/* =============================================
   THE OPEN SOURCE PROJECT — style.css
   ============================================= */

/* ===== VARIABLES SAKURA ===== */
:root {
    --sakura-pink:        #f8d7e3;
    --sakura-medium-pink: #f7c4d4;
    --sakura-deep-pink:   #e5b7ce;
    --sakura-blossom:     #ffb7c5;
    --sakura-cream:       #fff4e9;
    --sakura-moss:        #b8a99a;
    --sakura-wood:        #c4a599;
    --sakura-text:        #5d4a4a;
    --sakura-white:       #fff9f9;
    --sakura-shadow:      rgba(93, 74, 74, 0.12);

    --bg-main:      var(--sakura-cream);
    --bg-alt:       var(--sakura-pink);
    --text-main:    var(--sakura-text);
    --card-bg:      var(--sakura-white);
    --primary:      var(--sakura-blossom);
    --primary-dark: var(--sakura-deep-pink);
    --accent:       var(--sakura-moss);

    --radius-sm:  16px;
    --radius-md:  24px;
    --radius-lg:  40px;
    --radius-xl:  50px;

    --transition: 0.3s ease;
}

/* ===== RESET Y BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'DM Sans', sans-serif;
    background: url('sakurabg.png') center center / cover no-repeat fixed;
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Accesibilidad: solo mostrar outline al navegar con teclado */
:focus-visible {
    outline: 3px solid var(--sakura-blossom);
    outline-offset: 3px;
    border-radius: 4px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Screen-reader only */
.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;
}

h1, h2, h3, h4 {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 600;
    letter-spacing: 0.02em;
}

img {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
}

ul {
    list-style: none;
}

/* ===== ANIMACIONES ===== */
@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33%       { transform: translate(30px, -30px) rotate(120deg); }
    66%       { transform: translate(-20px, 20px) rotate(240deg); }
}

@keyframes sway {
    0%, 100% { transform: rotate(-5deg); }
    50%       { transform: rotate(5deg); }
}

@keyframes blink {
    0%, 50%   { opacity: 1; }
    51%, 100% { opacity: 0; }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(8px); }
}

@keyframes fadeOut {
    from { opacity: 1; transform: scale(1); }
    to   { opacity: 0; transform: scale(0.98); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes revealUp {
    from { opacity: 0; transform: translateY(32px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===== OVERLAY DE CARGA ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--sakura-cream);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s;
}

.spinner {
    width: 56px;
    height: 56px;
    border: 4px solid var(--sakura-pink);
    border-top-color: var(--sakura-blossom);
    border-radius: 50%;
    animation: spin 0.9s infinite linear;
}

/* ===== PANTALLA DE BIENVENIDA ===== */
.welcome-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: url('sakurabg.png') center center / cover no-repeat;
    overflow: hidden;
}

.welcome-page.fade-out {
    animation: fadeOut 0.5s ease forwards;
}

.floating-elements {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.floating-element {
    position: absolute;
    width: 260px;
    height: 260px;
    background: radial-gradient(circle, var(--sakura-blossom) 0%, transparent 70%);
    opacity: 0.12;
    border-radius: 50%;
    filter: blur(50px);
    animation: float 20s infinite;
}

/* Posiciones via CSS — sin inline style */
.fe-1 { top: 20%;    left: 10%;  animation-delay: 0s; }
.fe-2 { top: 60%;    right: 15%; animation-delay: 2s; }
.fe-3 { bottom: 20%; left: 20%;  animation-delay: 4s; }

.welcome-card {
    text-align: center;
    max-width: 780px;
    padding: 3.5rem;
    background: rgba(255, 249, 249, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-radius: var(--radius-xl);
    box-shadow: 0 30px 60px var(--sakura-shadow);
    border: 2px solid rgba(255, 183, 197, 0.5);
    position: relative;
    z-index: 2;
    margin: 1.5rem;
}

.welcome-icon {
    font-size: 4rem;
    color: var(--sakura-blossom);
    margin-bottom: 1rem;
    animation: sway 3s ease-in-out infinite;
    display: inline-block;
}

#title {
    font-family: 'Cormorant Garamond', serif;
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--sakura-text);
    margin-bottom: 1rem;
    min-height: 1.2em; /* evita salto antes del typewriter */
}

.cursor {
    animation: blink 1s infinite;
    color: var(--sakura-deep-pink);
}

.subtitle {
    font-size: 1.15rem;
    color: var(--sakura-moss);
    margin: 1.5rem 0 2.5rem;
    font-style: italic;
}

.subtitle i {
    color: var(--sakura-blossom);
    margin: 0 0.4rem;
    opacity: 0.8;
}

