:root {
  --bg: #0d0d0d;
  --surface: #1a1a1a;
  --surface-hover: #262626;
  --text: #f5f5f5;
  --accent: #e6b800;
  --accent-hover: #f0c810;
  --disabled: #555;
  --border: #333;
  --accent-blue: #2563eb;
  --accent-purple: #7c3aed;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "header"
    "main";
}

.header {
  grid-area: header;
  padding: 1rem 1.5rem;
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.shop-trigger {
  margin-left: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.shop-trigger:hover {
  background: var(--surface-hover);
  transform: scale(1.03);
}

.shop-trigger:active {
  transform: scale(0.98);
}

.shop-trigger-icon-wrap {
  position: relative;
  line-height: 1;
}

.shop-trigger-icon {
  font-size: 2rem;
  line-height: 1;
}

.shop-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--surface);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.shop-badge.visible {
  opacity: 1;
}

.shop-trigger-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.header h1 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--accent);
}

.score-wrap {
  font-size: 1.25rem;
  font-weight: 600;
}

.cps-wrap {
  font-size: 0.95rem;
  opacity: 0.9;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.cps-line {
  white-space: nowrap;
}

.per-click-wrap {
  font-size: 0.85rem;
  opacity: 0.85;
}

.main {
  grid-area: main;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  gap: 1rem;
}

.back-link {
  position: absolute;
  top: 1rem;
  left: 1rem;
  font-size: 0.95rem;
  color: var(--text);
  text-decoration: none;
  opacity: 0.9;
  transition: opacity 0.15s;
}

.back-link:hover {
  opacity: 1;
  text-decoration: underline;
}

.kaka-btn {
  width: 200px;
  height: 200px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(145deg, #c9a600, #8b7500);
  box-shadow:
    0 8px 0 #5c5000,
    0 12px 24px rgba(0, 0, 0, 0.4),
    inset 0 2px 0 rgba(255, 255, 255, 0.15);
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.08s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.kaka-btn:hover {
  transform: scale(1.05);
  box-shadow:
    0 10px 0 #5c5000,
    0 14px 28px rgba(0, 0, 0, 0.45),
    inset 0 2px 0 rgba(255, 255, 255, 0.2);
}

.kaka-btn:active {
  transform: scale(0.98);
  box-shadow:
    0 4px 0 #5c5000,
    0 8px 16px rgba(0, 0, 0, 0.4),
    inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.kaka-emoji {
  font-size: 6rem;
  line-height: 1;
  user-select: none;
  pointer-events: none;
}

.fh-btn .fh-logo {
  width: 120px;
  height: 120px;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}

.fh-link {
  font-size: 1rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  transition: opacity 0.15s;
}

.fh-link:hover {
  opacity: 0.85;
  text-decoration: underline;
}

.shop-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.shop-modal.hidden {
  display: none;
}

.shop-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

.shop-modal-content {
  position: relative;
  width: 100%;
  max-width: 360px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
}

.shop-modal-title {
  margin: 0 2rem 1rem 0;
  font-size: 1.35rem;
  color: var(--accent);
}

.shop-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s;
}

.shop-modal-close:hover {
  background: var(--surface-hover);
}

.shop-section {
  margin-bottom: 1.5rem;
}

.shop-section h3 {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0.9;
}

.shop-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.shop-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.shop-item .name {
  font-weight: 600;
}

.shop-item .meta {
  font-size: 0.85rem;
  opacity: 0.85;
}

.shop-item button {
  margin-top: 0.25rem;
  padding: 0.4rem 0.75rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.shop-item button:hover:not(:disabled) {
  background: var(--accent-hover);
}

.shop-item button:disabled {
  background: var(--disabled);
  color: var(--text);
  cursor: not-allowed;
  opacity: 0.7;
}

.shop-section-rebirth {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 2px solid var(--border);
}

.rebirth-desc {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  opacity: 0.9;
}

.rebirth-btn {
  width: 100%;
  padding: 0.75rem 1rem;
  background: linear-gradient(145deg, #5b21b6, #4c1d95);
  color: var(--text);
  border: 2px solid #6d28d9;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.rebirth-btn:hover:not(:disabled) {
  background: linear-gradient(145deg, #6d28d9, #5b21b6);
  transform: scale(1.02);
}

.rebirth-btn:disabled {
  background: var(--bg);
  border-color: var(--disabled);
  color: var(--disabled);
  cursor: not-allowed;
  opacity: 0.8;
}

@media (max-width: 700px) {
  .shop-trigger {
    margin-left: 0;
  }
}