/* =========================================
   DOCKER HANDWRITTEN NOTES - DYNAMIC EDITION
   Premium design with animations & glassmorphism
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@400;500;600;700&family=Kalam:wght@300;400;700&family=Patrick+Hand&display=swap');

/* ---- CSS Variables ---- */
:root {
  --paper-bg: #fdfaf3;
  --paper-lines: #e8e0cc;
  --spiral-color: #c0a882;
  --ink-dark: #1a1a2e;
  --ink-medium: #2d2d44;
  --blue: #2563eb;
  --blue-light: #dbeafe;
  --red: #dc2626;
  --red-light: #fee2e2;
  --green: #16a34a;
  --green-light: #dcfce7;
  --yellow: #d97706;
  --yellow-light: #fef3c7;
  --purple: #7c3aed;
  --purple-light: #ede9fe;
  --pink-light: #fce7f3;
  --docker-blue: #0db7ed;
  --docker-dark: #003f8e;
  --shadow-notebook: 0 10px 40px rgba(0,0,0,0.25), 0 4px 12px rgba(0,0,0,0.15);
  --glow-blue: 0 0 20px rgba(13, 183, 237, 0.3);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

/* ---- Animated Background ---- */
body {
  font-family: 'Kalam', cursive;
  background: linear-gradient(135deg, #0c1929 0%, #0a1628 25%, #101d35 50%, #0d1f3d 75%, #091428 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 30%, rgba(13, 183, 237, 0.08), transparent),
    radial-gradient(ellipse 500px 350px at 80% 70%, rgba(56, 189, 248, 0.06), transparent),
    radial-gradient(ellipse 400px 300px at 50% 50%, rgba(2, 132, 199, 0.04), transparent);
  pointer-events: none;
  z-index: 0;
  animation: bgPulse 8s ease-in-out infinite alternate;
}

@keyframes bgPulse {
  0%   { opacity: 0.7; }
  50%  { opacity: 1; }
  100% { opacity: 0.8; }
}

/* Floating particles effect */
body::after {
  content: '';
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-image:
    radial-gradient(2px 2px at 10% 20%, rgba(13,183,237,0.4), transparent),
    radial-gradient(2px 2px at 30% 60%, rgba(56,189,248,0.3), transparent),
    radial-gradient(2px 2px at 50% 10%, rgba(125,211,252,0.25), transparent),
    radial-gradient(2px 2px at 70% 80%, rgba(13,183,237,0.35), transparent),
    radial-gradient(2px 2px at 90% 40%, rgba(56,189,248,0.3), transparent),
    radial-gradient(1.5px 1.5px at 15% 85%, rgba(186,230,253,0.2), transparent),
    radial-gradient(1.5px 1.5px at 45% 45%, rgba(13,183,237,0.2), transparent),
    radial-gradient(1.5px 1.5px at 75% 25%, rgba(186,230,253,0.15), transparent),
    radial-gradient(1.5px 1.5px at 85% 65%, rgba(56,189,248,0.2), transparent),
    radial-gradient(1px 1px at 25% 35%, rgba(255,255,255,0.15), transparent),
    radial-gradient(1px 1px at 55% 75%, rgba(255,255,255,0.12), transparent),
    radial-gradient(1px 1px at 65% 15%, rgba(255,255,255,0.1), transparent);
  pointer-events: none;
  z-index: 0;
  animation: floatParticles 20s linear infinite;
}

@keyframes floatParticles {
  0%   { transform: translateY(0); }
  100% { transform: translateY(-30px); }
}

/* ---- Top Bar (Glassmorphism) ---- */
.topbar {
  width: 100%;
  background: rgba(13, 183, 237, 0.08);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(13, 183, 237, 0.15);
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 30px rgba(0,0,0,0.2);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.docker-logo {
  font-size: 30px;
  filter: drop-shadow(0 0 8px #0db7edaa);
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0) rotate(0deg); filter: drop-shadow(0 0 8px #0db7edaa); }
  50%      { transform: translateY(-4px) rotate(3deg); filter: drop-shadow(0 0 18px #0db7edff); }
}

.topbar-title {
  font-family: 'Caveat', cursive;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  text-shadow: 0 2px 10px rgba(13, 183, 237, 0.3);
}

.author-pill {
  font-family: 'Patrick Hand', cursive;
  font-size: 13px;
  font-weight: normal;
  background: linear-gradient(135deg, rgba(13, 183, 237, 0.3), rgba(56, 189, 248, 0.2));
  color: #bae6fd;
  padding: 2px 10px;
  border-radius: 12px;
  border: 1px solid rgba(125, 211, 252, 0.35);
  animation: pillGlow 3s ease-in-out infinite alternate;
}

