:root { color-scheme: light; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #182230; background: #f3f6fa; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at top, #fff 0, #f3f6fa 48rem); }
.shell { width: min(680px, calc(100% - 28px)); margin: 0 auto; padding: 7vh 0 36px; }
.card { background: #fff; border: 1px solid #e4e9f0; border-radius: 20px; box-shadow: 0 18px 60px rgba(24, 34, 48, .09); padding: clamp(24px, 5vw, 44px); }
.mark { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 14px; background: #1769e0; color: #fff; font-size: 28px; font-weight: 700; }
h1 { margin: 22px 0 8px; font-size: clamp(26px, 5vw, 36px); letter-spacing: -.025em; }
.intro { margin: 0 0 28px; color: #617084; line-height: 1.55; }
.drop-zone { min-height: 190px; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 8px; padding: 28px; border: 2px dashed #b8c6d8; border-radius: 16px; background: #f9fbfd; cursor: pointer; text-align: center; transition: .18s ease; }
.drop-zone:hover, .drop-zone:focus-within, .drop-zone.drag { border-color: #1769e0; background: #f1f7ff; outline: none; }
.drop-zone input { width: 1px; height: 1px; position: absolute; opacity: 0; }
.drop-zone span { color: #718096; font-size: 14px; }
.selection { margin-top: 24px; }
.selection-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.link-button { border: 0; background: transparent; color: #1769e0; cursor: pointer; }
.file-list { list-style: none; padding: 0; margin: 0 0 18px; display: grid; gap: 10px; }
.file-row { border: 1px solid #e4e9f0; border-radius: 12px; padding: 12px; }
.file-meta { display: flex; justify-content: space-between; gap: 14px; font-size: 14px; }
.file-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.file-size, .file-status { color: #718096; white-space: nowrap; }
.progress { height: 6px; background: #edf1f6; border-radius: 99px; overflow: hidden; margin-top: 9px; }
.progress > span { display: block; height: 100%; width: 0; background: #1769e0; transition: width .15s linear; }
.primary { width: 100%; min-height: 50px; border: 0; border-radius: 12px; background: #1769e0; color: #fff; font: inherit; font-weight: 700; cursor: pointer; }
.primary:disabled { opacity: .55; cursor: wait; }
.notice { margin-top: 22px; border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 5px; }
.notice.error { background: #fff1f1; color: #9d2525; }
.notice.success { background: #edf9f1; color: #1f6a3b; }
.notice code { font-weight: 800; font-size: 15px; }
.privacy { color: #7b8798; font-size: 12px; line-height: 1.5; text-align: center; margin: 18px 30px 0; }
.hidden { display: none !important; }
@media (max-width: 540px) { .shell { padding-top: 14px; } .card { border-radius: 16px; padding: 22px; } .drop-zone { min-height: 160px; } }