/* ==========================================================================
   ISB Vietnam Standalone FAQ Page - Design System & Variables
   Matching Homepage & Articles Page Styling Guidelines
   ========================================================================== */

:root {
    /* ISB Brand Color Palette */
    --isb-navy-dark: #0f172a;       /* Hero banner background */
    --isb-blue-primary: #0056b3;    /* Main brand blue */
    --isb-blue-hover: #004085;      /* Darker blue hover */
    --isb-blue-light: #eef5ff;      /* Light blue highlight */
    --isb-red-accent: #e60012;      /* Japanese heritage accent red */
    
    /* Typography Colors */
    --isb-text-main: #1e293b;       /* Dark slate for body copy */
    --isb-text-muted: #64748b;      /* Muted text for captions/subtitles */
    --isb-text-light: #94a3b8;      /* Light placeholder text */

    /* Backgrounds & Elements */
    --isb-bg-page: #f8fafc;         /* Page background tone */
    --isb-bg-card: #ffffff;         /* White container cards */
    --isb-border-color: #e2e8f0;    /* Subtle light borders */
    --isb-border-active: #0056b3;   /* Highlighted state borders */

    /* Spacing & Radii */
    --isb-container-width: 1140px;
    --isb-radius-sm: 6px;
    --isb-radius-md: 10px;
    --isb-radius-lg: 16px;
    
    --isb-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --isb-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --isb-shadow-lg: 0 10px 25px rgba(15, 23, 42, 0.08);

    --isb-font: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --isb-transition: all 0.25s ease-in-out;
}

/* ==========================================================================
   Base CSS Reset
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body.isb-standalone-faq-page {
    font-family: var(--isb-font);
    background-color: var(--isb-bg-page);
    color: var(--isb-text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.isb-container {
    max-width: var(--isb-container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   Hero Section & Search Bar (Updated with Tech FAQ Icon Banner Background)
   ========================================================================== */
.isb-page-hero {
    /* Integrates the abstract tech banner with glowing FAQ icon background & dark gradient overlay */
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.75) 0%, rgba(15, 23, 42, 0.88) 100%),
        url('../../images/faq/faq-banner.webp') center/cover no-repeat;
    color: #ffffff;
    padding: 60px 0 80px 0;
    text-align: center;
    position: relative;
}

/* Breadcrumbs */
.isb-breadcrumbs {
    font-size: 0.875rem;
    color: #94a3b8;
    margin-bottom: 20px;
}

.isb-breadcrumbs a {
    color: #cbd5e1;
    text-decoration: none;
    transition: var(--isb-transition);
}

.isb-breadcrumbs a:hover {
    color: #ffffff;
}

.isb-breadcrumbs .separator {
    margin: 0 8px;
    color: #64748b;
}

.isb-breadcrumbs .current {
    color: #ffffff;
    font-weight: 500;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-description {
    font-size: 1.125rem;
    color: #e2e8f0;
    max-width: 720px;
    margin: 0 auto 36px auto;
    font-weight: 400;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Live Search Bar */
.faq-search-wrapper {
    position: relative;
    max-width: 640px;
    margin: 0 auto;
}

.faq-search-wrapper input {
    width: 100%;
    padding: 16px 50px 16px 24px;
    font-size: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    background-color: rgba(255, 255, 255, 0.98);
    color: var(--isb-text-main);
    box-shadow: var(--isb-shadow-lg);
    outline: none;
    transition: var(--isb-transition);
}

.faq-search-wrapper input:focus {
    background-color: #ffffff;
    border-color: var(--isb-blue-primary);
    box-shadow: 0 0 0 4px rgba(0, 86, 179, 0.3);
}

.faq-search-wrapper .search-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1rem;
    pointer-events: none;
    opacity: 0.6;
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.isb-main-content {
    padding: 50px 0 90px 0;
}

/* Category Tabs Navigation */
.faq-category-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 50px;
}

.tab-btn {
    background-color: var(--isb-bg-card);
    border: 1px solid var(--isb-border-color);
    color: var(--isb-text-muted);
    padding: 10px 22px;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--isb-transition);
}

.tab-btn:hover {
    color: var(--isb-blue-primary);
    border-color: #cbd5e1;
    background-color: #f1f5f9;
}

.tab-btn.active {
    background-color: var(--isb-blue-primary);
    color: #ffffff;
    border-color: var(--isb-blue-primary);
    box-shadow: 0 4px 12px rgba(0, 86, 179, 0.2);
}

