/* ============================================================
   P2P Transfer Dashboard — Main Stylesheet
   Dark theme, responsive, modern professional
   ============================================================ */

/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-base:        #0f1117;
  --bg-card:        #1e2130;
  --bg-card-hover:  #252a3a;
  --bg-elevated:    #2a2f45;
  --bg-overlay:     rgba(10, 11, 16, 0.82);

  --accent-blue:    #3b82f6;
  --accent-blue-dim:#1d4ed8;
  --accent-green:   #22c55e;
  --accent-yellow:  #eab308;
  --accent-red:     #ef4444;
  --accent-gray:    #6b7280;
  --accent-self:    #a855f7;

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #475569;

  --border:         #2d3553;
  --border-focus:   #3b82f6;

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  18px;

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.45);
  --shadow-modal:0 8px 48px rgba(0, 0, 0, 0.7);

  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --transition-fast: 140ms ease;
  --transition-mid:  240ms ease;

  --header-h: 64px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background-color: var(--bg-base);
  color: var(--text-primary);
  min-height: 100dvh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

button:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* ── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-gray); }

/* ══════════════════════════════════════════════════════════
   LAYOUT — #app
   ══════════════════════════════════════════════════════════ */

#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* ── Header ───────────────────────────────────────────────── */
header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--header-h);
  background: rgba(15, 17, 23, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
}

.brand {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.server-info {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

#server-ip {
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  padding: 4px 10px;
  border-radius: 99px;
  border: 1px solid var(--border);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
  letter-spacing: 0.03em;
}

#btn-qr {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  flex-shrink: 0;
}

#btn-qr:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

#btn-qr svg {
  width: 18px;
  height: 18px;
  pointer-events: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

#btn-tv-mode {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

#btn-tv-mode:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

#btn-tv-mode.active {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

/* ── Main content ─────────────────────────────────────────── */
main {
  flex: 1;
  padding: 28px 24px 48px;
  display: flex;
  flex-direction: column;
  gap: 36px;
  max-width: 1440px;
  width: 100%;
  margin-inline: auto;
}

/* ── Section headings ─────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.badge-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  border-radius: 99px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1;
}

/* ══════════════════════════════════════════════════════════
   LOBBY — Device Grid
   ══════════════════════════════════════════════════════════ */

#lobby-section {}

#device-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

/* ── Device card ──────────────────────────────────────────── */
.device-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 16px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
  user-select: none;
}

.device-card:hover:not(.busy) {
  background: var(--bg-card-hover);
  border-color: rgba(59, 130, 246, 0.45);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.device-card.selected {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* Self device */
.device-card.self {
  border-color: rgba(168, 85, 247, 0.5);
  cursor: default;
}

.device-card.self:hover {
  transform: none;
  box-shadow: none;
  border-color: rgba(168, 85, 247, 0.5);
}

.self-label {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-self);
  background: rgba(168, 85, 247, 0.12);
  padding: 2px 7px;
  border-radius: 99px;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

/* Busy state */
.device-card.busy {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* Icon */
.device-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}

.device-card:hover:not(.busy) .device-icon,
.device-card.selected .device-icon {
  color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.12);
}

.device-card.self .device-icon {
  color: var(--accent-self);
  background: rgba(168, 85, 247, 0.12);
}

.device-icon svg {
  width: 28px;
  height: 28px;
}

/* Device name (inline-editable for self) */
.device-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.device-name[contenteditable="true"] {
  outline: none;
  border-bottom: 1px dashed var(--accent-self);
  padding-bottom: 1px;
  cursor: text;
  white-space: nowrap;
  overflow: hidden;
}

/* Status badge */
.status-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-gray);
  flex-shrink: 0;
}

.status-dot.online {
  background: var(--accent-green);
  box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2);
  animation: pulse-green 2.4s ease infinite;
}

.status-dot.busy {
  background: var(--accent-yellow);
  box-shadow: 0 0 0 2px rgba(234, 179, 8, 0.2);
}

@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2); }
  50%       { box-shadow: 0 0 0 5px rgba(34, 197, 94, 0.0); }
}

