/* ==========================================================================
   koreantestpapers.in - Fully Responsive Container Box Layout Styling
   Keywords: "korean test papers", "korean exam paper"
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Noto+Sans+KR:wght@400;500;700&display=swap');

:root {
    --primary: #1e3a8a;
    --primary-light: #2563eb;
    --primary-dark: #0f172a;
    --accent: #0284c7;
    --accent-cyan: #06b6d4;
    --success: #059669;
    --warning: #d97706;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-hero: #0f172a;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-light: #f8fafc;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
    --box-shadow-hover: 0 20px 25px -5px rgba(37, 99, 235, 0.1), 0 10px 10px -5px rgba(37, 99, 235, 0.04);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --font-main: 'Plus Jakarta Sans', 'Noto Sans KR', sans-serif;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: all 0.2s ease;
}

a:hover {
    color: var(--accent);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Top Bar */
.top-notification-bar {
    background: linear-gradient(90deg, #1e3a8a, #0284c7);
    color: #ffffff;
    font-size: 0.85rem;
    padding: 8px 12px;
    text-align: center;
    font-weight: 500;
}

.header-main {
    background: var(--bg-hero);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    position: relative;
}

.brand-logo-img {
    display: flex;
    align-items: center;
}

.site-header-logo {
    height: 46px;
    max-height: 50px;
    width: auto;
    object-fit: contain;
    border-radius: var(--radius-sm);
    transition: transform 0.2s ease;
}

.site-header-logo:hover {
    transform: scale(1.03);
}

/* Mobile Actions (Strictly Hidden on Desktop / PC) */
.mobile-header-actions {
    display: none !important;
}

/* Desktop Navigation Styling */
.site-nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
    list-style: none;
}

.nav-links a {
    color: #cbd5e1;
    font-weight: 600;
    font-size: 0.92rem;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
}

.nav-links a:hover, .nav-links a.active {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
}

.btn-header-cta {
    background: linear-gradient(135deg, #2563eb, #0284c7);
    color: #ffffff !important;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Hero Section Split Box Layout */
.hero-section {
    background: var(--bg-hero);
    color: var(--text-light);
    padding: 40px 0 60px 0;
    border-bottom: 4px solid var(--primary-light);
}

.hero-heading-box {
    text-align: center;
    margin-bottom: 32px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero-title {
    font-size: 2.3rem;
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 14px;
    background: linear-gradient(135deg, #ffffff 60%, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: #94a3b8;
    line-height: 1.6;
}

.hero-split-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    align-items: start;
}

/* Left Box & Right Box */
.hero-left-box {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.3);
}

.hero-right-box {
    background: #ffffff;
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
    border: 2px solid var(--primary-light);
}

.box-title-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 2px solid #334155;
}

.box-title-header h3 {
    font-size: 1.2rem;
    color: #ffffff;
    font-weight: 700;
}

.exam-nav-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.exam-item-card {
    background: #0f172a;
    border: 1px solid #334155;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.exam-item-info h4 {
    font-size: 0.95rem;
    color: #ffffff;
    font-weight: 600;
}

.exam-item-info p {
    font-size: 0.8rem;
    color: #94a3b8;
}

.tag-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    background: #2563eb;
    color: #ffffff;
}
.tag-badge.green { background: #059669; }
.tag-badge.amber { background: #d97706; }
.tag-badge.cyan { background: #0284c7; }

/* Live Quiz Widget */
.live-test-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.live-indicator {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #fef2f2;
    color: #dc2626;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.78rem;
}

.live-dot {
    width: 8px;
    height: 8px;
    background-color: #dc2626;
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.9; }
    50% { transform: scale(1.3); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.9; }
}

.quiz-card-box {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px;
    margin-bottom: 16px;
}

.quiz-question-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary-dark);
}

.quiz-options-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quiz-option-btn {
    background: #ffffff;
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    text-align: left;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
}

.quiz-option-btn.selected {
    background: #dbeafe;
    border-color: var(--primary-light);
}

.quiz-action-bar {
    display: flex;
    gap: 10px;
}

.btn-primary-action {
    flex: 1;
    background: var(--primary-light);
    color: #ffffff;
    border: none;
    padding: 12px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.92rem;
    cursor: pointer;
}

/* Stats Counter Bar */
.stats-grid-box {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: -30px auto 36px auto;
    position: relative;
    z-index: 10;
}

