button, input, select { font: inherit; color: inherit; }
.noise { position: fixed; inset: 0; opacity: .2; pointer-events: none; z-index: 10; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.08'/%3E%3C/svg%3E"); }
main { position: relative; z-index: 11; }

.fr-hero { max-width: 720px; margin: 0 auto; padding: 54px 24px 4px; text-align: center; }
.fr-hero .kicker { color: var(--g-2); text-transform: uppercase; letter-spacing: 1.2px; font-size: 12px; font-weight: 700; }
.fr-hero h1 { font-size: clamp(38px, 6vw, 64px); line-height: 1.02; letter-spacing: -2px; margin: 14px 0 12px; font-weight: 600; }
.fr-tagline { color: var(--muted); font-size: 15px; line-height: 1.5; max-width: 540px; margin: 0 auto; }

.fr-tabs { max-width: 680px; margin: 26px auto 0; display: flex; gap: 6px; padding: 6px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 15px; }
.fr-tab { flex: 1; padding: 11px 10px; border: 0; border-radius: 11px; background: transparent; cursor: pointer; font-size: 13px; font-weight: 700; color: var(--g-2); text-transform: uppercase; letter-spacing: .4px; transition: .18s; }
.fr-tab:hover { color: var(--ink); }
.fr-tab.active { background: var(--surface); color: var(--ink); box-shadow: 0 4px 14px rgba(0,0,0,.08); }

.fr-panel { max-width: 680px; margin: 16px auto 0; padding: 26px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); box-shadow: var(--shadow); }
.fr-intro { margin: 0 0 18px; color: var(--muted); font-size: 14px; line-height: 1.55; }

.fr-presets { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 16px; }
.fr-presets-label { color: var(--g-2); text-transform: uppercase; letter-spacing: .7px; font-size: 11px; font-weight: 700; margin-right: 4px; }
.fr-presets button { padding: 8px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-2); cursor: pointer; font: 500 13px "DM Mono", monospace; transition: .18s; }
.fr-presets button:hover { border-color: var(--ink); transform: translateY(-1px); }

.fr-subtabs { display: flex; gap: 8px; margin-bottom: 16px; }
.fr-subtab { flex: 1; padding: 10px; border: 1px solid var(--line); border-radius: 11px; background: var(--surface-2); cursor: pointer; font-size: 12px; font-weight: 700; color: var(--g-2); text-transform: uppercase; letter-spacing: .4px; transition: .18s; }
.fr-subtab.active { background: var(--solid); color: #fff; border-color: var(--solid); }

.fr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
.fr-grid label, .fr-custom { display: flex; flex-direction: column; gap: 7px; color: var(--g-2); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .6px; }
.fr-grid input, .fr-grid select { width: 100%; padding: 13px 14px; border: 1px solid var(--line); border-radius: 11px; background: var(--surface); outline: 0; font-size: 14px; text-transform: none; letter-spacing: 0; }
.fr-grid input.mono { font-family: "DM Mono", monospace; letter-spacing: -.3px; }
.fr-grid input:focus, .fr-grid select:focus { border-color: var(--success); box-shadow: 0 0 0 3px rgba(185,245,111,.18); }

.fr-validation { margin: 14px 0 0; color: var(--danger); font-size: 13px; font-weight: 600; }

.fr-results { margin-top: 20px; padding-top: 6px; border-top: 1px solid var(--line); }
.fr-result-row { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding: 12px 0; border-bottom: 1px dashed var(--line); }
.fr-result-row span { color: var(--g-2); text-transform: uppercase; letter-spacing: .5px; font-size: 11px; font-weight: 700; }
.fr-result-row strong { font: 500 17px "DM Mono", monospace; letter-spacing: -.5px; text-align: right; }
.fr-explain { margin: 16px 0 0; padding: 14px 16px; border-radius: 13px; background: var(--surface-2); color: var(--ink-soft); font-size: 14px; line-height: 1.6; }
.fr-caption { margin: 10px 0 0; color: var(--g-3); font-size: 12px; line-height: 1.5; }
.fr-copy { margin-top: 18px; padding: 13px 18px; border: 1px solid var(--ink); border-radius: 12px; background: var(--solid); color: #fff; cursor: pointer; font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; box-shadow: 0 8px 18px rgba(0,0,0,.13); transition: .2s; }
.fr-copy:hover { transform: translateY(-2px); }

.toast { position: fixed; bottom: 25px; left: 50%; transform: translate(-50%, 30px); opacity: 0; pointer-events: none; z-index: 60; background: var(--solid); color: #fff; border-radius: 12px; padding: 12px 16px; font-size: 13px; display: flex; gap: 9px; align-items: center; transition: .3s; }
.toast span:first-child { color: var(--green); }
.toast.show { transform: translate(-50%, 0); opacity: 1; }

@media (max-width: 640px) {
  .fr-grid { grid-template-columns: 1fr; }
  .fr-tabs { flex-wrap: wrap; }
  .fr-tab { flex: 1 1 40%; }
  .fr-result-row strong { font-size: 15px; }
}