:root {
  color-scheme: light;
  --bg: #f3efe6;
  --panel: rgba(255, 252, 246, 0.88);
  --panel-strong: #fff9ef;
  --line: rgba(47, 37, 24, 0.12);
  --text: #1f1d1a;
  --muted: #6f675c;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --warm: #f59e0b;
  --danger: #be123c;
  --shadow: 0 20px 50px rgba(51, 34, 12, 0.12);
  --radius: 24px;
  --radius-sm: 16px;
  font-family: "Segoe UI", "Avenir Next", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(245, 158, 11, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(15, 118, 110, 0.16), transparent 32%),
    linear-gradient(180deg, #fcfbf7 0%, var(--bg) 100%);
}

button,
input {
  font: inherit;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.hero,
.panel,
.identity-card,
.device-card,
.transfer-item,
.dropzone {
  backdrop-filter: blur(18px);
}

.hero,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 28px;
  margin-bottom: 24px;
}

.eyebrow,
.panel-label,
.device-meta,
.transfer-meta,
.modal-copy {
  color: var(--muted);
}

.eyebrow,
.panel-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  margin: 0 0 8px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 0.95;
}

.hero-copy {
  margin-top: 14px;
  max-width: 640px;
  line-height: 1.6;
  font-size: 1.05rem;
}

.hero-actions,
.modal-actions {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 24px;
}

.panel {
  padding: 24px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.room-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.status-pill {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  background: rgba(15, 118, 110, 0.12);
  color: var(--accent-strong);
}

.status-pill.offline {
  background: rgba(190, 18, 60, 0.1);
  color: var(--danger);
}

.identity-card,
.qr-card,
.dropzone,
.transfer-item,
.device-card,
.selected-files {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.58);
}

.identity-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
}

.qr-card {
  padding: 18px 20px;
}

.qr-copy {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.qr-body {
  display: flex;
  gap: 18px;
  align-items: center;
}

.qr-image {
  width: 132px;
  height: 132px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  padding: 10px;
  object-fit: contain;
}

.room-link-preview {
  color: var(--muted);
  line-height: 1.5;
  word-break: break-all;
}

.dropzone {
  padding: 28px;
  text-align: center;
  border-style: dashed;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.dropzone.dragover {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: rgba(15, 118, 110, 0.08);
}

.dropzone-title {
  font-size: 1.15rem;
  font-weight: 600;
}

.dropzone-copy {
  margin: 10px auto 18px;
  max-width: 280px;
  line-height: 1.5;
  color: var(--muted);
}

.selected-files {
  padding: 16px 18px;
}

.selected-files.empty {
  color: var(--muted);
}

.selected-file {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
}

.selected-file + .selected-file {
  border-top: 1px solid var(--line);
}

.device-panel {
  min-height: 480px;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.device-card {
  padding: 20px;
  text-align: left;
  display: flex;
  gap: 16px;
  align-items: center;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.device-card:hover,
.device-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(15, 118, 110, 0.35);
  background: rgba(15, 118, 110, 0.07);
  outline: none;
}

.device-avatar {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.85), rgba(15, 118, 110, 0.9));
  flex: 0 0 auto;
}

.device-title {
  margin-bottom: 4px;
}

.device-pulse {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(15, 118, 110, 0.45);
  animation: pulse 1.8s infinite;
}

.transfer-panel {
  margin-top: 24px;
}

.transfer-list {
  display: grid;
  gap: 14px;
}

.transfer-list.empty {
  color: var(--muted);
}

.transfer-item {
  padding: 18px 20px;
}

.transfer-copy {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.progress-track {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: rgba(31, 29, 26, 0.08);
  overflow: hidden;
}

.progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--warm));
  transition: width 120ms linear;
}

.button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  transition: transform 160ms ease, opacity 160ms ease, background 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--accent);
  color: white;
}

.button.secondary {
  background: rgba(15, 118, 110, 0.12);
  color: var(--accent-strong);
}

.button.ghost,
.button.tertiary {
  background: rgba(31, 29, 26, 0.06);
  color: var(--text);
}

.button.danger {
  background: rgba(190, 18, 60, 0.12);
  color: var(--danger);
}

.modal {
  border: 0;
  padding: 0;
  background: transparent;
}

.modal::backdrop {
  background: rgba(17, 24, 39, 0.3);
  backdrop-filter: blur(6px);
}

.modal-card {
  width: min(92vw, 420px);
  padding: 24px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.modal-copy {
  margin: 14px 0 20px;
  line-height: 1.5;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(15, 118, 110, 0.45);
  }
  70% {
    box-shadow: 0 0 0 16px rgba(15, 118, 110, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(15, 118, 110, 0);
  }
}

@media (max-width: 880px) {
  .hero,
  .layout {
    grid-template-columns: 1fr;
    flex-direction: column;
  }

  .hero-actions {
    align-items: stretch;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 18px 14px 32px;
  }

  .hero,
  .panel {
    padding: 18px;
    border-radius: 22px;
  }

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

  .identity-card,
  .qr-copy,
  .qr-body,
  .transfer-copy {
    flex-direction: column;
    align-items: flex-start;
  }
}