@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Inter:wght@400;500;600;700&display=swap');

/* ===== RESET & BASE ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --green: #4CAF50;
  --green-dark: #388E3C;
  --green-glow: rgba(76, 175, 80, 0.15);
  --dark: #1a1a2e;
  --darker: #0f0f1a;
  --darkest: #0a0a14;
  --surface: rgba(255,255,255,0.03);
  --surface-hover: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(76, 175, 80, 0.4);
  --diamond: #4AEDD9;
  --gold: #FFD700;
  --red: #FF5252;
  --red-soft: rgba(255, 82, 82, 0.15);
  --green-soft: rgba(76, 175, 80, 0.15);
  --text: #e0e0e0;
  --text-dim: #888;
  --text-dimmer: #555;
  --xp-blue: #4AEDD9;
  --font-mono: 'JetBrains Mono', monospace;
  --font-text: 'Inter', sans-serif;
  --radius: 8px;
  --radius-lg: 12px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--darker);
  color: var(--text);
  font-family: var(--font-text);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--diamond); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== GRID BG ===== */
.bg-grid {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(76,175,80,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(76,175,80,0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none; z-index: 0;
}

/* ===== HEADER / XP BAR ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15,15,26,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.6rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
}

.header-logo {
  font-family: var(--font-mono);
  font-weight: 700; font-size: 1.2rem;
  white-space: nowrap;
}
.header-logo .mine { color: var(--green); }
.header-logo .code { color: var(--diamond); }
.header-logo .dot { color: var(--gold); }

.header-stats {
  display: flex; align-items: center; gap: 1rem;
  font-family: var(--font-mono); font-size: 0.8rem;
}

.xp-display {
  display: flex; align-items: center; gap: 0.5rem;
}

.xp-bar-container {
  width: 120px; height: 8px;
  background: rgba(255,255,255,0.08);
  border-radius: 4px; overflow: hidden;
}

.xp-bar-fill {
  height: 100%; background: linear-gradient(90deg, var(--green), var(--diamond));
  border-radius: 4px; transition: width 0.5s ease;
}

.xp-text { color: var(--diamond); }
.level-badge {
  padding: 0.2rem 0.6rem;
  background: var(--green-glow);
  border: 1px solid rgba(76,175,80,0.3);
  border-radius: 100px;
  color: var(--green); font-size: 0.75rem;
}

.streak-display { color: var(--gold); }

/* ===== MAIN CONTENT ===== */
.page-content {
  position: relative; z-index: 1;
  max-width: 800px; margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ===== LESSON STYLES ===== */
.lesson-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.lesson-breadcrumb {
  font-size: 0.85rem; color: var(--text-dim);
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.lesson-title {
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: 700; line-height: 1.2;
  margin-bottom: 0.5rem;
}

.lesson-subtitle {
  font-size: 1.05rem; color: var(--text-dim);
  font-style: italic;
}

.lesson-section {
  margin-bottom: 2.5rem;
}

.section-icon {
  font-size: 1.5rem; margin-right: 0.5rem;
}

h2 {
  font-size: 1.4rem; font-weight: 700;
  margin-bottom: 1rem;
  color: var(--green);
  display: flex; align-items: center; gap: 0.4rem;
}

h3 {
  font-size: 1.1rem; font-weight: 600;
  margin: 1.5rem 0 0.75rem;
  color: var(--text);
}

p { margin-bottom: 1rem; }

ul, ol {
  margin: 0.5rem 0 1rem 1.5rem;
}
li { margin-bottom: 0.4rem; }

strong { color: #fff; }

blockquote {
  border-left: 3px solid var(--green);
  padding: 0.8rem 1rem;
  margin: 1rem 0;
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-dim);
  font-style: italic;
}

/* ===== CODE BLOCKS ===== */
pre {
  background: var(--darkest);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin: 1rem 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  position: relative;
}

pre code {
  background: none; padding: 0; border: none; font-size: inherit;
}

code {
  font-family: var(--font-mono);
  background: rgba(76,175,80,0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--green);
}

