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

:root {
  /* ITO Stationery Store palette */
  --bg-primary: #f8f6f0;
  --bg-secondary: #f0ede5;
  --bg-card: #fffdf9;
  --bg-card-hover: #f0faf6;
  --bg-selected: #2a3458;

  /* ITO brand colors */
  --ink-primary: #2a3458;
  --ink-secondary: #4a5068;
  --ink-muted: #8a8fa0;
  --ink-blue: #5ec4a8;
  --ink-blue-light: #7dd8be;
  --ink-blue-pale: #e6f7f2;
  --ink-accent: #d97706;
  --ink-accent-light: #fbbf24;
  --ink-red: #dc2626;
  --ink-green: #3da88a;

  /* Typography */
  --font-main: 'Noto Sans JP', sans-serif;
  --font-display: 'Zen Maru Gothic', 'Noto Sans JP', sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 50%;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(26, 42, 58, 0.08);
  --shadow-md: 0 4px 12px rgba(26, 42, 58, 0.1);
  --shadow-lg: 0 8px 30px rgba(26, 42, 58, 0.12);
  --shadow-xl: 0 16px 50px rgba(26, 42, 58, 0.15);
  --shadow-glow: 0 0 30px rgba(94, 196, 168, 0.2);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--ink-primary);
  line-height: 1.7;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ===== Screen Management ===== */
.screen {
  display: none;
  min-height: 100dvh;
  position: relative;
}

.screen.is-active {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  33% { transform: translateY(-10px) rotate(3deg); }
  66% { transform: translateY(-5px) rotate(-2deg); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes confettiDrop {
  0% { transform: translateY(-100vh) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ===== Top Screen ===== */
.top-container {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  max-width: 440px;
  width: 100%;
  position: relative;
}

.top-deco {
  position: absolute;
  font-size: 2rem;
  opacity: 0.15;
  animation: float 6s ease-in-out infinite;
  pointer-events: none;
}

.top-deco-1 { top: 5%; left: 10%; animation-delay: 0s; }
.top-deco-2 { top: 15%; right: 8%; animation-delay: 2s; font-size: 1.5rem; }
.top-deco-3 { bottom: 20%; left: 5%; animation-delay: 4s; font-size: 1.8rem; }

.top-hero {
  margin-bottom: var(--space-2xl);
}

.top-icon-pen {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  animation: bounce 3s ease-in-out infinite;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
}

.top-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--ink-primary);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--ink-primary), #3da88a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.top-subtitle {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--ink-secondary);
  margin-bottom: var(--space-lg);
}

.top-desc {
  font-size: 0.88rem;
  color: var(--ink-muted);
  line-height: 1.8;
}

/* Start Button */
.btn-start {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: linear-gradient(135deg, #5ec4a8, #3da88a);
  color: #fff;
  border: none;
  padding: var(--space-md) var(--space-2xl);
  border-radius: var(--radius-xl);
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 6px 20px rgba(94, 196, 168, 0.4);
  position: relative;
  overflow: hidden;
}

.btn-start::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  background-size: 200% 100%;
  animation: shimmer 3s ease-in-out infinite;
}

.btn-start:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(94, 196, 168, 0.5);
}

.btn-start:active {
  transform: translateY(0);
  box-shadow: 0 4px 15px rgba(94, 196, 168, 0.4);
}

.btn-start-icon {
  font-size: 1.4rem;
}

.top-time {
  margin-top: var(--space-md);
  font-size: 0.8rem;
  color: var(--ink-muted);
}

/* ===== Question Screen ===== */
.question-container {
  width: 100%;
  max-width: 500px;
  padding: var(--space-lg);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.question-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  padding-top: var(--space-md);
}

.btn-back {
  background: none;
  border: none;
  font-size: 0.9rem;
  color: var(--ink-secondary);
  cursor: pointer;
  font-family: var(--font-main);
  transition: color var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-back:hover {
  color: var(--ink-blue);
}

.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #5ec4a8, #7dd8be);
  border-radius: 3px;
  transition: width var(--transition-normal);
  width: 20%;
}

.progress-text {
  font-size: 0.8rem;
  color: var(--ink-muted);
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.question-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  animation: slideUp 0.4s ease;
}

.question-label {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
  text-align: center;
}

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

.option-card {
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-main);
  font-size: 0.95rem;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.option-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--ink-blue);
  border-radius: 0 2px 2px 0;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.option-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--ink-blue-light);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.option-card:hover::before {
  opacity: 1;
}

.option-card.is-selected {
  background: var(--ink-blue-pale);
  border-color: var(--ink-blue);
  transform: translateX(4px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.option-card.is-selected::before {
  opacity: 1;
}

.option-emoji {
  font-size: 1.6rem;
  flex-shrink: 0;
  width: 40px;
  text-align: center;
}