.stat-box-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    text-align: center;
    box-shadow: var(--box-shadow);
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-light);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Main Section Layout Containers */
.section-padding {
    padding: 40px 0;
}

.section-header-center {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 32px auto;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 10px;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Cards Grid Box Layout */
.card-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.card-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
}

.card-box h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--primary-dark);
}

.card-box p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
    flex-grow: 1;
}

/* Table Box Container */
.table-box-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow-x: auto;
    box-shadow: var(--box-shadow);
}

.responsive-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.responsive-table th {
    background: var(--primary-dark);
    color: #ffffff;
    padding: 14px 16px;
    font-size: 0.85rem;
    font-weight: 700;
    text-align: left;
}

.responsive-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.btn-download-sm {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary-light);
    color: #ffffff !important;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 700;
    white-space: nowrap;
}

/* SEO Content Containers */
.seo-content-box {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    margin-bottom: 28px;
    box-shadow: var(--box-shadow);
}

.seo-content-box h2 {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 3px solid var(--primary-light);
}

.seo-content-box h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin: 20px 0 10px 0;
}

.seo-content-box p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
    line-height: 1.7;
}

.seo-content-box ul, .seo-content-box ol {
    margin: 0 0 16px 20px;
    color: var(--text-secondary);
}

.callout-box {
    background: #eff6ff;
    border-left: 4px solid var(--primary-light);
    padding: 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 16px 0;
}

/* FAQ Items */
.faq-grid-box {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.faq-item-box {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px;
    box-shadow: var(--box-shadow);
}

.faq-question {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.faq-answer {
    font-size: 0.92rem;
    color: var(--text-secondary);
}

/* Footer Section */
.footer-main {
    background: var(--primary-dark);
    color: #94a3b8;
    padding: 48px 0 24px 0;
    margin-top: 48px;
    border-top: 1px solid #1e293b;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.footer-col h4 {
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 14px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links a {
    color: #94a3b8;
    font-size: 0.88rem;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
}

.tag-cloud-item {
    background: #1e293b;
    color: #cbd5e1;
    font-size: 0.75rem;
    padding: 4px 8px;
    border-radius: 4px;
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 20px;
    text-align: center;
    font-size: 0.85rem;
    color: #64748b;
}

/* ==========================================================================
   MOBILE RESPONSIVE NAVIGATION BREAKPOINTS
   ========================================================================== */
@media (max-width: 992px) {
    /* Show Mobile Header Actions only on mobile */
    .mobile-header-actions {
        display: flex !important;
        align-items: center;
        gap: 10px;
    }
    
    .btn-header-cta-mobile {
        background: linear-gradient(135deg, #2563eb, #0284c7);
        color: #ffffff !important;
        padding: 7px 14px;
        border-radius: var(--radius-sm);
        font-weight: 700;
        font-size: 0.82rem;
        box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
        white-space: nowrap;
    }

    .mobile-menu-toggle {
        background: rgba(255, 255, 255, 0.12);
        border: 1px solid rgba(255, 255, 255, 0.25);
        color: #ffffff;
        font-size: 1.5rem;
        padding: 4px 12px;
        border-radius: var(--radius-sm);
        cursor: pointer;
        line-height: 1;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .desktop-only-cta {
        display: none;
    }

    /* Mobile Menu Dropdown Panel */
    nav.site-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #0f172a;
        border-bottom: 3px solid var(--primary-light);
        display: none !important;
        padding: 16px 20px;
        box-shadow: 0 15px 30px rgba(0,0,0,0.5);
        z-index: 9999;
    }

    nav.site-nav.mobile-active {
        display: block !important;
    }

    .nav-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        width: 100%;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        width: 100%;
        padding: 12px 16px;
        font-size: 1.05rem;
        font-weight: 600;
        color: #f8fafc;
        background: #1e293b;
        border-radius: var(--radius-sm);
        border: 1px solid #334155;
    }

    .nav-links a:hover, .nav-links a.active {
        background: var(--primary-light);
        color: #ffffff;
    }

    .hero-split-container {
        grid-template-columns: 1fr;
    }
    .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .stats-grid-box {
        grid-template-columns: repeat(2, 1fr);
        margin-top: 20px;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    #questionBankContainer {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 1.6rem;
    }
    .hero-subtitle {
        font-size: 0.95rem;
    }
    .card-grid-4, .stats-grid-box {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .seo-content-box {
        padding: 20px;
    }
    .hero-left-box, .hero-right-box {
        padding: 18px;
    }
}