/* Syntax highlighting (manual lightweight) */
.kw { color: #c792ea; }  /* keywords */
.fn { color: #82aaff; }  /* functions */
.st { color: #c3e88d; }  /* strings */
.cm { color: #546e7a; }  /* comments */
.nb { color: #f78c6c; }  /* numbers */
.op { color: #89ddff; }  /* operators */

/* ===== TABLES ===== */
table {
  width: 100%; border-collapse: collapse;
  margin: 1rem 0; font-size: 0.9rem;
}
th, td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
}
th {
  background: var(--surface);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* ===== SPOILER / DETAILS ===== */
details {
  margin: 1rem 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

details summary {
  padding: 0.8rem 1rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--diamond);
  transition: background 0.2s;
  user-select: none;
  list-style: none;
}

details summary::before {
  content: '▶ '; font-size: 0.7em;
  transition: transform 0.2s;
  display: inline-block;
}

details[open] summary::before {
  transform: rotate(90deg);
}

details summary:hover {
  background: var(--surface-hover);
}

details > div, details > p, details > pre {
  padding: 0 1rem 1rem;
}

/* ===== QUIZ COMPONENT ===== */
.quiz-block {
  background: linear-gradient(135deg, rgba(76,175,80,0.05), rgba(74,237,217,0.05));
  border: 1px solid rgba(76,175,80,0.2);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.quiz-header {
  display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono); font-size: 0.85rem;
  color: var(--green);
}

.quiz-xp {
  margin-left: auto;
  color: var(--gold); font-size: 0.8rem;
}

.quiz-question {
  font-size: 1.05rem; font-weight: 600;
  margin-bottom: 1rem; line-height: 1.5;
}

.quiz-question pre {
  margin-top: 0.8rem;
}

.quiz-options {
  display: flex; flex-direction: column; gap: 0.5rem;
}

.quiz-option {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.8rem 1rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.95rem;
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--green);
  background: var(--green-glow);
}

.quiz-option.correct {
  border-color: var(--green);
  background: var(--green-soft);
}

.quiz-option.wrong {
  border-color: var(--red);
  background: var(--red-soft);
}

.quiz-option.disabled { cursor: default; opacity: 0.6; }

.quiz-option-letter {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--font-mono); font-size: 0.8rem; font-weight: 700;
  flex-shrink: 0;
}

.quiz-feedback {
  margin-top: 1rem; padding: 0.8rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem; display: none;
}

.quiz-feedback.show { display: block; }

.quiz-feedback.correct {
  background: var(--green-soft);
  border: 1px solid rgba(76,175,80,0.3);
  color: var(--green);
}

.quiz-feedback.wrong {
  background: var(--red-soft);
  border: 1px solid rgba(255,82,82,0.3);
  color: var(--red);
}

.quiz-retry {
  display: none; margin-top: 0.8rem;
  padding: 0.5rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text); cursor: pointer;
  font-family: var(--font-mono); font-size: 0.8rem;
}

.quiz-retry:hover { border-color: var(--diamond); }
.quiz-retry.show { display: inline-block; }

/* Fill-in quiz */
.quiz-fill-input {
  background: var(--darkest);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.4rem 0.8rem;
  color: var(--diamond);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  width: 150px;
}

.quiz-fill-input:focus {
  outline: none;
  border-color: var(--green);
}

.quiz-submit-btn {
  margin-top: 0.8rem;
  padding: 0.5rem 1.5rem;
  background: var(--green);
  border: none; border-radius: var(--radius);
  color: #fff; font-family: var(--font-mono);
  font-size: 0.85rem; cursor: pointer;
  transition: background 0.2s;
}

