/* ============================
   FONT & BASE
============================ */
body {
    font-family: 'Lexend', sans-serif;
    background: #eef2f7;
    margin: 0;
    padding: 0;
    color: #1b1b1b;
}

.container {
    width: 92%;
    max-width: 1200px;
    margin: auto;
}

/* ============================
   NAVBAR
============================ */
.navbar {
    background: #ffffff;
    padding: 15px 0;
    border-bottom: 1px solid #e6e6e6;
    position: sticky;
    top: 0;
    z-index: 20;
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    width: 50px;
    height: 50px;
}

.logo-text {
    font-size: 28px;
    font-weight: 700;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 35px;
}

.nav-links a {
    text-decoration: none;
    font-size: 18px;
    color: #333;
    font-weight: 500;
    transition: 0.2s;
}

.nav-links a.active,
.nav-links a:hover {
    color: #1f49ff;
}

/* ============================
   HERO
============================ */
.hero {
    padding: 80px 0 40px 0;
}

.hero-title {
    font-size: 52px;
    font-weight: 700;
    margin-bottom: 10px;
}

.hero-subtitle {
    font-size: 20px;
    color: #444;
    max-width: 800px;
}

.hero-buttons {
    margin-top: 30px;
    display: flex;
    gap: 18px;
}

/* ============================
   BUTTONS
============================ */
.btn-primary {
    background: #1f49ff;
    padding: 14px 34px;
    border-radius: 12px;
    font-size: 18px;
    color: #fff;
    text-decoration: none;
    transition: 0.2s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: #1536cc;
}

.btn-secondary {
    background: #fff;
    color: #1f49ff;
    padding: 14px 34px;
    border-radius: 12px;
    border: 2px solid #1f49ff;
    font-size: 18px;
    text-decoration: none;
    cursor: pointer;
    transition: 0.2s;
}

.btn-secondary:hover {
    background: #eaf0ff;
}

/* ============================
   SEZIONI
============================ */
.section {
    padding: 60px 0;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 10px;
}

.section-subtitle {
    font-size: 20px;
    margin-bottom: 25px;
    color: #444;
}

.paragraph {
    font-size: 18px;
    line-height: 1.7;
    margin-bottom: 20px;
}

/* ============================
   HOW BOX
============================ */
.how-section {
    display: flex;
    justify-content: flex-end;
    padding-bottom: 60px;
}

.how-box {
    width: 480px;
    background: #fff;
    padding: 35px;
    border-radius: 22px;
    box-shadow: 0px 4px 18px rgba(0,0,0,0.08);
}

.how-box h3 {
    font-size: 26px;
}

/* ============================
   AREA MAPPA CONCETTUALE
============================ */
.input-area {
    width: 100%;
    max-width: 700px;
    min-height: 200px;
    font-size: 18px;
    padding: 12px;
    border-radius: 12px;
    border: 2px solid #dfe4ea;
    box-sizing: border-box;
}

.map-area {
    margin-top: 30px;
    padding: 25px;
    background: #fff;
    border-radius: 22px;
    min-height: 260px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.08);
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
}

.map-node {
    padding: 14px 22px;
    border-radius: 14px;
    cursor: pointer;
    font-size: 17px;
    transition: 0.2s;
    border: 2px solid transparent;
}

.map-node:hover {
    transform: scale(1.05);
}

.node-title { background: #1f49ff; color:#fff; }
.node-subtitle { background:#dbe4ff; color:#1f49ff; }
.node-concept { background:#e9ffe0; color:#2d7a00; }
.node-subconcept { background:#fff3d9; color:#b06500; }

.explanation-box {
    margin-top: 25px;
    background:#fff;
    padding: 25px;
    border-radius:18px;
    font-size:18px;
    box-shadow:0 4px 14px rgba(0,0,0,0.08);
}

/* ============================
   LETTURA ASSISTITA
============================ */
.reading-output {
    margin-top: 25px;
    line-height: 1.8;
    font-size: 22px;
    padding: 20px;
}

.highlight {
    background: yellow;
    padding: 3px;
    border-radius: 4px;
}

/* ============================
   MODALITÀ DSA
============================ */
.btn-dsa {
    background: #d9fdd3;
    color: #19692c;
    border: 2px solid #8cd99b;
    padding: 12px 28px;
    border-radius: 12px;
    font-size: 18px;
    cursor: pointer;
    transition: 0.2s;
}

.btn-dsa:hover {
    background: #c4f7be;
}

.dsa-active {
    background: #f3fff3 !important;
}

/* ============================
   RESPONSIVE MOBILE
============================ */
@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }

    .how-box {
        width: 100%;
    }

    .map-area {
        padding: 15px;
    }

    .nav-links {
        display: none;
    }

    /* Menù hamburger (se vorrai aggiungerlo dopo) */
}