@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #161620;
  --bg-input: #0f0f17;
  --border: #232333;
  --border-strong: #2e2e42;
  --text: #f5f5f7;
  --text-muted: #9999a8;
  --text-dim: #6b6b7a;
  --accent: #6366f1;
  --accent-2: #10b981;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #10b981 100%);
  --accent-soft: rgba(99, 102, 241, 0.12);
  --danger: #ef4444;
  --shadow-lg: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  --radius: 12px;
  --radius-lg: 18px;
}

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

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(16, 185, 129, 0.08), transparent 70%),
    var(--bg);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }
h1 { font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 800; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: 1.3rem; }
p { color: var(--text-muted); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 24px; }

/* === Nav === */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(20px);
  background: rgba(10, 10, 15, 0.7);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.1rem; }
.nav-brand img, .nav-brand svg { height: 32px; width: auto; display: block; }
.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a {
  color: var(--text-muted); font-size: 0.92rem; font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--text); }

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px; border-radius: var(--radius);
  font-family: inherit; font-weight: 600; font-size: 0.95rem;
  border: none; cursor: pointer; text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s, background 0.15s;
}
.btn-primary {
  background: var(--accent-gradient); color: white;
  box-shadow: 0 10px 30px -10px rgba(99, 102, 241, 0.5);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px -10px rgba(99, 102, 241, 0.6); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-secondary {
  background: var(--bg-elevated); color: var(--text);
  border: 1px solid var(--border-strong);
}
.btn-secondary:hover { background: var(--bg-card); border-color: var(--accent); }
.btn-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--border-strong); }
.btn-lg { padding: 18px 36px; font-size: 1.05rem; }
.btn-sm { padding: 8px 14px; font-size: 0.85rem; }
.btn-danger { background: transparent; color: #fca5a5; border: 1px solid rgba(239,68,68,0.3); }
.btn-danger:hover { background: rgba(239,68,68,0.1); }

/* === Hero === */
.hero { padding: 100px 0 80px; text-align: center; }
.hero-eyebrow {
  display: inline-block; padding: 6px 14px; border-radius: 100px;
  background: var(--accent-soft); border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc; font-size: 0.85rem; font-weight: 500; margin-bottom: 24px;
}
.hero h1 { margin-bottom: 20px; }
.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p.lead {
  font-size: 1.2rem; max-width: 640px; margin: 0 auto 36px; color: var(--text-muted);
}
.hero-ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* === Sections === */
section { padding: 80px 0; }
.section-eyebrow {
  text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.15em;
  color: var(--accent); font-weight: 600; margin-bottom: 12px;
}
.section-header { text-align: center; margin-bottom: 56px; }
.section-header p { max-width: 600px; margin: 16px auto 0; font-size: 1.05rem; }

/* === Grids === */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 880px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* === Cards === */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
  transition: transform 0.2s, border-color 0.2s;
}
.card:hover { transform: translateY(-3px); border-color: var(--border-strong); }
.card-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--accent-gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; margin-bottom: 18px; font-weight: 700; color: white;
}
.card h3 { margin-bottom: 10px; }
.card p { font-size: 0.95rem; }

/* === Pricing === */
.pricing {
  max-width: 480px; margin: 0 auto;
  background: var(--bg-card); border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg); padding: 40px;
  text-align: center; position: relative; overflow: hidden;
}
.pricing::before {
  content: ''; position: absolute; inset: 0;
  background: var(--accent-gradient); opacity: 0.06; z-index: 0;
}
.pricing > * { position: relative; z-index: 1; }
.pricing-badge {
  display: inline-block; padding: 4px 12px; border-radius: 100px;
  background: var(--accent-gradient); color: white;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; margin-bottom: 16px;
}
.pricing-price {
  font-size: 4.5rem; font-weight: 800; letter-spacing: -0.04em; margin: 12px 0;
}
.pricing-price sup { font-size: 1.5rem; vertical-align: top; line-height: 1.5; color: var(--text-muted); }
.pricing-features { text-align: left; margin: 24px 0 28px; }
.pricing-features li {
  list-style: none; padding: 8px 0 8px 28px; position: relative;
  color: var(--text); font-size: 0.95rem;
}
.pricing-features li::before {
  content: '✓'; position: absolute; left: 0; top: 8px;
  width: 18px; height: 18px;
  background: var(--accent-gradient); border-radius: 50%;
  color: white; font-size: 0.7rem; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}

