:root {
  --bg: #0a0a0f;
  --bg-elev: #12121a;
  --bg-card: #1a1a24;
  --border: #2a2a38;
  --text: #f5f5f7;
  --text-dim: #8b8b9c;
  --accent: #00ff88;
  --accent-dim: #00cc6e;
  --warn: #ffb84d;
  --danger: #ff4d6d;
}

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

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.hub-nav {
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hub-nav-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.hub-nav-brand span {
  color: var(--accent);
}

.hub-nav-user {
  font-size: 14px;
  color: var(--text-dim);
  display: flex;
  gap: 16px;
  align-items: center;
}

.hub-nav-user button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

.hub-nav-user button:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

.hub-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px;
}

.hub-balance-card {
  background: linear-gradient(135deg, var(--bg-card) 0%, #1f1f2e 100%);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  margin-bottom: 32px;
  text-align: center;
}

.hub-balance-label {
  font-size: 14px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.hub-balance-amount {
  font-size: 56px;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hub-balance-sub {
  font-size: 14px;
  color: var(--text-dim);
  margin-top: 8px;
}

.hub-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.hub-feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
  display: block;
  color: var(--text);
}

.hub-feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}

.hub-feature-card.locked {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.hub-feature-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}

.hub-feature-desc {
  font-size: 14px;
  color: var(--text-dim);
}

.hub-feature-badge {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hub-feature-badge.locked {
  background: var(--border);
  color: var(--text-dim);
}

.hub-section-title {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.hub-button-primary {
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 16px 32px;
  font-size: 16px;
  font-weight: 700;
  border-radius: 10px;
  cursor: pointer;
  width: 100%;
  transition: background 0.15s;
}

.hub-button-primary:hover {
  background: var(--accent-dim);
}

.hub-button-primary:disabled {
  background: var(--border);
  color: var(--text-dim);
  cursor: not-allowed;
}

.hub-button-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
}

.hub-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 14px 16px;
  font-size: 16px;
  border-radius: 10px;
  font-family: inherit;
}

.hub-input:focus {
  outline: none;
  border-color: var(--accent);
}

.hub-login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.hub-login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  max-width: 420px;
  width: 100%;
}

.hub-login-title {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.hub-login-sub {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.hub-login-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.hub-message {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  margin-top: 12px;
}

.hub-message.success {
  background: rgba(0, 255, 136, 0.1);
  color: var(--accent);
  border: 1px solid rgba(0, 255, 136, 0.3);
}

.hub-message.error {
  background: rgba(255, 77, 109, 0.1);
  color: var(--danger);
  border: 1px solid rgba(255, 77, 109, 0.3);
}

.studio-action-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  text-align: center;
  margin-bottom: 24px;
}

.studio-action-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.studio-action-cost {
  display: inline-block;
  background: rgba(0, 255, 136, 0.1);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 24px;
}

.studio-pack-list {
  display: grid;
  gap: 12px;
}

.studio-pack-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.studio-pack-item-title {
  font-weight: 600;
  font-size: 14px;
}

.studio-pack-item-meta {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 2px;
}

.studio-pack-item-link {
  font-size: 13px;
  font-weight: 600;
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}