/* ============================================
   MAVTECH ACADEMY - Learning App Stylesheet
   First-principles interactive education
   Self-contained: shares tokens with the main
   site but does not depend on ../css/styles.css
   ============================================ */

:root {
  --navy-900: #0a1628;
  --navy-800: #0f1f3d;
  --navy-700: #142952;
  --navy-600: #1a3468;
  --blue-accent: #00b4d8;
  --blue-light: #48cae4;
  --blue-deep: #0077b6;
  --blue-glow: rgba(0, 180, 216, 0.3);
  --cyan-100: rgba(0, 180, 216, 0.08);
  --cyan-200: rgba(0, 180, 216, 0.15);
  --cyan-300: rgba(0, 180, 216, 0.25);
  --silver-100: #f0f2f5;
  --silver-200: #d4d8df;
  --silver-300: #a8aeb8;
  --silver-400: #7c8490;
  --white: #ffffff;
  --dark: #060d1a;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --glass-bg: rgba(15, 31, 61, 0.45);
  --glass-border: rgba(255, 255, 255, 0.07);
  --glass-border-hover: rgba(0, 180, 216, 0.25);
  --glass-blur: blur(20px);
  --font-heading: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1100px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 30px var(--blue-glow);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--navy-900);
  color: var(--silver-200);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

img, canvas, svg { max-width: 100%; display: block; }

a { color: var(--blue-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--blue-accent); }

h1, h2, h3, h4 { font-family: var(--font-heading); color: var(--white); line-height: 1.25; }

code { font-family: var(--font-mono); background: var(--cyan-100); padding: 0.1em 0.35em; border-radius: 4px; color: var(--blue-light); font-size: 0.92em; }

/* ---------- Academy header ---------- */
.academy-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
}
.academy-header-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0.85rem 1.5rem;
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.academy-logo { font-weight: 800; font-size: 1.15rem; color: var(--white); letter-spacing: 0.02em; display: flex; align-items: center; gap: 0.5rem; }
.academy-logo .spark { color: var(--blue-accent); }
.academy-nav { display: flex; gap: 0.35rem; margin-left: auto; flex-wrap: wrap; }
.academy-nav a {
  padding: 0.45rem 0.9rem; border-radius: 999px; font-size: 0.9rem; font-weight: 600;
  color: var(--silver-300); border: 1px solid transparent;
}
.academy-nav a:hover { color: var(--white); background: var(--cyan-100); }
.academy-nav a.active { color: var(--blue-light); background: var(--cyan-100); border-color: var(--glass-border-hover); }
.academy-nav a.back-to-site { color: var(--silver-400); font-weight: 500; }

/* ---------- Layout ---------- */
.academy-main { max-width: var(--max-width); margin: 0 auto; padding: 2.5rem 1.5rem 5rem; }

.module-hero { padding: 3rem 0 2rem; text-align: left; }
.module-hero .eyebrow {
  display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--blue-accent);
  background: var(--cyan-100); border: 1px solid var(--glass-border-hover);
  padding: 0.3rem 0.8rem; border-radius: 999px; margin-bottom: 1rem;
}
.module-hero h1 { font-size: clamp(1.9rem, 4.5vw, 3rem); margin-bottom: 0.8rem; }
.module-hero .lede { font-size: 1.12rem; color: var(--silver-300); max-width: 46rem; }

/* ---------- Cards / glass ---------- */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1.75rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.glass-card:hover { border-color: var(--glass-border-hover); }

/* ---------- Lessons ---------- */
.lesson { margin: 3rem 0; scroll-margin-top: 90px; }
.lesson-header { display: flex; align-items: baseline; gap: 0.85rem; margin-bottom: 1rem; }
.lesson-number {
  font-family: var(--font-mono); font-size: 0.85rem; font-weight: 700; color: var(--blue-accent);
  border: 1px solid var(--glass-border-hover); border-radius: 8px; padding: 0.2rem 0.55rem;
  white-space: nowrap;
}
.lesson h2 { font-size: 1.55rem; }
.lesson h3 { font-size: 1.15rem; margin: 1.5rem 0 0.6rem; color: var(--blue-light); }
.lesson p { margin: 0.85rem 0; max-width: 48rem; }
.lesson ul, .lesson ol { margin: 0.85rem 0 0.85rem 1.4rem; max-width: 46rem; }
.lesson li { margin: 0.4rem 0; }
.lesson .done-badge { display: none; color: var(--success); font-size: 1.1rem; }
.lesson.is-complete .done-badge { display: inline; }

.first-principle {
  border-left: 3px solid var(--blue-accent);
  background: var(--cyan-100);
  border-radius: 0 12px 12px 0;
  padding: 1rem 1.25rem;
  margin: 1.4rem 0;
  max-width: 48rem;
}
.first-principle .fp-label {
  font-size: 0.72rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--blue-accent); display: block; margin-bottom: 0.35rem;
}
.first-principle p { margin: 0.3rem 0; color: var(--silver-100); }

