/* ==========================================================================
   INFOSNAKE 공통 테마
   sandcat.co.kr 과 같은 디자인 언어를 쓴다: 흑/백 기조, 오렌지 액센트 하나,
   가는 제목 서체, 선 하나로 구획, 여백은 clamp 토큰으로 일괄 조절.
   이전 테마의 보라-파랑 그라디언트(#667eea→#764ba2)와 Tailwind CDN 은 걷어냈다.
   ========================================================================== */

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

:root {
    --color-black:      #000000;
    --color-white:      #ffffff;
    --color-ink:        #383635;   /* 본문 먹색 — 순검정보다 눈이 편하다 */
    --color-gray:       #666666;
    --color-gray-light: #f5f5f5;
    --color-line:       #e0e0e0;   /* 격자·구획선 */
    --color-line-dark:  rgba(255, 255, 255, 0.18);

    /* ── 브랜드 팔레트 (2026-09-22 교체) ──────────────────────────────
       punch-red #e63946 · honeydew #f1faee · frosted-blue #a8dadc
       cerulean #457b9d · oxford-navy #1d3557
       -ink / -strong 는 대비를 맞추려고 파생한 단계다. 실측은 PALETTE.md 참조. */

    --color-accent:        #e63946;   /* 강조 마크·지도 강조. 글자에는 쓰지 않는다 */
    --color-accent-strong: #c1121f;   /* 글자를 얹는 버튼 바탕 (흰 글자 6.22:1 AA) */
    --color-accent-ink:    #c1121f;   /* 흰 배경 위 강조 글자 (6.22:1 AA) */
    --color-accent-soft:   #fbe3e5;   /* 강조 옅은 면 */

    --color-primary:       #457b9d;   /* cerulean — 링크·보조 강조 (흰 배경 4.59:1 AA) */
    --color-soft:          #a8dadc;   /* frosted-blue — 옅은 면·구획 */
    --color-surface-soft:  #f1faee;   /* honeydew — 옅은 바탕 */

    /* 짙은 파랑 — 푸터·비교 트레이·모달 머리말처럼 넓게 깔리는 면
       대비 실측: 흰 글자 12.36:1(AAA) · 본문 78% 8.20:1(AAA)
                  보조 62% 5.77:1(AA) · frosted-blue 8.08:1(AAA) */
    --color-navy:        #1d3557;
    --color-navy-dark:   #132440;
    --color-navy-light:  #2c4a72;
    --color-on-navy:     rgba(255, 255, 255, 0.78);
    --color-on-navy-dim: rgba(255, 255, 255, 0.62);
    --color-accent-on-navy: #a8dadc;  /* navy 위 강조 글자 — 붉은색은 2.97:1 로 미달이라 쓰지 않는다 */

    /* 세로 여백을 토큰 하나로 묶어 한 곳에서 조절한다 */
    --space-section: clamp(3.25rem, 5.5vw, 5.5rem);
    --space-header:  clamp(1.75rem, 2.8vw, 2.75rem);
    --space-block:   clamp(1.75rem, 3vw, 3rem);

    --header-h: 76px;
}

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue',
                 'Apple SD Gothic Neo', 'Noto Sans KR', Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-ink);
    background: var(--color-white);
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a { color: inherit; }

img { max-width: 100%; height: auto; }

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 3rem);
}

/* 키보드 사용자용 — 마우스 클릭에는 테두리가 뜨지 않는다 */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 2000;
    background: var(--color-black);
    color: var(--color-white);
    padding: 0.75rem 1.25rem;
    text-decoration: none;
}
.skip-link:focus { left: 0; }

/* ---------- 헤더 ---------------------------------------------------------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-line);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 3rem);
    height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    flex-shrink: 0;
}
.brand img { width: 36px; height: 36px; object-fit: contain; }
.brand-name {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--color-black);
}
.brand-tag {
    display: block;
    font-size: 0.72rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--color-gray);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: clamp(1rem, 2.2vw, 2rem);
    list-style: none;
}
.nav-menu a {
    text-decoration: none;
    font-size: 0.93rem;
    font-weight: 500;
    color: var(--color-ink);
    padding: 0.35rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s ease, color 0.2s ease;
    white-space: nowrap;
}
.nav-menu a:hover,
.nav-menu a[aria-current="page"] {
    color: var(--color-black);
    border-bottom-color: var(--color-accent);
}

.nav-toggle {
    display: none;
    width: 40px; height: 40px;
    background: none;
    border: 1px solid var(--color-line);
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}
.nav-toggle span {
    display: block;
    width: 18px; height: 1.5px;
    background: var(--color-black);
    transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ---------- 본문 공통 ------------------------------------------------------ */

