/* ========== COLUMNS PAGE STYLES ========== */
:root {
    /* Centralized Configuration Panel */
    --column-filter-top-spacing: 160px;    /* Space ABOVE the blue box */
    --column-filter-bottom-spacing: 60px;  /* Space BELOW the blue box */
    --column-filter-inner-padding: 36px 40px; /* Vertical/Horizontal space inside the box (controls height) */
    --column-filter-width: min(1300px, 92vw); /* Width of the blue box (matched to cases.html) */
    --column-filter-font-size: 18px;       /* Font size of the filter links */
    --column-filter-radius: 4px;          /* Match cases.html desktop style */

    /* Tag Styling */
    --column-tag-bg: #01368a;
    --column-tag-color: #ffffff;
    --column-tag-radius: 4px;   /* Rectangular style matching Home page */
    --column-tag-size: 13px;
    --column-tag-padding: 6px 14px;

    /* Desktop Typography Tuning */
    --column-title-size: 20px;
    --column-category-size: 13px;

    /* ========== SP Tuning (Mobile) ========== */
    --sp-column-title-size: 16px;    /* Title font size on mobile */
    --sp-column-category-size: 12px; /* Category label font size on mobile */
    --sp-column-tag-size: 11px;      /* Tag/Chip font size on mobile */

    /* ========== COLUMN DETAIL CONFIGURATION ========== */
    --detail-article-top-spacing: 100px;    /* Space ABOVE the whole article section */
    --detail-article-bottom-spacing: 100px; /* Space BELOW the whole article section */
    
    --detail-title-top-padding: 0px;       /* Custom top padding for title area */
    --detail-title-bottom-padding: 60px;    /* Custom bottom padding for title area (gap above hero) */
    
    --detail-title-size: 36px;             /* Desktop title size */
    --detail-date-size: 15px;              /* Desktop date size */
    --detail-h2-size: 28px;                /* Desktop H2 size */
    --detail-h3-size: 22px;                /* Desktop H3 size */
    --detail-h4-size: 18px;                /* Desktop H4 size */
    --detail-body-size: 17px;              /* Desktop body text size */

    --detail-qa-question-weight: 400;      /* Question font weight */
    --detail-qa-answer-weight: 500;        /* Answer font weight - making it BOLDER */

    --detail-list-item-weight: 500;        /* Bullet point font weight */
    --detail-list-point-weight: 500;       /* Bold text weight for specific list items */
    --detail-list-square-size: 16px;       /* Size of the ■ symbol */
    --detail-list-bullet-size: 18px;       /* Size of the ・ symbol */

    --detail-back-btn-height: 50px;       /* Height of the button */
    --detail-back-btn-padding: 0 20px;    /* Internal space around text */
    --detail-back-btn-min-width: 170px;   /* Desktop minimum width */
    --detail-back-btn-size: 20px;         /* Desktop button text size */

    /* Column Detail SP (Mobile) Tuning */
    --sp-detail-article-top-spacing: 40px;
    --sp-detail-article-bottom-spacing: 60px;
    
    --sp-detail-title-top-padding: 0px;
    --sp-detail-title-bottom-padding: 24px;
    
    --sp-detail-title-size: 20px;
    --sp-detail-date-size: 13px;
    --sp-detail-h2-size: 18px;
    --sp-detail-h3-size: 16px;
    --sp-detail-h4-size: 16px;
    --sp-detail-body-size: 15px;

    --sp-detail-side-padding: 10vw;      /* Horizontal space for CONTENT only on mobile (L/R) */
    --sp-detail-header-image-side-padding: 6vw; /* Horizontal space for HEADER/IMAGE on mobile (L/R) */
    --sp-detail-back-btn-width: 140px;  /* Width of the "Column List" button on mobile */
    --sp-detail-back-btn-height: 40px;  /* Height of the button on mobile */
    --sp-detail-back-btn-padding: 0 10px; /* Internal space on mobile */
    --sp-detail-back-btn-min-width: auto; /* Reset desktop min-width */
    --sp-detail-back-btn-size: 18px;     /* Button text size on mobile */

