:root {
  --color-primary: rgb(27, 153, 130);
  --color-primary-dark: rgb(22, 128, 109);
  --color-primary-light: rgba(27, 153, 130, 0.12);
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-border: #e5e5e5;
  --color-bg: #f7f9f8;
  --color-card: #fff;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 0 16px;
  border-bottom: 2px solid var(--color-primary);
}

.header__logo {
  flex-shrink: 0;
  object-fit: contain;
  border-radius: 8px;
}

.header__logo:not([hidden]) {
  display: block;
}

.header__title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary-dark);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 24px 0;
}

.panel {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.panel--results {
  gap: 20px;
}

.query-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field__label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
}

.field__input {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.query-form__hint {
  margin: -4px 0 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.btn {
  display: block;
  width: 100%;
  padding: 14px 20px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
}

.btn--secondary {
  color: var(--color-primary);
  background: var(--color-card);
  border: 2px solid var(--color-primary);
}

.btn--secondary:hover {
  background: var(--color-primary-light);
}

.results {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.results__empty {
  text-align: center;
  padding: 32px 16px;
  font-size: 1rem;
  color: var(--color-text-muted);
}

.results__count {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0 0 4px;
}

.cert-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  border-left: 4px solid var(--color-primary);
}

.cert-card__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 6px 0;
  font-size: 0.95rem;
}

.cert-card__row:not(:last-child) {
  border-bottom: 1px dashed var(--color-border);
}

.cert-card__label {
  flex-shrink: 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.cert-card__value {
  text-align: right;
  font-weight: 500;
  word-break: break-all;
}

.footer {
  padding: 20px 0 24px;
  text-align: center;
}

.footer__org {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.form-error {
  margin: 0;
  font-size: 0.85rem;
  color: #c0392b;
}

.loading {
  text-align: center;
  padding: 40px;
  color: var(--color-text-muted);
}

@media (min-width: 481px) {
  .app {
    padding: 0 24px;
  }

  .header__title {
    font-size: 1.15rem;
  }
}