@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Soft, calming palette */
  --bg-color: #F8FAFC;
  --text-main: #334155;
  --text-light: #64748B;
  
  --primary-soft: #E0E7FF; /* Soft Indigo */
  --primary-strong: #4F46E5;
  
  --secondary-soft: #E3F2FD; /* Soft Blue */
  --secondary-strong: #0284C7;
  
  --success-soft: #E8F5E9; /* Sage Green */
  --success-strong: #16A34A;
  
  --error-soft: #FEE2E2; /* Soft red */
  --error-strong: #DC2626;

  --card-bg: #FFFFFF;
  --border-color: #E2E8F0;
  
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  line-height: 1.6;
  padding: 20px;
}

/* Typography */
h1 {
  font-weight: 700;
  font-size: 24px;
  color: var(--text-main);
  margin-bottom: 8px;
}

p {
  color: var(--text-light);
  font-size: 14px;
}

/* Layout */
.container {
  background-color: var(--card-bg);
  width: 100%;
  max-width: 800px;
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: fadeIn 0.5s ease-out;
}

.login-container {
  max-width: 400px;
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-main);
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: 'Inter', sans-serif;
  color: var(--text-main);
  transition: all 0.3s ease;
  background-color: var(--bg-color);
}

input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: var(--primary-strong);
  box-shadow: 0 0 0 3px var(--primary-soft);
  background-color: var(--card-bg);
}

/* Buttons */
.btn {
  display: inline-block;
  width: 100%;
  padding: 14px 20px;
  background-color: var(--primary-strong);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.btn:hover {
  background-color: #4338CA;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  background-color: #E2E8F0;
}

/* Test Interface UI */
.header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.timer {
  background-color: var(--primary-soft);
  color: var(--primary-strong);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
}

/* Questions */
.question-card {
  margin-bottom: 30px;
  padding: 24px;
  background-color: var(--bg-color);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all 0.3s ease;
}

.question-card:hover {
  border-color: var(--primary-soft);
  box-shadow: var(--shadow-sm);
}

.question-text {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-main);
}

/* Options */
.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.option-label {
  display: flex;
  align-items: center;
  padding: 16px;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.option-label:hover {
  background-color: var(--secondary-soft);
  border-color: var(--secondary-strong);
}

.option-input {
  margin-right: 12px;
  accent-color: var(--primary-strong);
  width: 16px;
  height: 16px;
}

/* Results Interface */
.result-summary {
  text-align: center;
  padding: 30px;
  background-color: var(--secondary-soft);
  border-radius: var(--radius-md);
  margin-bottom: 40px;
}

.score-display {
  font-size: 48px;
  font-weight: 700;
  color: var(--secondary-strong);
  margin: 10px 0;
}

.stats-row {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 16px;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.stat-item.correct { color: var(--success-strong); }
.stat-item.incorrect { color: var(--error-strong); }

.review-section {
  margin-top: 30px;
}

.review-item {
  padding: 20px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  background-color: var(--bg-color);
  border-left: 4px solid var(--border-color);
}

.review-item.is-correct {
  background-color: var(--success-soft);
  border-left-color: var(--success-strong);
}

.review-item.is-incorrect {
  background-color: var(--error-soft);
  border-left-color: var(--error-strong);
}

.review-question {
  font-weight: 600;
  margin-bottom: 12px;
}

.review-detail {
  font-size: 14px;
  margin-top: 8px;
}

.correct-text { color: var(--success-strong); font-weight: 600; }
.incorrect-text { color: var(--error-strong); font-weight: 600; }

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.mb-4 { margin-bottom: 16px; }
.mt-4 { margin-top: 16px; }

/* Error message */
.error-message {
  color: var(--error-strong);
  background-color: var(--error-soft);
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 20px;
  text-align: center;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  .container {
    padding: 24px;
  }
}