/* ═══════════════════════════════════════════════════
   course.css — Cyber Navigators shared design system
   Light theme, clean modern design
   ═══════════════════════════════════════════════════ */

/* ── DESIGN TOKENS ── */
:root {
  --cn-white:       #FFFFFF;
  --cn-bg:          #f3f4f6;
  --cn-bg-alt:      #e5e7eb;
  --cn-primary:     #0ea5e9;
  --cn-primary-hover: #0284c7;
  --cn-primary-light: #e0f2fe;
  --cn-primary-glow: rgba(14,165,233,0.35);
  --cn-success:     #10B981;
  --cn-success-light: #D1FAE5;
  --cn-warning:     #F59E0B;
  --cn-warning-light: #FEF3C7;
  --cn-danger:      #EF4444;
  --cn-danger-light: #FEE2E2;
  --cn-purple:      #8B5CF6;
  --cn-purple-light: #EDE9FE;
  --cn-text:        #1f2937;
  --cn-text-mid:    #475569;
  --cn-text-soft:   #6b7280;
  --cn-text-muted:  #9ca3af;
  --cn-border:      #e5e7eb;
  --cn-border-light:#f3f4f6;
  --cn-shadow-sm:   0 1px 2px 0 rgba(0,0,0,0.05);
  --cn-shadow:      0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --cn-shadow-md:   0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -6px rgba(0,0,0,0.05);
  --cn-shadow-lg:   0 20px 50px -12px rgba(0,0,0,0.12);
  --cn-shadow-glow: 0 0 20px rgba(14,165,233,0.2);
  --cn-radius:      12px;
  --cn-radius-lg:   16px;
  --cn-radius-xl:   20px;
  --cn-radius-full: 9999px;
  --cn-font:        'Nunito', 'Inter', 'Segoe UI', sans-serif;
  --cn-ease:        0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --cn-ease-spring: 0.34s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── RESET ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--cn-font);
  background: var(--cn-bg);
  color: var(--cn-text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.65;
}
button { font-family: inherit; cursor: pointer; border: none; outline: none; }
button:focus-visible { outline: 2px solid var(--cn-primary); outline-offset: 2px; }
a { text-decoration: none; color: inherit; }

/* ── TOP NAVIGATION ── */
.cn-nav {
  position: sticky; top: 0; z-index: 100;
  height: 85px;
  background: rgba(255,255,255,0.80);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--cn-border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px;
}
.cn-nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 17px; font-weight: 800; color: var(--cn-text);
  letter-spacing: -0.3px;
}
.cn-nav-brand-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--cn-primary);
  box-shadow: 0 0 10px var(--cn-primary-glow);
  flex-shrink: 0;
}
.cn-nav-progress {
  font-size: 13px; font-weight: 700; color: var(--cn-text-soft);
  background: var(--cn-bg-alt); padding: 5px 14px;
  border-radius: var(--cn-radius-full);
}

/* ── BUTTONS ── */
.cn-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: var(--cn-radius);
  font-size: 15px; font-weight: 700; font-family: var(--cn-font);
  transition: all var(--cn-ease); cursor: pointer;
  white-space: nowrap; border: none;
}
.cn-btn:hover { transform: translateY(-1px); }
.cn-btn:active { transform: translateY(0); }

.cn-btn-primary {
  background: var(--cn-primary);
  color: var(--cn-white);
  box-shadow: 0 4px 16px -4px var(--cn-primary-glow);
}
.cn-btn-primary:hover {
  background: var(--cn-primary-hover);
  box-shadow: 0 6px 24px -4px rgba(14,165,233,0.45);
}

.cn-btn-secondary {
  background: var(--cn-white);
  color: var(--cn-text-mid);
  border: 1.5px solid var(--cn-border);
  box-shadow: var(--cn-shadow-sm);
}
.cn-btn-secondary:hover {
  background: var(--cn-bg);
  border-color: var(--cn-text-muted);
  color: var(--cn-text);
}

.cn-btn-ghost {
  background: transparent;
  color: var(--cn-text-soft);
  border: none;
}
.cn-btn-ghost:hover {
  background: var(--cn-bg-alt);
  color: var(--cn-text);
}

/* ── CARDS ── */
.cn-card {
  background: var(--cn-white);
  border: 1px solid var(--cn-border);
  border-radius: var(--cn-radius-lg);
  padding: 24px;
  box-shadow: var(--cn-shadow-sm);
  transition: all var(--cn-ease);
  position: relative; overflow: hidden;
}
.cn-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--cn-primary);
  opacity: 0; transition: opacity var(--cn-ease);
}
.cn-card:hover {
  box-shadow: var(--cn-shadow-md);
  border-color: var(--cn-primary-light);
  transform: translateY(-2px);
}
.cn-card:hover::before { opacity: 1; }