/* ---------- Simulations ---------- */
.sim-panel { margin: 1.6rem 0; padding: 0; overflow: hidden; }
.sim-panel .sim-title {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1rem 1.4rem; border-bottom: 1px solid var(--glass-border);
  font-weight: 700; color: var(--white); font-size: 0.98rem;
}
.sim-panel .sim-title .sim-tag { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--blue-accent); }
.sim-stage { position: relative; background: var(--dark); }
.sim-stage canvas { width: 100%; height: auto; display: block; }
.sim-controls {
  display: flex; flex-wrap: wrap; gap: 1rem 1.6rem; align-items: center;
  padding: 1.1rem 1.4rem; border-top: 1px solid var(--glass-border);
}
.sim-control { display: flex; flex-direction: column; gap: 0.3rem; min-width: 150px; flex: 1 1 150px; max-width: 240px; }
.sim-control label { font-size: 0.78rem; font-weight: 600; color: var(--silver-300); letter-spacing: 0.03em; }
.sim-control output, .sim-readout strong { font-family: var(--font-mono); color: var(--blue-light); font-size: 0.85rem; }
.sim-readout { font-size: 0.82rem; color: var(--silver-300); }

input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 4px;
  background: var(--navy-600); border-radius: 999px; outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 16px; height: 16px; border-radius: 50%;
  background: var(--blue-accent); border: 2px solid var(--white);
  box-shadow: 0 0 10px var(--blue-glow); cursor: grab;
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--blue-accent); border: 2px solid var(--white); cursor: grab;
}

select {
  background: var(--navy-800); color: var(--silver-100); border: 1px solid var(--glass-border);
  border-radius: 8px; padding: 0.45rem 0.6rem; font-family: var(--font-body); font-size: 0.88rem;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.45rem;
  font-family: var(--font-heading); font-weight: 700; font-size: 0.9rem;
  padding: 0.6rem 1.3rem; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--glass-border-hover);
  background: linear-gradient(135deg, var(--blue-deep), var(--blue-accent));
  color: var(--white); transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow); }
.btn:active { transform: translateY(0); }
.btn.btn-ghost { background: transparent; color: var(--blue-light); }
.btn.btn-ghost:hover { background: var(--cyan-100); box-shadow: none; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }

/* ---------- Quizzes ---------- */
.quiz { margin: 1.8rem 0; max-width: 48rem; }
.quiz .quiz-label {
  font-size: 0.72rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--warning); display: block; margin-bottom: 0.6rem;
}
.quiz .quiz-question { font-weight: 700; color: var(--white); margin-bottom: 1rem; font-size: 1.02rem; }
.quiz .quiz-options { display: grid; gap: 0.6rem; }
.quiz .quiz-option {
  text-align: left; padding: 0.75rem 1rem; border-radius: 10px; cursor: pointer;
  background: var(--navy-800); border: 1px solid var(--glass-border);
  color: var(--silver-200); font-family: var(--font-body); font-size: 0.95rem;
  transition: border-color var(--transition), background var(--transition);
}
.quiz .quiz-option:hover:not(:disabled) { border-color: var(--glass-border-hover); background: var(--navy-700); }
.quiz .quiz-option.correct { border-color: var(--success); background: rgba(16, 185, 129, 0.12); color: var(--white); }
.quiz .quiz-option.incorrect { border-color: var(--error); background: rgba(239, 68, 68, 0.1); }
.quiz .quiz-option:disabled { cursor: default; }
.quiz .quiz-explain {
  display: none; margin-top: 0.9rem; padding: 0.9rem 1.1rem; border-radius: 10px;
  background: var(--cyan-100); border: 1px solid var(--glass-border-hover);
  font-size: 0.92rem; color: var(--silver-100);
}
.quiz .quiz-explain.visible { display: block; }
.quiz .quiz-explain .why { font-weight: 700; color: var(--blue-light); }

/* ---------- Progress ---------- */
.progress-wrap { display: flex; align-items: center; gap: 0.8rem; margin: 0.6rem 0 0; }
.progress-track { flex: 1; height: 8px; background: var(--navy-700); border-radius: 999px; overflow: hidden; }
.progress-fill {
  height: 100%; width: 0%; border-radius: 999px;
  background: linear-gradient(90deg, var(--blue-deep), var(--blue-accent), var(--blue-light));
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.progress-pct { font-family: var(--font-mono); font-size: 0.82rem; color: var(--blue-light); min-width: 3.2em; text-align: right; }

/* ---------- Hub module cards ---------- */
.module-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
.module-card { display: flex; flex-direction: column; gap: 0.75rem; }
.module-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.module-card .module-icon { font-size: 2rem; line-height: 1; }
.module-card h3 { font-size: 1.25rem; }
.module-card p { color: var(--silver-300); font-size: 0.94rem; flex: 1; }
.module-card .module-cta { font-weight: 700; color: var(--blue-accent); font-size: 0.9rem; }

/* ---------- Path / pedagogy strip ---------- */
.path-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin: 2.2rem 0; }
.path-step { padding: 1.1rem 1.2rem; }
.path-step .step-num { font-family: var(--font-mono); color: var(--blue-accent); font-weight: 700; font-size: 0.8rem; }
.path-step h4 { margin: 0.3rem 0 0.35rem; font-size: 0.98rem; }
.path-step p { font-size: 0.85rem; color: var(--silver-300); }

/* ---------- Reveal animations ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Footer ---------- */
.academy-footer {
  border-top: 1px solid var(--glass-border); padding: 2rem 1.5rem; text-align: center;
  color: var(--silver-400); font-size: 0.85rem;
}
.academy-footer a { color: var(--silver-300); }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .academy-header-inner { padding: 0.6rem 1rem; }
  /* Single-row scrollable nav so the sticky header stays short on phones */
  .academy-nav {
    margin-left: 0; width: 100%; flex-wrap: nowrap; overflow-x: auto;
    scrollbar-width: none; -webkit-overflow-scrolling: touch;
  }
  .academy-nav::-webkit-scrollbar { display: none; }
  .academy-nav a { white-space: nowrap; flex: 0 0 auto; }
  .academy-main { padding: 1.5rem 1rem 4rem; }
  .lesson h2 { font-size: 1.3rem; }
  .sim-controls { padding: 1rem; gap: 0.8rem 1.2rem; }
  .sim-control { min-width: 120px; }
}