:root {
    --w-col: 140px;
    --gap: 20px;

    --c-blue: #0066dd;
    --c-teal: #00b8a9;
    --c-green: #7ec850;
    --c-yellow: #ffc400;
    --c-orange: #ff8800;
    --c-magenta: #e91e8c;
    --c-purple: #7c3aed;
}

* { box-sizing: border-box; }

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    color: #1a1a1a;
}

h1 {
    text-align: center;
    font-size: 2rem;
    margin: 0 0 8px 0;
    text-transform: uppercase;
    font-weight: 900;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #0066dd 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    text-align: center;
    font-size: 0.95rem;
    margin-bottom: 20px;
    font-weight: 600;
    color: #666;
    letter-spacing: 0.5px;
}

.instructions {
    background: rgba(0, 102, 221, 0.05);
    border-left: 4px solid var(--c-blue);
    padding: 14px 16px;
    margin-bottom: 20px;
    max-width: 900px;
    font-size: 0.9rem;
    border-radius: 8px;
    color: #333;
    line-height: 1.5;
}

.stats-bar {
    background: white;
    border: none;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    display: flex;
    gap: 35px;
    justify-content: center;
    flex-wrap: wrap;
    max-width: 900px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.3s ease;
}

.stats-bar:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

.stat-item {
    text-align: center;
    transition: transform 0.2s ease;
}

.stat-item:hover {
    transform: translateY(-2px);
}

.stat-label {
    font-size: 0.75rem;
    color: #888;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.3px;
    margin-bottom: 6px;
}

.stat-value {
    font-size: 1.6rem;
    font-weight: 900;
    color: #333;
}

.grid-wrapper {
    position: relative;
    padding: 20px;
    overflow-x: auto;
    max-width: 100%;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.6);
}

canvas {
    position: absolute;
    top: 0; left: 0;
    pointer-events: none;
    z-index: 0;
}

.main-grid {
    display: flex;
    gap: var(--gap);
    position: relative;
    z-index: 1;
}

.semester-col {
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: var(--w-col);
}

.sem-header {
    border: 2px solid #e0e0e0;
    margin-bottom: 5px;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.sem-title {
    background: linear-gradient(135deg, #f0f4ff 0%, #faf0ff 100%);
    text-align: center;
    font-weight: 900;
    font-size: 0.8rem;
    padding: 8px 0;
    border-bottom: 2px solid #e0e0e0;
    text-transform: uppercase;
    color: #0066dd;
    letter-spacing: 0.2px;
}

.sem-stats {
    display: flex;
    font-size: 0.65rem;
    text-align: center;
}

.stat-box {
    flex: 1;
    border-right: 1px solid #e0e0e0;
    padding: 4px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    font-weight: 500;
    color: #555;
}

.stat-box:last-child { border-right: none; }
.stat-val { font-weight: bold; font-size: 0.75rem; }

.subject {
    width: 100%;
    height: 75px;
    border: 2px solid #e0e0e0;
    background: white;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: all 0.15s ease;
    position: relative;
    z-index: 2;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.spacer {
    width: 100%;
    height: 75px;
    visibility: hidden;
    pointer-events: none;
}

.subject:hover {
    transform: translateY(-4px) scale(1.02);
    z-index: 10;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
    border-color: #ccc;
}

.subject.aprobada {
    opacity: 0.6;
    background-color: #f0f0f0 !important;
    border-color: #ddd;
}

.subject.cursando {
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.3), 0 2px 8px rgba(0, 0, 0, 0.1);
    border-color: #2196F3;
    z-index: 5;
}

.subject.reprobada {
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.3), 0 2px 8px rgba(0, 0, 0, 0.1);
    border-color: #f44336;
    z-index: 5;
}

.status-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    font-size: 1rem;
    z-index: 3;
    animation: pulse 2s infinite;
}

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

.sub-name {
    flex: 1;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2px 4px;
    color: black;
    line-height: 1;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.bg-blue .sub-name { background: var(--c-blue); color: white; }
.bg-teal .sub-name { background: var(--c-teal); color: white; }
.bg-green .sub-name { background: var(--c-green); color: white; }
.bg-yellow .sub-name { background: var(--c-yellow); color: #333; }
.bg-orange .sub-name { background: var(--c-orange); color: white; }
.bg-magenta .sub-name { background: var(--c-magenta); color: white; }
.bg-purple .sub-name { background: var(--c-purple); color: white; }

.sub-data { height: 32px; display: flex; flex-direction: column; }
.d-row { display: flex; flex: 1; border-bottom: 1px solid #e0e0e0; }
.d-row:last-child { border-bottom: none; }

.d-cell {
    flex: 1;
    border-right: 1px solid #e0e0e0;
    font-size: 0.55rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-weight: 500;
}

.d-cell:last-child { border-right: none; }

.footer-area {
    width: 100%;
    max-width: 1200px;
    margin-top: 40px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 25px;
    padding: 0 20px;
}

.legend {
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 16px;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: white;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
    font-weight: 600;
    color: #333;
}

.legend strong {
    font-size: 0.8rem;
    margin-bottom: 4px;
    color: #0066dd;
}

.l-item {
    display: flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s ease;
}

.l-item:hover {
    transform: translateX(4px);
}

.l-box {
    width: 14px;
    height: 14px;
    border: 1.5px solid rgba(0, 0, 0, 0.1);
    border-radius: 3px;
    flex-shrink: 0;
}

.extra-blocks {
    display: flex;
    gap: 15px;
    align-items: flex-end;
}

.special-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.mini-box {
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 0.5rem;
    padding: 6px 4px;
    text-align: center;
    width: 100%;
    font-weight: bold;
    background: linear-gradient(135deg, #f0f4ff 0%, #fff0f8 100%);
    color: #333;
}

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 100;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(2px);
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-box {
    background: white;
    padding: 28px;
    border-radius: 16px;
    width: 90%;
    max-width: 480px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

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

.modal-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid #f0f0f0;
}

.modal-header h3 {
    margin: 0 0 8px 0;
    color: #0066dd;
    font-size: 1.3rem;
    font-weight: 900;
}

.modal-meta {
    font-size: 0.85rem;
    color: #888;
    font-weight: 500;
}

.close-x {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 2rem;
    cursor: pointer;
    border: none;
    background: none;
    color: #ccc;
    line-height: 1;
    transition: color 0.2s ease;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-x:hover {
    color: #333;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 0.85rem;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 0.9rem;
    font-family: inherit;
    transition: all 0.2s ease;
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0066dd;
    box-shadow: 0 0 0 3px rgba(0, 102, 221, 0.1);
    background: #fafbff;
}

.modal-btn {
    width: 100%;
    margin-top: 16px;
    padding: 12px 16px;
    cursor: pointer;
    background: linear-gradient(135deg, #0066dd 0%, #0052a3 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: bold;
    transition: all 0.2s ease;
}

.modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 102, 221, 0.3);
}

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

@media (max-width: 768px) {
    h1 { font-size: 1.6rem; }
    .stats-bar { gap: 20px; }
    .footer-area { flex-direction: column; }
    .legend { max-width: 100%; }
    .modal-box { width: 95%; padding: 20px; }
}