:root {
  --bg: #e8edeb;
  --surface: #f8faf9;
  --ink: #14211e;
  --muted: #5b6b66;
  --line: #bfcac6;
  --accent: #0a4fd6;
  --accent-ink: #ffffff;
  --ok: #107a57;
  --err: #b3261e;
  --radius: 10px;
  --font: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "D2Coding", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101816;
    --surface: #18231f;
    --ink: #e6efec;
    --muted: #93a39d;
    --line: #2d3d38;
    --accent: #6d9bff;
    --accent-ink: #0b1220;
    --ok: #4cc79b;
    --err: #ff8a80;
  }
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
}

main, .top, .foot {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

main { flex: 1; padding-bottom: 48px; }

.top {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-top: 28px;
}

.brand {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--ink);
  text-decoration: none;
}

.tagline { color: var(--muted); font-size: 0.9rem; }

.intro { padding: 56px 0 28px; }

.intro h1 {
  margin: 0 0 14px;
  font-size: clamp(1.9rem, 6vw, 2.8rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.035em;
}

.intro h1.filename { word-break: break-all; font-size: clamp(1.4rem, 4.5vw, 2rem); }
.intro p { margin: 0 0 12px; color: var(--muted); max-width: 52ch; }

/* 업로드 영역 */
.dropzone {
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background-color .15s;
}
.dropzone:hover, .dropzone:focus-visible, .dropzone.over {
  border-color: var(--accent);
  outline: none;
}
.dropzone.over { background: color-mix(in srgb, var(--accent) 8%, var(--surface)); }
.dz-main { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; }
.dz-sub { margin-top: 6px; color: var(--muted); }
.dz-link { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

/* 파일 목록 */
.file-list { list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 12px; }

.file-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.fi-head { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; }
.fi-name { font-weight: 700; word-break: break-all; }
.fi-size { color: var(--muted); font-size: 0.9rem; white-space: nowrap; }

.bar { height: 8px; margin: 12px 0 8px; border-radius: 99px; background: var(--line); overflow: hidden; }
.bar > i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s linear; }
.file-item.done .bar > i { background: var(--ok); }
.file-item.failed .bar > i { background: var(--err); }

.fi-status { font-size: 0.88rem; color: var(--muted); display: flex; justify-content: space-between; gap: 12px; }
.file-item.failed .fi-status { color: var(--err); }

.link-row { display: flex; gap: 8px; margin-top: 12px; }
.link-row input {
  flex: 1; min-width: 0;
  font: 0.92rem var(--mono);
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
}

/* 버튼 */
.btn {
  display: inline-block;
  font: 700 1rem var(--font);
  color: var(--accent-ink);
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 11px 22px;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn:focus-visible, .link-btn:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 2px; }
.btn-ghost { color: var(--ink); background: transparent; border-color: var(--line); }
.btn-sm { padding: 8px 14px; font-size: 0.9rem; }
.link-btn { background: none; border: 0; padding: 0; font: inherit; color: var(--muted); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }

/* 다운로드 카드 */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 16px; margin: 0 0 24px; }
.meta dt { color: var(--muted); font-size: 0.85rem; }
.meta dd { margin: 0; font-size: 1.1rem; font-weight: 700; }

.foot { padding-top: 16px; padding-bottom: 28px; color: var(--muted); font-size: 0.85rem; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* 광고 배너: 업로드 영역 아래, 가로로 긴 배너를 세로로 최대 3개까지 쌓음 */
.ads {
    display: grid;
    gap: 16px;
    margin-top: 32px;
}

.ad-slot {
    width: 100%;
    min-height: 90px; /* 728x90 리더보드 기준 */
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 8px;
}

    .ad-slot > * {
        max-width: 100%;
    }

    .ad-slot.is-placeholder {
        border: 1px dashed var(--line);
        color: var(--muted);
        font-size: 0.85rem;
    }

@media (max-width: 600px) {
    .ad-slot {
        min-height: 100px;
    }
    /* 모바일 320x100 배너 */
}

/* 상단 메뉴 */
.nav { margin-left: auto; display: flex; gap: 20px; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }
.nav a:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 3px; border-radius: 4px; }

@media (max-width: 600px) {
  .top { flex-wrap: wrap; row-gap: 10px; }
  .tagline { display: none; }
  .nav { gap: 16px; }
}

/* 안내/문의 페이지 본문 */
.prose h2 { margin: 28px 0 10px; font-size: 1.15rem; letter-spacing: -0.02em; }
.prose h2:first-child { margin-top: 0; }
.prose ol, .prose ul { margin: 0 0 8px; padding-left: 1.3em; }
.prose li { margin-bottom: 8px; }
.prose p { margin: 0 0 12px; }
.prose a:not(.btn) { color: var(--accent); text-underline-offset: 3px; }
.prose code { font-family: var(--mono); font-size: 0.9em; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }
.prose .mail { font-size: 1.2rem; font-weight: 700; }
.prose .note { color: var(--muted); font-size: 0.9rem; margin-top: 20px; }