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

:root {
  --ink: #201d1d;
  --ink-deep: #0f0000;
  --charcoal: #302c2c;
  --body: #424245;
  --mute: #646262;
  --stone: #6e6e73;
  --ash: #9a9898;
  --canvas: #fdfcfc;
  --surface-soft: #f8f7f7;
  --surface-card: #f1eeee;
  --surface-dark: #201d1d;
  --surface-dark-elevated: #302c2c;
  --on-dark: #fdfcfc;
  --on-dark-mute: #9a9898;
  --hairline: rgba(15,0,0,0.12);
  --hairline-strong: #646262;
  --accent: #007aff;
  --font: 'Berkeley Mono', 'IBM Plex Mono', 'JetBrains Mono', ui-monospace, 'SFMono-Regular', 'Menlo', 'Consolas', 'Liberation Mono', monospace;
}

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

body {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--body);
  background: var(--canvas);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

pre {
  font-family: var(--font);
  font-size: 10px;
  line-height: 1.1;
  overflow: hidden;
}

a {
  color: var(--ink);
  text-decoration: underline;
}

/* ── Nav ── */

.nav {
  border-bottom: 1px solid var(--hairline);
  height: 56px;
  display: flex;
  align-items: center;
}

.nav-inner {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo pre {
  font-size: 7px;
  line-height: 1.05;
  color: var(--ink);
  letter-spacing: -0.5px;
}

.nav-logo {
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
}

.nav-link-active {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.nav-link-mute {
  color: var(--mute);
}

/* ── Hero TUI ── */

.hero-tui {
  background: var(--surface-dark);
  color: var(--on-dark);
  padding: 64px 24px;
}

.hero-tui-inner {
  max-width: 960px;
  margin: 0 auto;
}

.hero-tui-art {
  color: var(--on-dark);
  font-size: 10px;
  line-height: 1.15;
  text-align: center;
  margin-bottom: 32px;
  white-space: pre;
  overflow: hidden;
}

.tui-prompt {
  background: var(--surface-dark-elevated);
  border-radius: 4px;
  padding: 8px 12px;
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 16px;
}

.tui-prompt-pipe {
  color: var(--accent);
}

.tui-prompt-cmd {
  color: var(--on-dark);
  font-weight: 500;
}

.tui-prompt-token {
  background: var(--accent);
  color: #fff;
  padding: 0 8px;
  border-radius: 4px;
  font-size: 14px;
}

.tui-prompt-target {
  color: var(--on-dark-mute);
}

/* ── Sections ── */

.converter-section {
  max-width: 960px;
  width: 100%;
  margin: 96px auto;
  padding: 0 24px;
}

.section-header {
  margin-bottom: 0;
}

.section-label {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.hairline {
  height: 1px;
  background: var(--hairline);
  margin: 12px 0 24px;
}

/* ── Drop zone ── */

.drop-zone {
  border: 1px dashed var(--hairline-strong);
  border-radius: 4px;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

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

.drop-zone-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  color: var(--mute);
}

.drop-icon {
  color: var(--ink);
  font-weight: 700;
  font-size: 24px;
}

.drop-hint {
  font-size: 14px;
  color: var(--ash);
}

/* ── File info ── */

.file-info {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 12px 0;
  font-size: 14px;
}

.file-info-name {
  font-weight: 500;
  color: var(--ink);
}

.file-info-size {
  color: var(--mute);
}

/* ── File previews ── */

.file-previews {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 0;
}

.file-previews[hidden] {
  display: none;
}

.file-preview {
  width: 96px;
  text-align: center;
  position: relative;
}

.file-preview-remove {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  z-index: 1;
}

.file-preview-remove:hover {
  background: var(--surface-card);
}

.clear-all-btn {
  font-family: var(--font);
  font-size: 13px;
  color: var(--mute);
  background: none;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 4px 10px;
  height: 80px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  align-self: center;
  transition: background 0.15s, border-color 0.15s;
}

.clear-all-btn:hover {
  background: var(--surface-soft);
  border-color: var(--ink);
  color: var(--ink);
}

.clear-all-icon {
  font-weight: 700;
  font-size: 16px;
}

.file-preview-img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--hairline);
  display: block;
  margin: 0 auto 4px;
}

.file-preview-name {
  display: block;
  font-size: 11px;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-preview-size {
  display: block;
  font-size: 10px;
  color: var(--ash);
}

/* ── Settings ── */

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 24px 0;
}

.setting {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.setting[hidden] {
  display: none;
}
.size-row {
  display: flex;
  gap: 24px;
}
.size-row .setting {
  flex: 1;
}

