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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --secondary-dark: #059669;
    --danger-color: #ef4444;
    --danger-dark: #dc2626;
    --background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --background-alt: #f9fafb;
    --card-background: #ffffff;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.popup-modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.25);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}
.popup-modal.active {
    display: flex;
}
.popup-content {
    background: var(--card-background);
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    padding: 32px 40px;
    min-width: 320px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 18px;
    font-size: 1.15rem;
    animation: popupFadeIn 0.3s;
}
#errorPopupIcon {
    font-size: 2.5rem;
    color: var(--danger-color);
}
#loadingPopupIcon {
    font-size: 2.5rem;
    color: var(--primary-color);
    animation: loadingSpin 1.2s linear infinite;
}
#confirmPopupIcon {
    font-size: 2.5rem;
    color: #f59e0b;
}
@keyframes loadingSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
@keyframes popupFadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 20px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 25px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
}

header h1 {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Search Bar */
#searchBar {
    display: flex;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

#searchInput {
    flex: 1;
    min-width: 250px;
    padding: 14px 20px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    transition: all 0.3s ease;
    background: white;
}

#searchInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9ff 100%);
    border: 2px solid transparent;
    border-radius: 20px;
    padding: 30px 25px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--shadow);
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
}

.card:hover::before {
    opacity: 0.1;
}

.card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.card > * {
    position: relative;
    z-index: 1;
}

.card-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.card-date {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.card-class {
    font-size: 15px;
    color: var(--primary-color);
    margin-top: 8px;
    font-weight: 600;
    padding: 5px 15px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 20px;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-danger, .btn-small {
    padding: 12px 28px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.btn-primary::before,
.btn-secondary::before,
.btn-danger::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-primary:hover::before,
.btn-secondary:hover::before,
.btn-danger:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
    color: white;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(16, 185, 129, 0.3);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), var(--danger-dark));
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(239, 68, 68, 0.3);
}

.btn-small {
    padding: 8px 18px;
    font-size: 13px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-small:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(99, 102, 241, 0.3);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { 
        opacity: 0;
        backdrop-filter: blur(0px);
    }
    to { 
        opacity: 1;
        backdrop-filter: blur(8px);
    }
}

.modal-content {
    background: linear-gradient(135deg, #ffffff 0%, #fafbff 100%);
    margin: 3% auto;
    padding: 0;
    border-radius: 24px;
    width: 90%;
    max-width: 700px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
    animation: slideUp 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    max-height: 90vh;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.8);
    display: flex;
    flex-direction: column;
}

.modal-small {
    max-width: 500px;
}

.modal-large {
    max-width: 1200px;
}

/* Modal Header */
.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 25px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 3px solid rgba(255, 255, 255, 0.3);
}

.modal-header h2,
.modal-header h3 {
    margin: 0;
    color: white;
    font-weight: 700;
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.modal-icon {
    font-size: 28px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* Modal Body */
.modal-body {
    padding: 35px;
    overflow-y: auto;
    flex: 1;
}

/* Modal Footer */
.modal-footer {
    padding: 25px 35px;
    background: linear-gradient(to top, rgba(99, 102, 241, 0.03), transparent);
    border-top: 2px solid var(--border-color);
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.modal-footer button {
    flex: 1;
    min-width: 120px;
}

@keyframes slideUp {
    from {
        transform: translateY(100px) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.close {
    color: white;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 28px;
    transition: all 0.3s ease;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg) scale(1.1);
}

#modalTitle {
    margin: 0;
    color: white;
    font-weight: 700;
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Form Elements */
.detail-section, .scores-section, .metadata-section {
    margin-bottom: 30px;
}

.info-group {
    margin-bottom: 20px;
}

.info-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 15px;
    letter-spacing: 0.3px;
}

.label-icon {
    font-size: 18px;
}

.info-group input, .info-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
    background: white;
}

.info-group input:focus, .info-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* Info Notice */
.info-notice {
    display: flex;
    gap: 15px;
    padding: 18px 20px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(16, 185, 129, 0.08));
    border-left: 4px solid var(--primary-color);
    border-radius: 12px;
    margin-bottom: 25px;
    animation: slideIn 0.4s ease;
}

.notice-icon {
    font-size: 24px;
}

.info-notice p {
    margin: 5px 0;
    line-height: 1.6;
}

.info-notice code {
    background: rgba(99, 102, 241, 0.15);
    padding: 3px 8px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-dark);
}

/* Scores Table */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--border-color);
    flex-wrap: wrap;
    gap: 15px;
}

.section-header h3 {
    margin: 0;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-icon {
    font-size: 24px;
}

.section-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-icon-text {
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-icon-text span {
    font-size: 14px;
}

.btn-icon-prefix {
    font-size: 16px;
    margin-right: 6px;
}

#scoresTable {
    overflow-x: auto;
}

.scores-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
    margin-top: 15px;
}

