/* セキュファイル便 — one stylesheet, no external fonts or frameworks.
   The content security policy blocks anything from another origin, so the
   type stack is deliberately all system fonts. */

:root {
  color-scheme: light dark;

  --accent: #00807f;
  --accent-strong: #006463;
  --accent-soft: #e3f2f1;

  --bg: #f6f7f8;
  --surface: #ffffff;
  --border: #dcdfe3;
  --border-strong: #b9bfc6;

  --text: #1d2327;
  --text-muted: #5c666f;

  --danger: #b3261e;
  --danger-soft: #fdecea;
  --warn-soft: #fff6e0;
  --warn-border: #e6b800;

  --radius: 10px;
  --radius-lg: 14px;
  --shadow: 0 1px 2px rgba(15, 25, 35, .06), 0 4px 14px rgba(15, 25, 35, .06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #3fb8b6;
    --accent-strong: #61cfcd;
    --accent-soft: #123433;

    --bg: #14181b;
    --surface: #1c2125;
    --border: #303840;
    --border-strong: #47525c;

    --text: #e7ebee;
    --text-muted: #9aa5ae;

    --danger: #ef8b84;
    --danger-soft: #3a1f1d;
    --warn-soft: #332b12;
    --warn-border: #8a7118;

    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 14px rgba(0, 0, 0, .3);
  }
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo,
               system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent-strong); }
a:hover { color: var(--accent); }

/* --- header / footer ---------------------------------------------------- */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: .55rem;
  max-width: 44rem;
  margin: 0 auto;
  padding: .9rem 1.25rem;
  color: var(--accent);
  text-decoration: none;
}

.brand-mark { width: 1.75rem; height: 1.75rem; flex: none; }

.brand-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text);
}

.site-footer {
  max-width: 44rem;
  margin: 3rem auto 0;
  padding: 1.5rem 1.25rem 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: .85rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.1rem;
  margin-bottom: .6rem;
}

.footer-org { margin: 0; }

/* --- page --------------------------------------------------------------- */

.page {
  max-width: 44rem;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 0;
}

.page-narrow { max-width: 36rem; }

.page-title {
  margin: 0 0 .6rem;
  font-size: 1.5rem;
  line-height: 1.4;
}

.page-lead {
  margin: 0 0 1.75rem;
  color: var(--text-muted);
}

.prose h2 {
  margin: 2rem 0 .5rem;
  font-size: 1.1rem;
  padding-bottom: .3rem;
  border-bottom: 1px solid var(--border);
}

.prose ul { padding-left: 1.3rem; }
.prose li { margin-bottom: .3rem; }

/* --- drop zone ---------------------------------------------------------- */

.dropzone {
  display: block;
  width: 100%;
  padding: 2.25rem 1.25rem;
  background: var(--surface);
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  outline: none;
}

.dropzone-icon {
  width: 2.75rem;
  height: 2.75rem;
  color: var(--accent);
}

.dropzone-title {
  margin: .5rem 0 .2rem;
  font-weight: 600;
}

.dropzone-hint {
  margin: 0;
  color: var(--text-muted);
  font-size: .85rem;
}

/* A full-window overlay while a drag is in flight, so the target is the whole
   page rather than a small rectangle the user has to aim at. */
.drag-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  background: rgba(0, 128, 127, .12);
  backdrop-filter: blur(2px);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-strong);
  pointer-events: none;
}

/* --- file list ---------------------------------------------------------- */

.file-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.file-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .7rem .85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: .5rem;
}

.file-name {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
  font-size: .95rem;
}

.file-size {
  flex: none;
  color: var(--text-muted);
  font-size: .85rem;
  font-variant-numeric: tabular-nums;
}

.file-state {
  flex: none;
  font-size: .8rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.file-state.is-done { color: var(--accent); }
.file-state.is-error { color: var(--danger); }

.file-remove,
.file-download {
  flex: none;
  padding: .3rem .7rem;
  font-size: .8rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.file-download {
  border-color: var(--accent);
  color: var(--accent-strong);
  font-weight: 600;
}

.file-remove:hover { border-color: var(--danger); color: var(--danger); }
.file-download:hover { background: var(--accent-soft); }

.total-line {
  margin: .25rem 0 0;
  color: var(--text-muted);
  font-size: .85rem;
}

/* --- form controls ------------------------------------------------------ */

.options {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (min-width: 34rem) {
  .options { grid-template-columns: 1fr 1fr; }
}

