:root {
    --color-abyss: #0A0A0B;
    --color-tungsten: #22252A;
    --color-porcelain: #F5F5F7;
    --color-silver-foil: #AAB0B3;
    --color-sovereign-gold: #B89A5B;
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --font-tech: 'Roboto Mono', monospace;
    --spacing-unit: 8px;
    --transition-speed: 0.5s;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--color-abyss);
    color: var(--color-porcelain);
    font-family: var(--font-body);
    font-weight: 300;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

#persistent-video-bg {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    transform: translate(-50%, -50%);
    z-index: -1;
    opacity: 0.2; /* LIGERO AJUSTE: Aumentado para mayor intensidad del video base. */
    filter: grayscale(100%) contrast(1.2);
}

section {
    min-height: 100vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: calc(var(--spacing-unit) * 12) calc(var(--spacing-unit) * 6);
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid rgba(184, 154, 91, 0.1);
}

section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    /* CALIBRACIÓN PRINCIPAL: El valor de opacidad (el último número) se ha reducido de 0.92 a 0.75. */
    /* Esto hace que el velo oscuro sobre el video sea más transparente. */
    background-color: rgba(10, 10, 11, 0.75); 
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-porcelain);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

h1 {
    font-size: clamp(2.5rem, 8vw, 5rem);
    line-height: 1.1;
    color: var(--color-porcelain);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    line-height: 1.2;
    color: var(--color-sovereign-gold);
}

h3 {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    line-height: 1.3;
    font-weight: 500;
}

p {
    margin-bottom: calc(var(--spacing-unit) * 2);
    max-width: 70ch;
    margin-left: auto;
    margin-right: auto;
    color: var(--color-silver-foil);
}

.subtitle {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: var(--color-silver-foil);
    text-transform: none;
    letter-spacing: 1px;
    margin: 0 auto;
}

.hero-divider {
    width: 80px;
    height: 1px;
    background: var(--color-sovereign-gold);
    margin: calc(var(--spacing-unit) * 4) auto;
}

/* Header & Nav */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 6);
    z-index: 1000;
    background: rgba(10, 10, 11, 0.5);
    backdrop-filter: blur(10px);
    transition: background-color var(--transition-speed);
}

.logo {
    font-family: var(--font-tech);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--color-porcelain);
}

.main-nav {
    display: flex;
    gap: calc(var(--spacing-unit) * 4);
}

.nav-link {
    color: var(--color-silver-foil);
    text-decoration: none;
    font-family: var(--font-tech);
    text-transform: uppercase;
    font-size: 0.9rem;
    transition: color var(--transition-speed);
    position: relative;
    padding-bottom: var(--spacing-unit);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-sovereign-gold);
    transition: width var(--transition-speed) ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-porcelain);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

#mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

#mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-porcelain);
    margin: 5px 0;
    transition: all 0.3s ease-in-out;
}

/* Section Specific Styles */
.section-title {
    margin-bottom: calc(var(--spacing-unit) * 6);
}
.section-subtitle {
    margin-top: calc(var(--spacing-unit) * -4);
    margin-bottom: calc(var(--spacing-unit) * 6);
    max-width: 80ch;
}

#philosophy::before { background-color: rgba(34, 37, 42, 0.85); } /* Ajuste ligero para esta sección específica */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}
.philosophy-card {
    background: var(--color-tungsten);
    padding: calc(var(--spacing-unit) * 4);
    border-left: 3px solid var(--color-sovereign-gold);
    text-align: left;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}
.philosophy-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}
.philosophy-card h3 { color: var(--color-porcelain); }

