/* ============================================
   CSS RESET & BASE STYLES
   ============================================ */

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

:root {
    /* Brand Colors */
    --color-primary: #223D3B;
    --color-primary-light: #5A7872;
    --color-accent: #FF7A5B;
    --color-cream: #FFF5E7;
    --color-text: #7A7A7A;
    --color-white: #FFFFFF;
    --color-black: #000000;

    /* Typography */
    --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    --spacing-xxxl: 6rem;

    /* Layout */
    --container-max-width: 1200px;
    --header-height: 64px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
}

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

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-regular);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: var(--color-white);
    padding: var(--spacing-sm);
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   HEADER
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--color-white);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.header__logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    padding: 12px 0;
}

.header__logo-img {
    height: 28px;
    width: auto;
    display: block;
}

.header__nav {
    display: none;
}

@media (min-width: 768px) {
    .header__nav {
        display: block;
    }
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav__link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-fast);
}

.nav__link:hover,
.nav__link:focus {
    color: var(--color-accent);
}

.nav__link:hover::after,
.nav__link:focus::after {
    width: 100%;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    padding: calc(var(--header-height) + var(--spacing-xxl)) 0 var(--spacing-xxxl);
    background: linear-gradient(135deg, var(--color-primary) 0%, #1a2e2c 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(255, 122, 91, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero__badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    color: var(--color-white);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    backdrop-filter: blur(10px);
}

.hero__title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
    font-weight: var(--font-weight-light);
}

.hero .btn--primary {
    background: var(--color-accent);
    color: var(--color-white);
    font-size: 1rem;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    border-radius: 8px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
}

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

.btn--primary:hover,
.btn--primary:focus {
    background: #ff6347;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn--secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn--secondary:hover,
.btn--secondary:focus {
    background: var(--color-primary);
    color: var(--color-white);
}

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

/* ============================================
   INTRO SECTION
   ============================================ */

.intro {
    padding: var(--spacing-xl) 0 var(--spacing-xxxl);
    background: var(--color-cream);
}

.intro__content {
    max-width: 900px;
    margin: 0 auto;
}

.intro__text p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.intro__text p:last-child {
    margin-bottom: var(--spacing-xl);
}

.intro__stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.stat__number {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat__label {
    font-size: 1rem;
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

/* ============================================
   PRINCIPIOS SECTION
   ============================================ */

.principios {
    padding: var(--spacing-xxxl) 0;
    background: var(--color-white);
}

.section__title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.principios__layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 1024px) {
    .principios__layout {
        grid-template-columns: 280px 1fr;
        gap: var(--spacing-xxl);
    }
}

/* Side Navigation */
.principios__nav {
    display: none;
}

@media (min-width: 1024px) {
    .principios__nav {
        display: block;
        position: sticky;
        top: calc(var(--header-height) + var(--spacing-lg));
        align-self: flex-start;
        max-height: calc(100vh - var(--header-height) - var(--spacing-xl));
        overflow-y: auto;
    }
}

/* Mobile horizontal nav */
@media (max-width: 1023px) {
    .principios__nav {
        display: block;
        overflow-x: auto;
        margin-bottom: var(--spacing-lg);
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .principios__nav::-webkit-scrollbar {
        display: none;
    }

    .principios__nav-list {
        display: flex;
        flex-direction: row;
        gap: var(--spacing-sm);
        padding-bottom: var(--spacing-sm);
    }

    .principios__nav-item {
        flex-shrink: 0;
    }

    .principios__nav-link {
        white-space: nowrap;
        padding: var(--spacing-xs) var(--spacing-sm);
        border-radius: 20px;
    }

    .principios__nav-text {
        display: none;
    }
}

.principios__nav-list {
    list-style: none;
}

.principios__nav-item {
    margin-bottom: var(--spacing-xs);
}

.principios__nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text);
    border-left: 3px solid transparent;
    transition: all var(--transition-fast);
}

