:root {
    --learning-bg: #08111f;
    --learning-panel: rgba(15, 27, 42, 0.82);
    --learning-panel-strong: rgba(13, 23, 38, 0.96);
    --learning-border: rgba(148, 163, 184, 0.24);
    --learning-ink: #f8fafc;
    --learning-muted: #9fb1c7;
}

.learning-page .page-shell {
    max-width: none;
    padding: 0;
}

.learning-landing {
    position: relative;
    min-height: 430px;
    display: grid;
    place-items: center;
    overflow: hidden;
    background:
        radial-gradient(circle at 18% 18%, rgba(1, 168, 141, 0.38), transparent 34%),
        radial-gradient(circle at 82% 20%, rgba(56, 189, 248, 0.28), transparent 30%),
        linear-gradient(135deg, #08111f 0%, #0f1b2a 52%, #0b1320 100%);
    color: var(--learning-ink);
    border-radius: 0 0 36px 36px;
}

.learning-orb {
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 999px;
    filter: blur(22px);
    opacity: 0.5;
}

.learning-orb-a { background: #01a88d; left: -120px; top: 40px; }
.learning-orb-b { background: #38bdf8; right: -120px; bottom: -80px; }

.learning-hero-card {
    position: relative;
    width: min(900px, calc(100vw - 36px));
    padding: 56px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 32px;
    background: rgba(8, 17, 31, 0.66);
    backdrop-filter: blur(22px);
    box-shadow: 0 30px 100px rgba(0, 0, 0, 0.36);
    text-align: center;
}

.learning-eyebrow,
.live-dot {
    color: #34d399;
    font-weight: 800;
    letter-spacing: 0.08em;
    font-size: 0.78rem;
}

.learning-hero-card h1 {
    margin: 14px 0;
    font-size: clamp(2.7rem, 6vw, 5.8rem);
    font-weight: 900;
    letter-spacing: -0.07em;
}

.learning-hero-card p {
    margin: 0 auto;
    max-width: 720px;
    color: var(--learning-muted);
    font-size: 1.1rem;
}

.learning-course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    width: min(1180px, calc(100vw - 36px));
    margin: -74px auto 80px;
    position: relative;
    z-index: 2;
}

.learning-course-card,
.learning-item-card,
.learning-content-card,
.learning-source-notice,
.learning-session-hero {
    border: 1px solid var(--learning-border);
    background: linear-gradient(160deg, rgba(15, 27, 42, 0.94), rgba(8, 17, 31, 0.78));
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(18px);
}

.learning-course-card {
    display: flex;
    flex-direction: column;
    min-height: 330px;
    padding: 28px;
    border-radius: 28px;
    color: var(--learning-ink);
    text-decoration: none;
    overflow: hidden;
    position: relative;
}

.learning-course-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 0%, color-mix(in srgb, var(--course-accent) 40%, transparent), transparent 42%);
    pointer-events: none;
}

.learning-card-top,
.learning-card-footer,
.learning-session-meta,
.learning-reader-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: space-between;
    color: var(--learning-muted);
    font-size: 0.92rem;
}

.learning-course-card h2 {
    position: relative;
    margin: 44px 0 12px;
    font-size: 2rem;
    font-weight: 850;
    letter-spacing: -0.04em;
}

.learning-course-card p {
    position: relative;
    color: var(--learning-muted);
}

.learning-meta-grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: auto 0 28px;
}

.learning-meta-grid span {
    padding: 12px 10px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.06);
    color: #dbeafe;
    text-align: center;
    font-size: 0.86rem;
}

.learning-card-footer strong {
    color: #ffffff;
    padding: 10px 18px;
    border-radius: 999px;
    background: var(--course-accent);
}

.learning-app {
    display: grid;
    grid-template-columns: 310px minmax(0, 1fr);
    min-height: calc(100vh - 82px);
    color: var(--learning-ink);
    background:
        radial-gradient(circle at 20% 10%, color-mix(in srgb, var(--course-accent) 26%, transparent), transparent 32%),
        linear-gradient(135deg, #08111f, #101a2b 52%, #0a101b);
}

.learning-sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 26px 18px;
    border-right: 1px solid var(--learning-border);
    background: rgba(8, 17, 31, 0.74);
    backdrop-filter: blur(22px);
    overflow-y: auto;
}

.learning-brand {
    display: block;
    padding: 14px 14px 20px;
    color: var(--learning-ink);
    text-decoration: none;
    font-weight: 900;
    letter-spacing: -0.03em;
}

