:root {
  --bg: #050505;
  --fg: #f5f5f5;
  --muted: #8c8c8c;
  --outline: #f5f5f5;
  --accent: #ffffff;
  --grid-line: rgba(255, 255, 255, 0.08);
  --row-height: 64px;
  --font-mono: 'Space Mono', 'IBM Plex Mono', 'Fira Mono', monospace;
}

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

html,
body {
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: clamp(16px, 1.6vw, 22px);
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2rem 1rem 4rem;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(
      to right,
      var(--grid-line) 0,
      var(--grid-line) calc((100vw - 4rem) / 12),
      transparent calc((100vw - 4rem) / 12),
      transparent calc((100vw - 4rem) / 12 + 1px)
    ),
    linear-gradient(var(--grid-line), var(--grid-line));
  background-size: auto, 100% var(--row-height);
  opacity: 0.35;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover,
a:focus {
  outline: 2px solid var(--outline);
  outline-offset: 2px;
}

.grid-wrapper {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  width: min(1200px, 95vw);
  margin: 0 auto;
  border: 2px solid var(--outline);
  background: var(--bg);
  z-index: 1;
}

.grid-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, transparent calc(100% / 12 - 1px), var(--grid-line)),
    linear-gradient(to bottom, transparent calc(var(--row-height) - 1px), var(--grid-line));
  background-size: calc(100% / 12) var(--row-height);
  pointer-events: none;
  opacity: 0.6;
  mix-blend-mode: screen;
}

.grid-item {
  border: 2px solid var(--outline);
  padding: clamp(1.25rem, 2vw, 2rem);
  position: relative;
  background: rgba(5, 5, 5, 0.9);
}

.span-12 { grid-column: span 12; }
.span-8 { grid-column: span 8; }
.span-6 { grid-column: span 6; }
.span-4 { grid-column: span 4; }

@media (max-width: 960px) {
  .span-12,
  .span-8,
  .span-6,
  .span-4 {
    grid-column: span 12;
  }

  body {
    padding: 0.5rem;
  }

  .grid-item {
    padding: 0.5rem 0.75rem;
    border-width: 1px;
  }

  .grid-wrapper {
    border-width: 1px;
  }

  .hero-panel {
    padding: 0.25rem 0.75rem;
  }

  .grid-label {
    font-size: 0.7rem;
  }

  .hero-title {
    font-size: 1.5rem;
    margin-top: 0;
  }

  .panel-heading {
    font-size: 0.85rem;
    margin-bottom: 0.2rem;
    letter-spacing: 0.1em;
  }

  .panel-subhead {
    font-size: 0.75rem;
    margin-bottom: 0.3rem;
  }

  .drop-panel #drop_zone {
    min-height: 80px;
    font-size: 0.95rem;
    padding: 0.75rem;
    border-width: 2px;
  }

  .checkbox-stack {
    font-size: 0.85rem;
  }

  .checkbox-stack input[type="checkbox"] {
    width: 18px;
    height: 18px;
  }

  #quality_control {
    padding-top: 0.5rem;
  }

  #quality_presets {
    gap: 0.3rem;
  }

  #quality_presets label {
    font-size: 0.8rem;
  }

  #quality_presets input[type="radio"] {
    width: 14px;
    height: 14px;
  }

  #upload_progress_bar {
    height: 20px;
  }

  #upload_progress_text {
    font-size: 0.7rem;
  }

  .progress-panel {
    gap: 0.5rem;
    padding: 0.3rem 0.75rem;
  }

  #upload_progress_container {
    gap: 0.5rem;
  }

  .copy-panel {
    padding: 0.3rem 0.75rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.3rem 0.75rem;
  }

  .copy-panel .panel-heading {
    margin-bottom: 0;
  }

  .copy-panel .panel-subhead {
    margin-bottom: 0;
  }

  .copy-panel .copy-link {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
  }

  .status-panel {
    min-height: auto;
    padding: 0.3rem 0.75rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.3rem 0.75rem;
  }

  .status-panel .panel-heading {
    margin-bottom: 0;
  }

  .status-panel .status-list {
    flex: 1;
    min-width: 200px;
  }

  .status-list {
    gap: 0.3rem;
  }

  .status-list li {
    padding-bottom: 0.2rem;
  }

  .status-list a {
    font-size: 0.85rem;
  }

  .status-bullet {
    font-size: 0.9rem;
  }
}

.panel-heading {
  font-size: clamp(1.1rem, 2vw, 1.8rem);
  letter-spacing: 0.2em;
  margin-bottom: 0.5rem;
}

.panel-subhead {
  font-size: clamp(0.8rem, 1.3vw, 1rem);
  color: var(--muted);
  margin-bottom: 1rem;
}

.hero-panel {
  text-align: left;
}

.hero-link {
  display: inline-block;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  margin-top: 0.25rem;
}

.hero-meta,
.grid-label {
  font-size: clamp(0.8rem, 1.2vw, 1rem);
  color: var(--muted);
}

.hero-meta {
  margin-top: 0.5rem;
}

.drop-panel #drop_zone {
  border: 3px solid var(--outline);
  min-height: clamp(240px, 30vh, 420px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  font-size: clamp(1.2rem, 2.5vw, 2.2rem);
  letter-spacing: 0.15em;
  padding: 2rem;
  transition: background 0.1s linear;
}

