@charset "UTF-8";

:root {
    /* K-BDS Brand Colors */
    --kbds-primary: #0a5cad;       /* K-BDS deep blue */
    --kbds-primary-dark: #084a8c;
    --kbds-primary-light: #2b7cc9;
    --kbds-accent: #00b4d8;        /* cyan accent */
    --kbds-accent-soft: #e6f4f9;

    /* Neutrals */
    --bg-base: #f5f7fa;
    --bg-paper: #ffffff;
    --bg-soft: #f0f4f8;

    --ink: #1a2332;
    --ink-soft: #4a5568;
    --ink-mute: #8a94a6;

    /* Category accents (for cards) */
    --c-blue: #0a5cad;
    --c-blue-soft: #e7eff8;
    --c-teal: #0891b2;
    --c-teal-soft: #e0f2f7;
    --c-violet: #6366f1;
    --c-violet-soft: #eaecfd;
    --c-amber: #d97706;
    --c-amber-soft: #fdf1df;

    /* Lines & shadows */
    --line: #e2e8f0;
    --line-soft: #edf1f6;
    --shadow-sm: 0 1px 0.25rem rgba(15, 30, 60, 0.04);
    --shadow-md: 0 0.5rem 1.5rem rgba(15, 30, 60, 0.07);
    --shadow-lg: 0 1rem 3.1579rem rgba(15, 30, 60, 0.10);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== Page Header (KBDS sub-page style) ===== */
.user-manual-header {
    /* crisp diagonal blue → cyan flow */
    background:
            linear-gradient(115deg,
            var(--kbds-primary-dark) 0%,
            var(--kbds-primary) 38%,
            var(--kbds-primary-light) 68%,
            #1996d6 92%,
            var(--kbds-accent) 118%);
    color: white;
    padding: 4rem 7.5rem 8rem;
    position: relative;
    overflow: hidden;
    border-radius: 1rem;
}
/* crisp angled light band for a sleek "shine" */
.user-manual-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
            linear-gradient(118deg, transparent 0%, transparent 58%, rgba(255, 255, 255, 0.07) 60%, rgba(255, 255, 255, 0.07) 64%, transparent 66%, transparent 100%),
            linear-gradient(118deg, transparent 0%, transparent 72%, rgba(255, 255, 255, 0.05) 74%, rgba(255, 255, 255, 0.05) 76%, transparent 78%, transparent 100%);
    pointer-events: none;
}
/* subtle dot-grid texture (crisp, not blurry) */
.user-manual-header::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.10) 1px, transparent 0.1474rem);
    background-size: 2.325rem 2.325rem;
    mask-image: linear-gradient(115deg, transparent 0%, transparent 55%, black 100%);
    -webkit-mask-image: linear-gradient(115deg, transparent 0%, transparent 55%, black 100%);
    pointer-events: none;
}
.user-manual-header-inner {
    max-width: 124rem;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.user-manual-title {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
}
.user-manual-title .badge {
    display: inline-block;
    font-size: 1.25rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 10rem;
    margin-right: 1.25rem;
    vertical-align: middle;
    letter-spacing: 0.02em;
}
.user-manual-subtitle {
    font-size: 2rem;
    color: rgba(255, 255, 255, 0.85);
}

/* ===== user-manual-container ===== */
.user-manual-container {
    max-width: 124rem;
    margin: -4rem auto 0;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
}

/* ===== Quick Start Band ===== */
.manual-quick-start {
    background: var(--bg-paper);
    border: 1px solid var(--line);
    border-radius: 1rem;
    padding: 2.25rem 3rem;
    margin-bottom: 5.0526rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2.5rem;
    box-shadow: var(--shadow-md);
}
.manual-quick-start-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
.manual-quick-start-icon {
    width: 4.5rem; height: 4.5rem;
    background: var(--kbds-primary);
    border-radius: 1rem;
    display: flex; align-items: center; justify-content: center;
    color: white;
    flex-shrink: 0;
}
.manual-quick-start-text h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 0.25rem;
    letter-spacing: -0.01em;
}
.manual-quick-start-text p {
    font-size: 1.5rem;
    color: var(--ink-soft);
}
.manual-quick-start-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}
.manual-quick-start-link {
    padding: 1rem 1.5rem;
    background: var(--bg-soft);
    color: var(--kbds-primary);
    font-size: 1.5rem;
    font-weight: 600;
    border: 1px solid var(--line);
    border-radius: 0.8421rem;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-flex; align-items: center; gap: 0.6316rem;
    white-space: nowrap;
}
.manual-quick-start-link:hover {
    background: var(--kbds-primary);
    border-color: var(--kbds-primary);
    color: white;
}
.manual-quick-start-link .arrow { transition: transform 0.2s; font-size: 1.5rem; }
.manual-quick-start-link:hover .arrow { transform: translateX(0.3158rem); }

/* ===== Section ===== */
.manual-section { margin-bottom: 5.8947rem; }
.manual-section-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--kbds-primary);
}
.manual-section-num {
    font-size: 1.6rem;
    font-weight: 700;
    color: white;
    background: var(--kbds-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.6316rem;
    letter-spacing: 0.04em;
}
.manual-section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.02em;
}
.manual-section-title-en {
    font-size: 1.6rem;
    color: var(--ink-mute);
    font-weight: 500;
    margin-left: 0.5rem;
}

