/* ==========================================================================
   KETCHUP & COPPER DISCOVERY 2.0 — Y'all Too Branded Activity Scroll
   --------------------------------------------------------------------------
   Six-stage interactive experience with achievements, scroll progress,
   and localStorage persistence. Bright, playful, mobile-first.
   ========================================================================== */

:root {
  color-scheme: light;

  /* ---- Y'all Too brand ---- */
  --kc-cyan:          #2fd2ff;
  --kc-cyan-dark:     #1ab8e3;
  --kc-cyan-wash:     rgba(47, 210, 255, 0.12);
  --kc-blue:          #3d3dea;
  --kc-blue-dark:     #2e2eb8;
  --kc-blue-wash:     rgba(61, 61, 234, 0.10);
  --kc-pink:          #f310ba;
  --kc-pink-dark:     #c40d95;
  --kc-pink-light:    #ff9df2;
  --kc-pink-wash:     rgba(243, 16, 186, 0.10);
  --kc-dark:          #06070d;

  /* ---- Ketchup + copper ---- */
  --kc-ketchup:       #d93025;
  --kc-ketchup-dark:  #a82820;
  --kc-ketchup-wash:  rgba(217, 48, 37, 0.10);
  --kc-copper:        #b87333;
  --kc-copper-dark:   #8c5a2a;
  --kc-copper-light:  #f5e6d3;
  --kc-copper-wash:   rgba(184, 115, 51, 0.10);
  --kc-copper-grad:   linear-gradient(135deg, #d4a06a, #b87333 40%, #8c5a2a 70%, #d4a06a);

  /* ---- Neutrals ---- */
  --kc-bg:            #f5fbff;
  --kc-surface:       #ffffff;
  --kc-surface-2:     #f0f4f8;
  --kc-surface-3:     #e2e8f0;
  --kc-text:          #10233f;
  --kc-text-strong:   #0a1628;
  --kc-body:          #374151;
  --kc-muted:         #64748b;
  --kc-line:          #e2e8f0;
  --kc-line-strong:   #cbd5e1;

  /* ---- Success / error ---- */
  --kc-green:         #16a34a;
  --kc-green-wash:    rgba(22, 163, 74, 0.08);
  --kc-green-dark:    #15803d;

  /* ---- Elevation ---- */
  --kc-shadow:        0 8px 24px rgba(6, 7, 13, 0.08);
  --kc-shadow-soft:   0 3px 10px rgba(6, 7, 13, 0.05);
  --kc-shadow-lift:   0 14px 40px rgba(6, 7, 13, 0.12);

  /* ---- Shape ---- */
  --kc-radius-sm:  10px;
  --kc-radius-md:  16px;
  --kc-radius-lg:  24px;
  --kc-radius-xl:  32px;

  /* ---- Type ---- */
  --kc-font: 'Plus Jakarta Sans', Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
}

/* ==========================================================================
   RESETS
   ========================================================================== */
.kc-page, .kc-page *, .kc-page *::before, .kc-page *::after { box-sizing: border-box; }

.kc-page {
  margin: 0;
  min-height: 100dvh;
  background: var(--kc-bg);
  color: var(--kc-text);
  font-family: var(--kc-font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

img { max-width: 100%; height: auto; }

.kc-container {
  width: min(100%, 800px);
  margin-inline: auto;
  padding-inline: 16px;
}

/* ==========================================================================
   SCROLL PROGRESS BAR
   ========================================================================== */
.kc-scroll-bar {
  height: 3px;
  background: var(--kc-surface-3);
  overflow: hidden;
}
.kc-scroll-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--kc-cyan), var(--kc-blue), var(--kc-pink));
  transition: width 80ms linear;
}
.kc-scroll-bar-fill.champion {
  background: linear-gradient(90deg, var(--kc-cyan), var(--kc-blue), var(--kc-pink), var(--kc-cyan));
  background-size: 200% 100%;
  animation: kc-champion-bar 2s linear infinite;
}
@keyframes kc-champion-bar {
  to { background-position: -200% 0; }
}

