:root {
  --color-bg: #ffffff;
  --color-bg-section: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #e1e4ea;
  --color-text: #201f1e;
  --color-muted: #61656b;

  --color-primary: #0a3d62;
  --color-primary-dark: #072c47;
  --color-accent-bg: #eef5fc;
  --color-accent-border: #cfe3f7;

  --color-valid: #107c10;
  --color-valid-bg: #dff6dd;
  --color-valid-border: #b3e6b0;
  --color-revoked: #a4262c;
  --color-revoked-bg: #fde7e9;
  --color-revoked-border: #f3c6ca;
  --color-expired: #986f0b;
  --color-expired-bg: #fff4ce;
  --color-expired-border: #f6dfa1;
  --color-neutral: #4b5157;
  --color-neutral-bg: #f0f1f3;
  --color-neutral-border: #dcdfe4;

  --radius-md: 8px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);

  --font-sans: "Segoe UI", "Inter", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background: var(--color-bg-section);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */

.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  height: 44px;
  width: auto;
  display: block;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.01em;
}

/* ===== Main / search card ===== */

.page {
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 20px;
}

.search-card {
  width: 100%;
  max-width: 560px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 36px;
}

.search-card-header h1 {
  margin: 0 0 6px;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
}

.search-card-header p {
  margin: 0 0 28px;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.verify-form {
  display: flex;
  gap: 10px;
}

.input-wrapper {
  position: relative;
  flex: 1;
}

.input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--color-muted);
  pointer-events: none;
}

.verify-form input {
  width: 100%;
  padding: 13px 14px 13px 40px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg-section);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.verify-form input::placeholder {
  color: #8a8f96;
}

.verify-form input:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
}

.verify-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 108px;
  padding: 13px 22px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  color: #ffffff;
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.verify-form button:hover:not(:disabled) {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.verify-form button:focus-visible,
.verify-form input:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.verify-form button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== Error ===== */

.error-panel {
  margin-top: 18px;
  padding: 12px 14px;
  border: 1px solid var(--color-revoked-border);
  border-radius: var(--radius-md);
  background: var(--color-revoked-bg);
  color: var(--color-revoked);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ===== Result card ===== */

.result-card {
  margin-top: 24px;
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
}

.result-banner {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-valid-border);
  background: var(--color-valid-bg);
  margin-bottom: 20px;
}

.result-banner.status-revoked {
  border-color: var(--color-revoked-border);
  background: var(--color-revoked-bg);
}

.result-banner.status-expired {
  border-color: var(--color-expired-border);
  background: var(--color-expired-bg);
}

.result-banner.status-unknown {
  border-color: var(--color-neutral-border);
  background: var(--color-neutral-bg);
}

.result-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 1rem;
  line-height: 1;
  color: #ffffff;
  background: var(--color-valid);
}

.result-banner.status-revoked .result-icon {
  background: var(--color-revoked);
}

.result-banner.status-expired .result-icon {
  background: var(--color-expired);
}

.result-banner.status-unknown .result-icon {
  background: var(--color-neutral);
}

.result-banner h2 {
  margin: 0 0 4px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
}

.result-banner p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.5;
}

.result-details {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.detail-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--color-border);
}

.detail-row:last-child {
  border-bottom: none;
}

.detail-row dt {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-muted);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.detail-icon {
  width: 16px;
  height: 16px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.detail-row dd {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 500;
  text-align: right;
  word-break: break-word;
}

.status-badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--color-neutral-bg);
  color: var(--color-neutral);
}

.status-badge.status-valid {
  background: var(--color-valid-bg);
  color: var(--color-valid);
}

.status-badge.status-revoked {
  background: var(--color-revoked-bg);
  color: var(--color-revoked);
}

.status-badge.status-expired {
  background: var(--color-expired-bg);
  color: var(--color-expired);
}

/* ===== Footer ===== */

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 18px 24px;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-item {
  color: var(--color-muted);
  font-size: 0.82rem;
}

.footer-center {
  flex: 1;
  text-align: center;
}

/* ===== Utility ===== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ===== Responsive ===== */

@media (max-width: 720px) {
  .page {
    padding: 32px 16px;
  }

  .search-card {
    padding: 26px 20px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 10px 16px;
  }

  .brand-logo {
    height: 36px;
  }

  .brand-name {
    font-size: 1rem;
  }

  .verify-form {
    flex-direction: column;
  }

  .verify-form button {
    width: 100%;
  }

  .detail-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .detail-row dd {
    text-align: left;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-center {
    order: -1;
  }
}