }
.yaml-icon { background: linear-gradient(135deg, #cb3837, #992c2b); color: white; }
.spring-icon { background: linear-gradient(135deg, #6db33f, #4d8c2e); color: white; }

.lang-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.lang-files { font-size: 11px; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; margin-bottom: 8px; line-height: 1.6; }
.lang-topics { font-size: 12px; color: var(--text-secondary); line-height: 1.6; }

/* === MINDSET BOX === */
.mindset-box {
  background: linear-gradient(135deg, rgba(79,158,248,0.08), rgba(167,139,250,0.08));
  border: 1px solid rgba(79,158,248,0.2);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 40px;
}
.mindset-box h3 { font-size: 18px; font-weight: 700; margin-bottom: 20px; }
.mindset-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px; margin-bottom: 20px;
}
.mindset-item {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px;
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius);
  font-size: 13px;
}
.mindset-num {
  width: 24px; height: 24px;
  background: var(--accent-gradient);
  border-radius: 50%; flex-shrink: 0;
  font-size: 11px; font-weight: 800; color: white;
  display: flex; align-items: center; justify-content: center;
  margin-top: 1px;
}
.mindset-item strong { color: var(--text-primary); display: block; margin-bottom: 2px; }
.mindset-tip {
  padding: 12px 16px;
  background: rgba(251,191,36,0.08);
  border: 1px solid rgba(251,191,36,0.2);
  border-radius: var(--radius);
  font-size: 13px; color: var(--yellow);
}

/* === TROUBLE TABLE === */
.quick-trouble-table { margin-bottom: 40px; }
.quick-trouble-table h3 { font-size: 20px; font-weight: 700; margin-bottom: 20px; }
.trouble-table {
  width: 100%; border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.trouble-table th {
  padding: 12px 16px; text-align: left;
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-muted); background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}
.trouble-table td {
  padding: 11px 16px; font-size: 13px; color: var(--text-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: middle;
}
.trouble-table tr:hover td { background: rgba(248,113,113,0.04); }
.trouble-table code {
  font-size: 11px; padding: 2px 8px;
  background: rgba(248,113,113,0.1);
  border: 1px solid rgba(248,113,113,0.2);
  border-radius: 4px;
  color: var(--red);
}

/* === TROUBLE GRID === */
.trouble-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.trouble-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.trouble-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: rgba(248,113,113,0.3);
}
.trouble-icon { font-size: 28px; margin-bottom: 12px; }
.trouble-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.trouble-card > p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* === FOOTER === */
.footer {
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .footer-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 20px; font-weight: 800;
  background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}
.footer-brand p { font-size: 14px; color: var(--text-muted); line-height: 1.7; max-width: 280px; }

.footer-links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.footer-col h4 { font-size: 12px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 16px; }
.footer-col a {
  display: block; font-size: 13px; color: var(--text-secondary);
  margin-bottom: 10px;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 0;
  border-top: 1px solid var(--border);
  font-size: 12px; color: var(--text-muted);
}

/* === SCROLL TOP === */
.scroll-top {
  position: fixed; bottom: 28px; right: 28px;
  width: 44px; height: 44px;
  background: var(--accent-gradient);
  border-radius: 50%;
  color: white; font-size: 18px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 14px rgba(79,158,248,0.4);
  opacity: 0; visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 50;
}
.scroll-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.scroll-top:hover { transform: translateY(-3px); }

/* === DETAIL MODAL === */
.detail-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 300;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  opacity: 0; visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}
.detail-overlay.open { opacity: 1; visibility: visible; }

.detail-modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 800px; width: 100%;
  max-height: 80vh; overflow-y: auto;
  padding: 32px;
  position: relative;
  transform: scale(0.95);
  transition: transform var(--transition-slow);
}
.detail-overlay.open .detail-modal { transform: scale(1); }

.detail-close {
  position: absolute; top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  color: var(--text-muted);
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), color var(--transition);
}
.detail-close:hover { background: rgba(255,255,255,0.12); color: var(--text-primary); }

/* === SEARCH HIGHLIGHT === */
.search-highlight { background: rgba(79,158,248,0.25); border-radius: 2px; }
.search-result-found { border-color: var(--accent) !important; }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .topbar-nav { display: none; }
  .hero-stats { gap: 16px; }
  .stat-div { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: repeat(2, 1fr); }
  .steps-row { flex-direction: column; align-items: stretch; }
  .step-arrow { display: none; }
  .step-item { flex-direction: row; align-items: flex-start; text-align: left; }
  .hero-search { flex-direction: column; }
  .mindset-steps { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .cards-grid, .scenarios-grid, .ai-grid { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 36px; }
}

/* === ANIMATIONS === */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  animation: fade-up 0.6s ease-out forwards;
}

