:root {
    --primary-color: #8b5cf6; /* Neon Purple */
    --primary-hover: #7c3aed;
    --secondary-color: #0ea5e9; /* Neon Cyan */
    --bg-color: #0f172a; /* Slate 900 (Dark Background) */
    --card-bg: #1e293b; /* Slate 800 (Card Background) */
    --text-color: #f8fafc; /* White text */
    --text-muted: #94a3b8; /* Gray text */
    --border-color: #334155;
    --danger-color: #f43f5e;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --radius: 16px;
    --glow-primary: 0 0 15px rgba(139, 92, 246, 0.4);
    --glow-secondary: 0 0 15px rgba(14, 165, 233, 0.4);
}

/* Global Reset & Body */
* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Plus Jakarta Sans', sans-serif; }

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 10% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 400px), 
                      radial-gradient(circle at 90% 80%, rgba(14, 165, 233, 0.1) 0%, transparent 400px);
    color: var(--text-color);
    line-height: 1.5;
    padding: 24px 16px;
    min-height: 100vh;
}

.container { max-width: 680px; margin: 0 auto; }

/* Header Banner */
.header-card {
    background: linear-gradient(135deg, #1e1b4b 0%, #4c1d95 100%);
    border: 1px solid rgba(139, 92, 246, 0.3);
    box-shadow: var(--glow-primary);
    color: white;
    padding: 32px 24px;
    border-radius: var(--radius);
    margin-bottom: 24px;
}
.badge-title {
    background-color: var(--secondary-color);
    color: #0f172a;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.header-card h1 { font-size: 24px; margin: 12px 0 8px 0; font-weight: 800; text-transform: uppercase; letter-spacing: -0.5px; }
.header-card p { font-size: 14px; color: #cbd5e1; }

/* Form Cards */
.form-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
}
.form-section { margin-bottom: 28px; padding-bottom: 24px; border-bottom: 1px dashed var(--border-color); }
.form-section h2 { font-size: 16px; font-weight: 800; margin-bottom: 12px; color: var(--secondary-color); text-transform: uppercase; letter-spacing: 0.5px; }
.section-desc { font-size: 13px; color: var(--text-muted); margin-bottom: 16px; }

/* Inputs */
.input-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 520px) { .input-row { grid-template-columns: 1fr; } }
label { font-size: 13px; font-weight: 700; color: #cbd5e1; }
.required { color: var(--danger-color); }

input[type="text"], input[type="tel"], textarea, select {
    width: 100%;
    padding: 12px 14px;
    background-color: #0f172a;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
}
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 12px rgba(14, 165, 233, 0.3);
}

/* Session Cards (Gaming HUD Style) */
.session-grid { display: flex; flex-direction: column; gap: 12px; }
.session-card {
    position: relative;
    border: 2px solid var(--border-color);
    background: #0f172a;
    border-radius: 10px;
    padding: 16px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}
.session-card:hover:not(.disabled) {
    border-color: var(--primary-color);
    box-shadow: inset 0 0 10px rgba(139, 92, 246, 0.2);
}
.session-card input[type="radio"] { position: absolute; opacity: 0; }
.session-card.selected {
    border-color: var(--secondary-color);
    background: rgba(14, 165, 233, 0.05);
    box-shadow: 0 0 15px rgba(14, 165, 233, 0.2);
}
.session-card.disabled { opacity: 0.5; background-color: #0f172a; cursor: not-allowed; border-color: var(--border-color); }

.session-info h3 { font-size: 15px; font-weight: 800; color: #f8fafc; }
.session-info p { font-size: 12px; color: var(--secondary-color); margin-top: 2px; }

.quota-badge { padding: 4px 10px; border-radius: 6px; font-size: 12px; font-weight: 800; text-align: right; }
.badge-available { background-color: rgba(16, 185, 129, 0.2); color: #34d399; }
.badge-warning { background-color: rgba(245, 158, 11, 0.2); color: #fbbf24; }
.badge-full { background-color: rgba(244, 63, 94, 0.2); color: #fb7185; }

.progress-bar-bg { width: 100%; height: 6px; background-color: var(--border-color); border-radius: 3px; margin-top: 10px; overflow: hidden; }
.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    box-shadow: 0 0 10px var(--secondary-color);
    transition: width 0.3s ease;
}

/* Consent Options */
.consent-text { font-size: 14px; margin-bottom: 12px; color: #cbd5e1; }
.radio-options { display: flex; gap: 16px; }
.radio-card-consent {
    flex: 1;
    background: #0f172a;
    border: 1px solid var(--border-color);
    padding: 12px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}
.radio-card-consent:hover { border-color: var(--primary-color); }

/* Buttons */
.btn-primary {
    width: 100%;
    background: linear-gradient(90deg, var(--primary-color), #6d28d9);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: var(--glow-primary);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 20px rgba(139, 92, 246, 0.6); }
.btn-secondary { width: 100%; background: var(--border-color); color: white; border: none; padding: 12px; border-radius: 8px; font-weight: 700; cursor: pointer; transition: 0.2s; }
.btn-secondary:hover { background: #475569; }