.field { margin-bottom: 1.25rem; }

.field label {
  display: block;
  margin-bottom: .3rem;
  font-size: .9rem;
  font-weight: 600;
}

.field-hint {
  margin: .35rem 0 0;
  color: var(--text-muted);
  font-size: .8rem;
  line-height: 1.6;
}

select,
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: .6rem .7rem;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
}

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

.password-row,
.copy-row {
  display: flex;
  gap: .5rem;
}

.password-row input,
.copy-row input {
  flex: 1 1 auto;
  min-width: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .04em;
}

/* --- buttons ------------------------------------------------------------ */

.btn-primary {
  display: inline-block;
  width: 100%;
  padding: .8rem 1.25rem;
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
}

.btn-primary:hover { background: var(--accent-strong); color: #fff; }

.btn-primary:disabled {
  background: var(--border-strong);
  cursor: not-allowed;
}

.btn-ghost,
.btn-copy {
  flex: none;
  padding: .6rem 1rem;
  font: inherit;
  font-size: .9rem;
  color: var(--accent-strong);
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  cursor: pointer;
}

.btn-ghost:hover,
.btn-copy:hover { background: var(--accent-soft); }

.btn-copy.is-copied {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

/* --- panels ------------------------------------------------------------- */

.panel {
  margin-top: 1.5rem;
  padding: 1.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.panel-title {
  margin: 0 0 .9rem;
  font-size: 1.1rem;
}

.panel-result { border-color: var(--accent); }

.result-field { margin-bottom: 1rem; }

.result-field label {
  display: block;
  margin-bottom: .3rem;
  font-size: .85rem;
  font-weight: 600;
}

.result-meta {
  margin: .5rem 0 0;
  color: var(--text-muted);
  font-size: .85rem;
}

.download-actions { margin-top: 1.25rem; }

/* --- progress ----------------------------------------------------------- */

.progress-bar {
  height: .6rem;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 999px;
  transition: width .2s ease-out;
}

.progress-text {
  margin: .7rem 0 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.progress-detail {
  margin: .2rem 0 1rem;
  color: var(--text-muted);
  font-size: .85rem;
  font-variant-numeric: tabular-nums;
}

/* --- notices ------------------------------------------------------------ */

.notice {
  margin: 1rem 0 0;
  padding: .8rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: .875rem;
  line-height: 1.65;
}

.notice-warn {
  background: var(--warn-soft);
  border-color: var(--warn-border);
}

.notice-error {
  background: var(--danger-soft);
  border-color: var(--danger);
  color: var(--danger);
  font-weight: 600;
}

/* --- status strip ------------------------------------------------------- */

.status-strip {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: .85rem;
}

.status-title {
  margin: 0 0 .4rem;
  font-size: .85rem;
  font-weight: 700;
  color: var(--text);
}

.status-strip p { margin: .2rem 0; }
.status-note { font-size: .8rem; }

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

/* --- password embed checkbox + copyable message ------------------------- */

/* Selector is specific enough to beat the generic ".field label" rule, which
   would otherwise force these label-wrapped checkbox rows to display:block. */
.field .check-line,
.check-line {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin: .6rem 0 0;
  padding: .8rem .9rem;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 400;
  line-height: 1.5;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}

.check-line:hover,
.check-line:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.field .check-line input[type="checkbox"],
.check-line input[type="checkbox"] {
  flex: none;
  width: 1.35rem;
  height: 1.35rem;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

textarea#share-message {
  display: block;
  width: 100%;
  min-height: 8rem;
  padding: .7rem .8rem;
  font: inherit;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  resize: vertical;
  margin-bottom: .5rem;
  box-sizing: border-box;
}

.btn-copy-block {
  display: block;
  width: 100%;
}

/* --- recipient delete ---------------------------------------------------- */

.delete-box {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.btn-danger {
  color: var(--danger);
  border-color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger-soft);
}

/* --- disk usage bar + ad slot ------------------------------------------- */

.usage-bar {
  height: .6rem;
  background: var(--border-strong);
  border-radius: 999px;
  overflow: hidden;
  margin: .3rem 0 .7rem;
}

.usage-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
  transition: width .3s;
}

.ad-slot {
  margin: 2rem 0 0;
  min-height: 90px;
  text-align: center;
}

/* --- share QR ----------------------------------------------------------- */

.share-qr {
  width: 180px;
  max-width: 60%;
  margin: .25rem 0;
  background: #fff;
  padding: .5rem;
  border-radius: var(--radius);
}
.share-qr svg { display: block; width: 100%; height: auto; }