.score-item {
    position: relative;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.score-item label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.score-input-wrapper {
    position: relative;
}

.score-input-wrapper input {
    width: 100%;
    padding: 12px 35px 12px 12px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.3s ease;
    background: white;
}

.score-input-wrapper input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    outline: none;
}

.remove-column {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(239, 68, 68, 0.1);
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 18px;
    padding: 5px 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.remove-column:hover {
    background: var(--danger-color);
    color: white;
    transform: translateY(-50%) scale(1.1);
}

/* Metadata */
.metadata-section {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(16, 185, 129, 0.05));
    padding: 20px 25px;
    border-radius: 16px;
    border: 2px solid rgba(99, 102, 241, 0.1);
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.metadata-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.metadata-icon {
    font-size: 20px;
}

.metadata-item strong {
    color: var(--text-primary);
    margin-right: 5px;
}

.metadata-item span {
    color: var(--primary-color);
    font-weight: 600;
}

/* Modal Actions (legacy support) */
.modal-actions {
    display: flex;
    gap: 15px;
    margin-top: 35px;
    flex-wrap: wrap;
    padding-top: 25px;
    border-top: 2px solid var(--border-color);
}

.modal-actions button {
    flex: 1;
    min-width: 120px;
    position: relative;
    z-index: 1;
}

/* Loading - Old style (keep for compatibility) */
.loading {
    text-align: center;
    padding: 60px;
    color: var(--text-secondary);
    font-size: 18px;
    font-weight: 600;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 40px;
    height: 40px;
    margin-left: 15px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Initial Loading - New beautiful style */
.initial-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    min-height: 400px;
    gap: 24px;
    animation: fadeIn 0.5s ease-in;
}

.loading-spinner {
    width: 80px;
    height: 80px;
    border: 6px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--primary-color);
    border-right-color: var(--secondary-color);
    border-radius: 50%;
    animation: spin 1s ease-in-out infinite;
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.3);
}

.loading-text {
    font-size: 24px;
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    letter-spacing: 0.5px;
}

.loading-subtext {
    font-size: 16px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.8);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

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

/* Responsive */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
    }

    header h1 {
        font-size: 26px;
    }

    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 15px;
    }

    .card {
        padding: 20px 15px;
        min-height: 150px;
    }

    .modal-content {
        width: 95%;
        margin: 5% auto;
        border-radius: 20px;
    }

    .modal-header {
        padding: 20px;
    }

    .modal-header h2,
    .modal-header h3 {
        font-size: 20px;
    }

    .modal-body {
        padding: 25px 20px;
    }

    .modal-footer {
        padding: 20px;
        flex-direction: column;
    }

    .modal-footer button {
        width: 100%;
    }

    .modal-icon {
        font-size: 24px;
    }

    .section-actions {
        width: 100%;
    }

    .section-actions button {
        flex: 1;
        min-width: auto;
    }

    .scores-grid {
        grid-template-columns: 1fr;
    }

    .modal-actions {
        flex-direction: column;
    }

    .modal-actions button {
        width: 100%;
    }

    .students-table th,
    .students-table td {
        padding: 10px 8px;
        font-size: 13px;
    }

    .btn-primary, .btn-secondary, .btn-danger {
        padding: 12px 20px;
        font-size: 14px;
    }

    .metadata-section {
        flex-direction: column;
        gap: 15px;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--background-alt);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
}

/* Selection styling */
::selection {
    background: rgba(99, 102, 241, 0.3);
    color: var(--text-primary);
}

/* Focus visible for accessibility */
*:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Empty state - New beautiful design */
.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    min-height: 400px;
    gap: 20px;
    animation: fadeIn 0.5s ease-in;
}

.empty-icon {
    font-size: 80px;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(0 4px 12px rgba(99, 102, 241, 0.3));
}

.empty-title {
    font-size: 28px;
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    margin-top: 10px;
}

.empty-message {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 500px;
    text-align: center;
    line-height: 1.6;
}

.empty-actions {
    display: flex;
    gap: 15px;
    margin-top: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* Error state - New beautiful design */
.error-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    min-height: 400px;
    gap: 20px;
    animation: fadeIn 0.5s ease-in;
}

.error-icon {
    font-size: 80px;
    animation: shake 0.5s ease-in-out;
    filter: drop-shadow(0 4px 12px rgba(239, 68, 68, 0.3));
}

.error-title {
    font-size: 28px;
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.error-state .error-message {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    background: rgba(239, 68, 68, 0.15);
    padding: 12px 24px;
    border-radius: 8px;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.error-actions {
    display: flex;
    gap: 15px;
    margin-top: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* Old error message style (keep for compatibility) */
.error-message {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(220, 38, 38, 0.1));
    color: var(--danger-color);
    padding: 20px 25px;
    border-radius: 16px;
    margin-bottom: 25px;
    border-left: 5px solid var(--danger-color);
    font-weight: 600;
    box-shadow: var(--shadow);
}