/* Modals & Loaders */
.spinner { width: 18px; height: 18px; border: 2px solid #ffffff; border-top: 2px solid transparent; border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.hidden { display: none !important; }

.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(15, 23, 42, 0.85); backdrop-filter: blur(4px); display: flex; justify-content: center; align-items: center; padding: 16px; z-index: 1000; }
.modal-content { background: var(--card-bg); padding: 32px; border-radius: var(--radius); border: 1px solid var(--primary-color); box-shadow: var(--glow-primary); max-width: 440px; width: 100%; text-align: center; }
.modal-icon { width: 56px; height: 56px; background: rgba(16, 185, 129, 0.1); color: var(--success-color); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 28px; margin: 0 auto 16px; border: 2px solid var(--success-color); }
.receipt-box { background: #0f172a; border: 1px dashed var(--border-color); padding: 16px; border-radius: 8px; text-align: left; font-size: 13px; margin: 20px 0; color: #cbd5e1; }

/* Nav & Headers */
.header-nav { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.nav-link-light { color: var(--secondary-color); text-decoration: none; font-size: 13px; font-weight: 700; transition: color 0.2s; }
.nav-link-light:hover { color: white; }

.navbar { display: flex; justify-content: space-between; align-items: center; background: var(--card-bg); padding: 16px 20px; border-radius: var(--radius); border: 1px solid var(--border-color); margin-bottom: 24px; box-shadow: 0 4px 15px rgba(0,0,0,0.3); }
.nav-brand { font-weight: 900; font-size: 18px; background: linear-gradient(90deg, var(--secondary-color), var(--primary-color)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 16px; }
.nav-links a { text-decoration: none; color: var(--text-muted); font-size: 13px; font-weight: 700; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--secondary-color); text-shadow: 0 0 8px rgba(14, 165, 233, 0.4); }

/* Participants List */
.participants-wrapper { display: flex; flex-direction: column; gap: 24px; }
.session-group-card { background: var(--card-bg); border-radius: var(--radius); border: 1px solid var(--border-color); overflow: hidden; box-shadow: 0 4px 15px rgba(0,0,0,0.3); }
.session-group-header { background: #0f172a; padding: 16px 20px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.session-group-header h3 { font-size: 16px; font-weight: 800; color: var(--secondary-color); text-transform: uppercase; }
.session-schedule { font-size: 12px; color: var(--text-muted); }
.count-badge { background: rgba(139, 92, 246, 0.2); color: var(--primary-color); padding: 4px 10px; border-radius: 6px; font-size: 12px; font-weight: 800; border: 1px solid rgba(139, 92, 246, 0.3); }
.session-group-body { padding: 20px; }
.participant-list { padding-left: 20px; display: flex; flex-direction: column; gap: 10px; }
.participant-list li { font-size: 14px; font-weight: 600; color: #cbd5e1; }
.empty-list-text { font-size: 13px; color: var(--text-muted); font-style: italic; }
.loading-state { text-align: center; padding: 32px; color: var(--secondary-color); font-size: 14px; font-weight: 700; animation: pulse 1.5s infinite; }
@keyframes pulse { 0% { opacity: 1; } 50% { opacity: 0.5; } 100% { opacity: 1; } }

/* HOMEPAGE / HERO */
.hero-card {
    padding: 48px 24px;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    text-align: center;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}
.hero-card::before {
    content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, transparent 60%);
    pointer-events: none;
}
.hero-title { font-size: 32px; font-weight: 900; letter-spacing: -1px; margin: 16px 0 8px 0; text-shadow: 0 0 15px rgba(139, 92, 246, 0.5); }
.hero-subtitle { font-size: 15px; color: #cbd5e1; margin-bottom: 28px; font-weight: 500; }
.hero-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; position: relative; z-index: 2; }

.btn-hero-primary { background: linear-gradient(90deg, var(--primary-color), var(--secondary-color)); color: white; padding: 12px 24px; border-radius: 8px; font-weight: 800; text-decoration: none; font-size: 14px; transition: 0.3s; box-shadow: var(--glow-secondary); text-transform: uppercase; letter-spacing: 1px; }
.btn-hero-primary:hover { transform: translateY(-3px); box-shadow: 0 0 25px rgba(14, 165, 233, 0.7); }
.btn-hero-secondary { background: rgba(15, 23, 42, 0.6); color: var(--secondary-color); border: 1px solid var(--secondary-color); padding: 12px 24px; border-radius: 8px; font-weight: 700; text-decoration: none; font-size: 14px; backdrop-filter: blur(4px); transition: 0.3s; }
.btn-hero-secondary:hover { background: rgba(14, 165, 233, 0.1); transform: translateY(-3px); }

