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

:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --accent: #4f6df5;
  --accent-soft: #e3e9ff;
  --free: #d3f2dd;
  --free-border: #3fa96b;
  --pick: #ffe9b8;
  --pick-border: #e0a63b;
}

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

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: linear-gradient(120deg, #4f6df5, #7b5cf0);
  color: #fff;
}
header h1 { font-size: 1.25rem; }
#user-box { display: flex; align-items: center; gap: 12px; }

main { max-width: 760px; margin: 24px auto; padding: 0 16px; }

.card {
  background: var(--card);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 2px 10px rgba(20, 25, 45, 0.08);
}

.auth-card { max-width: 380px; margin: 48px auto; text-align: center; }
.auth-card h2 { margin-bottom: 6px; }
.auth-card form { display: flex; flex-direction: column; gap: 10px; margin: 18px 0 10px; }

input {
  padding: 10px 12px;
  border: 1px solid #d4d7de;
  border-radius: 8px;
  font-size: 1rem;
}
input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

button {
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
}
button:hover { filter: brightness(1.08); }
button.ghost {
  background: transparent;
  color: inherit;
  border: 1px solid rgba(127, 134, 152, 0.45);
}
header button.ghost { color: #fff; border-color: rgba(255, 255, 255, 0.6); }

.muted { color: var(--muted); font-size: 0.9rem; }
.center { text-align: center; margin-bottom: 12px; }
.error { color: #c0392b; font-size: 0.9rem; }
.hidden { display: none !important; }
a { color: var(--accent); }

.cal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.weekdays, .grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}
.weekdays div {
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
  padding: 4px 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.day {
  min-height: 72px;
  border: 1px solid #e2e5ec;
  border-radius: 10px;
  padding: 6px;
  cursor: pointer;
  position: relative;
  background: #fafbfc;
  transition: background 0.12s, border-color 0.12s;
}
.day:hover { border-color: var(--accent); }
.day.empty { background: transparent; border: none; cursor: default; }
.day.past { opacity: 0.55; }
.day .num { font-size: 0.8rem; font-weight: 600; }
.day.weekend .num { color: var(--accent); }
.day.mine { background: var(--free); border-color: var(--free-border); }
.day.pick { background: var(--pick); border-color: var(--pick-border); }
.day.pick::after { content: "🎉"; position: absolute; top: 4px; right: 6px; font-size: 0.8rem; }

.chips { display: flex; flex-wrap: wrap; gap: 3px; margin-top: 4px; }
.chip {
  background: var(--accent-soft);
  color: #37478f;
  border-radius: 999px;
  font-size: 0.65rem;
  padding: 1px 6px;
  font-weight: 600;
}

.legend {
  display: flex;
  gap: 18px;
  justify-content: center;
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--muted);
}
.swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  vertical-align: -2px;
  margin-right: 4px;
}
.mine-swatch { background: var(--free); border: 1px solid var(--free-border); }
.pick-swatch { background: var(--pick); border: 1px solid var(--pick-border); }

.actions { text-align: center; margin-top: 16px; }

#invitations { margin-bottom: 16px; }
.invite {
  background: linear-gradient(120deg, #fff7e3, #ffefc8);
  border: 1px solid var(--pick-border);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
}
.invite strong { display: block; margin-bottom: 2px; }

#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(80px);
  background: #1f2430;
  color: #fff;
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 0.9rem;
  max-width: 90%;
  box-shadow: 0 6px 20px rgba(20, 25, 45, 0.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 50;
}
#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 520px) {
  .day { min-height: 56px; padding: 4px; }
  .chip { font-size: 0.55rem; }
}