/* Device type label */
.device-type {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ── Empty state ──────────────────────────────────────────── */
.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 56px 24px;
  color: var(--text-muted);
  text-align: center;
}

.empty-state svg {
  width: 48px;
  height: 48px;
  opacity: 0.35;
}

.empty-state p {
  font-size: 0.9rem;
}

/* ══════════════════════════════════════════════════════════
   TRANSFERS
   ══════════════════════════════════════════════════════════ */

#transfers-section {
  display: none;
}

#transfers-section.visible {
  display: block;
}

#transfer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── Transfer card ────────────────────────────────────────── */
.transfer-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: var(--radius-md);
  padding: 14px 46px 14px 16px;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto auto;
  gap: 6px 12px;
  transition: border-color var(--transition-fast);
}

/* Status color on left border */
.transfer-card[data-status="pending"]   { border-left-color: var(--accent-yellow); }
.transfer-card[data-status="active"]    { border-left-color: var(--accent-blue); }
.transfer-card[data-status="done"]      { border-left-color: var(--accent-green); }
.transfer-card[data-status="failed"]    { border-left-color: var(--accent-red); }
.transfer-card[data-status="cancelled"] { border-left-color: var(--accent-gray); }

/* File info row */
.transfer-file-info {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.transfer-file-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.transfer-file-size {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Route row */
.transfer-route {
  font-size: 0.76rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.transfer-route .arrow {
  color: var(--text-muted);
}

.transfer-route .peer {
  font-weight: 500;
  color: var(--text-primary);
}

/* Progress area */
.transfer-progress-area {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.progress-bar-track {
  width: 100%;
  height: 5px;
  background: var(--bg-elevated);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 99px;
  background: var(--accent-blue);
  transition: width 300ms ease, background var(--transition-fast);
  min-width: 0;
  max-width: 100%;
}

.transfer-card[data-status="done"]      .progress-bar-fill { background: var(--accent-green); }
.transfer-card[data-status="failed"]    .progress-bar-fill { background: var(--accent-red); }
.transfer-card[data-status="cancelled"] .progress-bar-fill { background: var(--accent-gray); }
.transfer-card[data-status="pending"]   .progress-bar-fill { background: var(--accent-yellow); }

.transfer-meta {
  display: flex;
  align-items: center;
  gap: 14px;
}

.transfer-percent {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

.transfer-speed,
.transfer-eta {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.transfer-status-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 99px;
  flex-shrink: 0;
}

.transfer-card[data-status="pending"]   .transfer-status-label { color: var(--accent-yellow); background: rgba(234,179,8,0.1); }
.transfer-card[data-status="active"]    .transfer-status-label { color: var(--accent-blue);   background: rgba(59,130,246,0.1); }
.transfer-card[data-status="done"]      .transfer-status-label { color: var(--accent-green);  background: rgba(34,197,94,0.1); }
.transfer-card[data-status="failed"]    .transfer-status-label { color: var(--accent-red);    background: rgba(239,68,68,0.1); }
.transfer-card[data-status="cancelled"] .transfer-status-label { color: var(--accent-gray);   background: rgba(107,114,128,0.1); }

/* Cancel button */
.btn-cancel-transfer {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.btn-cancel-transfer:hover {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
}

.transfer-card[data-status="done"] .btn-cancel-transfer,
.transfer-card[data-status="failed"] .btn-cancel-transfer,
.transfer-card[data-status="cancelled"] .btn-cancel-transfer {
  color: var(--text-muted);
}

.transfer-card[data-status="done"] .btn-cancel-transfer:hover,
.transfer-card[data-status="failed"] .btn-cancel-transfer:hover,
.transfer-card[data-status="cancelled"] .btn-cancel-transfer:hover {
  background: rgba(107,114,128,0.12);
  color: var(--text-secondary);
}

/* Save File button (appears on completed receive transfers) */
.btn-save-file {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  padding: 6px 14px;
  border: none;
  border-radius: 6px;
  background: var(--accent-blue);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), opacity var(--transition-fast);
}
.btn-save-file:hover  { background: #2563eb; }
.btn-save-file:disabled { opacity: 0.6; cursor: default; }

