:root {
    --fpc-radius-xl: 28px;
    --fpc-radius-lg: 20px;
    --fpc-radius-md: 14px;
}

.fpc-app,
.fpc-app * {
    box-sizing: border-box;
}

.fpc-app {
    --fpc-bg: #060713;
    --fpc-panel: rgba(13, 18, 39, 0.92);
    --fpc-panel-2: rgba(17, 25, 54, 0.88);
    --fpc-text: #f7fbff;
    --fpc-muted: #a9b8d4;
    --fpc-primary: #28f5ff;
    --fpc-secondary: #ff38d1;
    --fpc-accent: #b9ff3d;
    --fpc-danger: #ff617d;
    --fpc-border: rgba(83, 244, 255, 0.22);
    --fpc-shadow: 0 24px 70px rgba(0, 0, 0, 0.42);

    position: relative;
    overflow: hidden;
    width: 100%;
    max-width: 1180px;
    margin: 24px auto;
    padding: 24px;
    color: var(--fpc-text);
    background:
        radial-gradient(circle at 8% 10%, rgba(40, 245, 255, 0.16), transparent 30%),
        radial-gradient(circle at 92% 8%, rgba(255, 56, 209, 0.15), transparent 30%),
        radial-gradient(circle at 82% 90%, rgba(185, 255, 61, 0.10), transparent 34%),
        var(--fpc-bg);
    border: 1px solid var(--fpc-border);
    border-radius: var(--fpc-radius-xl);
    box-shadow: var(--fpc-shadow), inset 0 0 40px rgba(40, 245, 255, 0.03);
    isolation: isolate;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.fpc-app[data-theme="magenta"] {
    --fpc-primary: #ff3edb;
    --fpc-secondary: #7c5cff;
    --fpc-accent: #39ffbf;
    --fpc-border: rgba(255, 62, 219, 0.26);
}

.fpc-app[data-theme="lime"] {
    --fpc-primary: #c8ff38;
    --fpc-secondary: #36f6ff;
    --fpc-accent: #ff4dc4;
    --fpc-border: rgba(200, 255, 56, 0.26);
}

.fpc-grid-glow {
    position: absolute;
    inset: 0;
    z-index: -1;
    opacity: 0.28;
    background-image:
        linear-gradient(rgba(74, 227, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(74, 227, 255, 0.06) 1px, transparent 1px);
    background-size: 34px 34px;
    mask-image: linear-gradient(to bottom, black, transparent 92%);
}

.fpc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 8px 6px 24px;
}

.fpc-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.fpc-logo {
    display: grid;
    place-items: center;
    flex: 0 0 auto;
    width: 66px;
    height: 66px;
    font-size: 34px;
    background: linear-gradient(145deg, rgba(40, 245, 255, 0.2), rgba(255, 56, 209, 0.18));
    border: 1px solid var(--fpc-border);
    border-radius: 20px;
    box-shadow: 0 0 24px rgba(40, 245, 255, 0.22), inset 0 0 20px rgba(255,255,255,0.04);
}

.fpc-eyebrow {
    margin: 0 0 5px !important;
    color: var(--fpc-primary);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.14em;
}

.fpc-brand h2 {
    margin: 0 !important;
    color: var(--fpc-text);
    font-size: clamp(25px, 4vw, 38px);
    line-height: 1.05;
    letter-spacing: -0.04em;
    text-shadow: 0 0 24px rgba(40, 245, 255, 0.2);
}

.fpc-brand p:last-child {
    margin: 7px 0 0 !important;
    color: var(--fpc-muted);
    font-size: 14px;
}

.fpc-toolbar {
    display: flex;
    gap: 9px;
}

.fpc-icon-button,
.fpc-copy,
.fpc-primary,
.fpc-secondary,
.fpc-category-button {
    appearance: none;
    border: 0;
    font: inherit;
    cursor: pointer;
    transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.fpc-icon-button {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    min-height: 42px;
    padding: 9px 12px;
    color: var(--fpc-muted);
    background: rgba(255,255,255,0.045);
    border: 1px solid rgba(255,255,255,0.09);
    border-radius: 12px;
}

.fpc-icon-button:hover,
.fpc-icon-button.is-active {
    color: var(--fpc-text);
    border-color: var(--fpc-border);
    box-shadow: 0 0 18px rgba(40,245,255,0.1);
}

.fpc-shell {
    display: grid;
    grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
    gap: 18px;
}

.fpc-sidebar,
.fpc-main {
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--fpc-radius-lg);
    background: linear-gradient(145deg, rgba(19, 27, 58, 0.86), rgba(9, 13, 30, 0.90));
    backdrop-filter: blur(14px);
}

.fpc-sidebar {
    padding: 18px;
}

.fpc-main {
    padding: clamp(19px, 4vw, 34px);
}

.fpc-label {
    display: block;
    margin-bottom: 8px;
    color: #dfeaff;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.fpc-search-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    background: rgba(2, 5, 17, 0.68);
    border: 1px solid rgba(255,255,255,0.09);
    border-radius: var(--fpc-radius-md);
}