/* ==========================================================================
   STICKY TOPBAR
   ========================================================================== */
.kc-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--kc-line);
}
.kc-topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 800px;
  margin-inline: auto;
  padding: 10px 16px;
  gap: 12px;
}
.kc-topbar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--kc-text);
}
.kc-topbar-logo {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: contain;
}
.kc-topbar-title {
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--kc-text-strong);
}
.kc-topbar-nav {
  display: flex;
  gap: 4px;
}
.kc-nav-link {
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--kc-muted);
  transition: color 120ms, background 120ms;
}
.kc-nav-link:hover {
  color: var(--kc-blue);
  background: var(--kc-blue-wash);
}

/* ==========================================================================
   ACHIEVEMENT TOAST
   ========================================================================== */
.kc-toast {
  position: fixed;
  top: 70px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease, transform 300ms ease;
}
.kc-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.kc-toast-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-radius: var(--kc-radius-md);
  background: var(--kc-dark);
  color: #fff;
  box-shadow: 0 12px 40px rgba(6, 7, 13, 0.3);
  white-space: nowrap;
}
.kc-toast-icon { font-size: 24px; flex-shrink: 0; }
.kc-toast-text { display: flex; flex-direction: column; gap: 1px; }
.kc-toast-text strong { font-size: 14px; font-weight: 800; }
.kc-toast-text span { font-size: 12px; color: rgba(255,255,255,0.7); }

/* ==========================================================================
   HERO — STAGE 1
   ========================================================================== */
.kc-hero {
  position: relative;
  overflow: hidden;
  padding: 60px 0 48px;
  background:
    radial-gradient(ellipse at 75% 15%, rgba(47, 210, 255, 0.18), transparent 50%),
    radial-gradient(ellipse at 25% 85%, rgba(243, 16, 186, 0.12), transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(184, 115, 51, 0.06), transparent 40%),
    var(--kc-dark);
  color: #fff;
}
.kc-hero-content { position: relative; z-index: 2; }

/* Decorative coins */
.kc-hero-decor { position: absolute; inset: 0; z-index: 1; pointer-events: none; overflow: hidden; }
.kc-coin {
  position: absolute;
  border-radius: 50%;
  background: var(--kc-copper-grad);
  opacity: 0.15;
}
.kc-coin-1 { width: 120px; height: 120px; top: 10%; right: -20px; }
.kc-coin-2 { width: 80px; height: 80px; bottom: 15%; left: -10px; }
.kc-coin-3 { width: 50px; height: 50px; top: 40%; right: 15%; }

/* Decorative drips */
.kc-drip {
  position: absolute;
  width: 6px;
  border-radius: 0 0 3px 3px;
  background: rgba(217, 48, 37, 0.2);
}
.kc-drip-1 { height: 40px; top: 0; left: 20%; }
.kc-drip-2 { height: 28px; top: 0; right: 30%; }

.kc-hero-logo {
  width: 72px;
  height: 72px;
  border-radius: 16px;
  margin-bottom: 16px;
  object-fit: contain;
}
.kc-hero-kicker {
  display: inline-block;
  padding: 6px 16px;
  margin-bottom: 20px;
  border-radius: 999px;
  background: rgba(47, 210, 255, 0.15);
  border: 1px solid rgba(47, 210, 255, 0.3);
  color: var(--kc-cyan);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.kc-hero h1 {
  margin: 0 0 20px;
  font-weight: 900;
  line-height: 1.0;
  letter-spacing: -0.02em;
}
.kc-hero-line1 {
  display: block;
  font-size: clamp(32px, 8vw, 56px);
  color: #fff;
}
.kc-hero-line2 {
  display: block;
  font-size: clamp(22px, 5.5vw, 38px);
  background: linear-gradient(135deg, var(--kc-cyan), var(--kc-pink-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.kc-hero-desc {
  margin: 0 0 32px;
  max-width: 540px;
  font-size: clamp(15px, 3.5vw, 18px);
  font-weight: 500;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.75);
}
.kc-hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.kc-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: rgba(255, 255, 255, 0.4);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
}
.kc-scroll-arrow {
  animation: kc-bounce 2s ease-in-out infinite;
}
@keyframes kc-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.kc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 28px;
  border: none;
  border-radius: var(--kc-radius-md);
  font-family: var(--kc-font);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}
.kc-btn:active { transform: translateY(1px); }

.kc-btn-cyan {
  background: var(--kc-cyan);
  color: var(--kc-dark);
  box-shadow: 0 4px 0 var(--kc-cyan-dark), 0 8px 20px rgba(47, 210, 255, 0.25);
}
.kc-btn-cyan:hover { transform: translateY(-1px); box-shadow: 0 5px 0 var(--kc-cyan-dark), 0 12px 28px rgba(47, 210, 255, 0.35); }
.kc-btn-cyan:active { box-shadow: 0 2px 0 var(--kc-cyan-dark); }