@keyframes pillGlow {
  from { box-shadow: 0 0 4px rgba(13, 183, 237, 0.2); }
  to   { box-shadow: 0 0 12px rgba(13, 183, 237, 0.4); }
}

.topbar-center .page-indicator {
  font-family: 'Patrick Hand', cursive;
  color: rgba(255,255,255,0.7);
  font-size: 14px;
}

.topbar-right { display: flex; gap: 10px; }

.nav-btn {
  font-family: 'Caveat', cursive;
  font-size: 15px;
  font-weight: 700;
  background: rgba(255,255,255,0.07);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 10px;
  padding: 6px 16px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.nav-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,183,237,0.15), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.nav-btn:hover:not(:disabled)::after { opacity: 1; }

.nav-btn:hover:not(:disabled) {
  background: rgba(255,255,255,0.12);
  border-color: rgba(13, 183, 237, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(13, 183, 237, 0.25);
}

.nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }

.home-link-btn {
  font-family: 'Caveat', cursive;
  font-size: 16px;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  padding: 5px 12px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.home-link-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: #38bdf8;
  color: #38bdf8;
  transform: translateY(-1px);
}

.drawer-toggle-btn {
  background: linear-gradient(135deg, rgba(13, 183, 237, 0.25), rgba(8, 145, 178, 0.25));
  border-color: rgba(13, 183, 237, 0.45);
  color: #bae6fd;
}

.drawer-toggle-btn:hover {
  background: linear-gradient(135deg, rgba(13, 183, 237, 0.4), rgba(8, 145, 178, 0.4));
  border-color: #38bdf8;
}

.pdf-btn {
  background: linear-gradient(135deg, #0db7ed, #0891b2, #0284c7);
  background-size: 200% 200%;
  border-color: #67e8f9;
  color: #fff;
  font-weight: 700;
  box-shadow: 0 2px 12px rgba(13, 183, 237, 0.4);
  animation: gradientShift 4s ease infinite;
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.pdf-btn:hover:not(:disabled) {
  box-shadow: 0 4px 20px rgba(13, 183, 237, 0.6);
  transform: translateY(-2px) scale(1.02);
}

/* =========================================
   TOPIC SIDENAV DRAWER (SLIDE-OVER)
   ========================================= */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.sidebar-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.sidebar-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 360px;
  max-width: 88vw;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.98) 0%, rgba(2, 6, 23, 0.98) 100%);
  border-right: 1px solid rgba(13, 183, 237, 0.2);
  box-shadow: 10px 0 40px rgba(0, 0, 0, 0.6);
  z-index: 999;
  transform: translateX(-100%);
  transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  color: #f8fafc;
  overflow: hidden;
}

.sidebar-drawer.open {
  transform: translateX(0);
}

.sidebar-header {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
}

.sidebar-home-link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: #f8fafc;
  font-family: 'Caveat', cursive;
  font-size: 22px;
  font-weight: 700;
  transition: all 0.2s ease;
  padding: 4px 10px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.sidebar-home-link:hover {
  background: rgba(255, 255, 255, 0.18);
  color: #38bdf8;
  transform: translateY(-1px);
}

.sidebar-close-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #cbd5e1;
  font-size: 22px;
  line-height: 1;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.sidebar-close-btn:hover {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
  border-color: rgba(239, 68, 68, 0.4);
}

.sidebar-section {
  padding: 14px 18px 6px;
}

.section-label {
  font-family: 'Patrick Hand', cursive;
  font-size: 12px;
  letter-spacing: 1px;
  color: #94a3b8;
  margin-bottom: 8px;
  font-weight: 600;
}

/* Notebook Switcher Grid */
.notebook-switcher-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.switcher-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  text-decoration: none;
  color: #e2e8f0;
  transition: all 0.2s ease;
}

.switcher-card:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.switcher-card.active {
  background: linear-gradient(135deg, rgba(13, 183, 237, 0.25), rgba(2, 132, 199, 0.25));
  border-color: #38bdf8;
  color: #fff;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.switcher-icon {
  font-size: 20px;
}

.switcher-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.switcher-title {
  font-family: 'Caveat', cursive;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.switcher-pages {
  font-family: 'Patrick Hand', cursive;
  font-size: 11px;
  color: #94a3b8;
}

/* Search Box */
.sidebar-search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.sidebar-search-box .search-icon {
  position: absolute;
  left: 10px;
  font-size: 14px;
  pointer-events: none;
  opacity: 0.6;
}

.sidebar-search-box input {
  width: 100%;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 8px 32px 8px 32px;
  font-family: 'Kalam', cursive;
  font-size: 14px;
  color: #f8fafc;
  outline: none;
  transition: all 0.2s ease;
}

.sidebar-search-box input:focus {
  background: rgba(255, 255, 255, 0.12);
  border-color: #38bdf8;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
}

