/* ===========================
   OneTime — Tema Washi + Sakura
   Papéis antigos japoneses, cerejeiras, efemeridade
   =========================== */

:root {
  /* Washi paper palette */
  --washi-bg: #f5efe0;
  --washi-cream: #ece4d0;
  --washi-warm: #ddd2ba;
  --ink-dark: #2c1810;
  --ink-medium: #4a3628;
  --ink-light: #7a6552;
  --sakura-pink: #f2b5c8;
  --sakura-deep: #d4829a;
  --sakura-pale: #fce4ec;
  --sakura-blush: #f8cad7;
  --seal-red: #b33030;
  --seal-red-dark: #8a2020;
  --gold-accent: #c4a265;
  --burn-orange: #e85d04;
  --burn-red: #d00000;
  --burn-dark: #370617;
  --ash-gray: #6b6b6b;

  /* Typography */
  --font-jp: 'Noto Serif JP', 'Shippori Mincho', serif;
  --font-body: 'Shippori Mincho', 'Noto Serif JP', Georgia, serif;

  /* Spacing */
  --container-max: 680px;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
}

/* ===== Reset ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ===== Base ===== */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--washi-bg);
  color: var(--ink-dark);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.7;
}

/* Washi paper texture overlay */
.washi-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.08;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(139, 119, 90, 0.3) 2px,
      rgba(139, 119, 90, 0.3) 3px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 3px,
      rgba(139, 119, 90, 0.15) 3px,
      rgba(139, 119, 90, 0.15) 4px
    );
}

/* ===== Sakura Petals ===== */
.sakura-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

/* Petal base */
.sakura-petal {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--sakura-pink);
  border-radius: 50% 0 50% 50%;
  opacity: 0;
  top: -20px;
  animation: sakuraFall linear forwards;
  filter: blur(0.3px);
}

.sakura-petal::after {
  content: '';
  position: absolute;
  inset: 2px;
  background: var(--sakura-pale);
  border-radius: 50% 0 50% 50%;
  opacity: 0.6;
}

/* Petal shape variants */
.sakura-petal.petal-round {
  border-radius: 50%;
}

.sakura-petal.petal-round::after {
  border-radius: 50%;
}

.sakura-petal.petal-thin {
  border-radius: 80% 0 80% 0;
  transform: scaleX(0.6);
}

.sakura-petal.petal-thin::after {
  border-radius: 80% 0 80% 0;
}

.sakura-petal.petal-wide {
  border-radius: 40% 0 40% 50%;
}

.sakura-petal.petal-wide::after {
  border-radius: 40% 0 40% 50%;
}

/* Petal color variants — harmonious sakura pinks */
.sakura-petal.color-blush {
  background: var(--sakura-blush);
}
.sakura-petal.color-blush::after {
  background: #fde8ef;
}

.sakura-petal.color-deep {
  background: var(--sakura-deep);
}
.sakura-petal.color-deep::after {
  background: var(--sakura-pink);
}

.sakura-petal.color-white {
  background: #fce8f0;
}
.sakura-petal.color-white::after {
  background: #fff0f5;
}

.sakura-petal.color-rose {
  background: #e9a0b4;
}
.sakura-petal.color-rose::after {
  background: #f5c6d4;
}

/* Fall animations — multiple paths for variety */
@keyframes sakuraFall {
  0% {
    opacity: 0;
    transform: translateX(0) rotate(0deg) scale(0.8);
  }
  10% {
    opacity: 0.8;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    opacity: 0;
    transform: translateX(var(--drift, 80px)) rotate(var(--spin, 360deg)) scale(0.4);
    top: 105vh;
  }
}

@keyframes sakuraFall2 {
  0% {
    opacity: 0;
    transform: translateX(0) rotate(0deg) scale(0.9);
  }
  8% { opacity: 0.7; }
  25% {
    transform: translateX(calc(var(--drift, 60px) * 0.3)) rotate(90deg) scale(0.85);
  }
  50% {
    transform: translateX(calc(var(--drift, 60px) * -0.2)) rotate(200deg) scale(0.7);
    top: 50vh;
  }
  75% {
    transform: translateX(calc(var(--drift, 60px) * 0.6)) rotate(300deg) scale(0.55);
  }
  100% {
    opacity: 0;
    transform: translateX(var(--drift, 60px)) rotate(var(--spin, 420deg)) scale(0.3);
    top: 108vh;
  }
}