    --sp-detail-list-square-size: 14px;  /* Mobile size of the ■ symbol */
    --sp-detail-list-bullet-size: 16px;  /* Mobile size of the ・ symbol */
}

.columns-page {
    background-color: #F8FAFC;
}

.columns-page-content {
    position: relative;
    overflow: hidden;
    background-color: #F8FAFC;
}

/* ========== CASES INTRO (HERO) ========== */
.columns-intro {
    position: relative;
    text-align: center;
    padding: 80px 16px 70px;
    background: transparent; /* No longer needs its own background color as wrapper has it */
    overflow: hidden;
}

/* Old CSS mesh removed — now using global bpo-mask-bg.png */

.columns-title {
    position: relative;
    z-index: 1;
    font-size: clamp(36px, 3.4vw, 54px);
    font-weight: 800;
    letter-spacing: 0.05em;
    color: #1f2a3c;
}

/* ========== FILTER SECTION ========== */
.columns-filter-section {
    background: transparent; /* No longer full-width blue */
    padding: 24px 0;
    position: relative;
    z-index: 2;
}

/* Old CSS mesh backdrop removed — now using global bpo-mask-bg.png */

.columns-filter-inner {
    position: relative;
    z-index: 1;
    width: var(--column-filter-width);
    margin: 0 auto;
    background-color: #01368a; /* Deep blue background based on screenshot */
    padding: var(--column-filter-inner-padding);
    border-radius: var(--column-filter-radius); /* Rounded desktop version */
    box-shadow: 0 10px 30px rgba(1, 54, 138, 0.15);
}

.columns-filter-list {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 32px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.columns-filter-link {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #ffffff;
    font-size: var(--column-filter-font-size);
    font-weight: 500;
    letter-spacing: 0.02em;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.columns-filter-link:hover {
    opacity: 1;
}

.columns-filter-link.active {
    font-weight: 800;
}

.columns-filter-square {
    width: 16px;
    height: 16px;
    background-color: transparent;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #ffffff;
    border-radius: 2px;
    position: relative;
    transition: all 0.2s ease;
}

.columns-filter-link.active .columns-filter-square {
    background-color: transparent;
    border-color: #ffffff;
}

.columns-filter-link.active .columns-filter-square::after {
    /* --- TICK ADJUSTMENT PANEL --- */
    --tick-width: 6px;
    --tick-height: 16px;
    --tick-top: -3px;
    --tick-left: 6px;
    /* ----------------------------- */

    content: "";
    position: absolute;
    left: var(--tick-left);
    top: var(--tick-top);
    width: var(--tick-width);
    height: var(--tick-height);
    border: solid #ffffff;
    border-width: 0 3px 3px 0;
    transform: rotate(45deg);
    animation: checkIn 0.3s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

@keyframes checkIn {
    0% {
        height: 0;
        width: 0;
        opacity: 0;
    }
    100% {
        height: var(--tick-height);
        width: var(--tick-width);
        opacity: 1;
    }
}

/* ========== GRID SECTION ========== */
.columns-grid-section {
    padding: 20px 0 100px;
    background: #F8FAFC;
}

.columns-grid-inner {
    width: min(1020px, 92vw);
    margin: 0 auto;
}

.columns-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
}

/* ========== COLUMN CARD ========== */
.column-card {
    display: block;
}

.column-card.hidden {
    display: none !important;
}

.column-card-link {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    transition: transform 0.3s ease;
}

.column-card-link:hover {
    transform: translateY(-4px);
}

.column-img-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: #e2e8f0;
    background-size: cover;
    background-position: center;
    margin-bottom: 20px;
    overflow: hidden;
}

.column-img-wrap::after {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(0, 53, 143, 0.15); /* #00358F at 15% opacity */
}

.column-tags {
    position: absolute;
    top: 16px;
    right: 16px;
    display: flex;
    gap: 8px;
    z-index: 2;
    flex-wrap: wrap;
    justify-content: flex-end;
    max-width: 80%;
}