/* FAQ Accordion Groups */
.faq-group {
    margin-bottom: 48px;
}

.group-heading {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--isb-navy-dark);
    margin-bottom: 20px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--isb-blue-primary);
    display: inline-block;
}

/* Accordion Card Item */
.faq-accordion-item {
    background-color: var(--isb-bg-card);
    border: 1px solid var(--isb-border-color);
    border-radius: var(--isb-radius-md);
    margin-bottom: 14px;
    overflow: hidden;
    box-shadow: var(--isb-shadow-sm);
    transition: var(--isb-transition);
}

.faq-accordion-item:hover {
    border-color: #cbd5e1;
    box-shadow: var(--isb-shadow-md);
}

.faq-accordion-item.active {
    border-color: var(--isb-border-active);
    box-shadow: var(--isb-shadow-md);
}

.accordion-trigger {
    width: 100%;
    background: transparent;
    border: none;
    padding: 22px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
}

.question-text {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--isb-navy-dark);
    transition: color 0.2s ease;
}

.faq-accordion-item.active .question-text,
.accordion-trigger:hover .question-text {
    color: var(--isb-blue-primary);
}

/* Custom +/- Toggle Icon */
.toggle-icon {
    position: relative;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-left: 20px;
}

.toggle-icon::before,
.toggle-icon::after {
    content: '';
    position: absolute;
    background-color: var(--isb-blue-primary);
    transition: transform 0.3s ease;
}

.toggle-icon::before {
    top: 7px;
    left: 0;
    width: 16px;
    height: 2px;
}

.toggle-icon::after {
    top: 0;
    left: 7px;
    width: 2px;
    height: 16px;
}

.faq-accordion-item.active .toggle-icon::after {
    transform: rotate(90deg);
    opacity: 0;
}

.faq-accordion-item.active .toggle-icon::before {
    background-color: var(--isb-red-accent);
}

/* Accordion Panel Animation */
.accordion-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
    background-color: var(--isb-bg-card);
}

.faq-accordion-item.active .accordion-panel {
    max-height: 1000px;
    transition: max-height 0.5s cubic-bezier(1, 0, 1, 0);
}

.panel-inner {
    padding: 0 28px 24px 28px;
    color: var(--isb-text-main);
    font-size: 0.98rem;
    line-height: 1.7;
    border-top: 1px solid #f1f5f9;
    margin-top: -4px;
    padding-top: 16px;
}

/* No Search Results Message */
.no-results-msg {
    text-align: center;
    padding: 40px 20px;
    background: var(--isb-bg-card);
    border-radius: var(--isb-radius-md);
    border: 1px dashed var(--isb-border-color);
    color: var(--isb-text-muted);
}

.no-results-msg a {
    color: var(--isb-blue-primary);
    font-weight: 600;
}

/* ==========================================================================
   Lead Generation Call to Action (CTA) Card
   ========================================================================== */
.isb-cta-card {
    margin-top: 60px;
    background: linear-gradient(135deg, #ffffff 0%, var(--isb-blue-light) 100%);
    border: 1px solid #bfdbfe;
    border-radius: var(--isb-radius-lg);
    padding: 40px 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--isb-shadow-md);
}

.cta-content h2 {
    font-size: 1.5rem;
    color: var(--isb-navy-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.cta-content p {
    color: var(--isb-text-muted);
    font-size: 0.98rem;
    max-width: 600px;
}

.isb-btn-primary {
    display: inline-block;
    background-color: var(--isb-blue-primary);
    color: #ffffff;
    font-weight: 600;
    padding: 14px 28px;
    border-radius: 30px;
    text-decoration: none;
    transition: var(--isb-transition);
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 86, 179, 0.25);
}

.isb-btn-primary:hover {
    background-color: var(--isb-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 86, 179, 0.35);
    color: #fff;
}

/* ==========================================================================
   Responsive Utilities
   ========================================================================== */
@media (max-width: 900px) {
    .isb-cta-card {
        flex-direction: column;
        text-align: center;
        gap: 24px;
        padding: 32px 24px;
    }
}

@media (max-width: 640px) {
    .isb-page-hero {
        padding: 40px 0 60px 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .accordion-trigger {
        padding: 18px 20px;
    }

    .panel-inner {
        padding: 0 20px 20px 20px;
    }

    .tab-btn {
        padding: 8px 16px;
        font-size: 0.88rem;
    }
}