/* ============================================
   THE BITCOIN JOURNEY — Design System
   Version: 0.1
   
   ALL visual design lives here.
   Change this file to reskin the app.
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Core palette */
  --color-bg: #0a0a0b;
  --color-bg-raised: #141416;
  --color-bg-card: #1a1a1f;
  --color-bg-card-hover: #22222a;
  --color-bg-input: #1a1a1f;
  --color-border: #2a2a33;
  --color-border-subtle: #1e1e26;
  
  /* Text */
  --color-text: #e8e6e3;
  --color-text-secondary: #8a8892;
  --color-text-muted: #5a5866;
  
  /* Accent — Bitcoin orange */
  --color-accent: #f7931a;
  --color-accent-hover: #ffab40;
  --color-accent-glow: rgba(247, 147, 26, 0.15);
  --color-accent-subtle: rgba(247, 147, 26, 0.08);
  
  /* Status */
  --color-success: #34d399;
  --color-success-bg: rgba(52, 211, 153, 0.1);
  --color-warning: #fbbf24;
  --color-incomplete: #3a3a44;
  --color-error: #f87171;
  --color-error-bg: rgba(248, 113, 113, 0.1);
  
  /* Typography */
  --font-display: 'Satoshi', 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Shadows */
  --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 0 0 1px var(--color-border-subtle);
  --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.4), 0 0 0 1px var(--color-border);
  --shadow-glow: 0 0 30px var(--color-accent-glow);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Layout */
  --content-max-width: 720px;
  --dashboard-max-width: 880px;
}

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&display=swap');
@import url('https://api.fontshare.com/v2/css?f[]=satoshi@700,900&display=swap');

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
}

/* Subtle grain texture */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

/* --- Landing Screen --- */
.screen-landing {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-xl);
  position: relative;
  z-index: 1;
}

.landing-glow {
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  animation: pulse-glow 4s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.5; transform: translateX(-50%) scale(1); }
  50% { opacity: 0.8; transform: translateX(-50%) scale(1.1); }
}

.landing-logo {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  animation: float-in 0.8s var(--transition-slow) both;
}

.landing-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: var(--space-sm);
  animation: float-in 0.8s var(--transition-slow) 0.1s both;
}

.landing-title .accent {
  color: var(--color-accent);
}

.landing-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  text-align: center;
  margin-bottom: var(--space-2xl);
  animation: float-in 0.8s var(--transition-slow) 0.2s both;
}

.landing-form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
  max-width: 360px;
  animation: float-in 0.8s var(--transition-slow) 0.3s both;
}

.landing-form label {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.input-name {
  width: 100%;
  padding: 0.85rem 1.2rem;
  font-family: var(--font-body);
  font-size: 1.1rem;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  text-align: center;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-name:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.input-name::placeholder {
  color: var(--color-text-muted);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.85rem 2rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: #0a0a0b;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

@keyframes float-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Dashboard Screen --- */
.screen-dashboard {
  max-width: var(--dashboard-max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
  position: relative;
  z-index: 1;
}

.dashboard-header {
  margin-bottom: var(--space-2xl);
}

.dashboard-greeting {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xs);
}

.dashboard-progress-bar {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.progress-track {
  width: 100%;
  height: 6px;
  background: var(--color-bg-card);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  border-radius: 3px;
  transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.progress-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* Week Cards */
.weeks-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.week-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-base), transform var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.week-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.week-card.is-current {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent), var(--shadow-glow);
}

.week-card.is-complete {
  border-color: var(--color-success);
}

.week-card.is-empty {
  opacity: 0.5;
  cursor: default;
}

.week-card.is-empty .week-title {
  color: var(--color-text-muted);
}

.week-card.is-empty .week-number {
  background: var(--color-bg);
  color: var(--color-text-muted);
}

.week-card.is-empty:hover {
  transform: none;
  box-shadow: var(--shadow-card);
}

