:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --primary-color: #bb86fc;
    --secondary-color: #03dac6;
    --muted-color: #888;
    --border-color: #333;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.7;
}

.howto-page {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 16px 60px;
}

.howto-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 740px;
    overflow: hidden;
}

/* Header */
.howto-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 28px 28px 0;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.howto-logo img {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

h1 {
    margin: 12px 28px 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
}

.howto-intro {
    margin: 10px 28px 0;
    color: var(--muted-color);
    font-size: 0.95rem;
}

/* Tabs */
.tabs {
    display: flex;
    background-color: #2a2a2a;
    border-bottom: 1px solid var(--border-color);
    margin-top: 24px;
}

.tab-btn {
    flex: 1;
    padding: 15px;
    background: none;
    border: none;
    color: var(--muted-color);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.25s;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: #fff;
    background-color: #333;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background-color: #333;
}

/* Tab content */
.tab-content {
    display: none;
    padding: 28px;
    animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Steps list */
.howto-steps {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: step;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.howto-steps > li {
    counter-increment: step;
    background-color: #1a1a1a;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px 22px;
    position: relative;
    padding-left: 64px;
}

.howto-steps > li::before {
    content: counter(step);
    position: absolute;
    left: 18px;
    top: 18px;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary-color), #9d50bb);
    color: #000;
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.howto-steps h2 {
    margin: 0 0 10px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary-color);
}

.howto-steps p {
    margin: 0 0 10px;
    color: var(--muted-color);
    font-size: 0.95rem;
}

.howto-steps ul {
    margin: 0;
    padding-left: 18px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.howto-steps ul li {
    color: var(--text-color);
    font-size: 0.95rem;
}

.howto-steps strong {
    color: #fff;
}

.howto-steps code {
    background-color: #2a2a2a;
    color: var(--secondary-color);
    padding: 2px 7px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
}

/* Inline link */
.howto-link {
    color: var(--secondary-color);
    text-decoration: none;
    border-bottom: 1px solid rgba(3, 218, 198, 0.4);
    transition: color 0.2s, border-bottom-color 0.2s;
}

.howto-link:hover {
    color: #fff;
    border-bottom-color: #fff;
}

/* Outro */
.howto-outro {
    margin: 28px 0 0;
    text-align: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Mobile */
@media (max-width: 520px) {
    .howto-page {
        padding: 16px 8px 40px;
    }

    h1 {
        font-size: 1.2rem;
        margin: 10px 16px 0;
    }

    .howto-logo,
    .howto-intro {
        padding-left: 0;
        margin-left: 16px;
        margin-right: 16px;
    }

    .tab-content {
        padding: 18px 16px;
    }

    .howto-steps > li {
        padding-left: 54px;
        padding-right: 14px;
    }
}