/* Stats Grid */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 28px; }
@media (max-width: 600px) { .stats-grid { grid-template-columns: 1fr; } }
.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    transition: transform 0.3s;
}
.stat-card:hover { transform: translateY(-5px); border-color: var(--primary-color); }
.stat-label { background: rgba(139, 92, 246, 0.15); color: var(--secondary-color); font-size: 11px; font-weight: 800; padding: 6px 12px; border-radius: 6px; display: inline-block; margin-bottom: 12px; letter-spacing: 1px; border: 1px solid rgba(14, 165, 233, 0.3); }
.stat-sub { font-size: 12px; color: var(--text-muted); font-weight: 600; }
.stat-value { font-size: 42px; font-weight: 900; background: linear-gradient(90deg, var(--secondary-color), var(--primary-color)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; line-height: 1; margin: 4px 0; filter: drop-shadow(0 0 8px rgba(14,165,233,0.4)); }
.stat-desc { font-size: 12px; color: var(--text-muted); font-weight: 600; }

/* Facilities */
.facility-section { background: var(--card-bg); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border-color); margin-bottom: 24px; box-shadow: 0 5px 15px rgba(0,0,0,0.3); }
.section-title { font-size: 18px; font-weight: 900; color: var(--secondary-color); margin-bottom: 20px; text-transform: uppercase; letter-spacing: 0.5px; display: flex; align-items: center; gap: 8px; }
.facility-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 520px) { .facility-grid { grid-template-columns: 1fr; } }
.facility-card { display: flex; align-items: center; gap: 16px; padding: 16px; border: 1px solid var(--border-color); border-radius: 12px; background: #0f172a; transition: 0.3s; }
.facility-card:hover { border-color: var(--secondary-color); box-shadow: 0 0 15px rgba(14,165,233,0.15); transform: scale(1.02); }
.facility-number { width: 40px; height: 40px; background: rgba(139, 92, 246, 0.15); border: 1px solid var(--primary-color); color: var(--secondary-color); font-weight: 900; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 16px; flex-shrink: 0; box-shadow: inset 0 0 10px rgba(139,92,246,0.2); }
.facility-info h3 { font-size: 14px; font-weight: 800; color: #f8fafc; }
.facility-info p { font-size: 12px; color: #94a3b8; margin-top: 4px; }

/* CTA Box */
.cta-card { background: linear-gradient(135deg, rgba(30,41,59,0.8) 0%, rgba(15,23,42,0.9) 100%); border: 2px dashed var(--primary-color); padding: 32px 20px; border-radius: var(--radius); text-align: center; position: relative; box-shadow: var(--glow-primary); }
.cta-card h2 { font-size: 20px; color: #f8fafc; font-weight: 900; }
.cta-card p { font-size: 14px; color: var(--secondary-color); margin-top: 8px; }

/* WhatsApp Buttons */
.btn-wa { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background-color: #25d366; color: #0f172a; padding: 12px 16px; border-radius: 8px; font-weight: 900; text-decoration: none; font-size: 13px; width: 100%; transition: 0.3s; text-transform: uppercase; box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3); }
.btn-wa:hover { background-color: #128c7e; transform: translateY(-2px); color: white;}
.btn-hero-wa { background: #25d366; color: #0f172a; padding: 12px 24px; border-radius: 8px; font-weight: 900; text-decoration: none; font-size: 14px; transition: 0.3s; text-transform: uppercase; box-shadow: 0 4px 15px rgba(37, 211, 102, 0.4); }
.btn-hero-wa:hover { background: #128c7e; transform: translateY(-3px); color: white;}
.btn-wa-outline { display: inline-flex; align-items: center; justify-content: center; background: transparent; color: #25d366; border: 2px solid #25d366; padding: 12px 20px; border-radius: 8px; font-weight: 800; font-size: 14px; transition: 0.3s; text-transform: uppercase; }
.btn-wa-outline:hover { background: #25d366; color: #0f172a; box-shadow: 0 0 15px rgba(37, 211, 102, 0.5); }

/* Admin Area adjustments */
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 600px; color: #cbd5e1; }
.admin-table th, .admin-table td { padding: 14px 12px; border-bottom: 1px solid var(--border-color); text-align: left; vertical-align: middle; }
.admin-table th { background-color: #0f172a; font-weight: 800; color: var(--secondary-color); text-transform: uppercase; letter-spacing: 0.5px; }
.btn-delete, .btn-edit { color: white; border: none; padding: 8px 12px; border-radius: 6px; cursor: pointer; font-size: 12px; font-weight: 800; text-transform: uppercase; transition: 0.2s; }
.btn-delete { background-color: var(--danger-color); }
.btn-edit { background-color: var(--warning-color); color: #0f172a; }
.btn-delete:hover, .btn-edit:hover { filter: brightness(1.2); }

.batch-panel { background: rgba(16, 185, 129, 0.05) !important; border-color: rgba(16, 185, 129, 0.3) !important; }
.batch-panel h3 { color: var(--success-color) !important; }

/* Payment Badges */
.badge-status { padding: 4px 10px; border-radius: 6px; font-size: 11px; font-weight: 900; display: inline-block; letter-spacing: 0.5px; }
.status-lunas { background-color: rgba(16, 185, 129, 0.1); color: var(--success-color); border: 1px solid var(--success-color); }
.status-belum { background-color: rgba(244, 63, 94, 0.1); color: var(--danger-color); border: 1px solid var(--danger-color); }