* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  min-height: 100vh;
  background: linear-gradient(135deg, #050505 0%, #111111 100%);
  color: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
}

.credit {
  position: absolute;
  left: 16px;
  bottom: 16px;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.credit:hover {
  color: #ffffff;
}

.app-shell {
  width: min(860px, 100%);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  border-radius: 24px;
  padding: 28px;
  backdrop-filter: blur(18px);
}

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

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.78rem;
  color: #bdbdbd;
  margin: 0 0 6px;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(1.8rem, 3vw, 2.7rem);
}

.hero-copy {
  margin: 0;
  color: #c9c9c9;
  max-width: 560px;
}

.pill {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: #ffffff;
  color: #121212;
  font-weight: 700;
  white-space: nowrap;
}

.card-grid {
  display: grid;
  gap: 16px;
}

.panel {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px;
  border-radius: 18px;
}

h2 {
  font-size: 1.05rem;
  margin-top: 0;
  margin-bottom: 12px;
}

button,
input[type="file"] {
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 15px;
}

button {
  background: #f5f5f5;
  color: #080808;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.2s ease, background 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
  background: #ffffff;
}

.hidden {
  display: none;
}

.join-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.join-row input,
#share-link {
  flex: 1;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: #0d0d0d;
  color: #f5f5f5;
}

.share-row {
  display: flex;
  gap: 10px;
}

#copy-link-btn {
  white-space: nowrap;
}

#share-box {
  margin-top: 12px;
}

#share-box label {
  display: block;
  margin-bottom: 6px;
  color: #c7c7c7;
}

#share-code-box {
  margin-top: 12px;
}

#share-code,
#share-code-box input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: #0d0d0d;
  color: #f5f5f5;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  font-size: 1.1rem;
  font-weight: 700;
  text-align: center;
}

#copy-code-btn {
  white-space: nowrap;
}

#status {
  color: #d8d8d8;
  margin-bottom: 12px;
}

#progress-wrap {
  height: 10px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 12px;
}

#progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #ffffff, #bdbdbd);
  transition: width 0.15s ease;
}

.file-label {
  display: inline-block;
  margin-bottom: 10px;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 10px 14px;
  border-radius: 12px;
}

#file-info {
  margin-top: 10px;
  color: #d0d0d0;
}

@media (max-width: 640px) {
  body {
    padding: 12px;
  }

  .app-shell {
    padding: 18px;
  }

  .hero {
    flex-direction: column;
    align-items: flex-start;
  }

  .join-row {
    flex-direction: column;
  }
}