:root {
    --primary-color: #4a6cf7;
    --secondary-color: #6a75f8;
    --background-color: #f8f9fa;
    --surface-color: #ffffff;
    --text-color: #333333;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --glow: 0 0 20px rgba(74, 108, 247, 0.3);
}

.dark-mode {
    --primary-color: #6a75f8;
    --secondary-color: #8a94f9;
    --background-color: #0a0a0a;
    --surface-color: #1a1a1a;
    --text-color: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #333333;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    --glow: 0 0 30px rgba(106, 117, 248, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background: linear-gradient(135deg, var(--background-color) 0%, color-mix(in srgb, var(--background-color) 90%, transparent) 100%);
    color: var(--text-color);
    transition: var(--transition);
    min-height: 100vh;
    padding: 20px;
    overflow-x: hidden;
    position: relative;
}

#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: 1300px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, var(--surface-color) 0%, color-mix(in srgb, var(--surface-color) 98%, transparent) 100%);
    border-radius: 10px;
    padding: 15px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(5px);
}

h1 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.controls {
    display: flex;
    gap: 10px;
    align-items: center;
}

.search-box {
    position: relative;
}

.search-box input {
    padding: 6px 10px 6px 30px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-color);
    color: var(--text-color);
    width: 300px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--glow);
    transform: translateY(-1px);
}

.search-box i {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input:focus + i {
    color: var(--primary-color);
}

.theme-toggle {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-color);
    padding: 6px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--glow);
}

.table-container {
    background: linear-gradient(135deg, var(--surface-color) 0%, color-mix(in srgb, var(--surface-color) 98%, transparent) 100%);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    backdrop-filter: blur(5px);
    border: 1px solid color-mix(in srgb, var(--border-color) 50%, transparent);
}

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

thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

th {
    padding: 10px 12px;
    text-align: left;
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table-row {
    opacity: 0;
    transform: translateX(-50px);
}

tbody tr {
    border-bottom: 1px solid color-mix(in srgb, var(--border-color) 30%, transparent);
}

tbody tr:hover {
    background: color-mix(in srgb, var(--primary-color) 5%, transparent);
    transform: translateY(-1px) scale(1.002);
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}

td {
    padding: 10px 12px;
    font-size: 0.9rem;
    font-weight: 500;
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-weight: 800;
    font-size: 0.8rem;
}

.rank-gold {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    box-shadow: 0 2px 7px rgba(255, 215, 0, 0.4);
}

.rank-silver {
    background: linear-gradient(135deg, #C0C0C0, #A0A0A0);
    box-shadow: 0 2px 7px rgba(192, 192, 192, 0.4);
}

.rank-bronze {
    background: linear-gradient(135deg, #CD7F32, #A0522D);
    box-shadow: 0 2px 7px rgba(205, 127, 50, 0.4);
}

.student-name {
    font-weight: 600;
    color: var(--primary-color);
    cursor: pointer;
}

.rank-tag {
    background: color-mix(in srgb, var(--primary-color) 10%, transparent);
    padding: 3px 6px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.8rem;
    border: 1px solid color-mix(in srgb, var(--primary-color) 30%, transparent);
    cursor: pointer;
}

.xp-value {
    font-family: 'Courier New', monospace;
    font-weight: 700;
    color: var(--secondary-color);
    cursor: pointer;
}

.xp-progress {
    display: flex;
    align-items: center;
    gap: 7px;
    cursor: pointer;
}

.progress-bar {
    flex-grow: 1;
    height: 5px;
    background: color-mix(in srgb, var(--border-color) 50%, transparent);
    border-radius: 5px;
    overflow: hidden;
    cursor: pointer;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 5px;
}

.xp-needed {
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 40px;
    text-align: right;
    cursor: pointer;
}

.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--background-color) 0%, color-mix(in srgb, var(--background-color) 90%, transparent) 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.loading.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(1.1);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 2px solid color-mix(in srgb, var(--border-color) 50%, transparent);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1.5s linear infinite;
    margin-bottom: 12px;
}

.loading p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.blur-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: color-mix(in srgb, var(--background-color) 80%, transparent);
    backdrop-filter: blur(8px);
    z-index: 1000;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
        padding: 10px;
    }
    h1 {
        font-size: 1.2rem;
    }
    .controls {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    .search-box input {
        width: 100%;
        max-width: 200px;
    }
    th, td {
        padding: 8px 6px;
        font-size: 0.75rem;
    }
    .table-container {
        border-radius: 8px;
    }
}

@media (max-width: 480px) {
    .search-box input {
        max-width: 150px;
    }
    th, td {
        padding: 6px 4px;
        font-size: 0.7rem;
    }
    .rank-badge {
        width: 18px;
        height: 18px;
        font-size: 0.75rem;
    }
    .rank-tag {
        padding: 2px 4px;
        font-size: 0.75rem;
    }
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: color-mix(in srgb, var(--border-color) 20%, transparent);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 6px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.controls input[type="number"] {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-color);
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow);
    margin-left: 10px;
}

.controls input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--glow);
    transform: translateY(-1px);
}

.student-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 25px;
    z-index: 1001;
    width: 90%;
    max-width: 450px;
    color: var(--text-color);
    font-family: Arial, sans-serif;
    opacity: 0;
    backdrop-filter: none;
}

.popup-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.popup-icon {
    width: 35px;
    height: 35px;
    margin-right: 15px;
}

.popup-name {
    flex-grow: 1;
    font-size: 1.3rem;
    font-weight: 700;
}

.close-popup {
    cursor: pointer;
    font-size: 1.7rem;
    color: var(--text-secondary);
}

.close-popup:hover {
    color: var(--primary-color);
}

.popup-content {
    margin-bottom: 20px;
}

.popup-content p {
    margin: 8px 0;
    font-size: 1rem;
}

.refresh-data {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    width: 100%;
    font-weight: 500;
}

.refresh-data:hover {
    background: color-mix(in srgb, var(--primary-color) 80%, var(--secondary-color));
}

@media (max-width: 600px) {
    .student-popup {
        width: 85%;
        max-width: 350px;
        padding: 15px;
    }
    .popup-icon {
        width: 25px;
        height: 25px;
    }
    .popup-name {
        font-size: 1.1rem;
    }
    .popup-content p {
        font-size: 0.9rem;
    }
    .refresh-data {
        padding: 8px 15px;
    }
}

@media (max-width: 400px) {
    .student-popup {
        max-width: 300px;
        padding: 10px;
    }
    .popup-name {
        font-size: 1rem;
    }
    .popup-content p {
        font-size: 0.85rem;
    }
    .refresh-data {
        padding: 6px 12px;
    }
}