@charset "UTF-8";

/* ==========================================================
   GREYFALL · FAQ
   accordion = 네이티브 <details>/<summary>
   기능은 브라우저가 담당한다. 여기서는 위계와 가독성만 다룬다.
   ========================================================== */


/* ----------------------------------------------------------
   01 · LIST
   ---------------------------------------------------------- */

.gf-faq-list {
    counter-reset: gf-faq;

    border-top: 1px solid var(--gf-line-strong);
}

.gf-faq-list details {
    counter-increment: gf-faq;

    border-bottom: 1px solid var(--gf-line);

    transition: background-color 160ms ease;
}

.gf-faq-list details:hover,
.gf-faq-list details[open] {
    background-color: rgba(0, 0, 0, 0.20);
}


/* ----------------------------------------------------------
   02 · QUESTION
   ---------------------------------------------------------- */

.gf-faq-list summary {
    position: relative;

    display: grid;
    grid-template-columns:
        56px
        minmax(0, 1fr)
        30px;

    align-items: start;
    gap: 0 12px;

    /* 터치 영역 확보 */
    min-height: 62px;
    padding: 19px 0;

    cursor: pointer;

    list-style: none;

    font-size: clamp(0.95rem, 2vw, 1.06rem);
    font-weight: 600;
    line-height: 1.62;
    letter-spacing: -0.014em;

    color: var(--gf-text);

    transition: color 140ms ease;
}

.gf-faq-list summary::-webkit-details-marker {
    display: none;
}

.gf-faq-list summary::marker {
    content: "";
}

/* 질문 번호 */
.gf-faq-list summary::before {
    content: "Q" counter(gf-faq, decimal-leading-zero);

    font-family: var(--gf-mono);
    font-size: 0.64rem;
    font-weight: 500;
    line-height: 2.2;
    letter-spacing: 0.055em;

    color: var(--gf-text-ghost);

    transition: color 140ms ease;
}

/* 여닫기 표시 — + / − */
.gf-faq-list summary::after {
    content: "";

    grid-column: 3;

    width: 13px;
    height: 13px;

    margin-top: 0.42em;
    justify-self: end;

    background:
        linear-gradient(
            var(--gf-text-faint),
            var(--gf-text-faint)
        ) center / 13px 1px no-repeat,
        linear-gradient(
            var(--gf-text-faint),
            var(--gf-text-faint)
        ) center / 1px 13px no-repeat;

    transition: transform 200ms ease, background-image 140ms ease;
}

.gf-faq-list summary:hover {
    color: var(--gf-text-strong);
}

.gf-faq-list summary:hover::before {
    color: var(--gf-red);
}

.gf-faq-list details[open] summary {
    color: var(--gf-text-strong);
}

.gf-faq-list details[open] summary::before {
    color: var(--gf-red);
}

.gf-faq-list details[open] summary::after {
    transform: rotate(90deg);

    background:
        linear-gradient(
            var(--gf-red),
            var(--gf-red)
        ) center / 13px 1px no-repeat;
}


/* ----------------------------------------------------------
   03 · ANSWER
   ---------------------------------------------------------- */

.gf-faq-list details > p {
    max-width: 68ch;

    margin: 0 0 14px;
    padding-left: 68px;

    font-size: 0.89rem;
    line-height: 1.92;

    color: var(--gf-text-dim);
}

/* 답변 첫 문단 좌측 기준선 */
.gf-faq-list details > p:first-of-type {
    position: relative;
    padding-top: 2px;
}

.gf-faq-list details > p:first-of-type::before {
    content: "";

    position: absolute;
    left: 56px;
    top: 0.5em;
    bottom: -14px;

    width: 1px;

    background: var(--gf-line);
}

.gf-faq-list details > p:last-of-type {
    margin-bottom: 26px;
}

.gf-faq-list details > p strong {
    font-weight: 700;
    color: var(--gf-text-strong);
}

.gf-faq-list details > p a {
    padding-bottom: 1px;

    border-bottom: 1px solid var(--gf-red);

    font-family: var(--gf-mono);
    font-size: 0.86em;
    letter-spacing: 0.06em;

    color: var(--gf-text-strong);
}

.gf-faq-list details > p a:hover {
    color: var(--gf-red-bright);
}


/* ----------------------------------------------------------
   04 · MORE (SOURCE GUIDE)
   ---------------------------------------------------------- */

