/* ---- CSS Variables ---- */
:root {
  --primary:       #2563eb;
  --primary-dark:  #1d4ed8;
  --primary-light: #dbeafe;
  --danger:        #dc2626;
  --danger-light:  #fee2e2;
  --success:       #16a34a;
  --success-light: #dcfce7;
  --gray-50:       #f9fafb;
  --gray-100:      #f3f4f6;
  --gray-200:      #e5e7eb;
  --gray-300:      #d1d5db;
  --gray-400:      #9ca3af;
  --gray-500:      #6b7280;
  --gray-600:      #4b5563;
  --gray-700:      #374151;
  --gray-800:      #1f2937;
  --gray-900:      #111827;
  --white:         #ffffff;
  --radius:        8px;
  --radius-lg:     12px;
  --shadow:        0 1px 3px rgba(0,0,0,.10), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg:     0 10px 15px -3px rgba(0,0,0,.10), 0 4px 6px -2px rgba(0,0,0,.05);
  --transition:    150ms ease;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
               Ubuntu, Cantarell, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  min-height: 100vh;
  line-height: 1.5;
}
button { cursor: pointer; font-family: inherit; }

/* ---- Login Overlay ---- */
#login-overlay {
  position: fixed; inset: 0;
  background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
}
#login-overlay.hidden { display: none; }

.login-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  width: 100%; max-width: 380px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.login-card .logo {
  font-size: 2rem; margin-bottom: .25rem;
}
.login-card h1 {
  font-size: 1.4rem; font-weight: 700;
  color: var(--gray-900); margin-bottom: .25rem;
}
.login-card p {
  color: var(--gray-500); font-size: .875rem; margin-bottom: 1.75rem;
}
.login-card .field { text-align: left; margin-bottom: 1rem; }
.login-card label {
  display: block; font-size: .8rem; font-weight: 600;
  color: var(--gray-700); margin-bottom: .35rem; text-transform: uppercase;
  letter-spacing: .04em;
}
.login-card input[type=text],
.login-card input[type=password] {
  width: 100%; padding: .625rem .875rem;
  border: 1px solid var(--gray-300); border-radius: var(--radius);
  font-size: .95rem; outline: none; transition: border-color var(--transition);
}
.login-card input:focus { border-color: var(--primary); }
#login-error {
  color: var(--danger); font-size: .85rem;
  margin-bottom: .75rem; min-height: 1.2em;
}
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .45rem;
  background: var(--primary); color: var(--white);
  border: none; border-radius: var(--radius);
  padding: .65rem 1.5rem; font-size: .95rem; font-weight: 600;
  transition: background var(--transition), opacity var(--transition);
  width: 100%;
}
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-primary:disabled { opacity: .55; cursor: not-allowed; }

/* ---- Confirm Modal ---- */
#confirm-overlay {
  position: fixed; inset: 0;
  background: rgba(17,24,39,.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 1100; padding: 1rem;
}
#confirm-overlay.hidden { display: none; }
.confirm-card {
  background: var(--white); border-radius: var(--radius-lg);
  padding: 1.75rem; width: 100%; max-width: 420px;
  box-shadow: var(--shadow-lg);
}
.confirm-card p {
  color: var(--gray-800); font-size: .92rem; line-height: 1.5;
  white-space: pre-line; margin-bottom: 1.5rem;
}
.confirm-actions { display: flex; justify-content: flex-end; gap: .6rem; }
.confirm-actions button {
  border-radius: var(--radius); padding: .55rem 1.1rem;
  font-size: .88rem; font-weight: 600; border: 1px solid transparent;
  transition: all var(--transition);
}
.btn-confirm-cancel { background: var(--white); color: var(--gray-700); border-color: var(--gray-300); }
.btn-confirm-cancel:hover { background: var(--gray-100); }
.btn-confirm-danger { background: var(--danger); color: var(--white); }
.btn-confirm-danger:hover { background: #b91c1c; }

