@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --hw-charcoal: #1e1e1e;
    --hw-dark: #2d2d2d;
    --hw-graphite: #4a4a4a;
    --hw-gray: #656f77;
    --hw-light-gray: #8c939a;
    --hw-silver: #b8bdc2;
    --hw-off-white: #f5f5f0;
    --hw-white: #ffffff;
    --hw-border: #e0e0e0;
    
    --accent-dark: #3a3a3a;
    --success: #4a7c59;
    --warning: #b8860b;
    --info: #5a6c7d;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.7;
    color: var(--hw-charcoal);
    background: var(--hw-white);
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 920px;
    margin: 0 auto;
    padding: 0 40px 60px;
}

.back-link {
    position: fixed;
    top: 20px;
    left: 20px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--hw-charcoal);
    color: var(--hw-white);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.3px;
    z-index: 1000;
    transition: all 0.3s ease;
    border: none;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.back-link:hover {
    background: var(--hw-graphite);
    transform: translateX(-3px);
}

.cover {
    text-align: center;
    padding: 100px 50px 80px;
    background: linear-gradient(145deg, var(--hw-off-white) 0%, #e8e8e3 40%, #ddddd8 100%);
    color: var(--hw-charcoal);
    margin: 0 -40px 50px;
    position: relative;
    border-bottom: 1px solid var(--hw-border);
}

.cover::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--hw-silver), var(--hw-gray), var(--hw-silver));
}

.cover h1 {
    font-size: 2.2rem;
    font-weight: 300;
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 20px;
    color: var(--hw-charcoal);
    border: none;
}

.cover .subtitle {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--hw-graphite);
    margin-bottom: 10px;
}

.cover p {
    font-size: 0.95rem;
    color: var(--hw-gray);
    margin: 8px 0;
    text-align: center;
}

.cover .version {
    display: inline-block;
    padding: 10px 28px;
    margin-top: 25px;
    background: rgba(0,0,0,0.05);
    border: 1px solid var(--hw-border);
    font-size: 0.85rem;
    color: var(--hw-graphite);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.cover .institution {
    margin-top: 40px;
    font-size: 0.9rem;
    color: var(--hw-light-gray);
    font-weight: 300;
}

.cover-tags {
    margin-top: 20px;
    color: var(--hw-gray);
    font-size: 0.95rem;
}

h1, h2, h3, h4 { 
    color: var(--hw-charcoal);
    font-weight: 600;
    line-height: 1.3;
}

h1 { 
    font-size: 1.6rem;
    margin-top: 50px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--hw-graphite);
}

h2 { 
    font-size: 1.25rem;
    margin-top: 40px;
    margin-bottom: 15px;
    padding-left: 15px;
    border-left: 3px solid var(--hw-gray);
    color: var(--hw-dark);
}

h3 { 
    font-size: 1.05rem;
    margin-top: 25px;
    margin-bottom: 12px;
    color: var(--hw-graphite);
    font-weight: 500;
}

h4 {
    font-size: 0.95rem;
    margin-top: 20px;
    color: var(--hw-gray);
}

p { 
    margin: 15px 0;
    text-align: justify;
    color: var(--hw-dark);
}

strong {
    font-weight: 600;
    color: var(--hw-charcoal);
}

.toc {
    background: var(--hw-off-white);
    padding: 35px 40px;
    margin: 40px 0;
    border: 1px solid var(--hw-border);
}

.toc h2 { 
    margin: 0 0 25px 0;
    padding: 0;
    border: none;
    text-align: center;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--hw-graphite);
}

.toc ul {
    list-style: none;
    margin: 0;
    padding: 0;
    columns: 2;
    column-gap: 40px;
}

.toc li {
    padding: 10px 0;
    border-bottom: 1px dotted var(--hw-border);
    break-inside: avoid;
}

.toc li::before {
    content: none;
}

.toc a {
    color: var(--hw-dark);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    display: block;
}

.toc a:hover {
    color: var(--hw-graphite);
    padding-left: 8px;
}

.info-box, .warning-box, .success-box {
    padding: 20px 25px;
    margin: 25px 0;
    border-left: 4px solid;
    background: var(--hw-off-white);
}

.info-box {
    border-color: var(--hw-gray);
}

.warning-box {
    border-color: var(--warning);
    background: #faf8f0;
}

.success-box {
    border-color: var(--success);
    background: #f5f9f6;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    font-size: 0.9rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

th, td {
    padding: 14px 18px;
    text-align: left;
    border: 1px solid var(--hw-border);
}

th {
    background: var(--hw-charcoal);
    color: var(--hw-white);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    background: var(--hw-white);
}

tr:nth-child(even) td { 
    background: var(--hw-off-white);
}

tr:hover td {
    background: #eef0eb;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin: 20px 0;
    padding: 22px 25px;
    background: var(--hw-off-white);
    border: 1px solid var(--hw-border);
    transition: all 0.2s ease;
}

.step:hover {
    border-color: var(--hw-gray);
    box-shadow: 0 3px 12px rgba(0,0,0,0.06);
}

.step-number {
    background: var(--hw-graphite);
    color: var(--hw-white);
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.step-content h4 { 
    margin: 0 0 8px 0;
    color: var(--hw-charcoal);
    font-size: 1rem;
}

