/* ==========================================================================
   대한AI생활체육회(KASA) 문서 등재 시스템
   style.css
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 변수 및 기본 초기화
   -------------------------------------------------------------------------- */
:root {
    /* 색상: 공공기관 스타일 - 흰색 배경 + 남색 포인트 */
    --color-navy-900: #0f2747;
    --color-navy-800: #16345c;
    --color-navy-700: #1c4272;
    --color-navy-600: #2a5a94;
    --color-navy-100: #e8eef6;
    --color-navy-050: #f4f7fb;

    --color-white: #ffffff;
    --color-bg: #f7f8fa;
    --color-border: #dde2e8;
    --color-border-strong: #c3cbd6;

    --color-text: #1f2937;
    --color-text-muted: #5b6472;
    --color-text-faint: #8b93a1;

    --color-danger: #b3261e;
    --color-focus: #2a5a94;

    /* 타이포그래피 */
    --font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Malgun Gothic', sans-serif;

    /* 레이아웃 */
    --header-height: 68px;
    --footer-height: 48px;
    --sidebar-width: 300px;
    --radius-sm: 4px;
    --radius-md: 6px;

    /* 전환(불필요한 애니메이션 배제, 최소한의 상태 전환만 사용) */
    --transition-fast: 120ms ease;
}

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

html {
    height: 100%;
}

body {
    margin: 0;
    min-height: 100%;
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, p, ul, li {
    margin: 0;
    padding: 0;
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

img {
    max-width: 100%;
    display: block;
}

/* 스킵 링크 (접근성) */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 1000;
    background: var(--color-navy-900);
    color: var(--color-white);
    padding: 12px 20px;
    border-radius: 0 0 var(--radius-sm) 0;
    font-weight: 500;
    text-decoration: none;
}

.skip-link:focus {
    left: 0;
}

/* 공통 포커스 표시 (접근성 - 키보드 조작 시 항상 표시) */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   2. 상단 헤더
   -------------------------------------------------------------------------- */
.site-header {
    height: var(--header-height);
    background-color: var(--color-white);
    border-bottom: 2px solid var(--color-navy-900);
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.site-header__inner {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
}

.site-header__brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.site-header__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    padding: 0 10px;
    background-color: var(--color-navy-900);
    color: var(--color-white);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.06em;
    border-radius: var(--radius-sm);
}

.site-header__titles {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.site-header__org {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-muted);
}

.site-header__title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-navy-900);
}

/* --------------------------------------------------------------------------
   3. 메인 레이아웃 (2단 구조)
   -------------------------------------------------------------------------- */
.layout {
    flex: 1;
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: 20px;
    padding: 24px;
    align-items: start;
}

/* --------------------------------------------------------------------------
   4. 좌측: 문서 목록
   -------------------------------------------------------------------------- */
.doc-list {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: sticky;
    top: 24px;
}

.doc-list__heading {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-white);
    background-color: var(--color-navy-900);
    padding: 14px 18px;
    letter-spacing: 0.02em;
}

.doc-list__items {
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.doc-list__button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    text-align: left;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    padding: 12px 12px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.doc-list__button:hover {
    background-color: var(--color-navy-050);
}

.doc-list__button .doc-list__arrow {
    flex-shrink: 0;
    width: 14px;
    height: 14px;
    color: var(--color-navy-700);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.doc-list__button[aria-current="true"] {
    background-color: var(--color-navy-100);
    color: var(--color-navy-900);
    font-weight: 700;
}

.doc-list__button[aria-current="true"] .doc-list__arrow {
    opacity: 1;
}

.doc-list__label {
    flex: 1;
    min-width: 0;
    overflow-wrap: break-word;
}

.doc-list__ext {
    flex-shrink: 0;
    font-size: 11px;
    font-weight: 700;
    color: var(--color-navy-700);
    background-color: var(--color-navy-100);
    border-radius: 3px;
    padding: 2px 6px;
    letter-spacing: 0.03em;
}

.doc-list__empty {
    padding: 24px 18px;
    font-size: 14px;
    color: var(--color-text-faint);
    text-align: center;
}

/* --------------------------------------------------------------------------
   5. 우측: 문서 보기
   -------------------------------------------------------------------------- */
.doc-view {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    min-height: 640px;
    overflow: hidden;
}

.doc-view__toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.doc-view__title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-navy-900);
    overflow-wrap: anywhere;
}

.doc-view__actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 38px;
    padding: 0 14px;
    background-color: var(--color-white);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-sm);
    color: var(--color-navy-900);
    font-size: 13px;
    font-weight: 500;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn-icon:hover:not(:disabled) {
    background-color: var(--color-navy-050);
    border-color: var(--color-navy-700);
}