.site-main { flex: 1 0 auto; }

.page-head {
    padding: var(--space-section) 0 var(--space-header);
    border-bottom: 1px solid var(--color-line);
}
.page-head .eyebrow {
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-accent-ink);
    margin-bottom: 0.9rem;
}
.page-head h1 {
    font-size: clamp(1.9rem, 3.6vw, 2.9rem);
    font-weight: 300;
    letter-spacing: -0.02em;
    color: var(--color-black);
    margin-bottom: 0.75rem;
}
.page-head p {
    font-size: clamp(0.98rem, 1.4vw, 1.1rem);
    font-weight: 300;
    color: var(--color-gray);
    max-width: 62ch;
}

.section { padding: var(--space-section) 0; }

.section-header { margin-bottom: var(--space-header); }
.section-header h2 {
    font-size: clamp(1.4rem, 2.4vw, 1.85rem);
    font-weight: 300;
    letter-spacing: -0.015em;
    color: var(--color-black);
}
.section-header p {
    margin-top: 0.6rem;
    color: var(--color-gray);
    font-weight: 300;
}

/* ---------- 서비스 카드 ---------------------------------------------------- */

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1px;
    background: var(--color-white);
}

/* 칸 사이 선은 카드마다 1px 그림자로 그린다. 서로 겹쳐 하나의 선처럼 보이고,
   줄 끝에 빈 칸이 남아도 회색 덩어리가 드러나지 않는다. */
.service-card,
.service-card.is-soon {
    box-shadow: 0 0 0 1px var(--color-line);
}

.service-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--color-white);
    padding: 2.25rem 1.9rem 1.9rem;
    text-decoration: none;
    transition: background 0.25s ease;
}

/* 마우스를 올리면 바탕이 옅은 회색이 되고, 칸 위쪽에 붉은 띠가 나타난다.
   sandcat 의 카드와 같은 방식이다 — 선으로 나눈 격자를 유지하면서
   지금 어느 칸을 보고 있는지만 표시한다. */
.service-card::after,
.si-hoverbar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.25s ease;
}
.service-card:hover { background: var(--color-gray-light); }
.service-card:hover::after,
.si-hoverbar:hover::after,
.si-hoverbar:focus-within::after { transform: scaleX(1); }

@media (prefers-reduced-motion: reduce) {
    .service-card::after,
    .si-hoverbar::after { transition: none; }
}

.service-card .num {
    font-size: 0.8rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    color: var(--color-gray);
    margin-bottom: 1.1rem;
}
.service-card h3 {
    font-size: 1.16rem;
    font-weight: 600;
    color: var(--color-black);
    letter-spacing: -0.01em;
    margin-bottom: 0.55rem;
}
.service-card p {
    font-size: 0.9rem;
    font-weight: 300;
    color: var(--color-gray);
    line-height: 1.65;
    margin-bottom: 1.6rem;
    flex: 1;
}
.service-card .meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}
.service-card .arrow {
    font-size: 1.4rem;
    line-height: 1;
    color: var(--color-black);
    transition: transform 0.25s ease;
}
.service-card:hover .arrow { transform: translateX(8px); }

.tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-gray);
    border: 1px solid var(--color-line);
    padding: 0.2rem 0.6rem;
}
.service-card:hover .tag { border-color: #cfcfcf; }

/* 준비 중 카드 — 눌러도 이동하지 않으므로 링크가 아닌 div 로 낸다 */
.service-card.is-soon { background: #fafafa; }
.service-card.is-soon::after { display: none; }
.service-card.is-soon:hover { background: #fafafa; }
.service-card.is-soon h3 { color: var(--color-gray); font-weight: 500; }
.service-card.is-soon .tag { color: var(--color-accent-ink); border-color: var(--color-soft); }

/* ---------- 필터 ---------------------------------------------------------- */

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--space-header);
}
.filter-bar button {
    font: inherit;
    font-size: 0.86rem;
    padding: 0.45rem 1rem;
    background: var(--color-white);
    border: 1px solid var(--color-line);
    color: var(--color-gray);
    cursor: pointer;
    transition: all 0.2s ease;
}
.filter-bar button:hover { border-color: var(--color-ink); color: var(--color-ink); }
.filter-bar button[aria-pressed="true"] {
    background: var(--color-black);
    border-color: var(--color-black);
    color: var(--color-white);
}

/* ---------- 접이식 (준비 중 목록) ------------------------------------------ */

.disclosure { border-top: 1px solid var(--color-line); margin-top: var(--space-block); }
.disclosure > summary {
    list-style: none;
    cursor: pointer;
    padding: 1.4rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.98rem;
    color: var(--color-ink);
}
.disclosure > summary::-webkit-details-marker { display: none; }
.disclosure > summary .sign {
    font-size: 1.2rem;
    font-weight: 300;
    color: var(--color-gray);
    transition: transform 0.25s ease;
}
.disclosure[open] > summary .sign { transform: rotate(45deg); }
.disclosure > summary:hover { color: var(--color-black); }
.disclosure .disclosure-body { padding-bottom: var(--space-block); }

