/* ===== Design tokens ===== */
:root {
  --bg: #f4f5f8;
  --bg-grad: radial-gradient(1200px 600px at 50% -10%, #e9edff 0%, rgba(233, 237, 255, 0) 60%);
  --surface: #ffffff;
  --surface-2: #f7f8fb;
  --border: #e4e7ee;
  --border-strong: #d3d8e3;
  --text: #1c2230;
  --text-soft: #5a6072;
  --text-faint: #8b91a3;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef0fe;
  --green: #16a34a;
  --green-soft: #e7f6ed;
  --amber: #b45309;
  --amber-soft: #fdf2e2;
  --red: #dc2626;
  --red-soft: #fdecec;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
  --shadow-lg: 0 12px 40px rgba(16, 24, 40, 0.16);
  --radius: 14px;
  --radius-sm: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --bg-grad: radial-gradient(1200px 600px at 50% -10%, #1c2140 0%, rgba(28, 33, 64, 0) 60%);
    --surface: #171a23;
    --surface-2: #1e222d;
    --border: #262b38;
    --border-strong: #333a49;
    --text: #e8eaf0;
    --text-soft: #a4abbd;
    --text-faint: #767d90;
    --accent: #7c76ff;
    --accent-hover: #948fff;
    --accent-soft: #21233a;
    --green: #34d17c;
    --green-soft: #16281d;
    --amber: #e0a54a;
    --amber-soft: #2a2114;
    --red: #f87171;
    --red-soft: #2a1717;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 10px 30px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.55);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  background-image: var(--bg-grad);
  background-repeat: no-repeat;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

code { font-family: var(--mono); font-size: 0.88em; }

.app {
  max-width: 860px;
  margin: 0 auto;
  padding: 28px 20px 48px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Header ===== */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}
.brand { display: flex; align-items: center; gap: 13px; }
.logo {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  background: var(--accent);
  color: #fff;
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.brand h1 { margin: 0; font-size: 1.32rem; letter-spacing: -0.02em; }
.tagline { margin: 1px 0 0; font-size: 0.86rem; color: var(--text-soft); }
.tagline code { background: var(--surface-2); padding: 1px 5px; border-radius: 5px; }
.privacy-pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.78rem; font-weight: 600; color: var(--green);
  background: var(--green-soft);
  padding: 7px 12px; border-radius: 999px;
  white-space: nowrap;
}

/* ===== Dropzone ===== */
.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.18s, background 0.18s, transform 0.18s;
  box-shadow: var(--shadow);
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--accent); outline: none; }
.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: scale(1.008);
}
.dropzone-icon { color: var(--accent); margin-bottom: 10px; }
.dropzone h2 { margin: 6px 0 4px; font-size: 1.2rem; }
.dropzone h2 code { background: var(--accent-soft); color: var(--accent); padding: 1px 7px; border-radius: 6px; }
.dz-sub { margin: 0 0 10px; color: var(--text-soft); }
.hint { margin: 0; font-size: 0.8rem; color: var(--text-faint); }
.link-btn {
  background: none; border: none; padding: 0;
  color: var(--accent); font: inherit; font-weight: 600;
  cursor: pointer; text-decoration: underline;
}

/* ===== State panels ===== */
.state-panel {
  text-align: center;
  padding: 48px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.state-panel h2 { margin: 14px 0 6px; }
.state-panel p { color: var(--text-soft); margin: 0 0 18px; }
.spinner {
  width: 38px; height: 38px; margin: 0 auto;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.error-panel .error-icon { color: var(--red); }

/* ===== Summary card ===== */
.summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.summary-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 18px; flex-wrap: wrap;
}
.summary-title { margin: 8px 0 4px; font-size: 1.25rem; letter-spacing: -0.01em; word-break: break-word; }
.summary-meta { margin: 0; color: var(--text-soft); font-size: 0.88rem; }
.summary-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.74rem; font-weight: 700; letter-spacing: 0.02em;
  padding: 5px 10px; border-radius: 999px; text-transform: uppercase;
}
.badge.signed { background: var(--green-soft); color: var(--green); }
.badge.unsigned { background: var(--surface-2); color: var(--text-faint); }

.warnings {
  margin-top: 16px; padding: 12px 14px;
  background: var(--amber-soft); color: var(--amber);
  border-radius: var(--radius-sm); font-size: 0.85rem;
}
.warnings ul { margin: 6px 0 0; padding-left: 18px; }

