:root {
  color-scheme: light;
  --ink: #17201c;
  --muted: #66716b;
  --faint: #8b958f;
  --paper: #fbfcfa;
  --surface: #ffffff;
  --line: #dfe5e1;
  --line-strong: #cbd4ce;
  --accent: #126447;
  --accent-deep: #0b4c35;
  --accent-soft: #e8f3ed;
  --danger: #a9342f;
  --danger-soft: #fbeceb;
  --warning: #76570c;
  --warning-soft: #fff4d5;
  --shadow: 0 18px 55px rgba(30, 53, 43, 0.08);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--paper);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 5%, rgba(173, 218, 196, 0.27), transparent 30rem),
    var(--paper);
}

button,
input {
  font: inherit;
}

button {
  touch-action: manipulation;
}

.site-header {
  width: min(1120px, calc(100% - 40px));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(203, 212, 206, 0.75);
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--ink);
  font-weight: 760;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: white;
  background: var(--accent);
  font-family: Georgia, serif;
  font-size: 21px;
  line-height: 1;
}

.site-label {
  color: var(--muted);
  font-size: 14px;
}

.header-actions {
  display: flex;
  gap: 14px;
  align-items: center;
}

.lang-switch {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
}

.lang-button {
  min-width: 32px;
  min-height: 28px;
  padding: 0 8px;
  border: none;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.lang-button:hover:not(.is-active) {
  color: var(--ink);
  background: var(--accent-soft);
}

.lang-button.is-active {
  color: white;
  background: var(--accent);
}

.shell {
  width: min(880px, calc(100% - 40px));
  margin: 0 auto;
  padding: 76px 0 90px;
}

.hero {
  max-width: 680px;
  margin-bottom: 34px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1,
h2,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-family: Georgia, "Songti SC", serif;
  font-size: clamp(34px, 5.7vw, 58px);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.09;
}

.intro {
  max-width: 580px;
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  font-weight: 560;
  line-height: 1.55;
}

.tutorial {
  max-width: 680px;
  margin: 0 0 34px;
  padding: 22px 26px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--accent-soft);
}

.tutorial h2 {
  margin: 0 0 12px;
  color: var(--accent-deep);
  font-family: Georgia, "Songti SC", serif;
  font-size: 19px;
  font-weight: 600;
}

.tutorial-steps {
  margin: 0;
  padding-left: 22px;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.75;
}

.tutorial-steps li + li {
  margin-top: 4px;
}

.query-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

label {
  display: block;
  margin: 0 0 9px;
  font-size: 14px;
  font-weight: 720;
}

.query-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
}

input {
  min-width: 0;
  height: 48px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  color: var(--ink);
  background: white;
  outline: none;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

input::placeholder {
  color: var(--faint);
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(18, 100, 71, 0.13);
}

.button {
  min-height: 48px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 11px;
  font-weight: 720;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.button:active:not(:disabled) {
  transform: translateY(1px);
}

.button:focus-visible {
  outline: 3px solid rgba(18, 100, 71, 0.22);
  outline-offset: 2px;
}

.button-primary {
  color: white;
  background: var(--accent);
}

.button-primary:hover:not(:disabled) {
  background: var(--accent-deep);
}

.button-secondary {
  border-color: var(--line-strong);
  color: var(--ink);
  background: var(--surface);
}

.button-secondary:hover:not(:disabled) {
  border-color: #aebbb3;
  background: #f7f9f7;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.field-hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.status {
  margin-top: 18px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  background: #f7f9f7;
  font-size: 14px;
  line-height: 1.55;
}

.status[data-kind="error"] {
  border-color: #efc6c3;
  color: var(--danger);
  background: var(--danger-soft);
}

.status[data-kind="busy"] {
  color: var(--accent-deep);
  background: var(--accent-soft);
}

.results {
  margin-top: 58px;
}

.results-heading-row {
  display: flex;
  gap: 24px;
  align-items: end;
  justify-content: space-between;
  padding: 0 2px 15px;
  border-bottom: 1px solid var(--line);
}

.results h2 {
  margin: 0;
  font-family: Georgia, "Songti SC", serif;
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.025em;
}

.results-summary {
  margin: 0 0 3px;
  color: var(--muted);
  font-size: 13px;
  text-align: right;
}

.mail-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mail-card {
  padding: 28px 2px 30px;
  border-bottom: 1px solid var(--line);
}

.mail-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px 22px;
  align-items: start;
}

.mail-subject {
  margin: 0;
  font-size: 19px;
  font-weight: 740;
  line-height: 1.42;
}

.mail-time {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.mail-from {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.mail-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 13px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 2px 8px;
  border-radius: 999px;
  color: var(--warning);
  background: var(--warning-soft);
  font-size: 11px;
  font-weight: 700;
}

.mail-body {
  max-height: 34rem;
  margin: 20px 0 0;
  padding: 18px;
  overflow: auto;
  border: 1px solid #e6ebe7;
  border-radius: 12px;
  color: #29342f;
  background: #f7f9f7;
  font-size: 15px;
  line-height: 1.75;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  word-break: break-word;
}

.empty-state {
  margin: 0;
  padding: 50px 20px;
  color: var(--muted);
  text-align: center;
}


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

[hidden] {
  display: none !important;
}

@media (max-width: 700px) {
  .site-header,
  .shell {
    width: min(100% - 28px, 880px);
  }

  .shell {
    padding-top: 50px;
  }

  .query-card {
    padding: 20px;
    border-radius: 16px;
  }

  .query-controls {
    grid-template-columns: 1fr 1fr;
  }

  .query-controls input {
    grid-column: 1 / -1;
  }

  .mail-head {
    grid-template-columns: 1fr;
  }

  .mail-time,
  .mail-from {
    grid-column: 1;
  }

  .mail-time {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}