@keyframes sakuraFall3 {
  0% {
    opacity: 0;
    transform: translateX(0) rotate(0deg) scale(1);
  }
  5% { opacity: 0.6; }
  30% {
    transform: translateX(calc(var(--drift, 40px) * 0.5)) rotate(60deg) scale(0.9);
    top: 25vh;
  }
  35% {
    /* pause / flutter */
    transform: translateX(calc(var(--drift, 40px) * 0.55)) rotate(70deg) scale(0.88);
    top: 28vh;
  }
  60% {
    transform: translateX(calc(var(--drift, 40px) * -0.3)) rotate(180deg) scale(0.65);
  }
  85% { opacity: 0.5; }
  100% {
    opacity: 0;
    transform: translateX(calc(var(--drift, 40px) * 0.8)) rotate(var(--spin, 380deg)) scale(0.25);
    top: 106vh;
  }
}

/* ===== Snowflakes ===== */
.snowflake {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  opacity: 0;
  top: -10px;
  pointer-events: none;
  box-shadow: 0 0 3px rgba(255, 255, 255, 0.4);
  animation: snowFall linear forwards;
}

.snowflake.snow-large {
  width: 6px;
  height: 6px;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.5);
}

.snowflake.snow-tiny {
  width: 2px;
  height: 2px;
  box-shadow: none;
}

.snowflake.snow-crystal {
  width: 8px;
  height: 8px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 0;
  transform: rotate(45deg);
  box-shadow: 0 0 4px rgba(255, 255, 255, 0.3);
}

@keyframes snowFall {
  0% {
    opacity: 0;
    transform: translateX(0) rotate(0deg);
  }
  8% { opacity: var(--snow-opacity, 0.7); }
  50% {
    transform: translateX(var(--snow-drift, 30px)) rotate(180deg);
  }
  85% { opacity: var(--snow-opacity, 0.5); }
  100% {
    opacity: 0;
    transform: translateX(calc(var(--snow-drift, 30px) * -0.5)) rotate(360deg);
    top: 105vh;
  }
}

@keyframes snowFall2 {
  0% {
    opacity: 0;
    transform: translateX(0);
  }
  10% { opacity: var(--snow-opacity, 0.6); }
  30% {
    transform: translateX(calc(var(--snow-drift, 20px) * 0.4));
  }
  60% {
    transform: translateX(calc(var(--snow-drift, 20px) * -0.6));
  }
  90% { opacity: var(--snow-opacity, 0.4); }
  100% {
    opacity: 0;
    transform: translateX(var(--snow-drift, 20px));
    top: 107vh;
  }
}

/* ===== Header ===== */
.site-header {
  position: relative;
  z-index: 10;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--washi-warm);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--ink-dark);
}

.logo-icon {
  font-size: 1.3rem;
}

.logo-text {
  font-family: var(--font-jp);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.header-nav {
  display: flex;
  gap: var(--space-lg);
}

.header-nav a {
  font-size: 0.85rem;
  color: var(--ink-light);
  text-decoration: none;
  transition: color 0.3s;
}

.header-nav a:hover {
  color: var(--sakura-deep);
}

/* ===== Container ===== */
.container {
  position: relative;
  z-index: 5;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ===== Views ===== */
.view {
  display: none;
  animation: fadeIn 0.6s ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: var(--space-md) 0 var(--space-lg);
}

.title-jp {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.title-kanji {
  font-family: var(--font-jp);
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 300;
  letter-spacing: 0.3em;
  color: var(--ink-dark);
  text-shadow: 0 2px 8px rgba(44, 24, 16, 0.08);
}

.title-sub {
  font-size: 0.85rem;
  color: var(--ink-light);
  letter-spacing: 0.15em;
  font-weight: 400;
}