/* ===== Sections ===== */
.section { margin-top: 26px; }
.section-title {
  margin: 0 0 12px; font-size: 0.95rem; font-weight: 700;
  color: var(--text-soft); text-transform: uppercase; letter-spacing: 0.04em;
  display: flex; align-items: center; gap: 8px;
}
.count-chip {
  background: var(--accent-soft); color: var(--accent);
  font-size: 0.78rem; padding: 2px 9px; border-radius: 999px; font-weight: 700;
  text-transform: none; letter-spacing: 0;
}

/* ===== Signatures ===== */
.sign-list { display: flex; flex-direction: column; gap: 10px; }
.sign-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--green);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.sign-name { font-weight: 650; display: flex; align-items: center; gap: 8px; }
.sign-name svg { color: var(--green); }
.sign-details {
  margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px 18px;
  font-size: 0.82rem; color: var(--text-soft);
}
.sign-details b { color: var(--text); font-weight: 600; }
.mini-badge {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--accent-soft); color: var(--accent);
  padding: 2px 8px; border-radius: 999px; font-size: 0.74rem; font-weight: 600;
}

/* ===== Documents ===== */
.doc-list { display: flex; flex-direction: column; gap: 8px; }
.doc-row {
  display: flex; align-items: center; gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  box-shadow: var(--shadow);
  transition: border-color 0.15s;
}
.doc-row:hover { border-color: var(--border-strong); }
.file-chip {
  flex-shrink: 0;
  width: 46px; height: 46px;
  border-radius: 10px;
  display: grid; place-items: center;
  font-size: 0.62rem; font-weight: 800; letter-spacing: 0.02em;
  color: #fff; text-transform: uppercase;
}
.doc-info { min-width: 0; flex: 1; }
.doc-name { font-weight: 600; font-size: 0.92rem; word-break: break-word; }
.doc-sub { font-size: 0.78rem; color: var(--text-faint); margin-top: 2px; }
.doc-actions { display: flex; gap: 7px; flex-shrink: 0; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  font: inherit; font-weight: 600; font-size: 0.88rem;
  padding: 9px 15px; border-radius: 10px;
  border: 1px solid transparent; cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, opacity 0.15s;
  white-space: nowrap;
}
.btn:disabled { opacity: 0.55; cursor: default; }
.btn-sm { padding: 6px 11px; font-size: 0.82rem; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-secondary { background: var(--surface-2); color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn-ghost { background: transparent; color: var(--text-soft); }
.btn-ghost:hover:not(:disabled) { background: var(--surface-2); color: var(--text); }
.icon-btn {
  background: transparent; border: none; cursor: pointer;
  color: var(--text-soft); padding: 6px; border-radius: 8px; display: grid; place-items: center;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }

/* ===== Tabs (mode switch) ===== */
.tabs {
  display: inline-flex; gap: 4px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 12px; padding: 4px; margin-bottom: 22px;
}
.tab {
  display: inline-flex; align-items: center; gap: 7px;
  font: inherit; font-weight: 600; font-size: 0.9rem;
  color: var(--text-soft); background: transparent; border: none;
  padding: 8px 16px; border-radius: 9px; cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.tab code { background: transparent; padding: 0; }
.tab:hover { color: var(--text); }
.tab.active { background: var(--surface); color: var(--accent); box-shadow: var(--shadow); }
.tab.active code { color: var(--accent); }

.state-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ===== Create / build ===== */
.unsigned-note {
  display: flex; align-items: flex-start; gap: 9px;
  margin-top: 16px; padding: 12px 14px;
  background: var(--amber-soft); color: var(--amber);
  border-radius: var(--radius-sm); font-size: 0.85rem;
}
.unsigned-note svg { flex-shrink: 0; margin-top: 1px; }
.unsigned-note b { font-weight: 700; }

.build-bar {
  display: flex; align-items: flex-end; gap: 14px;
  margin-top: 24px; padding: 18px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); flex-wrap: wrap;
}
.field { display: flex; flex-direction: column; gap: 5px; flex: 1; min-width: 200px; }
.field label { font-size: 0.8rem; font-weight: 600; color: var(--text-soft); }
.field input {
  font: inherit; font-size: 0.92rem; padding: 10px 12px;
  border: 1px solid var(--border-strong); border-radius: 10px;
  background: var(--surface-2); color: var(--text);
}
.field input:focus { outline: none; border-color: var(--accent); }

