:root {
  --bg: #f4f7fb;
  --bg-2: #e8eef6;
  --bg-3: #dde6f0;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-strong: #1c2430;
  --text: #17202b;
  --muted: #596978;
  --line: rgba(23, 32, 43, 0.12);
  --accent: #4f87e8;
  --accent-deep: #2f64c7;
  --accent-soft: rgba(79, 135, 232, 0.14);
  --shadow: 0 18px 44px rgba(26, 41, 59, 0.1);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --shell-width: min(720px, calc(100% - 28px));
  --error: #c73e4d;
  --warning: #b8860b;
  --mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
}

body[data-theme="default"] {
  --bg: #f4f7fb;
  --bg-2: #e8eef6;
  --bg-3: #dde6f0;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-strong: #1c2430;
  --text: #17202b;
  --muted: #596978;
  --line: rgba(23, 32, 43, 0.12);
  --accent: #4f87e8;
  --accent-deep: #2f64c7;
  --accent-soft: rgba(79, 135, 232, 0.14);
  --shadow: 0 18px 44px rgba(26, 41, 59, 0.1);
}

body[data-theme="aero"] {
  --bg: #d8ecff;
  --bg-2: #c2e0ff;
  --bg-3: #a9cbef;
  --panel: rgba(243, 250, 255, 0.76);
  --panel-strong: #0d1724;
  --text: #102235;
  --muted: #54708c;
  --line: rgba(64, 99, 139, 0.32);
  --accent: #1f78ff;
  --accent-deep: #0b58d1;
  --accent-soft: rgba(31, 120, 255, 0.16);
  --shadow: 0 18px 38px rgba(34, 71, 112, 0.22);
  --aero-sheen: linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.1));
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(79, 135, 232, 0.22), transparent 28%),
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.38), transparent 18%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 58%, var(--bg-3) 100%);
}

body[data-theme="aero"] {
  background:
    url("aero-bg.svg") center center / cover no-repeat fixed,
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 58%, var(--bg-3) 100%);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.page-shell {
  width: var(--shell-width);
  margin: 0 auto;
  padding: 18px 0 32px;
}

.theme-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 50;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  box-shadow: var(--shadow);
  cursor: pointer;
}

.theme-menu {
  position: fixed;
  top: 68px;
  right: 16px;
  z-index: 49;
  display: grid;
  gap: 8px;
  min-width: 180px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.theme-menu__item {
  border: 0;
  border-radius: 12px;
  padding: 10px 12px;
  background: var(--accent-soft);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.topbar,
.panel,
.footer,
.hero__content {
  backdrop-filter: blur(14px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow);
}

body[data-theme="aero"] .topbar,
body[data-theme="aero"] .panel,
body[data-theme="aero"] .hero__content,
body[data-theme="aero"] .footer,
body[data-theme="aero"] .theme-menu,
body[data-theme="aero"] .theme-toggle,
body[data-theme="aero"] .feature-card {
  border-color: rgba(255, 255, 255, 0.72);
  background-image: var(--aero-sheen);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.85),
    0 10px 24px rgba(34, 71, 112, 0.18);
}

body[data-theme="aero"] .topbar {
  border-radius: 18px;
  background-color: rgba(233, 244, 255, 0.82);
}

body[data-theme="aero"] .topbar__links a,
body[data-theme="aero"] .footer a {
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.55);
}

body[data-theme="aero"] .panel,
body[data-theme="aero"] .hero__content {
  background-color: rgba(236, 246, 255, 0.8);
}

body[data-theme="aero"] .footer {
  background-color: rgba(18, 34, 55, 0.94);
}

body[data-theme="aero"] .theme-toggle {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  color: #0a3e93;
}

body[data-theme="aero"] .theme-menu {
  background-color: rgba(243, 250, 255, 0.92);
  border-radius: 14px;
}

body[data-theme="aero"] .theme-menu__item {
  background: linear-gradient(180deg, #fefefe, #cfe5ff);
  border: 1px solid rgba(76, 118, 166, 0.3);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.brand,
.hero h1,
.section-heading h2 {
  font-family: "Syne", sans-serif;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand__logo {
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
}

.topbar__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero__content {
  padding: 20px;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.84), rgba(245, 249, 255, 0.58));
  box-shadow: var(--shadow);
}

.tool-hero {
  display: block;
}

.tool-hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent-deep);
}

body[data-theme="aero"] .eyebrow,
body[data-theme="aero"] .feature-card__label {
  color: #0d56c0;
}

.hero__lede {
  max-width: 62ch;
  margin: 14px 0 0;
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--muted);
}

main {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.panel {
  padding: 18px;
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.66);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.section-heading {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.2rem, 2.8vw, 1.6rem);
  line-height: 1;
  letter-spacing: -0.05em;
}

