/* ==========================================================================
   IBCBS Interactive Learning Hub - Design System & Modern UI Stylesheet
   Modul: International Business, Chinese Business & Sustainability
   Dozentin: Prof. Dr. Stephanie Schrage (CAU Kiel)
   ========================================================================== */

:root {
  /* Color Palette (Deep Academic Navy & Radiant Accents) */
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: #38bdf8;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --primary: #0284c7;
  --primary-glow: rgba(2, 132, 199, 0.25);
  --accent-cyan: #38bdf8;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;

  /* Leitner Box Colors */
  --box-1: #ef4444; /* Rot - Neu / Ungelernt */
  --box-2: #f59e0b; /* Gelb - Vertraut */
  --box-3: #10b981; /* Grün - Gemeistert */

  /* Typography & Layout */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 30px var(--primary-glow);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(241, 245, 249, 0.95);
  --bg-glass: rgba(0, 0, 0, 0.02);
  --border-subtle: #e2e8f0;
  --border-focus: #0284c7;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  
  --primary: #0284c7;
  --primary-glow: rgba(2, 132, 199, 0.15);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(2, 132, 199, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(99, 102, 241, 0.07) 0%, transparent 45%);
  background-attachment: fixed;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-dim);
}

/* Main Container */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem 1.25rem;
  width: 100%;
  flex: 1;
}

/* Header & Meta Bar */
header.app-header {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1.5rem;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: rgba(2, 132, 199, 0.15);
  color: var(--accent-cyan);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.brand-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-top: 0.4rem;
}
[data-theme="light"] .brand-title {
  background: linear-gradient(135deg, #0f172a 30%, #0369a1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.header-meta-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.meta-pill {
  font-size: 0.8rem;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.meta-pill.highlight {
  border-color: rgba(245, 158, 11, 0.4);
  color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.1);
}

.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}
.theme-toggle-btn:hover {
  border-color: var(--primary);
  background: var(--bg-card-hover);
}

/* Tab Navigation */
nav.app-nav {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-secondary);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  margin-bottom: 2rem;
  position: sticky;
  top: 1rem;
  z-index: 100;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
}

.nav-tab-btn {
  flex: 1;
  min-width: 140px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.nav-tab-btn:hover {
  color: var(--text-main);
  background: var(--bg-glass);
}

.nav-tab-btn.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--primary-glow);
}

.nav-tab-btn .shortcut-key {
  font-size: 0.7rem;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.25);
  opacity: 0.8;
  font-family: var(--font-mono);
}

/* View Sections */
.view-section {
  display: none;
  animation: fadeIn 0.3s ease-in-out;
}
.view-section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   VIEW 1: DASHBOARD & RADAR
   ========================================================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
}

.stat-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.stat-sub {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Acts Progress Breakdown */
.acts-breakdown-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 2rem;
}

.acts-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.act-progress-row {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.act-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
}

.act-name {
  color: var(--text-main);
}
.act-stats {
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.progress-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 9999px;
  overflow: hidden;
  display: flex;
}

.progress-fill-mastered {
  background: var(--box-3);
  height: 100%;
  transition: width 0.4s ease;
}
.progress-fill-familiar {
  background: var(--box-2);
  height: 100%;
  transition: width 0.4s ease;
}

/* Leitner Box Grid */
.leitner-box-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.leitner-box-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: var(--transition);
}

.leitner-box-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
}

.leitner-box-card.box-1 { border-top: 3px solid var(--box-1); }
.leitner-box-card.box-2 { border-top: 3px solid var(--box-2); }
.leitner-box-card.box-3 { border-top: 3px solid var(--box-3); }

.box-count {
  font-size: 1.8rem;
  font-weight: 800;
}
.box-1 .box-count { color: var(--box-1); }
.box-2 .box-count { color: var(--box-2); }
.box-3 .box-count { color: var(--box-3); }

.box-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Dashboard Actions */
.dashboard-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--primary-glow);
}
.btn-primary:hover {
  background: #0369a1;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-dim);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
}

/* ==========================================================================
   VIEW 2: 3D INTERACTIVE FLASHCARDS
   ========================================================================== */
.flashcards-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
}

/* Filter Controls */
.filter-bar {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.filter-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.act-pills {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-pill {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  border-radius: 9999px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-pill:hover {
  color: var(--text-main);
  background: var(--bg-card-hover);
}

.filter-pill.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.search-box {
  position: relative;
  min-width: 250px;
}

.search-input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-size: 0.85rem;
  padding: 0.5rem 1rem 0.5rem 2.2rem;
  border-radius: var(--radius-sm);
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--border-focus);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* 3D Flip Card Scene */
.card-stage {
  width: 100%;
  max-width: 780px;
  perspective: 1200px;
  margin: 1rem 0;
}

