:root {
  /* Dark Mode Palette */
  --bg: #0b0f17;
  --bg-dots: #1e293b;
  --card: rgba(30, 41, 59, 0.65);
  --card-border: rgba(255, 255, 255, 0.08);
  --ink: #f1f5f9;
  --muted: #94a3b8;
  --blue: #3b82f6;
  --blue-glow: rgba(59, 130, 246, 0.5);
  --cyan: #06b6d4;
  --orange: #f59e0b;
  --ok: #10b981;
  --bad: #ef4444;
  --line: rgba(255, 255, 255, 0.1);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  --glass-blur: blur(16px);
}

.status-correct { color: #10b981 !important; font-weight: 700; }
.status-incorrect { color: #f43f5e !important; font-weight: 700; }

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  color: var(--ink);
  background: var(--bg);
  background-image: 
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.1) 0px, transparent 50%),
    radial-gradient(circle at 50% 50%, var(--bg-dots) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 30px 30px;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Glassmorphism Background Shapes */
.bg-shape {
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.25;
}

.shape-1 {
  width: 400px;
  height: 400px;
  background: var(--blue);
  top: -150px;
  left: -100px;
}

.shape-2 {
  width: 350px;
  height: 350px;
  background: var(--cyan);
  right: -100px;
  bottom: -100px;
}

.hero {
  text-align: center;
  padding: 3.5rem 1rem 1.5rem;
}

.hero h1 {
  font-family: "Space Grotesk", sans-serif;
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  background: linear-gradient(135deg, #fff 30%, var(--blue) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.container {
  width: min(1000px, 94%);
  margin: 0 auto 3rem;
  display: grid;
  gap: 1.5rem;
}

.card {
  background: var(--card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  animation: rise 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

h2, h3 {
  font-family: "Space Grotesk", sans-serif;
  margin-top: 0;
  letter-spacing: -0.01em;
}

/* Form Styles */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

label {
  display: grid;
  gap: 0.6rem;
  font-weight: 600;
  color: var(--ink);
}

.label-text {
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.6rem;
}

input,
select,
button {
  font-family: inherit;
}

input,
select {
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 0.8rem 1rem;
  background: rgba(15, 23, 42, 0.6);
  color: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

/* Language Selector (Cards) */
.lang-selector-container {
  grid-column: 1 / -1;
}

.language-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.lang-card {
  background: rgba(15, 23, 42, 0.4);
  border: 1.5px solid var(--card-border);
  border-radius: 18px;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
}

.lang-card:hover {
  transform: translateY(-4px);
  border-color: var(--blue);
  background: rgba(15, 23, 42, 0.6);
}

.lang-card.active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(6, 182, 212, 0.1));
  border-color: var(--blue);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.lang-icon {
  font-size: 2.8rem;
  margin-bottom: 0.8rem;
  transition: transform 0.3s ease;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Colors for Font Awesome Icons */
.fa-html5 { color: #e34f26; }
.fa-css3-alt { color: #1572b6; }
.fa-js { color: #f7df1e; }
.fa-java { color: #007396; }
.fa-python { color: #3776ab; }

.lang-card:hover .lang-icon {
  transform: scale(1.1);
}

.lang-name {
  font-weight: 700;
  font-size: 0.95rem;
}

/* Buttons */
.btn {
  border: 0;
  border-radius: 14px;
  padding: 0.8rem 1.4rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.3);
}

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

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue), #1d4ed8);
  color: #fff;
  box-shadow: 0 4px 14px var(--blue-glow);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px var(--blue-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--card-border);
  color: #fff;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

#submit-btn {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
}

.btn-success {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.btn-outline-danger {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.btn-outline-danger:hover {
  background: #ef4444;
  color: #fff;
  box-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
}

.result-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

/* Quiz UI Components */
.quiz-top {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.timer-box {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 0.6rem 1rem;
  text-align: right;
  min-width: 120px;
}