/* ===== Cards ===== */
.manual-cards { display: grid; gap: 1.8947rem; }
.manual-cards.two-col { grid-template-columns: 1fr 1fr; }
.manual-cards.three-col { grid-template-columns: repeat(3, 1fr); }
.manual-cards.appendix { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }

.manual-card {
    background: var(--bg-paper);
    border: 1px solid var(--line);
    border-radius: 1.25rem;
    padding: 2.825rem 2.5rem;
    transition: all 0.25s ease;
    position: relative;
    overflow: hidden;
}
.manual-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 0.3158rem;
    background: var(--kbds-primary);
    opacity: 0;
    transition: opacity 0.25s;
}
.manual-card:hover {
    transform: translateY(-0.3158rem);
    box-shadow: var(--shadow-lg);
    border-color: var(--kbds-primary-light);
}
.manual-card:hover::after { opacity: 1; }

.manual-card-header {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--line-soft);
}
.manual-card-icon {
    width: 4.5rem; height: 4.5rem;
    border-radius: 1rem;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.manual-card-icon.blue   { background: var(--c-blue-soft);   color: var(--c-blue); }
.manual-card-icon.teal   { background: var(--c-teal-soft);   color: var(--c-teal); }
.manual-card-icon.violet { background: var(--c-violet-soft); color: var(--c-violet); }
.manual-card-icon.amber  { background: var(--c-amber-soft);  color: var(--c-amber); }

.manual-card-title-group { flex: 1; min-width: 0; }
.manual-card-title {
    font-size: 1.825rem;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.01em;
    margin-bottom: 0.25rem;
}
.manual-card-title-en {
    font-size: 1.25rem;
    color: var(--ink-mute);
    font-weight: 500;
    letter-spacing: 0.02em;
}

.manual-card-list { list-style: none; }
.manual-card-list li > a {
    padding: 1.25rem 0;
    font-size: 1.6rem;
    color: var(--ink-soft);
    display: flex;
    align-items: center;
    gap: 1rem;
    border-top: 1px solid var(--line-soft);
    transition: all 0.18s;
    cursor: pointer;
}
.manual-card-list li:first-child > a { border-top: none; }
.manual-card-list li:hover > a { color: var(--kbds-primary); }
.manual-card-list .marker {
    width: 1.5rem; height: 1.5rem;
    flex-shrink: 0;
    color: var(--kbds-primary-light);
    transition: transform 0.18s;
}
.manual-card-list li:hover .marker {
    color: var(--kbds-primary);
    transform: translateX(0.25rem);
}
.manual-card-list .chevron {
    color: var(--kbds-primary);
    font-size: 1.5rem;
    margin-left: auto;
    opacity: 0;
    transition: all 0.2s;
}
.manual-card-list li:hover .chevron {
    opacity: 1;
    transform: translateX(0.3158rem);
}

/* ===== Appendix manual-cards ===== */
.manual-appendix-card {
    background: var(--bg-paper);
    border: 1px solid var(--line);
    border-left: 0.5rem solid var(--kbds-primary);
    border-radius: 1rem;
    padding: 2.25rem 2.5rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    cursor: pointer;
    transition: all 0.22s ease;
    text-decoration: none;
    color: var(--ink);
}
.manual-appendix-card:hover {
    transform: translateX(0.25rem);
    box-shadow: var(--shadow-md);
    border-left-color: var(--kbds-accent);
}
.manual-appendix-card .a-icon {
    width: 5rem; height: 5rem;
    border-radius: 1rem;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}
.manual-appendix-card .a-content { flex: 1; min-width: 0; }
.manual-appendix-card .a-label {
    font-size: 1.25rem;
    color: var(--ink-mute);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.manual-appendix-card .a-title {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--ink);
}
.manual-appendix-card .a-arrow {
    color: var(--kbds-primary);
    transition: transform 0.2s;
    font-size: 2rem;
}
.manual-appendix-card:hover .a-arrow { transform: translateX(0.5rem); }

/* ===== Footer note ===== */
.footer-note {
    text-align: center;
    margin-top: 6.825rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--line);
    color: var(--ink-mute);
    font-size: 1.25rem;
    letter-spacing: 0.04em;
}
.footer-note strong { color: var(--kbds-primary); font-weight: 700; }
.footer-note .dot { margin: 0 1rem; color: var(--line); }

/* ===== Animations ===== */
.animate {
    opacity: 0;
    transform: translateY(1.25rem);
    animation: rise 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes rise {
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
    .manual-cards.three-col { grid-template-columns: 1fr 1fr; }
    .user-manual-title { font-size: 3rem; }
}
@media (max-width: 768px) {
    .user-manual-header { padding: 4.5rem 3rem 5.5rem; }
    .user-manual-container { padding: 0 1.5rem; }
    .manual-quick-start {
        flex-direction: column;
        align-items: stretch;
        gap: 2rem;
        padding: 2rem;
    }

    .manual-quick-start-links { flex-direction: column; }
    .manual-quick-start-link { justify-content: space-between; }
    .manual-cards.two-col,
    .manual-cards.three-col,
    .manual-cards.appendix { grid-template-columns: 1fr; }
    .user-manual-title { font-size: 2.5rem; }
    .user-manual-title .badge { display: block; margin-bottom: 1rem; margin-right: 0; }
    .manual-section-title { font-size: 2rem; }
}