:root {
  --bg-primary: #F0F0F5;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8F8FC;
  --border: #E2E4EB;
  --border-focus: #6366F1;
  --accent: #111111;
  --accent-hover: #333333;
  --text-primary: #0F172A;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --success: #22C55E;
  --error: #DC2626;
  --glow: rgba(99, 102, 241, 0.08);
  --indigo: #6366F1;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ─── Logo Icons ─────────────────────────────────── */

.logo-icon {
  display: block;
}

.logo-icon-lg {
  width: 56px;
  height: 56px;
  margin: 0 auto;
}

.logo-icon-sm {
  width: 32px;
  height: 32px;
}

/* ─── Login View ──────────────────────────────────── */

#login-view {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.login-logo {
  text-align: center;
  margin-bottom: 2rem;
}

.login-logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 0.75rem;
  color: var(--text-primary);
}

.login-logo p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  letter-spacing: 0.1em;
  text-align: center;
  text-transform: uppercase;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input::placeholder {
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: normal;
  font-family: 'Inter', system-ui, sans-serif;
}

.form-group input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--glow);
}

.btn-primary {
  width: 100%;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 9999px;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

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

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.login-error {
  margin-top: 1rem;
  padding: 0.75rem;
  background: rgba(220, 38, 38, 0.06);
  border: 1px solid rgba(220, 38, 38, 0.2);
  border-radius: 8px;
  color: var(--error);
  font-size: 0.8125rem;
  text-align: center;
  display: none;
}

.login-error.visible {
  display: block;
}

/* ─── Releases View ───────────────────────────────── */

#releases-view {
  display: none;
  min-height: 100vh;
}

.releases-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.releases-header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.releases-header-left h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

.releases-header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.customer-name {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.btn-logout {
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 9999px;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.btn-logout:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.releases-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}

.releases-empty {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.releases-empty p {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.releases-empty small {
  font-size: 0.8125rem;
}

/* ─── Release Card ────────────────────────────────── */

.release-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: box-shadow 0.2s;
}

.release-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.release-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.release-version {
  font-size: 1.25rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

.release-date {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.release-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.release-changelog {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.release-changelog ul {
  list-style: none;
  padding: 0;
}

.release-changelog li {
  padding: 0.25rem 0;
  padding-left: 1.25rem;
  position: relative;
}

.release-changelog li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--indigo);
  font-family: monospace;
}

.release-requirements {
  margin-bottom: 1.25rem;
  padding: 0.75rem 1rem;
  background: rgba(99, 102, 241, 0.04);
  border: 1px solid rgba(99, 102, 241, 0.08);
  border-radius: 8px;
}

.release-requirements h4 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.release-requirements ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.25rem;
}

.release-requirements li {
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

.release-files {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-download:hover {
  background: var(--accent-hover);
}

.btn-download:active {
  transform: scale(0.97);
}

.btn-download:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-download .file-size {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.75rem;
}

/* ─── Loading Spinner ─────────────────────────────── */

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ─── Responsive ──────────────────────────────────── */

@media (max-width: 640px) {
  .login-card {
    padding: 1.75rem;
  }

  .releases-header {
    padding: 1rem;
  }

  .releases-container {
    padding: 1rem;
  }

  .release-files {
    flex-direction: column;
  }

  .btn-download {
    width: 100%;
    justify-content: center;
  }
}