:root {
  --bg: #070910;
  --bg-panel: #0d111c;
  --bg-panel-2: #10152280;
  --border: #1e2740;
  --cyan: #2de2e6;
  --magenta: #ff2ec4;
  --yellow: #f4d35e;
  --text: #e8f0fa;
  --muted: #9aabce;
  --danger: #ff4d6d;
  --font: ui-monospace, "Cascadia Code", "Consolas", "SFMono-Regular", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  letter-spacing: 0.02em;
  position: relative;
  overflow-x: hidden;
}

/* ---------- backdrop fx ---------- */

.grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(transparent 0, transparent 95%, rgba(45, 226, 230, 0.06) 100%),
    repeating-linear-gradient(0deg, rgba(45, 226, 230, 0.05) 0, rgba(45, 226, 230, 0.05) 1px, transparent 1px, transparent 48px),
    repeating-linear-gradient(90deg, rgba(255, 46, 196, 0.04) 0, rgba(255, 46, 196, 0.04) 1px, transparent 1px, transparent 48px);
  background-color: var(--bg);
}

.grid-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(45, 226, 230, 0.08), transparent 55%),
              radial-gradient(ellipse at 50% 100%, rgba(255, 46, 196, 0.06), transparent 55%);
}

.scanlines {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.15),
    rgba(0, 0, 0, 0.15) 1px,
    transparent 1px,
    transparent 3px
  );
  opacity: 0.35;
  mix-blend-mode: overlay;
}

/* ---------- layout ---------- */

header, main, footer {
  position: relative;
  z-index: 2;
}

.site-header {
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
}

.header-links {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.back-link {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.35rem 0.7rem;
  transition: border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.back-link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 10px rgba(45, 226, 230, 0.25);
}

.logo {
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  font-weight: 700;
  color: #fff;
  text-shadow: 0 0 6px var(--cyan), 0 0 18px rgba(45, 226, 230, 0.5);
  letter-spacing: 0.08em;
}

.logo .slash {
  color: var(--magenta);
  text-shadow: 0 0 6px var(--magenta), 0 0 18px rgba(255, 46, 196, 0.6);
}

.tagline {
  margin-top: 0.6rem;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.15em;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.panel {
  background: linear-gradient(180deg, var(--bg-panel), #0a0d16);
  border: 1px solid var(--border);
  border-left: 2px solid var(--cyan);
  border-radius: 4px;
  padding: 1.5rem;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.4), 0 8px 30px rgba(0,0,0,0.35);
}

.panel h2 {
  margin: 0 0 1.1rem;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--text);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.step {
  color: var(--bg);
  background: var(--cyan);
  font-size: 0.7rem;
  padding: 0.15rem 0.4rem;
  border-radius: 2px;
  font-weight: 700;
}

/* ---------- guide page ---------- */

.guide-text {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text);
  margin: 0 0 0.9rem;
}

.guide-text:last-child {
  margin-bottom: 0;
}

.guide-text strong {
  color: var(--cyan);
}

.guide-list {
  list-style: none;
  margin: 0 0 0.9rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.guide-list li {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 0.4rem;
  font-size: 0.82rem;
}

.guide-key {
  color: var(--text);
}

.guide-val {
  color: var(--cyan);
}

.guide-tips {
  margin: 0;
  padding-left: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.guide-tips li {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text);
}

.guide-cta {
  align-self: center;
  text-decoration: none;
  margin-top: 0.5rem;
}

/* ---------- target panel ---------- */

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.6rem;
  margin-bottom: 1.1rem;
}

.preset-btn {
  background: #0c1120;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--font);
  padding: 0.7rem 0.6rem;
  border-radius: 3px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  align-items: flex-start;
  transition: border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.preset-btn span {
  font-size: 0.68rem;
  color: var(--muted);
}

.preset-btn:hover {
  border-color: var(--cyan);
  color: var(--text);
}

.preset-btn.active {
  border-color: var(--cyan);
  color: #fff;
  box-shadow: 0 0 0 1px var(--cyan), 0 0 14px rgba(45, 226, 230, 0.35);
}

.preset-btn.active span {
  color: var(--cyan);
}

.custom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.4rem 0;
}

.custom-row label {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.custom-row input[type="number"] {
  background: #0c1120;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font);
  padding: 0.45rem 0.6rem;
  border-radius: 3px;
  width: 6rem;
  text-align: right;
}

.custom-row input[type="number"]:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 8px rgba(45, 226, 230, 0.3);
}

.custom-row select {
  background: #0c1120;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font);
  padding: 0.45rem 0.6rem;
  border-radius: 3px;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  max-width: 60%;
}