/* ---------- 버튼 ---------------------------------------------------------- */

.btn {
    display: inline-block;
    font: inherit;
    font-size: 0.92rem;
    font-weight: 500;
    padding: 0.7rem 1.6rem;
    text-decoration: none;
    border: 1px solid var(--color-black);
    background: var(--color-black);
    color: var(--color-white);
    cursor: pointer;
    transition: all 0.2s ease;
}
.btn:hover { background: var(--color-white); color: var(--color-black); }
.btn-ghost { background: transparent; color: var(--color-black); }
.btn-ghost:hover { background: var(--color-black); color: var(--color-white); }

/* ---------- 푸터 ---------------------------------------------------------- */

.site-footer {
    flex-shrink: 0;
    background: var(--color-navy);
    color: var(--color-on-navy);
    font-size: 0.9rem;
}
.footer-top {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: var(--space-block);
    padding: var(--space-section) 0 var(--space-block);
}
.footer-brand .name {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--color-white);
    margin-bottom: 0.8rem;
}
.footer-brand p { font-weight: 300; line-height: 1.7; max-width: 42ch; }

.footer-col h4 {
    font-size: 0.74rem;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--color-white);
    margin-bottom: 1.1rem;
}
.footer-col ul { list-style: none; display: grid; gap: 0.6rem; }
.footer-col a {
    text-decoration: none;
    color: var(--color-on-navy);
    transition: color 0.2s ease;
}
.footer-col a:hover { color: var(--color-accent-on-navy); }

.footer-bottom {
    border-top: 1px solid var(--color-line-dark);
    padding: 1.5rem 0 2rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.82rem;
    color: var(--color-on-navy-dim);
}

/* ---------- 반응형 -------------------------------------------------------- */

@media (max-width: 860px) {
    .nav-toggle { display: flex; }
    .nav-menu {
        position: absolute;
        top: var(--header-h);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--color-white);
        border-bottom: 1px solid var(--color-line);
        padding: 0.5rem 0;
        display: none;
    }
    .nav-menu.is-open { display: flex; }
    .nav-menu a {
        padding: 0.85rem clamp(1rem, 4vw, 3rem);
        border-bottom: none;
        border-left: 2px solid transparent;
    }
    .nav-menu a:hover,
    .nav-menu a[aria-current="page"] { border-left-color: var(--color-accent); }

    .footer-top { grid-template-columns: 1fr; }
    .brand-tag { display: none; }
}

@media (max-width: 520px) {
    .service-grid { grid-template-columns: 1fr; }
    .service-card { padding: 1.75rem 1.4rem 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ---------- 아이콘 ---------------------------------------------------------
   Font Awesome CDN 대신 lib/icons.php 의 인라인 SVG 스프라이트를 쓴다.
   크기는 글자에 맞춰 1em, 색은 currentColor 를 따른다. */
.ic {
    width: 1em;
    height: 1em;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    vertical-align: -0.14em;
    flex-shrink: 0;
}

/* ---------- 홈 서비스 검색 ------------------------------------------------ */

.visually-hidden {
    position: absolute;
    width: 1px; height: 1px;
    margin: -1px; padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.service-toolbar { margin-bottom: 1rem; }

.search-field input {
    font: inherit;
    width: 100%;
    max-width: 420px;
    padding: 0.7rem 1rem;
    border: 1px solid var(--color-line);
    background: var(--color-white);
    color: var(--color-ink);
    transition: border-color 0.2s ease;
}
.search-field input::placeholder { color: #9a9a9a; }
.search-field input:focus {
    outline: none;
    border-color: var(--color-black);
}

/* ---------- 사진 머리말 -----------------------------------------------------
   sandcat 의 히어로와 같은 방식: 사진 위에 어두운 막을 덮고 흰 글자를 올린다.
   배경 이미지는 쓰는 쪽에서 --page-head-bg 로 지정한다. */

.page-head--photo {
    position: relative;
    isolation: isolate;
    border-bottom: 0;
    background: var(--page-head-bg) center/cover no-repeat;
    color: var(--color-white);
    padding: clamp(4rem, 9vw, 7.5rem) 0 clamp(3.5rem, 7vw, 6rem);
}
.page-head--photo::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    /* 글자가 놓이는 왼쪽을 더 어둡게 해 대비를 확보한다 */
    background: linear-gradient(90deg, rgba(0, 0, 0, 0.78) 0%, rgba(0, 0, 0, 0.55) 45%, rgba(0, 0, 0, 0.3) 100%);
}
.page-head--photo .eyebrow { color: var(--color-accent-on-navy); }
.page-head--photo h1 { color: var(--color-white); }
.page-head--photo p   { color: rgba(255, 255, 255, 0.85); }

@media (max-width: 640px) {
    .page-head--photo::before {
        background: linear-gradient(180deg, rgba(0, 0, 0, 0.62) 0%, rgba(0, 0, 0, 0.78) 100%);
    }
}