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

:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #64748b;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border: #475569;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

/* Login Screen */
.screen {
  min-height: 100vh;
}

#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-dark) 0%, #1e3a5f 100%);
}

.login-card {
  background: var(--bg-card);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.logo {
  font-size: 64px;
  margin-bottom: 20px;
}

.logo-small {
  font-size: 32px;
  margin-right: 10px;
}

.login-card h1 {
  font-size: 24px;
  margin-bottom: 30px;
  color: var(--text-primary);
}

/* Forms */
.form-group {
  margin-bottom: 20px;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-row {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.form-row .form-group {
  flex: 1;
  min-width: 200px;
}

.form-group.full-width {
  flex: 100%;
}

.file-input-row {
  display: flex;
  gap: 15px;
  align-items: flex-end;
  margin-bottom: 15px;
  padding: 15px;
  background: var(--bg-input);
  border-radius: 8px;
}

.file-input-row .form-group {
  flex: 1;
  margin-bottom: 0;
}

.file-input-row .offset-input {
  flex: 0 0 150px;
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--secondary);
  color: white;
}

.btn-secondary:hover {
  background: #475569;
}

.btn-danger {
  background: var(--danger);
  color: white;
  padding: 8px 16px;
  font-size: 14px;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-full {
  width: 100%;
}

.error-text {
  color: var(--danger);
  margin-top: 15px;
  font-size: 14px;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 30px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.header-left {
  display: flex;
  align-items: center;
}

.header-left h1 {
  font-size: 20px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

#user-info {
  color: var(--text-secondary);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 5px;
  padding: 15px 30px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.tab {
  padding: 10px 20px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}

.tab:hover {
  background: var(--bg-input);
  color: var(--text-primary);
}

.tab.active {
  background: var(--primary);
  color: white;
}

/* Tab Content */
.tab-content {
  display: none;
  padding: 30px;
}

.tab-content.active {
  display: block;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 25px;
  margin-bottom: 25px;
  border: 1px solid var(--border);
}

.card h2 {
  font-size: 20px;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border);
}

.card h3 {
  font-size: 16px;
  margin: 25px 0 15px;
  color: var(--text-secondary);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

th, td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: var(--bg-input);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  font-size: 14px;
}

tr:hover td {
  background: rgba(59, 130, 246, 0.05);
}

/* Inline Forms */
.inline-form {
  display: flex;
  gap: 15px;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding: 15px;
  background: var(--bg-input);
  border-radius: 8px;
}

.inline-form input,
.inline-form select {
  padding: 10px 15px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
}

.inline-form input:focus,
.inline-form select:focus {
  outline: none;
  border-color: var(--primary);
}

/* Flash Section */
.flash-section {
  margin-top: 25px;
  padding-top: 25px;
  border-top: 1px solid var(--border);
}

.flash-section h3 {
  margin-top: 0;
}

#install-button-container {
  margin: 20px 0;
}

esp-web-install-button {
  --esp-tools-button-color: var(--primary);
  --esp-tools-button-text-color: white;
}

.flash-notes {
  background: var(--bg-input);
  padding: 15px;
  border-radius: 8px;
  margin-top: 20px;
}

.flash-notes p {
  color: var(--warning);
  font-weight: 600;
  margin-bottom: 10px;
}

.flash-notes ul {
  margin-left: 20px;
  color: var(--text-secondary);
}

.flash-notes li {
  margin: 5px 0;
}

.info-text {
  color: var(--text-secondary);
  margin-bottom: 15px;
}

#firmware-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.info-item {
  background: var(--bg-input);
  padding: 15px;
  border-radius: 8px;
}

.info-item label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 5px;
  text-transform: uppercase;
}

.info-item span {
  font-size: 16px;
  font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }
  
  .tabs {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .form-row {
    flex-direction: column;
  }
  
  .file-input-row {
    flex-direction: column;
  }
  
  .file-input-row .offset-input {
    flex: 1;
  }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.card {
  animation: fadeIn 0.3s ease;
}