/* 
  Illusionary Core Design System & Styling
  Modern Glassmorphism, Dark/Light Theming, Micro-animations
*/

:root {
  /* Dark Theme (Default) */
  --bg-gradient: radial-gradient(circle at 50% 0%, #17192a 0%, #0b0c14 100%);
  --bg-primary: #0b0c14;
  --bg-surface: rgba(23, 26, 45, 0.7);
  --bg-surface-hover: rgba(35, 40, 68, 0.85);
  --bg-card: rgba(20, 23, 40, 0.65);
  --border-color: rgba(255, 255, 255, 0.12);
  --border-color-glow: rgba(99, 102, 241, 0.5);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #6366f1; /* Indigo */
  --accent-secondary: #06b6d4; /* Cyan */
  --accent-purple: #8b5cf6; /* Violet */
  --accent-pink: #ec4899; /* Pink */
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
  --accent-glow: 0 0 25px rgba(99, 102, 241, 0.35);

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.5);
  
  --backdrop-blur: blur(16px);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;

  --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-gradient: radial-gradient(circle at 50% 0%, #f1f5f9 0%, #e2e8f0 100%);
  --bg-primary: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.85);
  --bg-surface-hover: rgba(255, 255, 255, 0.98);
  --bg-card: rgba(255, 255, 255, 0.75);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-glow: rgba(99, 102, 241, 0.4);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
}

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

body {
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header & Nav */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-surface);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  transition: var(--transition-normal);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--accent-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-fast);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: rgba(99, 102, 241, 0.1);
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem;
  border-radius: 50%;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--accent-primary);
  transform: rotate(15deg);
}

/* Layout Containers */
.main-wrapper {
  flex: 1;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 2rem;
}

/* Hero Section */
.hero-section {
  text-align: center;
  padding: 3rem 1rem 4rem 1rem;
  position: relative;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 2.5rem auto;
}

/* Search & Filter Bar */
.filter-bar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.search-box {
  position: relative;
  max-width: 540px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.search-input {
  width: 100%;
  padding: 1rem 3rem 1rem 3rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1rem;
  backdrop-filter: var(--backdrop-blur);
  transition: var(--transition-normal);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: var(--accent-glow);
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-clear-btn {
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition: var(--transition-fast);
  padding: 0;
}

.search-clear-btn:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-50%) scale(1.1);
}

.category-tabs {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none;
}

.tab-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.tab-btn.active {
  background: var(--accent-gradient);
  color: white;
  border-color: transparent;
  box-shadow: var(--accent-glow);
}

/* Illusion Cards Grid */
.illusions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-color-glow);
  box-shadow: var(--shadow-lg), var(--accent-glow);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.badge {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-geometric { background: rgba(99, 102, 241, 0.2); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.4); }
.badge-physiological { background: rgba(236, 72, 153, 0.2); color: #f472b6; border: 1px solid rgba(236, 72, 153, 0.4); }
.badge-cognitive { background: rgba(139, 92, 246, 0.2); color: #c084fc; border: 1px solid rgba(139, 92, 246, 0.4); }
.badge-motion { background: rgba(6, 182, 212, 0.2); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.4); }

.card-preview-box {
  width: 100%;
  height: 220px;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.card-description {
  color: var(--text-secondary);
  font-size: 0.925rem;
  margin-bottom: 1.5rem;
  flex: 1;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--accent-glow);
}

.btn-primary:hover {
  opacity: 0.95;
  transform: scale(1.02);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--accent-primary);
}

.btn-like {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-fast);
}

.btn-like:hover, .btn-like.liked {
  color: #ef4444;
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}

/* Illusion Detail View Layout */
.detail-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .detail-layout {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .viewport-card {
    position: sticky;
    top: 54px;
    z-index: 90;
    padding: 1rem;
    gap: 0.75rem;
    box-shadow: var(--shadow-lg);
  }

  .illusion-stage {
    min-height: 230px;
    height: 230px;
  }

  .stage-toolbar {
    gap: 0.5rem;
  }

  .stage-toolbar .btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.825rem;
  }

  .control-panel {
    padding: 1rem;
    gap: 1rem;
  }

  .control-group {
    margin-bottom: 0.75rem !important;
  }
}

.viewport-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  backdrop-filter: var(--backdrop-blur);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.illusion-stage {
  width: 100%;
  min-height: 480px;
  background: #000;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

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

.control-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  backdrop-filter: var(--backdrop-blur);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-label {
  display: flex;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

/* Form Slider Styling */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-surface);
  border-radius: 3px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  box-shadow: var(--accent-glow);
  transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Scientific Explanation Section */
.info-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  margin-top: 2rem;
  backdrop-filter: var(--backdrop-blur);
}

.info-section h3 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.mechanism-box {
  background: rgba(99, 102, 241, 0.1);
  border-left: 4px solid var(--accent-primary);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1.25rem;
  font-weight: 600;
  color: var(--accent-primary);
}

/* Legal Modals & Footer */
.legal-footer {
  margin-top: auto;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.legal-footer a {
  color: var(--text-secondary);
  text-decoration: underline;
  margin: 0 0.5rem;
  transition: var(--transition-fast);
}

.legal-footer a:hover {
  color: var(--accent-primary);
}

/* Custom Legal Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 99999;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-content {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  max-width: 620px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.25rem;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.75rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-primary);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero-title { font-size: 2.25rem; }
  .illusions-grid { grid-template-columns: 1fr; }
  .navbar { padding: 0.75rem 1rem; }
  .main-wrapper { padding: 1.5rem 1rem; }

  .brand-logo {
    font-size: 1.2rem;
    gap: 0.5rem;
  }

  .brand-icon {
    width: 30px;
    height: 30px;
    font-size: 0.9rem;
    border-radius: 8px;
  }

  .nav-links {
    gap: 0.5rem;
  }

  .nav-link {
    font-size: 0.85rem;
    padding: 0.35rem 0.5rem;
  }

  .theme-toggle {
    width: 34px;
    height: 34px;
    padding: 0.35rem;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: 0.6rem 0.75rem;
  }

  .nav-container {
    gap: 0.5rem;
  }

  .brand-logo {
    font-size: 1.05rem;
    gap: 0.35rem;
  }

  .brand-icon {
    width: 26px;
    height: 26px;
    font-size: 0.8rem;
  }

  .nav-links {
    gap: 0.25rem;
  }

  .nav-link {
    font-size: 0.775rem;
    padding: 0.3rem 0.4rem;
  }

  .theme-toggle {
    width: 30px;
    height: 30px;
    font-size: 0.85rem;
  }

  .viewport-card {
    top: 46px;
    padding: 0.75rem;
  }

  .illusion-stage {
    min-height: 190px;
    height: 190px;
  }

  .control-panel {
    padding: 0.85rem;
  }

  .control-label {
    font-size: 0.825rem;
  }
}

@media (max-width: 360px) {
  .domain-suffix {
    display: none;
  }
}

/* Submission Form Styling & Responsive Mobile Grid */
.submission-form-grid {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.form-input-text, .form-textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition-fast);
  box-sizing: border-box;
}

.form-textarea {
  min-height: 90px;
  resize: vertical;
}

.form-input-text:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: var(--accent-glow);
}

.submission-action-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .submission-form-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .form-input-text, .form-textarea {
    font-size: 0.9rem;
    padding: 0.75rem 0.85rem;
  }

  .form-textarea {
    min-height: 80px;
  }
}