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

:root {
  --bg: #0a0a0a;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(255, 255, 255, 0.2);
  --text: #f5f5f7;
  --text-secondary: rgba(245, 245, 247, 0.5);
  --text-tertiary: rgba(245, 245, 247, 0.3);
  --accent: #0a84ff;
  --accent-hover: #409cff;
  --success: #30d158;
  --error: #ff453a;
  --warning: #ff9f0a;
  --radius: 14px;
  --radius-sm: 10px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --transition: 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Subtle grain texture */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  z-index: 9999;
}

/* Container */
.container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 0 24px;
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
  padding-top: clamp(80px, 15vh, 160px);
}

/* Hero */
.hero {
  text-align: center;
  margin-bottom: 48px;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 12px;
}

.logo-icon {
  color: var(--accent);
  display: flex;
  align-items: center;
}

.logo h1 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.dot {
  color: var(--text-tertiary);
}

.subtitle {
  font-size: 15px;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.1px;
}

/* Input Section */
.input-section {
  width: 100%;
}

.input-wrapper {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
}

.input-wrapper:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px rgba(10, 132, 255, 0.1);
}

.input-icon {
  position: absolute;
  top: 16px;
  left: 16px;
  color: var(--text-tertiary);
  pointer-events: none;
  z-index: 1;
}

textarea {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  padding: 16px 16px 16px 48px;
  resize: none;
  min-height: 96px;
}

textarea::placeholder {
  color: var(--text-tertiary);
}

.btn-convert {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition), transform var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-convert:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-convert:active:not(:disabled) {
  transform: scale(0.96);
}

.btn-convert:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-convert.loading .btn-text {
  display: none;
}

.btn-convert:not(.loading) .btn-loader {
  display: none;
}

.spinner {
  animation: spin 0.8s linear infinite;
}

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

.hint {
  text-align: center;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 12px;
}

/* Queue */
.queue {
  width: 100%;
  margin-top: 48px;
  animation: fadeUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.queue.hidden {
  display: none;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.queue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.queue-header h2 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.2px;
}

.btn-clear {
  background: none;
  border: none;
  color: var(--text-tertiary);
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}

.btn-clear:hover {
  color: var(--text-secondary);
  background: var(--surface);
}

/* Queue Items */
.queue-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.queue-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  animation: fadeUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transition: border-color var(--transition);
}

.queue-item:hover {
  border-color: var(--border-focus);
}

.queue-item-status {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.queue-item-status.pending {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-tertiary);
}

.queue-item-status.processing {
  background: rgba(10, 132, 255, 0.15);
  color: var(--accent);
}

.queue-item-status.done {
  background: rgba(48, 209, 88, 0.15);
  color: var(--success);
}

.queue-item-status.error {
  background: rgba(255, 69, 58, 0.15);
  color: var(--error);
}

.queue-item-info {
  flex: 1;
  min-width: 0;
}

.queue-item-title {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.queue-item-meta {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

.queue-item-actions {
  flex-shrink: 0;
}

.btn-download {
  background: rgba(48, 209, 88, 0.12);
  color: var(--success);
  border: 1px solid rgba(48, 209, 88, 0.2);
  border-radius: 8px;
  padding: 6px 14px;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.btn-download:hover {
  background: rgba(48, 209, 88, 0.2);
}

.btn-download:active {
  transform: scale(0.96);
}

.btn-retry {
  background: rgba(255, 159, 10, 0.12);
  color: var(--warning);
  border: 1px solid rgba(255, 159, 10, 0.2);
  border-radius: 8px;
  padding: 6px 14px;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-retry:hover {
  background: rgba(255, 159, 10, 0.2);
}

/* Progress bar */
.progress-bar {
  margin-top: 6px;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 300ms ease;
}

/* Processing animation */
.processing-ring {
  animation: spin 1s linear infinite;
}

/* Footer */
.footer {
  text-align: center;
  padding: 32px 24px;
}

.footer p {
  font-size: 12px;
  color: var(--text-tertiary);
}

.footer a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition);
}

.footer a:hover {
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 480px) {
  .container {
    padding-top: 60px;
  }

  .logo h1 {
    font-size: 24px;
  }

  .hero {
    margin-bottom: 32px;
  }

  textarea {
    font-size: 14px;
    min-height: 88px;
  }

  .queue {
    margin-top: 32px;
  }
}