.learning-brand small {
    display: block;
    margin-top: 4px;
    color: var(--learning-muted);
    font-weight: 700;
}

.learning-nav-list {
    display: grid;
    gap: 6px;
    align-content: start;
}

.learning-nav-home {
    display: block;
    color: #cbd5e1;
    text-decoration: none;
    padding: 11px 12px;
    border-radius: 14px;
    font-size: 0.94rem;
}

.learning-nav-home:hover,
.learning-nav-home.is-active {
    color: #ffffff;
    background: color-mix(in srgb, var(--course-accent) 20%, rgba(255,255,255,0.06));
}

.learning-nav-section > summary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: 14px;
    color: #cbd5e1;
    font-size: 0.92rem;
    cursor: pointer;
    list-style: none;
}

.learning-nav-section > summary::-webkit-details-marker {
    display: none;
}

.learning-nav-section > summary::before {
    content: "▸";
    flex: none;
    color: var(--learning-muted);
    transition: transform 140ms ease;
}

.learning-nav-section[open] > summary::before {
    transform: rotate(90deg);
}

.learning-nav-section > summary:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.06);
}

.learning-nav-section-title {
    flex: 1;
    min-width: 0;
}

.learning-nav-jump {
    flex: none;
    padding: 0 6px;
    border-radius: 8px;
    color: var(--learning-muted);
    text-decoration: none;
    opacity: 0;
}

.learning-nav-section > summary:hover .learning-nav-jump,
.learning-nav-jump:focus-visible {
    opacity: 1;
}

.learning-nav-items {
    display: grid;
    gap: 2px;
    margin: 2px 0 8px 14px;
    padding-left: 10px;
    border-left: 1px solid var(--learning-border);
}

.learning-nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 12px;
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.87rem;
    line-height: 1.35;
}

.learning-nav-item:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.06);
}

.learning-nav-item.is-current {
    color: #ffffff;
    font-weight: 700;
    background: color-mix(in srgb, var(--course-accent) 24%, rgba(255, 255, 255, 0.06));
}

.learning-nav-dot {
    flex: none;
    width: 6px;
    height: 6px;
    border-radius: 999px;
    background: var(--learning-muted);
}

.learning-dot-module { background: #34d399; }
.learning-dot-note { background: #60a5fa; }
.learning-dot-lab { background: #fbbf24; }

.learning-sidebar-toggle {
    display: none;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
    padding: 12px 14px;
    border: 1px solid var(--learning-border);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--learning-ink);
    font-weight: 700;
    cursor: pointer;
}

.learning-sidebar-toggle small {
    color: var(--learning-muted);
    font-weight: 600;
}

.learning-page a:focus-visible,
.learning-page button:focus-visible,
.learning-page input:focus-visible,
.learning-page summary:focus-visible {
    outline: 2px solid var(--course-accent, #38bdf8);
    outline-offset: 2px;
}

.learning-main-panel {
    padding: 34px;
    min-width: 0;
}

.learning-session-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 24px;
    padding: 34px;
    border-radius: 28px;
}

.learning-session-hero h1,
.learning-reader-hero h1 {
    margin: 10px 0;
    font-size: clamp(2rem, 4vw, 4rem);
    font-weight: 900;
    letter-spacing: -0.06em;
}

.learning-session-hero p,
.learning-reader-hero p,
.learning-section-head p,
.learning-item-card p,
.learning-content-card p,
.learning-source-notice span {
    color: var(--learning-muted);
}

.learning-session-meta {
    align-content: center;
    justify-content: end;
    max-width: 360px;
}

.learning-reader-meta {
    justify-content: flex-start;
    gap: 8px;
    margin-top: 8px;
}

.learning-session-meta span,
.learning-reader-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--learning-border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    font-size: 0.85rem;
}

.learning-source-notice {
    display: flex;
    gap: 14px;
    align-items: center;
    margin: 18px 0;
    padding: 16px 18px;
    border-radius: 18px;
}

.learning-source-notice a {
    margin-left: auto;
    color: #67e8f9;
    text-decoration: none;
    white-space: nowrap;
}

.learning-stats-strip {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 22px 0 28px;
}

.learning-stats-strip span {
    padding: 12px 16px;
    border-radius: 16px;
    color: #dbeafe;
    background: rgba(255, 255, 255, 0.07);
}

