/* =========================
   VARIABLES & BASE
   ========================= */
:root{
    /* Monochrome Scale */
    --clr-bg-100:#f5f5f5;
    --clr-bg-200:#e8e8e8;
    --clr-bg-300:#d1d1d1;
    --clr-bg-glass:#ffffff33;
    --clr-text-900:#111111;
    --clr-text-700:#333333;
    --clr-text-500:#555555;
    --clr-accent:#4FC3F7;          /* ligero acento azul frío */
    --clr-accent-dark:#2a8bb4;

    /* Effects */
    --radius-card:18px;
    --blur-glass:15px;
    --transition-base:all .35s ease;
}

/* Reset rápido */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{
    font-family:'Work Sans',sans-serif;
    background:var(--clr-bg-100);
    color:var(--clr-text-700);
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{
    font-family:'Poppins',sans-serif;
    color:var(--clr-text-900);
    margin-bottom:.75rem;
    text-align:center;
}
p{margin-bottom:1rem;}
img{max-width:100%;display:block;}
a{text-decoration:none;color:var(--clr-accent);transition:var(--transition-base);}
a:hover,a:focus{color:var(--clr-accent-dark);}

/* =========================
   LAYOUT HELPERS
   ========================= */
.container{
    width:90%;
    max-width:1200px;
    margin-inline:auto;
}
.site-wrapper{overflow:hidden;}
.section-title{margin-bottom:2rem;text-shadow:1px 1px 3px rgba(0,0,0,.15);}
.section-description{max-width:800px;margin:0 auto 2.5rem auto;text-align:center;}

/* =========================
   GLASSMORPHISM BLOCK
   ========================= */
.glass{
    background:var(--clr-bg-glass);
    backdrop-filter:blur(var(--blur-glass));
    -webkit-backdrop-filter:blur(var(--blur-glass));
    border:1px solid rgba(255,255,255,.25);
    border-radius:var(--radius-card);
}
.blur{box-shadow:0 8px 32px rgba(0,0,0,.12);}

/* =========================
   PARALLAX & BACKGROUND
   ========================= */
.parallax-bg{
    position:relative;
    background-size:cover;
    background-repeat:no-repeat;
    background-attachment:fixed;
    background-position:center;
    isolation:isolate;
}
.parallax-bg::after{
    content:'';
    position:absolute;
    inset:0;
    background:rgba(0,0,0,.4); /* overlay siempre oscuro para contraste */
    z-index:-1;
}

/* =========================
   HEADER & NAV
   ========================= */
.site-header{
    position:sticky;
    top:0;
    width:100%;
    z-index:999;
    backdrop-filter:blur(16px);
}
.header-container{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:.75rem 0;
}
.logo{font-family:'Poppins',sans-serif;font-size:1.5rem;font-weight:700;color:#fff;}
.navigation ul{
    display:flex;
    gap:1.5rem;
    list-style:none;
}
.navigation a{color:#fff;text-shadow:0 0 3px rgba(0,0,0,.6);}
.nav-toggle{
    display:none;
    flex-direction:column;
    gap:5px;
    background:none;
    border:none;
    cursor:pointer;
}
.nav-toggle span{
    width:24px;
    height:3px;
    background:#fff;
    transition:var(--transition-base);
}

/* Mobile Nav */
@media(max-width:820px){
    .navigation ul{position:fixed;inset:0 0 0 auto;width:280px;padding:120px 2rem;flex-direction:column;background:rgba(0,0,0,.9);transform:translateX(100%);transition:var(--transition-base);}
    .navigation ul.open{transform:translateX(0);}
    .nav-toggle{display:flex;}
}

/* =========================
   HERO
   ========================= */
.hero-section{
    padding:160px 0 120px 0;
    text-align:center;
    color:#fff;
}
.hero-title{font-size:clamp(2.2rem,5vw,3.5rem);margin-bottom:1rem;}
.hero-subtitle{font-size:1.125rem;max-width:680px;margin:0 auto 2rem auto;color:#e0e0e0;}
.primary-btn{background:var(--clr-accent);}

/* =========================
   BUTTONS  (GLOBAL)
   ========================= */
.btn,button,input[type='submit']{
    display:inline-block;
    padding:.85rem 2.2rem;
    font-size:1rem;
    font-family:'Poppins',sans-serif;
    font-weight:600;
    border:none;
    border-radius:50px;
    cursor:pointer;
    background:var(--clr-text-900);
    color:#fff;
    transition:var(--transition-base);
}
.btn:hover,button:hover,input[type='submit']:hover{
    transform:translateY(-3px);
    background:var(--clr-accent-dark);
}

/* =========================
   CARDS (UNIVERSAL)
   ========================= */
.card,.testimonial-card,.resource-card,.stat-card{
    display:flex;
    flex-direction:column;
    align-items:center;
    text-align:center;
    background:var(--clr-bg-glass);
    border-radius:var(--radius-card);
    padding:1.5rem;
    backdrop-filter:blur(var(--blur-glass));
    transition:var(--transition-base);
}
.card:hover{transform:translateY(-5px);}
.card-image{
    display:flex;
    justify-content:center;
    align-items:center;
    width:100%;
    height:260px;
    overflow:hidden;
    border-radius:var(--radius-card);
    margin-bottom:1rem;
}
.card-image img{
    width:100%;
    height:100%;
    object-fit:cover;
    margin:0 auto;
}

