* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--tg-theme-bg-color, #1a1a2e);
  color: var(--tg-theme-text-color, #e0e0e0);
  min-height: 100vh;
  padding: 16px;
}

#app {
  max-width: 480px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 24px;
  padding-top: 8px;
}

header h1 {
  font-size: 24px;
  color: var(--tg-theme-text-color, #e0e0e0);
  margin-bottom: 4px;
}

header p {
  font-size: 14px;
  color: var(--tg-theme-hint-color, #888);
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--tg-theme-hint-color, #555);
  border-radius: 16px;
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--tg-theme-secondary-bg-color, rgba(255,255,255,0.05));
  margin-bottom: 16px;
}

.drop-zone:hover, .drop-zone.over {
  border-color: var(--tg-theme-button-color, #4fc3f7);
  background: var(--tg-theme-secondary-bg-color, rgba(79,195,247,0.1));
}

.drop-zone-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.drop-icon {
  font-size: 48px;
  margin-bottom: 4px;
}

.drop-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--tg-theme-text-color, #e0e0e0);
}

.drop-formats {
  font-size: 12px;
  color: var(--tg-theme-hint-color, #666);
  word-break: break-all;
}

.drop-size {
  font-size: 12px;
  color: var(--tg-theme-hint-color, #666);
}

/* Progress */
.progress, .result, .error {
  animation: fadeIn 0.3s ease;
}

.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.progress-card, .result-card, .error-card {
  background: var(--tg-theme-secondary-bg-color, rgba(255,255,255,0.08));
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 16px;
  text-align: center;
}

.file-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  word-break: break-all;
}

.file-size {
  font-size: 13px;
  color: var(--tg-theme-hint-color, #888);
  margin-bottom: 16px;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background: var(--tg-theme-secondary-bg-color, rgba(255,255,255,0.15));
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 12px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--tg-theme-button-color, #4fc3f7);
  border-radius: 4px;
  transition: width 0.5s ease;
  width: 0%;
}

.progress-status {
  font-size: 14px;
  color: var(--tg-theme-hint-color, #888);
}

/* Result */
.result-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.result-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  word-break: break-all;
}

.result-info {
  font-size: 13px;
  color: var(--tg-theme-hint-color, #888);
  margin-bottom: 20px;
}

.download-btn {
  width: 100%;
  padding: 14px 24px;
  background: var(--tg-theme-button-color, #4fc3f7);
  color: var(--tg-theme-button-text-color, #1a1a2e);
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
  margin-bottom: 10px;
}

.download-btn:hover {
  opacity: 0.9;
}

.download-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.secondary-btn {
  width: 100%;
  padding: 12px 24px;
  background: transparent;
  color: var(--tg-theme-button-color, #4fc3f7);
  border: 1px solid var(--tg-theme-button-color, #4fc3f7);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.secondary-btn:hover {
  background: var(--tg-theme-button-color, #4fc3f7);
  color: var(--tg-theme-button-text-color, #1a1a2e);
}

/* Error */
.error-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.error-message {
  font-size: 14px;
  color: var(--tg-theme-text-color, #e0e0e0);
  margin-bottom: 20px;
  word-break: break-word;
}