:root {
  --primary: #22c55e;
  --primary-dark: #16a34a;
  --accent: #06b6d4;
  --bg: #0a0a0a;
  --bg-elevated: #111111;
  --bg-card: #141414;
  --border: #222222;
  --text: #e5e5e5;
  --text-muted: #737373;
  --text-dim: #525252;
  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #22c55e;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.container-wide {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
}

.hero-brand {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.hero-brand a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.hero-brand a:hover {
  color: var(--primary);
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  line-height: 1.15;
}

.hero-sub {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto;
}

.hero-tags {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tag-primary {
  border-color: var(--primary);
  color: var(--primary);
}

.tag-accent {
  border-color: var(--accent);
  color: var(--accent);
}

/* Sections */
.section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

/* Compensation */
.compensation-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
}

.compensation-amount {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.compensation-note {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.compensation-bonus {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.4rem 1rem;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 500;
}

/* What You'll Learn */
.learn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.learn-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
}

.learn-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.learn-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.learn-tech {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* Form */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

input, select, textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

input::placeholder, textarea::placeholder {
  color: var(--text-dim);
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%23737373' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: #000;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.alert {
  padding: 0.85rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.alert-success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  color: var(--success);
}

/* Encouragement */
.encourage {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: rgba(6, 182, 212, 0.06);
  border: 1px solid rgba(6, 182, 212, 0.15);
  border-radius: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.encourage strong {
  color: var(--accent);
}

/* Math challenge */
.math-challenge {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.math-challenge label {
  margin-bottom: 0;
  font-size: 0.9rem;
  color: var(--text);
}

.math-challenge input {
  width: 100px;
  margin: 0;
}

/* Timer */
.timer {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg-card);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Question blocks */
.question-block {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.question-block h4 {
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text);
}

.options label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  cursor: pointer;
  background: var(--bg-card);
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.options label:hover {
  border-color: var(--primary);
}

.options input {
  width: auto;
  accent-color: var(--primary);
}

/* Honeypot */
.honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
}

/* Admin */
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { text-align: left; padding: 0.65rem 0.5rem; border-bottom: 1px solid var(--border); }
th { font-size: 0.75rem; text-transform: uppercase; color: var(--text-dim); letter-spacing: 0.05em; font-weight: 600; }
tr:hover { background: var(--bg-elevated); }

.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-pending { background: rgba(245, 158, 11, 0.1); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.2); }
.badge-eligible { background: rgba(6, 182, 212, 0.1); color: var(--accent); border: 1px solid rgba(6, 182, 212, 0.2); }
.badge-test_started { background: rgba(139, 92, 246, 0.1); color: #a78bfa; border: 1px solid rgba(139, 92, 246, 0.2); }
.badge-test_completed { background: rgba(34, 197, 94, 0.1); color: var(--success); border: 1px solid rgba(34, 197, 94, 0.2); }
.badge-shortlisted { background: rgba(99, 102, 241, 0.1); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.2); }
.badge-rejected { background: rgba(239, 68, 68, 0.1); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.2); }

.nav { display: flex; gap: 1rem; align-items: center; padding: 1rem 0; border-bottom: 1px solid var(--border); margin-bottom: 1.5rem; flex-wrap: wrap; }
.nav a { color: var(--text-dim); text-decoration: none; font-weight: 600; font-size: 0.85rem; }
.nav a:hover, .nav a.active { color: var(--primary); }
.nav .brand { font-size: 1rem; color: var(--text); margin-right: auto; font-weight: 700; }
.nav .user { font-size: 0.8rem; color: var(--text-dim); margin-left: auto; }

@media (max-width: 640px) {
  .container { padding: 1rem; }
  .hero h1 { font-size: 1.75rem; }
  .compensation-amount { font-size: 1.75rem; }
  .learn-grid { grid-template-columns: 1fr; }
  .math-challenge { flex-direction: column; align-items: flex-start; }
  .math-challenge input { width: 100%; }
}