.week-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.week-card.is-complete .week-number {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.week-info {
  flex: 1;
  min-width: 0;
}

.week-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 2px;
}

.week-description {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.week-status {
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
}

.week-status.status-not-started {
  background: var(--color-bg);
  color: var(--color-text-muted);
}

.week-status.status-in-progress {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.week-status.status-complete {
  background: var(--color-success-bg);
  color: var(--color-success);
}

/* Recommended badge on dashboard */
.week-recommended-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: #0a0a0b;
  margin-left: var(--space-sm);
  vertical-align: middle;
}

/* Mini progress counter in week status */
.week-mini-progress {
  font-variant-numeric: tabular-nums;
  margin-right: var(--space-xs);
}

/* Week progress bar inside week view */
.week-progress-mini {
  margin-top: var(--space-lg);
}

.week-progress-mini .progress-track {
  height: 4px;
}

.week-progress-mini .progress-label {
  font-size: 0.8rem;
}

/* --- Week View Screen --- */
.screen-week {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
  position: relative;
  z-index: 1;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

.btn-back:hover {
  color: var(--color-accent);
}

.week-header {
  margin-bottom: var(--space-2xl);
}

.week-header-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xs);
}

.week-header-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 900;
  letter-spacing: -0.02em;
}

/* Unit blocks */
.unit-block {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border-subtle);
  animation: fade-up 0.5s var(--transition-slow) both;
}

.unit-block:last-child {
  border-bottom: none;
}

.unit-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.unit-label .badge {
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.unit-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.unit-intro {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: var(--space-lg);
  white-space: pre-line;
}

.unit-intro a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent-subtle);
  transition: border-color var(--transition-fast);
}

.unit-intro a:hover {
  border-color: var(--color-accent);
}

/* Video embed */
.video-container {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  margin-bottom: var(--space-lg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-raised);
  box-shadow: var(--shadow-card);
}

.video-container iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* PDF link — prominent for PDF-primary weeks */
.pdf-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--space-lg);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  box-shadow: 0 0 0 0 var(--color-accent-glow);
}

.pdf-link:hover {
  background: var(--color-bg-card-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* Mark as done button */
.btn-mark-done {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-mark-done:hover {
  border-color: var(--color-success);
  color: var(--color-success);
}

.btn-mark-done.is-done {
  border-color: var(--color-success);
  background: var(--color-success-bg);
  color: var(--color-success);
  cursor: default;
}

/* ==========================================
   Quiz UX
   ========================================== */

.quiz-block {
  margin-top: var(--space-lg);
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base);
}

.quiz-block.is-correct {
  border-color: var(--color-success);
}

.quiz-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.quiz-question {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: var(--space-lg);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 0.85rem var(--space-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text);
  text-align: left;
  width: 100%;
}

.quiz-option:hover:not(.is-disabled) {
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.quiz-option .option-letter {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.8rem;
  background: var(--color-bg-raised);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.quiz-option:hover:not(.is-disabled) .option-letter {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.quiz-option .option-text {
  flex: 1;
}

.quiz-option.is-wrong {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

.quiz-option.is-wrong .option-letter {
  background: var(--color-error);
  color: #0a0a0b;
  border-color: var(--color-error);
}

.quiz-option.is-correct {
  border-color: var(--color-success);
  background: var(--color-success-bg);
}

.quiz-option.is-correct .option-letter {
  background: var(--color-success);
  color: #0a0a0b;
  border-color: var(--color-success);
}

.quiz-option.is-disabled {
  cursor: default;
  opacity: 0.5;
}

.quiz-option.is-correct.is-disabled,
.quiz-option.is-wrong.is-disabled {
  opacity: 1;
}

.quiz-explanation {
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-success-bg);
  border-left: 3px solid var(--color-success);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
  animation: fade-in 0.3s ease both;
}

.quiz-explanation.is-wrong {
  background: var(--color-error-bg);
  border-left-color: var(--color-error);
}

