:root {
    --primary-color: #4299e1; /* Blue-500 */
    --primary-light: #63b3ed;
    --text-dark: #2d3748; /* Gray-800 */
    --text-light: #4a5568; /* Gray-600 */
    --bg-light: #f7fafc; /* Gray-50 */
    --bg-white: #ffffff;
    --border-color: #edf2f7; /* Gray-100 */
}

/* --- Header / Hero Section --- */
.entry-header {
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
}

.entry-header .subtitle {
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-light);
}

/* --- 3-Step Guide (Progress Bar) --- */
.guide-section {
    background-color: var(--bg-white);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.guide-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 50px;
    position: relative;
}
.guide-progress-bar {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 50%;
    height: 4px;
    background-color: var(--border-color);
    width: 80%;
    border-radius: 2px;
    z-index: 1;
}
.guide-progress-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.5s ease-in-out;
}
.step-indicator {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--border-color);
    color: var(--text-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    font-size: 1.2rem;
    z-index: 2;
    transition: all 0.3s ease;
    position: relative;
}
.step-indicator.active {
    background-color: var(--primary-color);
    color: var(--bg-white);
    transform: scale(1.1);
    box-shadow: 0 0 0 5px rgba(66, 153, 225, 0.3);
}

.guide-steps {
    display: flex;
    flex-direction: column;
    gap: 40px;
}
.guide-step-item {
    display: flex;
    align-items: flex-start;
    gap: 30px;
    padding: 20px;
    border-radius: 8px;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
}
.guide-step-item .step-number {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary-color);
    opacity: 0.7;
    flex-shrink: 0;
    line-height: 1;
}
.guide-step-item h3 { margin-top: 0; font-size: 1.4rem; }
.guide-step-item img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin-top: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

/* --- Applications & Tips --- */
.section-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}
.feature-card {
    background-color: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
    border-color: var(--primary-color);
}
.feature-card .icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}
.feature-card h4 { font-size: 1.2rem; margin-bottom: 10px; color: var(--text-dark); }
.feature-card code {
    background-color: var(--bg-light);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9rem;
}

/* --- FAQ (Accordion) --- */
.faq-item {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 10px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}
.faq-question {
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-dark);
    transition: background-color 0.3s ease;
}
.faq-question:hover {
    background-color: var(--bg-light);
}
.faq-question::after {
    content: '\f078'; /* Font Awesome down arrow */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    margin-left: 15px;
    transition: transform 0.3s ease;
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 20px;
    transition: max-height 0.4s ease-out, padding 0.4s ease-out;
}
.faq-item.active .faq-answer {
    max-height: 200px; /* Adjust as needed */
    padding: 0 20px 20px 20px;
}
.faq-item.active .faq-question::after {
    transform: rotate(180deg);
}

/* --- Final CTA --- */
.final-cta {
    text-align: center;
    background-color: var(--bg-light);
    padding: 50px 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}
.final-cta h2 { border-bottom: none; margin-bottom: 20px; }
.cta-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: 15px 35px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 700;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(66, 153, 225, 0.3);
    margin-top: 20px;
}
.cta-button:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 30px rgba(66, 153, 225, 0.4);
    text-decoration: none;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .guide-section { padding: 20px; }
    .guide-step-item { flex-direction: column; text-align: center; }
    .guide-step-item .step-number { margin: 0 auto 15px auto; }
    .guide-progress-bar { width: 70%; }

}