:root {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  color: #0f172a;
  --page-bg: #f8fafc;
  --page-bg-accent: #e0f2fe;
  --panel-bg: #ffffff;
  --text-primary: #0f172a;
  --text-muted: #475569;
  --text-subtle: #334155;
  --kicker: #64748b;
  --accent: #2563eb;
  --accent-strong: #4338ca;
  --accent-soft: #1d4ed8;
  --border: #e2e8f0;
  --border-strong: #cbd5f5;
  --metric-bg: linear-gradient(135deg, #ecfeff, #eef2ff);
  --metric-border: rgba(59, 130, 246, 0.15);
  --table-header: #f1f5f9;
  --root-banner-bg: linear-gradient(135deg, #1e3a8a, #312e81);
  --root-banner-overlay: rgba(15, 23, 42, 0.45);
  --root-banner-text: #e0f2fe;
  --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --shadow-1: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-2: 0 6px 20px rgba(15, 23, 42, 0.06);
  --shadow-3: 0 20px 35px rgba(30, 58, 138, 0.35);
  --overlay: rgba(15, 23, 42, 0.55);
  --panel-divider: #f1f5f9;
  background: radial-gradient(circle at top, var(--page-bg-accent), var(--page-bg) 45%);
}

[data-theme='dark'] {
  color: #e5e7eb;
  --page-bg: #0b1220;
  --page-bg-accent: #111c2f;
  --panel-bg: #111827;
  --text-primary: #e5e7eb;
  --text-muted: #cbd5f5;
  --text-subtle: #c7d2fe;
  --kicker: #94a3b8;
  --accent: #60a5fa;
  --accent-strong: #7c3aed;
  --accent-soft: #60a5fa;
  --border: #1f2a3a;
  --border-strong: #243b53;
  --metric-bg: linear-gradient(135deg, #0f172a, #111827);
  --metric-border: rgba(96, 165, 250, 0.3);
  --table-header: #1f2937;
  --root-banner-bg: linear-gradient(135deg, #1e293b, #111827);
  --root-banner-overlay: rgba(15, 23, 42, 0.65);
  --root-banner-text: #c7d2fe;
  --shadow-1: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-2: 0 6px 20px rgba(0, 0, 0, 0.25);
  --shadow-3: 0 20px 40px rgba(0, 0, 0, 0.4);
  --overlay: rgba(0, 0, 0, 0.65);
  --panel-divider: #1f2a3a;
  background: radial-gradient(circle at top, var(--page-bg-accent), var(--page-bg) 45%);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: clamp(1rem, 4vw, 2.5rem);
  min-height: 100vh;
  color: var(--text-primary);
  background: radial-gradient(circle at top, var(--page-bg-accent), var(--page-bg) 45%);
}

.topbar {
  max-width: 1040px;
  margin: 0 auto 1rem;
  padding: 0 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
}

.brand {
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.topbar-actions {
  display: flex;
  gap: 0.5rem;
}

.theme-toggle {
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--text-primary);
  padding: 0.35rem 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.theme-toggle:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.15);
}

.theme-toggle .toggle-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.theme-toggle .toggle-track {
  width: 52px;
  height: 26px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--panel-bg);
  position: relative;
  transition: background 0.2s ease, border-color 0.2s ease;
  display: inline-flex;
  align-items: center;
}

.theme-toggle .toggle-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  position: absolute;
  top: 50%;
  left: 4px;
  transform: translate(0, -50%);
  transition: transform 0.2s ease, background 0.2s ease;
}

.theme-toggle.is-light .toggle-track {
  background: rgba(96, 165, 250, 0.2);
  border-color: var(--accent);
}

.theme-toggle.is-light .toggle-thumb {
  transform: translate(22px, -50%);
}

.theme-toggle.is-light .toggle-label:last-child {
  color: var(--accent);
}

.theme-toggle:not(.is-light) .toggle-label:first-child {
  color: var(--accent);
}

.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  backdrop-filter: blur(4px);
}

.loading-overlay[hidden] {
  display: none !important;
}

.loading-content {
  background: var(--panel-bg);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  min-width: 240px;
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
  text-align: center;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 4px solid rgba(59, 130, 246, 0.25);
  border-top-color: var(--accent);
  animation: spin 1s linear infinite;
}

.loading-content p {
  margin: 0;
  font-weight: 600;
  color: var(--text-primary);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.page {
  max-width: 1040px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: clamp(1rem, 3vw, 1.6rem);
}