.step-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--hw-gray);
}

ul, ol {
    margin: 18px 0 18px 25px;
}

li { 
    margin: 10px 0;
    padding-left: 5px;
}

li::marker {
    color: var(--hw-gray);
}

code {
    font-family: 'SF Mono', 'Consolas', monospace;
    background: #f0f1ec;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--hw-graphite);
}

pre {
    background: var(--hw-charcoal);
    color: #e8e8e8;
    padding: 25px;
    margin: 25px 0;
    overflow-x: auto;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    border-left: 4px solid var(--hw-gray);
}

.tech-stack {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.tech-item {
    background: var(--hw-off-white);
    padding: 22px;
    border: 1px solid var(--hw-border);
    border-left: 4px solid var(--hw-graphite);
    transition: all 0.2s ease;
}

.tech-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.tech-item h4 {
    margin: 0 0 12px 0;
    font-size: 0.95rem;
    color: var(--hw-charcoal);
}

.tech-item ul {
    margin: 0;
    padding-left: 18px;
}

.tech-item li {
    font-size: 0.85rem;
    margin: 6px 0;
    color: var(--hw-gray);
}

.diagram-content, .mermaid {
    background: var(--hw-off-white);
    padding: 30px;
    margin: 25px 0;
    border: 1px solid var(--hw-border);
    text-align: center;
    overflow-x: auto;
}

.diagram-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--hw-charcoal);
    margin: 30px 0 15px;
    padding: 12px 20px;
    background: var(--hw-off-white);
    border-left: 4px solid var(--hw-graphite);
}

.mockup-container, .wireframe {
    background: var(--hw-off-white);
    border: 1px solid var(--hw-border);
    padding: 30px;
    margin: 25px 0;
}

.wireframe-element {
    background: var(--hw-white);
    border: 1px solid var(--hw-border);
    margin: 10px 0;
    padding: 15px;
}

.annotation {
    background: #f8f8f5;
    border: 1px solid var(--hw-border);
    padding: 20px;
    margin: 20px 0;
    font-size: 0.9rem;
}

.test-case {
    background: var(--hw-white);
    border: 1px solid var(--hw-border);
    margin: 20px 0;
    overflow: hidden;
}

.test-header {
    background: var(--hw-charcoal);
    color: var(--hw-white);
    padding: 12px 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.test-body {
    padding: 20px;
}

.test-result {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.test-result.pass {
    background: #e8f5e9;
    color: var(--success);
}

.test-result.fail {
    background: #ffebee;
    color: #c62828;
}

.reference, .reference-item {
    padding: 18px 20px;
    margin: 15px 0;
    background: var(--hw-off-white);
    border-left: 3px solid var(--hw-gray);
    font-size: 0.9rem;
    line-height: 1.6;
}

.reference-category {
    margin: 30px 0;
}

.apa-note {
    background: #f8f8f5;
    border: 1px solid var(--hw-border);
    padding: 20px;
    margin: 25px 0;
    font-size: 0.9rem;
}

.tech-badge, .actor-badge, .status-badge {
    display: inline-block;
    padding: 5px 12px;
    margin: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 4px;
}

.tech-badge {
    background: var(--hw-off-white);
    color: var(--hw-graphite);
    border: 1px solid var(--hw-border);
}

.tech-frontend { background: #e3e8ed; }
.tech-backend { background: #e8e5e0; }
.tech-database { background: #e0e8e5; }
.tech-security { background: #e8e8e0; }

.actor-badge {
    background: var(--hw-graphite);
    color: var(--hw-white);
}

.actor-alumno { background: #5a6c7d; }
.actor-profesor { background: #4a5a6a; }
.actor-admin { background: #3a4a5a; }
.actor-gestor { background: #2a3a4a; }

.legend {
    background: var(--hw-off-white);
    padding: 20px;
    margin: 25px 0;
    border: 1px solid var(--hw-border);
}

.legend h4 {
    margin: 0 0 15px 0;
    font-size: 0.95rem;
}

.legend ul {
    margin: 0;
    padding-left: 20px;
}

.layer-box, .component-box {
    background: var(--hw-off-white);
    border: 1px solid var(--hw-border);
    padding: 20px;
    margin: 15px 0;
}

.layer-box h4, .component-box h4 {
    margin: 0 0 10px 0;
    color: var(--hw-charcoal);
}

.footer {
    margin-top: 60px;
    padding: 25px 0;
    border-top: 2px solid var(--hw-border);
    text-align: center;
    color: var(--hw-gray);
    font-size: 0.85rem;
}

.footer p {
    margin: 5px 0;
    text-align: center;
}

@media print {
    .back-link {
        display: none !important;
    }
    
    .container { 
        padding: 20px;
        max-width: 100%;
    }
    
    .cover { 
        margin: 0 0 30px 0;
        padding: 50px 30px;
    }
    
    .step, .info-box, .warning-box, table { 
        break-inside: avoid;
    }
    
    h1, h2 {
        break-after: avoid;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px 40px;
    }
    
    .back-link {
        top: 10px;
        left: 10px;
        padding: 8px 14px;
        font-size: 12px;
    }
    
    .cover {
        margin: 0 -20px 40px;
        padding: 80px 25px 60px;
    }
    
    .cover h1 {
        font-size: 1.6rem;
        letter-spacing: 2px;
    }
    
    h1 {
        font-size: 1.4rem;
    }
    
    h2 {
        font-size: 1.15rem;
    }
    
    .toc ul {
        columns: 1;
    }
    
    .step {
        flex-direction: column;
        gap: 15px;
    }
    
    table {
        font-size: 0.8rem;
    }
    
    th, td {
        padding: 10px 12px;
    }
    
    .tech-stack {
        grid-template-columns: 1fr;
    }
}