.learning-section {
    margin: 34px 0;
}

.learning-section-head {
    display: flex;
    gap: 18px;
    align-items: start;
    margin-bottom: 16px;
}

.learning-section-head > span {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: var(--course-accent);
    color: white;
    font-weight: 900;
}

.learning-section-head h2 {
    margin: 0 0 4px;
    font-size: 1.7rem;
    font-weight: 850;
}

.learning-item-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 14px;
}

.learning-item-card {
    display: block;
    padding: 20px;
    border-radius: 20px;
    color: var(--learning-ink);
    text-decoration: none;
    transition: transform 160ms ease, border-color 160ms ease;
}

.learning-item-card:hover {
    transform: translateY(-3px);
    border-color: color-mix(in srgb, var(--course-accent) 70%, white 10%);
}

.learning-item-type {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--course-accent) 22%, rgba(255,255,255,0.08));
    color: #d1fae5;
    font-size: 0.76rem;
    font-weight: 900;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.learning-item-card h3 {
    margin: 14px 0 8px;
    font-size: 1.1rem;
    font-weight: 800;
}

.learning-item-card small {
    color: #67e8f9;
}

.learning-breadcrumb {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    color: var(--learning-muted);
    margin-bottom: 22px;
}

.learning-breadcrumb a {
    color: #67e8f9;
    text-decoration: none;
}

.learning-reader-hero {
    padding: 34px 0 22px;
    border-bottom: 1px solid var(--learning-border);
}

.learning-content-card {
    margin-top: 24px;
    padding: 30px;
    border-radius: 24px;
    font-size: 1.05rem;
    line-height: 1.75;
}

.learning-content-card h2,
.learning-content-card h3 {
    font-weight: 850;
    letter-spacing: -0.03em;
}

.learning-content-subtitle {
    font-size: 1.12rem;
    color: #bae6fd !important;
}

.learning-content-headline {
    font-size: 1.35rem;
    font-weight: 850;
    color: #ffffff !important;
}

.learning-slide-list {
    display: grid;
    gap: 18px;
    margin-top: 28px;
}

.learning-slide-card {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 18px;
    padding: 22px;
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.045);
}

.learning-slide-number {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 13px;
    background: var(--course-accent);
    color: #fff;
    font-weight: 900;
}

.learning-slide-card h3 {
    margin: 0 0 10px;
    font-size: 1.25rem;
}

.learning-slide-card p {
    margin: 0 0 10px;
    word-break: keep-all;
}

.learning-callout {
    margin: 24px 0;
    padding: 20px;
    border-radius: 18px;
    border: 1px solid color-mix(in srgb, var(--course-accent) 42%, transparent);
    background: color-mix(in srgb, var(--course-accent) 12%, rgba(255,255,255,0.04));
}

.learning-empty {
    padding: 30px;
    border-radius: 24px;
    background: rgba(255,255,255,0.08);
}

/* === 검색 / 유형 필터 === */
.learning-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin: 0 0 28px;
}

.learning-search {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1 1 260px;
    max-width: 380px;
    padding: 10px 16px;
    border: 1px solid var(--learning-border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.07);
}

.learning-search input {
    flex: 1;
    min-width: 0;
    border: 0;
    background: transparent;
    color: var(--learning-ink);
    font-size: 0.95rem;
}

.learning-search input::placeholder {
    color: var(--learning-muted);
}

.learning-search input:focus {
    outline: none;
}

.learning-filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.learning-chip {
    padding: 9px 16px;
    border: 1px solid var(--learning-border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--learning-muted);
    font-size: 0.86rem;
    font-weight: 700;
    cursor: pointer;
    transition: color 140ms ease, background 140ms ease, border-color 140ms ease;
}

.learning-chip:hover {
    color: var(--learning-ink);
}

.learning-chip.is-active {
    color: #ffffff;
    background: color-mix(in srgb, var(--course-accent) 34%, transparent);
    border-color: color-mix(in srgb, var(--course-accent) 60%, transparent);
}

.learning-filter-count {
    color: var(--learning-muted);
    font-size: 0.88rem;
}

.learning-section.is-filtered-out .learning-section-head {
    opacity: 0.4;
}

.learning-section-empty {
    margin: 0;
    padding: 16px 18px;
    border: 1px dashed var(--learning-border);
    border-radius: 16px;
    color: var(--learning-muted);
    font-size: 0.9rem;
}