.kc-btn-blue {
  background: var(--kc-blue);
  color: #fff;
  box-shadow: 0 4px 0 var(--kc-blue-dark), 0 8px 20px rgba(61, 61, 234, 0.2);
}
.kc-btn-blue:hover { transform: translateY(-1px); box-shadow: 0 5px 0 var(--kc-blue-dark), 0 12px 28px rgba(61, 61, 234, 0.3); }
.kc-btn-blue:active { box-shadow: 0 2px 0 var(--kc-blue-dark); }

.kc-btn-copper {
  background: var(--kc-copper);
  color: #fff;
  box-shadow: 0 4px 0 var(--kc-copper-dark), 0 8px 20px rgba(184, 115, 51, 0.2);
}
.kc-btn-copper:hover { transform: translateY(-1px); }
.kc-btn-copper:active { box-shadow: 0 2px 0 var(--kc-copper-dark); }

.kc-btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.3);
}
.kc-btn-outline:hover { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.5); }

.kc-btn-outline-dark {
  background: transparent;
  color: var(--kc-text);
  border: 2px solid var(--kc-line-strong);
}
.kc-btn-outline-dark:hover { border-color: var(--kc-blue); color: var(--kc-blue); }

/* ==========================================================================
   STAGE SECTIONS (shared)
   ========================================================================== */
.kc-stage {
  padding: 56px 0;
  border-bottom: 1px solid var(--kc-line);
}
.kc-stage-header {
  margin-bottom: 32px;
}
.kc-stage-badge {
  display: inline-block;
  padding: 5px 14px;
  margin-bottom: 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.kc-stage-badge.cyan { background: var(--kc-cyan-wash); color: var(--kc-cyan-dark); border: 1px solid rgba(47,210,255,0.25); }
.kc-stage-badge.blue { background: var(--kc-blue-wash); color: var(--kc-blue); border: 1px solid rgba(61,61,234,0.2); }
.kc-stage-badge.pink { background: var(--kc-pink-wash); color: var(--kc-pink-dark); border: 1px solid rgba(243,16,186,0.2); }
.kc-stage-badge.copper { background: var(--kc-copper-wash); color: var(--kc-copper-dark); border: 1px solid rgba(184,115,51,0.2); }
.kc-stage-badge.gold {
  background: linear-gradient(135deg, rgba(184,115,51,0.15), rgba(47,210,255,0.15));
  color: var(--kc-copper-dark);
  border: 1px solid rgba(184,115,51,0.25);
}

.kc-stage-title {
  margin: 0 0 8px;
  font-size: clamp(26px, 6vw, 40px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--kc-text-strong);
}
.kc-stage-desc {
  margin: 0;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--kc-muted);
}

.kc-card-label {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--kc-blue);
}
.kc-card-label.cyan { color: var(--kc-cyan-dark); }
.kc-card-label.pink { color: var(--kc-pink); }
.kc-card-label.blue { color: var(--kc-blue); }
.kc-card-label.copper { color: var(--kc-copper); }

/* ==========================================================================
   STAGE 2 — DISCOVERY (story + videos)
   ========================================================================== */
.kc-stage-discovery {
  background: var(--kc-surface);
}

.kc-story-card {
  padding: 28px;
  margin-bottom: 28px;
  border-radius: var(--kc-radius-lg);
  border: 1px solid var(--kc-line);
  background: var(--kc-bg);
  box-shadow: var(--kc-shadow-soft);
}
.kc-story-card p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.65;
  color: var(--kc-body);
}
.kc-story-card p:last-child { margin-bottom: 0; }
.kc-disclaimer {
  font-size: 13px !important;
  color: var(--kc-muted) !important;
  font-style: italic;
}

.kc-highlight {
  margin: 20px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--kc-cyan);
  border-radius: 0 var(--kc-radius-sm) var(--kc-radius-sm) 0;
  background: var(--kc-cyan-wash);
  font-weight: 600;
  font-style: normal;
  color: var(--kc-text-strong);
  line-height: 1.5;
}