#experience {
    padding-top: calc(var(--spacing-unit) * 15);
    padding-bottom: calc(var(--spacing-unit) * 15);
}
.experience-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
}
.experience-timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--color-tungsten);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}
.timeline-item {
    padding: calc(var(--spacing-unit)*2) calc(var(--spacing-unit)*5);
    position: relative;
    background-color: inherit;
    width: 50%;
}
.timeline-item:nth-child(odd) { left: 0; }
.timeline-item:nth-child(even) { left: 50%; }
.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--color-abyss);
    border: 3px solid var(--color-sovereign-gold);
    top: 25px;
    border-radius: 50%;
    z-index: 1;
}
.timeline-item:nth-child(even)::after { left: -10px; }
.timeline-content {
    padding: calc(var(--spacing-unit)*2) calc(var(--spacing-unit)*3);
    background-color: var(--color-tungsten);
    position: relative;
}
.timeline-content h3 { font-size: 1.2rem; }
.timeline-content h4 { color: var(--color-sovereign-gold); font-family: var(--font-tech); font-size: 0.9rem; margin-bottom: var(--spacing-unit); }
.timeline-content ul { list-style: none; padding-left: 0; }
.timeline-content ul li {
    padding-left: calc(var(--spacing-unit)*2);
    position: relative;
    margin-bottom: var(--spacing-unit);
    color: var(--color-silver-foil);
}
.timeline-content ul li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--color-sovereign-gold);
}
.timeline-date {
    position: absolute;
    top: 22px;
    width: 150px;
    text-align: center;
    font-family: var(--font-tech);
    color: var(--color-silver-foil);
    font-size: 0.9rem;
    z-index: 2;
}
.timeline-item:nth-child(odd) .timeline-date { right: -200px; }
.timeline-item:nth-child(even) .timeline-date { left: -200px; }

#competencies::before { background-color: rgba(34, 37, 42, 0.85); } /* Ajuste ligero para esta sección específica */
.competencies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 5);
    margin-top: calc(var(--spacing-unit) * 2);
}
.competency-card {
    background: transparent;
    border: 1px solid var(--color-tungsten);
    padding: calc(var(--spacing-unit) * 5);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}
.competency-card:hover {
    background-color: var(--color-tungsten);
    border-color: var(--color-sovereign-gold);
}
.competency-icon {
    width: 50px;
    height: 50px;
    margin-bottom: calc(var(--spacing-unit) * 3);
    filter: invert(81%) sepia(15%) saturate(1069%) hue-rotate(357deg) brightness(88%) contrast(89%);
}
.competency-card h3 { color: var(--color-porcelain); }

#contact {
    min-height: auto;
    padding-top: calc(var(--spacing-unit) * 15);
    padding-bottom: calc(var(--spacing-unit) * 15);
}
.contact-info-grid {
    display: flex;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 6);
    margin-top: calc(var(--spacing-unit) * 5);
    flex-wrap: wrap;
}
.contact-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit) * 2;
}
.contact-icon {
    width: 24px;
    height: 24px;
    filter: invert(74%) sepia(6%) saturate(636%) hue-rotate(162deg) brightness(92%) contrast(88%);
}
.contact-info-item a, .contact-info-item span {
    font-family: var(--font-tech);
    color: var(--color-porcelain);
    text-decoration: none;
    font-size: 1.1rem;
    transition: color var(--transition-speed);
}
.contact-info-item a:hover { color: var(--color-sovereign-gold); }
.references {
    margin-top: calc(var(--spacing-unit) * 8);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    background: rgba(34, 37, 42, 0.5);
    padding: calc(var(--spacing-unit) * 4);
    border-left: 2px solid var(--color-sovereign-gold);
}
.references h3 { font-size: 1.2rem; }
.references p { font-style: italic; font-size: 0.9rem; }
.references ul { list-style: none; padding: 0; margin-top: var(--spacing-unit); }
.references li { color: var(--color-silver-foil); }

footer {
    width: 100vw;
    background-color: var(--color-abyss);
    padding: calc(var(--spacing-unit)*4);
    text-align: center;
    color: var(--color-silver-foil);
    font-size: 0.8rem;
}
footer p { font-size: 0.8rem; max-width: 100%; }

/* Animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    transition-delay: var(--delay, 0s);
}
.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 900px) {
    .main-nav { display: none; }
    #mobile-menu-btn { display: block; }
    .main-header.nav-open .main-nav {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: 0;
        width: 100%;
        height: 100vh;
        background: var(--color-abyss);
        justify-content: center;
        align-items: center;
    }
    .main-header.nav-open .nav-link { font-size: 1.5rem; }
    #mobile-menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    #mobile-menu-btn.open span:nth-child(2) { opacity: 0; }
    #mobile-menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    .experience-timeline::after { left: 31px; }
    .timeline-item { width: 100%; padding-left: 70px; padding-right: 25px; }
    .timeline-item:nth-child(even) { left: 0; }
    .timeline-item::after { left: 21px; }
    .timeline-date {
        position: relative;
        top: auto;
        left: auto !important;
        right: auto !important;
        width: auto;
        text-align: left;
        margin-bottom: var(--spacing-unit);
        color: var(--color-sovereign-gold);
    }
}