:root {
    --bg-dark: #0f172a;
    --bg-panel: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    --accent-purple: #8b5cf6;
    --accent-blue: #3b82f6;
    --accent-pink: #ec4899;
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Background Blobs for Modern Aesthetic */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 20s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(139,92,246,0.8) 0%, rgba(139,92,246,0) 70%);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59,130,246,0.6) 0%, rgba(59,130,246,0) 70%);
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 50px) scale(1.1); }
}

/* Layout */
.dashboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    animation: slideDown 0.8s ease-out;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

header h1 span {
    color: var(--accent-purple);
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-size: 1.1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.primary-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
}

.primary-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.primary-btn.loading svg {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
    animation: fadeIn 1s ease-out 0.2s both;
}

.stat-card {
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    border-color: rgba(255,255,255,0.2);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
}

.stat-icon.purple { background: rgba(139,92,246,0.2); color: var(--accent-purple); }
.stat-icon.blue { background: rgba(59,130,246,0.2); color: var(--accent-blue); }
.stat-icon.pink { background: rgba(236,72,153,0.2); color: var(--accent-pink); }

.stat-info h3 {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
}

.stat-info p {
    font-size: 2rem;
    font-weight: 800;
}

/* Glass Panel for Tables */
.glass-panel {
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2rem;
    animation: fadeIn 1s ease-out 0.4s both;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.glass-select {
    background: rgba(0,0,0,0.2);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    outline: none;
}

.glass-select option {
    background: var(--bg-dark);
}

/* Table */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1.25rem 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

tbody tr {
    transition: background 0.2s ease;
}

tbody tr:hover {
    background: rgba(255,255,255,0.02);
}

/* Badges */
.badge {
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge.kelas-a { background: rgba(139,92,246,0.15); color: #a78bfa; }
.badge.kelas-b { background: rgba(59,130,246,0.15); color: #93c5fd; }
.badge.kelas-semua { background: rgba(236,72,153,0.15); color: #f9a8d4; }

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-dot.pending { background: var(--warning); box-shadow: 0 0 10px var(--warning); }
.status-dot.completed { background: var(--success); box-shadow: 0 0 10px var(--success); }
.status-dot.past-due { background: var(--danger); box-shadow: 0 0 10px var(--danger); }

/* Links */
.link-icon {
    color: var(--text-secondary);
    transition: color 0.2s;
}

.link-icon:hover {
    color: var(--accent-blue);
}

/* Footer */
footer {
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-bottom: 2rem;
}

footer a {
    color: var(--accent-purple);
    text-decoration: none;
}

/* Loading state */
.loading-cell {
    text-align: center;
    padding: 3rem !important;
    color: var(--text-secondary);
}

.spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255,255,255,0.1);
    border-top-color: var(--accent-purple);
    border-radius: 50%;
    animation: spin 1s infinite linear;
    vertical-align: middle;
    margin-right: 10px;
}

/* Animations */
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* Responsive */
@media (max-width: 768px) {
    header { flex-direction: column; align-items: flex-start; gap: 1rem; }
    .section-header { flex-direction: column; align-items: flex-start; gap: 1rem; }
    .stats-grid { grid-template-columns: 1fr; }
}