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

/* display:flex 등을 지정한 요소도 hidden 속성이 항상 이기도록 보장 */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans KR', sans-serif;
  font-size: var(--font-size-base);
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, button, select { font-size: var(--font-size-sm); }

input:focus-visible, button:focus-visible, select:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.app {
  display: flex;
  height: 100vh;
  min-height: 560px;
}

/* ---------- 사이드바 ---------- */
.sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 16px;
  gap: 20px;
  overflow-y: auto;
}

.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 8px; background: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; color: #fff; font-size: 16px;
}
.brand-name { font-size: 18px; font-weight: 700; letter-spacing: -0.2px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 1px solid var(--border); border-radius: 9px; padding: 9px 14px;
  background: var(--surface-2); color: var(--text); font-weight: 600; font-size: var(--font-size-sm);
}
.btn:hover { background: var(--surface-3); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost { background: none; border-color: transparent; }
.btn-ghost:hover { background: var(--surface-2); }
.btn-sm { padding: 6px 10px; font-size: var(--font-size-xs); }

.nav-list { display: flex; flex-direction: column; gap: 2px; }
.nav-link {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 8px;
  color: var(--text-2); font-size: var(--font-size-sm); font-weight: 500;
}
.nav-link:hover { background: var(--surface-2); }
.nav-link.active { background: var(--accent-soft); color: var(--accent-strong); font-weight: 700; }
.nav-link svg { flex-shrink: 0; }

.sidebar-spacer { flex-grow: 1; }

.quota-box {
  display: flex; flex-direction: column; gap: 8px; padding: 12px;
  border-radius: var(--radius); background: var(--surface-2); border: 1px solid var(--border);
  font-size: var(--font-size-xs); color: var(--text-2);
}
.quota-bar { width: 100%; height: 6px; border-radius: 3px; background: var(--border); overflow: hidden; }
.quota-fill { height: 100%; background: var(--accent); }

/* ---------- 메인 ---------- */
.main { flex-grow: 1; display: flex; flex-direction: column; min-width: 0; }

.topbar {
  height: 58px; flex-shrink: 0; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 14px; padding: 0 var(--gutter);
}
.topbar .spacer { flex-grow: 1; }

.content {
  flex-grow: 1; overflow-y: auto; padding: 22px var(--gutter);
  display: flex; flex-direction: column; gap: 20px;
}

.breadcrumb { display: flex; align-items: center; gap: 6px; font-size: var(--font-size-sm); color: var(--text-2); flex-wrap: wrap; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: var(--text-3); }

.section-label {
  font-size: 12px; font-weight: 700; color: var(--text-3);
  text-transform: uppercase; letter-spacing: 0.4px;
}

.spacer { flex-grow: 1; }

.selection-bar {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  border-radius: var(--radius); background: var(--accent-soft); border: 1px solid var(--accent);
  font-size: var(--font-size-sm); font-weight: 600; color: var(--accent-strong);
}

.card-select {
  position: absolute; top: 8px; left: 8px; width: 18px; height: 18px; z-index: 1;
}
.folder-card, .card { position: relative; }

.trash-list { display: flex; flex-direction: column; gap: 8px; }
.trash-item {
  display: flex; align-items: center; gap: 12px; padding: 12px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.trash-item .name { flex-grow: 1; font-size: var(--font-size-sm); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.trash-item .meta { font-size: var(--font-size-xs); color: var(--text-3); flex-shrink: 0; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
}

.card {
  display: flex; flex-direction: column; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--surface); overflow: hidden;
}
.card:hover { border-color: var(--accent); }
.card-thumb {
  height: 110px; background: var(--surface-2); display: flex; align-items: center; justify-content: center;
  position: relative;
}
.card-body { padding: 10px 12px; display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.card-name { font-size: var(--font-size-sm); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.card-meta { font-size: var(--font-size-xs); color: var(--text-3); }

.folder-card {
  display: flex; align-items: center; gap: 10px; padding: 12px;
  border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface);
}
.folder-card:hover { background: var(--surface-2); }

.dropzone {
  border: 1.5px dashed var(--border); border-radius: var(--radius);
  padding: 22px; text-align: center; color: var(--text-3); font-size: var(--font-size-sm);
}
.dropzone.drag-over { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.upload-list { display: flex; flex-direction: column; gap: 8px; }
.upload-item {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  font-size: var(--font-size-sm);
}
.upload-name { flex-grow: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.upload-progress-track { width: 100px; height: 5px; border-radius: 3px; background: var(--border); overflow: hidden; flex-shrink: 0; }
.upload-progress-fill { height: 100%; background: var(--accent); }
.upload-status { width: 70px; text-align: right; color: var(--text-3); font-size: var(--font-size-xs); flex-shrink: 0; }