.timer-box span {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05rem;
}

.timer-box strong {
  font-size: 1.2rem;
  font-family: 'Space Grotesk', monospace;
  color: var(--blue);
}

.progress-wrap {
  width: 100%;
  background: rgba(15, 23, 42, 0.8);
  border-radius: 999px;
  margin: 1.5rem 0;
  height: 10px;
  overflow: hidden;
  border: 1px solid var(--card-border);
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  box-shadow: 0 0 10px var(--blue-glow);
  transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.question-card {
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 1.5rem;
  background: rgba(15, 23, 42, 0.3);
  margin-bottom: 1.5rem;
}

#question-text {
  margin-top: 0;
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.4;
  margin-bottom: 1.5rem;
}

.choices {
  display: grid;
  gap: 0.8rem;
}

.choice {
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 16px;
  padding: 1rem 1.2rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--ink);
  font-size: 1rem;
}

.choice:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--blue);
  transform: translateX(4px);
}

.choice.selected {
  border-color: var(--blue);
  background: rgba(59, 130, 246, 0.15);
  box-shadow: inset 0 0 0 1px var(--blue);
}

.choice.correct {
  border-color: var(--ok);
  background: rgba(16, 185, 129, 0.15);
  box-shadow: inset 0 0 0 1px var(--ok);
}

.choice.wrong {
  border-color: var(--bad);
  background: rgba(239, 68, 68, 0.15);
  box-shadow: inset 0 0 0 1px var(--bad);
}

.feedback {
  margin-top: 1.2rem;
  border-radius: 18px;
  padding: 1.2rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed var(--card-border);
  font-size: 0.95rem;
}

.feedback strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.feedback.ok {
  border-color: var(--ok);
  color: #d1fae5;
}

.feedback.bad {
  border-color: var(--bad);
  color: #fee2e2;
}

.quiz-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Results & History */
.score-box {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(245, 158, 11, 0.05));
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 1.5rem;
  font-size: 1.1rem;
  text-align: center;
  margin-bottom: 2rem;
}

.score-box b {
  color: var(--blue);
  font-size: 1.5rem;
}

.summary {
  margin: 1.5rem 0;
  text-align: center;
  color: var(--muted);
}

.corrections {
  display: grid;
  gap: 1rem;
  margin: 2rem 0;
}

.correction-item {
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.02);
  border-radius: 18px;
  padding: 1.2rem;
}

.correction-item strong {
  color: var(--ink);
  font-size: 1.05rem;
}

.history-item {
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.02);
  margin-bottom: 0.8rem;
}

.history-item.newest {
  border-color: var(--blue);
  background: rgba(59, 130, 246, 0.05);
}

.history-item strong {
  color: var(--blue);
}

.hidden {
  display: none !important;
}

.loader-mini {
  color: var(--muted);
  font-style: italic;
  padding: 1rem;
}

/* Responsive */
@media (max-width: 680px) {
  .hero {
    padding-top: 2rem;
  }
  
  .quiz-top {
    flex-direction: column-reverse;
    align-items: stretch;
  }
  
  .timer-box {
    text-align: center;
  }
  
  .language-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- Evolution Premium --- */
.progress-container {
  width: calc(100% + 40px);
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  margin: -20px -20px 20px -20px;
  border-radius: 12px 12px 0 0;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #6366f1, #a855f7);
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.result-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 15px;
  margin: 20px 0;
}

.stat-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 15px;
  border-radius: 16px;
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: #94a3b8;
  margin-bottom: 5px;
}

.stat-card strong {
  font-size: 1.4rem;
  color: #fff;
}

#record-badge-container {
  border-color: #f59e0b !important;
  background: rgba(245, 158, 11, 0.1) !important;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.2);
}

/* Prism code blocks UI */
pre[class*="language-"] {
  border-radius: 12px !important;
  margin: 15px 0 !important;
  background: #111827 !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
}
code[class*="language-"] {
  text-shadow: none !important;
}