.kc-before-after {
  margin-bottom: 36px;
  border-radius: var(--kc-radius-lg);
  overflow: hidden;
  border: 1px solid var(--kc-line);
  box-shadow: var(--kc-shadow);
}
.kc-before-after img {
  display: block;
  width: 100%;
}

.kc-videos-header {
  margin-bottom: 20px;
}
.kc-videos-header h3 {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 800;
}
.kc-videos-header p {
  margin: 0;
  font-size: 15px;
  color: var(--kc-muted);
  line-height: 1.45;
}

/* ---- Video grid ---- */
.kc-video-grid {
  display: grid;
  gap: 16px;
}
.kc-video-card {
  border-radius: var(--kc-radius-lg);
  overflow: hidden;
  border: 1px solid var(--kc-line);
  background: var(--kc-surface);
  box-shadow: var(--kc-shadow-soft);
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.kc-video-card:hover { transform: translateY(-2px); box-shadow: var(--kc-shadow); }
.kc-video-card.is-featured { border-color: var(--kc-cyan); box-shadow: var(--kc-shadow), 0 0 0 1px var(--kc-cyan); }

.kc-video-embed {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: var(--kc-surface-3);
  cursor: pointer;
}
.kc-video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: none; }
.kc-video-thumb { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.kc-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 68px;
  height: 48px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  opacity: 0.85;
  transition: opacity 160ms ease, transform 160ms ease;
}
.kc-play-btn svg { width: 100%; height: 100%; }
.kc-video-embed:hover .kc-play-btn { opacity: 1; transform: translate(-50%, -50%) scale(1.08); }

.kc-video-meta { padding: 16px; }
.kc-video-badge {
  display: inline-block;
  padding: 4px 10px;
  margin-bottom: 8px;
  border-radius: 999px;
  background: var(--kc-surface-2);
  border: 1px solid var(--kc-line);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--kc-muted);
}
.kc-video-badge.featured { background: var(--kc-cyan-wash); border-color: rgba(47,210,255,0.3); color: var(--kc-cyan-dark); }

.kc-video-card h4 { margin: 0 0 4px; font-size: 17px; font-weight: 700; line-height: 1.2; }
.kc-video-card p { margin: 0; font-size: 14px; line-height: 1.45; color: var(--kc-muted); }

/* ==========================================================================
   STAGE 3 — PREDICTION
   ========================================================================== */
.kc-stage-predict {
  background: linear-gradient(180deg, var(--kc-bg), var(--kc-surface));
}
.kc-predict-card {
  padding: 28px;
  border-radius: var(--kc-radius-lg);
  border: 1px solid var(--kc-line);
  background: var(--kc-surface);
  box-shadow: var(--kc-shadow);
}
.kc-predict-question {
  margin: 0 0 20px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--kc-text);
}

/* ---- Choice buttons (shared for prediction + quiz) ---- */
.kc-choices {
  display: grid;
  gap: 10px;
  margin: 0 0 20px;
}
.kc-choice {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  min-height: 56px;
  padding: 14px 18px;
  border: 2px solid var(--kc-line);
  border-radius: var(--kc-radius-md);
  background: var(--kc-surface);
  color: var(--kc-text);
  font-family: var(--kc-font);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, transform 100ms ease;
}
.kc-choice:hover { border-color: var(--kc-blue); background: var(--kc-blue-wash); transform: translateY(-1px); }
.kc-choice.correct { border-color: var(--kc-green); background: var(--kc-green-wash); color: var(--kc-green-dark); }
.kc-choice.incorrect { border-color: var(--kc-ketchup); background: var(--kc-ketchup-wash); color: var(--kc-ketchup-dark); }
.kc-choice:disabled { cursor: default; opacity: 0.65; transform: none; }
.kc-choice:disabled:hover { border-color: var(--kc-line); background: var(--kc-surface); transform: none; }
.kc-choice.correct:disabled,
.kc-choice.incorrect:disabled { opacity: 1; }
.kc-choice.correct:disabled:hover { border-color: var(--kc-green); background: var(--kc-green-wash); }
.kc-choice.incorrect:disabled:hover { border-color: var(--kc-ketchup); background: var(--kc-ketchup-wash); }

.kc-choice-letter {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border-radius: 10px;
  background: var(--kc-surface-2);
  font-size: 14px;
  font-weight: 800;
  color: var(--kc-muted);
}
.kc-choice.correct .kc-choice-letter { background: var(--kc-green); color: #fff; }
.kc-choice.incorrect .kc-choice-letter { background: var(--kc-ketchup); color: #fff; }