/* =========================
   STATISTICS
   ========================= */
.stats-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
    gap:1.5rem;
    margin-top:2rem;
}
.stat-value{font-size:2rem;font-weight:700;color:var(--clr-text-900);}
.stat-label{color:var(--clr-text-500);}

/* =========================
   SLIDERS (Instructors)
   ========================= */
.instructors-slider{
    display:grid;
    grid-auto-flow:column;
    gap:2rem;
    overflow-x:auto;
    scroll-snap-type:x mandatory;
    padding-bottom:1rem;
}
.instructors-slider .card{scroll-snap-align:center;min-width:280px;}

/* =========================
   TESTIMONIALS
   ========================= */
.testimonial-cards{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
    gap:2rem;
}

/* =========================
   CLIENT LOGOS
   ========================= */
.client-logos{
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    gap:2rem;
    margin-top:2rem;
}
.client-logos span{
    font-weight:600;
    color:var(--clr-text-900);
    background:var(--clr-bg-200);
    padding:.65rem 1.25rem;
    border-radius:var(--radius-card);
}

/* =========================
   NEWS
   ========================= */
.news-cards{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
    gap:2rem;
}

/* =========================
   RESEARCH
   ========================= */
.research-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
    gap:2rem;
}

/* =========================
   RESOURCES
   ========================= */
.resources-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:1.5rem;
}
.resource-card h3{
    font-size:1rem;
    margin-bottom:.5rem;
}
.resource-card p{font-size:.875rem;color:var(--clr-text-500);}

/* =========================
   CONTACT FORM
   ========================= */
.contact-form{
    max-width:650px;
    margin:0 auto;
    display:grid;
    gap:1rem;
}
.form-group{display:flex;flex-direction:column;}
label{margin-bottom:.35rem;font-weight:500;color:var(--clr-text-700);}
input[type='text'],input[type='email'],textarea{
    padding:.75rem 1rem;
    border:1px solid var(--clr-bg-300);
    background:var(--clr-bg-glass);
    backdrop-filter:blur(var(--blur-glass));
    border-radius:var(--radius-card);
    color:var(--clr-text-900);
    font-family:'Work Sans',sans-serif;
}
textarea{resize:vertical;}

/* =========================
   FOOTER
   ========================= */
.site-footer{
    color:#fff;
    padding:2.5rem 0;
    text-align:center;
}
.footer-container{
    display:flex;
    flex-direction:column;
    gap:1.25rem;
}
.footer-links a,.social-links a{
    margin:0 .75rem;
    color:#fff;
    text-decoration:underline;
}
.social-links a{font-weight:600;}
.social-links a:hover,.footer-links a:hover{color:var(--clr-accent);}

/* =========================
   SUCCESS PAGE
   ========================= */
.success-wrapper{
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    flex-direction:column;
    gap:1rem;
}
.success-wrapper h1{color:var(--clr-accent);}
.success-wrapper a.btn{background:var(--clr-accent);}

/* =========================
   LEGAL PAGES (privacy & terms)
   ========================= */
.legal-page{padding-top:100px;padding-bottom:60px;}
.legal-page h2{text-align:left;}
.legal-page p{margin-bottom:1rem;}

/* =========================
   MORPHING ANIMATION
   ========================= */
@keyframes morph{
    0%{border-radius:45% 55% 70% 30%/45% 55% 45% 55%;}
    50%{border-radius:70% 30% 45% 55%/60% 40% 60% 40%;}
    100%{border-radius:45% 55% 70% 30%/45% 55% 45% 55%;}
}
.morph{animation:morph 8s ease-in-out infinite;}

/* =========================
   READ MORE LINK
   ========================= */
.read-more{
    display:inline-block;
    margin-top:.5rem;
    font-weight:600;
    position:relative;
}
.read-more::after{
    content:'';
    position:absolute;
    bottom:0;
    left:0;
    width:100%;
    height:2px;
    background:var(--clr-accent);
    transform:scaleX(0);
    transform-origin:left;
    transition:var(--transition-base);
}
.read-more:hover::after{transform:scaleX(1);}

/* =========================
   UTILITIES
   ========================= */
.text-center{text-align:center!important;}
.is-two-thirds{flex:0 0 66.666%;max-width:66.666%;}
/* Media adjustments */
@media(max-width:600px){
    .hero-title{font-size:2rem;}
    .hero-section{padding:120px 0 100px 0;}
}
.site-footer {
    color: #fff;
    padding: 2.5rem 0;
    text-align: center;
    background: black;
}

@media (max-width: 820px) {
    .navigation ul {
        position: fixed;
        inset: 0 0 0 auto;
        width: 280px;
        padding: 120px 2rem;
        flex-direction: column;
        background: rgba(0, 0, 0, .9);
        transform: translateX(100%);
        transition: var(--transition-base);
        z-index: 999;
    }
}
@media (max-width: 820px) {
    .navigation ul.open {
        transform: translateX(0);
        height: 100vh;
    }
    .legal-page {
    padding-top: 0px;
    padding-bottom: 60px;
}
}
