:root {
    --lemon: #FFE135;
    --black: #111111;
    --white: #ffffff;
    --gray: #333333;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: linear-gradient(135deg, #FFF9C4 0%, var(--lemon) 50%, #FFF176 100%);
    color: var(--black);
    min-height: 100vh;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.9rem 1.5rem;
    background: rgba(255, 225, 53, 0.96);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.nav-brand {
    font-weight: 800;
    font-size: 1.4rem;
    text-decoration: none;
    color: var(--black);
}

.nav-toggle {
    display: block;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
}

.nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #FFE135;
    flex-direction: column;
    padding: 1rem 1.5rem 1.5rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.nav-links.active { display: flex; }

.nav-links a {
    text-decoration: none;
    color: #111;
    font-weight: 600;
    padding: 0.65rem 0;
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.section { padding: 3rem 1.5rem; max-width: 1100px; margin: 0 auto; }
h1 { font-size: clamp(2.2rem, 6vw, 3.5rem); font-weight: 800; margin-bottom: 0.6rem; }
h2 { font-size: 1.8rem; margin-bottom: 1rem; }
.sub { font-size: 1.2rem; margin-bottom: 1rem; color: #222; }
.desc { line-height: 1.6; margin-bottom: 1.5rem; max-width: 700px; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.2rem; margin-top: 1.5rem; }
.card { background: white; border-radius: 14px; padding: 1.4rem; box-shadow: 0 8px 20px rgba(0,0,0,0.08); }
.card h3 { margin-bottom: 0.5rem; }

.btn { display: inline-block; background: #111; color: var(--lemon); padding: 0.8rem 1.6rem; border-radius: 50px; text-decoration: none; font-weight: 700; margin-top: 0.5rem; }
.btn:hover { transform: translateY(-2px); }

.hero { text-align: center; padding: 4rem 1.5rem 2rem; }
footer { text-align: center; padding: 2rem; background: rgba(0,0,0,0.05); margin-top: 2rem; }

/* Business Model styles */
.bm-hero { display: flex; align-items: center; gap: 2.5rem; padding: 3rem 1.5rem; max-width: 1100px; margin: 0 auto; flex-wrap: wrap; }
.bm-hero-text { flex: 1; min-width: 280px; }
.bm-hero-text h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); }
.bm-sub { font-size: 1.25rem; font-weight: 600; margin: 0.6rem 0 1rem; }
.bm-desc { line-height: 1.6; max-width: 520px; }
.bm-hero-img { flex: 1; min-width: 260px; text-align: center; }
.bm-hero-img img { max-width: 100%; border-radius: 14px; box-shadow: 0 12px 30px rgba(0,0,0,0.1); }
.img-fallback { background: white; border: 2px dashed #111; border-radius: 14px; padding: 3rem 1rem; font-weight: 700; }

.logo-row { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; margin-top: 1.2rem; }
.logo-item { background: white; border-radius: 12px; padding: 1rem; display: flex; flex-direction: column; align-items: center; gap: 0.4rem; box-shadow: 0 6px 16px rgba(0,0,0,0.07); min-width: 110px; }
.logo-item img { height: 42px; width: auto; object-fit: contain; }
.logo-item span { font-weight: 600; font-size: 0.9rem; }
.logo-text small { color: #555; font-size: 0.8rem; }

.rental-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.2rem; margin-top: 1rem; }
.rental-card { background: white; border-radius: 14px; padding: 1.6rem; text-align: center; box-shadow: 0 8px 20px rgba(0,0,0,0.08); }
.rental-card .price { font-size: 2.2rem; font-weight: 800; }
.rental-card .period { color: #555; margin: 0.3rem 0 0.7rem; }
.highlight-card { border: 3px solid #FFE135; }

.swap-box { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-top: 1rem; }
.swap-point { background: white; border-radius: 12px; padding: 1.4rem; text-align: center; box-shadow: 0 6px 16px rgba(0,0,0,0.07); }
.swap-point h3 { font-size: 1.5rem; margin-bottom: 0.4rem; }

.feature-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.8rem; margin-top: 1rem; }
.feature { background: white; border-left: 4px solid #FFE135; padding: 0.9rem 1rem; border-radius: 8px; font-weight: 500; }

.roi-box { background: white; border-radius: 14px; padding: 2rem; max-width: 560px; margin: 1rem auto 0; text-align: center; box-shadow: 0 10px 25px rgba(0,0,0,0.1); }
.roi-number { font-size: 2.8rem; font-weight: 800; }
.roi-note { margin-top: 0.8rem; color: #555; }

.question-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0.8rem; margin-top: 1rem; }
.question-btn { background: #111; color: #FFE135; padding: 0.9rem 1rem; border-radius: 10px; text-decoration: none; font-weight: 600; text-align: center; display: block; }
.question-btn:hover { transform: translateY(-2px); }

.section-sub { color: #444; margin-bottom: 1rem; }

@media (max-width: 700px) {
    .bm-hero { flex-direction: column-reverse; text-align: center; padding: 2rem 1rem; }
    .bm-desc { margin-left: auto; margin-right: auto; }
}

@media (min-width: 900px) {
    .nav-links { display: flex; position: static; flex-direction: row; background: transparent; box-shadow: none; padding: 0; gap: 1.2rem; }
    .nav-links a { border: none; padding: 0; }
    .nav-toggle { display: none; }
}