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

/* ── Theme variables ─────────────────────────────────────────── */
:root {
  --bg:       #f3f1ec;
  --card:     #fdfcf9;
  --border:   #dddad3;
  --text:     #1a1916;
  --muted:    #716e68;
  --dim:      #aaa89f;
  --accent:   #a38bad;
  --accent-h: #8e7399;
  --btn-fg:   #fff;
  --in-bg:    #f8f7f2;
  --in-bd:    #d0cdc6;
  --focus:    #a38bad;
  --code:     #eceae4;
  --ok:       #2a7d43;
  --err:      #bf3535;
  --warn-bg:  #fdf7e4;
  --warn-bd:  #c49012;
  --warn-tx:  #7a5000;
  --ins-bg:   #fff0ef;
  --ins-bd:   #dc4040;
  --ins-tx:   #b02020;
  --prog:     #dddad3;
  --cbg:      #eceae4;
  --cbd:      #d0cdc6;
  --hbg:      #f3f1ec;
  --hbd:      #dddad3;
  --odim:     #cac7be;
}

[data-theme="dark"] {
  --bg:       #0d0d14;
  --card:     #14141e;
  --border:   #272738;
  --text:     #d4d4e0;
  --muted:    #88889a;
  --dim:      #4c4c5e;
  --accent:   #c0a8cc;
  --accent-h: #cdb6d8;
  --btn-fg:   #fff;
  --in-bg:    #0d0d14;
  --in-bd:    #272738;
  --focus:    #c0a8cc;
  --code:     #0d0d14;
  --ok:       #4ade80;
  --err:      #f06060;
  --warn-bg:  #1a160e;
  --warn-bd:  #a07830;
  --warn-tx:  #c8a060;
  --ins-bg:   #2a0f0f;
  --ins-bd:   #e04040;
  --ins-tx:   #f06060;
  --prog:     #272738;
  --cbg:      #1e1e2c;
  --cbd:      #272738;
  --hbg:      #0d0d14;
  --hbd:      #272738;
  --odim:     #2e2e42;
}

/* ── Base ────────────────────────────────────────────────────── */
body {
  font-family: ui-monospace, 'Cascadia Code', 'JetBrains Mono', Menlo, Consolas, monospace;
  background: var(--bg);
  color: var(--text);
  font-size: 13.5px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 2.5rem 1.25rem 4rem;
  margin: 0;
}

/* ── Card ────────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1.5rem 1.75rem 1.75rem;
  width: 100%;
  max-width: 980px;
}

/* ── Header ──────────────────────────────────────────────────── */
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--border);
}

h1 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ── Theme toggle ────────────────────────────────────────────── */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.72rem;
  padding: 0.22rem 0.55rem;
  text-transform: lowercase;
  letter-spacing: 0.03em;
  transition: color 0.15s, border-color 0.15s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--muted); }

/* ── Segmented toggle ────────────────────────────────────────── */
.seg-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
  width: fit-content;
  margin-bottom: 1.4rem;
}

.seg-btn {
  padding: 0.22rem 0.75rem;
  font: inherit;
  font-size: 0.72rem;
  font-weight: 500;
  background: none;
  border: none;
  border-right: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  text-transform: lowercase;
  letter-spacing: 0.03em;
  transition: background 0.12s, color 0.12s;
}
.seg-btn:last-child { border-right: none; }
.seg-btn:hover { color: var(--text); }
.seg-btn.active { background: var(--accent); color: var(--btn-fg); }

/* ── Tabs ────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.tab {
  padding: 0.26rem 0.8rem;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 500;
  background: none;
  border: none;
  border-right: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  text-transform: lowercase;
  transition: background 0.12s, color 0.12s;
}
.tab:last-child { border-right: none; }
.tab:hover { color: var(--text); }
.tab.active { background: var(--accent); color: var(--btn-fg); }

/* ── Insecure context warning ────────────────────────────────── */
.insecure-warning {
  display: none;
  margin-bottom: 1rem;
  padding: 0.65rem 0.85rem;
  background: var(--ins-bg);
  border: 1px solid var(--ins-bd);
  border-radius: 4px;
  font-size: 0.78rem;
  color: var(--ins-tx);
  line-height: 1.5;
}