/* === 이전 / 다음 항목 === */
.learning-pager {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 28px 0 18px;
}

.learning-pager-link {
    display: grid;
    gap: 6px;
    padding: 18px 20px;
    border: 1px solid var(--learning-border);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.045);
    color: var(--learning-ink);
    text-decoration: none;
    transition: transform 160ms ease, border-color 160ms ease;
}

.learning-pager-link small {
    color: var(--learning-muted);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
}

.learning-pager-link strong {
    font-size: 1.02rem;
    font-weight: 800;
    line-height: 1.35;
}

a.learning-pager-link:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--course-accent) 70%, white 10%);
}

.learning-pager-next {
    text-align: right;
}

.learning-pager-link.is-disabled {
    opacity: 0.45;
}

.learning-pager-link.is-disabled strong {
    color: var(--learning-muted);
    font-weight: 700;
}

@media (max-width: 980px) {
    .learning-app {
        grid-template-columns: 1fr;
    }

    /* 모바일에서는 목차가 본문을 밀어내지 않도록 접어 둔다. */
    .learning-sidebar {
        position: sticky;
        top: 0;
        z-index: 5;
        height: auto;
        max-height: 100vh;
        padding: 16px 14px;
        border-right: 0;
        border-bottom: 1px solid var(--learning-border);
    }

    .learning-brand {
        padding: 4px 4px 12px;
    }

    .learning-sidebar-toggle {
        display: flex;
    }

    .learning-nav-list {
        display: none;
        max-height: 60vh;
        overflow-y: auto;
    }

    .learning-nav-list.is-open {
        display: grid;
    }

    .learning-session-hero {
        grid-template-columns: 1fr;
    }

    .learning-session-meta {
        justify-content: start;
        max-width: none;
    }
}

@media (max-width: 640px) {
    .learning-hero-card {
        padding: 36px 24px;
    }

    .learning-main-panel {
        padding: 20px;
    }

    .learning-meta-grid {
        grid-template-columns: 1fr;
    }

    .learning-source-notice {
        display: grid;
    }

    .learning-source-notice a {
        margin-left: 0;
    }

    .learning-filter-bar {
        gap: 10px;
    }

    .learning-search {
        max-width: none;
    }

    .learning-pager {
        grid-template-columns: 1fr;
    }

    .learning-pager-next {
        text-align: left;
    }
}

/* === 덱 슬라이드 렌더러 (learning/_blocks.html) === */
.learning-deck-intro { margin-bottom: 4px; }
.learning-deck-closing { margin-top: 20px; }
.learning-deck-closing strong { font-size: 1.15rem; font-weight: 850; }
.learning-deck-closing p { margin: 8px 0 0; color: var(--learning-muted); }

.deck-stream {
    display: grid;
    gap: 18px;
    margin-top: 24px;
}

.hl { color: var(--course-accent); font-weight: 750; }

.deck-slide {
    padding: 28px 30px;
    border: 1px solid var(--learning-border);
    border-radius: 20px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.022));
    box-shadow: 0 10px 34px rgba(0, 0, 0, 0.18);
    word-break: keep-all;
}
.deck-slide-lab { border-left: 3px solid var(--course-accent); }
.deck-slide :is(p, li) { word-break: keep-all; }
.deck-slide ul, .deck-slide ol { margin: 8px 0; padding-left: 20px; }
.deck-slide li { margin: 4px 0; }
.deck-slide :not(pre) > code {
    background: rgba(255, 255, 255, 0.09);
    padding: 1px 6px;
    border-radius: 6px;
    font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
    font-size: 0.88em;
    color: #e8eef6;
}

.deck-eyebrow {
    display: inline-block;
    margin-bottom: 8px;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--course-accent);
}
.deck-slide-title { margin: 0 0 8px; font-size: 1.3rem; font-weight: 850; letter-spacing: -0.02em; }
.deck-lede { margin: 0 0 14px; font-size: 1.05rem; color: #cdd9ea; }

/* 파트 구분 슬라이드 (type=section) */
.deck-part {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 34px 32px;
    border: 1px solid color-mix(in srgb, var(--course-accent) 42%, transparent);
    border-left: 4px solid var(--course-accent);
    border-radius: 24px;
    box-shadow: 0 14px 44px rgba(0, 0, 0, 0.24);
    background:
        radial-gradient(circle at 12% 0%, color-mix(in srgb, var(--course-accent) 32%, transparent), transparent 58%),
        var(--learning-panel-strong);
}
.deck-part-icon { font-size: 1.9rem; line-height: 1; }
.deck-part h2 { margin: 0; font-size: 1.55rem; font-weight: 850; letter-spacing: -0.03em; }
.deck-part p { margin: 0; color: #cdd9ea; }

