/* ============================================
   Base & Reset
   ============================================ */
*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 62.5%;
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", "HelveticaNeue", "Helvetica Neue", Arial, sans-serif;
  font-size: 1.6rem;
  line-height: 1.7;
  color: #e8eaf0;
  background: #0a0714;
  margin: 0;
  padding: 0;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  font-weight: 600;
  line-height: 1.2;
  color: #ffffff;
}
h1 { font-size: 2.4rem; }
h2 { font-size: 2.8rem; margin-bottom: 1rem; }
h3 { font-size: 1.9rem; margin-bottom: 0.8rem; }
h4 { font-size: 1.6rem; margin-bottom: 0.6rem; }

p { margin: 0 0 1.4rem; }

a { color: #7c5aed; text-decoration: none; }
a:hover { color: #a78bfa; text-decoration: underline; }

strong { color: #ffffff; font-weight: 600; }

pre {
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-radius: 6px;
  padding: 1.2rem 1.6rem;
  font-size: 1.4rem;
  overflow-x: auto;
  margin: 1rem 0 1.6rem;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  color: #7c5aed;
}

pre code { color: #e8eaf0; }

.hide { display: none !important; }

/* ============================================
   Layout
   ============================================ */
#container {
  max-width: 1060px;
  margin: 0 auto;
  padding: 4rem 2.4rem 6rem;
}

#content {
  min-height: 60vh;
}

.content-region {
  animation: fadeIn 0.2s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Header
   ============================================ */
#header {
  background: linear-gradient(135deg, #4B0082 0%, #8B008B 100%);
  border-bottom: 1px solid #2d1b4e;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1060px;
  margin: 0 auto;
  padding: 1.6rem 2.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.2rem;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

.logo {
  flex-shrink: 0;
  width: 80px;
  height: 48px;
  object-fit: contain;
  border-radius: 8px;
}

.header-titles h1 {
  font-size: 1.8rem;
  margin: 0;
  color: #ffffff;
  white-space: nowrap;
}

.header-titles .subtitle {
  font-size: 1.2rem;
  color: #8b949e;
  display: block;
  margin-top: 0.2rem;
}

/* ============================================
   Navigation
   ============================================ */
nav { flex-shrink: 0; }

ul.main-menu {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

ul.main-menu li a {
  display: block;
  padding: 0.6rem 1.2rem;
  font-size: 1.4rem;
  font-weight: 500;
  color: #8b949e;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}

ul.main-menu li a:hover {
  color: #e8eaf0;
  background: #1e1135;
  text-decoration: none;
}

ul.main-menu li a.active {
  color: #7c5aed;
  background: rgba(124, 90, 237, 0.1);
}

/* ============================================
   Section Header
   ============================================ */
.section-header {
  margin-bottom: 3.2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid #1e1135;
}

.section-header h2 {
  color: #ffffff;
  font-size: 3rem;
  margin-bottom: 1rem;
}

.lead {
  font-size: 1.75rem;
  color: #8b949e;
  line-height: 1.6;
  max-width: 780px;
  margin-bottom: 0;
}

/* ============================================
   Cards
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-bottom: 3.6rem;
}

.card {
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-radius: 10px;
  padding: 2.4rem;
  transition: border-color 0.2s;
}

.card:hover { border-color: #7c5aed; }

.card-icon {
  font-size: 2.8rem;
  margin-bottom: 1.2rem;
}

.card h3 { font-size: 1.7rem; color: #ffffff; }
.card p  { color: #8b949e; margin-bottom: 0; font-size: 1.5rem; }

/* ============================================
   Timeline
   ============================================ */
.timeline {
  margin-bottom: 3.6rem;
}

.timeline h3 {
  color: #c9d1d9;
  margin-bottom: 1.6rem;
  font-size: 1.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.timeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.6rem;
}

.timeline-item {
  display: flex;
  gap: 1.6rem;
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-radius: 10px;
  padding: 2rem;
  align-items: flex-start;
}