@media (max-width: 1023px) {
    .principios__nav-link {
        border-left: none;
        border: 2px solid var(--color-cream);
    }
}

.principios__nav-link:hover,
.principios__nav-link:focus {
    background: var(--color-cream);
    color: var(--color-primary);
}

.principios__nav-link.active {
    border-left-color: var(--color-accent);
    background: var(--color-cream);
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

@media (max-width: 1023px) {
    .principios__nav-link.active {
        border: 2px solid var(--color-accent);
        background: var(--color-accent);
        color: var(--color-white);
    }
}

.principios__nav-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--color-primary-light);
    color: var(--color-white);
    border-radius: 50%;
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    flex-shrink: 0;
}

.principios__nav-link.active .principios__nav-number {
    background: var(--color-accent);
}

.principios__nav-text {
    font-size: 0.9rem;
    line-height: 1.3;
}

/* Principios Content */
.principios__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.principio {
    background: var(--color-white);
    border: 1px solid #e5e5e5;
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.principio:hover {
    box-shadow: var(--shadow-md);
}

.principio.active {
    border-left: 4px solid var(--color-accent);
}

.principio__header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background var(--transition-fast);
}

.principio__header:hover {
    background: var(--color-cream);
}

.principio__header:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: -3px;
}

.principio__header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
}

.principio__number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-accent);
    color: var(--color-white);
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    flex-shrink: 0;
}

.principio__title {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    line-height: 1.3;
}

.principio__icon {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
}

.principio__icon::before,
.principio__icon::after {
    content: '';
    position: absolute;
    background: var(--color-primary);
    transition: transform var(--transition-fast);
}

.principio__icon::before {
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    transform: translateY(-50%);
}

.principio__icon::after {
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    transform: translateX(-50%);
}

.principio__header[aria-expanded="true"] .principio__icon::after {
    transform: translateX(-50%) rotate(90deg);
    opacity: 0;
}

.principio__summary {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-text);
    font-size: 1rem;
}

.principio__body {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.principio__header[aria-expanded="true"] + .principio__summary + .principio__body {
    max-height: 5000px;
}

.principio__description,
.principio__bases,
.principio__mexico {
    padding: 0 var(--spacing-md) var(--spacing-md);
}

.principio__description p {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.principio__subtitle {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.principio__badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.source-badge {
    display: inline-block;
    padding: 6px var(--spacing-sm);
    background: var(--color-cream);
    border: 1px solid var(--color-accent);
    border-radius: 16px;
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
}

.principio__mexico ul {
    list-style: none;
    margin-top: var(--spacing-sm);
}

.principio__mexico li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.principio__mexico li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: var(--font-weight-bold);
}

/* ============================================
   CONCLUSION SECTION
   ============================================ */

.conclusion {
    padding: var(--spacing-xxxl) 0;
    background: var(--color-primary);
    color: var(--color-white);
}

.conclusion__content {
    max-width: 900px;
    margin: 0 auto;
}

.conclusion__content p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

/* ============================================
   CTA SECTION
   ============================================ */

.cta {
    padding: var(--spacing-xxxl) 0;
    background: var(--color-cream);
}

.cta__content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.cta__title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.cta__text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
}

.cta__buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ============================================
   REFERENCIAS SECTION
   ============================================ */

.referencias {
    padding: var(--spacing-xxxl) 0;
    background: var(--color-white);
}

.referencias__list {
    max-width: 900px;
    margin: 0 auto;
    padding-left: var(--spacing-lg);
}

.referencias__item {
    font-size: 0.9375rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.referencias__item a {
    color: var(--color-accent);
    text-decoration: none;
    word-break: break-all;
    transition: color var(--transition-fast);
}

.referencias__item a:hover,
.referencias__item a:focus {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    background: #1a2e2c;
    color: rgba(255, 255, 255, 0.8);
}

.footer__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

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

.footer__logo {
    height: 40px;
    width: auto;
    filter: brightness(0) invert(1);
    margin-bottom: var(--spacing-sm);
}