/* lab 메타 */
.deck-lab-meta { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 10px; color: var(--course-accent); font-weight: 700; font-size: 0.9rem; }
.deck-lab-desc { color: #cdd9ea; }
.deck-objectives { margin: 14px 0; padding: 14px 16px; border: 1px dashed color-mix(in srgb, var(--course-accent) 50%, transparent); border-radius: 14px; }
.deck-objectives h4 { margin: 0 0 8px; font-size: 0.95rem; color: var(--course-accent); }

/* heading / html */
.deck-heading { margin: 18px 0 6px; font-size: 1.1rem; font-weight: 800; }
.deck-html { color: #dbe5f1; }
.deck-html p { margin: 0 0 10px; }

/* callout */
.deck-callout {
    margin: 14px 0;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid color-mix(in srgb, var(--course-accent) 40%, transparent);
    background: color-mix(in srgb, var(--course-accent) 12%, rgba(255, 255, 255, 0.04));
}
.deck-callout strong { display: block; margin-bottom: 4px; }
.deck-callout p { margin: 0; color: #dbe5f1; }
.deck-callout-tag { float: right; font-size: 0.7rem; padding: 2px 8px; border-radius: 999px; background: rgba(255, 255, 255, 0.12); }
.deck-tone-warn { border-color: rgba(251, 191, 36, 0.5); background: rgba(251, 191, 36, 0.12); }
.deck-tone-danger { border-color: rgba(248, 113, 113, 0.5); background: rgba(248, 113, 113, 0.12); }
.deck-tone-success { border-color: rgba(52, 211, 153, 0.5); background: rgba(52, 211, 153, 0.12); }

/* spotlight */
.deck-spotlight { display: flex; gap: 14px; align-items: flex-start; margin: 14px 0; padding: 18px; border-radius: 16px; background: color-mix(in srgb, var(--course-accent) 14%, rgba(255, 255, 255, 0.03)); }
.deck-spotlight-icon { font-size: 1.8rem; line-height: 1; }
.deck-spotlight h3 { margin: 0 0 4px; font-size: 1.1rem; }
.deck-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 0; padding: 0; list-style: none; }
.deck-chips li { padding: 3px 10px; border-radius: 999px; background: rgba(255, 255, 255, 0.08); border: 1px solid var(--learning-border); font-size: 0.8rem; }

/* code */
.deck-code { margin: 14px 0; border: 1px solid var(--learning-border); border-radius: 14px; overflow: hidden; background: #0b1220; }
.deck-code figcaption { padding: 6px 14px; font-family: ui-monospace, monospace; font-size: 0.75rem; color: var(--course-accent); background: rgba(255, 255, 255, 0.04); border-bottom: 1px solid var(--learning-border); }
.deck-code pre { margin: 0; padding: 16px; overflow-x: auto; }
.deck-code code { font-family: ui-monospace, "SFMono-Regular", Menlo, monospace; font-size: 0.86rem; line-height: 1.6; color: #e2e8f0; white-space: pre; }
.deck-code-notes { margin: 0; padding: 10px 16px; border-top: 1px solid var(--learning-border); color: var(--learning-muted); font-size: 0.85rem; }

/* table */
.deck-table-wrap { margin: 14px 0; overflow-x: auto; }
.deck-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.deck-table th, .deck-table td { padding: 9px 12px; border: 1px solid var(--learning-border); text-align: left; vertical-align: top; }
.deck-table th { background: color-mix(in srgb, var(--course-accent) 22%, rgba(255, 255, 255, 0.04)); font-weight: 750; }
.deck-table tbody tr:nth-child(even) { background: rgba(255, 255, 255, 0.03); }

/* cards / options / cols / layers */
.deck-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin: 14px 0; }
.deck-card { padding: 16px; border: 1px solid var(--learning-border); border-top: 3px solid var(--card-accent, var(--course-accent)); border-radius: 14px; background: rgba(255, 255, 255, 0.04); }
.deck-card h4 { margin: 0 0 8px; font-size: 1rem; }
.deck-card ul { margin: 8px 0 0; }
.deck-card-sub { margin: 0; color: var(--learning-muted); font-size: 0.88rem; }
.deck-card-when { margin: 8px 0 0; font-size: 0.85rem; color: var(--course-accent); }
.deck-card.is-recommended { border-color: var(--course-accent); box-shadow: inset 0 0 0 1px var(--course-accent); }
.deck-badge { font-size: 0.68rem; padding: 2px 8px; border-radius: 999px; background: var(--course-accent); color: #08111f; font-weight: 800; vertical-align: middle; }