.kc-choice-text { flex: 1; }

/* ---- Feedback ---- */
.kc-feedback {
  padding: 16px 20px;
  border-radius: var(--kc-radius-md);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.45;
  display: none;
}
.kc-feedback.show { display: block; }
.kc-feedback.correct { background: var(--kc-green-wash); border: 1px solid rgba(22,163,74,0.2); color: var(--kc-green-dark); }
.kc-feedback.incorrect { background: var(--kc-ketchup-wash); border: 1px solid rgba(217,48,37,0.2); color: var(--kc-ketchup-dark); }

/* ==========================================================================
   STAGE 4 — KETCHUP CHALLENGE (worksheet)
   ========================================================================== */
.kc-stage-challenge {
  background:
    radial-gradient(ellipse at 80% 20%, rgba(184, 115, 51, 0.06), transparent 50%),
    var(--kc-bg);
}
.kc-challenge-card {
  padding: 28px;
  border-radius: var(--kc-radius-lg);
  border: 1px solid var(--kc-line);
  background: var(--kc-surface);
  box-shadow: var(--kc-shadow);
}

.kc-progress-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.kc-progress-track {
  flex: 1;
  height: 10px;
  border-radius: 5px;
  background: var(--kc-surface-3);
  overflow: hidden;
}
.kc-progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 5px;
  background: linear-gradient(90deg, var(--kc-cyan), var(--kc-blue));
  transition: width 400ms ease;
}
.kc-progress-count {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 800;
  color: var(--kc-blue);
  min-width: 40px;
  text-align: right;
}

.kc-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}
.kc-step {
  counter-increment: step;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--kc-line);
  transition: opacity 300ms ease;
}
.kc-step:last-child { border-bottom: none; }
.kc-step.completed { opacity: 0.55; }

.kc-step-toggle {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  border: 2px solid var(--kc-line-strong);
  background: var(--kc-surface);
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}
.kc-step-toggle:hover { border-color: var(--kc-cyan); transform: scale(1.05); }
.kc-step-num::before {
  content: counter(step);
  font-family: var(--kc-font);
  font-weight: 900;
  font-size: 18px;
  color: var(--kc-muted);
}
.kc-step.completed .kc-step-toggle {
  border-color: var(--kc-cyan);
  background: var(--kc-cyan);
}
.kc-step.completed .kc-step-num::before {
  content: "\2713";
  color: #fff;
  font-size: 22px;
}

.kc-step-body h3 {
  margin: 4px 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
}
.kc-step-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--kc-body);
}

.kc-ws-done {
  margin-top: 24px;
  padding: 24px;
  border-radius: var(--kc-radius-md);
  background: linear-gradient(135deg, var(--kc-cyan-wash), var(--kc-blue-wash));
  border: 1px solid rgba(47,210,255,0.25);
  text-align: center;
  display: none;
}
.kc-ws-done.show { display: block; }
.kc-ws-done-icon { display: block; font-size: 36px; margin-bottom: 8px; }
.kc-ws-done strong { display: block; font-size: 18px; margin-bottom: 6px; }
.kc-ws-done p { margin: 0; font-size: 15px; color: var(--kc-body); line-height: 1.5; }

.kc-safety-notice {
  margin-top: 24px;
  padding: 16px 20px;
  border-radius: var(--kc-radius-md);
  background: rgba(217,48,37,0.05);
  border: 1px solid rgba(217,48,37,0.15);
  font-size: 13px;
  line-height: 1.55;
  color: var(--kc-body);
}
.kc-safety-notice strong { color: var(--kc-ketchup); }

/* ==========================================================================
   STAGE 5 — SCIENCE LAB
   ========================================================================== */
.kc-stage-science {
  background:
    radial-gradient(ellipse at 30% 30%, rgba(243, 16, 186, 0.05), transparent 50%),
    radial-gradient(ellipse at 70% 70%, rgba(47, 210, 255, 0.05), transparent 50%),
    var(--kc-surface);
}