.clear-search-btn {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
}

/* Topics List */
.sidebar-topics-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sidebar-topic-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  color: #f1f5f9;
}

.sidebar-topic-item:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateX(4px);
}

.sidebar-topic-item.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: #38bdf8;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.topic-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.topic-num-badge {
  font-family: 'Caveat', cursive;
  font-size: 14px;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.1);
  padding: 2px 8px;
  border-radius: 12px;
  color: #cbd5e1;
  flex-shrink: 0;
}

.sidebar-topic-item.active .topic-num-badge {
  background: #38bdf8;
  color: #0f172a;
}

.topic-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topic-title {
  font-family: 'Caveat', cursive;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topic-subtitle {
  font-family: 'Patrick Hand', cursive;
  font-size: 12px;
  color: #94a3b8;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topic-tag-pill {
  font-family: 'Patrick Hand', cursive;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  flex-shrink: 0;
  margin-left: 8px;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: rgba(255, 255, 255, 0.02);
}

.sidebar-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  font-family: 'Caveat', cursive;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.sidebar-action-btn.pdf-btn {
  background: linear-gradient(135deg, rgba(13, 183, 237, 0.4), rgba(2, 132, 199, 0.4));
  color: #e0f2fe;
  border-color: rgba(56, 189, 248, 0.5);
}

.sidebar-action-btn.home-btn {
  background: rgba(255, 255, 255, 0.08);
  color: #cbd5e1;
}

.sidebar-action-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.15);
}

/* ---- Dot Navigation ---- */
.dot-nav {
  display: flex;
  gap: 12px;
  margin: 14px 0 10px;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  cursor: pointer;
  border: none;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.dot.active {
  background: var(--docker-blue);
  transform: scale(1.5);
  box-shadow: 0 0 14px rgba(13, 183, 237, 0.7), 0 0 40px rgba(13, 183, 237, 0.2);
}

.dot:hover:not(.active) {
  background: rgba(13, 183, 237, 0.5);
  transform: scale(1.3);
}

/* ---- Notebook Container ---- */
.notebook-container {
  width: 100%;
  max-width: 840px;
  padding: 8px 16px 40px;
  position: relative;
  scroll-margin-top: 80px;
  z-index: 1;
}

/* ---- Page Transitions ---- */
.notebook-page {
  display: none;
  animation: pageIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.notebook-page.active { display: block; }

@keyframes pageIn {
  from { opacity: 0; transform: translateY(24px) scale(0.96) rotateX(2deg); }
  to   { opacity: 1; transform: translateY(0) scale(1) rotateX(0deg); }
}

/* ---- Notebook Inner (Paper) ---- */
.notebook-inner {
  background: var(--paper-bg);
  border-radius: 4px 14px 14px 4px;
  box-shadow:
    var(--shadow-notebook),
    0 0 60px rgba(13, 183, 237, 0.08),
    inset 0 0 80px rgba(255, 252, 235, 0.3);
  display: flex;
  position: relative;
  overflow: hidden;
  background-image:
    repeating-linear-gradient(
      transparent,
      transparent 26px,
      var(--paper-lines) 26px,
      var(--paper-lines) 27px
    );
  background-size: 100% 27px;
  background-position: 0 44px;
  transition: box-shadow 0.4s ease;
}

.notebook-inner:hover {
  box-shadow:
    0 14px 50px rgba(0,0,0,0.3),
    0 6px 16px rgba(0,0,0,0.18),
    0 0 80px rgba(13, 183, 237, 0.12);
}

.notebook-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(255,252,235,0.5) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* Subtle shimmer effect on paper */
.notebook-inner::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 40%,
    rgba(255, 255, 255, 0.03) 45%,
    rgba(255, 255, 255, 0.05) 50%,
    rgba(255, 255, 255, 0.03) 55%,
    transparent 60%
  );
  animation: shimmer 8s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes shimmer {
  0%   { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
  100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

/* ---- Spiral Holes ---- */
.spiral-holes {
  width: 38px;
  min-width: 38px;
  background: linear-gradient(180deg, #c9a87a 0%, #d4b896 30%, #c0a070 70%, #b89060 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  padding: 16px 0;
  border-right: 2.5px solid #a07848;
  border-radius: 4px 0 0 4px;
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  box-shadow: inset -3px 0 8px rgba(0,0,0,0.08);
}

.hole {
  width: 18px;
  height: 18px;
  background: radial-gradient(circle at 40% 35%, #1a2a4a 0%, #0a1428 80%);
  border-radius: 50%;
  border: 2.5px solid #7a6040;
  box-shadow:
    inset 0 2px 5px rgba(0,0,0,0.6),
    inset 0 -1px 3px rgba(255,255,255,0.1),
    0 1px 3px rgba(255,255,255,0.25);
  transition: transform 0.3s ease;
}