/* kvList */
.deck-kv { display: grid; gap: 0; margin: 14px 0; }
.deck-kv > div { display: grid; grid-template-columns: minmax(120px, 0.4fr) 1fr; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--learning-border); }
.deck-kv dt { margin: 0; font-weight: 750; }
.deck-kv dd { margin: 0; color: #dbe5f1; }

/* steps / flow */
.deck-steps { list-style: none; margin: 14px 0; padding: 0; display: grid; gap: 12px; }
.deck-steps > li { display: grid; grid-template-columns: 32px 1fr; gap: 14px; align-items: start; }
.deck-step-no { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 9px; background: var(--course-accent); color: #08111f; font-weight: 900; font-size: 0.85rem; }
.deck-steps strong { display: block; }

/* compare */
.deck-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
.deck-compare-side { padding: 16px; border: 1px solid var(--learning-border); border-radius: 14px; background: rgba(255, 255, 255, 0.04); }
.deck-compare-side h4 { margin: 0 0 8px; }

/* shifts (before → after) */
.deck-shifts { display: grid; gap: 8px; margin: 14px 0; }
.deck-shift-head { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding: 0 14px; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--learning-muted); }
.deck-shift { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 10px 14px; border: 1px solid var(--learning-border); border-left: 3px solid var(--card-accent, var(--course-accent)); border-radius: 12px; background: rgba(255, 255, 255, 0.04); }
.deck-shift-label { flex: 0 0 100%; font-weight: 700; font-size: 0.85rem; }
.deck-shift-from { flex: 1; color: var(--learning-muted); }
.deck-shift-arrow { color: var(--course-accent); font-weight: 800; }
.deck-shift-to { flex: 1; font-weight: 700; }

/* stats */
.deck-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; margin: 14px 0; }
.deck-stat { padding: 16px; border-radius: 14px; text-align: center; background: color-mix(in srgb, var(--course-accent) 14%, rgba(255, 255, 255, 0.03)); }
.deck-stat strong { display: block; font-size: 1.6rem; font-weight: 850; color: var(--course-accent); }
.deck-stat span { color: var(--learning-muted); font-size: 0.85rem; }

/* timeline */
.deck-timeline { list-style: none; margin: 14px 0; padding-left: 20px; border-left: 2px solid var(--learning-border); display: grid; gap: 14px; }
.deck-timeline li { position: relative; }
.deck-timeline li::before { content: ""; position: absolute; left: -26px; top: 6px; width: 9px; height: 9px; border-radius: 50%; background: var(--course-accent); }
.deck-timeline strong { display: block; }
.deck-timeline p { margin: 4px 0 0; color: #dbe5f1; }

/* tabs */
.deck-tabs { display: grid; gap: 8px; margin: 14px 0; }
.deck-tab { padding: 0 14px; border: 1px solid var(--learning-border); border-radius: 12px; background: rgba(255, 255, 255, 0.03); }
.deck-tab summary { padding: 12px 0; cursor: pointer; font-weight: 700; }
.deck-tab[open] summary { color: var(--course-accent); }
.deck-tab ul { margin: 0 0 12px; }

/* quote */
.deck-quote { margin: 14px 0; padding: 14px 18px; border-left: 3px solid var(--course-accent); border-radius: 0 12px 12px 0; background: rgba(255, 255, 255, 0.04); font-style: italic; color: #dbe5f1; }

/* 발표자 노트 */
.deck-speech { margin-top: 16px; padding-top: 10px; border-top: 1px dashed var(--learning-border); }
.deck-speech summary { cursor: pointer; font-size: 0.82rem; font-weight: 700; color: var(--learning-muted); }
.deck-speech p { margin: 8px 0 0; color: var(--learning-muted); font-size: 0.9rem; }

@media (max-width: 720px) {
    .deck-slide { padding: 20px 18px; }
    .deck-compare { grid-template-columns: 1fr; }
    .deck-kv > div { grid-template-columns: 1fr; gap: 2px; }
}