body { font-family: Arial, sans-serif; background: #1a1a1a; color: #fff; margin: 0; padding: 20px; }
.container { max-width: 1000px; margin: 0 auto; background: #2a2a2a; padding: 30px; border-radius: 8px; border: 1px solid #444; }
.header { text-align: center; margin-bottom: 30px; border-bottom: 2px solid #0056b3; padding-bottom: 20px; }
.logo-text { font-size: 28px; font-weight: bold; letter-spacing: 2px; }
.logo-maxi { color: #ffffff; }
.logo-chiptuning { color: #007bff; }
.logo-sub { font-size: 14px; color: #888; font-style: italic; margin-top: 5px; }
.nav-buttons { display: flex; justify-content: space-between; margin-bottom: 30px; }
.btn { background: #007bff; color: #fff; border: none; padding: 10px 20px; cursor: pointer; font-weight: bold; border-radius: 4px; transition: background 0.2s; text-decoration: none; display: inline-block; }
.btn:hover { background: #0056b3; }
.btn-secondary { background: #444; }
.btn-secondary:hover { background: #555; }

.accordion-btn { background: #333; color: #fff; cursor: pointer; padding: 15px; width: 100%; border: 1px solid #444; text-align: left; font-size: 16px; font-weight: bold; border-radius: 4px; margin-bottom: 5px; transition: background 0.3s; display: flex; align-items: center; }
.accordion-btn:hover { background: #3c3c3c; border-color: #007bff; }
.accordion-btn.active { background: #007bff; border-color: #0056b3; }
.accordion-content { padding: 0 18px; background-color: #222; max-height: 0; overflow: hidden; transition: max-height 0.2s ease-out; border-radius: 0 0 4px 4px; margin-bottom: 10px; }

.form-row { display: flex; gap: 15px; margin: 15px 0; }
.form-group { flex: 1; }
label { display: block; margin-bottom: 5px; font-size: 13px; color: #ccc; }
select { width: 100%; padding: 10px; background: #2a2a2a; color: #fff; border: 1px solid #555; border-radius: 4px; box-sizing: border-box; }
select:focus { border-color: #007bff; outline: none; }

.specs-box { background: #333; padding: 20px; border-radius: 6px; margin-top: 20px; border: 1px solid #444; }
.specs-title { font-size: 16px; font-weight: bold; color: #007bff; margin-bottom: 15px; border-bottom: 1px solid #444; padding-bottom: 8px; }
.specs-row { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 14px; }
.specs-value { font-weight: bold; color: #00ff00; }