/* ====== CSS Custom Properties ====== */
:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --accent-color: #f59e0b;
  --background-color: #f8fafc;
  --text-color: #1f2937;
  --border-color: #d1d5db;
  --success-color: #10b981;
  --focus-color: #3b82f6;
  --radius: 6px;
}

/* ====== Reset and Base Styles ====== */
* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ====== Header Styles ====== */
.site-header {
  background: white;
  border-bottom: 3px solid var(--primary-color);
  padding: 1.5rem 2rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.site-header h1 {
  margin: 0 0 0.5rem 0;
  color: var(--primary-color);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
}

.sub {
  margin: 0 0 1rem 0;
  color: #6b7280;
  font-size: 1.1rem;
}

/* ====== Progress Bar ====== */
#progress-container {
  width: 100%;
  height: 8px;
  background-color: #e5e7eb;
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 1rem;
}

#progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  width: 0%;
  transition: width 0.4s ease;
}

/* ====== Timer Styles ====== */
#timer-container {
  background: white;
  border: 2px solid var(--primary-color);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#timer-display {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

#timer-bar-container {
  width: 100%;
  height: 12px;
  background-color: #e5e7eb;
  border-radius: var(--radius);
  overflow: hidden;
}

#timer-bar {
  height: 100%;
  background-color: var(--success-color);
  border-radius: var(--radius);
  transition: width 0.5s ease, background-color 0.3s ease;
}

/* ====== Main Container ====== */
#container {
  flex: 1;
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
  width: 100%;
}

/* ====== Typography ====== */
h1, h2, h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.875rem;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: 1.25rem;
  color: var(--text-color);
}

p {
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

/* ====== Form Styles ====== */
form {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin-bottom: 2rem;
}

label {
  display: block;
  margin-bottom: 1.5rem;
  font-weight: 600;
  color: var(--text-color);
}

input, select, textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 1rem;
  margin-top: 0.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--focus-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ====== Button Styles ====== */
button {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

button:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

button:focus {
  outline: 3px solid var(--focus-color);
  outline-offset: 2px;
}

button:disabled {
  background: #9ca3af;
  cursor: not-allowed;
  transform: none;
}

/* ====== Text Display Styles ====== */
.text-container {
  background: white;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.text-type {
  color: var(--accent-color);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.text-content {
  font-size: 1.1rem;
  line-height: 1.8;
  text-align: justify;
}

/* ====== Question Styles ====== */
.question-item {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: #f8fafc;
  border-radius: var(--radius);
  border-left: 4px solid var(--primary-color);
}

.question-item label {
  margin-bottom: 0.5rem;
  font-weight: 500;
}

textarea {
  resize: vertical;
  min-height: 100px;
  font-family: inherit;
}

/* ====== Completion Message Styles ====== */
.completion-message {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  padding: 2rem;
}

.participant-code {
  background: #f0f9ff;
  border: 2px solid var(--primary-color);
  border-radius: var(--radius);
  padding: 1rem;
  margin: 1.5rem 0;
}

.participant-code span {
  font-family: 'Courier New', monospace;
  font-size: 1.2em;
  color: var(--primary-color);
}

#submission-status {
  margin-top: 2rem;
  padding: 1rem;
  background: #fafafa;
  border-radius: var(--radius);
}

.spinner {
  border: 3px solid #f3f3f3;
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  animation: spin 1s linear infinite;
  margin: 1rem auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ====== Footer ====== */
footer {
  text-align: center;
  padding: 1rem;
  color: #6b7280;
  border-top: 1px solid var(--border-color);
  background: white;
}

/* ====== Responsive Design ====== */
@media (max-width: 768px) {
  .site-header {
      padding: 1rem;
  }
  
  #container {
      margin: 1rem auto;
      padding: 0 0.5rem;
  }
  
  form {
      padding: 1.5rem;
  }
  
  .text-container {
      padding: 1.5rem;
  }
  
  button {
      width: 100%;
      justify-content: center;
  }
  
  #timer-display {
      font-size: 1.1rem;
  }
}

/* ====== Accessibility ====== */
@media (prefers-reduced-motion: reduce) {
  * {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
  }
}

/* Focus indicators for keyboard navigation */
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus-color);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
      --primary-color: #000080;
      --text-color: #000000;
      --background-color: #ffffff;
      --border-color: #000000;
  }
}