/* ── Upload 2-column grid ────────────────────────────────────── */
.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1.75rem;
}

@media (max-width: 700px) {
  .upload-grid { grid-template-columns: 1fr; }
}

/* ── Right output column ─────────────────────────────────────── */
.output-col {
  border-left: 1px solid var(--border);
  padding-left: 1.75rem;
}

.output-col-inner {
  max-height: 560px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.output-label {
  font-size: 0.68rem;
  color: var(--odim);
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

@media (max-width: 700px) {
  .output-col {
    border-left: none;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 1.25rem;
    margin-top: 0.5rem;
  }
}

@media (max-width: 500px) {
  body {
    padding: 1rem 0.75rem 3rem;
  }

  .card {
    padding: 1rem 1rem 1.25rem;
  }

  .card-header {
    flex-wrap: wrap;
    gap: 0.6rem;
  }

  .header-right {
    width: 100%;
    justify-content: space-between;
  }

  .output-col-inner {
    max-height: 320px;
  }
}

/* ── Subtitle ────────────────────────────────────────────────── */
.subtitle {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Form labels ─────────────────────────────────────────────── */
label {
  display: block;
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.28rem;
  margin-top: 0.85rem;
}
label.first { margin-top: 0; }

/* ── Field header (label + inline control) ───────────────────── */
.field-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.85rem;
  margin-bottom: 0.28rem;
}
.field-header label,
.field-header label.first { margin: 0; }

#health-btn {
  font: inherit;
  font-size: 0.7rem;
  padding: 0.18rem 0.5rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--muted);
  cursor: pointer;
  text-transform: lowercase;
  transition: color 0.15s, border-color 0.15s;
}
#health-btn:hover { color: var(--text); border-color: var(--muted); }

/* ── Token enable toggle ─────────────────────────────────────── */
.switch-label {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.7rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  text-transform: lowercase;
  letter-spacing: 0.03em;
}
.switch-label input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
  width: auto;
  margin: 0;
}

/* ── Inputs ──────────────────────────────────────────────────── */
input[type="password"],
input[type="file"],
input[type="text"],
input[type="url"] {
  display: block;
  width: 100%;
  padding: 0.48rem 0.65rem;
  font: inherit;
  font-size: 0.87rem;
  background: var(--in-bg);
  border: 1px solid var(--in-bd);
  border-radius: 3px;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
input:focus { border-color: var(--focus); }

input[type="file"] {
  padding: 0.42rem 0.65rem;
  cursor: pointer;
  color: var(--muted);
}
input[type="file"]::file-selector-button {
  background: var(--cbg);
  border: none;
  border-right: 1px solid var(--in-bd);
  color: var(--text);
  cursor: pointer;
  padding: 0.22rem 0.6rem;
  margin-right: 0.6rem;
  font: inherit;
  font-size: 0.75rem;
  border-radius: 0;
}

.hint {
  margin-top: 0.25rem;
  font-size: 0.68rem;
  color: var(--dim);
  line-height: 1.4;
}

/* ── Public network warning ──────────────────────────────────── */
.public-warning {
  margin-bottom: 1rem;
  padding: 0.55rem 0.75rem;
  background: var(--warn-bg);
  border: 1px solid var(--warn-bd);
  border-radius: 3px;
  font-size: 0.77rem;
  color: var(--warn-tx);
  line-height: 1.5;
}

/* ── Progress ────────────────────────────────────────────────── */
.progress-wrap { display: none; margin-top: 0.9rem; }
.progress-wrap.visible { display: block; }

.progress-label {
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: 0.28rem;
  display: flex;
  justify-content: space-between;
}

.progress-track {
  height: 3px;
  background: var(--prog);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 99px;
  transition: width 0.1s linear;
}

