:root {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-muted: #555555;
  --border: #e0e0e0;
  --accent: #4a7cf7;
  --accent-hover: #3060d0;
  --tile-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --tile-shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.14);
  --header-bg: #ffffff;
}

[data-theme="dark"] {
  --bg: #121212;
  --surface: #1e1e1e;
  --text: #e8e8e8;
  --text-muted: #a0a0a0;
  --border: #333333;
  --accent: #6b9bff;
  --accent-hover: #89b0ff;
  --tile-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  --tile-shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.6);
  --header-bg: #1e1e1e;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.25s, color 0.25s;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 2rem;
  padding: 0.35rem 0.75rem;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: border-color 0.2s, background 0.2s;
}

.theme-toggle:hover {
  background: var(--border);
}

[data-theme="light"] .icon-moon,
[data-theme="dark"] .icon-sun {
  display: none;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.tile {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--tile-shadow);
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
}

.tile:hover {
  box-shadow: var(--tile-shadow-hover);
  transform: translateY(-3px);
  border-color: var(--accent);
}

.tile-icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.tile h2 {
  font-size: 1.05rem;
  font-weight: 600;
}

.tile p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Utility page shared styles */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.page-header a.back {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

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

.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.page-content h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.page-content .description {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.placeholder-box {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.guild-potions-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto;
  align-items: center;
}

.guild-potions-title {
  font-size: 1.1rem;
  text-align: center;
}

.guild-potions-header .mode-toggle--header {
  justify-self: center;
}

.mode-toggle--header {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  width: 100px;
  height: 72px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.mode-toggle--header:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.mode-toggle--header:active {
  transform: translateY(0);
}

.mode-toggle--header .mode-switch-to {
  font-size: 0.6rem;
  font-weight: 600;
  opacity: 0.85;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.mode-toggle--header .mode-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.mode-toggle--header .mode-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}