.cn-card--clickable { cursor: pointer; }
.cn-card--locked {
  opacity: 0.55; cursor: not-allowed;
}
.cn-card--locked:hover { transform: none; box-shadow: var(--cn-shadow-sm); }
.cn-card--locked:hover::before { opacity: 0; }

/* ── BADGES ── */
.cn-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 14px; border-radius: var(--cn-radius-full);
  font-size: 11px; font-weight: 800; letter-spacing: 0.06em;
  text-transform: uppercase;
}
.cn-badge--primary { background: var(--cn-primary-light); color: var(--cn-primary); }
.cn-badge--success { background: var(--cn-success-light); color: var(--cn-success); }
.cn-badge--warning { background: var(--cn-warning-light); color: var(--cn-warning); }
.cn-badge--danger  { background: var(--cn-danger-light); color: var(--cn-danger); }
.cn-badge--purple  { background: var(--cn-purple-light); color: var(--cn-purple); }

/* ── PROGRESS STEPPER ── */
.cn-stepper {
  width: 100%; max-width: 700px;
  padding: 18px 16px 10px;
  display: flex; justify-content: center; gap: 0;
}
.cn-stepper-item {
  display: flex; flex-direction: column; align-items: center;
  flex: 1; position: relative; max-width: 86px;
}
.cn-stepper-dot {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 800;
  border: 2px solid var(--cn-border);
  background: var(--cn-white);
  color: var(--cn-text-muted);
  transition: all 0.3s ease;
  position: relative; z-index: 1;
}
.cn-stepper-dot.done {
  background: var(--cn-success); border-color: var(--cn-success);
  color: var(--cn-white);
}
.cn-stepper-dot.active {
  background: var(--cn-primary); border-color: #38bdf8;
  color: var(--cn-white);
  box-shadow: 0 0 12px var(--cn-primary-glow);
}
.cn-stepper-label {
  font-size: 9px; margin-top: 5px; letter-spacing: 0.3px;
  color: var(--cn-text-muted); font-weight: 600;
  text-align: center;
}
.cn-stepper-label.active { color: var(--cn-primary); font-weight: 800; }
.cn-stepper-label.done   { color: var(--cn-success); }
.cn-stepper-line {
  position: absolute; top: 16px; left: 50%;
  width: 100%; height: 2px; z-index: 0;
  background: var(--cn-border); transition: background 0.3s ease;
}
.cn-stepper-line.done { background: var(--cn-success); }

/* ── SECTION HEADERS ── */
.cn-section {
  max-width: 700px; width: 92%;
  padding: 20px 0 10px;
  display: flex; flex-direction: column; gap: 6px;
}
.cn-section-label {
  font-size: 12px; font-weight: 700; letter-spacing: 0.04em;
}
.cn-section-title {
  font-size: 26px; font-weight: 800; color: var(--cn-text);
  line-height: 1.25; letter-spacing: -0.01em;
}
.cn-section-sub {
  font-size: 15px; color: var(--cn-text-soft); line-height: 1.65;
}

/* ── ICON PILL (replaces emoji icons) ── */
.cn-icon-pill {
  width: 44px; height: 44px; border-radius: var(--cn-radius);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.cn-icon-pill svg {
  width: 20px; height: 20px;
  stroke-width: 2; fill: none;
  stroke-linecap: round; stroke-linejoin: round;
}

/* ── STEP PANELS ── */
.cn-step { display: none; }
.cn-step.active {
  display: flex; flex-direction: column; align-items: center;
  min-height: 100vh;
}

/* ── ANIMATIONS ── */
@keyframes cn-fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.cn-anim-fade-up { animation: cn-fade-up 0.45s ease forwards; }
.cn-anim-fade-up-d1 { animation: cn-fade-up 0.45s 0.08s ease forwards; }
.cn-anim-fade-up-d2 { animation: cn-fade-up 0.45s 0.16s ease forwards; }
.cn-anim-fade-up-d3 { animation: cn-fade-up 0.45s 0.24s ease forwards; }

@keyframes cn-scale-in {
  from { opacity: 0; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1); }
}
.cn-anim-scale-in { animation: cn-scale-in 0.3s var(--cn-ease-spring) forwards; }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .cn-nav { padding: 0 16px; }
  .cn-nav-brand { font-size: 15px; }
  .cn-nav-progress { font-size: 12px; padding: 4px 10px; }
  .cn-section-title { font-size: 22px; }
  .cn-btn { padding: 11px 22px; font-size: 14px; }
  .cn-card { padding: 18px; }
}