:root {
  --bg: #050914;
  --bg-2: #0A1330;
  --panel: rgba(16, 27, 58, 0.55);
  --panel-solid: #0D1836;
  --border: rgba(107, 150, 255, 0.22);
  --border-strong: rgba(107, 150, 255, 0.45);
  --primary: #3D6BFF;
  --primary-2: #00D9FF;
  --violet: #8B5CFF;
  --text: #EAF1FF;
  --muted: #8C9AC7;
  --danger: #FF5C7A;
  --success: #2FF3B7;
  --warning: #FFC15E;
  --radius-lg: 20px;
  --radius-md: 12px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  position: relative;
  min-height: 100vh;
}

/* ---------- background field ---------- */

.bg-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: radial-gradient(ellipse at top, #0B1642 0%, #050914 55%, #030610 100%);
}

.grid-layer {
  position: absolute;
  inset: -10%;
  background-image:
    linear-gradient(to right, rgba(107, 150, 255, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(107, 150, 255, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 0%, transparent 70%);
  animation: drift 40s linear infinite;
}

@keyframes drift {
  from { transform: translate(0, 0); }
  to { transform: translate(56px, 56px); }
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.35;
}
.orb-a { width: 480px; height: 480px; top: -160px; left: -120px; background: var(--primary); animation: floatA 22s ease-in-out infinite; }
.orb-b { width: 420px; height: 420px; top: 30%; right: -160px; background: var(--violet); animation: floatB 26s ease-in-out infinite; }
.orb-c { width: 360px; height: 360px; bottom: -140px; left: 30%; background: var(--primary-2); opacity: 0.22; animation: floatA 30s ease-in-out infinite reverse; }

@keyframes floatA {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 30px) scale(1.08); }
}
@keyframes floatB {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 40px) scale(1.05); }
}

@media (prefers-reduced-motion: reduce) {
  .grid-layer, .orb { animation: none; }
}

/* ---------- hero ---------- */

.hero { padding: 72px 20px 40px; }

.hero-inner { max-width: 760px; margin: 0 auto; text-align: center; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(61, 107, 255, 0.1);
  color: var(--primary-2);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 22px;
}
.badge-icon { width: 15px; height: 15px; }

h1 {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: clamp(2rem, 4.4vw, 2.9rem);
  line-height: 1.15;
  font-weight: 600;
  margin: 0 0 18px;
  letter-spacing: -0.01em;
}

.gradient-text {
  background: linear-gradient(100deg, var(--primary-2), var(--primary) 55%, var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.65;
  max-width: 560px;
  margin: 0 auto 34px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-num {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--primary-2);
}
.stat-label { font-size: 0.78rem; color: var(--muted); margin-top: 2px; }

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

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 10px 20px 90px;
  position: relative;
}

.flow-line {
  position: absolute;
  left: 43px;
  top: 46px;
  bottom: 90px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), rgba(107, 150, 255, 0.05));
  z-index: 0;
}

.card {
  position: relative;
  z-index: 1;
  background: var(--panel);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 30px 32px;
  margin-bottom: 28px;
  box-shadow: 0 20px 60px rgba(2, 6, 20, 0.45);
}

.card.hidden { display: none; }

.card-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.node {
  flex: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary-2);
  background: #0B1638;
  border: 1px solid var(--border-strong);
  box-shadow: 0 0 0 5px rgba(5, 9, 20, 1), 0 0 18px rgba(0, 217, 255, 0.35);
}

.card-head h2 {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.28rem;
  font-weight: 600;
  margin: 3px 0 6px;
}

.card-sub { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.5; }

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

.dropzone {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 22px 20px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-md);
  background: rgba(61, 107, 255, 0.05);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.dropzone:hover, .dropzone:focus-within { border-color: var(--primary-2); background: rgba(0, 217, 255, 0.07); }
.dropzone input[type="file"] { position: absolute; width: 1px; height: 1px; opacity: 0; }
.drop-icon { width: 26px; height: 26px; color: var(--primary-2); flex: none; }
.drop-text { color: var(--muted); font-size: 0.94rem; }

.upload-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.status-text { margin: 0; color: var(--primary-2); font-size: 0.88rem; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  border: none;
  border-radius: 10px;
  padding: 11px 20px;
  font-family: "Inter", sans-serif;
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn-icon { width: 17px; height: 17px; }

