:root {
  font-family: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --red: #8a1c24;
  --red-dark: #6f121a;
  --gold: #d7a14a;
  --gold-light: rgba(215, 161, 74, 0.5);
  --ink: #1f1a17;
  --paper: #f5efe5;
  --paper-deep: #efe7da;
  --shadow: rgba(55, 34, 24, 0.18);
  --radius: 20px;
  --line: rgba(215, 161, 74, 0.4);
  --glow: rgba(138, 28, 36, 0.22);
  color: var(--ink);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--paper);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
  position: relative;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

body::before {
  background-image:
    radial-gradient(circle at 10% 10%, rgba(138, 28, 36, 0.08), transparent 35%),
    radial-gradient(circle at 90% 0%, rgba(215, 161, 74, 0.12), transparent 40%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.6), transparent 45%);
}

body::after {
  background-image: repeating-linear-gradient(
      0deg,
      rgba(0, 0, 0, 0.015),
      rgba(0, 0, 0, 0.015) 1px,
      transparent 1px,
      transparent 3px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(0, 0, 0, 0.02),
      rgba(0, 0, 0, 0.02) 1px,
      transparent 1px,
      transparent 4px
    );
  opacity: 0.5;
}

body .jiangnan {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.jiangnan::before,
.jiangnan::after {
  content: "";
  position: absolute;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(138, 28, 36, 0.15), transparent 70%);
  opacity: 0.5;
}

.jiangnan::before {
  top: -80px;
  right: 10%;
}

.jiangnan::after {
  bottom: -120px;
  left: 8%;
}

#celebration-canvas {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.page {
  position: relative;
  z-index: 2;
  max-width: 980px;
  width: min(100%, 980px);
  padding: clamp(28px, 5vw, 52px);
  background: rgba(245, 239, 229, 0.85);
  border-radius: calc(var(--radius) + 6px);
  border: 1px solid rgba(215, 161, 74, 0.25);
  box-shadow: 0 18px 40px var(--shadow);
  backdrop-filter: blur(6px);
  overflow: hidden;
}

.page::before {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: calc(var(--radius));
  border: 1px solid var(--line);
  pointer-events: none;
}

.page::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.4), transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(215, 161, 74, 0.12), transparent 45%);
  opacity: 0.7;
  pointer-events: none;
}

.hero {
  display: grid;
  gap: 12px;
  margin-bottom: 30px;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  right: 0;
  top: 56px;
  width: 180px;
  height: 120px;
  background: linear-gradient(180deg, rgba(138, 28, 36, 0.15), transparent 70%);
  border-radius: 50%;
  filter: blur(6px);
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.seal {
  width: 44px;
  height: 44px;
  background: var(--red);
  color: #f9f4ea;
  display: grid;
  place-items: center;
  border-radius: 14px;
  font-size: 20px;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(138, 28, 36, 0.28);
}

.icon-button {
  width: 42px;
  height: 42px;
  border: 1px solid rgba(138, 28, 36, 0.3);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.7);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.icon-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(138, 28, 36, 0.18);
}

.icon-button:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

.gear {
  width: 18px;
  height: 18px;
  border: 2px solid var(--red);
  border-radius: 50%;
  position: relative;
}

.gear::before,
.gear::after {
  content: "";
  position: absolute;
  inset: -6px;
  border: 2px solid transparent;
  border-top-color: var(--red);
  border-bottom-color: var(--red);
  border-radius: 50%;
}

.kicker {
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: rgba(138, 28, 36, 0.7);
}

h1 {
  font-size: clamp(2.3rem, 6vw, 4.2rem);
  color: var(--red-dark);
}

.subtitle {
  font-size: 1.1rem;
  color: rgba(31, 26, 23, 0.7);
}

.countdown {
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin: 24px 0;
}

.countdown::before {
  content: "";
  position: absolute;
  inset: -20px -12px auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-light), transparent);
  opacity: 0.6;
}

.unit {
  padding: 18px 16px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--line);
  text-align: center;
  box-shadow: inset 0 0 16px rgba(215, 161, 74, 0.12);
}