/* ── Device name edit ──────────────────────────────────── */
.device-name-row {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
}

.btn-edit-name {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  padding: 3px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-muted, #888);
  opacity: 0.5;
  transition: opacity 0.15s, color 0.15s;
  flex-shrink: 0;
}
.btn-edit-name svg { width: 13px; height: 13px; display: block; }
.device-card.self:hover .btn-edit-name,
.btn-edit-name:focus    { opacity: 1; color: var(--accent, #a78bfa); }
.btn-edit-name:hover    { opacity: 1; color: var(--accent, #a78bfa); }

/* ══════════════════════════════════════════════════════════
   QR CONTAINER
   ══════════════════════════════════════════════════════════ */

#qr-container {
  display: none;
  position: fixed;
  z-index: 500;
  top: calc(var(--header-h) + 10px);
  right: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-modal);
  flex-direction: column;
  align-items: center;
  gap: 14px;
  animation: fade-scale-in 160ms ease forwards;
}

#qr-container.visible {
  display: flex;
}

#qr-canvas {
  display: block;
  border-radius: var(--radius-sm);
  background: #fff;
  padding: 8px;
}

.qr-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 180px;
  line-height: 1.4;
}

#btn-close-qr {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 6px 18px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  transition: background var(--transition-fast), color var(--transition-fast);
}

#btn-close-qr:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

/* ══════════════════════════════════════════════════════════
   MODAL
   ══════════════════════════════════════════════════════════ */

#modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 900;
  background: var(--bg-overlay);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
  padding: 20px;
}

#modal-overlay.visible {
  display: flex;
}

#modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 32px 24px;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-modal);
  animation: fade-scale-in 180ms ease forwards;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

#modal-box h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

#modal-message {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

#modal-message strong {
  color: var(--text-primary);
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

#btn-accept,
#btn-decline {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 9px 22px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#btn-accept {
  background: var(--accent-blue);
  color: #fff;
}

#btn-accept:hover {
  background: var(--accent-blue-dim);
  transform: translateY(-1px);
}

#btn-decline {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

#btn-decline:hover {
  background: rgba(239, 68, 68, 0.12);
  color: var(--accent-red);
  border-color: rgba(239, 68, 68, 0.35);
}

/* ══════════════════════════════════════════════════════════
   DROP OVERLAY
   ══════════════════════════════════════════════════════════ */

.drop-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 800;
  background: rgba(10, 11, 18, 0.88);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 18px;
  color: var(--accent-blue);
  pointer-events: none;
  border: 3px dashed rgba(59, 130, 246, 0.55);
  border-radius: var(--radius-lg);
  margin: 12px;
}

.drop-overlay.visible {
  display: flex;
}

.drop-overlay svg {
  width: 64px;
  height: 64px;
  opacity: 0.75;
  animation: bounce-up 0.8s ease infinite alternate;
}

.drop-overlay span {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.drop-overlay small {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 400;
}

@keyframes bounce-up {
  from { transform: translateY(0); }
  to   { transform: translateY(-10px); }
}

/* ══════════════════════════════════════════════════════════
   TOAST NOTIFICATIONS
   ══════════════════════════════════════════════════════════ */

#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  min-width: 240px;
  max-width: 340px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  box-shadow: var(--shadow-card);
  animation: toast-in 220ms ease forwards;
}

.toast.dismissing {
  animation: toast-out 220ms ease forwards;
}

.toast-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 1px;
}

.toast-icon svg {
  width: 18px;
  height: 18px;
}

.toast-body {
  flex: 1;
  min-width: 0;
}

.toast-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.toast-message {
  font-size: 0.76rem;
  color: var(--text-secondary);
  margin-top: 2px;
  line-height: 1.4;
}

/* Toast variants */
.toast[data-type="success"] { border-left: 3px solid var(--accent-green); }
.toast[data-type="success"] .toast-icon { color: var(--accent-green); }

.toast[data-type="error"]   { border-left: 3px solid var(--accent-red); }
.toast[data-type="error"]   .toast-icon { color: var(--accent-red); }

.toast[data-type="warning"] { border-left: 3px solid var(--accent-yellow); }
.toast[data-type="warning"] .toast-icon { color: var(--accent-yellow); }

