:root {
  --ink: #e8f0ea;
  --ink-muted: #8fa396;
  --ink-faint: #5c7264;
  --bg: #0a0f0c;
  --bg-elev: #121a15;
  --bg-soft: #18211c;
  --line: rgba(232, 240, 234, 0.1);
  --line-strong: rgba(232, 240, 234, 0.18);
  --volt: #b8f23a;
  --volt-dim: #8fbf1f;
  --volt-soft: rgba(184, 242, 58, 0.14);
  --sky: #5ec8ff;
  --sky-soft: rgba(94, 200, 255, 0.12);
  --warn: #ffb454;
  --danger: #ff6b6b;
  --radius: 20px;
  --radius-sm: 14px;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  --font-display: "Syne", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: 0;
  background: none;
}

input,
select {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 0.85rem 1rem;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

input:focus,
select:focus {
  border-color: var(--volt);
  box-shadow: 0 0 0 3px var(--volt-soft);
}

input::placeholder {
  color: var(--ink-faint);
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 55% at 10% -10%, rgba(184, 242, 58, 0.12), transparent 55%),
    radial-gradient(ellipse 70% 50% at 100% 10%, rgba(94, 200, 255, 0.1), transparent 50%),
    radial-gradient(ellipse 60% 40% at 50% 110%, rgba(184, 242, 58, 0.08), transparent 55%),
    linear-gradient(180deg, #0a0f0c 0%, #0d1410 100%);
}

.lane {
  position: absolute;
  left: -10%;
  right: -10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(184, 242, 58, 0.22), transparent);
  opacity: 0.55;
  animation: lane-drift 14s linear infinite;
}

.lane-a {
  top: 28%;
  transform: rotate(-8deg);
}

.lane-b {
  top: 72%;
  transform: rotate(6deg);
  animation-duration: 18s;
  animation-direction: reverse;
  opacity: 0.35;
}

.glow {
  position: absolute;
  width: 42vmax;
  height: 42vmax;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.35;
  animation: glow-pulse 9s ease-in-out infinite;
}

.glow-a {
  top: -12%;
  right: -8%;
  background: rgba(184, 242, 58, 0.25);
}

.glow-b {
  bottom: -18%;
  left: -12%;
  background: rgba(94, 200, 255, 0.2);
  animation-delay: -4s;
}

@keyframes lane-drift {
  from {
    transform: translateX(-4%) rotate(-8deg);
  }
  to {
    transform: translateX(4%) rotate(-8deg);
  }
}

@keyframes glow-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.28;
  }
  50% {
    transform: scale(1.12);
    opacity: 0.42;
  }
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: calc(0.9rem + var(--safe-t)) 1.25rem 0.9rem;
  backdrop-filter: blur(14px);
  background: rgba(10, 15, 12, 0.72);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0;
}

.brand-mark {
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 0.35rem;
  background: linear-gradient(135deg, var(--volt), #7ad0ff);
  box-shadow: 0 0 18px rgba(184, 242, 58, 0.45);
  animation: mark-spin 8s linear infinite;
}

@keyframes mark-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.brand-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.45rem;
  letter-spacing: -0.03em;
}

.brand-sub {
  margin: 0;
  font-size: 0.78rem;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

#app {
  width: min(720px, 100%);
  margin: 0 auto;
  padding: 1.25rem 1.15rem calc(2.5rem + var(--safe-b));
}

.screen {
  animation: screen-in 0.42s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes screen-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero {
  margin: 0.4rem 0 1.5rem;
}

.hero h1 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 6.5vw, 2.55rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.hero p {
  margin: 0;
  max-width: 34ch;
  color: var(--ink-muted);
  font-size: 1.02rem;
}

.menu {
  display: grid;
  gap: 0.85rem;
}

.menu-option {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  text-align: left;
  padding: 1.15rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  background: linear-gradient(160deg, rgba(24, 33, 28, 0.95), rgba(18, 26, 21, 0.88));
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.menu-option:hover,
.menu-option:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(184, 242, 58, 0.45);
  outline: none;
}

.menu-option:active {
  transform: translateY(0) scale(0.99);
}

.menu-num {
  width: 2.4rem;
  height: 2.4rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--volt-soft);
  color: var(--volt);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
}

.menu-copy strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.menu-copy span {
  display: block;
  color: var(--ink-muted);
  font-size: 0.92rem;
}

.menu-arrow {
  color: var(--volt);
  font-size: 1.35rem;
  transition: transform 0.2s ease;
}

.menu-option:hover .menu-arrow {
  transform: translateX(3px);
}

.panel {
  display: grid;
  gap: 1rem;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin: 0.2rem 0 0;
}

.section-title h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  color: var(--ink-muted);
  font-size: 0.88rem;
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.chip:hover {
  transform: translateY(-1px);
}

.chip.is-active {
  background: var(--volt-soft);
  border-color: rgba(184, 242, 58, 0.55);
  color: var(--volt);
}

.field-grid {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 560px) {
  .field-grid.cols-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.field .hint {
  font-size: 0.78rem;
  color: var(--ink-faint);
}

.result {
  margin-top: 0.35rem;
  padding: 1.15rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(184, 242, 58, 0.28);
  background:
    linear-gradient(145deg, rgba(184, 242, 58, 0.1), transparent 55%),
    var(--bg-elev);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.result.is-empty {
  border-color: var(--line);
  background: var(--bg-elev);
  color: var(--ink-muted);
  animation: none;
}

.result-label {
  margin: 0 0 0.35rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.result-value {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}

.result-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1rem;
}

.stat {
  padding: 0.7rem 0.65rem;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--line);
}

.stat span {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  margin-bottom: 0.2rem;
}

.stat strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.blocks {
  display: grid;
  gap: 0.85rem;
}

.block {
  position: relative;
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  display: grid;
  gap: 0.85rem;
  animation: block-in 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes block-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.block-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.block-title {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
}

.block-idx {
  width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--sky-soft);
  color: var(--sky);
  font-size: 0.85rem;
  font-family: var(--font-display);
}

.block-actions {
  display: inline-flex;
  gap: 0.25rem;
}

.icon-btn {
  width: 2.1rem;
  height: 2.1rem;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: var(--ink-muted);
  border: 1px solid transparent;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.icon-btn:hover,
.icon-btn:focus-visible {
  background: var(--bg-soft);
  color: var(--ink);
  border-color: var(--line);
  outline: none;
}

.icon-btn.danger:hover {
  color: var(--danger);
  border-color: rgba(255, 107, 107, 0.35);
}

.icon-btn:disabled {
  opacity: 0.35;
  pointer-events: none;
}

.block-summary {
  font-size: 0.88rem;
  color: var(--ink-muted);
  font-variant-numeric: tabular-nums;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.85rem;
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--volt);
  color: #10160f;
}

.btn-primary:hover {
  background: #c8ff4d;
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--bg-elev);
}

.btn-soft {
  background: var(--volt-soft);
  color: var(--volt);
  border: 1px solid rgba(184, 242, 58, 0.3);
}

.error {
  margin: 0;
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.35);
  color: #ffb4b4;
  font-size: 0.9rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
  color: var(--ink-muted);
  font-weight: 600;
  font-size: 0.9rem;
}

.back-link:hover {
  color: var(--volt);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}