:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #5f6368;
  --border: #d9d9d9;
  --panel: #ffffff;
  --button: #f2f2f2;
  --button-text: #111111;
  --green: #1f8f3a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  line-height: 1.4;
}

.app-shell {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
}

.top-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 600;
}

.progress {
  margin: 0.25rem 0 0;
  font-size: 0.95rem;
  font-weight: 600;
}

.timestamp {
  margin: 0.2rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.menu {
  position: relative;
}

.menu-toggle {
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 0.5rem;
  font-size: 1.25rem;
  cursor: pointer;
}

.menu-panel {
  position: absolute;
  top: 2.8rem;
  right: 0;
  min-width: 8rem;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 0.5rem;
  padding: 0.35rem;
}

.menu-item {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--button);
  color: var(--button-text);
  border-radius: 0.4rem;
  padding: 0.65rem 0.75rem;
  text-align: left;
  font-size: 0.95rem;
  cursor: pointer;
}

.menu-item + .menu-item {
  margin-top: 0.35rem;
}

.main-content {
  display: grid;
  gap: 1rem;
}

.panel {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 0.75rem;
  padding: 0.85rem;
}

label {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.9rem;
  font-weight: 600;
}

textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.7rem;
  resize: vertical;
  font-size: 0.95rem;
  color: var(--text);
  background: #fff;
  margin-bottom: 0.65rem;
}

.file-input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.6rem 0.65rem;
  font-size: 0.95rem;
  color: var(--text);
  background: #fff;
  margin-bottom: 0.45rem;
}

.file-status {
  margin: 0 0 0.65rem;
  font-size: 0.85rem;
  color: var(--muted);
}

textarea:disabled {
  background: #f5f5f5;
  color: #666;
}

button {
  font: inherit;
}

.primary-btn,
.secondary-btn,
.recipient-btn {
  min-height: 48px;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  cursor: pointer;
}

.primary-btn {
  width: 100%;
  background: #111;
  color: #fff;
  padding: 0.7rem 0.8rem;
  font-weight: 600;
}

.primary-btn:disabled {
  background: #7a7a7a;
  border-color: #7a7a7a;
  cursor: not-allowed;
}

.secondary-btn {
  width: 100%;
  background: #fff;
  color: #111;
  padding: 0.7rem 0.8rem;
  font-weight: 600;
}

.row-actions {
  display: grid;
  gap: 0.55rem;
}

.empty-state {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.recipient-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.55rem;
}

.recipient-btn {
  width: 100%;
  background: #e9e9e9;
  color: #111;
  padding: 0.65rem 0.75rem;
  font-weight: 600;
  text-align: center;
}

.recipient-btn.sent {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

@media (min-width: 700px) {
  .app-shell {
    padding: 1.25rem;
  }

  .recipient-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .row-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}