:root {
    --bg-color: #0d0d0d;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --primary-color: #ff0055;
    --secondary-color: #00d4ff;
    --text-color: #e0e0e0;
    --text-muted: #888;
    --glass-blur: blur(12px);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Glassmorphism Cards */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Header & Sidebar */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    border-bottom: 1px solid var(--border-color);
}

.brand-logo {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -1px;
    color: #fff;
}

.brand-logo span {
    color: var(--primary-color);
}

/* Forms & Inputs */
input, select, button {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    color: #fff;
    outline: none;
    transition: all 0.3s ease;
}

input:focus, select:focus {
    border-color: var(--secondary-color);
    background: rgba(255, 255, 255, 0.12);
}

select option {
    background-color: #1a1a1a;
    color: #fff;
}

/* Time/Date input icons visibility in dark mode */
input::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
    opacity: 0.7;
}
input::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
}

button {
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary-color);
    border: none;
    color: white;
}

.btn-primary:hover {
    filter: brightness(1.2);
    transform: translateY(-2px);
}

/* Grid & Layout */
.container {
    padding: 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.grid-cols-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* Table Design */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.data-table th, .data-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    color: var(--text-muted);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.data-table tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* Status Badges */
.badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-play { background: rgba(0, 255, 127, 0.2); color: #00ff7f; }
.badge-stop { background: rgba(255, 0, 85, 0.2); color: #ff0055; }