:root {
    --brand-primary: #0B1F3A;
    --brand-accent: #42B3FF;
    --bs-body-font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --bs-primary: var(--brand-primary);
    --bs-primary-rgb: 11, 31, 58;
    --transition-base: 0.3s ease;
}

/* Utilidades de accesibilidad */
.sr-only,
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Mejorar contraste de enlaces */
a:not(.btn) {
    color: var(--bs-primary);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

a:not(.btn):hover,
a:not(.btn):focus-visible {
    color: var(--brand-accent);
    text-decoration-thickness: 2px;
}

/* Mejorar contraste de botones */
.btn-primary {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: #ffffff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background-color: #0a1a33;
    border-color: #0a1a33;
    color: #ffffff;
}

.btn-outline-primary {
    color: var(--bs-primary);
    border-color: var(--bs-primary);
}

.btn-outline-primary:hover,
.btn-outline-primary:focus-visible {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: #ffffff;
}

body {
    font-family: var(--bs-body-font-family);
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    line-height: 1.6;
}

section {
    scroll-margin-top: 6rem;
}

/* Ajustes responsive base */
@media (max-width: 575.98px) {
    section {
        scroll-margin-top: 4.5rem;
    }
}

.navbar-brand {
    letter-spacing: 0.04em;
}

.btn, .card, .achievement-card, .skill-card, .timeline-item {
    transition: transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base), color var(--transition-base);
}

.btn:hover, .btn:focus-visible {
    transform: translateY(-1px);
}

.avatar-wrapper {
    max-width: 320px;
    position: relative;
}

/* Avatar responsive */
@media (max-width: 575.98px) {
    .avatar-wrapper {
        max-width: 240px;
    }
}

@media (min-width: 576px) and (max-width: 767.98px) {
    .avatar-wrapper {
        max-width: 280px;
    }
}

.avatar-wrapper::after {
    display: none;
}

#projects-grid .card {
    height: 100%;
    border: none;
    box-shadow: 0 0.75rem 1.5rem rgba(11, 31, 58, 0.08);
}

#projects-grid .card:hover,
#projects-grid .card:focus-within {
    transform: translateY(-4px);
    box-shadow: 0 1.25rem 2rem rgba(11, 31, 58, 0.12);
}

.badge.text-bg-primary {
    background-color: var(--brand-primary) !important;
}

.skill-card,
.achievement-card {
    border-radius: 1rem;
    padding: 1.25rem;
    background-color: var(--bs-body-bg);
    border: 1px solid rgba(11, 31, 58, 0.08);
    box-shadow: 0 0.5rem 1rem rgba(11, 31, 58, 0.06);
}

/* Cards responsive */
@media (max-width: 575.98px) {
    .skill-card,
    .achievement-card {
        padding: 1rem;
        border-radius: 0.75rem;
    }
}

.timeline {
    position: relative;
    padding-left: 1.5rem;
}

.timeline::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: -0.875rem;
    width: 2px;
    background: linear-gradient(180deg, rgba(11, 31, 58, 0.1), rgba(66, 179, 255, 0.2));
}

.timeline-item {
    position: relative;
    padding-bottom: 2rem;
}

.timeline-marker {
    position: absolute;
    left: -1.25rem;
    top: 0.15rem;
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 50%;
    background-color: transparent;
    border: 2px solid var(--brand-accent);
    box-shadow: none;
}

/* Timeline responsive */
@media (max-width: 575.98px) {
    .timeline {
        padding-left: 1.25rem;
    }
    
    .timeline::before {
        left: -0.625rem;
    }
    
    .timeline-marker {
        left: -1rem;
        width: 0.625rem;
        height: 0.625rem;
    }
    
