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

:root {
    --primary: #1565C0;
    --primary-dark: #0D47A1;
    --primary-light: #E3F2FD;
    --primary-50: #F5F9FF;
    --gray-100: #F8F9FA;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-400: #CED4DA;
    --gray-500: #ADB5BD;
    --gray-600: #6C757D;
    --gray-700: #495057;
    --gray-800: #343A40;
    --gray-900: #212529;
    --white: #FFFFFF;
    --success: #28A745;
    --danger: #DC3545;
    --warning: #FFC107;
    --shadow: 0 2px 12px rgba(21, 101, 192, 0.08);
    --shadow-hover: 0 4px 20px rgba(21, 101, 192, 0.12);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
}

/* ============ NAVBAR ============ */
.navbar {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

.navbar-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.3px;
}

.navbar-brand svg {
    width: 28px;
    height: 28px;
}

.navbar-menu {
    display: flex;
    gap: 4px;
    list-style: none;
}

.navbar-menu li a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    text-decoration: none;
    transition: var(--transition);
}

.navbar-menu li a:hover,
.navbar-menu li a.active {
    background: var(--primary-light);
    color: var(--primary);
}

.navbar-menu li a svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--gray-700);
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
}

/* ============ MAIN CONTENT ============ */
.main-wrapper {
    max-width: 1280px;
    margin: 0 auto;
    padding: 88px 24px 48px;
}

.section {
    display: none;
}

.section.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============ HERO ============ */
.hero {
    text-align: center;
    padding: 60px 24px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--white) 100%);
    border-radius: var(--radius-lg);
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.hero p {
    font-size: 18px;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: 20px;
    font-size: 13px;
    color: var(--gray-600);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.feature-card svg {
    width: 36px;
    height: 36px;
    color: var(--primary);
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.5;
}

/* ============ SECTION HEADERS ============ */
.section-header {
    margin-bottom: 32px;
}

.section-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.3px;
    margin-bottom: 8px;
}

.section-header p {
    font-size: 16px;
    color: var(--gray-600);
}

/* ============ CARDS ============ */
.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 24px;
}

.card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card h3 svg {
    width: 22px;
    height: 22px;
    color: var(--primary);
    flex-shrink: 0;
}

/* ============ THEORY ============ */
.formula-box {
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px;
    margin: 16px 0;
    font-family: 'Courier New', monospace;
    font-size: 15px;
    text-align: center;
    color: var(--gray-800);
    overflow-x: auto;
}

.formula-label {
    display: block;
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.example-box {
    background: var(--primary-50);
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 16px 20px;
    margin: 12px 0;
}

.example-box strong {
    color: var(--primary-dark);
}

.theory-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

@media (max-width: 768px) {
    .theory-grid {
        grid-template-columns: 1fr;
    }
}

.step-list {
    list-style: none;
    counter-reset: step;
}

.step-list li {
    counter-increment: step;
    padding: 12px 0 12px 44px;
    position: relative;
    border-bottom: 1px solid var(--gray-200);
}

.step-list li:last-child {
    border-bottom: none;
}

.step-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 10px;
    width: 30px;
    height: 30px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
}

/* ============ TABLES ============ */
.table-container {
    overflow-x: auto;
    margin: 16px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

table thead {
    background: var(--gray-100);
}

table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-300);
    white-space: nowrap;
}

table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--gray-200);
    color: var(--gray-800);
}

table tbody tr:hover {
    background: var(--primary-50);
}

table .badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: #D4EDDA;
    color: #155724;
}

.badge-danger {
    background: #F8D7DA;
    color: #721C24;
}

/* ============ FORMS ============ */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    color: var(--gray-800);
    background: var(--white);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.12);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ============ BUTTONS ============ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 2px 8px rgba(21, 101, 192, 0.25);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-300);
}

.btn-success {
    background: var(--success);
    color: var(--white);
}

.btn-success:hover {
    background: #218838;
}

.btn-danger {
    background: var(--danger);
    color: var(--white);
}

.btn-danger:hover {
    background: #C82333;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-50);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ============ CHARTS ============ */
.chart-container {
    width: 100%;
    height: 400px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    background: var(--white);
}

.chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 900px) {
    .chart-grid {
        grid-template-columns: 1fr;
    }
}

/* ============ FILE UPLOAD ============ */
.file-upload {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.file-upload:hover {
    border-color: var(--primary);
    background: var(--primary-50);
}

.file-upload svg {
    width: 40px;
    height: 40px;
    color: var(--gray-500);
    margin-bottom: 12px;
}

.file-upload p {
    font-size: 14px;
    color: var(--gray-600);
}

.file-upload input {
    display: none;
}

/* ============ TRAINING STATUS ============ */
.training-status {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--primary-50);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    margin: 16px 0;
}

.training-status .spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.training-status .status-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-dark);
}

.training-status.success {
    background: #D4EDDA;
    border-color: var(--success);
}

.training-status.success .status-text {
    color: #155724;
}

.training-status.success .spinner {
    display: none;
}

/* ============ RESULT CARD ============ */
.result-card {
    text-align: center;
    padding: 32px;
    border-radius: var(--radius-lg);
    margin-top: 20px;
}

.result-card.aprobado {
    background: linear-gradient(135deg, #D4EDDA, #C3E6CB);
    border: 2px solid var(--success);
}