.quiz-submit-btn:hover { background: var(--green-dark); }

/* ===== BOSS CHALLENGE ===== */
.boss-block {
  background: linear-gradient(135deg, rgba(255,215,0,0.05), rgba(255,82,82,0.05));
  border: 2px solid rgba(255,215,0,0.3);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 2rem 0;
}

.boss-header {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 1rem;
  color: var(--gold); margin-bottom: 1rem;
  font-weight: 700;
}

.boss-xp { margin-left: auto; font-size: 0.85rem; }

/* ===== LESSON NAV ===== */
.lesson-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 3rem; padding-top: 2rem;
  border-top: 1px solid var(--border);
  gap: 1rem; flex-wrap: wrap;
}

.lesson-nav a {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono); font-size: 0.85rem;
  transition: all 0.2s;
}

.lesson-nav a:hover {
  border-color: var(--green);
  text-decoration: none;
  transform: translateY(-2px);
}

/* ===== COURSE MAP ===== */
.module-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: all 0.3s;
}

.module-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.module-card.locked {
  opacity: 0.5;
  pointer-events: none;
}

.module-header {
  display: flex; align-items: flex-start; gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.module-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: var(--green-glow);
  border-radius: 100px;
  color: var(--green);
}

.module-title {
  font-size: 1.2rem; font-weight: 700;
}

.module-progress-bar {
  width: 100%; height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px; overflow: hidden;
  margin: 0.8rem 0;
}

.module-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--diamond));
  border-radius: 3px; transition: width 0.5s;
}

.module-lessons {
  list-style: none; padding: 0;
}

.module-lessons li {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  font-size: 0.9rem;
  flex-wrap: nowrap;
}

.lesson-time {
  color: var(--text-dimmer);
  font-size: 0.8rem;
  margin-left: auto;
  white-space: nowrap;
  flex-shrink: 0;
}

.module-lessons li:last-child { border-bottom: none; }

.lesson-status-icon { font-size: 1rem; }

.module-lessons a {
  color: var(--text);
}

.module-lessons a:hover { color: var(--green); }

.module-lessons .locked-lesson { color: var(--text-dimmer); }

/* ===== LANDING PAGE SPECIFIC ===== */
.hero {
  text-align: center;
  padding: 4rem 0 3rem;
}

.hero-logo {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700; margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: clamp(1rem, 3vw, 1.3rem);
  color: var(--text-dim);
  margin-bottom: 2rem; line-height: 1.7;
}

.cta-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.9rem 2rem;
  background: var(--green);
  color: #fff; border: none; border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 1.05rem; font-weight: 700;
  cursor: pointer; transition: all 0.2s;
  text-decoration: none;
}

.cta-btn:hover {
  background: var(--green-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(76,175,80,0.2);
  text-decoration: none;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.2rem; margin: 2rem 0;
}

.feature-card {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all 0.3s;
}

.feature-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.feature-icon { font-size: 2.2rem; margin-bottom: 0.75rem; display: block; }
.feature-title { font-weight: 700; margin-bottom: 0.3rem; font-size: 1rem; }
.feature-desc { font-size: 0.85rem; color: var(--text-dim); }

.landing-modules {
  margin: 3rem 0;
}

.landing-modules h2 {
  text-align: center; justify-content: center;
  font-size: 1.6rem; margin-bottom: 1.5rem;
}

.xp-preview {
  text-align: center;
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin: 2rem 0;
}

.xp-preview h3 { color: var(--gold); margin-bottom: 1rem; }

.level-progression {
  display: flex; align-items: center; justify-content: center;
  gap: 0.5rem; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 0.8rem;
  color: var(--text-dim);
}

.level-item { padding: 0.3rem 0.6rem; border-radius: 4px; }
.level-item.active { background: var(--green-glow); color: var(--green); }
.level-arrow { color: var(--text-dimmer); }