.footer__tagline {
    font-size: 0.9375rem;
    line-height: 1.6;
}

.footer__links {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

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

.footer__heading {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.footer__contact a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__contact a:hover,
.footer__contact a:focus {
    color: var(--color-white);
}

.footer__social {
    display: flex;
    gap: var(--spacing-md);
}

.footer__social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--color-white);
    transition: all var(--transition-fast);
}

.footer__social a:hover,
.footer__social a:focus {
    background: var(--color-accent);
    transform: translateY(-2px);
}

.footer__bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer__copyright {
    font-size: 0.875rem;
}

/* ============================================
   BACK TO TOP BUTTON
   ============================================ */

.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    background: var(--color-accent);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus {
    background: var(--color-primary);
    transform: translateY(-4px);
}

.back-to-top:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Intersection Observer classes */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   MOBILE OPTIMIZATIONS
   ============================================ */

/* Small mobile devices (375px and below) */
@media (max-width: 480px) {
    :root {
        --spacing-xxxl: 3rem;
        --spacing-xxl: 2.5rem;
        --spacing-xl: 2rem;
    }

    .container {
        padding: 0 1rem;
    }

    /* Header - more compact */
    .header__logo-img {
        height: 24px;
    }

    /* Hero - tighter on mobile */
    .hero {
        padding: calc(var(--header-height) + 2rem) 0 2.5rem;
    }

    .hero__title {
        font-size: 1.625rem;
        line-height: 1.25;
        margin-bottom: 1rem;
    }

    .hero__subtitle {
        font-size: 0.9375rem;
        line-height: 1.5;
        margin-bottom: 1.5rem;
    }

    .hero .btn {
        width: 100%;
        padding: 0.875rem 1.5rem;
    }

    /* Intro - tighter text */
    .intro {
        padding: 2rem 0 2.5rem;
    }

    .intro__text p {
        font-size: 0.9375rem;
        line-height: 1.65;
        margin-bottom: 1rem;
    }

    .intro__text p:last-child {
        margin-bottom: 1.5rem;
    }

    /* Section title */
    .section__title {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

    /* Principios section */
    .principios {
        padding: 2.5rem 0;
    }

    /* Mobile nav - better touch targets */
    .principios__nav-link {
        padding: 0.375rem 0.625rem;
        font-size: 0.875rem;
    }

    .principios__nav-number {
        width: 24px;
        height: 24px;
        font-size: 0.75rem;
    }

    /* Principio cards - compact */
    .principio {
        border-radius: 8px;
    }

    .principio__header {
        padding: 0.875rem 1rem;
    }

    .principio__header-left {
        gap: 0.75rem;
    }

    .principio__number {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    .principio__title {
        font-size: 0.9375rem;
        line-height: 1.3;
    }

    .principio__icon {
        width: 20px;
        height: 20px;
    }

    .principio__summary {
        padding: 0 1rem 0.75rem;
        font-size: 0.875rem;
    }

    .principio__summary p {
        font-size: 0.875rem;
        line-height: 1.5;
    }

    .principio__description,
    .principio__bases,
    .principio__mexico {
        padding: 0 1rem 1rem;
    }

    .principio__description p {
        font-size: 0.875rem;
        line-height: 1.65;
        margin-bottom: 0.875rem;
    }

    .principio__subtitle {
        font-size: 0.9375rem;
        margin-bottom: 0.5rem;
    }

    .principio__mexico li {
        font-size: 0.875rem;
        line-height: 1.5;
        padding-left: 1.25rem;
        margin-bottom: 0.5rem;
    }

    /* Conclusion - tighter */
    .conclusion {
        padding: 2.5rem 0;
    }

    .conclusion__content p {
        font-size: 0.9375rem;
        line-height: 1.65;
        margin-bottom: 1rem;
    }

