:root{
    --blue:#1E2A38;
    --blue-soft:#2c4a70;
    --turquoise:#00C2B3;
    --yellow:#FFC83D;
    --light:#F4F6F8;
    --white:#ffffff;
}

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

body{
    font-family:'Poppins',sans-serif;
    background:var(--light);
    color:#2b2b2b;
    line-height:1.6;
}

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

header{
    background:
        linear-gradient(120deg, rgba(30,42,56,0.95), rgba(44,74,112,0.95)),
        url("/assets/img/hero-bg.jpg") center/cover no-repeat;
    color:white;
    padding:40px 8% 120px;
    position:relative;
    overflow:hidden;
}

header::after{
    content:"";
    position:absolute;
    inset:0;
    background:
        radial-gradient(circle at 20% 30%, rgba(0,194,179,0.15), transparent 40%),
        radial-gradient(circle at 80% 20%, rgba(255,200,61,0.15), transparent 40%);
    pointer-events:none;
}

/* NAV */
nav{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:80px;
    position:relative;
    z-index:2;
}

.logo{
    font-size:28px;
    font-weight:700;
    letter-spacing:1px;
    display:flex;
    align-items:center;
    gap:10px;
}

nav a{
    color:white;
    margin-left:28px;
    text-decoration:none;
    font-weight:500;
    opacity:0.9;
    transition:opacity .2s;
}

nav a:hover{
    opacity:1;
}

/* HERO */
.hero{
    display:grid;
    grid-template-columns:1.1fr .9fr;
    gap:60px;
    align-items:center;
    position:relative;
    z-index:2;
}

.hero h1{
    font-size:52px;
    line-height:1.15;
    font-weight:700;
}

.hero h1 span{
    color:var(--yellow);
}

.hero p{
    margin:30px 0;
    font-size:18px;
    opacity:.95;
    max-width:520px;
}

.hero-buttons a{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    padding:15px 34px;
    border-radius:12px;
    margin-right:18px;
    font-weight:600;
    text-decoration:none;
    transition:transform .2s, box-shadow .2s;
}

.hero-buttons a:hover{
    transform:translateY(-3px);
    box-shadow:0 10px 25px rgba(0,0,0,.2);
}

.btn-primary{
    background:var(--yellow);
    color:var(--blue);
}

.btn-secondary{
    border:2px solid rgba(255,255,255,.7);
    color:white;
}

/* ================= SECTIONS ================= */

section{
    padding:100px 8%;
}

.section-title{
    font-size:38px;
    margin-bottom:15px;
    color:var(--blue);
}

.section-sub{
    max-width:720px;
    margin-bottom:60px;
    font-size:18px;
    color:#555;
}

/* ================= FEATURES ================= */

.features{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:35px;
}

.feature{
    background:rgba(255,255,255,.85);
    backdrop-filter:blur(6px);
    padding:40px 30px;
    border-radius:22px;
    box-shadow:0 20px 45px rgba(0,0,0,0.08);
    transition:transform .25s, box-shadow .25s;
}

.feature:hover{
    transform:translateY(-6px);
    box-shadow:0 30px 60px rgba(0,0,0,0.12);
}

.feature h3{
    margin-bottom:12px;
    color:var(--blue);
    font-size:22px;
}

/* ================= CATEGORIES ================= */

.categories{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
    gap:35px;
}

.category{
    background:white;
    border-radius:22px;
    overflow:hidden;
    box-shadow:0 18px 40px rgba(0,0,0,0.08);
    transition:transform .25s, box-shadow .25s;
}

.category:hover{
    transform:translateY(-8px);
    box-shadow:0 28px 55px rgba(0,0,0,0.14);
}

.category img{
    width:100%;
    height:190px;
    object-fit:cover;
}

.category h3{
    padding:24px 20px;
    text-align:center;
    font-size:20px;
    color:var(--blue);
}

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

.cta{
    background:
        linear-gradient(120deg,#1E2A38,#2c4a70);
    color:white;
    text-align:center;
    padding:110px 8%;
    position:relative;
}

.cta::before{
    content:"";
    position:absolute;
    inset:0;
    background:
        radial-gradient(circle at 30% 30%, rgba(255,200,61,0.15), transparent 40%),
        radial-gradient(circle at 70% 60%, rgba(0,194,179,0.15), transparent 40%);
}

.cta h2{
    font-size:42px;
    margin-bottom:25px;
    position:relative;
    z-index:1;
}

.cta .btn-primary{
    font-size:18px;
    padding:16px 40px;
    position:relative;
    z-index:1;
}

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

footer{
    background:#0e1620;
    color:#aaa;
    padding:70px 8%;
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
    gap:50px;
}

footer h4{
    color:white;
    margin-bottom:18px;
    font-size:18px;
}

footer a{
    display:block;
    color:#aaa;
    text-decoration:none;
    margin-bottom:10px;
    transition:color .2s;
}

footer a:hover{
    color:white;
}

/* ================= RESPONSIVE ================= */

@media(max-width:900px){
    .hero{
        grid-template-columns:1fr;
    }
    .hero h1{
        font-size:40px;
    }
    section{
        padding:80px 6%;
    }
}
/* ===============================
   LERNEN – DESIGN SYSTEM
================================ */

.page-learn{
    padding:90px 8% 120px;
}

.page-learn h1{
    font-size:44px;
    color:var(--blue);
    margin-bottom:10px;
}

.page-learn > p{
    font-size:18px;
    color:#555;
    margin-bottom:60px;
    max-width:700px;
}

/* ===============================
   COURSE GRID
================================ */

.course-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
    gap:35px;
}

.course-card{
    background:rgba(255,255,255,.9);
    border-radius:22px;
    padding:34px 30px;
    box-shadow:0 20px 45px rgba(0,0,0,.08);
    position:relative;
    overflow:hidden;
    transition:transform .3s ease, box-shadow .3s ease;
}

/* Farbverlauf-Streifen */
.course-card::before{
    content:"";
    position:absolute;
    top:0;
    left:0;
    height:6px;
    width:100%;
    background:linear-gradient(90deg,var(--turquoise),var(--yellow));
}

.course-card:hover{
    transform:translateY(-10px);
    box-shadow:0 35px 65px rgba(0,0,0,.14);
}

.course-card h2{
    font-size:22px;
    margin-bottom:12px;
}

.course-card h2 a{
    text-decoration:none;
    color:var(--blue);
}

.course-card p{
    font-size:15px;
    color:#666;
    line-height:1.6;
}

/* ===============================
   FEATURE ICONS (SVG)
================================ */

.feature-icon{
    width:48px;
    height:48px;
    margin-bottom:18px;
}

.feature-icon svg{
    width:100%;
    height:100%;
    stroke:var(--turquoise);
    stroke-width:1.8;
    fill:none;
}

/* ===============================
   SCROLL ANIMATION
================================ */

.reveal{
    opacity:0;
    transform:translateY(40px);
    transition:opacity .7s ease, transform .7s ease;
}

.reveal.visible{
    opacity:1;
    transform:none;
}

/* ===============================
   RESPONSIVE
================================ */

@media(max-width:768px){
    .page-learn{
        padding:70px 6%;
    }
    .page-learn h1{
        font-size:36px;
    }
}