:root {
  color-scheme: dark;
  --ink: #07111f;
  --ink-soft: #0e1a2a;
  --paper: #e8edf3;
  --mist: #aeb9c6;
  --gold: #b89a63;
  --line: rgba(232, 237, 243, 0.2);
  --danger: #e1a5a5;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--ink);
  color: var(--paper);
  font-family: "Songti SC", "Noto Serif CJK SC", "STSong", serif;
  -webkit-font-smoothing: antialiased;
}

button,
input,
a {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.shell {
  width: min(100%, 680px);
  margin: 0 auto;
  padding: max(32px, env(safe-area-inset-top)) 22px max(40px, env(safe-area-inset-bottom));
}

.masthead {
  padding: 30px 2px 42px;
  border-top: 1px solid var(--gold);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--gold);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.19em;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 17px;
  font-size: clamp(48px, 15vw, 82px);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: 0.06em;
}

.lead {
  max-width: 22em;
  margin-bottom: 0;
  color: var(--mist);
  font-size: 17px;
  line-height: 1.85;
}

.date-panel,
.result {
  padding: 30px 0 38px;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 27px;
}

.section-heading span {
  color: var(--gold);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 11px;
  letter-spacing: 0.12em;
}

.section-heading h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.date-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 10px;
}

label span {
  display: block;
  margin: 0 0 9px 2px;
  color: var(--mist);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 13px;
}

input {
  width: 100%;
  min-height: 56px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 0;
  outline: none;
  background: var(--ink-soft);
  color: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 19px;
  -moz-appearance: textfield;
}

input::-webkit-inner-spin-button,
input::-webkit-outer-spin-button {
  margin: 0;
  -webkit-appearance: none;
}

input:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--paper);
  outline-offset: 3px;
}

.form-error {
  min-height: 24px;
  margin: 10px 0 4px;
  color: var(--danger);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 13px;
  line-height: 1.6;
}

.primary-button {
  display: flex;
  width: 100%;
  min-height: 56px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--gold);
  border-radius: 0;
  background: var(--gold);
  color: var(--ink);
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 16px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-decoration: none;
}

.primary-button:active {
  background: #c8ad79;
}

.privacy,
.result-summary,
footer,
.dialog-note {
  color: var(--mist);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
}

.privacy {
  margin: 13px 0 0;
  font-size: 12px;
  line-height: 1.7;
  text-align: center;
}

.result[hidden] {
  display: none;
}

#moon-card {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(184, 154, 99, 0.45);
  background: var(--ink-soft);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.24);
}

.result-summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 18px 0 22px;
  font-size: 13px;
  line-height: 1.7;
}

.result-poem {
  margin: 21px 0 4px;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--gold);
}

.result-poem p {
  margin-bottom: 8px;
  color: var(--paper);
  font-size: 17px;
  line-height: 1.8;
}

.result-poem cite {
  color: var(--mist);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 12px;
  font-style: normal;
}

.result-summary p {
  margin: 0;
}

.result-summary p:last-child {
  max-width: 15em;
  text-align: right;
}

.result-summary strong,
.result-summary span {
  display: block;
}

.result-summary strong {
  color: var(--paper);
  font-size: 16px;
  font-weight: 600;
}

.actions {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
}

.text-button {
  min-width: 126px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--paper);
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 15px;
}

footer {
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
  font-size: 11px;
  line-height: 1.8;
}

footer p {
  margin-bottom: 6px;
}

.brand-signoff {
  margin-top: 26px;
  color: var(--gold);
  letter-spacing: 0.13em;
}

dialog {
  width: min(calc(100% - 24px), 620px);
  max-height: calc(100dvh - 24px);
  padding: 0;
  border: 1px solid rgba(184, 154, 99, 0.65);
  border-radius: 0;
  background: var(--ink);
  color: var(--paper);
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.82);
}

.dialog-inner {
  position: relative;
  padding: 28px 18px 20px;
  overflow: auto;
}

.dialog-inner h2 {
  margin-bottom: 22px;
  font-size: 22px;
  font-weight: 500;
}

.close-button {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  color: var(--paper);
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: 28px;
}

#saved-image {
  display: block;
  width: min(100%, 430px);
  margin: 0 auto 16px;
  border: 1px solid var(--line);
  -webkit-touch-callout: default;
  user-select: auto;
}

.download-link {
  margin-top: 8px;
}

.dialog-note {
  margin: 12px 0 0;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 440px) {
  .shell {
    padding-right: 18px;
    padding-left: 18px;
  }

  .masthead {
    padding-top: 24px;
  }

  .date-grid {
    gap: 7px;
  }

  input {
    padding: 0 10px;
  }

  .result-summary {
    display: block;
  }

  .result-summary p:last-child {
    max-width: none;
    margin-top: 8px;
    text-align: left;
  }

  .actions {
    grid-template-columns: 1fr;
  }

  .text-button {
    min-height: 50px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}