:root {
    --guide-bg: #0d0f12;
    --guide-surface: #15181d;
    --guide-surface-raised: #1b1f25;
    --guide-border: #2a3038;
    --guide-border-soft: #20252c;
    --guide-text: #f4f6f8;
    --guide-muted: #9ca5b1;
    --guide-blue: #5b8def;
    --guide-blue-soft: rgba(91, 141, 239, 0.12);
    --guide-width: 1320px;
}

html {
    scroll-behavior: smooth;
}

.guide-body {
    min-height: 100vh;
    margin: 0;
    background: var(--guide-bg);
    color: var(--guide-text);
    font-family: Inter, Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    letter-spacing: 0;
}

.guide-body *,
.guide-body *::before,
.guide-body *::after {
    box-sizing: border-box;
}

.guide-body a {
    color: inherit;
    text-decoration: none;
}

.guide-header {
    position: sticky;
    z-index: 30;
    top: 0;
    border-bottom: 1px solid var(--guide-border-soft);
    background: rgba(13, 15, 18, 0.94);
    backdrop-filter: blur(14px);
}

.guide-header-inner {
    width: min(calc(100% - 48px), var(--guide-width));
    height: 68px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 34px;
}

.guide-brand {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 17px;
    font-weight: 800;
}

.guide-brand img {
    display: block;
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.guide-primary-nav {
    display: flex;
    align-items: center;
    gap: 26px;
    margin-right: auto;
    font-size: 14px;
    color: var(--guide-muted);
}

.guide-primary-nav a,
.guide-login {
    transition: color 160ms ease;
}

.guide-primary-nav a:hover,
.guide-primary-nav .is-active,
.guide-login:hover {
    color: var(--guide-text);
}

.guide-header-actions {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 14px;
}

.guide-language-menu {
    position: relative;
    color: var(--guide-muted);
}

.guide-language-menu summary {
    min-width: 84px;
    cursor: pointer;
    list-style: none;
}

.guide-language-menu summary::after {
    content: "⌄";
    margin-left: 7px;
}

.guide-language-menu summary::-webkit-details-marker {
    display: none;
}

.guide-language-options {
    position: absolute;
    top: 34px;
    right: 0;
    width: 150px;
    padding: 7px;
    border: 1px solid var(--guide-border);
    border-radius: 7px;
    background: var(--guide-surface-raised);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

.guide-language-options a {
    display: block;
    padding: 9px 10px;
    border-radius: 5px;
}

.guide-language-options a:hover,
.guide-language-options .is-active {
    color: var(--guide-text);
    background: #242a32;
}

.guide-start {
    padding: 9px 14px;
    border-radius: 6px;
    background: var(--guide-blue);
    color: #fff;
    font-weight: 700;
}

.guide-mobile-menu,
.guide-mobile-navigation {
    display: none;
}

.guide-shell {
    display: grid;
    grid-template-columns: 246px minmax(0, 760px) 210px;
    gap: 54px;
    width: min(calc(100% - 48px), var(--guide-width));
    min-height: calc(100vh - 68px);
    margin: 0 auto;
}

.guide-sidebar {
    padding: 40px 0 64px;
    border-right: 1px solid var(--guide-border-soft);
}

.guide-navigation {
    position: sticky;
    top: 108px;
    width: 214px;
}

.guide-search {
    height: 40px;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 22px;
    padding: 0 11px;
    border: 1px solid var(--guide-border);
    border-radius: 6px;
    background: var(--guide-surface);
    color: var(--guide-muted);
}

.guide-search input {
    width: 100%;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--guide-text);
    font: inherit;
    font-size: 13px;
}

.guide-search input::placeholder {
    color: #717a86;
}

.guide-home-link,
.guide-nav-chapter,
.guide-nav-article {
    display: block;
    border-radius: 5px;
    color: var(--guide-muted);
}

.guide-home-link,
.guide-nav-chapter {
    padding: 8px 10px;
    font-size: 14px;
    font-weight: 650;
}

.guide-home-link {
    margin-bottom: 8px;
}

.guide-nav-section {
    margin-bottom: 3px;
}

.guide-nav-article {
    margin: 1px 0 5px 10px;
    padding: 7px 10px 7px 15px;
    border-left: 1px solid var(--guide-border);
    border-radius: 0;
    font-size: 13px;
    line-height: 1.45;
}

.guide-home-link:hover,
.guide-nav-chapter:hover,
.guide-nav-article:hover,
.guide-home-link.is-active,
.guide-nav-chapter.is-active,
.guide-nav-article.is-active {
    color: var(--guide-text);
}

.guide-home-link.is-active,
.guide-nav-chapter.is-active {
    background: var(--guide-blue-soft);
}

.guide-nav-article.is-active {
    border-color: var(--guide-blue);
    color: #8db0f5;
}