.value {
  font-family: "Helvetica Neue", "Arial", "PingFang SC", sans-serif;
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--ink);
  height: 3.2rem;
  overflow: hidden;
  position: relative;
}

.value span {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  transition: transform 0.4s ease, opacity 0.4s ease;
}

.value .next {
  position: absolute;
  inset: 0;
  transform: translateY(100%);
  opacity: 0;
}

.value.flip .current {
  transform: translateY(-100%);
  opacity: 0;
}

.value.flip .next {
  transform: translateY(0);
  opacity: 1;
}

.unit small {
  display: block;
  margin-top: 6px;
  letter-spacing: 0.3em;
  font-size: 0.8rem;
  color: rgba(31, 26, 23, 0.6);
}

.panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.panel-card {
  padding: 16px 18px;
  border-radius: calc(var(--radius) - 6px);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(215, 161, 74, 0.25);
  color: rgba(31, 26, 23, 0.7);
}

.panel-card h2 {
  font-size: 0.9rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(138, 28, 36, 0.75);
  margin-bottom: 6px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.primary,
.ghost {
  padding: 10px 20px;
  border-radius: 999px;
  border: none;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary {
  background: linear-gradient(135deg, var(--red), #b02a32);
  color: #fff;
  box-shadow: 0 10px 20px var(--glow);
}

.ghost {
  background: transparent;
  color: var(--red-dark);
  border: 1px solid rgba(138, 28, 36, 0.4);
}

.primary:hover,
.ghost:hover {
  transform: translateY(-2px);
}

.footer {
  position: relative;
  color: rgba(31, 26, 23, 0.6);
  font-size: 0.95rem;
  display: grid;
  gap: 12px;
}

.footer-about {
  padding: 14px 16px;
  border-radius: calc(var(--radius) - 8px);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(215, 161, 74, 0.2);
  color: rgba(31, 26, 23, 0.7);
  box-shadow: inset 0 0 12px rgba(215, 161, 74, 0.08);
}

.footer-about h3 {
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(138, 28, 36, 0.7);
  margin-bottom: 6px;
}

.footer-about p {
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer::before {
  content: "";
  position: absolute;
  top: -18px;
  left: 0;
  width: 100%;
  height: 10px;
  background: radial-gradient(circle at 10px 5px, rgba(215, 161, 74, 0.5) 2px, transparent 3px)
      0 0 / 24px 10px repeat-x,
    linear-gradient(90deg, rgba(215, 161, 74, 0.25), transparent 50%, rgba(215, 161, 74, 0.25));
  opacity: 0.6;
}

.settings {
  position: fixed;
  inset: 0;
  background: rgba(17, 24, 39, 0.4);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 5;
  padding: 24px;
}

.settings.active {
  display: flex;
}

.settings-card {
  background: rgba(245, 239, 229, 0.95);
  border-radius: var(--radius);
  padding: 24px;
  width: min(100%, 420px);
  border: 1px solid var(--line);
  box-shadow: 0 20px 30px rgba(31, 26, 23, 0.2);
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.close {
  width: 16px;
  height: 16px;
  position: relative;
}

.close::before,
.close::after {
  content: "";
  position: absolute;
  inset: 0;
  width: 2px;
  background: var(--red);
  left: 50%;
  transform-origin: center;
}

.close::before {
  transform: rotate(45deg);
}

.close::after {
  transform: rotate(-45deg);
}

.field {
  display: grid;
  gap: 6px;
  font-size: 0.9rem;
  color: rgba(31, 26, 23, 0.7);
  margin-bottom: 14px;
}

input,
select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(138, 28, 36, 0.25);
  background: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .page {
    text-align: center;
  }

  .actions {
    flex-direction: column;
  }

  .panel,
  .countdown {
    justify-items: center;
  }

  .unit,
  .panel-card {
    width: min(100%, 260px);
  }

  .footer::before {
    left: 50%;
    transform: translateX(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .value span {
    transition: none;
  }

  .primary,
  .ghost,
  .icon-button {
    transition: none;
  }
}