/* ===== ACHIEVEMENT POPUP ===== */
.achievement-popup {
  position: fixed; top: 80px; right: 20px;
  background: linear-gradient(135deg, rgba(15,15,26,0.98), rgba(30,30,50,0.98));
  border: 1px solid var(--gold);
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
  z-index: 1000;
  transform: translateX(400px);
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 8px 32px rgba(255,215,0,0.15);
  max-width: 300px;
}

.achievement-popup.show {
  transform: translateX(0);
}

.achievement-popup .ach-title {
  font-family: var(--font-mono); font-size: 0.75rem;
  color: var(--gold); margin-bottom: 0.3rem;
  text-transform: uppercase; letter-spacing: 0.05em;
}

.achievement-popup .ach-name {
  font-weight: 700; font-size: 1rem;
}

.achievement-popup .ach-desc {
  font-size: 0.8rem; color: var(--text-dim); margin-top: 0.2rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  .site-header { padding: 0.5rem 1rem; flex-wrap: wrap; }
  .xp-bar-container { width: 80px; }
  .page-content { padding: 1.2rem 1rem 3rem; }
  .lesson-nav { flex-direction: column; }
  .lesson-nav a { width: 100%; justify-content: center; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .level-progression { font-size: 0.7rem; }
  .quiz-block, .boss-block { padding: 1rem; }
  table { font-size: 0.8rem; }
  th, td { padding: 0.4rem; }
}

/* ===== PIXEL PARTICLES ===== */
.pixel-particles {
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
}

.pixel {
  position: absolute; width: 4px; height: 4px;
  opacity: 0; animation: float-up 8s infinite;
}

@keyframes float-up {
  0% { transform: translateY(100vh); opacity: 0; }
  10% { opacity: 0.3; }
  90% { opacity: 0.1; }
  100% { transform: translateY(-20px); opacity: 0; }
}

/* ===== REFLECTION BOX ===== */
.reflection-box {
  background: linear-gradient(135deg, rgba(74,237,217,0.05), rgba(76,175,80,0.05));
  border: 1px solid rgba(74,237,217,0.2);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.reflection-box h2 { color: var(--diamond); }

.reflection-box ul {
  list-style: none; padding: 0; margin: 0.5rem 0;
}

.reflection-box li {
  padding: 0.3rem 0;
}

/* ===== CODE INPUT ===== */
.code-input-block {
  margin: 1rem 0;
}

.code-textarea {
  width: 100%;
  min-height: 120px;
  background: var(--darkest);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  resize: vertical;
  -webkit-appearance: none;
}

.code-textarea:focus {
  outline: none;
  border-color: var(--green);
}

.code-textarea::placeholder {
  color: var(--text-dimmer);
}

.code-run-btn {
  margin-top: 0.5rem;
  padding: 0.5rem 1.5rem;
  background: var(--green);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s;
}

.code-run-btn:hover {
  background: var(--green-dark);
}

/* ===== FOOTER ===== */
.site-footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-dimmer);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
}

/* ===== IMAGES ===== */
.hero-image {
  width: 100%;
  max-width: 700px;
  margin: 1.5rem auto 2rem;
  display: block;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.lesson-hero-image {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}

/* ===== CODE FEEDBACK ===== */
.code-feedback {
  margin-top: 0.5rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  display: none;
}
.code-feedback.show { display: block; }
.code-feedback.correct {
  background: var(--green-soft);
  border: 1px solid rgba(76,175,80,0.3);
  color: var(--green);
}
.code-feedback.wrong {
  background: var(--red-soft);
  border: 1px solid rgba(255,82,82,0.3);
  color: var(--red);
}
.code-feedback.warning {
  background: rgba(255,215,0,0.1);
  border: 1px solid rgba(255,215,0,0.3);
  color: var(--gold);
}


/* Multi-level hint progression */
.hint-level-1 summary { color: var(--diamond); }
.hint-level-2 summary { color: var(--gold); }
.hint-level-3 summary { color: var(--green); font-weight: 600; }