:root {
    --color-primary: #1a73e8;
    --color-primary-dark: #1558b0;
    --color-bg: #f6f8fc;
    --color-surface: #ffffff;
    --color-border: #dadce0;
    --color-text: #202124;
    --color-text-muted: #5f6368;
    --color-available: #e6f4ea;
    --color-available-text: #137333;
    --color-unavailable: #f1f3f4;
    --color-danger: #d93025;
    --radius: 8px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Hiragino Sans", "Yu Gothic", "Segoe UI", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 16px 64px;
}

.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.site-header .container {
    padding-top: 0;
    padding-bottom: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-header h1 {
    font-size: 20px;
    margin: 0;
}

.site-header a {
    color: var(--color-text);
    text-decoration: none;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}

.facility-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.facility-card {
    display: block;
    text-decoration: none;
    color: inherit;
}

.facility-card h2 {
    font-size: 18px;
    margin: 0 0 8px;
    color: var(--color-primary);
}

.facility-card p {
    color: var(--color-text-muted);
    font-size: 14px;
    margin: 0;
}

.btn {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 10px 20px;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
}

.btn:hover { background: var(--color-primary-dark); }

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-danger {
    background: var(--color-danger);
}

.btn-block { display: block; width: 100%; text-align: center; }

.btn[disabled], .btn:disabled {
    background: var(--color-unavailable);
    color: var(--color-text-muted);
    cursor: not-allowed;
}

/* カレンダー */
.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.calendar-header h3 { margin: 0; font-size: 16px; }

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.calendar-weekday {
    text-align: center;
    font-size: 12px;
    color: var(--color-text-muted);
    padding: 4px 0;
}

.calendar-day {
    position: relative;
    aspect-ratio: 1 / 1;
    border-radius: 6px;
    border: 1px solid transparent;
    background: var(--color-unavailable);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    cursor: default;
    color: var(--color-text-muted);
}

.calendar-day.empty { background: transparent; }

.calendar-day.available {
    background: var(--color-available);
    color: var(--color-available-text);
    cursor: pointer;
    font-weight: 600;
}

.calendar-day.available:hover {
    border-color: var(--color-primary);
}

.calendar-day.selected {
    background: var(--color-primary);
    color: #fff;
}

.calendar-day.today {
    box-shadow: inset 0 0 0 2px var(--color-primary);
}

.calendar-day.has-booking::after {
    content: "";
    position: absolute;
    bottom: 5px;
    left: 50%;
    width: 6px;
    height: 6px;
    margin-left: -3px;
    border-radius: 50%;
    background: #f29900;
}

.calendar-day.has-booking { cursor: pointer; }
.calendar-day.selected.has-booking::after { background: #fff; }

.booked-box {
    background: #fef7e0;
    border: 1px solid #f9e2a3;
    border-radius: 6px;
    padding: 10px 14px;
    margin: 12px 0;
    font-size: 14px;
}

.booked-box .booked-title { margin: 0 0 4px; font-weight: 600; }
.booked-box ul { margin: 0; padding-left: 20px; }

.time-range {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.time-range .form-row { min-width: 140px; margin-bottom: 0; }

.slot-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 8px;
    margin-top: 16px;
}

.slot-btn {
    padding: 10px 4px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: #fff;
    cursor: pointer;
    font-size: 14px;
    text-align: center;
}

.slot-btn:hover { border-color: var(--color-primary); }

.slot-btn.selected {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.slot-btn:disabled {
    background: var(--color-unavailable);
    color: var(--color-text-muted);
    cursor: not-allowed;
}

form .form-row { margin-bottom: 16px; }

label { display: block; font-size: 13px; margin-bottom: 4px; color: var(--color-text-muted); }

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="time"],
select,
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
}

textarea { min-height: 80px; resize: vertical; }

.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error { background: #fce8e6; color: var(--color-danger); }
.alert-success { background: var(--color-available); color: var(--color-available-text); }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--color-border); }
th { color: var(--color-text-muted); font-weight: 600; }

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
}

.badge-confirmed { background: var(--color-available); color: var(--color-available-text); }
.badge-cancelled { background: var(--color-unavailable); color: var(--color-text-muted); }

.admin-nav { display: flex; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.admin-nav a { color: var(--color-text); text-decoration: none; padding: 8px 12px; border-radius: 4px; }
.admin-nav a.active, .admin-nav a:hover { background: var(--color-available); color: var(--color-primary); }

.filters { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; align-items: end; }
.filters .form-row { margin-bottom: 0; min-width: 150px; }

.hours-table input[type="time"] { width: 110px; }
.text-muted { color: var(--color-text-muted); font-size: 13px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

@media (max-width: 480px) {
    .calendar-day { font-size: 12px; }
    .slot-list { grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); }
}