.notebook-inner:hover .hole {
  box-shadow:
    inset 0 2px 5px rgba(0,0,0,0.6),
    inset 0 -1px 3px rgba(255,255,255,0.1),
    0 1px 3px rgba(255,255,255,0.25),
    0 0 6px rgba(13, 183, 237, 0.2);
}

/* ---- Page Content ---- */
.page-content {
  flex: 1;
  padding: 18px 22px 16px 20px;
  position: relative;
  z-index: 1;
  min-height: 700px;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.author-tag {
  font-family: 'Patrick Hand', cursive;
  font-size: 11px;
  color: #999;
  transition: color 0.3s ease;
}

.page-content:hover .author-tag { color: #0891b2; }

.page-num {
  font-family: 'Patrick Hand', cursive;
  font-size: 12px;
  color: #aaa;
  background: linear-gradient(135deg, #f0e8d0, #e8dfc0);
  border-radius: 12px;
  padding: 2px 10px;
  border: 1px solid #d4c49a;
  transition: all 0.3s ease;
}

.page-content:hover .page-num {
  background: linear-gradient(135deg, #e0f2fe, #bae6fd);
  border-color: #7dd3fc;
  color: #0284c7;
}

.page-footer {
  font-family: 'Patrick Hand', cursive;
  font-size: 11px;
  color: #aaa;
  text-align: center;
  margin-top: 14px;
  border-top: 1px dashed #d4c49a;
  padding-top: 8px;
}

/* ---- Page Title ---- */
.page-title {
  font-family: 'Caveat', cursive;
  font-size: 34px;
  font-weight: 700;
  color: var(--ink-dark);
  text-align: center;
  margin-bottom: 14px;
  position: relative;
  line-height: 1.15;
}

.title-underline {
  display: block;
  height: 3px;
  background: linear-gradient(90deg, transparent 5%, #0db7ed 25%, #38bdf8 50%, #0db7ed 75%, transparent 95%);
  border-radius: 2px;
  margin: 2px auto 0;
  width: 65%;
  animation: underlineGlow 3s ease-in-out infinite alternate;
}

@keyframes underlineGlow {
  from { opacity: 0.7; box-shadow: 0 0 4px rgba(13,183,237,0.3); }
  to   { opacity: 1; box-shadow: 0 0 12px rgba(13,183,237,0.5); }
}

/* ---- Highlights ---- */
.highlight-blue   { color: var(--blue); font-weight: 700; transition: text-shadow 0.3s ease; }
.highlight-red    { color: var(--red); font-weight: 700; }
.highlight-green  { color: var(--green); font-weight: 700; }
.highlight-yellow { color: var(--yellow); font-weight: 700; }
.highlight-purple { color: var(--purple); font-weight: 700; }

.highlight-blue:hover   { text-shadow: 0 0 8px rgba(37, 99, 235, 0.4); }
.highlight-red:hover    { text-shadow: 0 0 8px rgba(220, 38, 38, 0.4); }
.highlight-green:hover  { text-shadow: 0 0 8px rgba(22, 163, 74, 0.4); }
.highlight-yellow:hover { text-shadow: 0 0 8px rgba(217, 119, 6, 0.4); }
.highlight-purple:hover { text-shadow: 0 0 8px rgba(124, 58, 237, 0.4); }

/* ---- Section Block ---- */
.section-block {
  margin-bottom: 14px;
  position: relative;
  padding-left: 4px;
}

.section-num-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--ink-dark), #2d3a5e);
  color: #fff;
  border-radius: 50%;
  font-family: 'Caveat', cursive;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
}

.section-block:hover .section-num-circle {
  background: linear-gradient(135deg, #0284c7, #0db7ed);
  transform: scale(1.1);
  box-shadow: 0 2px 10px rgba(13, 183, 237, 0.4);
}

.section-title {
  font-family: 'Caveat', cursive;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-medium);
  display: inline-block;
  margin-left: 6px;
  margin-bottom: 6px;
  transition: color 0.3s ease;
}

.section-block:hover .section-title { color: #0284c7; }

/* ---- Handwritten List ---- */
.handwritten-list {
  list-style: none;
  padding-left: 8px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-medium);
}

.handwritten-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 2px;
  transition: transform 0.2s ease, background 0.2s ease;
  border-radius: 4px;
  padding-top: 1px;
  padding-bottom: 1px;
}

.handwritten-list li:hover {
  transform: translateX(4px);
  background: rgba(13, 183, 237, 0.04);
}

.handwritten-list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 8px;
  width: 6px;
  height: 6px;
  background: linear-gradient(135deg, #0db7ed, #38bdf8);
  border-radius: 50%;
  box-shadow: 0 0 4px rgba(13, 183, 237, 0.4);
  transition: transform 0.2s ease;
}

