:root {
    --bg: #0f172a;
    --bg-darker: #0b1120;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #38bdf8;
    --secondary: #94a3b8;
    --card: #1e293b;
    --border: #334155;
}

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

/* --- 1. BASE PARA TODO EL SITIO --- */
body, html {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* --- 2. REGLAS PARA LA HOME (index.html) --- */
body:not(.project-details-page) {
    height: 100vh;
    overflow: hidden;
}

body:not(.project-details-page) .app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* --- 3. REGLAS PARA PÁGINAS DE PROYECTO (cellectia.html) --- */
body.project-details-page {
    height: auto !important;
    min-height: 100vh !important;
    overflow-y: auto !important;
    overflow-x: hidden;
    position: relative; 
}

body.project-details-page .app-container {
    display: block !important; 
    height: auto !important;
    min-height: 100vh;
}

.standalone-project {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 1.5rem 10rem 1.5rem;
    position: relative;
}

/* --- 4. COMPONENTES COMUNES --- */
.sidebar {
    width: 280px;
    background-color: var(--bg-darker);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 2.5rem 1.5rem;
}

.profile-section { text-align: center; margin-bottom: 3rem; }
.profile-img-small { width: 110px; height: 110px; border-radius: 50%; border: 3px solid var(--primary); object-fit: cover; margin-bottom: 1rem; }
h1 { font-size: 1.35rem; line-height: 1.3; margin-bottom: 0.3rem;} 
.tagline { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.4rem; }

.vertical-nav { display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
.nav-btn {
    background: transparent; border: none; color: var(--text-muted); text-align: left;
    padding: 0.8rem 1rem; font-size: 0.95rem; font-family: inherit; font-weight: 600;
    border-radius: 8px; cursor: pointer; transition: 0.3s; display: flex; align-items: center; gap: 12px;
}
.nav-btn.active { background: rgba(56, 189, 248, 0.1); color: var(--primary); border-right: 3px solid var(--primary); border-radius: 8px 0 0 8px; }
.nav-btn:hover:not(.active) { background: var(--card); color: var(--text); }

.social-quick { display: flex; justify-content: center; gap: 1.5rem; }
.social-quick a { color: var(--text-muted); font-size: 1.3rem; transition: 0.3s; }
.social-quick a:hover { color: var(--primary); transform: translateY(-3px); }

/* CONTENT AREA HOME */
.content-area { flex: 1; padding: 4rem; overflow-y: auto; background: var(--bg); }
.tab-content { display: none; animation: fadeIn 0.4s ease; }
.tab-content.active { display: block; }

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

h2 { font-size: 2rem; margin-bottom: 2rem; position: relative; }
h2::after { content: ''; position: absolute; width: 40px; height: 3px; bottom: -8px; left: 0; background: var(--primary); }

/* --- SECCIÓN SOBRE MÍ Y STACK --- */
.about-grid-modern { 
    display: flex; 
    flex-direction: column; 
    gap: 3rem; 
}

/* AQUÍ ESTÁN LAS REGLAS DE LAS CAJITAS QUE SE HABÍAN BORRADO */
.about-text p { margin-bottom: 1.2rem; color: #cbd5e0; }
.soft-skills { display: flex; flex-direction: column; gap: 10px; margin-top: 1.5rem; font-size: 0.9rem; }
.soft-skills span i { color: var(--primary); margin-right: 8px; }

.skills-grid { 
    display: flex; 
    flex-wrap: wrap; 
    gap: 10px; 
}
.tag { 
    background: var(--card); 
    padding: 0.5rem 0.8rem; 
    border-radius: 6px; 
    border: 1px solid var(--border); 
    font-size: 0.85rem; 
    display: inline-flex; 
    align-items: center; 
    gap: 8px; 
    color: var(--text);
}

/* EL STACK TECNOLÓGICO PANORÁMICO */
.tech-stack-container {
    width: 100%;
    margin-top: 1rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border); 
}
.tech-stack-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2.5rem;
}
.tech-category {
    margin-bottom: 0; 
}
.category-title {
    font-size: 0.85rem;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    font-weight: 700;
}

/* --- GRID DE PROYECTOS --- */
.projects-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); 
    gap: 2rem; 
}

.project-card-link { 
    text-decoration: none; color: inherit; background: var(--card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; display: flex; flex-direction: column; transition: all 0.3s ease; 
}
.project-card-link:hover { transform: translateY(-5px); border-color: var(--primary); }

.project-card-thumb { height: 180px; background: #141e30; display: flex; align-items: center; justify-content: center; overflow: hidden; border-bottom: 1px solid var(--border); padding: 10px;}
.thumb-img { width: 100%; height: 100%; object-fit: contain; opacity: 0.9; transition: 0.3s; }

.project-card-content { padding: 1.5rem; display: flex; flex-direction: column; flex: 1; }
.project-card-content h3 { font-size: 1.2rem; margin-bottom: 0.5rem; color: var(--text); }
.project-card-content p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 1.5rem; flex: 1; }

.tech-icons { display: flex; justify-content: center; align-items: center; gap: 15px; flex-wrap: wrap; border-top: 1px solid var(--border); padding-top: 1.2rem; }
.tech-tag { display: flex; align-items: center; gap: 6px; color: var(--text-muted); font-size: 0.8rem; font-weight: 500;}
.tech-tag i { font-size: 1rem; color: var(--primary); }

/* BOTONES */
.btn { padding: 0.7rem 1.5rem; border-radius: 6px; text-decoration: none; font-weight: 700; display: inline-flex; align-items: center; gap: 8px; transition: 0.3s; font-size: 0.9rem;}
.primary { background: var(--primary); color: var(--bg); border: 2px solid var(--primary); }
.secondary { border: 2px solid var(--border); color: var(--text); }
.secondary:hover { border-color: var(--primary); color: var(--primary); }

/* TIMELINE */
.timeline { border-left: 2px solid var(--border); padding-left: 1.5rem; margin-top: 1rem; }
.timeline-item { position: relative; margin-bottom: 2rem; }
.timeline-item::before { content: ''; position: absolute; left: -25px; top: 5px; width: 12px; height: 12px; border-radius: 50%; background: var(--primary); border: 3px solid var(--bg); }
.timeline-date { color: var(--primary); font-weight: 700; font-size: 0.85rem; }

/* CONTACTO */
.contact-card { background: var(--card); padding: 3rem; border-radius: 12px; border: 1px solid var(--border); text-align: center; max-width: 600px; margin: 2rem auto; }

/* REGLAS ESPECÍFICAS DE CELLECTIA.HTML */
.project-header-large h1 { font-size: 2.5rem; margin-bottom: 1rem; }
.project-full-details h3 { color: var(--text); margin-top: 2rem; margin-bottom: 1rem; font-size: 1.4rem;}

/* --- 5. MOBILE --- */
@media (max-width: 800px) {
    .app-container { flex-direction: column !important; height: auto !important; }
    body, html { height: auto !important; overflow: visible !important; }
    .sidebar { width: 100%; padding: 1.5rem; height: auto; }
    .vertical-nav { flex-direction: row; flex-wrap: wrap; justify-content: center; }
    .content-area { padding: 2rem; }
}