.timeline-badge {
  flex-shrink: 0;
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 1.2rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.timeline-badge.round1 {
  background: rgba(124, 90, 237, 0.15);
  color: #7c5aed;
  border: 1px solid rgba(124, 90, 237, 0.3);
}

.timeline-badge.round2 {
  background: rgba(88, 166, 255, 0.15);
  color: #58a6ff;
  border: 1px solid rgba(88, 166, 255, 0.3);
}

.timeline-content h4 {
  color: #ffffff;
  font-size: 1.5rem;
  margin-bottom: 0.4rem;
}

.timeline-content p {
  color: #8b949e;
  font-size: 1.4rem;
  margin-bottom: 0;
}

/* ============================================
   Optimization Areas
   ============================================ */
.optimization-areas {
  margin-bottom: 3.6rem;
}

.optimization-areas h3 {
  color: #c9d1d9;
  margin-bottom: 1.4rem;
  font-size: 1.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.area-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.area-list li {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  font-size: 1.5rem;
  color: #8b949e;
}

.tag {
  display: inline-block;
  padding: 0.2rem 0.8rem;
  background: #1e1135;
  border: 1px solid #2d1b4e;
  border-radius: 4px;
  font-size: 1.2rem;
  font-weight: 600;
  color: #c9d1d9;
  white-space: nowrap;
}

/* ============================================
   CTA Row
   ============================================ */
.cta-row {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.btn {
  display: inline-block;
  padding: 1rem 2.4rem;
  border-radius: 8px;
  font-size: 1.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: #7c5aed;
  color: #0a0714;
  border: 2px solid #7c5aed;
}

.btn-primary:hover {
  background: #a78bfa;
  border-color: #a78bfa;
  color: #0a0714;
  text-decoration: none;
}

.btn-secondary {
  background: transparent;
  color: #7c5aed;
  border: 2px solid #7c5aed;
}

.btn-secondary:hover {
  background: rgba(124, 90, 237, 0.1);
  text-decoration: none;
}

/* ============================================
   Steps (How to Participate)
   ============================================ */
.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 3.6rem;
  position: relative;
}

.step {
  display: flex;
  gap: 2rem;
  padding: 2rem 2rem 2rem 0;
  position: relative;
}

.step:not(:last-child) {
  border-left: 2px solid #2d1b4e;
  margin-left: 1.9rem;
  padding-left: 2.4rem;
}

.step:last-child {
  border-left: 2px solid transparent;
  margin-left: 1.9rem;
  padding-left: 2.4rem;
}

.step-number {
  position: absolute;
  left: -2rem;
  top: 2rem;
  width: 3.8rem;
  height: 3.8rem;
  border-radius: 50%;
  background: #7c5aed;
  color: #0a0714;
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  z-index: 1;
}

.step-body { flex: 1; }
.step-body h3 { font-size: 1.65rem; color: #ffffff; margin-bottom: 0.4rem; }
.step-body p  { color: #8b949e; font-size: 1.5rem; margin-bottom: 0.6rem; }

/* ============================================
   Resources
   ============================================ */
.resources h3 {
  color: #c9d1d9;
  margin-bottom: 1.4rem;
  font-size: 1.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.4rem;
}

.resource-card {
  display: block;
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-radius: 8px;
  padding: 1.8rem;
  transition: border-color 0.2s;
  text-decoration: none;
}

.resource-card:hover {
  border-color: #7c5aed;
  text-decoration: none;
}

.resource-card strong {
  display: block;
  font-size: 1.5rem;
  color: #7c5aed;
  margin-bottom: 0.4rem;
}

.resource-card span {
  font-size: 1.3rem;
  color: #8b949e;
}

/* ============================================
   Scoring
   ============================================ */
.formula-box {
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-radius: 10px;
  padding: 2.4rem;
  margin-bottom: 3rem;
  text-align: center;
}