.handwritten-list li:hover::before {
  transform: scale(1.4);
  box-shadow: 0 0 8px rgba(13, 183, 237, 0.6);
}

.handwritten-list code {
  background: rgba(13, 183, 237, 0.1);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 12px;
  border: 1px solid rgba(13, 183, 237, 0.15);
}

/* ---- Two Column Layout ---- */
.two-col { display: flex; gap: 14px; flex-wrap: wrap; }
.col-left, .col-right { flex: 1; min-width: 160px; }

/* ---- Diagram Box ---- */
.diagram-box {
  background: linear-gradient(135deg, #f8f4ea, #f0e8d0);
  border: 1.5px solid #ddd0b0;
  border-radius: 10px;
  padding: 10px;
  text-align: center;
  transition: all 0.3s ease;
}

.diagram-box:hover {
  border-color: #7dd3fc;
  box-shadow: 0 4px 16px rgba(13, 183, 237, 0.12);
}

.diagram-title {
  font-family: 'Caveat', cursive;
  font-size: 14px;
  font-weight: 700;
  color: #555;
  margin-bottom: 8px;
  border-bottom: 1px dashed #ccc;
  padding-bottom: 4px;
}

.stack-diagram { display: flex; flex-direction: column; align-items: center; gap: 3px; }

.stack-layer {
  width: 100%;
  max-width: 180px;
  padding: 5px 10px;
  border-radius: 7px;
  font-size: 12.5px;
  font-weight: 600;
  border: 1.5px solid;
  transition: all 0.3s ease;
}

.stack-layer:hover {
  transform: scale(1.05);
  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.layer-app   { background: var(--blue-light); border-color: #93c5fd; color: #1e40af; }
.layer-pod   { background: var(--green-light); border-color: #86efac; color: #166534; }
.layer-k8s   { background: var(--yellow-light); border-color: #fcd34d; color: #92400e; }
.layer-infra { background: var(--purple-light); border-color: #c4b5fd; color: #5b21b6; }

.stack-arrow { font-size: 12px; color: #888; line-height: 1; font-family: 'Patrick Hand', cursive; }

/* ---- Feature Grid ---- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }

.feature-card {
  background: linear-gradient(135deg, #f8f4ea, #f0e8d0);
  border: 1.5px solid #e0d5b5;
  border-radius: 10px;
  padding: 10px 8px;
  text-align: center;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, #0db7ed, #38bdf8, #7dd3fc);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.feature-card:hover {
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 8px 25px rgba(13, 183, 237, 0.15);
  border-color: #7dd3fc;
}

.feature-icon {
  font-size: 24px;
  margin-bottom: 4px;
  transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon { transform: scale(1.2) rotate(5deg); }

.feature-label { font-family: 'Caveat', cursive; font-size: 14px; font-weight: 700; color: #0284c7; margin-bottom: 2px; }
.feature-desc { font-size: 10.5px; color: #555; line-height: 1.35; }

/* ---- Remember Box ---- */
.remember-box {
  background: linear-gradient(135deg, #fffde7, #fff9c4, #fef3c7);
  border: 1.5px solid #f9d73e;
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 10px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.remember-box::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, #f59e0b, #fbbf24, #f59e0b);
  border-radius: 10px 0 0 10px;
}

.remember-box:hover {
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.15);
  transform: translateY(-1px);
}

.remember-title { font-family: 'Caveat', cursive; font-size: 16px; font-weight: 700; color: #92400e; margin-bottom: 5px; }
.remember-items { display: flex; flex-direction: column; gap: 3px; }
.remember-item { font-size: 12.5px; color: #78350f; line-height: 1.4; padding-left: 4px; }
.remember-item code { background: rgba(217, 119, 6, 0.12); padding: 1px 5px; border-radius: 4px; font-family: monospace; font-size: 11px; }

/* ---- Tip Box ---- */
.tip-box {
  background: linear-gradient(135deg, #f0fdf4, #dcfce7, #bbf7d0);
  border: 1.5px solid #86efac;
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 10px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.tip-box::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, #16a34a, #4ade80, #16a34a);
  border-radius: 10px 0 0 10px;
}

.tip-box:hover {
  box-shadow: 0 4px 16px rgba(22, 163, 74, 0.15);
  transform: translateY(-1px);
}

.tip-title { font-family: 'Caveat', cursive; font-size: 16px; font-weight: 700; color: #166534; margin-bottom: 5px; }
.tip-content { font-size: 12px; color: #14532d; line-height: 1.55; }
.tip-content code { background: rgba(22, 163, 74, 0.1); padding: 1px 6px; border-radius: 4px; font-family: monospace; font-size: 11px; border: 1px solid rgba(22, 163, 74, 0.15); }

