static/css/styles.css

:root {
  --bg: #f5f5f5;
  --panel-bg: #ffffff;
  --text: #202124;
  --muted: #5f6368;
  --accent: #1a73e8;
  --danger: #c5221f;
  --border: #dadce0;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  font-family: "Segoe UI", Tahoma, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #f7f9fc 0%, #eef1f6 100%);
  color: var(--text);
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 40px 20px 64px;
}

h1 {
  text-align: center;
  font-size: 32px;
  margin-bottom: 32px;
}

.panel {
  background: var(--panel-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 32px;
  margin-bottom: 32px;
  border: 1px solid rgba(32, 33, 36, 0.08);
}

.panel h2 {
  margin-top: 0;
}

.hidden {
  display: none;
}

.form {
  display: grid;
  gap: 20px;
}

.field-grid {
  display: grid;
  gap: 18px 24px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

label {
  display: grid;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
}

input,
textarea,
select {
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 15px;
  background: #fbfbff;
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid rgba(26, 115, 232, 0.35);
  outline-offset: 1px;
  border-color: var(--accent);
  background: #ffffff;
}

textarea {
  resize: vertical;
  min-height: 96px;
}

button {
  padding: 12px 20px;
  border-radius: 8px;
  border: none;
  font-size: 15px;
  font-weight: 600;
  background: var(--accent);
  color: white;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background: #0f5ec4;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.link-button {
  background: none;
  color: var(--accent);
  padding: 0;
}

.link-button:hover {
  color: #0f5ec4;
  background: none;
}

.hint {
  color: var(--muted);
  font-size: 13px;
  margin: 0;
}

.feedback {
  color: var(--muted);
  min-height: 20px;
  font-size: 14px;
}

.feedback.error {
  color: var(--danger);
}

.feedback.success {
  color: #188038;
}

.invoice-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.business-section {
  border: 1px solid rgba(32, 33, 36, 0.08);
  border-radius: var(--radius);
  padding: 20px 24px;
  background: #fbfcff;
  margin-bottom: 24px;
}

.business-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.business-display {
  display: grid;
  gap: 6px;
  font-size: 15px;
  line-height: 1.4;
}

.business-display strong {
  font-weight: 600;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.items-section {
  border: 1px solid rgba(32, 33, 36, 0.08);
  border-radius: var(--radius);
  padding: 20px 24px;
  background: #ffffff;
  display: grid;
  gap: 18px;
}

.items-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.items-table-wrapper {
  overflow-x: auto;
}

.items-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.items-table th,
.items-table td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}

.items-table th {
  background: #f1f3f7;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.items-table input,
.items-table select {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #ffffff;
}

.items-table .remove-item {
  color: var(--danger);
  background: none;
  padding: 0;
}

.items-table .remove-item:hover {
  text-decoration: underline;
}

.totals {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-weight: 600;
  margin-top: 8px;
  padding: 12px 16px;
  border-radius: 8px;
  background: #f7f9ff;
}

.rate-summary {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}

.rate-summary-item {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-weight: 600;
  padding: 8px 12px;
  border: 1px dashed rgba(26, 115, 232, 0.25);
  border-radius: 6px;
  background: #ffffff;
}

.invoice-preview {
  display: grid;
  gap: 24px;
}

.invoice-preview-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  font-size: 14px;
}

.invoice-preview-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.invoice-preview-header {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.invoice-preview-card {
  flex: 1 1 280px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  background: #f9fafc;
}

.invoice-preview-card h4 {
  margin: 0 0 12px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.invoice-preview-card p {
  margin: 4px 0;
  font-size: 14px;
}

.invoice-preview table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.invoice-preview th,
.invoice-preview td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}

.invoice-preview th {
  background: #f1f3f7;
  font-weight: 600;
}

.invoice-preview-summary {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 16px;
  font-weight: 600;
  font-size: 15px;
}

.invoice-preview-note {
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: #f4f8ff;
  font-size: 14px;
}

@media (max-width: 640px) {
  .panel {
    padding: 20px;
  }

  .invoice-header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .business-section,
  .items-section {
    padding: 16px;
  }
}