.quiz-explanation strong {
  color: var(--color-success);
  font-weight: 600;
}

.quiz-explanation.is-wrong strong {
  color: var(--color-error);
}

.quiz-completed {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-success-bg);
  border-radius: var(--radius-md);
  color: var(--color-success);
  font-weight: 600;
  font-size: 0.95rem;
  animation: scale-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.quiz-try-again {
  margin-top: var(--space-md);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
  animation: fade-in 0.3s ease 0.3s both;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scale-in {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

.quiz-block.is-shake {
  animation: shake 0.4s ease;
}

/* Text content (bonus resources) */
.text-content {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: var(--space-lg);
}

.text-content h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.text-content h3:first-child {
  margin-top: 0;
}

.text-content ul {
  list-style: none;
  padding: 0;
}

.text-content li {
  padding: var(--space-xs) 0;
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-border-subtle);
  margin-bottom: var(--space-xs);
}

.text-content a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent-subtle);
  transition: border-color var(--transition-fast);
}

.text-content a:hover {
  border-color: var(--color-accent);
}

.text-content p {
  margin-bottom: var(--space-md);
}

/* Proof of Work section */
.pow-section {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.pow-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.pow-recommended {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

.pow-intro {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: var(--space-md);
  white-space: pre-line;
}

.pow-questions {
  list-style: none;
  margin-bottom: var(--space-lg);
}

.pow-questions li {
  color: var(--color-text);
  font-weight: 500;
  padding: var(--space-sm) 0;
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-accent-subtle);
  margin-bottom: var(--space-sm);
}

.pow-textarea {
  width: 100%;
  min-height: 150px;
  padding: var(--space-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.65;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.pow-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.pow-textarea::placeholder {
  color: var(--color-text-muted);
}

/* Dark scrollbar for textarea */
.pow-textarea::-webkit-scrollbar {
  width: 8px;
}
.pow-textarea::-webkit-scrollbar-track {
  background: var(--color-bg);
  border-radius: 4px;
}
.pow-textarea::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}
.pow-textarea::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}
.pow-textarea {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-bg);
}

.pow-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.btn-save {
  padding: 0.6rem 1.4rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: #0a0a0b;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-save:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.save-feedback {
  font-size: 0.85rem;
  color: var(--color-success);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.save-feedback.is-visible {
  opacity: 1;
}

/* Week bottom navigation */
.week-bottom-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-subtle);
  gap: var(--space-md);
}

.btn-next-week {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: #0a0a0b;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-next-week:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

/* Footer / Reset */
.dashboard-footer {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  justify-content: center;
}

.btn-reset {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: none;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-reset:hover {
  color: #ef4444;
  border-color: #ef4444;
}

/* ==========================================
   Language Selector
   ========================================== */

.lang-section {
  margin-bottom: var(--space-xl);
}

.lang-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.lang-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem var(--space-md);
  background: var(--color-bg-card);
  border: 2px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

.lang-option:hover:not(.is-coming-soon) {
  border-color: var(--color-accent);
  color: var(--color-text);
  background: var(--color-accent-subtle);
}

.lang-option.is-selected {
  border-color: var(--color-accent);
  color: var(--color-text);
  box-shadow: 0 0 15px var(--color-accent-glow);
}

.lang-option.is-coming-soon {
  opacity: 0.35;
  cursor: not-allowed;
}

.lang-flag {
  width: 24px;
  height: 18px;
  border-radius: 3px;
  object-fit: cover;
  flex-shrink: 0;
}

.lang-name {
  flex: 1;
  text-align: left;
}

.lang-soon {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

/* ==========================================
   AI Feedback for Proof of Work
   ========================================== */

.pow-highlight {
  color: var(--color-accent);
  font-weight: 600;
}

.btn-submit-feedback {
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: #0a0a0b;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-submit-feedback:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-submit-feedback:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-save-draft {
  padding: 0.6rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.btn-save-draft:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.pow-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

