/* ==========================================================================
   YOSHINKAN DOJO HUB - Sistema de Diseño Japones Contemporáneo
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-dark: #101014;
  --bg-card: #18181F;
  --bg-card-hover: #22222B;
  --bg-surface: #262632;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(211, 47, 47, 0.4);
  --border-gold: rgba(212, 175, 55, 0.4);
  
  --crimson: #D32F2F;
  --crimson-glow: rgba(211, 47, 47, 0.25);
  --crimson-bright: #E60026;
  
  --gold: #D4AF37;
  --gold-glow: rgba(212, 175, 55, 0.2);
  
  --text-main: #FAFAFC;
  --text-muted: #9E9EA5;
  --text-dim: #6E6E78;
  
  --success: #2E7D32;
  --success-glow: rgba(46, 125, 50, 0.3);
  --error: #C62828;
  --error-glow: rgba(198, 40, 40, 0.3);

  /* Typography */
  --font-jp: 'Noto Serif JP', serif;
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  
  /* Shadows & Elevation */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-crimson: 0 0 20px rgba(211, 47, 47, 0.35);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(211, 47, 47, 0.08) 0%, transparent 60%),
    radial-gradient(circle at 100% 100%, rgba(212, 175, 55, 0.04) 0%, transparent 40%);
  background-attachment: fixed;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, select {
  font-family: inherit;
}

/* Layout Header & Navbar */
.dojo-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(16, 16, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.85rem 2rem;
}

.header-container {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.dojo-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-emblem {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--crimson-bright), #800000);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px var(--crimson-glow);
  border: 1px solid rgba(255, 255, 255, 0.2);
  font-family: var(--font-jp);
  font-weight: 900;
  font-size: 1.2rem;
  color: #FFF;
}

.brand-text h1 {
  font-family: var(--font-jp);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  line-height: 1.2;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.dojo-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.3rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link.active {
  color: #FFF;
  background: var(--crimson);
  box-shadow: 0 2px 10px var(--crimson-glow);
}

/* Kyu Rank Widget */
.kyu-widget {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  background: var(--bg-card);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-gold);
  box-shadow: 0 0 12px var(--gold-glow);
}

.kyu-badge-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold), #997A15);
  color: #101014;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
}

.kyu-info {
  display: flex;
  flex-direction: column;
}

.kyu-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--gold);
}

.kyu-xp {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Main Container */
.dojo-main {
  max-width: 1300px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

/* Hero Header Banner */
.hero-banner {
  position: relative;
  background: linear-gradient(135deg, #1C1C24 0%, #121218 100%);
  border-radius: var(--radius-lg);
  padding: 2.5rem 3rem;
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
}

.hero-banner::before {
  content: "養神館";
  position: absolute;
  right: -20px;
  bottom: -30px;
  font-family: var(--font-jp);
  font-size: 10rem;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.02);
  pointer-events: none;
  user-select: none;
}

.hero-content {
  max-width: 650px;
  z-index: 1;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--crimson-glow);
  color: var(--crimson-bright);
  border: 1px solid var(--border-accent);
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}

.hero-title {
  font-family: var(--font-jp);
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 0.85rem;
  background: linear-gradient(180deg, #FFFFFF 0%, #D0D0D8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.hero-stats {
  display: flex;
  gap: 2rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-family: var(--font-jp);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--gold);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Category Filter Bar */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  background: var(--bg-card);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.filter-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid transparent;
  transition: var(--transition-fast);
}

.filter-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.filter-btn.active {
  background: var(--crimson);
  color: #FFF;
  border-color: var(--crimson-bright);
  box-shadow: 0 0 12px var(--crimson-glow);
}

.search-box {
  position: relative;
  min-width: 280px;
}

.search-input {
  width: 100%;
  padding: 0.55rem 1rem 0.55rem 2.5rem;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.88rem;
  transition: var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--crimson);
  box-shadow: 0 0 0 3px var(--crimson-glow);
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.dojo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}

.dojo-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md), var(--shadow-crimson);
}

.card-diagram-preview {
  height: 220px;
  background: radial-gradient(circle at 50% 50%, #20202A 0%, #121218 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  position: relative;
  border-bottom: 1px solid var(--border-subtle);
}

.card-category-badge {
  position: absolute;
  top: 0.85rem;
  left: 0.85rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  border: 1px solid var(--border-subtle);
  color: var(--gold);
}

.card-kyu-badge {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--crimson-glow);
  color: var(--crimson-bright);
  border: 1px solid var(--border-accent);
}

.card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-header-titles {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.5rem;
}

.card-romaji {
  font-family: var(--font-jp);
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFF;
}

.card-kanji {
  font-family: var(--font-jp);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.card-translation {
  font-size: 0.88rem;
  color: var(--crimson-bright);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.card-desc {
  font-size: 0.83rem;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 1rem;
}

.card-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.card-steps-count {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-view-detail {
  color: var(--gold);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: var(--transition-fast);
}

.dojo-card:hover .btn-view-detail {
  color: #FFF;
  transform: translateX(3px);
}

/* Technical Detail Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg), var(--shadow-crimson);
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.2);
}