.hero {
  background: var(--panel-bg);
  border-radius: 16px;
  padding: clamp(1.25rem, 4vw, 2.25rem);
  box-shadow: var(--shadow-1);
  display: grid;
  gap: 1.25rem;
}

.hero-heading {
  display: grid;
  gap: 0.35rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.75rem);
  letter-spacing: -0.02em;
}

.hero-heading p {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text-subtle);
}

.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 700;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.hero-metrics > div {
  padding: 0.9rem 1rem;
  border-radius: 12px;
  background: var(--metric-bg);
  border: 1px solid var(--metric-border);
}

.metric-label {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.metric-copy {
  margin: 0.45rem 0 0;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.panel {
  background: var(--panel-bg);
  border-radius: 14px;
  padding: clamp(1rem, 3vw, 1.75rem);
  box-shadow: var(--shadow-2);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: baseline;
  justify-content: space-between;
}

.panel-heading h2 {
  margin: 0;
}

.panel-kicker {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--kicker);
  margin: 0 0 0.15rem;
  font-weight: 700;
}

.panel-subhead {
  margin: 0;
  color: var(--text-muted);
  max-width: 420px;
}

.form {
  display: grid;
  gap: 1rem;
  margin-bottom: 1rem;
}

.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  cursor: pointer;
  background: var(--page-bg);
  transition: border-color 0.2s ease, background 0.2s ease;
  display: grid;
  gap: 0.35rem;
}

.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(37, 99, 235, 0.12);
}

.dropzone p {
  margin: 0;
  font-weight: 600;
  color: var(--text-primary);
}

.selected-file {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--text-primary);
}

.field input {
  padding: 0.65rem 0.8rem;
  font-size: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: var(--panel-bg);
  color: var(--text-primary);
}

.input-with-toggle {
  display: flex;
  align-items: center;
  background: var(--panel-bg);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 0.1rem 0.15rem 0.1rem 0.4rem;
}

.input-with-toggle input {
  border: none;
  padding: 0.5rem 0.4rem;
  flex: 1;
  border-radius: 12px;
}

.input-with-toggle input:focus {
  outline: none;
}

.field input[type='file'] {
  cursor: pointer;
}

.field input[type='file']::file-selector-button,
.field input[type='file']::-webkit-file-upload-button {
  margin-right: 0.75rem;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  font-weight: 600;
  padding: 0.45rem 1.25rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.field input[type='file']::file-selector-button:hover,
.field input[type='file']::-webkit-file-upload-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(67, 56, 202, 0.35);
}

.field input[type='file']:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button {
  background: var(--accent);
  color: var(--panel-bg);
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.5rem;
  font-size: 1rem;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover:not([disabled]) {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
}

button[disabled] {
  background: rgba(147, 197, 253, 0.5);
  cursor: progress;
  box-shadow: none;
}

.ghost {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--accent-soft);
  box-shadow: none;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: none;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-strong);
  padding: 0;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.icon-button .icon-lock {
  width: 18px;
  height: 20px;
  position: relative;
}

.icon-lock::before,
.icon-lock::after {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
}

.icon-lock::before {
  width: 14px;
  height: 12px;
  bottom: 0;
  border-radius: 4px;
  background: currentColor;
}

.icon-lock::after {
  width: 10px;
  height: 10px;
  top: -6px;
  border: 2px solid currentColor;
  border-bottom: none;
  border-radius: 999px 999px 0 0;
  background: transparent;
}

.icon-button[aria-pressed='true'],
.icon-button.is-active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  box-shadow: 0 8px 20px rgba(67, 56, 202, 0.35);
}

.icon-button[aria-pressed='true'] .icon-lock::after,
.icon-button.is-active .icon-lock::after {
  transform: rotate(-10deg) translateX(2px);
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.hint {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.status {
  min-height: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.status.error {
  color: #b91c1c;
}

.status.ok {
  color: #16a34a;
}

.root-banner {
  display: grid;
  gap: 0.35rem;
  border-radius: 18px;
  padding: 1.25rem;
  background: var(--root-banner-bg);
  color: var(--root-banner-text);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: var(--shadow-3);
  max-width: 840px;
  width: 100%;
  margin: -0.25rem auto 0.5rem;
}

.root-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(226, 232, 240, 0.85);
  font-weight: 700;
}

.root-value {
  font-family: var(--mono);
  font-size: clamp(1rem, 3vw, 1.4rem);
  word-break: break-all;
  padding: 0.65rem 0.75rem;
  background: var(--root-banner-overlay);
  border-radius: 12px;
}

.root-prefix {
  color: #fbbf24;
}

.meta {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.35rem 1rem;
  margin: 0 0 1rem;
}

.meta dt {
  font-weight: 700;
  color: var(--text-primary);
}

.meta dd {
  margin: 0;
  color: var(--text-muted);
}

.data-status {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.status-card {
  border-radius: 16px;
  padding: 1rem 1.25rem;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(99, 102, 241, 0.18));
  border: 1px solid rgba(59, 130, 246, 0.35);
  display: grid;
  gap: 0.45rem;
  color: var(--text-primary);
}

.status-card:nth-child(2) {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(45, 212, 191, 0.2));
  border-color: rgba(16, 185, 129, 0.35);
}

[data-theme='dark'] .status-card {
  background: linear-gradient(135deg, rgba(96, 165, 250, 0.2), rgba(129, 140, 248, 0.25));
  border-color: rgba(96, 165, 250, 0.4);
}

[data-theme='dark'] .status-card:nth-child(2) {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.2), rgba(16, 185, 129, 0.25));
  border-color: rgba(34, 197, 94, 0.4);
}

.card-kicker {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: rgba(15, 23, 42, 0.65);
  margin: 0;
}

[data-theme='dark'] .card-kicker {
  color: rgba(226, 232, 240, 0.8);
}

.card-value {
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  font-weight: 700;
  margin: 0;
  color: #0f172a;
}

[data-theme='dark'] .card-value {
  color: #f8fafc;
}

.card-footnote {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(15, 23, 42, 0.75);
}

[data-theme='dark'] .card-footnote {
  color: rgba(226, 232, 240, 0.85);
}

.entries {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 0.5rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--table-header);
}

.footnote {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.recent-section {
  margin-top: 1.5rem;
  border-radius: 16px;
  padding: 1rem 1.25rem;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.95), rgba(219, 234, 254, 0.85));
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

[data-theme='dark'] .recent-section {
  background: linear-gradient(120deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.85));
  border-color: rgba(59, 130, 246, 0.25);
}

.recent-heading {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.recent-heading h3 {
  margin: 0;
}

.recent-heading p {
  margin: 0;
  color: var(--text-muted);
}

.recent-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.65rem;
}

.recent-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0.75rem;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

[data-theme='dark'] .recent-item {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.08);
}

.recent-title {
  font-weight: 600;
  color: var(--text-primary);
}

.recent-date {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tree-section {
  margin-top: 1.5rem;
  border-top: 1px solid var(--panel-divider);
  padding-top: 1.25rem;
}

.tree-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.tree-header h3 {
  margin: 0;
}

.tree-header p {
  margin: 0.2rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.merkle-tree {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

.merkle-tree.collapsed {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
}

.merkle-tree.expanded {
  max-height: 2000px;
  opacity: 1;
  pointer-events: auto;
}

.merkle-level {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  background: var(--page-bg);
}

.merkle-level h4 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
}

.merkle-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.merkle-node {
  font-family: var(--mono);
  font-size: 0.9rem;
  word-break: break-all;
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
}

.merkle-node .node-title {
  font-weight: 600;
  color: var(--text-primary);
}

.merkle-node.duplicate {
  opacity: 0.7;
}

@media (max-width: 900px) {
  body {
    padding: clamp(0.75rem, 4vw, 2rem);
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .panel-heading {
    flex-direction: column;
    align-items: flex-start;
  }

  .root-banner {
    margin: 0 auto;
  }
}

@media (max-width: 640px) {
  .hero,
  .panel {
    padding: clamp(1rem, 6vw, 1.5rem);
  }

  .hero h1 {
    font-size: clamp(1.65rem, 8vw, 2.1rem);
  }

  .hero-heading p,
  .panel-subhead {
    font-size: 0.95rem;
  }

  .form {
    gap: 0.85rem;
  }

  .form-actions {
    flex-direction: column;
    align-items: stretch;
  }

  button,
  .ghost {
    width: 100%;
    text-align: center;
  }

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

  .root-banner {
    padding: 1rem;
  }

  table {
    font-size: 0.9rem;
  }

  .merkle-level {
    padding: 0.65rem 0.75rem;
  }
}

@media (max-width: 460px) {
  .metric-copy {
    font-size: 0.85rem;
  }

  .input-with-toggle,
  .field input {
    font-size: 0.95rem;
  }

  .root-value {
    font-size: 0.95rem;
  }

  th,
  td {
    padding: 0.45rem 0.35rem;
  }
}