/* Students table */
.students-table-wrapper {
    overflow-x: auto;
    margin-top: 20px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.students-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.students-table th,
.students-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 2px solid var(--border-color);
}

.students-table th {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(16, 185, 129, 0.1));
    font-weight: 700;
    position: sticky;
    top: 0;
    z-index: 10;
    color: var(--primary-color);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 1px;
}

.students-table tr {
    transition: all 0.3s ease;
}

.students-table tr:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.03), rgba(16, 185, 129, 0.03));
    transform: scale(1.01);
}

.students-table input {
    width: 90px;
    padding: 8px 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.students-table input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    outline: none;
}

.student-actions {
    display: flex;
    gap: 8px;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 20px;
    padding: 8px 12px;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.btn-icon:hover {
    background-color: var(--border-color);
    transform: scale(1.15);
}

.btn-icon.edit {
    color: var(--primary-color);
}

.btn-icon.edit:hover {
    background: rgba(99, 102, 241, 0.1);
}

.btn-icon.delete {
    color: var(--danger-color);
}

.btn-icon.delete:hover {
    background: rgba(239, 68, 68, 0.1);
}

textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
    transition: all 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Header Actions */
.header-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* Excel Import Styles */
.excel-upload-section {
    margin-bottom: 35px;
}

#previewSection {
    margin-bottom: 35px;
    padding-bottom: 35px;
    border-bottom: 2px dashed var(--border-color);
}

#mappingSection {
    margin-bottom: 35px;
    padding-bottom: 35px;
    border-bottom: 2px dashed var(--border-color);
}

#summarySection {
    margin-bottom: 20px;
}

.excel-upload-section .section-header,
#previewSection .section-header,
#mappingSection .section-header {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(16, 185, 129, 0.05));
    padding: 15px 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-color);
}

#previewSection .section-header h4,
#mappingSection .section-header h4 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 20px;
    padding: 50px 30px;
    text-align: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.03), rgba(16, 185, 129, 0.03));
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(16, 185, 129, 0.08));
    transform: scale(1.02);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(16, 185, 129, 0.15));
    transform: scale(1.05);
}

.upload-icon {
    font-size: 64px;
    margin-bottom: 15px;
    animation: float 3s ease-in-out infinite;
}

.upload-area h4 {
    margin: 15px 0 10px;
    color: var(--text-primary);
    font-size: 20px;
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.file-info {
    margin: 25px 0 30px;
    animation: slideIn 0.3s ease;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px 25px;
    background: white;
    border-radius: 16px;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow);
}

.info-icon {
    font-size: 36px;
}

.info-card strong {
    font-size: 16px;
    color: var(--text-primary);
    display: block;
}

.info-card p {
    color: var(--text-secondary);
    margin: 5px 0 0;
    font-size: 14px;
}

/* Preview Table */
.preview-table-wrapper {
    overflow-x: auto;
    margin-top: 20px;
    margin-bottom: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    max-height: 350px;
    overflow-y: auto;
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    font-size: 13px;
}

.preview-table th,
.preview-table td {
    padding: 12px 15px;
    text-align: left;
    border: 1px solid var(--border-color);
}

.preview-table th {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(16, 185, 129, 0.15));
    font-weight: 700;
    position: sticky;
    top: 0;
    z-index: 10;
    color: var(--primary-color);
}

.preview-table tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

.preview-table tr:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(16, 185, 129, 0.05));
}

/* Preview Controls */
.preview-controls {
    display: flex;
    gap: 15px;
    align-items: center;
}

.sheet-select {
    padding: 8px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sheet-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Mapping Section */
.mapping-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 0;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.mapping-item {
    display: flex;
    flex-direction: column;
}

.mapping-item.full-width {
    grid-column: 1 / -1;
    padding-top: 15px;
    border-top: 2px solid var(--border-color);
}

.mapping-select {
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 14px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 8px;
}

.mapping-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.score-columns-map {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.score-column-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    color: white;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    animation: slideIn 0.3s ease;
}

.score-column-chip input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Summary Section */
.summary-card {
    background: white;
    padding: 30px;
    border-radius: 16px;
    border: 2px solid var(--border-color);
    margin: 0;
    box-shadow: var(--shadow);
}

.summary-card h4 {
    margin: 0 0 25px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 20px;
}

.summary-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(16, 185, 129, 0.05));
    border-radius: 12px;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.summary-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.summary-icon {
    font-size: 32px;
}

.summary-item strong {
    font-size: 24px;
    color: var(--primary-color);
    display: block;
}

.summary-item p {
    margin: 5px 0 0;
    color: var(--text-secondary);
    font-size: 13px;
}