/* App Shell */
#app {
    min-height: 100vh;
}

.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Top Navigation Bar */
.navbar {
    background: var(--color-bg-card);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.nav-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* Overview Page */
.hero-header {
    text-align: center;
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(to bottom, var(--color-primary-light), var(--color-bg-body));
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-xxl);
}

.hero-title {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.category-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.category-card {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.category-card-header {
    padding: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: white;
}

.category-icon {
    font-size: 2.5rem;
}

.category-card-body {
    padding: var(--spacing-lg);
    flex-grow: 1;
}

/* Category Detail Page */
.category-header {
    padding: var(--spacing-xxl);
    border-radius: var(--border-radius-lg);
    color: white;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.project-list {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.project-card {
    padding: var(--spacing-lg);
    cursor: pointer;
    border-top: 4px solid var(--color-primary);
}

/* Project Detail Page (A4 Paper Style) */
.paper-container {
    background: var(--color-bg-card);
    max-width: 800px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
    border-radius: 0; /* Flat like paper */
    position: relative;
    overflow: hidden;
}

.paper-header {
    padding: var(--spacing-xxl);
    background: var(--color-bg-body);
    border-bottom: 1px solid var(--color-border);
}

.paper-meta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-border);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.meta-icon {
    color: var(--color-primary);
    font-size: 1.25rem;
}

.paper-body {
    padding: var(--spacing-xxl);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-primary-light);
    padding-bottom: var(--spacing-xs);
}

.highlights-list {
    list-style: none;
}

.highlights-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.highlights-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: bold;
}

.stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    margin-top: var(--spacing-lg);
}

/* Footer CTA */
.paper-footer {
    background: var(--color-primary-light);
    padding: var(--spacing-xxl);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.cta-box {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    max-width: 400px;
    margin: 0 auto;
    box-shadow: var(--shadow-sm);
}

.qr-placeholder {
    width: 150px;
    height: 150px;
    background: #f0f0f0;
    border: 2px dashed #ccc;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 0.875rem;
}

/* ===============================
   Trust System Styles (Block A-D)
   =============================== */

/* Block A: Trust Banner */
.trust-banner {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--color-border);
}

.company-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    flex: 1;
    min-width: 250px;
}

.company-info .company-name {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-text-primary);
}

.company-info .company-reg {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.company-badges {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-xs);
}

.trust-badge {
    background: var(--color-bg-body);
    color: var(--color-primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--color-primary-light);
}

.authorizations {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.auth-item {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--color-bg-body);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--color-border);
}

/* Block B: Cases Section */
.cases-section {
    padding: var(--spacing-xxl) 0;
    border-top: 1px solid var(--color-border);
}

.cases-carousel {
    overflow-x: auto;
    padding-bottom: var(--spacing-md);
    scrollbar-width: thin;
}

.carousel-track {
    display: flex;
    gap: var(--spacing-md);
    min-width: max-content;
}

.carousel-img-placeholder {
    width: 280px;
    height: 200px;
    background: #f8f9fa;
    border: 2px dashed #dce1e6;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #a0aec0;
    font-size: 0.9rem;
    flex-direction: column;
    gap: 8px;
}

.cases-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.case-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border-left: 4px solid var(--color-secondary);
}

.case-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.case-name {
    font-weight: 700;
    color: var(--color-primary);
}

.case-tag {
    font-size: 0.75rem;
    background: var(--color-bg-body);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--color-text-light);
}

.case-project {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.case-result {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Block C: Timeline Steps */
.steps-timeline {
    position: relative;
    padding-left: 20px;
}

.steps-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    bottom: 5px;
    width: 2px;
    background: var(--color-primary-light);
}

.timeline-step {
    position: relative;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
}

.timeline-step::before {
    content: '';
    position: absolute;
    left: -25px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--color-primary);
}

.timeline-step:last-child {
    margin-bottom: 0;
}

/* Block D: Risk Note */
.risk-note {
    background: #fdf5f5;
    border-left: 4px solid #e74c3c;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
    font-size: 0.95rem;
    color: #c0392b;
    line-height: 1.6;
    margin-top: var(--spacing-xl);
}

/* ===============================
   Content Strategy Upgrades
   =============================== */

/* Age Diagnostic Tool */
.age-diagnostic-tool {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.age-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.age-btn {
    border-radius: 20px;
    padding: 8px 16px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.age-btn.active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Video Container */
.video-container {
    width: 100%;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    background: #000;
    aspect-ratio: 16 / 9;
}

.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #2c3e50, #3498db);
    cursor: pointer;
}

/* Compare Table */
.compare-table-wrapper {
    overflow-x: auto;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    text-align: left;
}

.compare-table th {
    background: var(--color-primary);
    color: white;
    padding: 12px 16px;
    font-weight: 600;
}

.compare-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.compare-table tr:last-child td {
    border-bottom: none;
}

/* FAQ Details/Summary */
.faq-list details {
    background: white;
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.faq-list summary {
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 600;
    cursor: pointer;
    background: #f8f9fa;
    color: var(--color-text-primary);
    list-style: none; /* Hide default arrow */
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-list summary::-webkit-details-marker {
    display: none;
}

.faq-list summary::after {
    content: '+';
    color: var(--color-primary);
    font-size: 1.25rem;
    font-weight: bold;
}

.faq-list details[open] summary::after {
    content: '-';
}

.faq-list .faq-answer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Cost Overview */
.cost-overview {
    background: #f0fdf4; /* Light green bg */
    border-left: 4px solid #27ae60;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}


/* ===============================
   Mobile Responsive Styles
   =============================== */
@media (max-width: 768px) {
    /* Navigation */
    .navbar {
        padding: var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* Container Spacing */
    .container {
        padding: var(--spacing-md);
    }

    /* Hero Section */
    .hero-header {
        padding: var(--spacing-xl) var(--spacing-md);
        margin-bottom: var(--spacing-xl);
    }
    .hero-title {
        font-size: 1.8rem;
    }

    /* Trust Banner */
    .trust-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    .trust-banner .company-info {
        width: 100%;
    }
    .trust-banner .company-info:nth-child(2) {
        border-left: none !important;
        padding-left: 0 !important;
        border-top: 1px dashed var(--color-border);
        padding-top: var(--spacing-md);
    }

    /* Age Filters */
    .age-diagnostic-tool {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    .age-btn {
        padding: 6px 12px;
        font-size: 0.85rem;
    }

    /* Category View */
    .category-header > div:last-child {
        flex-direction: column;
        text-align: center;
    }

    /* Paper Document (Project View) */
    .paper-header {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    .paper-body {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    .paper-footer {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    /* Meta Grid */
    .paper-meta-grid {
        grid-template-columns: 1fr;
    }

    /* Compare Table */
    .compare-table {
        white-space: nowrap;
    }

    /* Call to Action Footer */
    .cta-box {
        padding: var(--spacing-lg);
    }
}