/* ===== BOTONES ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.9rem 2.2rem;
    border-radius: var(--radius-xl);
    font-family: 'DM Sans', sans-serif;
    font-weight: 500;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    border: 2px solid transparent;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    background: var(--sakura-blossom);
    color: var(--sakura-text);
    box-shadow: 0 4px 14px rgba(255, 183, 197, 0.4);
}

.btn:hover {
    background: var(--sakura-deep-pink);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(255, 183, 197, 0.55);
}

.btn:active {
    transform: translateY(-1px);
}

.btn-large {
    padding: 1.1rem 2.8rem;
    font-size: 1.1rem;
}

.btn-outline {
    background: transparent;
    border-color: var(--sakura-blossom);
    color: var(--sakura-text);
    box-shadow: none;
}

.btn-outline:hover {
    background: var(--sakura-pink);
    box-shadow: none;
}

/* ===== NAVEGACIÓN ===== */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 500;
    background: rgba(255, 249, 249, 0.82);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 183, 197, 0.25);
    transition: box-shadow var(--transition);
}

.site-nav.scrolled {
    box-shadow: 0 4px 20px var(--sakura-shadow);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.85rem 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--sakura-text);
    text-decoration: none;
    letter-spacing: 0.05em;
}

.nav-logo i {
    color: var(--sakura-blossom);
    font-size: 1.2rem;
}

.nav-links {
    display: flex;
    gap: 1.8rem;
    margin-left: auto;
    list-style: none;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--sakura-moss);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
    padding-bottom: 2px;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover {
    color: var(--sakura-text);
    border-bottom-color: var(--sakura-blossom);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1.2rem;
    background: var(--sakura-blossom);
    color: var(--sakura-text);
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: background var(--transition), transform var(--transition);
    white-space: nowrap;
}

.nav-cta:hover {
    background: var(--sakura-deep-pink);
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.3rem;
    color: var(--sakura-text);
    cursor: pointer;
    padding: 0.3rem;
    margin-left: auto;
}

/* Menú móvil */
.mobile-menu {
    background: var(--sakura-white);
    border-top: 1px solid rgba(255, 183, 197, 0.25);
    padding: 1rem 2rem 1.5rem;
}

.mobile-menu ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.mobile-menu a {
    display: block;
    padding: 0.6rem 0;
    color: var(--sakura-text);
    text-decoration: none;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 183, 197, 0.2);
    transition: color var(--transition);
}

.mobile-menu a:hover {
    color: var(--sakura-blossom);
}

/* ===== CARD SECTIONS (estructura principal) ===== */
.card-section {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    margin: 2rem auto;
    max-width: 1200px;
    box-shadow: 0 12px 32px var(--sakura-shadow);
    overflow: hidden;
    position: relative;

    /* scroll-reveal: estado inicial */
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.card-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.card-section-alt {
    background: linear-gradient(135deg, var(--sakura-pink) 0%, var(--sakura-cream) 100%);
}

.card-content {
    padding: 3rem;
}

/* partículas decorativas del header */
.card-header-particles {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, var(--sakura-blossom) 0%, transparent 35%),
        radial-gradient(circle at 80% 70%, var(--sakura-moss) 0%, transparent 35%);
    opacity: 0.08;
    filter: blur(40px);
    pointer-events: none;
}

/* ===== HEADER ===== */
.header-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.card-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    text-align: center;
    margin-bottom: 1.2rem;
    color: var(--sakura-text);
}

.card-title i {
    color: var(--sakura-blossom);
    margin: 0 0.4rem;
}

.card-subtitle {
    text-align: center;
    color: var(--sakura-moss);
    font-style: italic;
    margin-bottom: 2rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

.stats-container {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-family: 'Cormorant Garamond', serif;
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--sakura-deep-pink);
}

.stat-label {
    display: block;
    color: var(--sakura-moss);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 0.2rem;
}

.header-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2.5rem;
}

/* ===== CONTENT GRID (¿qué ofrecemos?) ===== */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.content-text p {
    font-size: 1.05rem;
    margin-bottom: 1.4rem;
    color: var(--sakura-text);
}

.benefits-list {
    list-style: none;
    margin-top: 1.5rem;
}

.benefits-list li {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin: 0.9rem 0;
    font-size: 1rem;
}

.benefits-list i {
    color: var(--sakura-blossom);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.content-image {
    text-align: center;
}

.card-img {
    width: 100%;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 24px var(--sakura-shadow);
    transition: transform var(--transition);
}

.card-img:hover {
    transform: scale(1.02);
}

.image-caption {
    margin-top: 0.6rem;
    color: var(--sakura-moss);
    font-style: italic;
    font-size: 0.9rem;
}

/* ===== FILOSOFÍA CARDS ===== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.8rem;
    margin-top: 2rem;
}

