:root {
  --color-bg: #f4f5f7;
  --color-panel: #ffffff;
  --color-border: #dcdfe4;
  --color-text: #1f2430;
  --color-muted: #6b7280;
  --color-accent: #2c5f8a;
  --color-accent-hover: #234a6c;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
}

/* ---------- Login screen ---------- */

.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-box {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 340px;
  width: 100%;
  text-align: center;
}

.login-box h1 {
  font-size: 20px;
  margin: 0 0 8px;
}

.login-box p {
  color: var(--color-muted);
  margin: 0 0 16px;
  font-size: 14px;
}

.login-box input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 15px;
  margin-bottom: 12px;
}

.login-box button {
  width: 100%;
  padding: 10px 12px;
  border: none;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: white;
  font-size: 15px;
  cursor: pointer;
}

.login-box button:hover {
  background: var(--color-accent-hover);
}

.error-text {
  color: #c0392b;
  font-size: 13px;
  margin: 12px 0 0;
}

/* ---------- App layout ---------- */

.app-header {
  padding: 16px 24px;
  background: var(--color-panel);
  border-bottom: 1px solid var(--color-border);
}

.app-header h1 {
  margin: 0;
  font-size: 18px;
}

.app-main {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding: 24px;
  align-items: flex-start;
}

.controls-panel {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  width: 320px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.field input[type="text"],
.field input[type="date"] {
  padding: 9px 11px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 15px;
  width: 100%;
}

.options-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.swatch-option {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 13px;
  background: #fafbfc;
}

.swatch-option:has(input:checked) {
  border-color: var(--color-accent);
  background: #eaf1f7;
}

.swatch-option input {
  margin: 0;
}

.swatch {
  display: inline-block;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid rgba(0, 0, 0, 0.15);
}

.export-btn {
  margin-top: 4px;
  padding: 12px 16px;
  border: none;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: white;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

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

.preview-panel {
  flex: 1;
  min-width: 280px;
  display: flex;
  justify-content: center;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

#preview-canvas {
  width: 100%;
  max-width: 780px;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  display: block;
}

/* ---------- Mobile ---------- */

@media (max-width: 700px) {
  .app-main {
    padding: 12px;
    gap: 12px;
  }

  .controls-panel {
    width: 100%;
  }
}