/* ---- Architecture Diagram ---- */
.arch-diagram {
  background: linear-gradient(135deg, #f8f4ea, #f0e8d0);
  border: 1.5px solid #ddd0b0;
  border-radius: 12px;
  padding: 12px;
  margin-bottom: 8px;
  transition: all 0.3s ease;
}

.arch-diagram:hover {
  border-color: #7dd3fc;
  box-shadow: 0 4px 20px rgba(13, 183, 237, 0.1);
}

.arch-cluster { display: flex; flex-direction: column; align-items: center; gap: 6px; }

.arch-control-plane {
  background: linear-gradient(135deg, #fef9c3, #fef08a);
  border: 2px solid #f59e0b;
  border-radius: 10px;
  padding: 8px 14px;
  width: 100%;
  text-align: center;
  transition: all 0.3s ease;
}

.arch-control-plane:hover { transform: scale(1.01); box-shadow: 0 3px 12px rgba(245, 158, 11, 0.2); }

.arch-cp-title { font-family: 'Caveat', cursive; font-size: 14px; font-weight: 700; color: #78350f; margin-bottom: 6px; }
.arch-cp-components { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }

.arch-comp {
  font-size: 11px;
  font-weight: 600;
  padding: 4px 9px;
  border-radius: 6px;
  border: 1.5px solid;
  transition: all 0.25s ease;
  cursor: default;
}

.arch-comp:hover { transform: translateY(-2px); box-shadow: 0 3px 8px rgba(0,0,0,0.12); }

.arch-comp.yellow { background: #fef3c7; border-color: #fcd34d; color: #92400e; }
.arch-comp.green  { background: var(--green-light); border-color: #86efac; color: #166534; }
.arch-comp.blue   { background: var(--blue-light); border-color: #93c5fd; color: #1e40af; }
.arch-comp.pink   { background: var(--pink-light); border-color: #f9a8d4; color: #831843; }

.arch-arrow-down { font-size: 12px; color: #888; font-family: 'Patrick Hand', cursive; }

.arch-workers { display: flex; gap: 10px; width: 100%; justify-content: center; }

.arch-node {
  flex: 1;
  max-width: 180px;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border: 2px solid #93c5fd;
  border-radius: 10px;
  padding: 8px;
  text-align: center;
  transition: all 0.3s ease;
}

.arch-node:hover { transform: translateY(-2px); box-shadow: 0 4px 14px rgba(59, 130, 246, 0.15); }

.arch-node-title { font-family: 'Caveat', cursive; font-size: 13px; font-weight: 700; color: #1e40af; margin-bottom: 5px; }
.arch-node-comp { font-size: 10.5px; background: rgba(255,255,255,0.6); border-radius: 5px; padding: 2px 6px; margin-bottom: 3px; color: #374151; border: 1px solid #bfdbfe; }
.arch-pods-row { display: flex; gap: 5px; justify-content: center; margin-top: 5px; flex-wrap: wrap; }

.mini-pod {
  background: linear-gradient(135deg, #0284c7, #0db7ed);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 5px;
  font-family: 'Patrick Hand', cursive;
  transition: all 0.25s ease;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.3);
}

.mini-pod:hover { transform: translateY(-2px) scale(1.05); box-shadow: 0 4px 10px rgba(13, 183, 237, 0.4); }

/* ---- Compare Table ---- */
.compare-table {
  border: 1.5px solid #ddd0b0;
  border-radius: 10px;
  overflow: hidden;
  font-size: 12.5px;
  transition: all 0.3s ease;
}

.compare-table:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); }

.compare-header { display: flex; }
.compare-col-header { flex: 1; padding: 7px 10px; font-family: 'Caveat', cursive; font-size: 14px; font-weight: 700; text-align: center; }
.compare-blue   { background: linear-gradient(135deg, #dbeafe, #bfdbfe); color: #1e40af; }
.compare-green  { background: linear-gradient(135deg, #dcfce7, #bbf7d0); color: #166534; }
.compare-yellow { background: linear-gradient(135deg, #fef3c7, #fde68a); color: #92400e; }

.compare-row {
  display: flex;
  border-top: 1px solid #e5dfc8;
  transition: background 0.2s ease;
}

.compare-row:hover { background: rgba(13, 183, 237, 0.03); }
.compare-row:nth-child(even) { background: rgba(0,0,0,0.015); }
.compare-row:nth-child(even):hover { background: rgba(13, 183, 237, 0.04); }

.compare-cell { flex: 1; padding: 5px 10px; color: var(--ink-medium); border-right: 1px solid #e5dfc8; line-height: 1.35; }
.compare-cell:last-child { border-right: none; }
.compare-cell code { background: rgba(13, 183, 237, 0.08); padding: 1px 5px; border-radius: 4px; font-family: monospace; font-size: 10.5px; border: 1px solid rgba(13, 183, 237, 0.12); }
.svc-type { font-family: 'Caveat', cursive; font-size: 14px; font-weight: 700; color: #0284c7; }

