:root {
    --primary-color: #003A70;
    --primary-light: #245486;
    --primary-dark: #002244;
    --secondary-color: #64CCC9;

    --background-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;

    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.08);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
    --shadow-glow: 0 0 20px rgba(100, 204, 201, 0.15);

    --radius-lg: 1.25rem;
    --radius-md: 0.75rem;
    --radius-sm: 0.5rem;

    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: 'Pretendard', 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--background-color);
    background-image:
        radial-gradient(at 0% 0%, rgba(100, 204, 201, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(0, 58, 112, 0.05) 0px, transparent 50%);
    background-attachment: fixed;
    margin: 0;
    padding: 3rem 5%;
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    position: relative;
    animation: fadeDown 0.8s ease-out;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(100, 204, 201, 0.1);
}

.header-controls {
    display: flex;
    gap: 1rem;
}

.btn {
    background-color: var(--card-bg);
    border: 1px solid transparent;
    color: var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.btn:hover {
    background-color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    color: var(--primary-dark);
}

.btn:active {
    transform: translateY(0);
}

.btn-reset {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border: none;
    box-shadow: 0 4px 6px -1px rgba(0, 58, 112, 0.2);
}

.btn-reset:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    box-shadow: 0 10px 15px -3px rgba(0, 58, 112, 0.3);
    color: white;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.card {
    background: rgba(255, 255, 255, 0.9);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.5);
    display: flex;
    flex-direction: column;
    transition: var(--transition-base);
    backdrop-filter: blur(8px);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    background: white;
    border-color: rgba(226, 232, 240, 0.8);
    z-index: 2;
}

.card h3 {
    margin: 0 0 0.75rem 0;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.value {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
    letter-spacing: -0.03em;
    line-height: 1.1;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.chart-card {
    min-height: 420px;
    height: 520px;
    display: flex;
    flex-direction: column;
}

.full-width {
    grid-column: 1 / -1;
}

#line-chart,
#pie-chart,
#code-chart,
#bar-chart {
    flex-grow: 1;
    width: 100%;
    height: 100%;
    position: relative;
}

.tooltip {
    position: absolute;
    text-align: center;
    padding: 1rem 1.25rem;
    font-size: 0.9rem;
    background: rgba(15, 23, 42, 0.95);
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(8px);
    color: #fff;
    border-radius: var(--radius-md);
    pointer-events: none;
    box-shadow: var(--shadow-lg);
    z-index: 100;
    line-height: 1.5;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: opacity 0.2s, top 0.2s, left 0.2s;
}

.filters-container {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.search-input {
    padding: 0.75rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    font-family: inherit;
    font-size: 0.95rem;
    width: 280px;
    background: var(--card-bg);
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.search-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(100, 204, 201, 0.15);
}

.filter-select {
    padding: 0.75rem 2.5rem 0.75rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    font-family: inherit;
    font-size: 0.95rem;
    background-color: var(--card-bg);
    cursor: pointer;
    transition: var(--transition-base);
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2364748b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.25em;
    box-shadow: var(--shadow-sm);
}

.filter-select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(100, 204, 201, 0.15);
}

.table-container {
    overflow-x: auto;
    margin-top: 10px;
    border-radius: var(--radius-lg);
    box-shadow: 0 0 0 1px var(--border-color);
    background: #fff;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

th,
td {
    padding: 1.25rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #f8fafc;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    transition: background-color 0.2s;
    position: sticky;
    top: 0;
}

th:hover {
    background-color: #f1f5f9;
    color: var(--primary-color);
}

tr:last-child td {
    border-bottom: none;
}

tr {
    transition: background-color 0.2s;
}

tr:hover {
    background-color: #f8fafc;
}

.grade-badge {
    padding: 0.35rem 0.9rem;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 3rem;
    letter-spacing: 0.02em;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.badge-excellent {
    background-color: #dcfce7;
    color: #15803d;
}

.badge-good {
    background-color: #dbeafe;
    color: #1d4ed8;
}

.badge-pass {
    background-color: #ccfbf1;
    color: #0f766e;
}

.badge-average {
    background-color: #ffedd5;
    color: #c2410c;
}

.badge-poor {
    background-color: #fee2e2;
    color: #b91c1c;
}


#course-table th:nth-child(2),
#course-table td:nth-child(2),
#course-table th:nth-child(4),
#course-table td:nth-child(4),
#course-table th:nth-child(5),
#course-table td:nth-child(5),
#course-table th:nth-child(6),
#course-table td:nth-child(6) {
    text-align: center;
}

.tick text {
    font-size: 13px;
    font-weight: 500;
    fill: var(--text-muted);
    font-family: inherit;
}

@keyframes fadeDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-up {
    animation: fadeUp 0.8s ease-out forwards;
}

.delay-100 {
    animation-delay: 0.1s;
}

.delay-200 {
    animation-delay: 0.2s;
}

.delay-300 {
    animation-delay: 0.3s;
}

@media (max-width: 1024px) {
    .charts-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    body {
        padding: 1.5rem 1rem;
    }

    .container {
        padding: 0;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        margin-bottom: 2rem;
        padding-bottom: 1.5rem;
    }

    .header-controls {
        width: 100%;
        justify-content: flex-start;
        gap: 0.75rem;
        flex-wrap: wrap;
    }

    .filters-container {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .search-input,
    .filter-select {
        width: 100%;
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .filters-container .btn {
        padding: 0.6rem;
        width: 100%;
    }

    h1 {
        font-size: 2rem;
    }

    .summary-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        margin-bottom: 2rem;
    }

    .card {
        padding: 1.25rem;
        border-radius: var(--radius-md);
    }

    .card h3 {
        font-size: 0.75rem;
        margin-bottom: 0.5rem;
    }

    .value {
        font-size: 1.75rem;
    }

    .chart-card {
        min-height: 350px;
        height: 350px;
    }

    .charts-container {
        gap: 1.5rem;
        margin-bottom: 2rem;
    }

    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
        flex: 1;
        text-align: center;
    }

    .btn-reset {
        flex: none;
    }

    footer {
        margin-top: 2rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }

    .value {
        font-size: 1.5rem;
    }

    .summary-cards {
        gap: 0.75rem;
    }

    .card {
        padding: 1rem;
    }
}

footer {
    margin-top: 3rem;
    padding: 2rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid rgba(226, 232, 240, 0.6);
    animation: fadeUp 0.8s ease-out forwards;
    animation-delay: 0.4s;
    opacity: 0;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

footer a:hover {
    color: var(--primary-light);
    text-decoration: underline;
}


.filtered-summary {
    display: flex;
    justify-content: flex-start;
    gap: 20px;
    padding: 12px 16px;
    background-color: #f8fafc;
    border-radius: 8px;
    margin-bottom: 0px;
    border: 1px solid #e2e8f0;
}

.filtered-stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.fs-label {
    color: #64748b;
    font-weight: 500;
}

.fs-value {
    color: #0f172a;
    font-weight: 700;
    font-size: 1rem;
}