.fpc-search-wrap:focus-within {
    border-color: var(--fpc-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--fpc-primary) 13%, transparent);
}

.fpc-search-wrap input {
    width: 100%;
    height: 44px;
    padding: 0;
    color: var(--fpc-text);
    background: transparent;
    border: 0;
    outline: 0;
    font: inherit;
    font-size: 14px;
}

.fpc-search-wrap input::placeholder {
    color: #71809f;
}

.fpc-category-list {
    display: grid;
    gap: 8px;
    margin-top: 18px;
    max-height: 560px;
    overflow: auto;
    padding-right: 4px;
}

.fpc-category-group {
    margin-top: 6px;
}

.fpc-category-title {
    display: block;
    margin: 14px 4px 7px;
    color: var(--fpc-muted);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.fpc-category-button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    padding: 11px 12px;
    color: #cbd8ee;
    text-align: left;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 12px;
}

.fpc-category-button:hover {
    color: var(--fpc-text);
    background: rgba(255,255,255,0.045);
}

.fpc-category-button.is-active {
    color: #06111b;
    font-weight: 800;
    background: linear-gradient(135deg, var(--fpc-primary), color-mix(in srgb, var(--fpc-primary) 62%, white));
    box-shadow: 0 0 22px color-mix(in srgb, var(--fpc-primary) 28%, transparent);
}

.fpc-category-button small {
    opacity: 0.72;
    font-size: 10px;
}

.fpc-formula-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    padding-bottom: 22px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.fpc-category-chip {
    display: inline-flex;
    margin-bottom: 9px;
    padding: 5px 10px;
    color: var(--fpc-primary);
    background: color-mix(in srgb, var(--fpc-primary) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--fpc-primary) 28%, transparent);
    border-radius: 999px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.fpc-formula-heading h3 {
    margin: 0 !important;
    color: var(--fpc-text);
    font-size: clamp(24px, 3vw, 34px);
    line-height: 1.1;
}

.fpc-formula-heading p {
    margin: 8px 0 0 !important;
    color: var(--fpc-muted);
}

.fpc-formula-badge {
    flex: 0 0 auto;
    max-width: 45%;
    padding: 13px 16px;
    color: var(--fpc-accent);
    background: rgba(2, 5, 17, 0.68);
    border: 1px solid color-mix(in srgb, var(--fpc-accent) 30%, transparent);
    border-radius: 13px;
    box-shadow: inset 0 0 18px color-mix(in srgb, var(--fpc-accent) 6%, transparent);
    font-family: "Courier New", monospace;
    font-size: 16px;
    font-weight: 800;
    text-align: center;
}

.fpc-form {
    padding-top: 24px;
}

.fpc-input-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.fpc-field {
    min-width: 0;
}

.fpc-field-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(92px, auto);
    overflow: hidden;
    background: rgba(2, 5, 17, 0.72);
    border: 1px solid rgba(255,255,255,0.10);
    border-radius: var(--fpc-radius-md);
}

.fpc-field-shell:focus-within {
    border-color: var(--fpc-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--fpc-primary) 12%, transparent), 0 0 24px color-mix(in srgb, var(--fpc-primary) 10%, transparent);
}

.fpc-field-shell input,
.fpc-field-shell select,
.fpc-output-row select {
    min-width: 0;
    height: 50px;
    color: var(--fpc-text);
    background: transparent;
    border: 0;
    outline: 0;
    font: inherit;
}

.fpc-field-shell input {
    width: 100%;
    padding: 0 14px;
    font-size: 16px;
    font-weight: 700;
}

.fpc-field-shell select {
    padding: 0 30px 0 10px;
    color: var(--fpc-primary);
    border-left: 1px solid rgba(255,255,255,0.08);
    font-size: 13px;
    font-weight: 800;
}

.fpc-field-shell select option,
.fpc-output-row select option {
    color: #111827;
    background: #ffffff;
}

.fpc-output-row {
    display: grid;
    grid-template-columns: minmax(180px, 300px);
    margin-top: 17px;
}

.fpc-output-row select {
    width: 100%;
    padding: 0 14px;
    background: rgba(2, 5, 17, 0.72);
    border: 1px solid rgba(255,255,255,0.10);
    border-radius: var(--fpc-radius-md);
}

.fpc-output-row select:focus {
    border-color: var(--fpc-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--fpc-primary) 12%, transparent);
}

.fpc-actions {
    display: flex;
    gap: 12px;
    margin-top: 22px;
}

.fpc-primary,
.fpc-secondary {
    min-height: 49px;
    padding: 12px 20px;
    border-radius: 14px;
    font-weight: 900;
}