.flashcard-3d {
  width: 100%;
  min-height: 420px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.flashcard-3d.is-flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
}

.card-face:hover {
  border-color: rgba(56, 189, 248, 0.3);
}

/* Front Face */
.card-face-front {
  background: linear-gradient(145deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.9));
}

/* Back Face */
.card-face-back {
  transform: rotateY(180deg);
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.95), rgba(2, 44, 34, 0.3));
  border-color: rgba(16, 185, 129, 0.25);
  overflow-y: auto;
}

.card-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  margin-bottom: 1.25rem;
}

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

.tag-act {
  background: rgba(2, 132, 199, 0.2);
  color: var(--accent-cyan);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.75rem;
}

.tag-prio {
  background: rgba(245, 158, 11, 0.2);
  color: var(--accent-amber);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.75rem;
}

.card-box-indicator {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.05);
}

.card-box-indicator.b-1 { color: var(--box-1); border: 1px solid rgba(239, 68, 68, 0.3); }
.card-box-indicator.b-2 { color: var(--box-2); border: 1px solid rgba(245, 158, 11, 0.3); }
.card-box-indicator.b-3 { color: var(--box-3); border: 1px solid rgba(16, 185, 129, 0.3); }

.card-author {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-indigo);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.card-question {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-main);
  margin-bottom: 1.5rem;
}

.card-flip-prompt {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border-subtle);
}

/* Card Back Content */
.card-answer-text {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text-main);
  white-space: pre-line;
  margin-bottom: 1.25rem;
}

.keyword-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.signalword-tag {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.card-deep-section {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  margin-bottom: 0.75rem;
  border-left: 3.5px solid var(--accent-amber);
  font-size: 0.85rem;
}
.card-deep-section.trap {
  border-left-color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.08);
}

.deep-label {
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
  color: var(--accent-amber);
}
.trap .deep-label {
  color: var(--accent-rose);
}

/* Card Navigation & Controls */
.card-controls {
  width: 100%;
  max-width: 780px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.card-nav-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-round {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
}
.btn-round:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
}

.card-counter-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.btn-answer-again {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fca5a5;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.btn-answer-again:hover {
  background: rgba(239, 68, 68, 0.25);
  transform: translateY(-1px);
}

.btn-answer-know {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #6ee7b7;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.btn-answer-know:hover {
  background: rgba(16, 185, 129, 0.25);
  transform: translateY(-1px);
}

/* Keyboard Hints Bar */
.keyboard-hints {
  display: flex;
  gap: 1.25rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}
.kbd {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  color: var(--text-main);
}

/* ==========================================================================
   VIEW 3: SCHRAGE FALLSTUDIEN-DRILL
   ========================================================================== */
.cases-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.case-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
}

.case-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
}

.case-company-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-top: 0.25rem;
}

.case-scenario-box {
  background: rgba(0, 0, 0, 0.2);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  font-size: 0.95rem;
  line-height: 1.6;
}

.case-question-box {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.case-question-title {
  font-weight: 700;
  color: var(--accent-amber);
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
  text-transform: uppercase;
}

.case-textarea {
  width: 100%;
  min-height: 120px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-main);
  padding: 1rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
}
.case-textarea:focus {
  border-color: var(--border-focus);
}

.case-solution-panel {
  display: none;
  background: rgba(16, 185, 129, 0.06);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  animation: fadeIn 0.3s ease;
}
.case-solution-panel.revealed {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.criteria-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 0.75rem;
}

.criteria-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  background: rgba(0, 0, 0, 0.2);
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  user-select: none;
}
.criteria-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-emerald);
  cursor: pointer;
}

/* ==========================================================================
   VIEW 4: SPICKZETTEL & SIGNALWORT-EXPLORER
   ========================================================================== */
.spickzettel-section {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.authors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.author-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.75rem;
  transition: var(--transition);
}
.author-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.author-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.author-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}
.author-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.author-concept {
  font-weight: 600;
  color: var(--accent-indigo);
  font-size: 0.9rem;
}

.author-paper {
  font-style: italic;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.author-thesis {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-muted);
}

/* Data Tables */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

table.data-table th, table.data-table td {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--border-subtle);
}

table.data-table th {
  background: rgba(0, 0, 0, 0.25);
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

table.data-table tr:hover {
  background: var(--bg-card-hover);
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #0f172a;
  color: #38bdf8;
  border: 1px solid #38bdf8;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  font-weight: 600;
  font-size: 0.85rem;
  z-index: 1000;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .brand-title {
    font-size: 1.35rem;
  }
  .leitner-box-grid {
    grid-template-columns: 1fr;
  }
  .card-face {
    padding: 1.25rem;
  }
  .card-question {
    font-size: 1.15rem;
  }
  .card-controls {
    flex-wrap: wrap;
    justify-content: center;
  }
}