.guide-nav-article.is-planned {
    color: #626b76;
}

.guide-nav-empty {
    padding: 10px;
    color: var(--guide-muted);
    font-size: 13px;
}

.guide-content {
    min-width: 0;
    padding: 66px 0 100px;
}

.guide-toc {
    padding: 70px 0 64px;
}

.guide-toc-inner {
    position: sticky;
    top: 110px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-left: 18px;
    border-left: 1px solid var(--guide-border);
}

.guide-toc-inner strong {
    margin-bottom: 4px;
    font-size: 12px;
    color: var(--guide-text);
    text-transform: uppercase;
}

.guide-toc-inner a {
    color: var(--guide-muted);
    font-size: 13px;
    line-height: 1.45;
}

.guide-toc-inner a:hover {
    color: var(--guide-blue);
}

.guide-eyebrow {
    margin: 0 0 18px;
    color: var(--guide-blue);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}

.guide-hub h1,
.guide-article h1 {
    margin: 0;
    max-width: 720px;
    font-size: 44px;
    line-height: 1.15;
    letter-spacing: 0;
}

.guide-lead {
    max-width: 680px;
    margin: 20px 0 0;
    color: var(--guide-muted);
    font-size: 18px;
    line-height: 1.75;
}

.guide-featured {
    display: grid;
    grid-template-columns: 44px 1fr auto;
    align-items: center;
    gap: 18px;
    margin: 44px 0 62px;
    padding: 22px;
    border: 1px solid #365c9f;
    border-radius: 7px;
    background: var(--guide-blue-soft);
    transition: border-color 160ms ease, background 160ms ease;
}

.guide-featured:hover {
    border-color: var(--guide-blue);
    background: rgba(91, 141, 239, 0.17);
}

.guide-featured-mark,
.guide-chapter-index {
    color: var(--guide-blue);
    font-size: 12px;
    font-weight: 800;
}

.guide-featured strong,
.guide-featured small {
    display: block;
}

.guide-featured strong {
    margin-bottom: 5px;
    font-size: 16px;
}

.guide-featured small {
    color: var(--guide-muted);
    line-height: 1.5;
}

.guide-arrow {
    color: var(--guide-blue);
    font-size: 22px;
}

.guide-hub h2 {
    margin: 0 0 18px;
    font-size: 20px;
}

.guide-chapter-list {
    border-top: 1px solid var(--guide-border);
}

.guide-chapter-row {
    padding: 30px 8px;
    border-bottom: 1px solid var(--guide-border-soft);
    scroll-margin-top: 100px;
}

.guide-chapter-header {
    display: grid;
    grid-template-columns: 44px 1fr;
    align-items: start;
    gap: 16px;
}

.guide-chapter-row h3 {
    margin: 0 0 5px;
    font-size: 16px;
}

.guide-chapter-row p {
    margin: 0;
    color: var(--guide-muted);
    font-size: 14px;
    line-height: 1.55;
}

.guide-article-list {
    display: grid;
    gap: 0;
    margin: 20px 0 0 60px;
    padding: 0;
    list-style: none;
}

.guide-article-list li {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 14px;
    min-height: 48px;
    border-top: 1px solid var(--guide-border-soft);
}

.guide-article-list li > a,
.guide-planned-article {
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 0;
    font-size: 14px;
    line-height: 1.55;
}

.guide-article-list li > a:hover {
    color: var(--guide-blue);
}

.guide-article-arrow {
    color: var(--guide-blue);
}

.guide-planned-article {
    color: #8a939f;
}

.guide-planned-article small {
    flex: 0 0 auto;
    color: #626b76;
    font-size: 10px;
}

.guide-priority {
    min-width: 54px;
    padding: 4px 7px;
    border: 1px solid var(--guide-border);
    border-radius: 4px;
    color: var(--guide-muted);
    font-size: 10px;
    text-align: center;
}

.guide-priority-core {
    border-color: rgba(91, 141, 239, 0.45);
    color: #8db0f5;
}

.guide-priority-advanced {
    color: #7d8691;
}

.guide-breadcrumb {
    display: flex;
    gap: 8px;
    margin-bottom: 27px;
    color: var(--guide-muted);
    font-size: 13px;
}

.guide-breadcrumb a:hover {
    color: var(--guide-blue);
}

.guide-article-meta {
    display: flex;
    gap: 10px 20px;
    margin-top: 22px;
    color: #747e89;
    font-size: 12px;
}

.guide-outline {
    margin: 40px 0 50px;
    padding: 20px 22px;
    border-left: 3px solid var(--guide-blue);
    background: var(--guide-blue-soft);
}

.guide-outline strong {
    font-size: 14px;
}

.guide-outline ol {
    margin: 13px 0 0;
    padding-left: 20px;
    color: var(--guide-muted);
    font-size: 14px;
    line-height: 1.8;
}