.fpc-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    color: #041017;
    background: linear-gradient(135deg, var(--fpc-primary), var(--fpc-accent));
    box-shadow: 0 0 25px color-mix(in srgb, var(--fpc-primary) 26%, transparent);
}

.fpc-secondary {
    color: var(--fpc-text);
    background: rgba(255,255,255,0.055);
    border: 1px solid rgba(255,255,255,0.10);
}

.fpc-primary:hover,
.fpc-secondary:hover,
.fpc-icon-button:hover,
.fpc-copy:hover:not(:disabled) {
    transform: translateY(-1px);
}

.fpc-primary:active,
.fpc-secondary:active,
.fpc-icon-button:active,
.fpc-copy:active:not(:disabled) {
    transform: translateY(1px) scale(0.99);
}

.fpc-result {
    margin-top: 25px;
    padding: 22px;
    background:
        linear-gradient(145deg, color-mix(in srgb, var(--fpc-primary) 8%, transparent), rgba(2, 5, 17, 0.65));
    border: 1px solid color-mix(in srgb, var(--fpc-primary) 23%, transparent);
    border-radius: var(--fpc-radius-lg);
    box-shadow: inset 0 0 28px rgba(255,255,255,0.02);
}

.fpc-result.is-success {
    animation: fpcPulse 480ms ease;
}

.fpc-result.is-error {
    border-color: rgba(255, 97, 125, 0.55);
    box-shadow: 0 0 24px rgba(255, 97, 125, 0.08);
}

@keyframes fpcPulse {
    0% { transform: scale(0.995); box-shadow: 0 0 0 rgba(40,245,255,0); }
    55% { transform: scale(1.005); box-shadow: 0 0 32px color-mix(in srgb, var(--fpc-primary) 17%, transparent); }
    100% { transform: scale(1); }
}

.fpc-result-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.fpc-result-label {
    display: block;
    color: var(--fpc-muted);
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.14em;
}

.fpc-result-value {
    margin-top: 6px;
    color: var(--fpc-primary);
    font-size: clamp(26px, 5vw, 44px);
    font-weight: 900;
    line-height: 1.08;
    overflow-wrap: anywhere;
    text-shadow: 0 0 22px color-mix(in srgb, var(--fpc-primary) 27%, transparent);
}

.fpc-copy {
    padding: 9px 12px;
    color: var(--fpc-text);
    background: rgba(255,255,255,0.055);
    border: 1px solid rgba(255,255,255,0.11);
    border-radius: 11px;
    font-size: 13px;
    font-weight: 800;
}

.fpc-copy:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.fpc-solution {
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.fpc-solution h4 {
    margin: 0 0 10px !important;
    color: #e7efff;
    font-size: 14px;
}

.fpc-steps {
    display: grid;
    gap: 8px;
    color: var(--fpc-muted);
    font-size: 14px;
    line-height: 1.55;
}

.fpc-step-line {
    padding: 8px 10px;
    background: rgba(255,255,255,0.035);
    border-left: 3px solid var(--fpc-secondary);
    border-radius: 8px;
    overflow-wrap: anywhere;
}

.fpc-note {
    margin: 15px 2px 0 !important;
    color: #7f8daa;
    font-size: 12px;
    line-height: 1.5;
}

.fpc-empty {
    padding: 18px 10px;
    color: var(--fpc-muted);
    text-align: center;
    border: 1px dashed rgba(255,255,255,0.10);
    border-radius: 12px;
}

.fpc-error-text {
    color: var(--fpc-danger);
    font-weight: 800;
}

@media (max-width: 820px) {
    .fpc-app {
        padding: 14px;
        border-radius: 20px;
    }

    .fpc-header {
        align-items: flex-start;
    }

    .fpc-shell {
        grid-template-columns: 1fr;
    }

    .fpc-category-list {
        display: flex;
        max-height: none;
        overflow-x: auto;
        gap: 8px;
        padding: 2px 0 8px;
    }

    .fpc-category-group {
        display: contents;
    }

    .fpc-category-title {
        display: none;
    }

    .fpc-category-button {
        flex: 0 0 auto;
        width: auto;
        white-space: nowrap;
        background: rgba(255,255,255,0.035);
        border-color: rgba(255,255,255,0.07);
    }

    .fpc-category-button small {
        display: none;
    }
}

@media (max-width: 600px) {
    .fpc-header {
        display: grid;
    }

    .fpc-toolbar {
        margin-left: 82px;
    }

    .fpc-button-label {
        display: none;
    }

    .fpc-formula-heading {
        display: grid;
    }

    .fpc-formula-badge {
        max-width: 100%;
        width: 100%;
        text-align: left;
    }

    .fpc-input-grid {
        grid-template-columns: 1fr;
    }

    .fpc-output-row {
        grid-template-columns: 1fr;
    }

    .fpc-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .fpc-result-top {
        align-items: flex-start;
    }
}

@media (prefers-reduced-motion: reduce) {
    .fpc-app *,
    .fpc-app *::before,
    .fpc-app *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}