:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-sub: #6b7280;
    --border: #e5e7eb;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    padding: 40px 20px;
    margin: 0;
}

.main-wrapper {
    width: 100%;
    max-width: 520px;
}

/* Card Styles */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
    border: 1px solid var(--border);
}

.header h1, .header h2 {
    margin: 0 0 8px 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.header p {
    margin: 0 0 24px 0;
    color: var(--text-sub);
    font-size: 0.95rem;
}

/* Form Controls */
.controls-grid {
    display: grid;
    gap: 20px;
    margin-bottom: 30px;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-main);
}

.select-wrapper select {
    width: 100%;
    padding: 10px 12px;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background-color: #fff;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.select-wrapper select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.action-area {
    text-align: center;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.status-text {
    font-size: 0.8rem;
    color: var(--text-sub);
    margin-top: 10px;
}

/* Driver Section & OS Toggle */
.os-toggle-container {
    display: flex;
    background: #f1f5f9;
    padding: 4px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.os-btn {
    flex: 1;
    border: none;
    background: transparent;
    padding: 8px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    color: var(--text-sub);
    transition: all 0.2s;
}

.os-btn.active {
    background: white;
    color: var(--primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Driver Content Tabs */
.driver-content {
    display: none; /* Hidden by default */
    animation: fadeIn 0.3s ease;
}

.driver-content.active {
    display: block;
}

.driver-step {
    display: flex;
    align-items: center;
    background: #f8fafc;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 12px;
    border: 1px solid var(--border);
}

.step-num {
    background: var(--primary);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
    margin-right: 12px;
    flex-shrink: 0;
}

.step-text {
    display: flex;
    flex-direction: column;
}

.step-text a {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.9rem;
    margin-top: 2px;
}

.step-text a:hover {
    text-decoration: underline;
}

.note {
    font-size: 0.85rem;
    color: var(--text-sub);
    background: #fff3cd;
    color: #856404;
    padding: 10px;
    border-radius: 6px;
    margin-top: 15px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Main Layout adjustments */
.main-wrapper {
    max-width: 480px;
    width: 100%;
}

.header-center {
    text-align: center;
    margin-bottom: 25px;
}

/* DRIVER CARD STYLES */
.driver-card {
    padding: 0; /* Reset padding for cleaner tabs */
    overflow: hidden;
}

.driver-header {
    padding: 20px 25px;
    background: #f8fafc;
    border-bottom: 1px solid var(--border);
}

.driver-header h3 { margin: 0; font-size: 1.1rem; }
.driver-header .sub { margin: 4px 0 0 0; font-size: 0.85rem; color: var(--text-sub); }

/* TABS */
.driver-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
}

.driver-tab {
    flex: 1;
    padding: 12px;
    background: white;
    border: none;
    font-weight: 600;
    color: var(--text-sub);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.driver-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: #f0f7ff;
}

/* PANELS */
.driver-panel {
    display: none;
    padding: 20px;
}
.driver-panel.active { display: block; }

/* DRIVER ITEM ROW */
.driver-item {
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 12px;
    overflow: hidden;
}

.driver-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: white;
}

.chip-name { font-weight: 600; color: var(--text-main); }

.download-btn {
    font-size: 0.8rem;
    background: #eef2ff;
    color: var(--primary);
    padding: 6px 12px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
}
.download-btn:hover { background: #dbeafe; }

/* ACCORDION (The Magic Part) */
.accordion-header {
    background: #f8fafc;
    padding: 8px 15px;
    font-size: 0.8rem;
    color: #64748b;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border);
}

.accordion-header:hover { color: var(--primary); }

.arrow { transition: transform 0.3s ease; font-size: 0.7rem; }

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: #fff;
    font-size: 0.85rem;
    color: #475569;
}

.accordion-content ol {
    margin: 0;
    padding: 15px 15px 15px 35px;
}

.accordion-content li { margin-bottom: 6px; }

.code {
    background: #f1f5f9;
    padding: 2px 5px;
    border-radius: 4px;
    font-family: monospace;
    color: #c026d3;
}