    .timeline-item {
        padding-bottom: 1.5rem;
    }
    
    .timeline-content ul {
        padding-left: 1rem;
    }
}

.timeline-content ul {
    padding-left: 1.25rem;
}

.list-unstyled li + li {
    margin-top: 0.5rem;
}

#formAlert[role="alert"] {
    transition: opacity var(--transition-base);
}

button[data-theme-toggle] {
    min-width: 3.5rem;
}

/* Botones responsive - área táctil mínima 44x44px */
@media (max-width: 991.98px) {
    .btn {
        min-height: 44px;
        padding: 0.5rem 1rem;
    }
    
    .btn-sm {
        min-height: 40px;
        padding: 0.375rem 0.75rem;
    }
    
    button[data-theme-toggle] {
        min-width: 44px;
        min-height: 44px;
    }
}

@media (max-width: 575.98px) {
    .btn {
        font-size: 0.95rem;
        padding: 0.625rem 1rem;
    }
    
    .d-flex.flex-wrap.gap-3 {
        gap: 0.75rem !important;
    }
    
    .d-flex.flex-wrap.gap-3 .btn {
        flex: 1 1 auto;
        min-width: calc(50% - 0.375rem);
    }
}

:focus-visible {
    outline: 3px solid var(--brand-accent);
    outline-offset: 2px;
}

/* Navegación responsive */
@media (max-width: 991.98px) {
    .navbar-collapse {
        padding-top: 1rem;
        padding-bottom: 1rem;
    }
    
    .navbar-nav {
        gap: 0.5rem;
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem;
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .navbar-nav .nav-item.ms-lg-3 {
        margin-left: 0 !important;
        margin-top: 0.5rem;
    }
    
    .navbar-nav .nav-item.ms-lg-3 button {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 575.98px) {
    .navbar-brand {
        font-size: 1.1rem;
    }
    
    .navbar-toggler {
        padding: 0.375rem 0.5rem;
        min-width: 44px;
        min-height: 44px;
    }
}

/* Hero section responsive */
@media (max-width: 991.98px) {
    #hero h1.display-5 {
        font-size: 2rem;
    }
    
    #hero h2.h4 {
        font-size: 1.1rem;
    }
    
    #hero .lead {
        font-size: 1rem;
    }
}

@media (max-width: 575.98px) {
    #hero {
        padding-top: 2rem !important;
        padding-bottom: 2rem !important;
    }
    
    #hero h1.display-5 {
        font-size: 1.75rem;
        line-height: 1.2;
    }
    
    #hero h2.h4 {
        font-size: 1rem;
    }
    
    #hero .lead {
        font-size: 0.95rem;
    }
    
    #hero .badge {
        font-size: 0.75rem;
        padding: 0.4rem 0.75rem;
    }
    
    #hero p.text-muted {
        font-size: 0.9rem;
    }
}

/* Secciones responsive */
@media (max-width: 575.98px) {
    section {
        padding-top: 2.5rem !important;
        padding-bottom: 2.5rem !important;
    }
    
    section h3 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem !important;
    }
    
    section h4 {
        font-size: 1.1rem;
    }
}

/* Formulario de contacto responsive */
@media (max-width: 991.98px) {
    #contacto .row.g-5 {
        gap: 2rem !important;
    }
}

@media (max-width: 575.98px) {
    #contacto .card {
        border-radius: 0.75rem;
    }
    
    #contacto .form-label {
        font-size: 0.95rem;
        margin-bottom: 0.5rem;
    }
    
    #contacto .form-control,
    #contacto textarea.form-control {
        font-size: 1rem;
        padding: 0.75rem;
        min-height: 44px;
    }
    
    #contacto textarea.form-control {
        min-height: 120px;
    }
    
    #contacto .list-unstyled li {
        font-size: 0.9rem;
        margin-bottom: 0.75rem;
    }
}

/* Footer responsive */
@media (max-width: 767.98px) {
    footer .d-flex {
        flex-direction: column;
        text-align: center;
    }
    
    footer .d-flex.align-items-center.gap-3 {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem !important;
    }
    
    footer .d-flex.align-items-center.gap-3 a,
    footer .d-flex.align-items-center.gap-3 button {
        font-size: 0.9rem;
    }
}