.guide-article-section {
    margin-bottom: 56px;
    scroll-margin-top: 100px;
}

.guide-article-section h2 {
    margin: 0 0 17px;
    font-size: 24px;
    line-height: 1.35;
}

.guide-article-section p {
    margin: 0 0 15px;
    color: #c1c7cf;
    font-size: 16px;
    line-height: 1.85;
}

.guide-screenshot {
    margin: 28px 0 0;
    padding: 24px;
    border: 1px solid var(--guide-border);
    border-radius: 7px;
    background: var(--guide-surface);
}

.guide-screenshot img {
    display: block;
    width: min(100%, 560px);
    max-height: 520px;
    margin: 0 auto;
    object-fit: contain;
}

.guide-screenshot__trigger {
    display: block;
    width: 100%;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: zoom-in;
}

.guide-screenshot__trigger:focus-visible {
    outline: 3px solid #ccff00;
    outline-offset: 5px;
}

.guide-screenshot figcaption {
    margin-top: 16px;
    color: var(--guide-muted);
    font-size: 12px;
    line-height: 1.6;
    text-align: center;
}

body.guide-image-viewer-open {
    overflow: hidden;
}

.guide-image-viewer {
    width: 100vw;
    max-width: none;
    height: 100dvh;
    max-height: none;
    margin: 0;
    padding: 0;
    border: 0;
    background: rgba(7, 8, 10, 0.96);
    color: #fff;
}

.guide-image-viewer::backdrop {
    background: rgba(7, 8, 10, 0.96);
}

.guide-image-viewer[open] {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
}

.guide-image-viewer__toolbar {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    padding: max(12px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 12px max(16px, env(safe-area-inset-left));
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(7, 8, 10, 0.88);
}

.guide-image-viewer__zoom-controls {
    display: flex;
    align-items: center;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 6px;
}

.guide-image-viewer__toolbar button {
    display: grid;
    min-width: 44px;
    min-height: 44px;
    place-items: center;
    padding: 0 12px;
    border: 0;
    border-right: 1px solid rgba(255, 255, 255, 0.18);
    background: transparent;
    color: #fff;
    font: inherit;
    cursor: pointer;
}

.guide-image-viewer__toolbar button:last-child {
    border-right: 0;
}

.guide-image-viewer__toolbar button:focus-visible {
    outline: 2px solid #ccff00;
    outline-offset: -3px;
}

.guide-image-viewer__zoom-controls [data-guide-image-zoom-reset] {
    min-width: 70px;
    color: #c1c7cf;
    font-size: 13px;
    font-variant-numeric: tabular-nums;
}

.guide-image-viewer__close {
    border: 1px solid rgba(255, 255, 255, 0.22) !important;
    border-radius: 50%;
    font-size: 28px !important;
    line-height: 1;
}

.guide-image-viewer__stage {
    display: grid;
    min-width: 0;
    min-height: 0;
    overflow: hidden;
    place-items: center;
    padding: 20px;
    cursor: default;
    touch-action: none;
}

.guide-image-viewer__stage.is-zoomed {
    cursor: grab;
}

.guide-image-viewer__stage.is-dragging {
    cursor: grabbing;
}

.guide-image-viewer__stage img {
    display: block;
    width: auto;
    max-width: min(1206px, calc(100vw - 40px));
    height: auto;
    max-height: calc(100dvh - 105px);
    transform: translate3d(var(--guide-image-x, 0), var(--guide-image-y, 0), 0) scale(var(--guide-image-scale, 1));
    transform-origin: center;
    user-select: none;
    -webkit-user-drag: none;
    will-change: transform;
}

.guide-feedback {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-top: 72px;
    padding: 24px 0;
    border-top: 1px solid var(--guide-border);
    border-bottom: 1px solid var(--guide-border);
    font-size: 14px;
}

.guide-feedback div {
    display: flex;
    gap: 8px;
}

.guide-feedback button {
    min-width: 64px;
    min-height: 38px;
    border: 1px solid var(--guide-border);
    border-radius: 6px;
    background: var(--guide-surface);
    color: var(--guide-text);
    cursor: pointer;
}

.guide-feedback button:hover {
    border-color: var(--guide-blue);
}

.guide-feedback button.is-selected {
    border-color: var(--guide-blue);
    background: var(--guide-blue-soft);
    color: var(--guide-text);
}

.guide-feedback button:disabled {
    cursor: default;
    opacity: 0.6;
}

.guide-feedback button.is-selected:disabled {
    opacity: 1;
}

.guide-feedback p {
    flex-basis: 100%;
    margin: 0;
    color: var(--guide-muted);
    font-size: 14px;
}

.guide-footer {
    display: flex;
    justify-content: flex-end;
    gap: 24px;
    width: min(calc(100% - 48px), var(--guide-width));
    margin: 0 auto;
    padding: 28px 0 40px;
    border-top: 1px solid var(--guide-border-soft);
    color: var(--guide-muted);
    font-size: 12px;
}