.custom-row select:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 8px rgba(45, 226, 230, 0.3);
}

.advanced {
  margin-top: 0.8rem;
  border-top: 1px dashed var(--border);
  padding-top: 0.6rem;
}

.advanced summary {
  cursor: pointer;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.1em;
}

.advanced summary:hover {
  color: var(--cyan);
}

.advanced-note {
  font-size: 0.68rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
  line-height: 1.5;
}

/* ---------- dropzone ---------- */

.dropzone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: 4px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone:hover, .dropzone:focus-visible {
  border-color: var(--cyan);
  outline: none;
}

.dropzone.dragover {
  border-color: var(--magenta);
  background: rgba(255, 46, 196, 0.05);
  box-shadow: 0 0 24px rgba(255, 46, 196, 0.2) inset;
}

.dropzone input[type="file"] {
  display: none;
}

.drop-icon {
  color: var(--cyan);
  font-size: 1.4rem;
  text-shadow: 0 0 10px rgba(45, 226, 230, 0.6);
  margin-bottom: 0.6rem;
}

.drop-text {
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: #fff;
  text-shadow: 0 0 8px rgba(45, 226, 230, 0.4);
}

.drop-sub {
  margin-top: 0.6rem;
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ---------- queue ---------- */

.queue-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.2rem;
}

.queue-item {
  border: 1px solid var(--border);
  border-left: 2px solid var(--muted);
  border-radius: 3px;
  padding: 0.7rem 0.9rem;
  background: #0a0e18;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.3rem 0.8rem;
  align-items: center;
}

.queue-item.status-done {
  border-left-color: var(--cyan);
}

.queue-item.status-error {
  border-left-color: var(--danger);
}

.qi-name {
  grid-column: 1 / 2;
  font-size: 0.82rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.qi-status {
  grid-column: 2 / 3;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-align: right;
}

.qi-status.status-done { color: var(--cyan); }
.qi-status.status-error { color: var(--danger); }
.qi-status.status-measuring,
.qi-status.status-normalizing,
.qi-status.status-encoding { color: var(--yellow); }

.qi-meter {
  grid-column: 1 / 3;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.72rem;
  color: var(--muted);
}

.qi-target {
  color: var(--cyan);
}

.qi-gain {
  color: var(--magenta);
}

.qi-progress {
  grid-column: 1 / 3;
  height: 3px;
  background: #131a2b;
  border-radius: 2px;
  overflow: hidden;
}

.qi-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  box-shadow: 0 0 8px rgba(45, 226, 230, 0.6);
  transition: width 0.25s ease;
}

.qi-actions {
  grid-column: 1 / 3;
  display: flex;
  justify-content: flex-end;
}

.qi-download {
  font-size: 0.68rem;
  color: var(--bg);
  background: var(--cyan);
  padding: 0.3rem 0.7rem;
  border-radius: 3px;
  text-decoration: none;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.qi-download:hover {
  box-shadow: 0 0 12px rgba(45, 226, 230, 0.5);
}

.qi-error {
  font-size: 0.68rem;
  color: var(--danger);
}

.batch-controls {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.overall-progress {
  height: 5px;
  background: #131a2b;
  border-radius: 3px;
  overflow: hidden;
}

.overall-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  box-shadow: 0 0 10px rgba(45, 226, 230, 0.6);
  transition: width 0.3s ease;
}

.batch-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.btn {
  font-family: var(--font);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  padding: 0.65rem 1.2rem;
  border-radius: 3px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: #0c1120;
  color: var(--text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, color 0.15s ease;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  border-color: var(--cyan);
  color: #fff;
  box-shadow: 0 0 12px rgba(45, 226, 230, 0.25);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 0 18px rgba(45, 226, 230, 0.5);
}

.btn-secondary {
  border-color: var(--magenta);
  color: #fff;
}

.btn-secondary:hover:not(:disabled) {
  box-shadow: 0 0 18px rgba(255, 46, 196, 0.4);
}

.btn-ghost {
  color: var(--muted);
}

.btn-ghost:hover {
  color: var(--danger);
  border-color: var(--danger);
}

/* ---------- footer ---------- */

.site-footer {
  text-align: center;
  padding: 1.5rem 1rem 2.5rem;
  font-size: 0.65rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.site-footer .dot {
  margin: 0 0.5rem;
  color: var(--border);
}

.footer-link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px dotted var(--border);
}

.footer-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

@media (max-width: 480px) {
  .qi-name { white-space: normal; }
  .site-header { padding: 2rem 1rem 1.2rem; }
}