.pow-loading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
  color: var(--color-accent);
}

.pow-loading.is-hidden {
  display: none;
}

.pow-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Feedback display */
.pow-feedback {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  box-shadow: 0 0 20px var(--color-accent-glow);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.pow-feedback.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.pow-feedback-error {
  border-color: var(--color-error);
  box-shadow: none;
}

.pow-feedback-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.pow-feedback-text {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text);
}

.pow-feedback-text p {
  margin-bottom: var(--space-sm);
}

.pow-feedback-text strong {
  color: var(--color-accent);
}

.pow-feedback-toggle {
  margin-top: var(--space-md);
}

.btn-toggle-detail {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  background: none;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.btn-toggle-detail:hover {
  background: var(--color-accent-subtle);
}

.pow-feedback-long {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-subtle);
}

.pow-feedback-long.is-hidden {
  display: none;
}

/* ==========================================
   Badge Gallery
   ========================================== */

.badge-gallery {
  margin-top: var(--space-2xl);
}

.badge-gallery-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.badge-summary {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.badge-summary strong {
  color: var(--color-accent);
}

.badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-md);
}

.badge-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg) var(--space-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.badge-card.is-locked {
  opacity: 0.35;
}

.badge-card.is-locked .badge-icon {
  filter: grayscale(1);
}

.badge-card.is-earned {
  border-color: var(--color-accent);
  box-shadow: 0 0 20px var(--color-accent-glow);
}

.badge-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.badge-card.is-earned .badge-icon {
  animation: badge-pulse 2s ease infinite;
}

@keyframes badge-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.badge-name {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.badge-card.is-locked .badge-name {
  color: var(--color-text-muted);
}

.badge-desc {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.badge-card.is-earned .badge-desc {
  color: var(--color-text-secondary);
}

/* Badge unlock popup sparkle */
.gam-popup-icon-wrapper {
  position: relative;
  display: inline-block;
}

.gam-popup-icon-wrapper::before {
  content: '';
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  animation: sparkle-ring 1.5s ease infinite;
}

@keyframes sparkle-ring {
  0%, 100% { opacity: 0.5; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.1); }
}

/* ==========================================
   Gamification UI
   ========================================== */

/* Dashboard gamification header */
.gam-header {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
}

.gam-level-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.gam-level-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: #0a0a0b;
}

.gam-level-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
}

.gam-sats-display {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.gam-sats-icon {
  font-size: 1rem;
}

.gam-sats-count {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.gam-sats-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.gam-level-bar {
  margin-top: var(--space-xs);
}

.gam-level-track {
  width: 100%;
  height: 6px;
  background: var(--color-bg);
  border-radius: 3px;
  overflow: hidden;
}

.gam-level-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  border-radius: 3px;
  transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.gam-level-next {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* Streak display */
.gam-streak {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-accent-subtle);
  border: 1px solid rgba(247, 147, 26, 0.2);
  border-radius: var(--radius-md);
}

.gam-streak-icon {
  font-size: 1.2rem;
}

.gam-streak-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
}

/* Week view sats counter */
.week-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.gam-week-counter {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.3rem 0.75rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
}

.gam-week-counter .gam-sats-count {
  font-size: 1rem;
}

.gam-week-counter .gam-sats-label {
  font-size: 0.75rem;
}

/* Quiz sats hint */
.gam-quiz-hint {
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent-subtle);
  border-radius: var(--radius-sm);
  display: inline-block;
}

/* Floating sats animation */
.gam-sats-float {
  position: fixed;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-accent);
  pointer-events: none;
  z-index: 1000;
  animation: sats-float 1.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  text-shadow: 0 0 10px var(--color-accent-glow);
}

@keyframes sats-float {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-80px) scale(1.3); }
}

/* Level up popup */
.gam-popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(4px);
}