.result-card.reprobado {
    background: linear-gradient(135deg, #F8D7DA, #F5C6CB);
    border: 2px solid var(--danger);
}

.result-card .result-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.result-card .result-label {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 4px;
}

.result-card.aprobado .result-label {
    color: #155724;
}

.result-card.reprobado .result-label {
    color: #721C24;
}

.result-card .result-probability {
    font-size: 16px;
    color: var(--gray-600);
}

.result-card .result-detail {
    font-size: 14px;
    color: var(--gray-600);
    margin-top: 12px;
}

/* ============ TEAM ============ */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}

.team-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}

.team-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.team-photo-wrapper {
    width: 180px;
    height: 270px;
    overflow: hidden;
    margin: 0 auto 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    background: var(--gray-100);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.team-photo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    background: var(--white);
}

.team-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.team-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.team-card .team-role {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 8px;
}

.team-card .team-desc {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.5;
}

/* ============ METRICS ============ */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin: 16px 0;
}

.metric-card {
    text-align: center;
    padding: 20px;
    background: var(--gray-100);
    border-radius: var(--radius);
}

.metric-card .metric-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

.metric-card .metric-label {
    font-size: 13px;
    color: var(--gray-600);
    margin-top: 4px;
}

/* ============ ALERTS ============ */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius);
    font-size: 14px;
    margin: 12px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-info {
    background: var(--primary-light);
    color: var(--primary-dark);
    border: 1px solid #BBDEFB;
}

.alert-warning {
    background: #FFF3CD;
    color: #856404;
    border: 1px solid #FFEEBA;
}

.alert-error {
    background: #F8D7DA;
    color: #721C24;
    border: 1px solid #F5C6CB;
}

/* ============ MODAL ============ */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.modal h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.modal p {
    font-size: 14px;
    color: var(--gray-600);
    margin-bottom: 20px;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .navbar-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--white);
        border-bottom: 1px solid var(--gray-200);
        padding: 8px 16px;
        flex-direction: column;
        box-shadow: var(--shadow);
    }

    .navbar-menu.open {
        display: flex;
    }

    .hero h1 {
        font-size: 26px;
    }

    .hero p {
        font-size: 16px;
    }

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

    .section-header h2 {
        font-size: 22px;
    }
}

/* ============ UTILITY ============ */
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.text-center { text-align: center; }
.text-muted { color: var(--gray-600); }
.fw-600 { font-weight: 600; }

.empty-state {
    text-align: center;
    padding: 40px 24px;
    color: var(--gray-500);
}

.empty-state svg {
    width: 48px;
    height: 48px;
    margin-bottom: 12px;
}

.empty-state p {
    font-size: 15px;
}

code {
    background: var(--gray-100);
    color: var(--primary-dark);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    font-family: 'Courier New', monospace;
}

/* ============ FLOWCHART DIAGRAM ============ */
.flowchart {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 8px 0;
}

.flow-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.flow-node-inner {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    width: 100%;
    max-width: 680px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px 24px;
    transition: var(--transition);
}

.flow-node-inner:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}

.flow-badge {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    margin-top: 2px;
}

.flow-badge-purple {
    background: #7C3AED;
}

.flow-badge-teal {
    background: #0D9488;
}

.flow-badge-green {
    background: var(--success);
}

.flow-body {
    flex: 1;
    min-width: 0;
}

.flow-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.flow-title svg {
    width: 18px;
    height: 18px;
    color: var(--primary);
    flex-shrink: 0;
}

.flow-desc {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
}

.flow-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    color: var(--gray-400);
}

.flow-arrow svg {
    width: 24px;
    height: 24px;
}

/* Split (side-by-side steps 3 & 4) */
.flow-split {
    display: flex;
    align-items: stretch;
    gap: 12px;
    width: 100%;
}

.flow-split-box {
    flex: 1;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px 24px;
    transition: var(--transition);
}

.flow-split-box:hover {
    border-color: #7C3AED;
    box-shadow: var(--shadow-hover);
}

.flow-split-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 28px;
    color: var(--gray-400);
}

.flow-split-divider svg {
    width: 20px;
    height: 20px;
}

.flow-split-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--gray-500);
    text-align: center;
    margin-bottom: 8px;
    width: 100%;
}

@media (max-width: 640px) {
    .flow-split {
        flex-direction: column;
    }

    .flow-split-divider {
        width: 100%;
        height: 24px;
    }

    .flow-split-divider svg {
        transform: rotate(90deg);
    }

    .flow-node-inner {
        padding: 16px;
    }
}

/* ============ FILE DETAIL LIST ============ */
.file-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.file-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 16px;
    background: var(--gray-100);
    border-radius: var(--radius);
    transition: var(--transition);
}

.file-item:hover {
    background: var(--primary-50);
}

.file-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px;
}

.file-icon svg {
    width: 20px;
    height: 20px;
}

.file-icon-html { background: #E44D26; color: #fff; }
.file-icon-css { background: #1572B6; color: #fff; }
.file-icon-js { background: #F7DF1E; color: #323330; }
.file-icon-csv { background: #217346; color: #fff; }
.file-icon-folder { background: #FFA000; color: #fff; }

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.file-desc {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.5;
}