:root {
  --bg: #0f1117;
  --bg-elevated: #171a23;
  --border: #262b38;
  --text: #e8ebf2;
  --muted: #99a2b6;
  --accent: #6ea8fe;
  --accent-strong: #3d7dfa;
  --accent-contrast: #08101f;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

html[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-elevated: #ffffff;
  --border: #dde3ee;
  --text: #161c2a;
  --muted: #5b667e;
  --accent: #2f6df0;
  --accent-strong: #1f56cc;
  --accent-contrast: #ffffff;
  --shadow: 0 10px 30px rgba(20, 33, 61, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  transition: background 0.2s ease, color 0.2s ease;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 0.5rem 1rem;
  z-index: 10;
}

.skip-link:focus {
  left: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 650;
  letter-spacing: 0.01em;
}

.brand-mark {
  font-size: 1.4rem;
}

main {
  flex: 1;
  width: min(760px, 100%);
  margin: 0 auto;
  padding: clamp(1rem, 4vw, 2.5rem);
  display: grid;
  gap: 1.25rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: clamp(1.1rem, 3vw, 1.75rem);
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.greeting-card {
  text-align: center;
  padding-block: clamp(1.75rem, 6vw, 3rem);
}

.greeting {
  margin: 0;
  font-size: clamp(1.9rem, 7vw, 3.2rem);
  font-weight: 700;
  line-height: 1.15;
  word-break: break-word;
}

.greeting-meta {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.field {
  margin-bottom: 1.1rem;
}

.field label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
}

input[type="text"],
select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

input[type="text"]:focus-visible,
select:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.hint {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

button {
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  border-radius: 9px;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
  transition: transform 0.06s ease, background 0.15s ease;
}

button:active {
  transform: translateY(1px);
}

.primary-btn {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--accent-contrast);
}

.ghost-btn {
  background: transparent;
  color: var(--text);
}

.ghost-btn:hover {
  border-color: var(--accent);
}

.status {
  margin: 0.85rem 0 0;
  min-height: 1.25rem;
  color: var(--accent);
  font-size: 0.86rem;
}

.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.history-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--bg);
  font-size: 0.94rem;
}

.history-list .stamp {
  color: var(--muted);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 1rem clamp(1rem, 4vw, 2.5rem);
  color: var(--muted);
  font-size: 0.82rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
}

.footer p {
  margin: 0;
}

.clock {
  font-variant-numeric: tabular-nums;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
}