/* ---- App Shell ---- */
#app { display: none; flex-direction: column; min-height: 100vh; }
#app.visible { display: flex; }

header {
  background: var(--white); border-bottom: 1px solid var(--gray-200);
  padding: 0 1.5rem; height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  box-shadow: var(--shadow);
}
.header-brand {
  display: flex; align-items: center; gap: .6rem;
  font-weight: 700; font-size: 1.1rem; color: var(--gray-900);
}
.header-brand span { font-size: 1.3rem; }

.btn-logout {
  display: flex; align-items: center; gap: .4rem;
  background: none; border: 1px solid var(--gray-300);
  border-radius: var(--radius); padding: .4rem .85rem;
  font-size: .85rem; color: var(--gray-600);
  transition: all var(--transition);
}
.btn-logout:hover {
  border-color: var(--danger); color: var(--danger);
  background: var(--danger-light);
}

main {
  flex: 1; padding: 2rem 1.5rem;
  max-width: 1400px; width: 100%; margin: 0 auto;
}

/* ---- Card ---- */
.card {
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg); padding: 1.75rem;
  box-shadow: var(--shadow); margin-bottom: 1.5rem;
}
.card-title {
  font-size: 1rem; font-weight: 700; color: var(--gray-900);
  margin-bottom: 1.25rem; padding-bottom: .75rem;
  border-bottom: 1px solid var(--gray-100);
  display: flex; align-items: center; gap: .5rem;
}

/* ---- Form grid ---- */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 1.25rem;
}
@media (max-width: 600px) { .form-grid { grid-template-columns: 1fr; } }
.form-group { display: flex; flex-direction: column; gap: .35rem; }
.form-group.full { grid-column: 1 / -1; }
.form-group label {
  font-size: .8rem; font-weight: 600; color: var(--gray-700);
  text-transform: uppercase; letter-spacing: .04em;
}
.form-group label .optional {
  font-weight: 400; text-transform: none; letter-spacing: 0;
  color: var(--gray-400); font-size: .78rem; margin-left: .25rem;
}
.form-group select,
.form-group input[type=text] {
  padding: .575rem .875rem; border: 1px solid var(--gray-300);
  border-radius: var(--radius); font-size: .93rem; outline: none;
  transition: border-color var(--transition); background: var(--white);
}
.form-group select:focus,
.form-group input[type=text]:focus { border-color: var(--primary); }
.form-group select:disabled,
.form-group input[type=text]:disabled {
  background: var(--gray-100); color: var(--gray-400);
}

/* ---- Origin gateway code / agent name fields (were inline style="") ---- */
#origin-gateway { text-transform: uppercase; }

/* ---- Validity To field (text input + hidden native date picker) ---- */
.date-input-row { display: flex; align-items: center; gap: .4rem; position: relative; }
.date-input-row input[type=text] { flex: 1; min-width: 0; }
#valid-to-pick-btn {
  flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center;
  width: 2.3rem; height: 2.3rem; background: var(--white);
  border: 1px solid var(--gray-300); border-radius: var(--radius);
  font-size: 1rem; transition: border-color var(--transition), background var(--transition);
}
#valid-to-pick-btn:hover { border-color: var(--primary); background: var(--primary-light); }
#valid-to.invalid { border-color: var(--danger); }
.field-error { color: var(--danger); font-size: .8rem; margin-top: .3rem; display: none; }
.field-error.visible { display: block; }

/* ---- Currency field ---- */
#currency { text-transform: uppercase; }
#currency.invalid { border-color: var(--danger); }
/* Visually hidden, but NOT display:none / visibility:hidden — Chromium's
   showPicker() throws InvalidStateError on an element that "is not being
   rendered", which display:none satisfies. Collapsing to a 0x0 box with
   opacity:0 keeps it in the render tree (showPicker() works) while making
   it invisible and unclickable/untabbable. */
#valid-to-native {
  position: absolute; width: 0; height: 0; padding: 0; margin: 0;
  border: 0; opacity: 0; overflow: hidden; pointer-events: none;
}
/* Hidden by default; JS toggles the .visible class (never a raw inline
   style) so the ID+class rule below reliably wins over .form-group's
   `display: flex` regardless of selector specificity ordering. */
#agent-name-group { display: none; }
#agent-name-group.visible { display: flex; }