.kc-learn-grid {
  display: grid;
  gap: 16px;
  margin-bottom: 40px;
}
.kc-learn-card {
  padding: 24px;
  border-radius: var(--kc-radius-lg);
  border: 1px solid var(--kc-line);
  background: var(--kc-bg);
  box-shadow: var(--kc-shadow-soft);
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.kc-learn-card:hover { transform: translateY(-2px); box-shadow: var(--kc-shadow); }
.kc-learn-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  margin-bottom: 14px;
  border-radius: 14px;
  font-size: 26px;
}
.kc-learn-acid .kc-learn-icon { background: var(--kc-ketchup-wash); border: 1px solid rgba(217,48,37,0.18); }
.kc-learn-citric .kc-learn-icon { background: var(--kc-cyan-wash); border: 1px solid rgba(47,210,255,0.25); }
.kc-learn-reaction .kc-learn-icon { background: var(--kc-blue-wash); border: 1px solid rgba(61,61,234,0.2); }
.kc-learn-card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 800; line-height: 1.15; }
.kc-learn-card p { margin: 0; font-size: 15px; line-height: 1.55; color: var(--kc-body); }

/* ---- Radio ---- */
.kc-radio-section {
  padding: 28px;
  margin-bottom: 40px;
  border-radius: var(--kc-radius-lg);
  border: 1px solid rgba(243,16,186,0.2);
  background:
    radial-gradient(ellipse at 30% 50%, rgba(243,16,186,0.06), transparent 50%),
    radial-gradient(ellipse at 70% 50%, rgba(47,210,255,0.06), transparent 50%),
    var(--kc-bg);
  box-shadow: var(--kc-shadow);
}
.kc-radio-section h3 { margin: 0 0 6px; font-size: 20px; font-weight: 800; }
.kc-radio-section > p { margin: 0 0 20px; font-size: 15px; color: var(--kc-body); line-height: 1.5; }
.kc-radio-player {
  border-radius: var(--kc-radius-md);
  overflow: hidden;
  border: 1px solid var(--kc-line);
}

/* ---- Quiz ---- */
.kc-quiz-section {
  padding: 28px;
  border-radius: var(--kc-radius-lg);
  border: 1px solid var(--kc-line);
  background: var(--kc-bg);
  box-shadow: var(--kc-shadow);
}
.kc-quiz-section h3 { margin: 0 0 6px; font-size: 22px; font-weight: 800; }
.kc-quiz-section > p { margin: 0 0 24px; font-size: 15px; color: var(--kc-muted); line-height: 1.45; }

.kc-quiz-questions { display: grid; gap: 24px; }
.kc-quiz-q {
  padding: 22px;
  border-radius: var(--kc-radius-md);
  border: 1px solid var(--kc-line);
  background: var(--kc-surface);
}
.kc-quiz-num {
  display: inline-block;
  padding: 4px 10px;
  margin-bottom: 10px;
  border-radius: 999px;
  background: var(--kc-blue-wash);
  border: 1px solid rgba(61,61,234,0.15);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--kc-blue);
}
.kc-quiz-q h4 { margin: 0 0 14px; font-size: 16px; font-weight: 700; line-height: 1.4; }

.kc-quiz-result {
  margin-top: 24px;
  display: none;
}
.kc-quiz-result.show { display: block; }
.kc-quiz-score-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 28px;
  border-radius: var(--kc-radius-lg);
  background: linear-gradient(135deg, var(--kc-blue-wash), var(--kc-pink-wash));
  border: 1px solid rgba(61,61,234,0.15);
  text-align: center;
}
.kc-quiz-score-icon { font-size: 40px; }
.kc-quiz-score-num { font-size: 40px; font-weight: 900; color: var(--kc-blue); }
.kc-quiz-score-label { font-size: 15px; font-weight: 600; color: var(--kc-body); margin-bottom: 10px; }

/* ==========================================================================
   STAGE 6 — FINISH LINE
   ========================================================================== */
.kc-stage-finish {
  background:
    radial-gradient(ellipse at 50% 30%, rgba(47,210,255,0.1), transparent 50%),
    radial-gradient(ellipse at 50% 70%, rgba(243,16,186,0.06), transparent 50%),
    var(--kc-dark);
  color: #fff;
  border-bottom: none;
  text-align: center;
  padding: 64px 0;
}
.kc-stage-finish .kc-stage-badge.gold {
  background: rgba(255,255,255,0.1);
  color: var(--kc-cyan);
  border-color: rgba(47,210,255,0.3);
}
.kc-stage-finish .kc-stage-header { text-align: center; }
.kc-finish-title {
  color: #fff !important;
}
.kc-finish-title span {
  background: linear-gradient(135deg, var(--kc-cyan), var(--kc-pink-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.kc-finish-desc {
  color: rgba(255,255,255,0.7) !important;
  margin-inline: auto;
}