.guide-footer span {
    margin-right: auto;
}

@media (max-width: 1100px) {
    .guide-shell {
        grid-template-columns: 220px minmax(0, 1fr);
        gap: 38px;
    }

    .guide-toc {
        display: none;
    }
}

@media (max-width: 820px) {
    .guide-header-inner {
        width: min(calc(100% - 32px), var(--guide-width));
        height: 60px;
    }

    .guide-brand img {
        width: 26px;
        height: 26px;
    }

    .guide-brand span {
        font-size: 15px;
    }

    .guide-primary-nav,
    .guide-header-actions,
    .guide-sidebar {
        display: none;
    }

    .guide-mobile-menu {
        position: relative;
        display: block;
        margin-left: auto;
    }

    .guide-mobile-menu > summary {
        width: 42px;
        height: 42px;
        display: grid;
        place-content: center;
        gap: 4px;
        cursor: pointer;
        list-style: none;
    }

    .guide-mobile-menu > summary::-webkit-details-marker {
        display: none;
    }

    .guide-mobile-menu > summary span {
        width: 19px;
        height: 2px;
        background: var(--guide-text);
    }

    .guide-mobile-menu > div {
        position: absolute;
        top: 49px;
        right: 0;
        width: min(280px, calc(100vw - 32px));
        display: flex;
        flex-direction: column;
        gap: 4px;
        padding: 12px;
        border: 1px solid var(--guide-border);
        border-radius: 7px;
        background: var(--guide-surface-raised);
        box-shadow: 0 18px 40px rgba(0, 0, 0, 0.38);
    }

    .guide-mobile-menu a {
        padding: 10px;
        color: var(--guide-muted);
        font-size: 14px;
    }

    .guide-mobile-menu label {
        margin: 9px 10px 0;
        color: var(--guide-muted);
        font-size: 11px;
    }

    .guide-mobile-menu select {
        width: 100%;
        padding: 9px;
        border: 1px solid var(--guide-border);
        border-radius: 5px;
        background: var(--guide-bg);
        color: var(--guide-text);
    }

    .guide-mobile-navigation {
        position: sticky;
        z-index: 20;
        top: 60px;
        display: block;
        border-bottom: 1px solid var(--guide-border-soft);
        background: var(--guide-bg);
    }

    .guide-mobile-navigation > summary {
        width: min(calc(100% - 32px), var(--guide-width));
        min-height: 48px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin: 0 auto;
        cursor: pointer;
        list-style: none;
        color: var(--guide-muted);
        font-size: 13px;
        font-weight: 700;
    }

    .guide-mobile-navigation > summary::after {
        content: "+";
        color: var(--guide-blue);
        font-size: 20px;
    }

    .guide-mobile-navigation[open] > summary::after {
        content: "−";
    }

    .guide-mobile-navigation > summary::-webkit-details-marker {
        display: none;
    }

    .guide-mobile-navigation > div {
        max-height: calc(100vh - 108px);
        overflow-y: auto;
        padding: 0 16px 22px;
        border-top: 1px solid var(--guide-border-soft);
        background: var(--guide-bg);
    }

    .guide-mobile-navigation .guide-navigation {
        position: static;
        width: 100%;
        max-width: 520px;
        margin: 20px auto 0;
    }

    .guide-shell {
        display: block;
        width: min(calc(100% - 32px), 760px);
        min-height: auto;
    }

    .guide-content {
        padding: 48px 0 76px;
    }

    .guide-hub h1,
    .guide-article h1 {
        font-size: 36px;
    }

    .guide-lead {
        font-size: 16px;
    }

    .guide-footer {
        width: min(calc(100% - 32px), 760px);
        flex-wrap: wrap;
    }
}

@media (max-width: 420px) {
    .guide-content {
        padding-top: 38px;
    }

    .guide-hub h1,
    .guide-article h1 {
        font-size: 31px;
    }

    .guide-featured {
        grid-template-columns: 34px 1fr;
    }

    .guide-featured .guide-arrow,
    .guide-coming-soon {
        display: none;
    }

    .guide-chapter-header {
        grid-template-columns: 34px 1fr;
        gap: 10px;
    }

    .guide-article-list {
        margin-left: 44px;
    }

    .guide-article-list li {
        grid-template-columns: minmax(0, 1fr);
        gap: 0;
        padding: 8px 0;
    }

    .guide-article-list li > a,
    .guide-planned-article {
        padding: 4px 0;
    }

    .guide-priority {
        width: fit-content;
        margin-bottom: 4px;
    }

    .guide-screenshot {
        padding: 14px;
    }

    .guide-feedback {
        align-items: flex-start;
        flex-direction: column;
    }
}