/* ---- Pod Diagram ---- */
.pod-diagram { text-align: center; margin-top: 8px; }

.pod-box {
  display: inline-block;
  background: linear-gradient(135deg, #ecfeff, #cffafe);
  border: 2px solid #67e8f9;
  border-radius: 12px;
  padding: 8px 14px;
  min-width: 130px;
  transition: all 0.3s ease;
}

.pod-box:hover { transform: translateY(-3px); box-shadow: 0 6px 18px rgba(6, 182, 212, 0.2); }

.pod-label { font-family: 'Caveat', cursive; font-size: 15px; font-weight: 700; color: #0e7490; margin-bottom: 6px; }
.pod-inner { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }

.container-box {
  background: linear-gradient(135deg, #0891b2, #06b6d4);
  color: #fff;
  font-size: 11px;
  padding: 4px 9px;
  border-radius: 6px;
  font-weight: 600;
  box-shadow: 0 2px 4px rgba(8, 145, 178, 0.3);
  transition: all 0.25s ease;
}

.container-box:hover { transform: scale(1.05); box-shadow: 0 3px 10px rgba(8, 145, 178, 0.4); }

.pod-share { font-size: 10px; color: #0e7490; margin-top: 5px; font-family: 'Patrick Hand', cursive; }

/* ---- Deployment Diagram ---- */
.deploy-diagram {
  text-align: center;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border: 1.5px solid #bfdbfe;
  border-radius: 12px;
  padding: 8px;
  margin-top: 8px;
  transition: all 0.3s ease;
}

.deploy-diagram:hover { box-shadow: 0 4px 16px rgba(59, 130, 246, 0.12); }

.deploy-label { font-family: 'Caveat', cursive; font-size: 15px; font-weight: 700; color: #1e40af; background: linear-gradient(135deg, #dbeafe, #bfdbfe); display: inline-block; padding: 3px 12px; border-radius: 6px; border: 1.5px solid #93c5fd; }
.deploy-arrow { font-size: 11px; color: #888; margin: 3px 0; font-family: 'Patrick Hand', cursive; }
.pods-row { display: flex; gap: 6px; justify-content: center; margin-top: 5px; }

.mini-pod-green {
  background: linear-gradient(135deg, #0284c7, #0db7ed);
  color: #fff;
  font-size: 10.5px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 6px;
  font-family: 'Patrick Hand', cursive;
  text-align: center;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.3);
  transition: all 0.25s ease;
}

.mini-pod-green:hover { transform: translateY(-2px); box-shadow: 0 4px 10px rgba(13, 183, 237, 0.4); }

/* ---- Lifecycle Row ---- */
.lifecycle-row { display: flex; align-items: center; flex-wrap: wrap; gap: 5px; justify-content: center; }

.lifecycle-step {
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 11.5px;
  font-weight: 600;
  text-align: center;
  line-height: 1.3;
  border: 1.5px solid;
  transition: all 0.3s ease;
}

.lifecycle-step:hover { transform: translateY(-3px) scale(1.05); }

.lifecycle-step small { font-size: 9.5px; display: block; font-weight: 400; }
.step-pending   { background: #fef3c7; border-color: #fcd34d; color: #78350f; }
.step-running   { background: #dcfce7; border-color: #86efac; color: #166534; }
.step-succeeded { background: #dbeafe; border-color: #93c5fd; color: #1e40af; }
.step-failed    { background: #fee2e2; border-color: #fca5a5; color: #7f1d1d; }
.step-pending:hover   { box-shadow: 0 4px 12px rgba(252, 211, 77, 0.4); }
.step-running:hover   { box-shadow: 0 4px 12px rgba(134, 239, 172, 0.4); }
.step-succeeded:hover { box-shadow: 0 4px 12px rgba(147, 197, 253, 0.4); }
.step-failed:hover    { box-shadow: 0 4px 12px rgba(252, 165, 165, 0.4); }

.lifecycle-arrow { font-size: 18px; color: #888; transition: color 0.3s ease; }
.lifecycle-row:hover .lifecycle-arrow { color: #0db7ed; }
.lifecycle-or    { font-size: 14px; color: #888; font-family: 'Patrick Hand', cursive; }

/* ---- Code Snippet ---- */
.code-snippet {
  background: linear-gradient(135deg, #1e1e2e, #181825);
  border-radius: 10px;
  padding: 10px 14px;
  margin-top: 8px;
  font-family: 'Courier New', monospace;
  border: 1px solid rgba(13, 183, 237, 0.15);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.code-snippet::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, #0db7ed, #38bdf8, #7dd3fc, #38bdf8, #0db7ed);
  background-size: 200% 100%;
  animation: codeGlow 3s linear infinite;
}