@media (max-width: 575.98px) {
    footer {
        padding-top: 1.5rem !important;
        padding-bottom: 1.5rem !important;
    }
    
    footer .small {
        font-size: 0.85rem;
    }
}

/* Modal responsive */
@media (max-width: 991.98px) {
    .modal-dialog.modal-lg {
        max-width: 95%;
        margin: 1rem auto;
    }
}

@media (max-width: 575.98px) {
    .modal-dialog {
        margin: 0.5rem;
    }
    
    .modal-content {
        border-radius: 0.75rem;
    }
    
    .modal-header {
        padding: 1rem;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .modal-footer {
        padding: 1rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .modal-footer .btn {
        width: 100%;
    }
}

/* Mejoras generales para tablets */
@media (min-width: 768px) and (max-width: 991.98px) {
    .container {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

/* Espaciado mejorado para móviles */
@media (max-width: 575.98px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .row.g-4,
    .row.g-5 {
        --bs-gutter-y: 1.5rem;
        --bs-gutter-x: 1rem;
    }
    
    .row.g-3 {
        --bs-gutter-y: 1rem;
        --bs-gutter-x: 0.75rem;
    }
}

/* Listas responsive */
@media (max-width: 575.98px) {
    .list-unstyled li {
        font-size: 0.95rem;
        line-height: 1.5;
    }
    
    .timeline-content ul li {
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
    }
}

/* Badges y chips responsive */
@media (max-width: 575.98px) {
    .badge {
        font-size: 0.75rem;
        padding: 0.35rem 0.65rem;
    }
    
    #techChips .badge {
        font-size: 0.7rem;
        padding: 0.3rem 0.6rem;
    }
}

/* Texto responsive */
@media (max-width: 575.98px) {
    .text-muted {
        font-size: 0.9rem;
    }
    
    .small {
        font-size: 0.85rem;
    }
}

/* Grid de proyectos responsive (si se habilita) */
@media (max-width: 767.98px) {
    #projects-grid .col-md-6 {
        margin-bottom: 1.5rem;
    }
}

@media (max-width: 575.98px) {
    #projects-grid .card {
        margin-bottom: 1rem;
    }
}

/* Mejoras de accesibilidad táctil */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
    }
    
    .btn:active {
        transform: scale(0.98);
    }
    
    #projects-grid .card:hover {
        transform: none;
    }
    
    #projects-grid .card:active {
        transform: translateY(-2px);
    }
}

/* Ajustes adicionales para pantallas muy pequeñas */
@media (max-width: 374.98px) {
    #hero h1.display-5 {
        font-size: 1.5rem;
    }
    
    #hero h2.h4 {
        font-size: 0.95rem;
    }
    
    .d-flex.flex-wrap.gap-3 .btn {
        min-width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .navbar-brand {
        font-size: 1rem;
    }
}

/* Mejoras para orientación landscape en móviles */
@media (max-width: 991.98px) and (orientation: landscape) {
    #hero {
        padding-top: 1.5rem !important;
        padding-bottom: 1.5rem !important;
    }
    
    section {
        padding-top: 2rem !important;
        padding-bottom: 2rem !important;
    }
}

/* Asegurar que las imágenes siempre sean responsive */
img {
    max-width: 100%;
    height: auto;
}

/* Mejorar el texto en pantallas pequeñas */
@media (max-width: 575.98px) {
    .lead {
        font-size: 1rem;
    }
}

/* Ajustes para mejor legibilidad en móviles */
@media (max-width: 575.98px) {
    body {
        font-size: 0.95rem;
    }
    
    h1, .h1 {
        font-size: 1.75rem;
    }
    
    h2, .h2 {
        font-size: 1.5rem;
    }
    
    h3, .h3 {
        font-size: 1.25rem;
    }
    
    h4, .h4 {
        font-size: 1.1rem;
    }
    
    h5, .h5 {
        font-size: 1rem;
    }
    
    h6, .h6 {
        font-size: 0.95rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition: none !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}