.option-text {
  flex: 1;
}

.option-text-main {
  font-weight: 600;
  color: var(--ink-primary);
  display: block;
  margin-bottom: 2px;
}

.option-text-sub {
  font-size: 0.8rem;
  color: var(--ink-muted);
  display: block;
}

/* ===== Result Screen ===== */
.result-container {
  width: 100%;
  max-width: 500px;
  padding: var(--space-xl) var(--space-lg);
  margin: 0 auto;
  position: relative;
}

.result-confetti {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  width: 10px;
  height: 10px;
  top: -20px;
  animation: confettiDrop 3s ease-in forwards;
}

/* Result Type Card */
.result-type-card {
  background: linear-gradient(135deg, var(--bg-card), #eef8f4);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--space-xl);
  animation: scaleIn 0.5s ease;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(94, 196, 168, 0.12);
}

.result-type-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(94, 196, 168, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.result-type-emoji {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  animation: bounce 2s ease-in-out infinite;
}

.result-type-name {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--ink-primary);
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--ink-primary), #3da88a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-type-desc {
  font-size: 0.95rem;
  color: var(--ink-secondary);
  line-height: 1.8;
}

/* Result Section */
.result-section {
  margin-bottom: var(--space-xl);
}

.result-section-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: var(--space-md);
  padding-left: var(--space-xs);
}

.result-pens {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Pen Card */
.pen-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  animation: slideUp 0.5s ease;
  transition: all var(--transition-normal);
  border: 1px solid rgba(0,0,0,0.04);
}

.pen-card:nth-child(1) { animation-delay: 0.1s; }
.pen-card:nth-child(2) { animation-delay: 0.2s; }
.pen-card:nth-child(3) { animation-delay: 0.3s; }

.pen-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.pen-card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.pen-rank {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.pen-rank-1 { background: linear-gradient(135deg, #f59e0b, #d97706); }
.pen-rank-2 { background: linear-gradient(135deg, #9ca3af, #6b7280); }
.pen-rank-3 { background: linear-gradient(135deg, #b45309, #92400e); }

.pen-info { flex: 1; }

.pen-maker {
  font-size: 0.72rem;
  color: var(--ink-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.pen-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin: 2px 0;
}

.pen-price {
  font-size: 0.8rem;
  color: var(--ink-blue);
  font-weight: 600;
}

.pen-desc {
  font-size: 0.85rem;
  color: var(--ink-secondary);
  line-height: 1.7;
  margin-top: var(--space-sm);
}

.pen-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.pen-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--ink-blue-pale);
  color: var(--ink-blue);
  font-weight: 500;
}

/* Result Tip */
.result-tip {
  background: linear-gradient(135deg, #fffbeb, #fef3c7);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
  border-left: 4px solid var(--ink-accent);
  animation: slideUp 0.5s ease 0.4s both;
}

.result-tip-title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink-accent);
  margin-bottom: var(--space-xs);
}

.result-tip-text {
  font-size: 0.85rem;
  color: var(--ink-secondary);
  line-height: 1.7;
}

/* Result Actions */
.result-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding-bottom: var(--space-2xl);
}

.btn {
  border: none;
  font-family: var(--font-display);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-normal);
  border-radius: var(--radius-md);
  text-align: center;
}

.btn-retry {
  background: linear-gradient(135deg, #5ec4a8, #3da88a);
  color: #fff;
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  box-shadow: 0 6px 20px rgba(94, 196, 168, 0.35);
}

.btn-retry:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(94, 196, 168, 0.45);
}

.btn-share {
  background: var(--bg-card);
  color: var(--ink-secondary);
  padding: var(--space-md) var(--space-xl);
  font-size: 0.95rem;
  border: 1px solid rgba(0,0,0,0.08);
}

.btn-share:hover {
  background: var(--bg-secondary);
  color: var(--ink-primary);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: -60px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink-primary);
  color: #fff;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  font-weight: 500;
  transition: bottom var(--transition-normal);
  z-index: 100;
  box-shadow: var(--shadow-lg);
  white-space: nowrap;
}

.toast.is-visible {
  bottom: var(--space-xl);
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  .top-title {
    font-size: 1.8rem;
  }

  .top-subtitle {
    font-size: 1rem;
  }

  .question-label {
    font-size: 1.15rem;
  }

  .result-type-name {
    font-size: 1.4rem;
  }

  .btn-start {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.1rem;
  }
}

@media (min-width: 768px) {
  .top-title {
    font-size: 2.8rem;
  }

  .question-container {
    min-height: auto;
    padding: var(--space-3xl) var(--space-lg);
  }

  .question-body {
    padding: var(--space-xl) 0;
  }
}

/* ===== Paper texture overlay ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

.screen {
  position: relative;
  z-index: 1;
}