#drop_zone_text {
  max-width: 26ch;
}

.drop-panel #drop_zone:hover,
body.drag-over #drop_zone {
  background: rgba(255, 255, 255, 0.08);
}

#file_input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
}

#compression_options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.checkbox-stack {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  font-size: 1rem;
}

.checkbox-stack input[type="checkbox"] {
  width: 24px;
  height: 24px;
  border: 2px solid var(--outline);
  background: transparent;
  appearance: none;
  cursor: pointer;
}

.checkbox-stack input[type="checkbox"]:checked {
  background: var(--accent);
  color: #000;
}

#quality_control {
  display: none;
  border-top: 2px solid var(--outline);
  padding-top: 0.75rem;
}

.quality-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--muted);
}

#quality_presets {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

#quality_presets label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

#quality_presets input[type="radio"] {
  width: 18px;
  height: 18px;
  border: 2px solid var(--outline);
  appearance: none;
  border-radius: 50%;
  background: transparent;
}

#quality_presets input[type="radio"]:checked {
  background: var(--accent);
  color: #000;
}

.progress-panel {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 1rem;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

#upload_progress_container {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s linear;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
}

#upload_progress_container.show {
  opacity: 1;
  visibility: visible;
}

#upload_progress_bar {
  border: 2px solid var(--outline);
  height: 24px;
  overflow: hidden;
  flex: 1;
}

#upload_progress_fill {
  height: 100%;
  width: 0;
  background: repeating-linear-gradient(90deg, var(--fg) 0, var(--fg) 6px, transparent 6px, transparent 12px);
  transition: width 0.3s linear;
}

#upload_progress_fill.uploading {
  animation: strobe 1s linear infinite;
}

#upload_progress_fill.complete {
  background: var(--accent);
  color: #000;
}

#upload_progress_text {
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
}

.copy-panel .copy-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: clamp(1rem, 1.6vw, 1.3rem);
  border: 2px solid var(--outline);
  padding: 0.5rem 1rem;
}

.status-panel {
  min-height: 120px;
}

@media (max-width: 960px) {
  .status-panel {
    min-height: auto;
  }
}

.status-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0;
  margin: 0;
}

.status-list li {
  border-bottom: 2px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.status-list a {
  font-size: clamp(0.9rem, 1.4vw, 1.1rem);
  letter-spacing: 0.1em;
}

.status-bullet {
  flex: 0 0 auto;
  font-size: 1.2rem;
}

.status-link {
  flex: 1 1 auto;
  display: block;
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg);
  border: 3px solid var(--outline);
  padding: 1rem 2rem;
  letter-spacing: 0.2em;
  visibility: hidden;
  z-index: 10;
}

.toast.show {
  visibility: visible;
}

@keyframes strobe {
  0% { filter: invert(0); }
  50% { filter: invert(1); }
  100% { filter: invert(0); }
}

@media (max-width: 640px) {
  body {
    letter-spacing: 0.05em;
    padding: 0.5rem 0.5rem 1rem;
  }

  .panel-heading {
    letter-spacing: 0.1em;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
  }

  .panel-subhead {
    font-size: 0.7rem;
    margin-bottom: 0.5rem;
  }

  .grid-item {
    padding: 0.75rem;
  }

  .hero-panel {
    padding: 0.5rem 0.75rem;
  }

  .hero-title {
    font-size: 1.8rem;
    margin-top: 0;
  }

  .grid-label {
    font-size: 0.7rem;
  }

  .drop-panel #drop_zone {
    min-height: 120px;
    font-size: 1rem;
    padding: 1rem;
  }

  #drop_zone_text {
    max-width: 20ch;
  }

  .checkbox-stack {
    font-size: 0.85rem;
    gap: 0.5rem;
  }

  .checkbox-stack input[type="checkbox"] {
    width: 20px;
    height: 20px;
  }

  #quality_presets label {
    font-size: 0.85rem;
  }

  #quality_presets input[type="radio"] {
    width: 14px;
    height: 14px;
  }

  .progress-panel {
    padding: 0.25rem 0.75rem;
    gap: 0.4rem;
  }

  #upload_progress_bar {
    height: 18px;
  }

  #upload_progress_text {
    font-size: 0.65rem;
  }

  #upload_progress_container {
    gap: 0.4rem;
  }

  .copy-panel {
    padding: 0.5rem 0.75rem;
  }

  .copy-panel .copy-link {
    font-size: 0.85rem;
    padding: 0.4rem 0.75rem;
  }

  .status-panel {
    min-height: 80px;
    padding: 0.5rem 0.75rem;
  }

  .status-list {
    gap: 0.4rem;
  }

  .status-list li {
    padding-bottom: 0.2rem;
    gap: 0.4rem;
  }

  .status-list a {
    font-size: 0.8rem;
  }

  .status-bullet {
    font-size: 0.9rem;
  }

  .toast {
    font-size: 0.8rem;
    padding: 0.6rem 1rem;
    bottom: 1rem;
  }
}