/* === FAQ === */
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 12px; overflow: hidden;
}
.faq-q {
  padding: 20px 24px; font-weight: 600; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; user-select: none;
}
.faq-q::after {
  content: '+'; font-size: 1.4rem; font-weight: 300;
  color: var(--accent); transition: transform 0.2s;
}
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-muted); padding: 0 24px;
}
.faq-item.open .faq-a { max-height: 400px; padding: 0 24px 22px; }

/* === Steps === */
.steps { counter-reset: step; }
.step {
  display: flex; gap: 24px; padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: none; }
.step-num {
  width: 48px; height: 48px; min-width: 48px; border-radius: 50%;
  background: var(--accent-gradient);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: white; font-size: 1.1rem;
}
.step h3 { margin-bottom: 6px; }

/* === Forms === */
.form-wrap {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 40px;
}
.form-progress { display: flex; gap: 6px; margin-bottom: 36px; }
.form-progress-bar {
  flex: 1; height: 4px; background: var(--border);
  border-radius: 100px; overflow: hidden; position: relative;
}
.form-progress-bar.done { background: var(--accent-gradient); }
.form-progress-bar.active { background: var(--accent-gradient); opacity: 0.6; }

.step-panel { display: none; }
.step-panel.active { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.step-label {
  font-size: 0.78rem; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.15em;
  font-weight: 600; margin-bottom: 8px;
}
.step-title { font-size: 1.7rem; margin-bottom: 8px; font-weight: 700; }
.step-desc { color: var(--text-muted); margin-bottom: 28px; }

.field { margin-bottom: 22px; }
.field label {
  display: block; font-weight: 500; font-size: 0.92rem;
  margin-bottom: 8px; color: var(--text);
}
.field-hint { display: block; font-size: 0.82rem; color: var(--text-dim); margin-top: 4px; }
.field input[type="text"],
.field input[type="email"],
.field input[type="url"],
.field input[type="password"],
.field input[type="number"],
.field input[type="date"],
.field select,
.field textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 13px 16px;
  color: var(--text);
  font-family: inherit; font-size: 0.95rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field textarea { resize: vertical; min-height: 90px; line-height: 1.5; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .field-row { grid-template-columns: 1fr; } }

.checkbox-group, .radio-group {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 8px;
}
.check-pill {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius); cursor: pointer;
  font-size: 0.9rem; transition: all 0.15s;
}
.check-pill:hover { border-color: var(--border-strong); }
.check-pill input { accent-color: var(--accent); }
.check-pill.checked { border-color: var(--accent); background: var(--accent-soft); }

.form-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--border);
}

/* === Auth pages === */
.auth-wrap {
  max-width: 440px; margin: 80px auto;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 40px;
  box-shadow: var(--shadow-lg);
}
.auth-tabs {
  display: flex; background: var(--bg-input);
  border-radius: var(--radius); padding: 4px; margin-bottom: 28px;
}
.auth-tab {
  flex: 1; padding: 10px 16px; border-radius: 8px;
  text-align: center; cursor: pointer; font-weight: 600;
  font-size: 0.9rem; color: var(--text-muted);
  transition: all 0.15s;
}
.auth-tab.active { background: var(--bg-card); color: var(--text); box-shadow: 0 2px 6px rgba(0,0,0,0.2); }

/* === Loader === */
.loader { text-align: center; padding: 80px 24px; }
.spinner {
  width: 56px; height: 56px;
  border: 3px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; margin: 0 auto 24px;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loader-task {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 8px auto; max-width: 460px; text-align: left;
  font-size: 0.92rem; color: var(--text-muted); transition: all 0.2s;
}
.loader-task.active { border-color: var(--accent); color: var(--text); }
.loader-task.done { border-color: var(--accent-2); color: var(--text); }
.loader-task-status { font-size: 1.1rem; min-width: 20px; }

