@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap");

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-hover: #242424;
  --border: #2a2a2a;
  --border-active: #3a3a3a;
  --text: #e0e0e0;
  --text-muted: #777;
  --text-dim: #555;
  --accent: #d4a574;
  --accent-hover: #e0b88a;
  --accent-dim: rgba(212, 165, 116, 0.15);
  --error: #c45c5c;
  --error-bg: rgba(196, 92, 92, 0.1);
  --success: #5ca05c;
  --success-bg: rgba(92, 160, 92, 0.1);
  --info-bg: rgba(212, 165, 116, 0.08);
  --radius: 8px;
  --radius-sm: 4px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

button,
a,
input,
[role="button"] {
  -webkit-tap-highlight-color: transparent;
  outline: none;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 1.5px solid var(--accent);
  outline-offset: 2px;
}

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;
  align-items: center;
  line-height: 1.5;
}

header {
  width: 100%;
  max-width: 640px;
  padding: 2.5rem 1.5rem 0;
  text-align: center;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.375rem;
}

.logo svg {
  width: 28px;
  height: 28px;
}

.logo h1 {
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.tagline {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

main {
  width: 100%;
  max-width: 640px;
  padding: 0 1.5rem 3rem;
}

.tabs {
  display: flex;
  gap: 2px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 3px;
  margin-bottom: 1.5rem;
}

.tab {
  flex: 1;
  padding: 0.5rem 1rem;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.tab:hover {
  color: var(--text);
}

.tab.active {
  background: var(--surface-hover);
  color: var(--text);
}

.drop-zone {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.drop-zone:hover {
  border-color: var(--border-active);
  background: var(--surface);
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.drop-icon {
  width: 36px;
  height: 36px;
  margin: 0 auto 0.75rem;
  color: var(--text-dim);
}

.drop-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.drop-sublabel {
  font-size: 0.75rem;
  color: var(--text-muted);
}

#file-input {
  display: none;
}

.estimate-area {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.estimate-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: pre-line;
  line-height: 1.6;
}

.progress-area {
  margin-top: 1rem;
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--surface);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.2s ease;
}

.progress-text {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.status-message {
  margin-top: 1rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 500;
}

.status-message.error {
  background: var(--error-bg);
  color: var(--error);
}

.status-message.success {
  background: var(--success-bg);
  color: var(--success);
}

.status-message.info {
  background: var(--info-bg);
  color: var(--accent);
}

.result-area {
  margin-top: 1.5rem;
}

.chunk-notice {
  padding: 0.75rem 1rem;
  background: var(--info-bg);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.image-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 0.75rem;
}

.encoded-image {
  width: 100%;
  max-width: 280px;
  height: auto;
  border-radius: var(--radius-sm);
  image-rendering: pixelated;
  display: block;
  margin: 0 auto 0.75rem;
  background: var(--bg);
}

.image-info {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 0.75rem;
}

.download-btn {
  display: block;
  width: 100%;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s;
}

.download-btn:hover {
  background: var(--accent-hover);
}

.download-all {
  margin-top: 0.5rem;
}

#encode-btn {
  display: block;
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

#encode-btn:hover {
  background: var(--accent-hover);
}

.file-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.file-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}

.file-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.audio-player {
  width: 100%;
  margin-bottom: 1rem;
  border-radius: var(--radius-sm);
  outline: none;
}

.audio-player::-webkit-media-controls-panel {
  background: var(--surface-hover);
}

footer {
  width: 100%;
  max-width: 640px;
  padding: 0 1.5rem 2rem;
  text-align: center;
}

.warning-note {
  font-size: 0.6875rem;
  color: var(--text-dim);
  line-height: 1.6;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.warning-note strong {
  color: var(--text-muted);
  font-weight: 500;
}

.social-links {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
}

.social-link {
  color: var(--text-dim);
  transition: color 0.15s;
  display: inline-flex;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

.social-link:hover {
  color: var(--text-muted);
  background: var(--surface);
}

.social-link:focus-visible {
  outline: 1.5px solid var(--accent);
  outline-offset: -1px;
}

.social-link svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 480px) {
  header {
    padding: 1.5rem 1rem 0;
  }

  main {
    padding: 0 1rem 2rem;
  }

  footer {
    padding: 0 1rem 1.5rem;
  }

  .drop-zone {
    padding: 2rem 1rem;
  }

  .encoded-image {
    max-width: 200px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none;
  }

  .progress-fill {
    transition: none;
  }
}