.setting-blocked {
  opacity: 0.35;
  pointer-events: none;
}

.setting-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--mute);
}

.select-input {
  font-family: var(--font);
  font-size: 16px;
  background: var(--surface-soft);
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 8px 12px;
  height: 40px;
  cursor: pointer;
  appearance: auto;
}

.select-input:focus {
  background: var(--canvas);
  border-color: var(--ink);
  outline: none;
}

.text-input {
  font-family: var(--font);
  font-size: 16px;
  background: var(--surface-soft);
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 8px 12px;
  height: 40px;
}

.text-input:focus {
  background: var(--canvas);
  border-color: var(--ink);
  outline: none;
}

.quality-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-input {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  background: var(--hairline-strong);
  border-radius: 4px;
  outline: none;
}

.range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border-radius: 50%;
  cursor: pointer;
}

.range-input::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

.quality-value {
  font-size: 14px;
  color: var(--mute);
  min-width: 28px;
  text-align: right;
}

/* ── Buttons ── */

.btn-primary {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 500;
  line-height: 2;
  background: var(--ink);
  color: var(--on-dark);
  border: none;
  border-radius: 4px;
  padding: 4px 20px;
  height: 36px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: background 0.15s;
}

.btn-primary:hover {
  background: var(--ink-deep);
}

.btn-primary:active {
  background: var(--ink-deep);
}

.btn-primary:disabled {
  background: var(--surface-card);
  color: var(--ash);
  cursor: not-allowed;
}

/* ── Result ── */

.result-area {
  margin-top: 24px;
}

.preview-row {
  margin: 24px 0;
  display: flex;
  justify-content: center;
}

.preview-img {
  max-width: 100%;
  max-height: 500px;
  border-radius: 4px;
  border: 1px solid var(--hairline);
}

/* ── Footer ── */

.footer {
  margin-top: auto;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text {
  font-size: 14px;
  color: var(--mute);
}

.footer-links {
  display: flex;
  gap: 12px;
  font-size: 14px;
  color: var(--body);
}

.footer-sep {
  color: var(--hairline-strong);
}

/* ── Responsive ── */

@media (max-width: 768px) {
  .nav-inner {
    padding: 0 16px;
    gap: 16px;
  }

  .nav-logo pre {
    font-size: 4.5px;
  }

  .nav-links {
    display: none;
  }

  .lang-select {
    padding: 8px 12px;
    font-size: 14px;
    min-width: 120px;
  }

  .hero-tui {
    padding: 36px 16px 48px;
    overflow: hidden;
  }

  .hero-tui-art {
    font-size: 7px;
    max-width: 100%;
    overflow: hidden;
  }

  .tui-prompt {
    font-size: 13px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .converter-section {
    margin: 40px auto;
    padding: 0 16px;
  }

  .settings-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .drop-hint {
    font-size: 12px;
  }

  .select-input,
  .text-input {
    height: 44px;
  }

  .btn-primary {
    width: 100%;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    padding: 24px 16px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .nav-inner {
    gap: 10px;
  }

  .nav-logo pre {
    font-size: 3.5px;
  }

  .lang-select {
    padding: 6px 10px;
    font-size: 13px;
  }

  .hero-tui {
    padding: 24px 12px 36px;
    overflow: hidden;
  }

  .hero-tui-art {
    display: none;
  }

  .tui-prompt {
    font-size: 12px;
    justify-content: center;
  }

  .tui-prompt-pipe {
    display: none;
  }

  .drop-zone {
    padding: 28px 16px;
  }

  .drop-zone-content {
    gap: 6px;
  }

  .drop-hint {
    display: none;
  }

  .converter-section {
    margin: 24px auto;
  }

  .file-preview {
    width: 72px;
  }

  .file-preview-img {
    width: 60px;
    height: 60px;
  }

  .file-preview-remove {
    width: 20px;
    height: 20px;
    font-size: 11px;
    top: -6px;
    right: -6px;
  }

  .settings-grid {
    gap: 12px;
  }

  .select-input,
  .text-input {
    height: 44px;
    font-size: 16px;
  }

  .btn-primary {
    height: 44px;
    width: 100%;
  }

  .clear-all-btn {
    height: 60px;
    width: 72px;
  }

  .range-input {
    height: 6px;
  }

  .range-input::-webkit-slider-thumb {
    width: 22px;
    height: 22px;
  }

  .range-input::-moz-range-thumb {
    width: 22px;
    height: 22px;
  }

  .footer-inner {
    padding: 20px 16px;
  }
}

.lang-select {
  font-family: var(--font);
  font-size: 14px;
  background: transparent;
  color: var(--mute);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 6px 10px;
  cursor: pointer;
  margin-left: auto;
}