.toast[data-type="info"]    { border-left: 3px solid var(--accent-blue); }
.toast[data-type="info"]    .toast-icon { color: var(--accent-blue); }

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(32px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateX(32px) scale(0.96);
  }
}

/* ══════════════════════════════════════════════════════════
   SPINNER
   ══════════════════════════════════════════════════════════ */

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--bg-elevated);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

.spinner.sm {
  width: 14px;
  height: 14px;
  border-width: 2px;
}

.spinner.lg {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ══════════════════════════════════════════════════════════
   ANIMATIONS — shared
   ══════════════════════════════════════════════════════════ */

@keyframes fade-scale-in {
  from {
    opacity: 0;
    transform: scale(0.94);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ══════════════════════════════════════════════════════════
   TV MODE
   ══════════════════════════════════════════════════════════ */

body.tv-mode {
  font-size: 18px;
}

body.tv-mode header {
  height: 80px;
  padding: 0 48px;
}

body.tv-mode .brand {
  font-size: 1.5rem;
}

body.tv-mode main {
  padding: 40px 48px 64px;
}

body.tv-mode #device-grid {
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

body.tv-mode .device-card {
  padding: 28px 20px 24px;
}

body.tv-mode .device-icon {
  width: 68px;
  height: 68px;
}

body.tv-mode .device-icon svg {
  width: 36px;
  height: 36px;
}

body.tv-mode .device-name {
  font-size: 1rem;
}

body.tv-mode .transfer-card {
  padding: 18px 56px 18px 20px;
}

/* ══════════════════════════════════════════════════════════
   RESPONSIVE — tablet (< 1024px)
   ══════════════════════════════════════════════════════════ */

@media (max-width: 1023px) {
  #device-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  body.tv-mode #device-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  main {
    padding: 20px 16px 40px;
  }

  header {
    padding: 0 16px;
  }

  #server-ip {
    max-width: 160px;
  }

  #qr-container {
    right: 16px;
  }
}

/* ══════════════════════════════════════════════════════════
   RESPONSIVE — mobile (< 640px)
   ══════════════════════════════════════════════════════════ */

@media (max-width: 639px) {
  :root {
    --header-h: 56px;
  }

  #device-grid {
    grid-template-columns: 1fr;
  }

  body.tv-mode #device-grid {
    grid-template-columns: 1fr;
  }

  header {
    padding: 0 12px;
    gap: 10px;
  }

  .brand {
    font-size: 1rem;
  }

  #server-ip {
    max-width: 110px;
    font-size: 0.72rem;
  }

  #btn-tv-mode {
    display: none;
  }

  main {
    padding: 16px 12px 36px;
    gap: 24px;
  }

  .section-header h2 {
    font-size: 0.92rem;
  }

  .device-card {
    flex-direction: row;
    align-items: center;
    padding: 14px 12px;
    gap: 12px;
  }

  .device-card .self-label {
    top: 8px;
    right: 8px;
  }

  .device-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
  }

  .device-icon svg {
    width: 22px;
    height: 22px;
  }

  .device-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
  }

  .device-name {
    text-align: left;
    font-size: 0.88rem;
  }

  .device-type {
    font-size: 0.65rem;
  }

  #modal-box {
    padding: 22px 20px 18px;
  }

  .modal-actions {
    flex-direction: column-reverse;
  }

  #btn-accept,
  #btn-decline {
    width: 100%;
    text-align: center;
    justify-content: center;
  }

  #toast-container {
    bottom: 16px;
    right: 12px;
    left: 12px;
  }

  .toast {
    max-width: 100%;
    min-width: unset;
  }

  #qr-container {
    right: 12px;
    left: 12px;
    top: calc(var(--header-h) + 8px);
  }

  .drop-overlay {
    margin: 6px;
  }

  .drop-overlay span {
    font-size: 1.1rem;
  }

  .transfer-card {
    padding: 12px 44px 12px 14px;
  }
}

/* ══════════════════════════════════════════════════════════
   UTILITY CLASSES
   ══════════════════════════════════════════════════════════ */

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }