:root {
  --page-bg: #f4f5f7;
  --panel-bg: #ffffff;
  --panel-border: #dddddf;
  --text-main: #181818;
  --text-muted: #6d6d73;
  --input-border: #cfd1d4;
  --accent: #2cb7e8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: var(--page-bg);
  color: var(--text-main);
}

.signature-generator-page {
  min-height: 100vh;
}

.container-shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 36px 20px 56px;
}

.page-header {
  margin-bottom: 24px;
}

.page-header h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.page-header p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.55;
}

.layout-grid {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
}

.form-panel,
.preview-panel {
  padding: 24px;
}

.form-panel h2,
.preview-panel h2 {
  margin: 0 0 18px;
  font-size: 20px;
}

.section-title {
  margin-top: 24px !important;
}

.brand-switch {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

.brand-option {
  position: relative;
  display: block;
}

.brand-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.brand-option span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border: 1px solid var(--input-border);
  border-radius: 12px;
  background: #f8f8fa;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s, box-shadow 0.15s;
}

.brand-option input:checked + span {
  border-color: var(--accent);
  background: rgba(44, 183, 232, 0.08);
  color: #163866;
  box-shadow: 0 0 0 3px rgba(44, 183, 232, 0.12);
}

.field {
  margin-bottom: 16px;
}

label {
  display: block;
  margin-bottom: 7px;
  font-size: 13px;
  font-weight: 600;
}

input[type="text"],
input[type="email"] {
  width: 100%;
  height: 46px;
  padding: 0 13px;
  border: 1px solid var(--input-border);
  border-radius: 10px;
  font: 400 15px Inter, Arial, sans-serif;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input[type="text"]:focus,
input[type="email"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(44, 183, 232, 0.12);
}

.brand-extra-options {
  margin: 18px 0 0;
  padding: 14px 14px 10px;
  border: 1px solid var(--input-border);
  border-radius: 12px;
  background: #fafbfd;
}

.brand-extra-options h3 {
  margin: 0 0 10px;
  font-size: 14px;
}

.check-option {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  cursor: pointer;
  user-select: none;
}

.check-option input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.check-option span {
  font-size: 14px;
  font-weight: 500;
}

.hint,
.panel-note,
.status {
  color: var(--text-muted);
}

.hint {
  margin: -6px 0 16px;
  font-size: 12px;
  line-height: 1.45;
}

.button-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 22px;
}

.btn {
  min-height: 44px;
  border: 0;
  border-radius: 10px;
  font: 600 14px Inter, Arial, sans-serif;
  cursor: pointer;
  transition: transform 0.05s, opacity 0.15s;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
}

.btn-secondary {
  background: #ececef;
  color: #1f1f23;
}

.btn-full {
  width: 100%;
  margin-top: 10px;
}

.panel-note {
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.5;
}

.canvas-frame {
  width: 100%;
  background: #e5e5e5;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid #d7d7da;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
}

.status {
  min-height: 22px;
  margin: 12px 0 0;
  font-size: 13px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 900px) {
  .layout-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .button-grid,
  .brand-switch {
    grid-template-columns: 1fr;
  }

  .form-panel,
  .preview-panel {
    padding: 18px;
  }

  .container-shell {
    padding-inline: 12px;
  }
}


input[type="file"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--input-border);
  border-radius: 10px;
  background: #ffffff;
  font: 400 14px Inter, Arial, sans-serif;
}

.secondary-action {
  width: 100%;
}

.brand-extra-options .hint {
  margin: 4px 0 12px;
}

input[type="url"] {
  width: 100%;
  height: 46px;
  padding: 0 13px;
  border: 1px solid var(--input-border);
  border-radius: 10px;
  font: 400 15px Inter, Arial, sans-serif;
  outline: none;
}
input[type="url"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(44, 183, 232, 0.12);
}