:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --line-color: rgba(255, 255, 255, 0.1);
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

.container {
    max-width: 1400px;
    /* Wider for grid */
    margin: 0 auto;
    padding: 0 1rem;
}

.main-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-bottom: 1.5rem;
}

.logo {
    margin: 0;
    font-size: 1.5rem;
    color: #3b82f6;
}

.schedule-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.schedule-controls h2 {
    margin: 0;
}

/* Only style plain .btn (no Bootstrap variant), e.g. standalone unstyled buttons */
.btn:not([class*="btn-"]) {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn:not([class*="btn-"]):hover {
    background: #2d3748;
}

/* Daily Grid Layout */
.daily-grid-container {
    overflow-x: auto;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

.daily-grid {
    display: grid;
    /* Col 1 = Time (60px), Others = 1fr per coach */
    grid-template-columns: 60px repeat(var(--num-coaches), minmax(150px, 1fr));
    /* Row 1 = Header, Rest = 15min intervals (var --row-height, default 20px) */
    grid-template-rows: 50px repeat(var(--total-rows), var(--row-height, 20px));
}

/* Header */
.grid-header-time {
    grid-column: 1;
    grid-row: 1;
    border-bottom: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    background: #0f172a;
    position: sticky;
    top: 0;
    left: 0;
    z-index: 200;
}

.grid-header-coach {
    grid-row: 1;
    text-align: center;
    align-content: center;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-top: 4px solid transparent;
    /* Defined inline */
    background: #0f172a;
    position: sticky;
    top: 0;
    z-index: 100;
}

/* Time Labels */
.grid-time-label {
    grid-column: 1;
    text-align: right;
    padding-right: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    transform: translateY(-50%);
    /* Center on line */
    border-right: 1px solid var(--border-color);
    background: #0f172a; /* Ensure transparency doesn't show content behind */
    position: sticky;
    left: 0;
    z-index: 100;
}

/* Grid Lines */
.grid-line {
    border-top: 1px dashed var(--line-color);
    pointer-events: none;
}

.grid-time-label:nth-child(4n+1)+.grid-line {
    /* Every hour, solid line */
    border-top: 1px solid var(--border-color);
}

/* Slots */
.grid-slot {
    margin: 1px 4px;
    /* Gaps */
    border-radius: 4px;
    font-size: 0.75rem;
    padding: 2px 4px;
    opacity: 0.9;
    border: 1px solid rgba(255, 255, 255, 0.2);
    /* Ensure default is hidden, replacing inline style eventually */
    overflow: hidden;
    transition: all 0.2s ease-in-out;
}

.grid-slot:hover {
    z-index: 100;
    opacity: 1;
    cursor: pointer;
    overflow: visible;
    /* Allow breaking out if needed, or stick to auto */
    height: auto !important;
    min-height: 100%;
    max-height: 300px;
    overflow-y: auto;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
}

.slot-time {
    font-weight: 700;
    display: block;
}

.slot-type {
    opacity: 0.9;
    font-size: 0.7rem;
}

.slot-booking {
    margin-top: 2px;
    font-weight: 600;
    background: rgba(0, 0, 0, 0.2);
    padding: 1px 3px;
    border-radius: 2px;
}