.formula-box h3 {
  font-size: 1.4rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #8b949e;
  margin-bottom: 1.4rem;
}

.formula {
  font-size: 1.75rem;
  font-weight: 600;
  color: #7c5aed;
  line-height: 1.5;
  padding: 1.2rem;
  background: rgba(124, 90, 237, 0.05);
  border-radius: 6px;
  border: 1px solid rgba(124, 90, 237, 0.2);
}

.scoring-components {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.6rem;
  margin-bottom: 3rem;
}

.score-card {
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-radius: 10px;
  padding: 2rem;
}

.score-card h4 {
  font-size: 1.5rem;
  color: #ffffff;
  margin-bottom: 0.6rem;
}

.score-card p {
  font-size: 1.4rem;
  color: #8b949e;
  margin-bottom: 0;
}

.score-type {
  display: inline-block;
  padding: 0.2rem 0.8rem;
  border-radius: 4px;
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.8rem;
}

.score-type.pass-fail {
  background: rgba(63, 185, 80, 0.15);
  color: #3fb950;
  border: 1px solid rgba(63, 185, 80, 0.3);
}

.score-type.multiplier {
  background: rgba(124, 90, 237, 0.15);
  color: #7c5aed;
  border: 1px solid rgba(124, 90, 237, 0.3);
}

.score-type.bonus {
  background: rgba(88, 166, 255, 0.15);
  color: #58a6ff;
  border: 1px solid rgba(88, 166, 255, 0.3);
}

.example-box {
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-left: 3px solid #7c5aed;
  border-radius: 10px;
  padding: 2.4rem;
  margin-bottom: 3rem;
}

.example-box h3 {
  font-size: 1.6rem;
  color: #c9d1d9;
  margin-bottom: 0.8rem;
}

.example-box p { font-size: 1.5rem; color: #8b949e; }

.example-calc {
  font-size: 1.7rem;
  color: #e8eaf0;
  background: #0a0714;
  border-radius: 6px;
  padding: 1.2rem 1.6rem;
  margin-top: 1rem;
  font-family: "SFMono-Regular", Consolas, monospace;
}

.example-calc strong { color: #7c5aed; }

.eval-notes {
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-radius: 10px;
  padding: 2.4rem;
}

.eval-notes h3 {
  font-size: 1.6rem;
  color: #c9d1d9;
  margin-bottom: 1.2rem;
}

.eval-notes ul {
  padding-left: 2rem;
  margin: 0;
}

.eval-notes ul li {
  color: #8b949e;
  font-size: 1.5rem;
  margin-bottom: 0.6rem;
}

/* ============================================
   Leaderboard
   ============================================ */
.leaderboard-wrapper {
  background: #130d24;
  border: 1px solid #2d1b4e;
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  justify-content: center;
  padding: 1.2rem;
}

.leaderboard-wrapper iframe {
  display: block;
  width: 100%;
  max-width: 100%;
  border: none;
}

/* ============================================
   Footer
   ============================================ */
footer {
  background: #130d24;
  border-top: 1px solid #1e1135;
  padding: 2rem 2.4rem;
  margin-top: 4rem;
}

.footer-inner {
  max-width: 1060px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 1.35rem;
  color: #8b949e;
}

.footer-inner a { color: #8b949e; }
.footer-inner a:hover { color: #7c5aed; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 700px) {
  #container { padding: 2.4rem 1.6rem 4rem; }

  .header-inner { flex-direction: column; align-items: flex-start; }
  .header-titles h1 { font-size: 1.6rem; white-space: normal; }

  ul.main-menu { gap: 0.2rem; }
  ul.main-menu li a { padding: 0.5rem 0.8rem; font-size: 1.3rem; }

  .section-header h2 { font-size: 2.2rem; }

  .formula { font-size: 1.4rem; }

  .footer-inner { flex-direction: column; align-items: flex-start; }
}