.empty-state { color: var(--text-3); font-size: var(--font-size-sm); padding: 24px 4px; }

/* ---------- 로그인 화면 ---------- */
.login-screen {
  height: 60vh; display: flex; align-items: center; justify-content: center; background: var(--bg);
}
.login-card {
  width: 400px; max-width: calc(100vw - 32px); background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px; display: flex; flex-direction: column; gap: 16px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}
.login-card .brand { padding: 0 0 4px; }
.login-subtitle { margin: -8px 0 4px; color: var(--text-3); font-size: var(--font-size-xs); }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: var(--font-size-xs); color: var(--text-2); font-weight: 600; }
.field input {
  padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text);
}
.form-error { color: var(--danger); font-size: var(--font-size-xs); min-height: 16px; }

/* ---------- 라이트박스/뷰어 ---------- */
.lightbox {
  position: fixed; inset: 0; background: rgba(6, 6, 9, 0.86); z-index: 50;
  display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 16px;
}
.lightbox img, .lightbox video { max-width: 90vw; max-height: 78vh; border-radius: 10px; }
.lightbox iframe { width: 90vw; height: 82vh; border: none; border-radius: 10px; background: #fff; }
.lightbox-meta { color: #dcdde3; font-size: var(--font-size-sm); display: flex; gap: 14px; align-items: center; }

.pdf-viewer { display: flex; flex-direction: column; gap: 10px; align-items: center; max-height: 90vh; }
.pdf-canvas-wrap {
  max-width: 92vw; max-height: 76vh; overflow: auto; background: #fff; border-radius: 10px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5); padding: 8px; display: flex; justify-content: center;
}
.pdf-canvas-wrap canvas { display: block; }
.pdf-toolbar {
  display: flex; align-items: center; gap: 10px; background: var(--surface); color: var(--text);
  border-radius: 10px; padding: 8px 14px; width: min(92vw, 760px);
}
.pdf-toolbar input {
  padding: 6px; border-radius: 6px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text);
}
.pdf-page-label { font-size: var(--font-size-sm); color: var(--text-2); white-space: nowrap; }
.lightbox-close {
  position: absolute; top: 20px; right: 24px; background: rgba(255,255,255,0.12); border: none;
  color: #fff; border-radius: 50%; width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
}
.lightbox-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,0.12); border: none; color: #fff; font-size: 20px;
  border-radius: 50%; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.lightbox-nav:hover { background: rgba(255,255,255,0.24); }
.lightbox-nav:disabled { opacity: .3; cursor: default; }
.lightbox-nav-left { left: 20px; }
.lightbox-nav-right { right: 20px; }

/* ---------- 반응형: 태블릿 ---------- */
@media (max-width: 1279px) and (min-width: 768px) {
  .sidebar { width: 210px; }
}

/* ---------- 반응형: 모바일 — 박스형 그리드 대신 리스트, 좌우 여백 최소화 ---------- */
@media (max-width: 767px) {
  .app { flex-direction: column; height: auto; min-height: 100vh; }

  .sidebar {
    width: 100%; flex-direction: row; align-items: center; overflow-x: auto; overflow-y: visible;
    border-right: none; border-bottom: 1px solid var(--border); padding: 10px var(--gutter-mobile);
    gap: 10px;
  }
  .brand-name { display: none; }
  .nav-list { flex-direction: row; }
  .nav-link span.label { display: none; }
  .sidebar-spacer { display: none; }
  .quota-box { display: none; }

  .content { padding: 14px var(--gutter-mobile); gap: 14px; }
  .topbar { padding: 0 var(--gutter-mobile); }

  /* 카드 그리드를 줄 단위 리스트로 전환 */
  .grid {
    display: flex; flex-direction: column; gap: 0;
    border-top: 1px solid var(--border);
  }
  .card {
    flex-direction: row; align-items: center; gap: 12px;
    border-radius: 0; border: none; border-bottom: 1px solid var(--border);
    padding: 10px 2px;
  }
  .card-thumb { height: 40px; width: 40px; flex-shrink: 0; border-radius: 8px; }
  .card-body { padding: 0; flex-grow: 1; }

  .folder-card { border-radius: 0; border: none; border-bottom: 1px solid var(--border); padding: 10px 2px; }
}