.field-group {
  margin-bottom: 0.25rem;
}

label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.field-hint {
  margin: 0 0 0.6rem;
  font-size: 0.88rem;
  color: var(--muted);
}

code {
  font-family: var(--mono);
  font-size: 0.82em;
  background: rgba(79, 135, 232, 0.08);
  padding: 0.1em 0.4em;
  border-radius: 5px;
  color: var(--accent-deep);
}

input[type="text"] {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--mono);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--text);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

body[data-theme="aero"] input[type="text"] {
  background: linear-gradient(180deg, #fdfefe 0%, #e8f2ff 100%);
  border-color: rgba(76, 118, 166, 0.3);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

input[type="text"]::placeholder {
  color: var(--muted);
  opacity: 0.7;
}

input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.25rem 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 150ms ease, background 150ms ease, color 150ms ease;
  border: none;
  cursor: pointer;
}

.button:hover { transform: translateY(-1px); }
.button--primary { background: var(--accent); color: #fffaf5; }
.button--ghost { border: 1px solid var(--line); background: rgba(255, 255, 255, 0.55); }

body[data-theme="aero"] .button--primary,
body[data-theme="aero"] .button--ghost {
  border: 1px solid rgba(52, 102, 164, 0.34);
  border-radius: 12px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.86),
    0 1px 0 rgba(255, 255, 255, 0.4);
}

body[data-theme="aero"] .button--primary {
  background: linear-gradient(180deg, #8dc2ff 0%, #4f8ff4 48%, #1f6fe9 49%, #1d61d6 100%);
  color: #f8fcff;
}

body[data-theme="aero"] .button--ghost {
  background: linear-gradient(180deg, #fdfefe 0%, #dcecff 100%);
  color: #163658;
}

.results.hidden { display: none; }

.results {
  display: grid;
  gap: 14px;
}

.results-panel,
.error-panel,
.warning-panel {
  animation: fadeUp 0.35s ease;
}

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

.error-panel {
  border-color: rgba(199, 62, 77, 0.35);
  background: linear-gradient(180deg, rgba(199, 62, 77, 0.08), rgba(255, 255, 255, 0.82));
}

.error-panel h2 {
  margin: 0 0 0.5rem;
  color: var(--error);
  font-family: "Syne", sans-serif;
  font-size: 1.1rem;
}

.error-panel p { margin: 0; }

.warning-panel {
  border-color: rgba(184, 134, 11, 0.35);
  background: linear-gradient(180deg, rgba(240, 193, 75, 0.12), rgba(255, 255, 255, 0.82));
  padding: 1rem 1.25rem;
}

.warning-panel p {
  margin: 0;
  color: #8a6914;
  font-size: 0.95rem;
}

.result-block + .result-block {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.result-block h3 {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.result-summary {
  margin: 0 0 1rem;
  font-family: "Syne", sans-serif;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

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

.result-field {
  display: grid;
  gap: 0.2rem;
}

.result-label {
  font-size: 0.8rem;
  color: var(--muted);
}

.result-value {
  font-size: 1rem;
}

.result-value.mono {
  font-family: var(--mono);
  letter-spacing: 0.03em;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  vertical-align: middle;
}

body[data-theme="aero"] .chip {
  background: linear-gradient(180deg, #f9fbff, #c8ddf8);
  color: #114d9a;
  border: 1px solid rgba(94, 134, 179, 0.24);
}

.result-note {
  margin: 1rem 0 0;
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
  color: var(--muted);
  background: rgba(79, 135, 232, 0.06);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
  line-height: 1.6;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.feature-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(79, 135, 232, 0.1), rgba(255, 255, 255, 0.5)), #f8fbff;
}

body[data-theme="aero"] .feature-card {
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(204, 226, 247, 0.76));
}

.feature-card__label {
  margin: 0 0 10px;
  color: var(--accent-deep);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.ref-list {
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

.ref-list dt {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
}

.ref-list dd {
  margin: 0 0 0.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
  padding: 20px 22px;
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.66);
  background: rgba(16, 24, 40, 0.94);
  color: rgba(245, 251, 255, 0.92);
}

body[data-theme="aero"] .footer {
  background:
    linear-gradient(180deg, rgba(54, 91, 137, 0.96), rgba(20, 43, 72, 0.98)),
    rgba(16, 24, 40, 0.94);
}

.footer p { margin: 0; }
.footer a { color: #9bc0ff; }
.footer-sep { margin: 0 8px; color: rgba(245, 251, 255, 0.38); }

@media (max-width: 640px) {
  .page-shell { width: min(100% - 16px, 720px); padding-top: 12px; }
  .topbar { padding: 14px; border-radius: 20px; flex-direction: column; align-items: flex-start; }
  .topbar__links { flex-direction: column; align-items: flex-start; }
  .hero__content,
  .panel,
  .footer { padding: 14px; border-radius: 18px; }
  .reference-grid { grid-template-columns: 1fr; }
  .footer { display: grid; }
}

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

@media (min-width: 980px) {
  .reference-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}