.gam-popup-overlay.is-visible {
  opacity: 1;
}

.gam-popup {
  background: var(--color-bg-card);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl) var(--space-3xl);
  text-align: center;
  box-shadow: 0 0 60px var(--color-accent-glow), var(--shadow-glow);
  transform: scale(0.8);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 360px;
  width: 90%;
}

.gam-popup-overlay.is-visible .gam-popup {
  transform: scale(1);
}

.gam-popup-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  animation: popup-bounce 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
}

@keyframes popup-bounce {
  0% { transform: scale(0); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.gam-popup-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.gam-popup-level {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.gam-popup-name {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.gam-popup-btn {
  padding: 0.75rem 2rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: #0a0a0b;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.gam-popup-btn:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* --- Animations --- */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.week-card { animation: fade-up 0.4s var(--transition-slow) both; }
.week-card:nth-child(1) { animation-delay: 0.05s; }
.week-card:nth-child(2) { animation-delay: 0.1s; }
.week-card:nth-child(3) { animation-delay: 0.15s; }
.week-card:nth-child(4) { animation-delay: 0.2s; }
.week-card:nth-child(5) { animation-delay: 0.25s; }
.week-card:nth-child(6) { animation-delay: 0.3s; }
.week-card:nth-child(7) { animation-delay: 0.35s; }
.week-card:nth-child(8) { animation-delay: 0.4s; }
.week-card:nth-child(9) { animation-delay: 0.45s; }
.week-card:nth-child(10) { animation-delay: 0.5s; }
.week-card:nth-child(11) { animation-delay: 0.55s; }

.unit-block:nth-child(1) { animation-delay: 0.1s; }
.unit-block:nth-child(2) { animation-delay: 0.2s; }
.unit-block:nth-child(3) { animation-delay: 0.3s; }
.unit-block:nth-child(4) { animation-delay: 0.4s; }
.unit-block:nth-child(5) { animation-delay: 0.5s; }
.unit-block:nth-child(6) { animation-delay: 0.6s; }

/* --- Responsive --- */
@media(max-width: 640px) {
  .screen-dashboard,
  .screen-week {
    padding: var(--space-lg) var(--space-md);
  }
  
  .week-card {
    padding: var(--space-md);
    gap: var(--space-md);
  }
  
  .week-number {
    width: 40px;
    height: 40px;
    font-size: 0.95rem;
  }
  
  .week-status {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
  }
  
  .pow-section {
    padding: var(--space-lg) var(--space-md);
  }
  
  .pow-questions li {
    padding: var(--space-sm) 0 var(--space-sm) var(--space-md);
    margin-bottom: var(--space-md);
    line-height: 1.6;
  }
  
  .pow-textarea {
    min-height: 180px;
  }
  
  .pdf-link {
    padding: var(--space-md) var(--space-lg);
  }
  
  .week-recommended-badge {
    display: block;
    width: fit-content;
    margin-left: 0;
    margin-top: var(--space-xs);
  }
  
  .week-bottom-nav {
    flex-direction: column-reverse;
    gap: var(--space-md);
  }
  
  .week-bottom-nav .btn-back {
    margin-bottom: 0;
  }
  
  .btn-next-week {
    width: 100%;
    justify-content: center;
  }
  
  .quiz-block {
    padding: var(--space-lg) var(--space-md);
  }
  
  .quiz-option {
    padding: 0.75rem var(--space-md);
  }
  
  .gam-header {
    padding: var(--space-md);
  }
  
  .gam-popup {
    padding: var(--space-xl) var(--space-lg);
  }
  
  .week-top-bar {
    gap: var(--space-sm);
  }
  
  .badge-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--space-sm);
  }
  
  .badge-card {
    padding: var(--space-md) var(--space-sm);
  }
  
  .badge-icon {
    font-size: 1.6rem;
  }
  
  .pow-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn-submit-feedback {
    width: 100%;
  }
  
  .pow-feedback {
    padding: var(--space-md);
  }
}