/* === Dashboard === */
.dash-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 40px 0 28px; flex-wrap: wrap; gap: 16px;
}
.dash-header h1 { font-size: 2rem; }
.dash-header p { margin-top: 4px; }

.dash-stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 16px; margin-bottom: 40px;
}
@media (max-width: 640px) { .dash-stats { grid-template-columns: 1fr; } }
.stat-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 22px;
}
.stat-label {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--text-dim); font-weight: 600; margin-bottom: 8px;
}
.stat-value { font-size: 1.8rem; font-weight: 800; letter-spacing: -0.02em; }
.stat-value.ok { color: #6ee7b7; }
.stat-value.warn { color: #fca5a5; }

.dash-challenges {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.dash-challenges-header {
  padding: 20px 24px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.dash-challenges-header h2 { font-size: 1.2rem; }
.challenge-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 24px; border-bottom: 1px solid var(--border);
  cursor: pointer; transition: background 0.15s;
}
.challenge-row:last-child { border-bottom: none; }
.challenge-row:hover { background: var(--bg-input); }
.challenge-row-name { font-weight: 600; }
.challenge-row-meta { color: var(--text-dim); font-size: 0.85rem; margin-top: 2px; }
.empty-state {
  padding: 60px 24px; text-align: center; color: var(--text-muted);
}
.empty-state h3 { color: var(--text); margin-bottom: 8px; }

/* === Results dashboard === */
.dashboard {
  display: grid; grid-template-columns: 280px 1fr;
  gap: 28px; min-height: 70vh;
}
@media (max-width: 880px) { .dashboard { grid-template-columns: 1fr; } }
.sidebar {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px;
  height: fit-content; position: sticky; top: 90px;
}
.sidebar h4 {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--text-dim); margin-bottom: 12px; font-weight: 600;
}
.tab {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 14px; border-radius: 10px;
  cursor: pointer; color: var(--text-muted);
  font-weight: 500; font-size: 0.92rem; margin-bottom: 4px;
  transition: all 0.15s; border: 1px solid transparent;
}
.tab:hover { background: var(--bg-input); color: var(--text); }
.tab.active { background: var(--accent-soft); color: var(--text); border-color: rgba(99, 102, 241, 0.3); }
.tab-icon {
  width: 26px; height: 26px; border-radius: 7px;
  background: var(--accent-gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; color: white;
}

.doc-panel { display: none; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.doc-panel.active { display: block; }
.doc-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 28px; border-bottom: 1px solid var(--border); gap: 16px;
}
.doc-header h3 { font-size: 1.2rem; }
.doc-body {
  padding: 28px; max-height: 70vh; overflow-y: auto;
  white-space: pre-wrap; word-wrap: break-word;
  font-family: 'Inter', sans-serif; font-size: 0.95rem; line-height: 1.7;
  color: var(--text);
}
.doc-body::-webkit-scrollbar { width: 8px; }
.doc-body::-webkit-scrollbar-track { background: transparent; }
.doc-body::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }

/* === Alerts === */
.alert {
  padding: 14px 18px; border-radius: var(--radius); margin-bottom: 16px; font-size: 0.9rem;
}
.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3); color: #fca5a5;
}
.alert-info {
  background: var(--accent-soft);
  border: 1px solid rgba(99, 102, 241, 0.3); color: #c7d2fe;
}
.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3); color: #6ee7b7;
}

/* === Footer === */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0; text-align: center;
  color: var(--text-dim); font-size: 0.9rem; margin-top: 80px;
}

/* Utility */
.text-center { text-align: center; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.mb-4 { margin-bottom: 32px; }
.hidden { display: none !important; }
.flex { display: flex; }
.gap-2 { gap: 12px; }
.gap-3 { gap: 18px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }