:root {
  --ink: #0b1f4b;
  --muted: #4f617a;
  --line: rgba(11, 31, 75, 0.18);
  --card: rgba(255, 255, 255, 0.88);
  --shadow: 0 1.1rem 3rem rgba(11, 31, 75, 0.12);
  --radius: 1.1rem;
}

* {
  box-sizing: border-box;
}

.app {
  max-width: 56rem;
  margin: 0 auto;
  padding: 1rem;
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.4;
}

@media (max-width: 480px) {
  .app { padding: 0.6rem; }
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.hero {
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(11, 31, 75, 0.08), rgba(120, 160, 255, 0.10));
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.4rem, 1.1rem + 1.2vw, 2.2rem);
  letter-spacing: 0.01em;
}

.subtitle {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-weight: 650;
}

.card {
  margin-top: 1rem;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow);
}

.msg {
  margin: 0 auto 0.7rem;
  max-width: 50rem;
  text-align: center;
  padding: 0.7rem 0.9rem;
  border-radius: 0.9rem;
  border: 1px solid transparent;
  min-height: 1.2rem;
}

.msg.is-ok {
  background: rgba(60, 170, 120, 0.10);
  border-color: rgba(60, 170, 120, 0.22);
}

.msg.is-err {
  background: rgba(170, 60, 80, 0.10);
  border-color: rgba(170, 60, 80, 0.25);
  font-weight: 750;
}

.field {
  display: grid;
  justify-items: center;
  gap: 0.45rem;
}

.label {
  font-weight: 850;
  text-align: center;
  font-size: 1.05rem;
}

.help {
  max-width: 50rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.input {
  box-sizing: border-box;
  border: 1px solid rgba(11, 31, 75, 0.28);
  border-radius: 0.8rem;
  padding: 0.7rem 0.85rem;
  font-size: 1.05rem;
  outline: none;
  background: rgba(255, 255, 255, 0.95);
  color: var(--ink);
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.input:focus {
  border-color: rgba(11, 31, 75, 0.55);
  box-shadow: 0 0 0 0.28rem rgba(120, 160, 255, 0.18);
}

.input-text {
  width: min(18rem, 100%);
  text-align: left;
}

.input-roman {
  text-align: center;
}

.actions {
  display: flex;
  justify-content: center;
  gap: 0.7rem;
  margin-top: 0.9rem;
}

@media (max-width: 520px) {
  .actions { flex-direction: column; align-items: stretch; }
}

.btn {
  box-sizing: border-box;
  border-radius: 0.95rem;
  padding: 0.75rem 1rem;
  font-weight: 850;
  font-size: 1.02rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 160ms ease, filter 160ms ease, background 160ms ease, border-color 160ms ease;
  width: 12rem;
  max-width: 100%;
}

@media (max-width: 520px) {
  .btn { width: 100%; }
}

.btn-primary {
  background: linear-gradient(135deg, #163a8a, #2a66ff);
  color: #ffffff;
  box-shadow: 0 0.8rem 2rem rgba(22, 58, 138, 0.22);
}

.btn-primary:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
  box-shadow: 0 1rem 2.4rem rgba(42, 102, 255, 0.22);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.65);
  color: var(--ink);
  border-color: rgba(11, 31, 75, 0.22);
}

.btn-ghost:hover {
  transform: translateY(-1px);
  background: rgba(120, 160, 255, 0.16);
}

.result {
  margin-top: 0.9rem;
  display: grid;
  justify-items: center;
  gap: 0.35rem;
}

.result-label {
  font-weight: 850;
  color: var(--muted);
}

.result-value {
  font-size: 1.25rem;
  text-align: center;
  padding: 0.65rem 0.9rem;
  border-radius: 0.9rem;
  border: 1px dashed rgba(11, 31, 75, 0.28);
  width: min(36rem, 100%);
  background: rgba(255, 255, 255, 0.7);
  overflow-wrap: anywhere;
  word-break: break-word;
  white-space: normal;
}

.h2 {
  margin: 0 0 0.7rem;
  text-align: left;
  font-size: 1.2rem;
}

.h3 {
  margin: 0 0 0.35rem;
  text-align: left;
  font-size: 1.05rem;
}

.p {
  margin: 0.6rem 0;
  text-align: left;
  max-width: 50rem;
}

.faq {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.7rem;
}

.faq-item {
  border: 1px solid rgba(11, 31, 75, 0.14);
  border-radius: 0.95rem;
  padding: 0.85rem 0.9rem;
  background: rgba(255, 255, 255, 0.72);
}

.examples .h2 {
  text-align: center;
}

.table-examples {
  width: min(22rem, 100%);
  border-collapse: collapse;
  margin: 0.25rem auto 0;
  border: 1px solid rgba(42, 102, 255, 0.35);
}

.table-examples td,
.table-examples th {
  border: 1px solid rgba(42, 102, 255, 0.35);
  padding: 0.55rem 0.6rem;
}

.td-num {
  text-align: right;
  width: 5.5rem;
}

.td-center {
  text-align: center;
  width: 5.5rem;
}

.footnote {
  margin: 0.8rem 0 0;
  text-align: center;
  color: var(--muted);
  font-weight: 650;
  font-size: 0.95rem;
}

.spacer {
  height: 0.7rem;
}

.footer {
  margin-top: 0.8rem;
  padding-bottom: 1.2rem;
}

.keywords {
  margin: 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.msg-gap {
  height: 0.65rem;
}

.viastar { all: revert; }
.viastar * { all: revert; }