:root {
    --bg-color: #f4f7f6;
    --container-bg: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #7a8288;
    --accent-color: #4a90e2;
    --accent-hover: #357abd;
    --border-color: #e1e4e8;
    --slot-available: #e9ecef;
    --slot-selected: #4a90e2;
    --slot-pending: #f39c12;
    --slot-approved: #2ecc71;
    --slot-rejected: #e74c3c;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    --nav-bg: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
    --accent-color: #5b9bd5;
    --accent-hover: #75b3ed;
    --border-color: #333333;
    --slot-available: #2c2c2c;
    --slot-selected: #5b9bd5;
    --slot-pending: #d68910;
    --slot-approved: #27ae60;
    --slot-rejected: #c0392b;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --nav-bg: rgba(30, 30, 30, 0.9);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg-color); color: var(--text-primary);
    line-height: 1.6; transition: background-color 0.3s, color 0.3s;
}
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.hidden { display: none !important; }

/* Navbar */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background-color: var(--nav-bg); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color); padding: 15px 0;
}
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 800; }
.logo span { color: var(--accent-color); }
.nav-actions { display: flex; gap: 15px; align-items: center; }

.admin-toggle-btn {
    background-color: var(--bg-color); border: 1px solid var(--border-color);
    color: var(--text-primary); padding: 8px 15px; border-radius: 8px;
    cursor: pointer; font-weight: 600; font-size: 0.9rem; transition: all 0.2s;
}
.admin-toggle-btn.active { background-color: var(--text-primary); color: var(--container-bg); }

.theme-btn {
    background: none; border: 1px solid var(--border-color);
    padding: 8px; border-radius: 50%; cursor: pointer;
    font-size: 1.2rem; display: flex; align-items: center; justify-content: center;
    color: var(--text-primary);
}
[data-theme="light"] .icon-moon, [data-theme="dark"] .icon-sun { display: none; }

/* Hero */
.hero { text-align: center; padding: 50px 0 30px; }
.hero-title { font-size: 2.2rem; font-weight: 800; margin-bottom: 10px; }
.hero-subtitle { color: var(--text-secondary); }

/* Layout & Cards */
.booking-layout { display: grid; grid-template-columns: 1.2fr 1fr; gap: 25px; margin-bottom: 60px; }
.card { background-color: var(--container-bg); border-radius: 16px; padding: 30px; box-shadow: var(--card-shadow); }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 1px solid var(--border-color); }
.card h3 { font-size: 1.2rem; }

.badge { background-color: var(--accent-color); color: #fff; padding: 4px 8px; border-radius: 4px; font-size: 0.7rem; font-weight: 800; }

/* Date & Time Grid */
.date-picker-container { margin-bottom: 25px; }
.date-picker-container label { display: block; margin-bottom: 8px; font-weight: 600; }
input[type="date"], input[type="text"], input[type="number"], textarea {
    width: 100%; padding: 12px; border: 1px solid var(--border-color); border-radius: 8px;
    background-color: var(--bg-color); color: var(--text-primary); font-family: inherit;
}

.time-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(70px, 1fr)); gap: 10px; margin-bottom: 20px; }
.time-slot {
    padding: 10px 0; text-align: center; background-color: var(--slot-available);
    border-radius: 8px; cursor: pointer; font-size: 0.85rem; font-weight: 500; transition: all 0.2s;
}
.time-slot.selected { background-color: var(--slot-selected); color: #fff; }
.time-slot.pending { 
    background-color: var(--slot-pending); 
    color: #fff; 
    cursor: not-allowed;
    pointer-events: none; /* 터치/클릭 완전 차단 */
    opacity: 0.8;
}
.time-slot.approved { 
    background-color: var(--slot-approved); 
    color: #fff; 
    cursor: not-allowed;
    pointer-events: none; /* 터치/클릭 완전 차단 */
    opacity: 0.6;
}

.legend { display: flex; gap: 12px; font-size: 0.8rem; color: var(--text-secondary); flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 4px; }
.box { width: 12px; height: 12px; border-radius: 3px; }
.box.available { background-color: var(--slot-available); }
.box.selected { background-color: var(--slot-selected); }
.box.pending { background-color: var(--slot-pending); }
.box.approved { background-color: var(--slot-approved); }

/* Reservation List */
.reservation-list { list-style: none; }
.reservation-item { padding: 15px; border: 1px solid var(--border-color); border-radius: 12px; margin-bottom: 10px; background-color: var(--bg-color); }
.res-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 8px; }
.res-time { font-weight: 700; color: var(--accent-color); }
.res-status { font-size: 0.75rem; font-weight: 700; padding: 2px 8px; border-radius: 20px; text-transform: uppercase; }
.status-pending { background-color: var(--slot-pending); color: #fff; }
.status-approved { background-color: var(--slot-approved); color: #fff; }
.status-rejected { background-color: var(--slot-rejected); color: #fff; }

.res-info { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 10px; }
.admin-actions { display: flex; gap: 8px; border-top: 1px solid var(--border-color); padding-top: 10px; }
.btn-sm { padding: 6px 12px; border: none; border-radius: 6px; cursor: pointer; font-size: 0.8rem; font-weight: 600; color: #fff; transition: opacity 0.2s; }
.btn-approve { background-color: var(--slot-approved); }
.btn-reject { background-color: var(--slot-rejected); }
.btn-sm:hover { opacity: 0.8; }

/* Form & UI */
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.9rem; }
.selected-summary { background-color: var(--bg-color); padding: 12px; border-radius: 8px; margin-bottom: 15px; font-size: 0.9rem; }
.submit-btn { width: 100%; padding: 15px; background-color: var(--accent-color); color: #fff; border: none; border-radius: 8px; font-weight: 700; cursor: pointer; }
.submit-btn:disabled { background-color: var(--border-color); color: var(--text-secondary); cursor: not-allowed; }
.form-notice { font-size: 0.8rem; color: var(--text-secondary); text-align: center; margin-top: 10px; }

.toast { position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%); background-color: #2ecc71; color: white; padding: 12px 24px; border-radius: 30px; box-shadow: 0 5px 15px rgba(0,0,0,0.2); font-weight: 600; z-index: 1000; }
.footer { text-align: center; padding: 30px 0; border-top: 1px solid var(--border-color); color: var(--text-secondary); font-size: 0.9rem; }
.empty-state { text-align: center; color: var(--text-secondary); padding: 20px 0; font-size: 0.9rem; }

@media (max-width: 800px) { .booking-layout { grid-template-columns: 1fr; } }