.subtitle {
  margin-top: var(--space-md);
  font-size: 1rem;
  color: var(--ink-medium);
  font-weight: 400;
}

/* ===== Letter / Card ===== */
.letter-container {
  perspective: 1200px;
  margin: var(--space-lg) 0;
}

.letter {
  position: relative;
  background:
    linear-gradient(135deg, var(--washi-cream) 0%, var(--washi-bg) 50%, var(--washi-cream) 100%);
  border: 1px solid var(--washi-warm);
  border-radius: 4px;
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  box-shadow:
    0 2px 20px rgba(44, 24, 16, 0.06),
    0 1px 3px rgba(44, 24, 16, 0.08),
    inset 0 0 60px rgba(236, 228, 208, 0.5);
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.8s ease;
  transform-origin: center center;
}

/* Torn edge effect on top */
.letter::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 10%;
  right: 10%;
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--washi-warm) 10%,
    transparent 20%,
    var(--washi-warm) 30%,
    transparent 40%,
    var(--washi-warm) 55%,
    transparent 65%,
    var(--washi-warm) 75%,
    transparent 85%,
    var(--washi-warm) 95%,
    transparent 100%
  );
  opacity: 0.5;
}

/* Sealing animation — paper folds shut */
.letter.sealing {
  animation: sealLetter 0.9s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes sealLetter {
  0% {
    transform: perspective(800px) rotateX(0deg) scale(1);
    max-height: 500px;
  }
  25% {
    transform: perspective(800px) rotateX(-8deg) scale(0.97);
    box-shadow: 0 12px 40px rgba(44, 24, 16, 0.18);
  }
  50% {
    transform: perspective(800px) rotateX(3deg) scale(0.94);
  }
  100% {
    transform: perspective(800px) rotateX(0deg) scale(0.85);
    max-height: 80px;
    box-shadow: 0 2px 10px rgba(44, 24, 16, 0.25);
  }
}

/* After seal — shrink and fade */
.letter.sealed-done {
  transition: all 0.4s ease-out;
  transform: perspective(800px) rotateX(0deg) scale(0.7);
  opacity: 0;
  max-height: 0;
  padding: 0;
  margin: 0;
  overflow: hidden;
}

/* Wax seal */
.wax-seal {
  position: absolute;
  top: -18px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: radial-gradient(circle at 35% 35%, var(--seal-red), var(--seal-red-dark));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 3px 8px rgba(0, 0, 0, 0.3),
    inset 0 -2px 4px rgba(0, 0, 0, 0.2),
    inset 0 2px 4px rgba(255, 255, 255, 0.1);
  opacity: 0;
  transform: scale(0) rotate(-30deg);
  transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 2;
}

.wax-seal.visible {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.seal-kanji {
  color: rgba(255, 255, 255, 0.85);
  font-family: var(--font-jp);
  font-size: 1.2rem;
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Letter inner */
.letter-inner {
  transition: opacity 0.5s ease;
}

.letter.sealed .letter-inner {
  opacity: 0;
  pointer-events: none;
}

.letter-header {
  margin-bottom: var(--space-md);
}

.brush-stroke {
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--ink-dark) 5%,
    var(--ink-dark) 40%,
    var(--ink-medium) 70%,
    transparent 100%
  );
  border-radius: 2px;
  margin-bottom: var(--space-sm);
  opacity: 0.3;
}

.letter-label {
  font-family: var(--font-jp);
  font-size: 0.8rem;
  color: var(--ink-light);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Textarea */
.secret-input {
  width: 100%;
  min-height: 120px;
  padding: var(--space-md);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink-dark);
  background: rgba(255, 255, 255, 0.3);
  border: 1px solid var(--washi-warm);
  border-radius: 3px;
  resize: vertical;
  line-height: 1.8;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.secret-input::placeholder {
  color: var(--ink-light);
  opacity: 0.6;
  font-style: italic;
}

.secret-input:focus {
  outline: none;
  border-color: var(--sakura-deep);
  box-shadow: 0 0 0 3px rgba(200, 107, 143, 0.1);
}

/* Options */
.letter-options {
  display: flex;
  gap: var(--space-lg);
  margin-top: var(--space-md);
  flex-wrap: wrap;
}

.option-group {
  flex: 1;
  min-width: 180px;
}

.option-group label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8rem;
  color: var(--ink-light);
  margin-bottom: var(--space-xs);
  letter-spacing: 0.05em;
}

.option-group label svg {
  stroke: var(--ink-light);
}

.option-group select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink-dark);
  background: rgba(255, 255, 255, 0.4);
  border: 1px solid var(--washi-warm);
  border-radius: 3px;
  cursor: pointer;
  transition: border-color 0.3s;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%237a6552' fill='none' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.option-group select:focus {
  outline: none;
  border-color: var(--sakura-deep);
}

/* Char count */
.char-count {
  text-align: right;
  font-size: 0.75rem;
  color: var(--ink-light);
  margin-top: var(--space-xs);
  opacity: 0.7;
}

/* ===== Buttons ===== */
.btn-seal {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-jp);
  font-size: 1rem;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(135deg, var(--seal-red) 0%, var(--seal-red-dark) 100%);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 0.1em;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(179, 48, 48, 0.25);
}

.btn-seal:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(179, 48, 48, 0.35);
}

.btn-seal:active {
  transform: translateY(0);
}

.btn-seal:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  font-size: 1.1rem;
}

/* ===== Sealed View ===== */
.sealed-card {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  margin: var(--space-xl) 0;
  background: linear-gradient(135deg, var(--washi-cream) 0%, var(--washi-bg) 100%);
  border: 1px solid var(--washi-warm);
  border-radius: 4px;
  box-shadow: 0 2px 20px rgba(44, 24, 16, 0.06);
  position: relative;
  overflow: hidden;
  animation: fadeIn 0.6s ease;
}

.sealed-stamp {
  position: absolute;
  top: 16px;
  right: 20px;
  width: 50px;
  height: 50px;
  border: 3px solid var(--seal-red);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(15deg);
  opacity: 0.3;
}

.stamp-kanji {
  font-family: var(--font-jp);
  font-size: 1.5rem;
  color: var(--seal-red);
  font-weight: 600;
}

.sealed-title {
  font-family: var(--font-jp);
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: var(--space-md);
  color: var(--ink-dark);
}

.sealed-desc {
  font-size: 0.9rem;
  color: var(--ink-medium);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.sealed-desc strong {
  color: var(--seal-red);
}

/* Link box */
.link-box {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.secret-link {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  font-family: 'Courier New', monospace;
  font-size: 0.8rem;
  color: var(--ink-dark);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--washi-warm);
  border-radius: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-copy {
  padding: var(--space-sm) var(--space-md);
  background: var(--washi-cream);
  border: 1px solid var(--washi-warm);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.3s;
  color: var(--ink-medium);
  display: flex;
  align-items: center;
}

.btn-copy:hover {
  background: var(--sakura-pale);
  border-color: var(--sakura-pink);
}

.btn-copy.copied {
  background: var(--sakura-deep);
  border-color: var(--sakura-deep);
  color: #fff;
}

.btn-new {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-jp);
  font-size: 0.9rem;
  color: var(--ink-medium);
  background: transparent;
  border: 1px solid var(--washi-warm);
  border-radius: 3px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s;
}

.btn-new:hover {
  border-color: var(--sakura-deep);
  color: var(--sakura-deep);
}

/* ===== Reveal View ===== */
.reveal-card {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  margin: var(--space-xl) 0;
  background: linear-gradient(135deg, var(--washi-cream) 0%, var(--washi-bg) 100%);
  border: 1px solid var(--washi-warm);
  border-radius: 4px;
  box-shadow: 0 2px 20px rgba(44, 24, 16, 0.06);
  animation: fadeIn 0.6s ease;
}

.reveal-seal {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--space-md);
  background: radial-gradient(circle at 35% 35%, var(--seal-red), var(--seal-red-dark));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.2);
}

.reveal-seal .seal-kanji {
  font-size: 1.5rem;
}

.reveal-title {
  font-family: var(--font-jp);
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.reveal-desc {
  font-size: 0.9rem;
  color: var(--ink-medium);
  margin-bottom: var(--space-lg);
}