.column-tag {
    background-color: var(--column-tag-bg);
    color: var(--column-tag-color);
    font-size: var(--column-tag-size);
    font-weight: 500;
    padding: var(--column-tag-padding);
    border-radius: var(--column-tag-radius);
    letter-spacing: 0.02em;
    line-height: 1;
}

.column-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.column-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.column-category {
    background-color: #dce7f9;
    color: #3b5072;
    padding: 4px 12px;
    font-size: var(--column-category-size);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.column-date {
    font-size: 14px;
    color: #555555;
    font-family: sans-serif;
    letter-spacing: 0.02em;
}

.column-title {
    font-size: var(--column-title-size);
    font-weight: 700;
    color: #2b3342;
    line-height: 1.5;
    margin: 0;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 900px) {
    .columns-filter-inner {
        padding: 24px 20px;
        display: flex;         /* CENTERED BLOCK */
        justify-content: center;
        align-items: center;
        border-radius: 0;      /* SHARP LOOK ON MOBILE! */
    }

    .columns-filter-list {
        flex-direction: column;
        align-items: flex-start; /* LEFT ALIGNED WITHIN CENTERED BLOCK! */
        gap: 16px;
    }

    .columns-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .column-title {
        font-size: var(--sp-column-title-size);
    }

    .column-category {
        font-size: var(--sp-column-category-size);
    }

    .column-tag {
        font-size: var(--sp-column-tag-size);
    }
}

@media (max-width: 560px) {
    .columns-filter-section {
        padding: 40px 0;
    }

    .columns-filter-inner {
        width: 100vw;
    }

    .columns-filter-link {
        font-size: 15px; /* You can make this a variable too if needed */
    }

    .columns-grid-section {
        padding: 10px 0 60px;
    }

    .column-title {
        font-size: var(--sp-column-title-size);
    }
}

/* ========== COLUMN DETAIL PAGE ========== */
.column-detail-page {
    background-color: #F8FAFC;
}

.column-detail-section {
    position: relative;
    padding-top: var(--detail-article-top-spacing);
    padding-bottom: var(--detail-article-bottom-spacing);
    background: #F8FAFC;
    overflow: hidden;
}

/* Old CSS mesh detail-bg removed — now using global bpo-mask-bg.png */

.column-detail-inner {
    position: relative;
    z-index: 1;
    width: min(960px, 92vw);
    margin: 0 auto;
}

.column-detail-header {
    text-align: left;
    padding-top: var(--detail-title-top-padding);
    margin-bottom: var(--detail-title-bottom-padding);
}

.column-detail-title {
    font-size: var(--detail-title-size);
    font-weight: 800;
    color: #1a233a;
    line-height: 1.45;
    letter-spacing: 0.02em;
    margin-bottom: 24px;
}

.column-detail-date {
    display: block;
    font-size: var(--detail-date-size);
    color: #4a5568;
    font-family: sans-serif;
}

.column-detail-hero {
    position: relative;
    margin: 0 auto 50px;
    width: 100%;
    max-width: 800px; /* Limit image width to avoid being too massive */
    overflow: hidden;
}

.column-detail-hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-color: rgba(0, 53, 143, 0.15); /* #00358F at 15% opacity */
    pointer-events: none;
}

.column-detail-hero-img {
    width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05); /* Optional soft shadow */
}

.column-detail-content {
    color: #333d4f;
    font-size: var(--detail-body-size);
    line-height: 1.8;
}

.column-detail-content h2 {
    font-size: var(--detail-h2-size);
    font-weight: 700;
    color: #1a233a;
    padding-bottom: 12px;
    margin: 60px 0 24px;
    border-bottom: 2px solid #0040a8;
    line-height: 1.4;
}

.column-detail-content h3 {
    font-size: var(--detail-h3-size);
    font-weight: 700;
    color: #1a233a;
    background-color: #eaf2ff; /* Light blue background as per screenshot */
    padding: 16px 20px;
    margin: 40px 0 20px;
    line-height: 1.5;
}