.doc-remove { color: var(--text-faint); }
.doc-remove:hover { color: var(--red); background: var(--red-soft); }

/* ===== Header right + language toggle ===== */
.header-right { display: flex; align-items: center; gap: 10px; }
.lang-toggle {
  font: inherit; font-weight: 700; font-size: 0.78rem;
  padding: 6px 11px; border-radius: 8px;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text-soft);
  cursor: pointer; transition: border-color 0.15s, color 0.15s;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ===== Documents: filter + selection toolbar ===== */
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.section-head .section-title { margin: 0; }
.doc-filter {
  font: inherit; font-size: 0.85rem; padding: 7px 11px;
  border: 1px solid var(--border-strong); border-radius: 9px;
  background: var(--surface-2); color: var(--text); min-width: 190px;
}
.doc-filter:focus { outline: none; border-color: var(--accent); }
.doc-toolbar { display: flex; align-items: center; gap: 14px; margin-bottom: 10px; flex-wrap: wrap; }
.check { display: inline-flex; align-items: center; gap: 7px; font-size: 0.85rem; color: var(--text-soft); cursor: pointer; user-select: none; }
input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; cursor: pointer; margin: 0; }
.doc-check, .doc-check-spacer { flex-shrink: 0; }
.doc-check-spacer { width: 15px; }

/* ===== Progress bar ===== */
.progress { margin-top: 14px; display: flex; align-items: center; gap: 10px; }
.progress-bar { flex: 1; height: 8px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.progress-bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width 0.2s; }
.progress-label { font-size: 0.78rem; color: var(--text-soft); white-space: nowrap; }

/* ===== Signature trust: honest badge + certificate ===== */
.badge-sub { font-weight: 600; opacity: 0.72; text-transform: none; letter-spacing: 0; }
.verify-note {
  font-size: 0.8rem; color: var(--text-soft);
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 9px 12px; margin-bottom: 10px;
}
.cert-block {
  margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--border);
  display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 0.82rem; color: var(--text-soft);
  align-items: center;
}
.cert-block b { color: var(--text); font-weight: 600; }
.mini-badge.ok { background: var(--green-soft); color: var(--green); }
.mini-badge.warn { background: var(--amber-soft); color: var(--amber); }

/* ===== Preview modal ===== */
.modal { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 20px; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(12, 15, 25, 0.55); backdrop-filter: blur(2px); }
.modal-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: min(920px, 100%);
  height: min(88vh, 100%);
  display: flex; flex-direction: column;
  overflow: hidden;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 13px 16px; border-bottom: 1px solid var(--border);
}
.modal-title { margin: 0; font-size: 0.98rem; word-break: break-word; }
.modal-header-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.modal-body { flex: 1; background: var(--surface-2); overflow: auto; display: grid; }
.modal-body iframe { width: 100%; height: 100%; border: none; background: #fff; }
.modal-body img { max-width: 100%; max-height: 100%; margin: auto; display: block; }
.modal-body pre {
  margin: 0; padding: 18px; width: 100%; overflow: auto;
  font-family: var(--mono); font-size: 0.82rem; line-height: 1.5;
  white-space: pre-wrap; word-break: break-word; color: var(--text);
}
.modal-body audio { margin: auto; width: min(90%, 520px); }
.modal-body video { max-width: 100%; max-height: 100%; margin: auto; display: block; }
.preview-note { text-align: center; font-size: 0.8rem; color: var(--text-faint); padding: 8px; }
.preview-fallback { text-align: center; padding: 48px 24px; color: var(--text-soft); align-self: center; justify-self: center; }
.preview-fallback svg { color: var(--text-faint); margin-bottom: 12px; }
.preview-loading { text-align: center; padding: 48px 24px; color: var(--text-soft); align-self: center; justify-self: center; }

/* ===== Footer ===== */
.site-footer { margin-top: auto; padding-top: 32px; text-align: center; color: var(--text-faint); font-size: 0.8rem; }
.site-footer code { background: var(--surface-2); padding: 1px 5px; border-radius: 5px; }

.hidden { display: none !important; }

@media (max-width: 560px) {
  .summary-head { flex-direction: column; }
  .summary-actions { width: 100%; }
  .btn-primary { flex: 1; justify-content: center; }
  .doc-row { flex-wrap: wrap; }
  .doc-actions { width: 100%; }
  .doc-actions .btn { flex: 1; justify-content: center; }
}