.mini-card {
    background: var(--sakura-white);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    border: 2px solid rgba(255, 183, 197, 0.2);
    box-shadow: 0 4px 14px var(--sakura-shadow);
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.mini-card:hover {
    transform: translateY(-6px);
    border-color: var(--sakura-blossom);
    box-shadow: 0 12px 28px var(--sakura-shadow);
}

.mini-card-icon {
    width: 68px;
    height: 68px;
    background: var(--sakura-pink);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.2rem;
    font-size: 1.8rem;
    color: var(--sakura-blossom);
}

.mini-card h3 {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.3rem;
    margin-bottom: 0.6rem;
    color: var(--sakura-text);
}

.mini-card p {
    font-size: 0.95rem;
    color: var(--sakura-moss);
}

/* ===== ACORDEÓN (objetivos) ===== */
.objectives-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.accordion-card {
    background: var(--sakura-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid rgba(255, 183, 197, 0.3);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.accordion-card:hover {
    border-color: var(--sakura-blossom);
    box-shadow: 0 8px 20px var(--sakura-shadow);
}

/* El botón es el header completo */
.accordion-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.4rem 1.6rem;
    background: var(--sakura-pink);
    width: 100%;
    border: none;
    cursor: pointer;
    font-family: 'Cormorant Garamond', serif;
    color: var(--sakura-text);
    text-align: left;
    transition: background var(--transition);
}

.accordion-header:hover {
    background: var(--sakura-medium-pink);
}

.accordion-header i:first-child {
    font-size: 1.4rem;
    color: var(--sakura-blossom);
    flex-shrink: 0;
}

.accordion-header h3 {
    flex: 1;
    margin: 0;
    font-size: 1.2rem;
}

.toggle-icon {
    transition: transform 0.3s ease;
    flex-shrink: 0;
    color: var(--sakura-moss);
}

/* Rotación gestionada por CSS, no JS */
.accordion-card.active .toggle-icon {
    transform: rotate(180deg);
}

.accordion-content {
    padding: 0 1.6rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}

/* Cuando el contenido está visible (hidden se quita via JS) */
.accordion-card.active .accordion-content {
    max-height: 600px;
    padding: 1.4rem 1.6rem;
}

/* Compatibilidad: cuando usamos hidden en el HTML necesitamos anular el display:none en estado activo */
.accordion-card.active .accordion-content[hidden] {
    display: block;
}

.progress-bar {
    background: var(--sakura-pink);
    border-radius: 10px;
    height: 28px;
    position: relative;
    margin-top: 1.2rem;
    overflow: hidden;
}

.progress-fill {
    background: linear-gradient(90deg, var(--sakura-blossom), var(--sakura-deep-pink));
    height: 100%;
    border-radius: 10px;
    transition: width 0.5s ease;
}

.progress-bar span {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--sakura-text);
}

.objective-list {
    list-style: none;
    margin-top: 1rem;
}

.objective-list li {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin: 0.6rem 0;
    font-size: 0.95rem;
}

.objective-list i {
    color: var(--sakura-blossom);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* ===== TECNOLOGÍAS ===== */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 1.8rem;
    margin-top: 2rem;
}

.tech-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 1.8rem;
    border: 2px solid rgba(255, 183, 197, 0.25);
    box-shadow: 0 6px 18px var(--sakura-shadow);
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.tech-card:hover {
    transform: translateY(-8px);
    border-color: var(--sakura-blossom);
    box-shadow: 0 18px 36px var(--sakura-shadow);
}

.tech-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.tech-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
    flex-shrink: 0;
}

/* Reemplazo elegante para logos faltantes */
.tech-logo-placeholder {
    width: 48px;
    height: 48px;
    background: var(--sakura-pink);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Cormorant Garamond', serif;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--sakura-deep-pink);
    letter-spacing: 0.02em;
    flex-shrink: 0;
}

.tech-logo-placeholder i {
    font-size: 1.4rem;
    color: var(--sakura-blossom);
}

.tech-header h3 {
    font-size: 1.35rem;
    color: var(--sakura-text);
}

.tech-card p {
    font-size: 0.95rem;
    color: var(--sakura-moss);
    flex: 1;
    line-height: 1.7;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tech-tags span {
    background: var(--sakura-pink);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.78rem;
    color: var(--sakura-text);
}

.tech-link,
.tech-links-row {
    margin-top: auto;
}

.tech-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--sakura-deep-pink);
    text-decoration: none;
    transition: color var(--transition), gap var(--transition);
}

.tech-link:hover {
    color: var(--sakura-text);
    gap: 0.6rem;
}

.tech-links-row {
    display: flex;
    gap: 1.2rem;
}

/* ===== NEWSLETTER ===== */
.newsletter-card {
    background: linear-gradient(145deg, var(--sakura-pink) 0%, var(--sakura-cream) 100%);
}