.btn-icon:disabled {
    color: var(--color-text-faint);
    border-color: var(--color-border);
    cursor: not-allowed;
}

.btn-icon__svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* 문서 본문 영역 */
.doc-view__body {
    flex: 1;
    display: flex;
    min-height: 0;
}

/* 빈 상태 (초기 안내) */
.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    padding: 60px 20px;
    color: var(--color-text-faint);
}

.empty-state__icon {
    width: 48px;
    height: 48px;
    color: var(--color-border-strong);
}

.empty-state__text {
    font-size: 15px;
    font-weight: 500;
}

/* PDF 미리보기 (iframe/object) */
.doc-frame-wrap {
    flex: 1;
    display: flex;
    min-height: 0;
}

.doc-frame {
    flex: 1;
    width: 100%;
    height: 100%;
    min-height: 640px;
    border: none;
    display: block;
    background-color: var(--color-bg);
}

/* 미리보기 불가 안내 (DOC/DOCX/HWP/HWPX) */
.unsupported-preview {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    padding: 60px 24px;
    text-align: center;
}

.unsupported-preview__icon {
    width: 56px;
    height: 56px;
    color: var(--color-navy-700);
}

.unsupported-preview__title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-navy-900);
}

.unsupported-preview__desc {
    font-size: 14px;
    color: var(--color-text-muted);
    max-width: 420px;
    line-height: 1.6;
}

.unsupported-preview__badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    color: var(--color-navy-700);
    background-color: var(--color-navy-100);
    border-radius: 3px;
    padding: 3px 10px;
    letter-spacing: 0.03em;
}

.unsupported-preview__download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 44px;
    padding: 0 22px;
    background-color: var(--color-navy-900);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
    transition: background-color var(--transition-fast);
}

.unsupported-preview__download:hover {
    background-color: var(--color-navy-700);
}

.unsupported-preview__download .btn-icon__svg {
    width: 17px;
    height: 17px;
}

/* 오류 상태 */
.error-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    padding: 60px 24px;
    text-align: center;
    color: var(--color-danger);
}

.error-state__icon {
    width: 44px;
    height: 44px;
}

.error-state__text {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
}

/* 인쇄 전용 iframe (화면에 표시되지 않음) */
.print-frame {
    position: absolute;
    width: 0;
    height: 0;
    border: none;
    visibility: hidden;
}

/* --------------------------------------------------------------------------
   6. 하단 푸터
   -------------------------------------------------------------------------- */
.site-footer {
    height: var(--footer-height);
    display: flex;
    align-items: center;
    justify-content: center;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-white);
    flex-shrink: 0;
}

.site-footer p {
    font-size: 12px;
    color: var(--color-text-faint);
}

/* --------------------------------------------------------------------------
   7. 반응형 (1024px 이하: 상단 목록 / 하단 내용)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .layout {
        grid-template-columns: 1fr;
        padding: 16px;
        gap: 16px;
    }

    .doc-list {
        position: static;
    }

    .doc-list__items {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }

    .doc-list__button {
        width: auto;
        flex: 1 1 auto;
        justify-content: center;
        text-align: center;
        border: 1px solid var(--color-border);
    }

    .doc-list__button[aria-current="true"] {
        border-color: var(--color-navy-900);
    }

    .doc-view {
        min-height: 480px;
    }

    .doc-frame {
        min-height: 480px;
    }

    .site-header__title {
        font-size: 16px;
    }
}

@media (max-width: 600px) {
    .site-header__inner {
        padding: 0 16px;
    }

    .site-header__org {
        display: none;
    }

    .doc-view__toolbar {
        padding: 14px 16px;
    }

    .doc-view__actions {
        width: 100%;
        justify-content: flex-start;
    }

    .btn-icon span {
        display: none;
    }

    .btn-icon {
        padding: 0 10px;
        width: 40px;
        justify-content: center;
    }

    .doc-list__items {
        flex-direction: column;
    }

    .doc-list__button {
        justify-content: flex-start;
        text-align: left;
    }
}

/* --------------------------------------------------------------------------
   8. 인쇄 스타일 (화면 UI 숨김 - 실제 인쇄는 iframe에서 별도 처리)
   -------------------------------------------------------------------------- */
@media print {
    .site-header,
    .doc-list,
    .site-footer,
    .doc-view__toolbar {
        display: none !important;
    }

    .layout {
        display: block;
        padding: 0;
    }

    .doc-view {
        border: none;
    }
}