/* ---- Drop zone ---- */
#drop-zone {
  border: 2px dashed var(--gray-300); border-radius: var(--radius-lg);
  padding: 2.25rem 1.5rem; text-align: center; cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
}
#drop-zone.drag-over {
  border-color: var(--primary); background: var(--primary-light);
}
#drop-zone .dz-icon { font-size: 2.5rem; color: var(--gray-400); margin-bottom: .5rem; }
#drop-zone p { color: var(--gray-500); font-size: .9rem; }
#drop-zone p strong { color: var(--primary); }
#drop-zone .dz-hint { font-size: .8rem; color: var(--gray-400); margin-top: .4rem; }
#drop-zone input[type=file] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%;
}

/* ---- File list ---- */
#file-list { margin-top: 1rem; display: flex; flex-direction: column; gap: .5rem; }
.file-item {
  display: flex; align-items: center; gap: .85rem;
  background: var(--gray-50); border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: .65rem .85rem;
  animation: slideIn .18s ease;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.file-item .fi-icon { font-size: 1.2rem; flex-shrink: 0; }
.file-item .fi-thumb {
  width: 120px; height: 120px; object-fit: contain;
  border-radius: var(--radius); flex-shrink: 0;
  border: 1px solid var(--gray-200); background: var(--white);
}
.file-item .fi-name {
  flex: 1; font-size: .875rem; color: var(--gray-700);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.file-item .fi-size {
  font-size: .775rem; color: var(--gray-400); flex-shrink: 0;
}
.file-item .fi-remove {
  background: none; border: none; color: var(--gray-400);
  font-size: 1rem; padding: .15rem .35rem; border-radius: 4px;
  transition: color var(--transition), background var(--transition);
  flex-shrink: 0;
}
.file-item .fi-remove:hover { color: var(--danger); background: var(--danger-light); }

/* ---- Submit button ---- */
.submit-row { margin-top: 1.5rem; display: flex; justify-content: flex-end; }
.btn-submit {
  display: inline-flex; align-items: center; gap: .5rem;
  background: var(--primary); color: var(--white);
  border: none; border-radius: var(--radius);
  padding: .7rem 2rem; font-size: .95rem; font-weight: 600;
  transition: background var(--transition), opacity var(--transition);
  min-width: 160px; justify-content: center;
}
.btn-submit:hover:not(:disabled) { background: var(--primary-dark); }
.btn-submit:disabled { opacity: .5; cursor: not-allowed; }

/* ---- Spinner ---- */
.spinner {
  width: 18px; height: 18px;
  border: 2.5px solid rgba(255,255,255,.35);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }
/* Dark-background variant used inside the (light) login button */
.spinner-dark {
  border-top-color: #2563eb;
  border-color: rgba(37,99,235,.3);
}

