:root {
  --bg-top: #f0f6ff;
  --bg-bottom: #d8ebe4;
  --panel: rgba(255, 255, 255, 0.88);
  --text: #102033;
  --muted: #5d6d80;
  --accent: #0059b2;
  --accent-strong: #003f80;
  --success: #0e7a42;
  --error: #bc2d32;
  --border: rgba(16, 32, 51, 0.12);
  --shadow: 0 24px 60px rgba(7, 27, 50, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0, 89, 178, 0.18), transparent 28%),
    linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
}

.page {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
  align-items: center;
}

.hero,
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.hero {
  padding: 56px;
}

.eyebrow {
  margin: 0 0 14px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.74rem;
  color: var(--accent);
  font-weight: 700;
}

h1,
h2 {
  margin: 0;
  line-height: 1.05;
}

h1 {
  font-size: clamp(2.6rem, 5vw, 4.6rem);
  max-width: 10ch;
}

.subtitle,
.modal-text,
.message {
  color: var(--muted);
  line-height: 1.7;
}

.subtitle {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 1.02rem;
}

.pricing-card {
  margin-top: 32px;
  padding: 24px;
  border-radius: 22px;
  background: linear-gradient(135deg, #08376c, #0059b2);
  color: #fff;
  display: inline-flex;
  flex-direction: column;
  gap: 8px;
}

.pricing-label,
.pricing-note {
  opacity: 0.88;
}

.pricing-card strong {
  font-size: 2.4rem;
  line-height: 1;
}

.panel {
  padding: 32px;
}

.upgrade-form {
  display: grid;
  gap: 18px;
}

.field {
  display: grid;
  gap: 8px;
}

.field-guide {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.field span {
  font-weight: 600;
}

.sn-input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
}

.field input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 18px;
  font-size: 1rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.92);
}

.field input:focus {
  outline: 2px solid rgba(0, 89, 178, 0.22);
  border-color: rgba(0, 89, 178, 0.38);
}

.purchase-button,
.ghost-button {
  border: 0;
  border-radius: 999px;
  padding: 16px 22px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, opacity 0.18s ease, background 0.18s ease;
}

.purchase-button {
  background: var(--accent);
  color: #fff;
}

.purchase-button:hover,
.ghost-button:hover {
  transform: translateY(-1px);
}

.purchase-button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  transform: none;
}

.ghost-button {
  background: rgba(16, 32, 51, 0.08);
  color: var(--text);
}

.scan-button {
  min-width: 108px;
  white-space: nowrap;
}

.message {
  min-height: 28px;
  margin: 18px 4px 0;
}

.message.error {
  color: var(--error);
}

.message.success {
  color: var(--success);
}

.device-summary {
  border: 1px solid rgba(0, 89, 178, 0.14);
  background: rgba(0, 89, 178, 0.05);
  border-radius: 18px;
  padding: 16px 18px;
  color: var(--text);
  line-height: 1.6;
}

.hidden {
  display: none !important;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(9, 18, 29, 0.42);
  display: grid;
  place-items: center;
  padding: 24px;
}

.modal-card {
  width: min(480px, 100%);
  padding: 28px;
  border-radius: 26px;
  background: #fff;
  box-shadow: var(--shadow);
}

.scanner-card {
  width: min(560px, 100%);
}

.scanner-preview-wrap {
  margin-top: 18px;
  min-height: 280px;
  border-radius: 22px;
  overflow: hidden;
  background: #061120;
  position: relative;
  display: grid;
  place-items: center;
}

.scanner-region,
.scanner-region video {
  width: 100%;
  min-height: 280px;
  display: block;
}

.scanner-region video {
  object-fit: cover;
}

.scanner-region {
  width: 100%;
}

.scanner-region > div {
  border: 0 !important;
}

.scanner-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.88);
  background: rgba(6, 17, 32, 0.9);
}

.scanner-message {
  min-height: 24px;
  margin: 14px 0 0;
  color: var(--muted);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
}

@media (max-width: 900px) {
  .page {
    grid-template-columns: 1fr;
    padding-top: 20px;
  }

  .hero,
  .panel {
    padding: 24px;
  }

  .sn-input-row {
    grid-template-columns: 1fr;
  }
}