.column-detail-content h4 {
    font-size: var(--detail-h4-size);
    font-weight: 700;
    color: #1a233a;
    margin: 32px 0 16px;
    line-height: 1.5;
}

.column-detail-content p {
    margin-bottom: 24px;
    text-align: justify;
}

.qa-question {
    font-weight: var(--detail-qa-question-weight);
}

.qa-answer {
    font-weight: var(--detail-qa-answer-weight);
}

.column-bullet-item {
    font-weight: var(--detail-list-item-weight);
}

.column-detail-content .column-list-square {
    font-size: var(--detail-list-square-size);
    margin-right: 8px;
    line-height: 1;
    color: #1a233a; /* Deep navy matching headings */
    font-style: normal;
}

.column-detail-content .column-list-bullet {
    font-size: var(--detail-list-bullet-size);
    margin-right: 4px;
    line-height: 1;
    font-style: normal;
}

.column-detail-content .column-list-point {
    font-weight: var(--detail-list-point-weight);
}

@media (max-width: 900px) {
    .column-list-square {
        font-size: var(--sp-detail-list-square-size);
    }
    .column-list-bullet {
        font-size: var(--sp-detail-list-bullet-size);
    }
}

.column-back-btn-wrap {
    text-align: center;
    margin-top: 80px;
}

.column-back-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: var(--detail-back-btn-min-width);
    height: var(--detail-back-btn-height);
    padding: var(--detail-back-btn-padding);
    background-color: #ffffff;
    border: 1px solid #0040a8;
    color: #0040a8;
    font-size: var(--detail-back-btn-size);
    font-weight: 700;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.column-back-btn:hover {
    background-color: #0040a8;
    color: #ffffff;
}

@media (max-width: 900px) {
    .column-intro {
        padding: 50px 16px 40px;
    }

    .columns-filter-section {
        padding: 32px 0;
    }

    .column-detail-section {
        padding-top: var(--sp-detail-article-top-spacing);
        padding-bottom: var(--sp-detail-article-bottom-spacing);
    }

    .column-detail-inner {
        width: 100%;
    }
    
    .column-detail-header {
        padding-top: var(--sp-detail-title-top-padding);
        padding-left: var(--sp-detail-header-image-side-padding);
        padding-right: var(--sp-detail-header-image-side-padding);
        margin-bottom: var(--sp-detail-title-bottom-padding);
    }
    
    .column-detail-title {
        font-size: var(--sp-detail-title-size);
        line-height: 1.4;
    }
    
    .column-detail-date {
        font-size: var(--sp-detail-date-size);
    }
    
    .column-detail-hero {
        width: auto;
        margin-left: var(--sp-detail-header-image-side-padding);
        margin-right: var(--sp-detail-header-image-side-padding);
        margin-bottom: 32px;
    }
    
    .column-detail-content {
        font-size: var(--sp-detail-body-size);
        padding-left: var(--sp-detail-side-padding);
        padding-right: var(--sp-detail-side-padding);
    }

    .column-detail-content h2 {
        font-size: var(--sp-detail-h2-size);
        margin: 48px 0 20px;
        padding-bottom: 8px;
    }
    
    .column-detail-content h3 {
        font-size: var(--sp-detail-h3-size);
        margin: 32px 0 16px;
        padding: 12px 16px;
    }
    
    .column-detail-content h4 {
        font-size: var(--sp-detail-h4-size);
        margin: 24px 0 12px;
    }
    
    .column-detail-content p {
        margin-bottom: 20px;
        line-height: 1.7;
    }
    
    .column-back-btn-wrap {
        margin-top: 50px;
    }
    
    .column-back-btn {
        width: var(--sp-detail-back-btn-width);
        min-width: var(--sp-detail-back-btn-min-width);
        height: var(--sp-detail-back-btn-height);
        padding: var(--sp-detail-back-btn-padding);
        font-size: var(--sp-detail-back-btn-size);
        max-width: 90%;
    }
    
    .sp-br {
        display: block;
    }
    .pc-br {
        display: none;
    }
}

/* Typography Utilities */
.sp-br {
    display: none;
}
.pc-br {
    display: block;
}