/* Stagger children */
.arch-card:nth-child(1) { animation-delay: 0.05s; }
.arch-card:nth-child(2) { animation-delay: 0.1s; }
.arch-card:nth-child(3) { animation-delay: 0.15s; }
.arch-card:nth-child(4) { animation-delay: 0.2s; }
.arch-card:nth-child(5) { animation-delay: 0.25s; }
.arch-card:nth-child(6) { animation-delay: 0.3s; }
.arch-card:nth-child(7) { animation-delay: 0.35s; }

/* === PREMIUM MARKDOWN RENDER STYLES === */
.detail-content h1 {
  font-size: 28px; font-weight: 800; margin-bottom: 24px;
  background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  line-height: 1.2; border-bottom: 1px solid var(--border); padding-bottom: 12px;
}
.detail-content h2 {
  font-size: 20px; font-weight: 700; margin: 32px 0 16px;
  color: var(--text-primary); border-left: 3px solid var(--accent); padding-left: 12px;
}
.detail-content h3 {
  font-size: 16px; font-weight: 700; margin: 24px 0 12px;
  color: var(--text-primary);
}
.detail-content h4 {
  font-size: 14px; font-weight: 700; margin: 16px 0 8px;
  color: var(--text-primary);
}
.detail-content p {
  font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px;
}
.detail-content ul, .detail-content ol {
  margin-bottom: 20px; padding-left: 20px;
}
.detail-content li {
  font-size: 13.5px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 6px;
}
.detail-content blockquote {
  border-left: 4px solid var(--border-active);
  background: rgba(255,255,255,0.02);
  padding: 16px 20px; border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0; font-style: italic; color: var(--text-secondary);
}

/* Custom Alerts in Modal */
.custom-alert {
  padding: 18px 20px; border-radius: var(--radius);
  margin: 24px 0; border-left: 4px solid transparent;
}
.note-alert { background: rgba(79,158,248,0.06); border-left-color: var(--accent); }
.tip-alert { background: rgba(52,211,153,0.06); border-left-color: var(--green); }
.warning-alert { background: rgba(251,191,36,0.06); border-left-color: var(--yellow); }
.important-alert { background: rgba(248,113,113,0.06); border-left-color: var(--red); }
.caution-alert { background: rgba(251,146,60,0.06); border-left-color: var(--orange); }

.alert-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; font-weight: 800; font-size: 12px; letter-spacing: 0.05em; }
.note-alert .alert-title { color: var(--accent); }
.tip-alert .alert-title { color: var(--green); }
.warning-alert .alert-title { color: var(--yellow); }
.important-alert .alert-title { color: var(--red); }
.caution-alert .alert-title { color: var(--orange); }
.alert-content p { margin-bottom: 0; }

/* Custom Code blocks in Modal */
.code-container {
  background: #080a0f; border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; margin: 24px 0;
}
.code-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}
.code-lang { font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 700; color: var(--text-muted); }
.copy-code-btn {
  font-size: 11px; font-weight: 600; color: var(--accent);
  padding: 3px 8px; border-radius: 4px; border: 1px solid rgba(79,158,248,0.2);
  transition: all var(--transition);
  background: none;
}
.copy-code-btn:hover { background: rgba(79,158,248,0.1); border-color: var(--accent); }
.code-container pre { padding: 16px 20px; overflow-x: auto; margin: 0; }
.code-container code { font-size: 12.5px; line-height: 1.6; color: #a6adbb; font-family: 'JetBrains Mono', monospace; }

/* ASCII Blueprint styles */
.ascii-diagram {
  border-color: rgba(79,158,248,0.25);
  box-shadow: 0 0 20px rgba(79,158,248,0.06);
}
.ascii-diagram .code-header { background: rgba(79,158,248,0.08); }
.ascii-diagram code { color: #5eb3f8; }

/* Syntax Highlighting Colors */
.code-keyword { color: #f472b6; font-weight: 600; }
.code-string { color: #34d399; }
.code-comment { color: #6b7280; font-style: italic; }
.code-number { color: #fbbf24; }

/* Inline codes in Modal */
.detail-content code:not(pre code) {
  font-size: 12px; padding: 2px 6px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 4px; color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}

/* Custom interactive links inside markdown */
.md-link {
  color: var(--accent); font-weight: 600; border-bottom: 1px dashed rgba(79,158,248,0.4);
  transition: border-color var(--transition);
}
.md-link:hover { border-bottom-style: solid; border-bottom-color: var(--accent); }

/* Modal specific loading spinner */
.modal-spinner-wrap {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 80px 24px; gap: 16px; text-align: center;
}
.modal-spinner {
  width: 48px; height: 48px; border: 3px solid rgba(79,158,248,0.1);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.modal-spinner-wrap p { color: var(--text-secondary); font-size: 14px; font-weight: 500; }

.modal-error-wrap {
  text-align: center; padding: 60px 24px;
}
.error-icon { font-size: 48px; margin-bottom: 16px; }
.modal-error-wrap h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: var(--red); }
.modal-error-wrap p { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }