/* ============================================
   SOA & Microservices Textbook — Design System v2.0
   Aesthetic: Ethereal Glass / Dark Tech / Editorial
   Skills applied: frontend-design + high-end-visual-design + design-taste-frontend
   DESIGN_VARIANCE: 7 | MOTION_INTENSITY: 5 | VISUAL_DENSITY: 5
   ============================================ */

/* ── Typography — Geist + JetBrains Mono (local fonts) ── */
/* Google Fonts removed per design system rules */

/* ── CSS Custom Properties — Dark-First (Ethereal Glass) ── */
:root {
  /* Primary — Vivid Orange (brand identity) */
  --primary:          #ff7a00;
  --primary-hover:    #ff9133;
  --primary-dim:      rgba(255, 122, 0, 0.10);
  --primary-dim-hover:rgba(255, 122, 0, 0.18);
  --primary-glow:     rgba(255, 122, 0, 0.35);
  --primary-gradient: linear-gradient(135deg, #ff8c00 0%, #ff5500 100%);
  /* Màu chữ đặt TRÊN nền --primary. Dark theme dùng cam sáng nên chữ đen
     đạt 8,04:1; light theme dùng cam tối nên phải là chữ trắng (5,40:1). */
  --on-primary:       #000000;

  /* Semantic — refined tones */
  --success:      #22d3a0;
  --success-dim:  rgba(34, 211, 160, 0.10);
  --success-glow: rgba(34, 211, 160, 0.35);
  --warning:      #f59e0b;
  --warning-dim:  rgba(245, 158, 11, 0.10);
  --danger:       #f43f5e;
  --danger-dim:   rgba(244, 63, 94, 0.10);
  --info:         #60a5fa;
  --info-dim:     rgba(96, 165, 250, 0.10);

  /* Dark (default) — OLED Black Ethereal */
  --bg:              #050505;
  --bg-surface:      #0a0a0a;
  --bg-card:         #0f0f0f;
  --bg-card-hover:   #141414;
  --bg-elevated:     #1a1a1a;
  --bg-overlay:      rgba(5, 5, 5, 0.85);

  /* Borders — hairline glass */
  --border:         rgba(255, 255, 255, 0.055);
  --border-hover:   rgba(255, 255, 255, 0.11);
  --border-active:  rgba(255, 122, 0, 0.40);
  --border-inner:   rgba(255, 255, 255, 0.07);

  /* Text */
  --text-main:      #ededed;
  --text-secondary: #888;
  /* #444 cũ chỉ đạt 1,79:1 trên --bg-elevated #1a1a1a — dưới xa ngưỡng AA 4,5:1,
     và nó là nguyên nhân đơn lẻ lớn nhất của lỗi tương phản ở dark theme
     (act-num, th, book-identity, log-time... trên 29 trang). #828282 đạt
     4,53:1 trên nền sáng nhất của nhóm tối và 5,30:1 trên nền chính #050505. */
  --text-dim:       #828282;
  --text-accent:    var(--primary);

  /* Shadows — tinted, not harsh black */
  --shadow-soft:         0 1px 3px rgba(0,0,0,0.6), 0 1px 2px rgba(0,0,0,0.4);
  --shadow-medium:       0 4px 24px rgba(0,0,0,0.7), 0 2px 8px rgba(0,0,0,0.5);
  --shadow-glow:         0 0 0 1px rgba(255,122,0,0.2), 0 0 24px rgba(255,122,0,0.12);
  --shadow-glow-strong:  0 0 0 1px rgba(255,122,0,0.3), 0 0 48px rgba(255,122,0,0.18);
  --shadow-card:         0 2px 8px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.04);
  --shadow-card-hover:   0 4px 24px rgba(0,0,0,0.7), inset 0 1px 0 rgba(255,255,255,0.07);

  /* Geometry — consistent scale */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl:32px;

  /* Font */
  --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-body: var(--font-sans);

  /* Spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Grid */
  --grid-color: rgba(255, 255, 255, 0.022);
  --grid-size:  44px;

  /* Motion — cubic-bezier spring */
  --ease-spring:  cubic-bezier(0.32, 0.72, 0, 1);
  --ease-out:     cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:  cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast:   150ms;
  --duration-base:   250ms;
  --duration-slow:   450ms;
  --duration-enter:  650ms;
}

/* ── Light Mode Override ── */
.light {
  --bg:              #fafafa;
  --bg-surface:      #f2f2f5;
  --bg-card:         #ffffff;
  --bg-card-hover:   #f7f7fb;
  --bg-elevated:     #ebebef;
  --bg-overlay:      rgba(250, 250, 250, 0.92);
  --border:         rgba(0, 0, 0, 0.07);
  --border-hover:   rgba(0, 0, 0, 0.14);
  --border-inner:   rgba(0, 0, 0, 0.05);
  --text-main:      #0d0d0d;
  --text-secondary: #555;
  --text-dim:       #666666;

  /* Màu nhấn dẫn lại riêng cho light theme.
     Light theme trước đây chỉ đảo nền mà giữ nguyên màu nhấn của dark theme,
     nên chúng rơi xuống 2,3--2,6:1 trên nền sáng — dưới xa ngưỡng AA 4,5:1.
     Đo trên nền thật (#fafafa, #ffffff, #f2f2f5, #ebebef) với transition đã tắt.
     Giữ nguyên hue, chỉ hạ độ sáng tới mức đạt >= 4,5:1 trên cả nền tối nhất.

     --on-primary là màu chữ đặt TRÊN nền --primary: dark dùng cam sáng nên chữ
     đen đạt 8,04:1; light dùng cam tối nên phải là chữ trắng (5,40:1). Một token
     màu không thể phục vụ cả hai vai trò — chữ đen trên nó cần luminance >= 0,175
     còn nó làm chữ trên nền sáng cần <= 0,148.
     Dark theme không đổi. Xem PRC-2026-09 ghế G6. */
  --primary:        #aa5100;
  --primary-hover:  #8f4400;
  --primary-gradient: linear-gradient(135deg, #b35400 0%, #8a3a00 100%);
  --on-primary:     #ffffff;
  --success:        #14795c;
  --warning:        #945f06;
  --danger:         #d50c2f;
  --grid-color:     rgba(0, 0, 0, 0.025);
  --shadow-card:    0 1px 4px rgba(0,0,0,0.08), inset 0 1px 0 rgba(255,255,255,0.8);
  --shadow-card-hover: 0 4px 20px rgba(0,0,0,0.12), inset 0 1px 0 rgba(255,255,255,0.9);
  --shadow-glow:    0 0 0 1px rgba(255,122,0,0.2), 0 0 20px rgba(255,122,0,0.08);
}

/* ── Base Reset & Body ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  background: var(--bg);
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  transition: background var(--duration-slow) var(--ease-out), color var(--duration-slow) var(--ease-out);
  position: relative;
}

/* Grain overlay — fixed, pointer-events-none, performance-safe */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9000;
  mix-blend-mode: overlay;
  opacity: 0.6;
}

/* Vignette — subtle radial depth */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, transparent 40%, rgba(0,0,0,0.5) 100%);
  pointer-events: none;
  z-index: 1;
}

.light body::after {
  background: radial-gradient(ellipse at 50% 0%, transparent 60%, rgba(0,0,0,0.06) 100%);
}

::selection { background: rgba(255, 122, 0, 0.28); color: inherit; }

/* ── Typography scale ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--text-main);
}

h1 { font-size: clamp(1.5rem, 3vw, 2.25rem); letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.01em; }
h3 { font-size: 1rem; font-weight: 600; }
h4 { font-size: 1rem; letter-spacing: -0.02em; }

code, pre, .mono {
  font-family: var(--font-mono);
  font-feature-settings: 'calt' 1, 'liga' 1;
}

/* ── Glassmorphic Navbar (floating, not edge-to-edge) ── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(8, 8, 8, 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--duration-base) var(--ease-out);
}

.light .navbar {
  background: rgba(250, 250, 250, 0.82);
  border-bottom-color: var(--border);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.02em;
}
.navbar-brand .label { color: var(--primary); }

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  overflow-x: auto;
}

.navbar-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast), background var(--duration-fast);
  white-space: nowrap;
}

.navbar-links a:hover { color: var(--text-main); background: var(--border); }
.navbar-links a.active { color: var(--primary); background: var(--primary-dim); }

.navbar-actions { display: flex; align-items: center; gap: 8px; }

/* ── Theme Toggle ── */
.theme-toggle {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: all var(--duration-base) var(--ease-out);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  transform: scale(1.05);
  box-shadow: var(--shadow-soft);
}

/* ── Page Layout ── */
.page-container {
  max-width: 1020px;
  margin: 0 auto;
  padding: 36px 24px 72px;
  position: relative;
  z-index: 2;
}

/* ── Page Header — Left-border editorial style ── */
.page-header {
  margin-bottom: 44px;
  padding-top: 8px;
  padding-left: 20px;
  border-left: 2px solid var(--primary);
  animation: slideUpFade var(--duration-enter) var(--ease-out) both;
}

.page-header h1 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.045em;
  margin-bottom: 8px;
}

.page-header .subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.65;
}

/* ── Chapter Badge — eyebrow pill ── */
.chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-dim);
  color: var(--primary);
  font-size: 10px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  border: 1px solid rgba(255, 122, 0, 0.20);
  font-family: var(--font-mono);
}

/* ── Cards — Double-Bezel Architecture ── */

/* Outer Shell */
.card-shell {
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2px;
  box-shadow: var(--shadow-card);
  transition:
    box-shadow var(--duration-base) var(--ease-spring),
    border-color var(--duration-base) var(--ease-spring);
}

.card-shell:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
}

/* Inner Core */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-inner);
  border-radius: calc(var(--radius-xl) - 2px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
  padding: 24px;
  transition:
    background var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-spring);
}

/* Standalone card (without shell) */
.card.standalone {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.card.standalone:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
}

.card.card-glow:hover {
  box-shadow: var(--shadow-glow);
  border-color: rgba(255, 122, 0, 0.18);
}

.card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.01em;
}

.card-title::before {
  content: '';
  display: block;
  width: 3px;
  height: 14px;
  background: var(--primary);
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── Grid System ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 3fr 2fr 2fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* Metric strip */
.metric-strip {
  display: flex;
  gap: 1px;
  overflow-x: auto;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.metric-strip .metric { flex: 1; min-width: 100px; background: var(--bg-card); border-radius: 0; }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .page-header h1 { font-size: 1.35rem; }
  .page-container { padding: 24px 16px 60px; }
  .btn { min-height: 44px; }
}

/* ── Buttons — Island / Pill Architecture ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-sans);
  letter-spacing: -0.01em;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  color: var(--text-main);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-fast) var(--ease-out);
  outline: none;
  user-select: none;
  white-space: nowrap;
}

.btn:hover { background: var(--bg-card-hover); border-color: var(--border-hover); }
.btn:active { transform: scale(0.97) translateY(1px); }

/* Button-in-Button trailing icon */
.btn .btn-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255,255,255,0.07);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  transition: transform var(--duration-fast) var(--ease-spring);
}
.btn:hover .btn-icon { transform: translateX(2px) translateY(-1px) scale(1.1); }

.btn-primary {
  background: var(--primary-gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 1px 8px rgba(255,122,0,0.25);
}
.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  filter: brightness(1.08);
}

.btn-danger  { background: var(--danger);  color: #fff; border-color: transparent; }
.btn-danger:hover  { filter: brightness(1.12); }
.btn-success { background: var(--success); color: #050505; border-color: transparent; }
.btn-info    { background: var(--info);    color: #fff; border-color: transparent; }

.btn-ghost { background: transparent; border-color: var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-dim); }

.btn-sm { padding: 5px 12px; font-size: 12px; border-radius: var(--radius-sm); }

.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  font-size: 10px;
  font-weight: 700;
  border-radius: 999px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.badge-success { background: var(--success-dim); color: var(--success); border: 1px solid rgba(34,211,160,0.2); }
.badge-warning { background: var(--warning-dim); color: var(--warning); border: 1px solid rgba(245,158,11,0.2); }
.badge-danger  { background: var(--danger-dim);  color: var(--danger);  border: 1px solid rgba(244,63,94,0.2); }
.badge-info    { background: var(--info-dim);    color: var(--info);    border: 1px solid rgba(96,165,250,0.2); }
.badge-primary { background: var(--primary-dim); color: var(--primary); border: 1px solid rgba(255,122,0,0.2); }

/* ── Code Block — Premium Terminal ── */
.code-block {
  background: #070d14;
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-medium);
}

.code-block-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.traffic-lights { display: flex; gap: 6px; }
.traffic-light { width: 11px; height: 11px; border-radius: 50%; }
.traffic-light.red    { background: #ff5f56; }
.traffic-light.yellow { background: #ffbd2e; }
.traffic-light.green  { background: #27c93f; }

.code-block-title {
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.code-block pre {
  padding: 18px;
  margin: 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  color: #cdd6f4;
}

.code-block .keyword { color: #cba6f7; }
.code-block .string  { color: #a6e3a1; }
.code-block .comment { color: #585b70; }
.code-block .type    { color: #89b4fa; }
.code-block .number  { color: #fab387; }
.code-block .func    { color: #89dceb; }
.code-block .annotation { color: #f38ba8; }

/* ── Metrics ── */
.metric { text-align: left; padding: 18px 16px; }
.metric-value {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 5px;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  letter-spacing: -0.04em;
}
.metric-label {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  font-family: var(--font-mono);
}

/* ── Flow Pipeline ── */
.flow-container {
  display: flex;
  align-items: center;
  overflow-x: auto;
  padding: 24px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.flow-node {
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  text-align: center;
  min-width: 120px;
  box-shadow: var(--shadow-card);
  transition: all var(--duration-base) var(--ease-spring);
}

.flow-node.active  { border-color: var(--primary); box-shadow: var(--shadow-glow), var(--shadow-card); }
.flow-node.success { border-color: var(--success); box-shadow: 0 0 0 1px rgba(34,211,160,0.2), 0 0 16px rgba(34,211,160,0.1); }
.flow-node.error   { border-color: var(--danger);  box-shadow: 0 0 0 1px rgba(244,63,94,0.2), 0 0 16px rgba(244,63,94,0.1); }

.flow-node .node-title { font-size: 12px; font-weight: 700; margin-bottom: 3px; letter-spacing: -0.01em; }
.flow-node .node-desc  { font-size: 10px; color: var(--text-dim); font-family: var(--font-mono); }

.flow-arrow       { flex-shrink: 0; color: var(--text-dim); padding: 0 10px; font-size: 16px; }
.flow-arrow.active { color: var(--primary); }

/* ── Service Box — for microservice diagrams ── */
.service-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  min-width: 110px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: all var(--duration-base) var(--ease-spring);
  position: relative;
  overflow: hidden;
}

.service-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.025) 0%, transparent 50%);
  pointer-events: none;
}

.service-box.active {
  border-color: var(--success);
  box-shadow: 0 0 0 1px rgba(34,211,160,0.2), 0 0 20px rgba(34,211,160,0.1), var(--shadow-card);
}

.service-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.07em;
  margin-bottom: 6px;
  opacity: 0.9;
}

.service-name {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0;
}

.service-db {
  margin-top: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-dim);
}

/* ── State Circles ── */
.state-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  border: 2px solid var(--border);
  margin: 0 auto 12px;
  transition: all var(--duration-slow) var(--ease-spring);
  box-shadow: var(--shadow-card);
}

.state-circle.closed    { border-color: var(--success); color: var(--success); background: var(--success-dim); }
.state-circle.open      { border-color: var(--danger);  color: var(--danger);  background: var(--danger-dim); }
.state-circle.half-open { border-color: var(--warning); color: var(--warning); background: var(--warning-dim); }

/* ── Log Panel ── */
.log-panel {
  background: #060c12;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #cdd6f4;
  max-height: 200px;
  overflow-y: auto;
  line-height: 1.85;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}

.log-panel .log-time    { color: #45475a; }
.log-panel .log-success { color: var(--success); }
.log-panel .log-error   { color: var(--danger); }
.log-panel .log-warn    { color: var(--warning); }
.log-panel .log-info    { color: var(--info); }

/* ── Progress Bar ── */
.progress-bar {
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 2px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 2px;
  transition: width 0.6s var(--ease-out);
  box-shadow: 0 0 8px rgba(255,122,0,0.3);
}

/* ── Callout ── */
.callout {
  border-left: 2px solid var(--primary);
  background: var(--primary-dim);
  padding: 14px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.7;
  position: relative;
}

.callout::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary), rgba(255,122,0,0.2));
  border-radius: 2px;
}

.callout strong {
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 5px;
  opacity: 0.8;
}

/* ── Tables ── */
.table-wrapper { overflow-x: auto; }

table { width: 100%; border-collapse: collapse; font-size: 13px; }

th, td { padding: 10px 16px; text-align: left; border-bottom: 1px solid var(--border); }

th {
  font-weight: 600;
  color: var(--text-dim);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}

tbody tr:hover { background: rgba(255,255,255,0.018); }
.light tbody tr:hover { background: rgba(0,0,0,0.025); }

.tick { color: var(--success); font-weight: 700; }
.cross { color: var(--danger); font-weight: 700; }

/* ── Section Headings ── */
.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.025em;
}
.section-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.65;
}

/* ── Divider ── */
.divider { height: 1px; background: var(--border); margin: 28px 0; }

/* ── Controls ── */
.controls { display: flex; gap: 10px; justify-content: center; margin: 24px 0; flex-wrap: wrap; }

/* ── Connector (for architecture diagrams) ── */
.connector-v {
  width: 1px;
  margin: 0 auto;
  background: linear-gradient(180deg, var(--primary), rgba(255,122,0,0.1));
  opacity: 0.6;
}

.connector-h {
  height: 1px;
  background: linear-gradient(90deg, rgba(255,122,0,0.1), var(--primary), rgba(255,122,0,0.1));
  opacity: 0.5;
  flex: 1;
}

/* ── Monolith Block ── */
.monolith-block {
  background: var(--bg-elevated);
  border: 1px dashed var(--border-hover);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.module-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  border-radius: 999px;
  margin: 3px;
  font-size: 11px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: all var(--duration-base) var(--ease-spring);
  font-family: var(--font-mono);
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.module-pill.highlight {
  border-color: var(--primary);
  background: var(--primary-dim);
  color: var(--primary);
  box-shadow: 0 0 8px rgba(255,122,0,0.15);
}

/* ── DB Block ── */
.db-block {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  text-align: center;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  letter-spacing: 0.03em;
}

/* ── Deploy Animation Bar ── */
.deploy-track {
  height: 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
  margin: 8px 0;
}

.deploy-bar {
  height: 100%;
  border-radius: var(--radius-sm);
  transition: width 0.9s var(--ease-out);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 10px;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  min-width: 36px;
}

/* ── Pattern Card (hub page) ── */
.pattern-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  text-decoration: none;
  color: var(--text-main);
  display: block;
  transition:
    border-color var(--duration-base) var(--ease-spring),
    box-shadow var(--duration-base) var(--ease-spring),
    transform var(--duration-base) var(--ease-spring);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.pattern-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,122,0,0) 0%, rgba(255,122,0,0.04) 100%);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out);
}

.pattern-card:hover {
  border-color: rgba(255, 122, 0, 0.25);
  box-shadow: var(--shadow-glow), var(--shadow-card-hover);
  transform: translateY(-2px);
}

.pattern-card:hover::before { opacity: 1; }

.pattern-card .card-chapter {
  font-size: 10px;
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  font-family: var(--font-mono);
}
.pattern-card .card-name { font-size: 15px; font-weight: 700; margin-bottom: 6px; letter-spacing: -0.02em; }
.pattern-card .card-desc { font-size: 12px; color: var(--text-secondary); line-height: 1.6; }

.pattern-card .card-tags { margin-top: 14px; display: flex; gap: 6px; flex-wrap: wrap; }
.pattern-card .tag {
  font-size: 9px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-dim);
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  border: 1px solid var(--border);
}

/* ── Utility Classes ── */
.text-center   { text-align: center; }
.text-mono     { font-family: var(--font-mono); }
.text-primary  { color: var(--primary); }
.text-success  { color: var(--success); }
.text-danger   { color: var(--danger); }
.text-dim      { color: var(--text-dim); }
.text-secondary { color: var(--text-secondary); }

.mt-6  { margin-top: 6px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8  { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-20 { gap: 20px; }

/* ── Hero Glow (index page) ── */
.hero-glow {
  position: relative;
  overflow: hidden;
}

.hero-glow::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(255,122,0,0.10) 0%, transparent 65%);
  pointer-events: none;
}

/* ── Portal Links ── */
.portal-links { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.portal-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 10px;
  border-radius: var(--radius-md);
  font-size: 11px;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--duration-base) var(--ease-spring);
  font-family: var(--font-sans);
  border: 1px solid var(--border);
  text-align: center;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
}

.portal-link::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--duration-fast);
  pointer-events: none;
}