.reveal-desc strong {
  color: var(--seal-red);
}

.btn-reveal {
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-jp);
  font-size: 1rem;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(135deg, var(--sakura-deep) 0%, var(--seal-red) 100%);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 0.1em;
  transition: all 0.3s;
  box-shadow: 0 2px 8px rgba(199, 107, 143, 0.3);
}

.btn-reveal:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(199, 107, 143, 0.4);
}

.reveal-content {
  margin-top: var(--space-lg);
  text-align: left;
  animation: unfold 0.6s ease;
}

@keyframes unfold {
  from {
    opacity: 0;
    max-height: 0;
    transform: scaleY(0.8);
  }
  to {
    opacity: 1;
    max-height: 500px;
    transform: scaleY(1);
  }
}

.revealed-text {
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.4);
  border: 1px solid var(--washi-warm);
  border-radius: 3px;
  font-size: 1rem;
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink-dark);
}

.reveal-warning {
  margin-top: var(--space-md);
  font-size: 0.75rem;
  color: var(--ink-light);
  font-style: italic;
  text-align: center;
}

/* ===== Burned View ===== */
.burned-card {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  margin: var(--space-xl) 0;
  background: linear-gradient(135deg, var(--washi-cream) 0%, var(--washi-bg) 100%);
  border: 1px solid var(--washi-warm);
  border-radius: 4px;
  box-shadow: 0 2px 20px rgba(44, 24, 16, 0.06);
  position: relative;
  overflow: hidden;
  animation: fadeIn 0.6s ease;
}

.burned-title {
  font-family: var(--font-jp);
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: var(--space-md);
  color: var(--ink-dark);
}

.burned-desc {
  font-size: 0.9rem;
  color: var(--ink-medium);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

/* Burn effect overlay */
.burn-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0;
}

.burned-card.burning .burn-overlay {
  animation: burnEffect 2.5s ease-in-out forwards;
}

@keyframes burnEffect {
  0% {
    opacity: 0;
    background: transparent;
  }
  20% {
    opacity: 1;
    background:
      radial-gradient(ellipse at bottom left, rgba(232, 93, 4, 0.6) 0%, transparent 50%),
      radial-gradient(ellipse at bottom right, rgba(208, 0, 0, 0.4) 0%, transparent 40%);
  }
  50% {
    background:
      radial-gradient(ellipse at bottom left, rgba(232, 93, 4, 0.8) 0%, transparent 60%),
      radial-gradient(ellipse at bottom right, rgba(208, 0, 0, 0.6) 0%, transparent 50%),
      radial-gradient(ellipse at top center, rgba(55, 6, 23, 0.3) 0%, transparent 40%);
  }
  80% {
    background:
      radial-gradient(ellipse at center, rgba(55, 6, 23, 0.7) 0%, transparent 70%),
      radial-gradient(ellipse at bottom, rgba(232, 93, 4, 0.4) 0%, transparent 60%);
  }
  100% {
    opacity: 0.8;
    background: radial-gradient(ellipse at center, rgba(55, 6, 23, 0.5) 0%, rgba(44, 24, 16, 0.1) 100%);
  }
}

/* Burn edges — charred paper effect */
.burned-card.burning::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 3px solid transparent;
  border-radius: 4px;
  animation: burnEdges 2.5s ease-in-out forwards;
  pointer-events: none;
  z-index: 2;
}

@keyframes burnEdges {
  0% {
    border-color: transparent;
    box-shadow: none;
  }
  30% {
    border-color: var(--burn-orange);
    box-shadow:
      inset 0 0 15px rgba(232, 93, 4, 0.3),
      0 0 8px rgba(232, 93, 4, 0.2);
  }
  60% {
    border-color: var(--burn-red);
    box-shadow:
      inset 0 0 25px rgba(208, 0, 0, 0.3),
      inset 0 0 50px rgba(55, 6, 23, 0.2),
      0 0 12px rgba(208, 0, 0, 0.2);
  }
  100% {
    border-color: var(--burn-dark);
    box-shadow:
      inset 0 0 40px rgba(55, 6, 23, 0.4),
      inset 0 0 80px rgba(44, 24, 16, 0.2);
  }
}

