:root {
  --bg: #0c111d;
  --bg-soft: #152338;
  --glass: rgba(15, 24, 39, 0.62);
  --glass-border: rgba(203, 221, 244, 0.22);
  --ink: #eaf1ff;
  --muted: #97aecf;
  --accent: #3ce0c3;
  --accent-strong: #1ec6aa;
  --warn: #ffc078;
  --danger: #ff7b7b;
  --json-key: #7ecbff;
  --json-string: #97f0bf;
  --json-number: #ffd88f;
  --md-heading: #ffd88f;
  --md-code: #97f0bf;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 15%, #183d4b 0%, transparent 45%),
    radial-gradient(circle at 78% 22%, #3b2c1e 0%, transparent 35%),
    linear-gradient(160deg, #090e18 0%, #111f31 50%, #0e1522 100%);
  overflow-x: hidden;
}

h1,
.tab,
.btn,
.drop-title {
  font-family: "Space Grotesk", "Noto Sans JP", sans-serif;
}

.bg-orb {
  position: fixed;
  z-index: 0;
  filter: blur(70px);
  opacity: 0.25;
  border-radius: 999px;
}

.bg-orb-a {
  width: 330px;
  height: 330px;
  background: #00f3bf;
  top: -90px;
  left: -80px;
}

.bg-orb-b {
  width: 420px;
  height: 420px;
  background: #f7a54a;
  bottom: -170px;
  right: -120px;
}

.shell {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 34px 18px 44px;
  display: grid;
  gap: 18px;
}

.card {
  background: linear-gradient(150deg, rgba(16, 26, 42, 0.7), rgba(11, 19, 31, 0.65));
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 30px rgba(5, 9, 18, 0.44);
}

.hero {
  padding: 24px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
}

h1 {
  margin: 0;
  font-size: clamp(1.65rem, 4vw, 2.25rem);
}

.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
}

.uploader {
  padding: 20px;
}

.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 220px;
  border: 2px dashed rgba(158, 203, 255, 0.42);
  border-radius: 16px;
  padding: 24px;
  background: linear-gradient(180deg, rgba(26, 39, 60, 0.45), rgba(11, 20, 34, 0.2));
  cursor: pointer;
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.drop-zone.dragover {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(60, 224, 195, 0.18);
  transform: scale(1.01);
}

.drop-zone input {
  display: none;
}

.drop-title {
  font-size: 1.3rem;
  font-weight: 700;
}

.drop-meta,
.file-name {
  margin-top: 10px;
  color: var(--muted);
}

.file-name {
  max-width: 100%;
  overflow-wrap: anywhere;
}

.toolbar {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.btn {
  border: 1px solid rgba(160, 189, 224, 0.5);
  border-radius: 11px;
  background: rgba(20, 32, 51, 0.66);
  color: var(--ink);
  font-size: 0.92rem;
  padding: 11px 10px;
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(130deg, var(--accent), var(--accent-strong));
  color: #08211f;
  font-weight: 700;
  border: none;
}

.progress-panel {
  margin-top: 14px;
}

.progress-track {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: rgba(17, 31, 49, 0.95);
  overflow: hidden;
}

.progress-bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #8de9ff, #ffce8a);
  transition: width 180ms linear;
}

.progress-panel p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.hidden {
  display: none;
}

.results {
  padding: 16px;
}

.tabs {
  display: flex;
  gap: 8px;
}

.tab {
  border: none;
  border-radius: 9px;
  background: rgba(21, 33, 53, 0.75);
  color: var(--ink);
  padding: 8px 13px;
  cursor: pointer;
}

.tab.active {
  background: rgba(61, 104, 153, 0.68);
}

.result-meta {
  margin: 11px 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.result-pane {
  display: none;
  min-height: 320px;
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  padding: 14px;
  border-radius: 13px;
  border: 1px solid rgba(138, 166, 199, 0.3);
  background: rgba(6, 11, 19, 0.72);
  color: var(--ink);
  max-height: 60vh;
  overflow-y: auto;
}

.result-pane.active {
  display: block;
}

.json-key {
  color: var(--json-key);
}

.json-string {
  color: var(--json-string);
}

.json-number,
.json-boolean,
.json-null {
  color: var(--json-number);
}

.md-heading {
  color: var(--md-heading);
  font-weight: 700;
}

.md-code {
  color: var(--md-code);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(10px);
  border-radius: 999px;
  background: rgba(9, 17, 28, 0.9);
  border: 1px solid rgba(150, 181, 218, 0.36);
  color: var(--ink);
  padding: 8px 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 920px) {
  .toolbar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .shell {
    padding: 18px 12px 26px;
  }

  .drop-zone {
    min-height: 190px;
  }

  .toolbar {
    grid-template-columns: 1fr;
  }
}