@keyframes codeGlow {
  0%   { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

.code-snippet:hover { box-shadow: 0 4px 20px rgba(13, 183, 237, 0.15); border-color: rgba(13, 183, 237, 0.3); }

.code-line { font-size: 11.5px; color: #cdd6f4; line-height: 1.7; }
.code-key { color: #89b4fa; font-weight: 600; }

/* ---- Volume Cards ---- */
.volumes-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }

.volume-card {
  background: linear-gradient(135deg, #ecfeff, #cffafe);
  border: 1.5px solid #67e8f9;
  border-radius: 10px;
  padding: 8px;
  text-align: center;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.volume-card:hover { transform: translateY(-4px) scale(1.02); box-shadow: 0 6px 18px rgba(6, 182, 212, 0.2); border-color: #22d3ee; }
.vol-name { font-family: 'Caveat', cursive; font-size: 14px; font-weight: 700; color: #0e7490; margin-bottom: 4px; }
.vol-desc { font-size: 10.5px; color: #155e75; line-height: 1.3; }

/* ---- Command Grid ---- */
.cmd-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }

.cmd-card {
  background: linear-gradient(135deg, #1e1e2e, #181825);
  border-radius: 8px;
  padding: 8px 10px;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.cmd-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: #0db7ed;
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.cmd-card:hover {
  transform: translateY(-3px);
  border-color: rgba(13, 183, 237, 0.2);
  box-shadow: 0 4px 14px rgba(13, 183, 237, 0.15);
}

.cmd-code { font-family: 'Courier New', monospace; font-size: 11px; color: #a6e3a1; margin-bottom: 3px; word-break: break-all; }
.cmd-desc { font-size: 10.5px; color: #cdd6f4; font-family: 'Patrick Hand', cursive; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .topbar {
    padding: 8px 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 10px;
    align-items: center;
  }

  .topbar-left {
    flex: 1 1 auto;
    min-width: 0;
    gap: 8px;
  }

  .docker-logo {
    font-size: 24px;
  }

  .topbar-title {
    font-size: 18px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .author-pill {
    display: none;
  }

  .topbar-right {
    flex: 0 0 auto;
    display: flex;
    gap: 6px;
  }

  .topbar-center {
    order: 3;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    padding-top: 6px;
    border-top: 1px solid rgba(13, 183, 237, 0.15);
  }

  .nav-btn {
    font-size: 14px;
    padding: 5px 12px;
    border-radius: 6px;
  }

  .page-indicator {
    font-size: 14px;
    padding: 3px 12px;
  }

  .notebook-container {
    padding: 6px 8px 30px;
  }

  .spiral-holes {
    width: 24px;
    min-width: 24px;
    padding: 12px 0;
  }

  .hole {
    width: 10px;
    height: 10px;
  }

  .hole::before {
    left: -6px;
    width: 14px;
    height: 4px;
  }

  .page-content {
    padding: 14px 10px 18px 12px;
  }

  .page-title {
    font-size: 24px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .volumes-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .cmd-grid {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .two-col {
    flex-direction: column;
    gap: 10px;
  }
}

/* =========================================
   PRINT / PDF EXPORT STYLES
   ========================================= */
@media print {
  @page { size: A4 portrait; margin: 10mm; }

  html, body {
    background: #fff !important;
    color: #1a1a2e !important;
    font-size: 11pt !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  body::before, body::after { display: none !important; }

  .topbar, .dot-nav, .nav-btn, .page-indicator, .sidebar-backdrop, .sidebar-drawer { display: none !important; }
  .app, .notebook-container { width: 100% !important; max-width: 100% !important; padding: 0 !important; margin: 0 !important; }

  .notebook-page {
    display: block !important;
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
    page-break-after: always !important;
    break-after: page !important;
    page-break-inside: avoid !important;
    break-inside: avoid !important;
    margin: 0 0 20px 0 !important;
    box-shadow: none !important;
  }

  .notebook-page:last-child { page-break-after: auto !important; break-after: auto !important; }

  .notebook-inner {
    box-shadow: none !important;
    border: 1.5px solid #d4c49a !important;
    border-radius: 8px !important;
    page-break-inside: avoid !important;
    break-inside: avoid !important;
    min-height: 265mm !important;
  }

  .notebook-inner::after { display: none !important; }
  .page-content { min-height: auto !important; }

  .feature-card, .diagram-box, .arch-diagram, .compare-table, .remember-box, .tip-box, .code-snippet, .volume-card, .cmd-card {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
    box-shadow: none !important;
    transform: none !important;
  }

  * { animation: none !important; transition: none !important; }
}