.btn-primary {
  color: #051022;
  background: linear-gradient(100deg, var(--primary-2), var(--primary));
  box-shadow: 0 6px 22px rgba(0, 217, 255, 0.25);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(0, 217, 255, 0.35); }
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-strong);
}
.btn-outline:hover { background: rgba(0, 217, 255, 0.08); border-color: var(--primary-2); }

/* ---------- gauges ---------- */

.gauge-row {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-bottom: 26px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.gauge {
  position: relative;
  width: 108px;
  height: 108px;
  flex: none;
}
.gauge-sm { width: 96px; height: 96px; }

.gauge-svg { width: 100%; height: 100%; transform: rotate(-90deg); }

.gauge-track {
  fill: none;
  stroke: rgba(107, 150, 255, 0.14);
  stroke-width: 9;
}

.gauge-fill {
  fill: none;
  stroke: var(--primary-2);
  stroke-width: 9;
  stroke-linecap: round;
  stroke-dasharray: 314;
  stroke-dashoffset: 314;
  transition: stroke-dashoffset 1.1s cubic-bezier(0.65, 0, 0.35, 1), stroke 0.6s ease;
}
.gauge-fill.danger-fill { stroke: var(--danger); }
.gauge-fill.success-fill { stroke: var(--success); }

.gauge-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.gauge-value { font-family: "Space Grotesk", sans-serif; font-size: 1.5rem; font-weight: 600; }
.gauge-sm .gauge-value { font-size: 1.25rem; }
.gauge-unit { font-size: 0.68rem; color: var(--muted); margin-top: -2px; }

.gauge-caption {
  position: absolute;
  bottom: -22px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.76rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.gauge-label { display: flex; flex-direction: column; gap: 4px; }
.gauge-title { font-weight: 500; font-size: 0.95rem; }
.gauge-desc { color: var(--muted); font-size: 0.83rem; }

.compare-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 26px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.compare-arrow { width: 26px; height: 26px; color: var(--muted); flex: none; }

/* ---------- table ---------- */

.table-wrap { overflow-x: auto; margin-bottom: 22px; border-radius: var(--radius-md); border: 1px solid var(--border); }

table { width: 100%; border-collapse: collapse; min-width: 560px; }

thead th {
  text-align: left;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 500;
  padding: 12px 14px;
  background: rgba(107, 150, 255, 0.06);
  border-bottom: 1px solid var(--border);
}

tbody td {
  padding: 13px 14px;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: rgba(0, 217, 255, 0.04); }

.type-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  background: rgba(139, 92, 255, 0.14);
  color: #C6B4FF;
  border: 1px solid rgba(139, 92, 255, 0.3);
}
.type-pill svg { width: 13px; height: 13px; }

.confidence-bar {
  position: relative;
  width: 74px;
  height: 6px;
  border-radius: 999px;
  background: rgba(107, 150, 255, 0.14);
  overflow: hidden;
}
.confidence-bar span {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
}
.confidence-text { font-size: 0.74rem; color: var(--muted); margin-top: 4px; display: block; }

.sample-values {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.76rem;
  color: var(--muted);
}

select {
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: #0B1638;
  color: var(--text);
  font-size: 0.85rem;
  font-family: "Inter", sans-serif;
}
select:focus { outline: 2px solid var(--primary-2); outline-offset: 1px; }

/* ---------- key notice ---------- */

.key-notice {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 193, 94, 0.08);
  border: 1px solid rgba(255, 193, 94, 0.3);
  color: #FFD98F;
  font-size: 0.85rem;
  margin: 0 0 24px;
}
.key-notice.hidden { display: none; }
.key-icon { width: 17px; height: 17px; flex: none; }
.key-notice code {
  font-family: "JetBrains Mono", monospace;
  background: rgba(0,0,0,0.3);
  padding: 4px 9px;
  border-radius: 6px;
  color: var(--primary-2);
  font-size: 0.82rem;
}

.download-row { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- focus & a11y ---------- */

a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--primary-2);
  outline-offset: 2px;
}

@media (max-width: 620px) {
  .flow-line { display: none; }
  .card { padding: 24px 20px; }
  .compare-row { gap: 16px; }
}