/* ---- Achievements panel ---- */
.kc-achievements {
  margin: 32px auto;
  max-width: 520px;
}
.kc-achievements-title {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
}
.kc-badge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.kc-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 18px 12px;
  border-radius: var(--kc-radius-md);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  opacity: 0.5;
  transition: opacity 300ms ease, border-color 300ms ease, background 300ms ease;
}
.kc-badge.earned {
  opacity: 1;
  border-color: var(--kc-cyan);
  background: rgba(47,210,255,0.1);
}
.kc-badge-icon { font-size: 28px; }
.kc-badge strong { font-size: 13px; font-weight: 800; }
.kc-badge-status { font-size: 11px; color: rgba(255,255,255,0.5); }
.kc-badge.earned .kc-badge-status { color: var(--kc-cyan); }
.kc-badge-champion { grid-column: 1 / -1; }
.kc-badge-champion.earned {
  border-color: var(--kc-pink-light);
  background: linear-gradient(135deg, rgba(47,210,255,0.12), rgba(243,16,186,0.12));
}

/* ---- Finish actions ---- */
.kc-finish-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 36px 0;
}
.kc-finish-actions .kc-btn-outline-dark {
  color: #fff;
  border-color: rgba(255,255,255,0.3);
}
.kc-finish-actions .kc-btn-outline-dark:hover { border-color: rgba(255,255,255,0.6); color: #fff; }

.kc-finish-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: 40px;
  color: rgba(255,255,255,0.5);
  font-size: 13px;
  font-weight: 600;
}
.kc-finish-logo {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  object-fit: contain;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.kc-footer {
  padding: 28px 0;
  border-top: 1px solid var(--kc-line);
  text-align: center;
}
.kc-footer-inner { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.kc-footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
}
.kc-footer-logo {
  width: 24px;
  height: 24px;
  border-radius: 5px;
  object-fit: contain;
}
.kc-footer-text {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--kc-text-strong);
}
.kc-footer-sep { color: var(--kc-muted); font-weight: 400; margin: 0 2px; }
.kc-footer p { margin: 0; font-size: 13px; color: var(--kc-muted); line-height: 1.5; }
.kc-footer a { color: var(--kc-blue); text-decoration: none; }
.kc-footer a:hover { text-decoration: underline; }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (min-width: 600px) {
  .kc-video-grid { grid-template-columns: repeat(2, 1fr); }
  .kc-video-card.is-featured { grid-column: 1 / -1; }
  .kc-learn-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 599px) {
  .kc-topbar-nav { display: none; }
  .kc-badge-grid { grid-template-columns: 1fr; }
  .kc-badge-champion { grid-column: auto; }
  .kc-finish-actions { flex-direction: column; align-items: center; }
  .kc-finish-actions .kc-btn { width: 100%; max-width: 320px; }
}

@media (max-width: 400px) {
  .kc-container { padding-inline: 14px; }
  .kc-hero { padding: 44px 0 36px; }
  .kc-hero-logo { width: 56px; height: 56px; }
  .kc-hero-line1 { font-size: 28px; }
  .kc-hero-line2 { font-size: 19px; }
  .kc-hero-desc { font-size: 14px; }
  .kc-stage { padding: 40px 0; }
  .kc-stage-title { font-size: 24px; }
  .kc-story-card, .kc-predict-card, .kc-challenge-card, .kc-quiz-section, .kc-radio-section { padding: 20px; }
  .kc-learn-card { padding: 18px; }
  .kc-quiz-q { padding: 16px; }
  .kc-btn {
    width: 100%;
    min-height: 48px;
    font-size: 13px;
    padding: 0 18px;
  }
  .kc-hero-ctas { flex-direction: column; }
  .kc-step { grid-template-columns: 48px 1fr; gap: 12px; }
  .kc-step-toggle { width: 48px; height: 48px; }
  .kc-choice { min-height: 52px; padding: 12px 14px; gap: 10px; }
  .kc-choice-letter { width: 32px; height: 32px; flex: 0 0 32px; }
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .kc-page,
  .kc-page *,
  .kc-page *::before,
  .kc-page *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.kc-page :is(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--kc-blue);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--kc-cyan-wash);
}