.portal-link:hover::after { opacity: 1; }

.portal-link.primary {
  background: var(--primary-dim);
  color: var(--primary);
  border-color: rgba(255, 122, 0, 0.25);
}
.portal-link.primary:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.portal-link.secondary {
  background: rgba(255,255,255,0.02);
  color: var(--text-secondary);
}
.portal-link.secondary:hover {
  border-color: var(--border-hover);
  background: rgba(255,255,255,0.04);
  color: var(--text-main);
  transform: translateY(-2px);
}

.portal-link .icon { font-size: 16px; line-height: 1; }

.portal-diagram-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: 11px;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--duration-base) var(--ease-spring);
  font-family: var(--font-sans);
  border: 1px solid rgba(34,211,160,0.2);
  color: var(--success);
  background: rgba(34,211,160,0.06);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
}

.portal-diagram-link:hover {
  background: rgba(34,211,160,0.1);
  border-color: rgba(34,211,160,0.35);
  transform: translateY(-1px);
}

/* ── Sidebar Scrollbar ── */
.sidebar-content::-webkit-scrollbar { width: 5px; }
.sidebar-content::-webkit-scrollbar-track { background: transparent; }
.sidebar-content::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.08);
  border-radius: 10px;
}
.sidebar-content::-webkit-scrollbar-thumb:hover { background: rgba(255,122,0,0.4); }
.light .sidebar-content::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.12); }
.light .sidebar-content::-webkit-scrollbar-thumb:hover { background: rgba(255,122,0,0.4); }

/* ── Animations ── */
@keyframes slideUpFade {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

@keyframes glowPulse {
  0%, 100% { box-shadow: var(--shadow-glow); }
  50%       { box-shadow: var(--shadow-glow-strong); }
}

@keyframes slideRight {
  from { transform: translateX(-16px); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.animate-fadeIn  { animation: fadeIn var(--duration-enter) var(--ease-out) both; }
.animate-pulse   { animation: pulse 2.5s var(--ease-in-out) infinite; }
.animate-glow    { animation: glowPulse 2.5s var(--ease-in-out) infinite; }
.animate-spin    { animation: spin 1s linear infinite; }

/* Staggered children */
.stagger > *:nth-child(1) { animation-delay: 0ms; }
.stagger > *:nth-child(2) { animation-delay: 60ms; }
.stagger > *:nth-child(3) { animation-delay: 120ms; }
.stagger > *:nth-child(4) { animation-delay: 180ms; }
.stagger > *:nth-child(5) { animation-delay: 240ms; }

/* ── Scroll Snap for config panels ── */
.config-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
}
.config-row:last-child { border-bottom: none; }
.config-label { font-size: 13px; color: var(--text-secondary); }
.config-value { font-size: 13px; font-weight: 700; font-variant-numeric: tabular-nums; font-family: var(--font-mono); }

/* ── Footer ── */
.page-footer {
  text-align: center;
  padding-top: 48px;
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.page-footer a { color: var(--primary); text-decoration: none; }
.page-footer a:hover { text-decoration: underline; }

/* ── Print / Diagram Capture Mode ── */
@media print {
  .navbar, .controls, .theme-toggle, .btn, .page-header, .page-footer { display: none !important; }
  .page-container { padding: 0 !important; margin: 0 !important; max-width: none !important; }
  body { background: transparent !important; }
}

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Phát biểu bản quyền dùng chung cho các trang web đơn lẻ.
   Một câu duy nhất, giống nguyên văn ở PDF, LICENSE và CITATION.cff. */
.site-legal {
  /* box-sizing + wrap: nếu không, padding cộng vào 100% width và đẩy trang
     tràn ngang ở 375px (đo được scrollWidth 401 > 375). */
  box-sizing: border-box;
  max-width: 100%;
  padding: 16px;
  text-align: center;
  font-size: 11.5px;
  line-height: 1.5;
  overflow-wrap: anywhere;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
}
.site-legal a {
  color: var(--text-secondary);
  display: inline-flex; align-items: center; min-height: 24px;   /* 2.5.8 */
}

/* Nội dung chỉ dành cho trình đọc màn hình.
   Dùng cho trang nhúng trong iframe: cần một <h1> để điều hướng bằng
   screen reader, nhưng không được thay đổi giao diện đang nhúng. */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}