:root {
  --bg-main: #0B1120;
  --bg-card: #1e293b;
  --bg-card-hover: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --accent-color: #6366f1;
  --accent-hover: #4f46e5;
  --instruction-bg: rgba(99, 102, 241, 0.08);
  --font-main: 'Inter', sans-serif;
  --font-mono: 'Fira Code', monospace;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.6;
  background-image: 
    radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), 
    radial-gradient(at 50% 0%, hsla(225,39%,30%,0.15) 0, transparent 50%), 
    radial-gradient(at 100% 0%, hsla(339,49%,30%,0.1) 0, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  flex-grow: 1;
  width: 100%;
}

/* Header */
.hero {
  text-align: center;
  margin-bottom: 3rem;
  padding-top: 2rem;
}

.hero .logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 700;
  background: linear-gradient(to right, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* Instructions Card */
.instructions-card {
  background-color: var(--instruction-bg);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 12px;
  padding: 1.75rem 2.25rem;
  margin-bottom: 3rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.instructions-card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #a78bfa;
}

.instructions-card ol {
  margin-left: 1.5rem;
  margin-top: 1rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.instructions-card code.code {
  font-family: var(--font-mono);
  background: rgba(0,0,0,0.3);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  color: #fbbf24;
}

.instruction-note {
  margin-top: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Controls (Search & Filter) */
.controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.search-wrapper, .filter-wrapper {
  position: relative;
  flex: 1;
  min-width: 250px;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  pointer-events: none;
}

input[type="text"], select {
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 2.5rem;
  background-color: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 1rem;
  transition: all 0.2s ease;
}

select {
  padding-left: 1rem;
  appearance: none;
  background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2394a3b8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
  background-repeat: no-repeat;
  background-position: right 1rem top 50%;
  background-size: 0.65rem auto;
  cursor: pointer;
}

input[type="text"]:focus, select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

/* Quotes Grid */
.quotes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.quote-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.quote-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
  border-color: #475569;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.category-badge {
  background-color: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.class-badge {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-size: 0.85rem;
  background-color: rgba(0, 0, 0, 0.25);
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.05);
}

.card-body {
  flex-grow: 1;
  margin-bottom: 1.5rem;
}

.quote-text {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
}

.quote-text::before {
  content: '"';
  color: var(--accent-color);
  opacity: 0.7;
}

.quote-text::after {
  content: '"';
  color: var(--accent-color);
  opacity: 0.7;
}

.card-footer {
  text-align: right;
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 1rem;
}

.student-name {
  font-weight: 600;
  color: #cbd5e1;
}

/* Empty / Error States */
.empty-state, .error-state {
  text-align: center;
  padding: 4rem 2rem;
  background-color: rgba(30, 41, 59, 0.4);
  border-radius: 12px;
  border: 1px dashed var(--border-color);
  margin-top: 2rem;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hidden {
  display: none !important;
}

/* Footer */
footer {
  text-align: center;
  padding: 2.5rem 2rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Contribution Options */
.instructions-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contribution-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1rem;
}

.option h3 {
  font-size: 1rem;
  color: #a78bfa;
  margin-bottom: 0.5rem;
}

.option p, .option li {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Buttons */
.primary-btn {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.4);
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.4);
}

.submit-btn {
  width: 100%;
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 0.875rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 1rem;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.75);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal-content {
  background-color: var(--bg-card);
  width: 90%;
  max-width: 500px;
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  position: relative;
  animation: modalAppear 0.3s ease-out;
}

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

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-group input, .form-group textarea {
  width: 100%;
  padding: 0.75rem;
  background-color: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: inherit;
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.random-quote {
  background-color: var(--instruction-bg);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 12px;
  padding: 1.75rem 2.25rem;
  margin-bottom: 3rem;
  text-align: center;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.random-quote h2 {
  margin-top: 0;
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: #a78bfa;
}

.quote-card-featured {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  text-align: left;
}

.quote-card-featured blockquote {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
  margin: 0 0 1rem 0;
}

.quote-card-featured blockquote::before {
  content: '"';
  color: var(--accent-color);
  opacity: 0.7;
}

.quote-card-featured blockquote::after {
  content: '"';
  color: var(--accent-color);
  opacity: 0.7;
}

.quote-author {
  text-align: right;
  font-weight: 600;
  color: #cbd5e1;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1rem;
  margin: 0;
}

.secondary-btn {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.4);
  transition: transform 0.2s, box-shadow 0.2s;
}

.secondary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.4);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }
  .controls {
    flex-direction: column;
  }
  .search-wrapper, .filter-wrapper {
    min-width: 100%;
  }
  .instructions-card {
    padding: 1.5rem;
  }
  .container {
    padding: 1.5rem;
  }
  .contribution-options {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .instructions-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .primary-btn {
    width: 100%;
  }
}