.newsletter-content {
    text-align: center;
}

.newsletter-form {
    max-width: 520px;
    margin: 2rem auto 0;
}

.form-group {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    justify-content: center;
}

.form-group input[type="email"] {
    flex: 1;
    min-width: 240px;
    padding: 0.9rem 1.5rem;
    border: 2px solid var(--sakura-blossom);
    border-radius: var(--radius-xl);
    background: var(--sakura-white);
    font-family: 'DM Sans', sans-serif;
    font-size: 1rem;
    color: var(--sakura-text);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input[type="email"]::placeholder {
    color: var(--sakura-moss);
}

.form-group input[type="email"]:focus {
    border-color: var(--sakura-deep-pink);
    box-shadow: 0 0 0 3px rgba(255, 183, 197, 0.25);
}

.checkbox-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--sakura-moss);
    cursor: pointer;
}

.inline-link {
    color: var(--sakura-deep-pink);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.newsletter-msg {
    margin-top: 0.8rem;
    font-size: 0.9rem;
    min-height: 1.4em;
    font-weight: 500;
}

.newsletter-msg.success { color: #6a9a5b; }
.newsletter-msg.error   { color: #c0605a; }

/* ===== REDES SOCIALES ===== */
.social-content {
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.75rem 1.8rem;
    background: var(--sakura-white);
    border-radius: var(--radius-xl);
    color: var(--sakura-text);
    text-decoration: none;
    font-weight: 500;
    border: 2px solid var(--sakura-blossom);
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.social-link:hover {
    background: var(--sakura-blossom);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px var(--sakura-shadow);
}

.social-link i {
    font-size: 1.4rem;
}

.social-link-small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(255, 183, 197, 0.2);
    border-radius: 50%;
    color: var(--sakura-cream);
    text-decoration: none;
    font-size: 1rem;
    margin-top: 0.8rem;
    transition: background var(--transition);
}

.social-link-small:hover {
    background: rgba(255, 183, 197, 0.4);
}

.mastodon-note {
    color: var(--sakura-moss);
    font-size: 0.9rem;
    font-style: italic;
}

/* ===== FOOTER ===== */
footer.card-section {
    background: linear-gradient(145deg, var(--sakura-wood), var(--sakura-moss));
    color: var(--sakura-white);
}

.footer-content {
    padding-bottom: 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--sakura-white);
}

.footer-section p {
    color: var(--sakura-cream);
    font-size: 0.92rem;
}

.footer-section ul li {
    margin: 0.5rem 0;
}

.footer-section a {
    color: var(--sakura-cream);
    text-decoration: none;
    font-size: 0.92rem;
    transition: color var(--transition);
}

.footer-section a:hover {
    color: var(--sakura-blossom);
}

.footer-bottom {
    text-align: center;
    padding: 1.8rem 3rem;
    margin-top: 2rem;
    border-top: 1px solid rgba(255, 249, 249, 0.18);
    font-size: 0.88rem;
    color: rgba(255, 249, 249, 0.7);
}

.footer-bottom a {
    color: var(--sakura-blossom);
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

.heart {
    margin-top: 0.4rem;
}

.heart i.fa-heart {
    color: #ff6b6b;
}

.heart i.fa-spa {
    color: var(--sakura-blossom);
}

/* ===== BOTÓN VOLVER ARRIBA ===== */
.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 48px;
    height: 48px;
    background: var(--sakura-blossom);
    color: var(--sakura-text);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    z-index: 600;

    /* Usa hidden attribute — se controla con opacity para animación suave */
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s, transform 0.3s, background var(--transition);
}

/* Cuando hidden se quita, queremos mostrar con animación — lo manejamos via clase */
.back-to-top:not([hidden]) {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--sakura-deep-pink);
    transform: translateY(-3px);
}

/* ===== CONTENIDO PRINCIPAL fade-in ===== */
#contenido.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
    .nav-links,
    .nav-cta {
        display: none;
    }

    .nav-toggle {
        display: block;
    }
}

@media (max-width: 768px) {
    .card-content {
        padding: 2rem 1.5rem;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .header-actions {
        flex-direction: column;
        align-items: center;
    }

    .stats-container {
        gap: 1.5rem;
    }

    .objectives-grid {
        grid-template-columns: 1fr;
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .welcome-card {
        padding: 2.2rem 1.8rem;
        border-radius: var(--radius-lg);
    }

    .form-group {
        flex-direction: column;
        align-items: stretch;
    }

    .form-group input[type="email"] {
        min-width: unset;
    }
}

@media (max-width: 480px) {
    .card-section {
        margin: 1rem 0.8rem;
        border-radius: var(--radius-md);
    }

    .card-title {
        font-size: 1.7rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .back-to-top {
        bottom: 18px;
        right: 18px;
        width: 42px;
        height: 42px;
    }
}