:root {
    --bg-dark: #0f1115;
    --sidebar-bg: #16181d;
    --card-bg: #1e2027;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --border: #2d3748;
    --booked-bg: rgba(59, 130, 246, 0.2);
    --booked-border: #3b82f6;
    --danger: #ef4444;
    --success: #10b981;
}

body {
    margin: 0; padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-dark); color: var(--text-main);
}

/* --- Login Page --- */
.login-container {
    display: flex; justify-content: center; align-items: center; height: 100vh;
}
.login-box {
    background: var(--card-bg); padding: 40px; border-radius: 8px;
    border: 1px solid var(--border); width: 100%; max-width: 400px;
}
.login-box h2 { text-align: center; margin-top: 0; margin-bottom: 20px; letter-spacing: 1px; }

/* --- Forms & Inputs --- */
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; color: var(--text-muted); font-size: 14px; }
input, select, textarea {
    width: 100%; padding: 10px; background: var(--bg-dark); border: 1px solid var(--border);
    color: var(--text-main); border-radius: 4px; box-sizing: border-box;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); }

.btn {
    width: 100%; padding: 12px; border: none; border-radius: 4px; cursor: pointer;
    font-weight: bold; transition: 0.2s;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: #2563eb; }
.btn-danger { background: var(--danger); color: white; }

/* --- Layout (Dashboard) --- */
.wrapper { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar {
    width: 250px; background-color: var(--sidebar-bg); border-right: 1px solid var(--border);
    display: flex; flex-direction: column; padding: 20px 0;
}
.logo { padding: 0 20px 30px; font-size: 20px; font-weight: bold; text-align: center; }
.nav-tabs { flex-grow: 1; display: flex; flex-direction: column; gap: 5px; }
.nav-item {
    padding: 12px 20px; color: var(--text-muted); text-decoration: none;
    border-left: 3px solid transparent; transition: 0.2s;
}
.nav-item:hover, .nav-item.active { background-color: var(--card-bg); color: var(--text-main); border-left-color: var(--accent); }
.sidebar-bottom { padding: 20px; border-top: 1px solid var(--border); text-align: center; }

/* Main Content area */
.main-content { flex-grow: 1; display: flex; padding: 20px; gap: 20px; overflow-y: auto; }
.center-col { flex: 3; display: flex; flex-direction: column; gap: 20px; }
.right-col { flex: 1; background: var(--card-bg); border-radius: 8px; border: 1px solid var(--border); padding: 20px; }

/* Calendar */
.calendar-container { background: var(--card-bg); border-radius: 8px; border: 1px solid var(--border); padding: 15px; overflow-x: auto; }
table.timeline { width: 100%; border-collapse: collapse; min-width: 800px; }
.timeline th, .timeline td { border: 1px solid var(--border); padding: 10px; text-align: center; }
.timeline th { color: var(--text-muted); font-size: 13px; }
.room-col { font-weight: bold; background: var(--sidebar-bg); width: 80px; }
/* The Booking Highlight */
.booked {
    background-color: var(--booked-bg); border-left: 3px solid var(--booked-border);
    font-size: 12px; padding: 5px; border-radius: 3px; position: relative; cursor: pointer;
    white-space: normal;
    z-index: 1; /* Establishes a base level */
}

/* Elevate the element heavily on hover so it breaks out of the table cell */
.booked:hover {
    z-index: 999; 
}

/* Hover Tooltip */
.tooltip-data {
    display: none; position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
    background: #2d3748; padding: 10px; border-radius: 5px; box-shadow: 0 4px 12px rgba(0,0,0,0.6);
    width: 220px; z-index: 1000; text-align: left; font-size: 12px; color: #fff; white-space: normal;
    pointer-events: none; /* Stops the tooltip from flickering if your mouse touches it */
}

.booked:hover .tooltip-data { display: block; }

/* --- Modal --- */
.modal {
    display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.7); align-items: center; justify-content: center;
}
.modal-content {
    background-color: var(--card-bg); padding: 25px; border-radius: 8px;
    border: 1px solid var(--border); width: 90%; max-width: 600px; max-height: 90vh; overflow-y: auto;
}
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.close-btn { color: var(--text-muted); font-size: 24px; cursor: pointer; border: none; background: none; }
.close-btn:hover { color: white; }
.form-row { display: flex; gap: 15px; }
.form-row .form-group { flex: 1; }