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

:root {
  --accent: #00ff99;
}

body {
  background-color: #0a0a0a;
  color: #ffffff;
  font-family: monospace;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 20px;
}

.container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
  max-width: 1100px;
}

/* header */
.header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

h1 {
  font-size: 32px;
  letter-spacing: 6px;
  color: #ffffff;
}

h1 span {
  color: var(--accent);
}

.subtitle {
  font-size: 12px;
  color: #444;
  letter-spacing: 2px;
}

/* main layout */
.main {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

/* display */
.display-wrapper {
  position: relative;
  flex: 1;
  aspect-ratio: 4/3;
  border: 1px solid #1a1a1a;
  border-radius: 4px;
  overflow: hidden;
  background: #000;
}

/* corner decorations */
.corner {
  position: absolute;
  width: 16px;
  height: 16px;
  z-index: 2;
  pointer-events: none;
}

.corner.tl { top: 8px; left: 8px; border-top: 2px solid var(--accent); border-left: 2px solid var(--accent); }
.corner.tr { top: 8px; right: 8px; border-top: 2px solid var(--accent); border-right: 2px solid var(--accent); }
.corner.bl { bottom: 8px; left: 8px; border-bottom: 2px solid var(--accent); border-left: 2px solid var(--accent); }
.corner.br { bottom: 8px; right: 8px; border-bottom: 2px solid var(--accent); border-right: 2px solid var(--accent); }

video {
  display: none;
}

#ascii-output {
  width: 100%;
  height: 100%;
  font-family: monospace;
  font-size: 6px;
  line-height: 1.05;
  color: var(--accent);
  overflow: hidden;
  padding: 4px;
  white-space: pre;
}

.placeholder {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  font-size: 14px;
  color: #222;
  letter-spacing: 4px;
}

/* Flash overlay for capture effect */
.flash-overlay {
  position: absolute;
  inset: 0;
  background: white;
  opacity: 0;
  pointer-events: none;
  z-index: 10;
  transition: opacity 0.05s ease-in;
}

.flash-overlay.flash-active {
  opacity: 0.85;
  transition: none;
}

/* sidebar */
.sidebar {
  width: 220px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-shrink: 0;
}

/* cards */
.card {
  background: #111;
  border: 1px solid #1e1e1e;
  border-radius: 6px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-title {
  font-size: 10px;
  letter-spacing: 3px;
  color: #444;
}

/* buttons */
button {
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: monospace;
  font-size: 13px;
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 2px;
  transition: all 0.15s;
  width: 100%;
}

button:hover:not(:disabled) {
  background: var(--accent);
  color: #0a0a0a;
}

button:disabled {
  opacity: 0.25;
  cursor: not-allowed;
  border-color: #555;
  color: #555;
}

/* capture button special style */
.capture-btn {
  border-color: var(--accent);
  font-size: 14px;
  letter-spacing: 3px;
  position: relative;
  overflow: hidden;
}

.capture-btn:not(:disabled):hover {
  background: var(--accent);
  color: #0a0a0a;
}

/* flip button — only show on touch devices */
.flip-btn {
  display: none;
}

@media (hover: none) and (pointer: coarse) {
  .flip-btn {
    display: block;
  }
}

/* theme buttons */
.theme-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.theme-btn {
  flex: 1;
  padding: 6px 4px;
  font-size: 11px;
  letter-spacing: 1px;
}

.theme-btn.active {
  background: var(--accent);
  color: #0a0a0a;
}

/* charset buttons */
.charset-buttons {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.charset-btn {
  font-size: 11px;
  letter-spacing: 1px;
}

.charset-btn.active {
  background: var(--accent);
  color: #0a0a0a;
}

/* sliders */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #888;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ─── TABLET ─────────────────────────────── */
@media (max-width: 768px) {
  body {
    padding: 16px;
  }

  h1 {
    font-size: 24px;
    letter-spacing: 4px;
  }

  .main {
    flex-direction: column;
    gap: 16px;
  }

  .display-wrapper {
    width: 100%;
    aspect-ratio: 4/3;
  }

  .sidebar {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .card:first-child {
    grid-column: 1 / -1;
  }
}

/* ─── MOBILE ─────────────────────────────── */
@media (max-width: 480px) {
  body {
    padding: 10px;
  }

  h1 {
    font-size: 18px;
    letter-spacing: 2px;
  }

  .subtitle {
    font-size: 9px;
  }

  .main {
    flex-direction: column;
    gap: 10px;
  }

  .display-wrapper {
    width: 100%;
    aspect-ratio: 9/10;
  }

  #ascii-output {
    font-size: 3px;
    line-height: 1.0;
    padding: 2px;
  }

  .sidebar {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .card {
    padding: 10px;
  }

  .card-title {
    font-size: 9px;
    letter-spacing: 2px;
  }

  .theme-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 5px;
  }

  .charset-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5px;
  }

  button {
    font-size: 11px;
    padding: 10px 6px;
    letter-spacing: 1px;
  }

  .theme-btn,
  .charset-btn {
    font-size: 10px;
    padding: 9px 4px;
    letter-spacing: 0px;
  }

  input[type="range"] {
    height: 22px;
  }

  .slider-label {
    font-size: 13px;
    color: #aaa;
  }

  .corner {
    width: 12px;
    height: 12px;
  }
}
/* ─── MOBILE OVERLAY PANEL ───────────────── */
@media (max-width: 768px) {
  .main {
    position: relative;
  }

  .display-wrapper {
    position: sticky;
    top: 10px;
    z-index: 1;
  }

  .sidebar {
    position: relative;
    z-index: 2;
    margin-top: -60px; /* pulls sidebar up to overlap canvas bottom */
    background: linear-gradient(to bottom, transparent 0%, #0a0a0a 60px);
    padding-top: 60px;
  }

  .card:first-child {
    background: rgba(17,17,17,0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }

  .card {
    background: rgba(17,17,17,0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }
}