:root {
  --bg: #f8e8f0;
  --bg-dots: #e0c8d8;
  --card-bg: #fff;
  --card-shadow: rgba(0,0,0,0.08);
  --card-shadow-1: #ffd6e8;
  --card-shadow-2: #c8f0e8;
  --card-shadow-scrapbook: #e8d8f0;
  --text: #444;
  --text-light: #999;
  --title: #ff6b9d;
  --subtitle: #cc88aa;
  --btn-primary-bg: linear-gradient(135deg, #ff6b9d, #ff8fab);
  --btn-primary-text: #fff;
  --btn-primary-shadow: rgba(255,107,157,0.3);
  --btn-secondary-bg: #fff;
  --btn-secondary-text: #aaa;
  --btn-secondary-border: #eee;
  --washi-1: repeating-linear-gradient(45deg, #ff6b9d, #ff6b9d 3px, #ff9dc2 3px, #ff9dc2 6px);
  --washi-scrapbook: repeating-linear-gradient(-45deg, #d8b4fe, #d8b4fe 3px, #e9d5ff 3px, #e9d5ff 6px);
  --nav-active: #ff6b9d;
  --nav-inactive: #ccc;
  --reason-bg: #fff5f8;
  --reason-border: #ffd6e8;
  --reason-text: #cc6699;
  --stamp-color: #d4a0d0;
  --empty-text: #cc88aa;
}

[data-theme="dark"] {
  --bg: #1a1a2e;
  --bg-dots: transparent;
  --card-bg: #fffef2;
  --card-shadow: rgba(255,107,157,0.4);
  --card-shadow-1: transparent;
  --card-shadow-2: transparent;
  --card-shadow-scrapbook: transparent;
  --text: #333;
  --text-light: #666;
  --title: #ff6b9d;
  --subtitle: #ff9dc2;
  --btn-primary-bg: #ff6b9d;
  --btn-primary-text: #fff;
  --btn-primary-shadow: none;
  --btn-secondary-bg: #ffe066;
  --btn-secondary-text: #333;
  --btn-secondary-border: #333;
  --washi-1: repeating-linear-gradient(45deg, #ff6b9d, #ff6b9d 4px, #ff9dc2 4px, #ff9dc2 8px);
  --washi-scrapbook: repeating-linear-gradient(-45deg, #7dd3fc, #7dd3fc 4px, #a8edea 4px, #a8edea 8px);
  --nav-active: #ff6b9d;
  --nav-inactive: #555;
  --reason-bg: #2a2a3e;
  --reason-border: #ff6b9d;
  --reason-text: #ff9dc2;
  --stamp-color: #a8edea;
  --empty-text: #ff9dc2;
}

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

body {
  font-family: 'Patrick Hand', cursive;
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

body:not([data-theme="dark"]) {
  background-image: radial-gradient(circle, var(--bg-dots) 1px, transparent 1px);
  background-size: 20px 20px;
}

[data-theme="dark"] body::before,
[data-theme="dark"] body::after {
  content: '';
  position: fixed;
  border-radius: 50%;
  opacity: 0.12;
  pointer-events: none;
}
[data-theme="dark"] body::before {
  top: 10%; left: 5%; width: 60px; height: 60px;
  background: #ffd6e8; transform: rotate(5deg);
}
[data-theme="dark"] body::after {
  bottom: 15%; right: 8%; width: 50px; height: 50px;
  background: #a8edea; border-radius: 8px; transform: rotate(-12deg);
}

.page {
  max-width: 400px;
  margin: 0 auto;
  padding: 24px 16px 80px;
  min-height: 100vh;
  position: relative;
}

.header { text-align: center; margin-bottom: 20px; }
.title { font-family: 'Caveat', cursive; font-size: 2rem; color: var(--title); }
.subtitle { font-size: 0.9rem; color: var(--subtitle); }

.doodle { position: absolute; opacity: 0.5; pointer-events: none; }
.doodle-1 { top: 20px; left: 12px; font-size: 1.2rem; transform: rotate(-12deg); }
.doodle-2 { top: 20px; right: 12px; font-size: 1rem; transform: rotate(10deg); }

.card-stack { position: relative; margin: 0 4px; }

.card-shadow {
  position: absolute;
  top: 3px; left: 3px; right: -3px; bottom: -3px;
  border-radius: 8px;
}
.card-shadow-1 { background: var(--card-shadow-1); transform: rotate(2deg); }
.card-shadow-2 { background: var(--card-shadow-2); transform: rotate(-0.8deg); top: 2px; left: -2px; right: 2px; bottom: -2px; }
.card-shadow-scrapbook { background: var(--card-shadow-scrapbook); transform: rotate(1deg); opacity: 0.7; }

