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

:root {
  --color-navy: #1a1a2e;
  --color-blue: #4f8ef7;
  --color-blue-light: #7ec8e3;
  --color-bg: #f4f6fb;
  --color-surface: #ffffff;
  --color-border: #dde3ef;
  --color-text: #1e2333;
  --color-text-muted: #6b7a99;
  --color-required: #e05a5a;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(26, 26, 46, 0.08);
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.site-header {
  background: var(--color-navy);
  color: #fff;
  padding: 20px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.header-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.header-sub {
  font-size: 0.8rem;
  color: var(--color-blue-light);
  margin-top: 2px;
}

/* Privacy Banner */
.privacy-banner {
  background: #eaf3ff;
  border-bottom: 1px solid #c2d8f5;
  color: #2c5282;
  font-size: 0.85rem;
  padding: 10px 32px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.privacy-icon {
  font-style: normal;
  font-size: 1rem;
  flex-shrink: 0;
}

/* Main layout */
.main-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 32px;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
}

/* Form section */
.form-section,
.qr-section {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-border);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}

.required {
  font-size: 0.75rem;
  color: var(--color-required);
  font-weight: 400;
  margin-left: 6px;
}

input[type="text"],
input[type="password"],
select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.15s;
  outline: none;
}

input[type="text"]:focus,
input[type="password"]:focus,
select:focus {
  border-color: var(--color-blue);
  background: #fff;
}

.input-with-toggle {
  position: relative;
  display: flex;
}

.input-with-toggle input {
  padding-right: 44px;
}

.toggle-btn {
  position: absolute;
  right: 0;
  top: 0;
  height: 100%;
  width: 44px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s;
}

.toggle-btn:hover {
  color: var(--color-blue);
}

.eye-icon {
  width: 18px;
  height: 18px;
}

.form-group--checkbox {
  margin-top: 4px;
}

.checkbox-label {
  display: flex !important;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 400 !important;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  display: none;
}

.checkbox-custom {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
  background: var(--color-blue);
  border-color: var(--color-blue);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
  content: "";
  width: 5px;
  height: 9px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg) translate(-1px, -1px);
  display: block;
}

/* QR section */
.qr-section {
  display: flex;
  flex-direction: column;
}

.qr-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 0;
}

#qr-container {
  width: 256px;
  height: 256px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#qr-container canvas,
#qr-container img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.qr-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--color-text-muted);
  text-align: center;
}

.qr-placeholder svg {
  width: 100px;
  height: 100px;
  opacity: 0.4;
}

.qr-placeholder p {
  font-size: 0.85rem;
  line-height: 1.6;
}

/* WiFi info panel */
.wifi-info {
  margin-top: 16px;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  padding: 14px 16px;
}

.wifi-info-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.wifi-info-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.875rem;
}

.wifi-info-row dt {
  flex-shrink: 0;
  width: 80px;
  color: var(--color-text-muted);
  font-weight: 500;
}

.wifi-info-row dd {
  flex: 1;
  color: var(--color-text);
  font-family: "SFMono-Regular", Consolas, monospace;
  word-break: break-all;
  display: flex;
  align-items: center;
  gap: 8px;
}

.info-toggle-btn {
  flex-shrink: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.75rem;
  padding: 2px 8px;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: border-color 0.15s, color 0.15s;
}

.info-toggle-btn:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

.download-option {
  margin-top: 16px;
  margin-bottom: 0;
}

.download-btn {
  margin-top: 10px;
  width: 100%;
  padding: 12px;
  background: var(--color-blue);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.download-btn:hover:not(:disabled) {
  background: #3a7aee;
}

.download-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 20px 32px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* Responsive */
@media (max-width: 768px) {
  .site-header {
    padding: 16px 20px;
  }

  .privacy-banner {
    padding: 10px 20px;
  }

  .main-layout {
    grid-template-columns: 1fr;
    padding: 20px;
    gap: 16px;
  }

  #qr-container {
    width: 200px;
    height: 200px;
  }
}