* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #1a1a2e;
  color: #e0e0e0;
  line-height: 1.6;
}

/* NAV */
nav {
  background: #16213e;
  padding: 10px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid #0f3460;
  overflow-x: auto;
  white-space: nowrap;
}

nav a {
  color: #a8d8ea;
  text-decoration: none;
  padding: 8px 14px;
  font-size: 14px;
  border-radius: 4px;
  display: inline-block;
  margin: 2px;
}

nav a:hover, nav a.active {
  background: #0f3460;
  color: #fff;
}

nav a.logo {
  font-weight: bold;
  font-size: 18px;
  color: #4cc9f0;
  letter-spacing: 1px;
}

nav a.logo:hover {
  background: none;
}

/* LAYOUT */
.hero {
  background: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
  padding: 40px 20px;
  text-align: center;
  border-bottom: 3px solid #4cc9f0;
}

.hero h1 {
  font-size: 2.5em;
  color: #4cc9f0;
  margin-bottom: 5px;
}

.hero p {
  font-size: 1.1em;
  color: #a8d8ea;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

.section {
  display: none;
}

.section.active {
  display: block;
}

/* SECTION HEADERS */
h2 {
  color: #4cc9f0;
  font-size: 1.6em;
  margin: 30px 0 15px;
  padding-bottom: 8px;
  border-bottom: 2px solid #0f3460;
}

h3 {
  color: #f72585;
  font-size: 1.3em;
  margin: 25px 0 10px;
}

h4 {
  color: #7209b7;
  font-size: 1.1em;
  margin: 20px 0 8px;
}

/* TABLES */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 15px 0;
  font-size: 14px;
}

table th {
  background: #0f3460;
  color: #4cc9f0;
  padding: 10px 12px;
  text-align: left;
  font-weight: 600;
  border: 1px solid #16213e;
}

table td {
  padding: 8px 12px;
  border: 1px solid #2a2a4a;
}

table tr:nth-child(even) {
  background: #1a1a2e;
}

table tr:hover {
  background: #0f3460;
}

/* PRICE TABLES */
.price-section {
  background: #16213e;
  border: 1px solid #0f3460;
  border-radius: 8px;
  padding: 20px;
  margin: 15px 0;
}

.price-section h3 {
  color: #4cc9f0;
  border-bottom: 1px solid #0f3460;
  padding-bottom: 8px;
}

.price-highlight {
  color: #4cc9f0;
  font-weight: bold;
}

/* CHECKLISTS */
.checklist {
  list-style: none;
  padding: 0;
}

.checklist li {
  padding: 6px 0 6px 30px;
  position: relative;
  border-bottom: 1px solid #2a2a4a;
  font-size: 14px;
}

.checklist li::before {
  content: "☐";
  position: absolute;
  left: 5px;
  color: #4cc9f0;
  font-size: 16px;
}

.checklist li.checked {
  color: #555;
  text-decoration: line-through;
}

.checklist li.checked::before {
  content: "☑";
  color: #4cc9f0;
}

/* SUB-CHECKLIST */
.checklist li ul {
  list-style: none;
  padding-left: 20px;
  margin-top: 4px;
}

.checklist li ul li::before {
  content: "☐";
  font-size: 13px;
}

.checklist li ul li {
  border-bottom: 1px dotted #2a2a4a;
  font-size: 13px;
}

/* WEEK HEADERS */
.week-header {
  background: linear-gradient(90deg, #0f3460, #16213e);
  color: #4cc9f0;
  padding: 12px 15px;
  font-size: 1.2em;
  font-weight: bold;
  border-radius: 6px;
  margin: 25px 0 10px;
  border-left: 4px solid #f72585;
}

.day-header {
  background: #1a1a2e;
  color: #a8d8ea;
  padding: 10px 15px;
  font-size: 1em;
  font-weight: bold;
  margin: 15px 0 5px;
  border-left: 4px solid #7209b7;
  border-radius: 0 4px 4px 0;
}

/* INFO BOXES */
.info-box {
  background: #16213e;
  border-left: 4px solid #4cc9f0;
  padding: 15px;
  margin: 15px 0;
  border-radius: 0 6px 6px 0;
}

.info-box strong {
  color: #4cc9f0;
}

.warning-box {
  background: #2e1a1a;
  border-left: 4px solid #f72585;
  padding: 15px;
  margin: 15px 0;
  border-radius: 0 6px 6px 0;
}

.warning-box strong {
  color: #f72585;
}

.tip-box {
  background: #1a2e1a;
  border-left: 4px solid #06d6a0;
  padding: 15px;
  margin: 15px 0;
  border-radius: 0 6px 6px 0;
}

.tip-box strong {
  color: #06d6a0;
}

/* GRID LAYOUTS */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin: 15px 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 15px;
  margin: 15px 0;
}

.card {
  background: #16213e;
  border: 1px solid #0f3460;
  border-radius: 8px;
  padding: 15px;
}

.card h4 {
  color: #4cc9f0;
  margin-bottom: 8px;
}

/* CODE/PRE */
pre, code {
  background: #0d1117;
  border-radius: 4px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
}

pre {
  padding: 15px;
  overflow-x: auto;
  margin: 10px 0;
  border: 1px solid #2a2a4a;
}

code {
  padding: 2px 6px;
}

/* QUICK REFERENCE */
.quick-ref {
  background: #16213e;
  border: 2px solid #4cc9f0;
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
}

.quick-ref h3 {
  color: #4cc9f0;
  text-align: center;
  margin-bottom: 15px;
}

/* PRINT */
@media print {
  nav { display: none; }
  .hero { padding: 10px; }
  .section { display: block !important; page-break-before: always; }
  body { background: white; color: black; }
  table th { background: #333; color: white; }
  .price-section, .info-box, .warning-box, .tip-box, .card, .quick-ref {
    border: 1px solid #ccc;
    background: #f9f9f9;
  }
}

/* MOBILE */
@media (max-width: 768px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  nav a {
    padding: 6px 10px;
    font-size: 12px;
  }
  .hero h1 {
    font-size: 1.5em;
  }
}