.card {
  position: relative;
  background: var(--card-bg);
  border-radius: 10px;
  padding: 24px 18px;
  box-shadow: 0 2px 10px var(--card-shadow);
}

[data-theme="dark"] .card {
  border: 3px solid #444;
  border-radius: 4px;
  box-shadow: 5px 5px 0 var(--card-shadow);
  transform: rotate(1deg);
  background-image: repeating-linear-gradient(transparent, transparent 27px, #e8d8f0 27px, #e8d8f0 28px);
}

.card-text {
  font-size: 1.25rem;
  color: var(--text);
  line-height: 1.5;
  text-align: center;
  margin-top: 8px;
}

.washi-tape {
  position: absolute;
  height: 14px;
  border-radius: 2px;
  opacity: 0.7;
}
.washi-tape-left {
  top: -7px; left: 20px; width: 50px;
  background: var(--washi-1);
  transform: rotate(-2deg);
}
.washi-tape-scrapbook {
  top: -7px; right: 18px; width: 45px;
  background: var(--washi-scrapbook);
  transform: rotate(2deg);
}

[data-theme="dark"] .card::after {
  content: '';
  position: absolute;
  top: -6px; right: 20px; width: 45px; height: 16px;
  background: repeating-linear-gradient(-45deg, #7dd3fc, #7dd3fc 4px, #a8edea 4px, #a8edea 8px);
  opacity: 0.8;
  transform: rotate(2deg);
}

.redeemed-stamp {
  position: absolute;
  top: 12px; right: 10px;
  font-family: 'Caveat', cursive;
  font-size: 0.75rem;
  color: var(--stamp-color);
  border: 1.5px solid var(--stamp-color);
  border-radius: 4px;
  padding: 1px 6px;
  transform: rotate(12deg);
  opacity: 0.7;
}

.reason-block {
  background: var(--reason-bg);
  border-left: 3px solid var(--reason-border);
  padding: 8px 12px;
  border-radius: 0 6px 6px 0;
  margin-top: 12px;
}
.reason-text {
  font-family: 'Caveat', cursive;
  font-size: 1rem;
  color: var(--reason-text);
  font-style: italic;
}
.redeemed-date {
  text-align: right;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--text-light);
}

.actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
  padding: 0 4px;
}

.btn {
  display: block;
  width: 100%;
  text-align: center;
  text-decoration: none;
  padding: 14px;
  font-family: 'Patrick Hand', cursive;
  font-size: 1.15rem;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-radius: 24px;
  box-shadow: 0 4px 14px var(--btn-primary-shadow);
}

[data-theme="dark"] .btn-primary {
  border: 3px solid #333;
  border-radius: 4px;
  box-shadow: 3px 3px 0 #333;
  transform: rotate(-2deg);
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border: 2px solid var(--btn-secondary-border);
  border-radius: 24px;
}

[data-theme="dark"] .btn-secondary {
  border: 3px solid #333;
  border-radius: 4px;
  box-shadow: 3px 3px 0 #333;
  transform: rotate(1deg);
}

.bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  display: flex;
  justify-content: center;
  gap: 24px;
  padding: 12px;
  background: var(--bg);
  border-top: 1px solid var(--btn-secondary-border);
}
.nav-link {
  font-family: 'Patrick Hand', cursive;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--nav-inactive);
}
.nav-link.active {
  color: var(--nav-active);
  font-weight: bold;
}

.theme-toggle {
  position: fixed;
  bottom: 8px; right: 12px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.8rem;
  opacity: 0.6;
  padding: 4px;
}
.theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="dark"] .theme-icon-dark { display: inline; }

.redeem-form {
  margin-top: 16px;
  padding: 0 4px;
}
.form-label {
  display: block;
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 6px;
}
.form-textarea {
  width: 100%;
  padding: 10px;
  border: 2px solid var(--btn-secondary-border);
  border-radius: 8px;
  font-family: 'Patrick Hand', cursive;
  font-size: 1rem;
  resize: none;
  margin-bottom: 10px;
  box-sizing: border-box;
}

.empty-state { text-align: center; margin-top: 60px; }
.empty-emoji { font-size: 3rem; margin-bottom: 12px; }
.empty-text { font-size: 1.1rem; color: var(--empty-text); }

.confetti-container {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 100;
  overflow: hidden;
}
.confetti-piece {
  position: absolute;
  top: -20px;
  font-size: 1.5rem;
  animation: confetti-fall 2s ease-in forwards;
}
@keyframes confetti-fall {
  to { top: 110vh; opacity: 0; transform: rotate(720deg); }
}