    /* CTA - stacked buttons */
    .cta {
        padding: 2.5rem 0;
    }

    .cta__title {
        font-size: 1.375rem;
        margin-bottom: 1rem;
    }

    .cta__text {
        font-size: 0.9375rem;
        line-height: 1.6;
        margin-bottom: 1.5rem;
    }

    .cta__buttons {
        flex-direction: column;
        gap: 0.75rem;
    }

    .cta__buttons .btn {
        width: 100%;
        padding: 0.875rem 1.5rem;
    }

    /* Referencias */
    .referencias {
        padding: 2.5rem 0;
    }

    .referencias__list {
        padding-left: 1.25rem;
    }

    .referencias__item {
        font-size: 0.8125rem;
        line-height: 1.6;
        margin-bottom: 1rem;
    }

    .referencias__item a {
        word-break: break-all;
        font-size: 0.8125rem;
    }

    /* Footer */
    .footer {
        padding: 2rem 0 1.5rem;
    }

    .footer__content {
        gap: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .footer__logo {
        height: 32px;
    }

    .footer__tagline {
        font-size: 0.8125rem;
    }

    .footer__heading {
        font-size: 1rem;
    }

    .footer__social a {
        width: 36px;
        height: 36px;
    }

    .footer__social a svg {
        width: 18px;
        height: 18px;
    }

    .footer__copyright {
        font-size: 0.75rem;
    }

    /* Back to top - smaller on mobile */
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 1rem;
        right: 1rem;
    }

    .back-to-top svg {
        width: 20px;
        height: 20px;
    }
}

/* Medium mobile / small tablet (481px - 767px) */
@media (min-width: 481px) and (max-width: 767px) {
    :root {
        --spacing-xxxl: 4rem;
        --spacing-xxl: 3rem;
    }

    /* Hero */
    .hero {
        padding: calc(var(--header-height) + 2.5rem) 0 3rem;
    }

    .hero__title {
        font-size: 2rem;
    }

    .hero__subtitle {
        font-size: 1rem;
        line-height: 1.6;
    }

    /* Intro */
    .intro {
        padding: 2.5rem 0 3rem;
    }

    .intro__text p {
        font-size: 1rem;
        line-height: 1.7;
    }

    /* Section title */
    .section__title {
        font-size: 1.75rem;
    }

    /* Principio cards */
    .principio__header {
        padding: 1rem 1.25rem;
    }

    .principio__number {
        width: 36px;
        height: 36px;
        font-size: 1.125rem;
    }

    .principio__title {
        font-size: 1.0625rem;
    }

    .principio__description p {
        font-size: 0.9375rem;
        line-height: 1.7;
    }

    .principio__mexico li {
        font-size: 0.9375rem;
    }

    /* CTA buttons - stacked */
    .cta__buttons {
        flex-direction: column;
        align-items: center;
    }

    .cta__buttons .btn {
        width: 100%;
        max-width: 320px;
    }

    /* Conclusion */
    .conclusion__content p {
        font-size: 1rem;
        line-height: 1.7;
    }

    /* Referencias */
    .referencias__item {
        font-size: 0.875rem;
    }
}

/* Tablet (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
    /* Hero refinements */
    .hero {
        padding: calc(var(--header-height) + 3rem) 0 3.5rem;
    }

    /* Principios - reduce section padding */
    .principios {
        padding: 4rem 0;
    }

    /* CTA buttons side by side on tablet */
    .cta__buttons .btn {
        min-width: 200px;
    }

    /* Conclusion */
    .conclusion {
        padding: 4rem 0;
    }

    .cta {
        padding: 4rem 0;
    }

    .referencias {
        padding: 4rem 0;
    }
}

/* Touch device improvements */
@media (hover: none) and (pointer: coarse) {
    .principio__header {
        min-height: 48px;
    }

    .btn {
        min-height: 48px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .principios__nav-link {
        min-height: 40px;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .header,
    .hero,
    .cta,
    .footer,
    .back-to-top {
        display: none;
    }