.modal-title-group h2 {
  font-family: var(--font-jp);
  font-size: 1.6rem;
  font-weight: 700;
}

.modal-title-group span {
  font-size: 0.9rem;
  color: var(--crimson-bright);
  font-weight: 600;
}

.btn-close-modal {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.btn-close-modal:hover {
  background: var(--crimson);
  color: #FFF;
}

.modal-body {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 768px) {
  .modal-body {
    grid-template-columns: 1fr;
  }
}

.modal-diagram-container {
  background: radial-gradient(circle at 50% 50%, #22222E 0%, #121218 100%);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.modal-info-panel h3 {
  font-family: var(--font-jp);
  font-size: 1.1rem;
  color: var(--gold);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.steps-list {
  list-style: none;
  margin-bottom: 1.5rem;
}

.step-item {
  display: flex;
  gap: 0.85rem;
  margin-bottom: 0.85rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--crimson);
}

.step-num {
  font-weight: 800;
  color: var(--crimson-bright);
  font-size: 0.9rem;
  min-width: 22px;
}

.step-text {
  font-size: 0.85rem;
  color: var(--text-main);
}

.checkpoints-container {
  background: rgba(212, 175, 55, 0.05);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.checkpoint-item {
  font-size: 0.82rem;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  display: flex;
  gap: 0.5rem;
}

.checkpoint-item::before {
  content: "✦";
  color: var(--gold);
}

/* Dojo Challenge (Quiz Module) */
.challenge-container {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 900px;
  margin: 0 auto 3rem;
  box-shadow: var(--shadow-md);
}

.challenge-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.challenge-mode-switcher {
  display: flex;
  gap: 0.5rem;
  background: rgba(0, 0, 0, 0.4);
  padding: 0.3rem;
  border-radius: var(--radius-full);
}

.mode-btn {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.mode-btn.active {
  background: var(--crimson);
  color: #FFF;
}

.quiz-score-board {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.score-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 700;
  color: var(--gold);
}

.streak-badge {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 700;
  color: #FF7043;
}

/* Quiz Mode A: Guess Technique */
.quiz-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.quiz-question-box {
  background: radial-gradient(circle at 50% 50%, #22222E 0%, #121218 100%);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.quiz-question-box h3 {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 600px) {
  .options-grid {
    grid-template-columns: 1fr;
  }
}

.option-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  text-align: left;
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.option-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.option-romaji {
  font-family: var(--font-jp);
  font-size: 1.1rem;
  font-weight: 700;
  color: #FFF;
}

.option-kanji {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.option-btn.correct {
  background: var(--success-glow) !important;
  border-color: #4CAF50 !important;
  color: #FFF;
  animation: pulseGreen 0.3s ease-out;
}

.option-btn.incorrect {
  background: var(--error-glow) !important;
  border-color: #F44336 !important;
  color: #FFF;
  animation: shake 0.3s ease-out;
}

@keyframes pulseGreen {
  0% { transform: scale(1); }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

.quiz-feedback-banner {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  animation: fadeIn 0.2s ease-out;
}

.quiz-feedback-banner.success {
  background: rgba(46, 125, 50, 0.2);
  border: 1px solid #4CAF50;
  color: #81C784;
}

.quiz-feedback-banner.error {
  background: rgba(198, 40, 40, 0.2);
  border: 1px solid #E57373;
  color: #EF9A9A;
}

.btn-next-question {
  background: var(--crimson);
  color: #FFF;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 0 12px var(--crimson-glow);
  transition: var(--transition-fast);
}

.btn-next-question:hover {
  background: var(--crimson-bright);
  transform: translateY(-2px);
}

/* Quiz Mode B: Order Sequence */
.sequence-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sequence-target-info {
  background: rgba(255, 255, 255, 0.03);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--gold);
}

.sequence-slots {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sequence-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.15rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: grab;
  user-select: none;
  transition: var(--transition-fast);
}

.sequence-item:active {
  cursor: grabbing;
  background: var(--bg-card-hover);
}

.sequence-item.correct-pos {
  border-color: #4CAF50;
  background: rgba(46, 125, 50, 0.15);
}

.sequence-item.wrong-pos {
  border-color: #F44336;
  background: rgba(198, 40, 40, 0.15);
}

.item-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.item-index-badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.item-controls {
  display: flex;
  gap: 0.3rem;
}

.btn-step-move {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.btn-step-move:hover {
  background: var(--crimson);
  color: #FFF;
}

/* Principles Guide Section */
.principles-section {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  max-width: 1100px;
  margin: 0 auto 3rem;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.principle-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: var(--transition-fast);
}

.principle-card:hover {
  border-color: var(--border-gold);
  transform: translateY(-3px);
  background: rgba(212, 175, 55, 0.03);
}

.principle-title {
  font-family: var(--font-jp);
  font-size: 1.3rem;
  color: var(--gold);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.principle-kanji {
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.2);
}

.principle-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Footer */
.dojo-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  background: rgba(10, 10, 14, 0.9);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer-kanji {
  font-family: var(--font-jp);
  font-size: 1.8rem;
  color: rgba(211, 47, 47, 0.5);
  letter-spacing: 4px;
}