/* ---- Loading overlay (Tetris) ---- */
#loading-overlay {
  position: fixed; inset: 0; background: rgba(10,10,20,.92);
  backdrop-filter: blur(4px);
  display: none; align-items: center; justify-content: center;
  z-index: 500; flex-direction: column; gap: .75rem;
}
#loading-overlay.visible { display: flex; }
#loading-overlay .tetris-msg {
  color: #94a3b8; font-size: .85rem; margin: 0; letter-spacing: .01em;
}
#loading-overlay .tetris-wrapper {
  display: flex; gap: 1.25rem; align-items: flex-start;
}
#loading-overlay .tetris-container { position: relative; }
#loading-overlay canvas { display: block; border-radius: 4px; }
#tetris-canvas { border: 2px solid #1e3a5f; }
#tetris-next { border: 1px solid #1e3a5f; }
#loading-overlay .tetris-side {
  display: flex; flex-direction: column; gap: .6rem; width: 104px;
}
#loading-overlay .t-panel {
  background: #0f172a; border: 1px solid #1e3a5f;
  border-radius: 6px; padding: .5rem .7rem;
}
#loading-overlay .t-panel h4 {
  font-size: .6rem; text-transform: uppercase; letter-spacing: .09em;
  color: #475569; margin: 0 0 .2rem; font-weight: 600;
}
#loading-overlay .t-panel .val {
  font-size: 1.15rem; font-weight: 700; color: #e2e8f0;
}
#tetris-gameover {
  position: absolute; inset: 0; display: none;
  flex-direction: column; align-items: center; justify-content: center;
  background: rgba(0,0,0,.82); border-radius: 4px; gap: .6rem; z-index: 10;
}
#tetris-gameover h2 { color: #f87171; font-size: 1.3rem; margin: 0; }
#tetris-gameover p { color: #cbd5e1; font-size: .78rem; margin: 0; text-align: center; }
.t-keys { display: flex; flex-direction: column; gap: .2rem; align-items: center; }
.t-keys .kr { display: flex; gap: .2rem; }
.t-keys .kr-note { margin-top: .2rem; font-size: .55rem; color: #475569; }
.t-keys .kr-space { margin-top: .3rem; }
.t-keys .kr-hint { font-size: .52rem; color: #475569; }
.kc {
  background: #1e293b; border: 1px solid #334155; border-bottom-width: 2px;
  border-radius: 4px; color: #cbd5e1; font-size: .6rem; font-weight: 700;
  padding: .18rem .3rem; min-width: 20px; text-align: center; line-height: 1.4;
}
.kc-wide { min-width: 52px; font-size: .52rem; }

/* ---- Error / alert ---- */
.alert {
  border-radius: var(--radius); padding: .85rem 1rem;
  font-size: .88rem; margin-bottom: 1rem; display: none;
}
.alert.visible { display: flex; align-items: flex-start; gap: .6rem; }
.alert-error { background: var(--danger-light); color: var(--danger); border: 1px solid #fca5a5; }
.alert-success { background: var(--success-light); color: var(--success); border: 1px solid #86efac; }
.alert-processing {
  background: var(--primary-light); color: var(--primary-dark);
  border: 1px solid #93c5fd; display: none;
}
.alert-processing.visible { display: flex; align-items: center; gap: .6rem; }
.processing-spinner {
  width: 18px; height: 18px; flex-shrink: 0;
  border: 2.5px solid #93c5fd; border-top-color: var(--primary);
  border-radius: 50%; animation: spin .7s linear infinite;
}
.alert .alert-icon { flex-shrink: 0; font-size: 1.05rem; }
.btn-retry {
  margin-left: auto; flex-shrink: 0; padding: .25rem .75rem;
  font-size: .82rem; font-weight: 600; border-radius: var(--radius);
  border: 1px solid currentColor; background: transparent; color: inherit;
  cursor: pointer; white-space: nowrap;
}
.btn-retry:hover { opacity: .75; }
/* Hidden by default; JS toggles the .visible class (never a raw inline
   style) so this reliably wins regardless of selector specificity. */
#retry-btn { display: none; }
#retry-btn.visible { display: inline-block; }
#toast-success {
  position: fixed; bottom: 1.5rem; left: 50%; transform: translateX(-50%);
  background: var(--success); color: #fff; padding: .6rem 1.2rem;
  border-radius: var(--radius); font-size: .88rem; font-weight: 600;
  box-shadow: 0 2px 12px rgba(0,0,0,.2); opacity: 0;
  transition: opacity .3s; pointer-events: none; z-index: 9999;
}
#toast-success.visible { opacity: 1; }