    .principio__body {
        max-height: none !important;
    }

    a {
        text-decoration: underline;
    }

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }
}

/* ============================================
   MODAL DESCARGA GUÍA
   ============================================ */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(34, 61, 59, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-sm);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal-overlay:not([hidden]) {
    opacity: 1;
}

.modal-overlay[hidden] {
    display: none;
}

.modal {
    background: var(--color-white);
    border-radius: 16px;
    padding: var(--spacing-xl) var(--spacing-lg);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 24px 48px rgba(34, 61, 59, 0.25);
    transform: translateY(16px);
    transition: transform var(--transition-normal);
}

.modal-overlay:not([hidden]) .modal {
    transform: translateY(0);
}

.modal__close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    padding: 0.375rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.modal__close:hover {
    color: var(--color-primary);
    background: var(--color-cream);
}

.modal__icon {
    width: 64px;
    height: 64px;
    background: var(--color-cream);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: var(--color-primary);
}

.modal__icon--success {
    background: #e6f4f1;
    color: #2e7d6e;
}

.modal__title {
    font-size: 1.375rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 0.375rem;
    line-height: 1.3;
}

.modal__subtitle {
    font-size: 0.9375rem;
    color: var(--color-text);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.modal__form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Honeypot — invisible para humanos */
.modal__field--honeypot {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    tab-index: -1;
}

.modal__field {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.modal__label {
    font-size: 0.9rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
}

.modal__label span {
    color: var(--color-accent);
}

.modal__input,
.modal__select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-family: var(--font-family);
    font-size: 0.9375rem;
    color: var(--color-primary);
    background: var(--color-white);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    -webkit-appearance: none;
    appearance: none;
}

.modal__select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%235A7872' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' viewBox='0 0 24 24'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.875rem center;
    padding-right: 2.5rem;
    cursor: pointer;
}

.modal__input:focus,
.modal__select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(34, 61, 59, 0.12);
}

.modal__input.is-invalid,
.modal__select.is-invalid {
    border-color: #d32f2f;
}

.modal__input.is-valid,
.modal__select.is-valid {
    border-color: #2e7d6e;
}

.modal__error {
    font-size: 0.8125rem;
    color: #d32f2f;
    min-height: 1.25rem;
    display: block;
}

/* Checkboxes personalizados */
.modal__checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.9375rem;
    color: var(--color-primary);
    line-height: 1.45;
    user-select: none;
}

.modal__checkbox-label--small {
    font-size: 0.875rem;
    color: var(--color-text);
}

.modal__checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.modal__checkbox-custom {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border: 2px solid #c0c0c0;
    border-radius: 4px;
    background: var(--color-white);
    margin-top: 1px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.modal__checkbox:checked + .modal__checkbox-custom {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.modal__checkbox:checked + .modal__checkbox-custom::after {
    content: '';
    width: 5px;
    height: 9px;
    border: 2px solid var(--color-white);
    border-top: none;
    border-left: none;
    transform: rotate(45deg) translateY(-1px);
    display: block;
}

.modal__checkbox:focus-visible + .modal__checkbox-custom {
    box-shadow: 0 0 0 3px rgba(34, 61, 59, 0.2);
}

.modal__checkbox-label.is-invalid .modal__checkbox-custom {
    border-color: #d32f2f;
}

.modal__link {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: color var(--transition-fast);
}

.modal__link:hover {
    color: var(--color-primary);
}

.modal__submit {
    width: 100%;
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.modal__submit-loading svg {
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Estado éxito */
#modalStepSuccess {
    text-align: center;
}

#modalStepSuccess .btn {
    margin-top: var(--spacing-md);
}

/* Responsive */
@media (max-width: 520px) {
    .modal {
        padding: var(--spacing-lg) var(--spacing-sm);
        border-radius: 12px;
        max-height: 95vh;
    }

    .modal__title {
        font-size: 1.2rem;
    }
}