/* ── Main button ─────────────────────────────────────────────── */
.btn {
  display: block;
  width: 100%;
  margin-top: 1rem;
  padding: 0.58rem;
  font: inherit;
  font-size: 0.87rem;
  font-weight: 700;
  background: var(--accent);
  color: var(--btn-fg);
  border: none;
  border-radius: 3px;
  cursor: pointer;
  letter-spacing: 0.05em;
  text-transform: lowercase;
  transition: background 0.15s, opacity 0.15s;
}
.btn:hover:not(:disabled) { background: var(--accent-h); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* ── Status messages ─────────────────────────────────────────── */
.status {
  font-size: 0.82rem;
  line-height: 1.6;
  word-break: break-all;
}
.decrypt-form .status { margin-top: 0.85rem; }
.status.error   { color: var(--err); }
.status.success { color: var(--ok); }

.status code {
  display: block;
  margin: 0.32rem 0;
  padding: 0.42rem 0.6rem;
  background: var(--code);
  border: 1px solid var(--border);
  border-radius: 3px;
  font: inherit;
  font-size: 0.76rem;
  word-break: break-all;
}

/* ── Copy row ────────────────────────────────────────────────── */
.copy-row {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  margin: 0.32rem 0;
}
.copy-row code { flex: 1; margin: 0; }

.agent-snippet {
  margin: 0;
  padding: 0.65rem 0.75rem;
  background: var(--code);
  border: 1px solid var(--border);
  border-radius: 3px;
  font: inherit;
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--text);
  white-space: pre;
  overflow-x: auto;
  tab-size: 2;
}

.copy-btn {
  flex-shrink: 0;
  display: inline-block;
  padding: 0.2rem 0.45rem;
  font: inherit;
  font-size: 0.68rem;
  background: var(--cbg);
  color: var(--text);
  border: 1px solid var(--cbd);
  border-radius: 3px;
  cursor: pointer;
  text-transform: lowercase;
  text-decoration: none;
  transition: background 0.12s;
}
.copy-btn:hover { background: var(--border); }
.copy-btn:disabled { opacity: 0.45; cursor: default; }

/* ── Note block ──────────────────────────────────────────────── */
.note {
  margin-top: 0.85rem;
  padding: 0.6rem 0.75rem;
  background: var(--code);
  border-left: 2px solid var(--accent);
  border-radius: 0 3px 3px 0;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Links ───────────────────────────────────────────────────── */
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Upload history ──────────────────────────────────────────── */
#u-history { margin-top: 0; }

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.75rem;
  margin-bottom: 0.45rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.history-item {
  padding: 0.5rem 0.6rem;
  background: var(--hbg);
  border: 1px solid var(--hbd);
  border-radius: 4px;
  margin-bottom: 0.38rem;
}

.history-item code {
  font: inherit;
  font-size: 0.7rem;
  word-break: break-all;
  color: var(--text);
}

.history-actions {
  display: flex;
  gap: 0.28rem;
  flex-wrap: wrap;
  margin-top: 0.32rem;
}

.history-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.32rem;
  font-size: 0.66rem;
  color: var(--dim);
}

.history-rpc {
  margin-top: 0.2rem;
  font-size: 0.65rem;
  color: var(--dim);
  word-break: break-all;
}

/* ── About panel ─────────────────────────────────────────────── */
.about-content { max-width: 680px; }
.about-section { margin-bottom: 1.2rem; }

.about-section h2 {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--muted);
  margin: 0 0 0.45rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.about-steps,
.about-list {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
}

.about-steps li,
.about-list li { margin-bottom: 0.28rem; }

.about-steps li strong,
.about-list li strong { color: var(--text); font-weight: 600; }

.about-list code {
  font: inherit;
  font-size: 0.77rem;
  background: var(--code);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.07em 0.32em;
}

/* ── FAQ ─────────────────────────────────────────────────────── */
.faq { margin: 0; }

.faq dt {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 0.85rem;
  margin-bottom: 0.2rem;
}
.faq dt:first-child { margin-top: 0; }

.faq dd {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
}

.faq dd strong { color: var(--text); font-weight: 600; }

.faq dd code {
  font: inherit;
  font-size: 0.77rem;
  background: var(--code);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.07em 0.32em;
}

/* ── Decrypt panel ───────────────────────────────────────────── */
.decrypt-form { max-width: 480px; }