/* Ash particles */
.ash-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}

.ash-particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--ash-gray);
  border-radius: 50%;
  opacity: 0;
  animation: ashFloat 2s ease-out forwards;
}

@keyframes ashFloat {
  0% {
    opacity: 0;
    transform: translateY(0) rotate(0deg);
  }
  20% {
    opacity: 0.8;
  }
  100% {
    opacity: 0;
    transform: translateY(-60px) translateX(var(--ash-drift, 20px)) rotate(180deg);
  }
}

/* Ember glow particles */
.ember {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--burn-orange);
  border-radius: 50%;
  opacity: 0;
  box-shadow: 0 0 4px var(--burn-orange), 0 0 8px rgba(232, 93, 4, 0.5);
  animation: emberGlow 1.5s ease-out forwards;
}

@keyframes emberGlow {
  0% {
    opacity: 0;
    transform: scale(0);
  }
  30% {
    opacity: 1;
    transform: scale(1.5);
  }
  100% {
    opacity: 0;
    transform: scale(0) translateY(-30px);
  }
}

/* ===== How it works ===== */
.how-it-works {
  margin: var(--space-xl) 0;
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--washi-warm);
}

.how-it-works h2 {
  font-family: var(--font-jp);
  font-size: 1.3rem;
  font-weight: 500;
  text-align: center;
  margin-bottom: var(--space-lg);
  color: var(--ink-dark);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-lg);
}

.step {
  text-align: center;
}

.step-icon {
  font-size: 1.8rem;
  margin-bottom: var(--space-sm);
}

.step h3 {
  font-family: var(--font-jp);
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--ink-dark);
}

.step p {
  font-size: 0.8rem;
  color: var(--ink-light);
  line-height: 1.6;
}

/* ===== Ad ===== */
.ad-container {
  max-width: var(--container-max);
  margin: var(--space-lg) auto;
  padding: 0 var(--space-lg);
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  z-index: 5;
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  border-top: 1px solid var(--washi-warm);
  text-align: center;
}

.footer-haiku {
  font-family: var(--font-jp);
  font-size: 0.85rem;
  color: var(--ink-light);
  line-height: 2;
  margin-bottom: var(--space-md);
  opacity: 0.7;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
  font-size: 0.8rem;
}

.footer-nav a {
  color: var(--ink-light);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-nav a:hover {
  color: var(--sakura-deep);
}

/* ===== Legal Pages ===== */
.page-legal {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
}

.page-title {
  font-family: var(--font-jp);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--ink-dark);
}

.page-date {
  font-size: 0.8rem;
  color: var(--ink-light);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--washi-warm);
}

.page-date a {
  color: var(--sakura-deep);
  text-decoration: none;
}

.page-legal h2 {
  font-family: var(--font-jp);
  font-size: 1.15rem;
  font-weight: 500;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--ink-dark);
}

.page-legal p {
  color: var(--ink-medium);
  line-height: 1.8;
  margin-bottom: var(--space-sm);
}

.page-legal ul,
.page-legal ol {
  color: var(--ink-medium);
  padding-left: 1.5rem;
  margin-bottom: var(--space-sm);
  line-height: 1.8;
}

.page-legal li {
  margin-bottom: var(--space-xs);
}

.page-legal strong {
  color: var(--ink-dark);
}

.page-legal a {
  color: var(--sakura-deep);
  text-decoration: none;
}

.page-legal a:hover {
  text-decoration: underline;
}

/* ===== Utilities ===== */
.hidden {
  display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .container {
    padding: 0 var(--space-md);
  }

  .letter {
    padding: var(--space-md);
  }

  .letter-options {
    flex-direction: column;
    gap: var(--space-md);
  }

  .hero {
    padding: var(--space-lg) 0 var(--space-md);
  }

  .title-kanji {
    letter-spacing: 0.15em;
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .link-box {
    flex-direction: column;
  }
}