/* ---- Results ---- */
#results-section { display: none; }
#results-section.visible { display: block; }
.btn-secondary {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .4rem; margin-top: 1.25rem;
  background: none; border: 1px solid var(--gray-300);
  border-radius: var(--radius); padding: .55rem 1.1rem;
  font-size: .88rem; font-weight: 600; color: var(--gray-700);
  transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: .85rem; margin-top: .75rem;
}
.result-item {
  border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 1rem; display: flex; flex-direction: column; align-items: center;
  gap: .6rem; background: var(--gray-50);
  animation: slideIn .22s ease;
}
.result-item .ri-icon { font-size: 2.2rem; }
.result-item .ri-name {
  font-size: .82rem; color: var(--gray-700); text-align: center;
  word-break: break-all; font-weight: 500;
}
.btn-download {
  display: inline-flex; align-items: center; gap: .4rem;
  background: var(--success); color: var(--white);
  border: none; border-radius: var(--radius);
  padding: .45rem 1rem; font-size: .82rem; font-weight: 600;
  transition: background var(--transition);
  width: 100%; justify-content: center;
}
.btn-download:hover { background: #15803d; }

/* ---- Footer ---- */
footer {
  text-align: center; padding: 1rem;
  font-size: .78rem; color: var(--gray-400);
  border-top: 1px solid var(--gray-200);
}

/* ---- Conversions History ---- */
.history-table-wrap { width: 100%; }
table.history-table {
  width: 100%; border-collapse: collapse; font-size: .875rem; table-layout: auto;
}
table.history-table th {
  text-align: left; padding: .5rem .75rem;
  background: var(--gray-50); border-bottom: 2px solid var(--gray-200);
  font-size: .78rem; font-weight: 700; color: var(--gray-600);
  text-transform: uppercase; letter-spacing: .04em; white-space: nowrap;
}
table.history-table th.sortable { cursor: pointer; user-select: none; }
table.history-table th.sortable:hover { color: var(--primary); }
table.history-table td {
  padding: .5rem .75rem; border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700); vertical-align: middle;
}
table.history-table tr:last-child td { border-bottom: none; }
table.history-table tr:hover td { background: var(--gray-50); }
.history-empty {
  text-align: center; padding: 2rem 1rem;
  color: var(--gray-400); font-size: .9rem;
}
.history-pagination {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 1rem; font-size: .85rem; color: var(--gray-500); flex-wrap: wrap; gap: .5rem;
}
.history-pagination .page-controls { display: flex; gap: .5rem; align-items: center; }
.btn-page {
  background: var(--white); border: 1px solid var(--gray-300);
  border-radius: var(--radius); padding: .3rem .65rem;
  font-size: .82rem; color: var(--gray-600);
  transition: all var(--transition);
}
.btn-page:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.btn-page:disabled { opacity: .4; cursor: not-allowed; }
.btn-dl-sm {
  display: inline-flex; align-items: center; gap: .3rem;
  background: var(--success); color: var(--white);
  border: none; border-radius: var(--radius);
  padding: .3rem .7rem; font-size: .78rem; font-weight: 600;
  transition: background var(--transition); white-space: nowrap;
}
.btn-dl-sm:hover { background: #15803d; }
.btn-del-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.9rem; height: 1.9rem; flex: 0 0 auto;
  background: var(--white); color: var(--danger);
  border: 1px solid #fca5a5; border-radius: var(--radius);
  font-size: .95rem; line-height: 1;
  transition: all var(--transition);
}
.btn-del-icon:hover { background: var(--danger-light); }
div.history-actions {
  display: flex; align-items: center; gap: .4rem;
}
.history-file-link {
  color: var(--primary); text-decoration: none; word-break: break-word;
}
.history-file-link:hover { text-decoration: underline; }
.sort-arrow { margin-left: .2rem; font-size: .7rem; }
.history-alert {
  border-radius: var(--radius); padding: .75rem 1rem;
  font-size: .88rem; margin-bottom: 1rem;
  background: var(--danger-light); color: var(--danger);
  border: 1px solid #fca5a5;
  display: flex; align-items: flex-start; gap: .6rem;
}
#history-error { display: none; }