.gf-faq-more {
    display: grid;
    gap: 16px;

    margin-top: clamp(32.2px, 3.78vw, 50.4px);
    padding-top: clamp(21px, 2.52vw, 30.8px);

    border-top: 1px solid var(--gf-line-strong);
}

.gf-faq-more > span {
    font-family: var(--gf-mono);
    font-size: 0.62rem;
    letter-spacing: 0.13em;

    color: var(--gf-text-ghost);
}

.gf-faq-more > strong {
    max-width: 24ch;

    font-family: var(--gf-font-display);
    font-size: clamp(1.4rem, 4vw, 2.4rem);
    font-weight: var(--gf-w-display);
    line-height: 1.1;
    letter-spacing: -0.016em;

    color: var(--gf-text-strong);
}

.gf-faq-more > div {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));

    margin-top: 12px;

    border-top: 1px solid var(--gf-line);
    border-left: 1px solid var(--gf-line);
}

.gf-faq-more > div a {
    display: flex;
    align-items: center;

    min-width: 0;
    min-height: 54px;
    padding: 16px 18px;

    border-right: 1px solid var(--gf-line);
    border-bottom: 1px solid var(--gf-line);

    font-family: var(--gf-mono);
    font-size: 0.66rem;
    letter-spacing: 0.075em;

    color: var(--gf-text-dim);

    transition: color 140ms ease, background-color 140ms ease;
}

.gf-faq-more > div a:hover {
    color: var(--gf-text-strong);
    background: rgba(255, 255, 255, 0.028);
}


/* ==========================================================
   RESPONSIVE
   ========================================================== */

@media (max-width: 860px) {

    .gf-faq-list summary {
        grid-template-columns:
            44px
            minmax(0, 1fr)
            26px;

        gap: 0 8px;

        min-height: 60px;
        padding: 18px 0;

        font-size: 0.96rem;
        line-height: 1.6;
    }

    .gf-faq-list summary::before {
        font-size: 0.6rem;
        line-height: 2.3;
    }

    .gf-faq-list details > p {
        padding-left: 52px;

        font-size: 0.88rem;
        line-height: 1.9;
    }

    .gf-faq-list details > p:first-of-type::before {
        left: 44px;
    }

    .gf-faq-more > div {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}


@media (max-width: 420px) {

    .gf-faq-list summary {
        grid-template-columns:
            minmax(0, 1fr)
            24px;

        gap: 0 8px;
    }

    /* 좁은 화면에서는 번호를 질문 위로 */
    .gf-faq-list summary::before {
        grid-column: 1 / -1;

        margin-bottom: 8px;
        line-height: 1.2;
    }

    .gf-faq-list summary::after {
        grid-row: 2;
        grid-column: 2;
    }

    .gf-faq-list details > p {
        padding-left: 0;
    }

    .gf-faq-list details > p:first-of-type::before {
        display: none;
    }
}


/* ----------------------------------------------------------
   99 · SURFACE POLISH
   ---------------------------------------------------------- */

.gf-faq-list details[open] {
    background-image:
        linear-gradient(
            180deg,
            rgba(0, 0, 0, 0.08),
            transparent 42%
        );

    box-shadow: var(--gf-inset-soft);
}


.gf-faq-list details:hover {
    background-image:
        linear-gradient(
            180deg,
            rgba(0, 0, 0, 0.06),
            transparent 42%
        );
}


/* 펼쳐진 항목 좌측 red rule */
.gf-faq-list details {
    position: relative;
}

.gf-faq-list details::before {
    content: "";

    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;

    width: 1px;

    background: var(--gf-red-bright);

    transform: scaleY(0);
    transform-origin: top;
    transition: transform 340ms cubic-bezier(0.22, 1, 0.36, 1);
}

.gf-faq-list details[open]::before {
    transform: scaleY(1);
}

.gf-faq-more > div a {
    background-image:
        linear-gradient(
            180deg,
            rgba(255, 255, 255, 0.014),
            transparent 50%
        );
}