:root {
    color-scheme: dark;
    --bg: #111111;
    --panel: #181818;
    --panel-subtle: #151515;
    --border: #3a3a3a;
    --border-strong: #555555;
    --text: #f0f0f0;
    --muted: #9a9a9a;
    --button: #222222;
    --button-primary: #2d5fd3;
    --button-hover: #1b1b1b;
    --button-active: #151515;
    --button-primary-hover: #244fb0;
    --button-primary-active: #1d408e;
    --button-disabled: #1d1d1d;
    --focus: #7aa7ff;
    --danger: #ff9e9e;
    --font-sans: "Segoe UI", Tahoma, Arial, sans-serif;
    --font-mono: "Consolas", "Courier New", monospace;
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    line-height: 1.5;
}

body {
    padding: 16px;
}

code,
input,
select,
textarea {
    font-family: var(--font-mono);
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

a {
    color: inherit;
}

input,
select,
textarea,
button {
    color: inherit;
    font: inherit;
}

input::placeholder,
textarea::placeholder {
    color: var(--muted);
    opacity: 1;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 2px;
}

.page-shell {
    max-width: 1100px;
    margin: 0 auto;
}

.page-header-row > *,
.layout-grid > *,
.host-field-row > *,
.toolbar > *,
.toolbar-group > * {
    min-width: 0;
}

.page-header {
    margin-bottom: 16px;
}

.page-header-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: start;
    gap: 12px;
    margin-bottom: 8px;
}

.page-header h1 {
    margin-bottom: 0;
    font-size: 28px;
}

.header-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-end;
}

.intro {
    color: var(--muted);
    margin: 0;
    font-size: 0.95rem;
}

.panel {
    border: 1px solid var(--border);
    background: var(--panel);
    padding: 16px;
    min-width: 0;
}

.layout-grid > .panel {
    margin-bottom: 0;
}

.blocks-status {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    color: var(--muted);
    font-size: 0.875rem;
}

.blocks-status:not([hidden]) {
    margin-bottom: 12px;
}

.blocks-status-label {
    color: var(--muted);
}

.blocks-status-value {
    color: var(--text);
    font-size: 0.875rem;
}

.blocks-status-value-muted {
    color: var(--muted);
}

.blocks-hint {
    margin: 0;
    color: var(--muted);
    font-size: 0.875rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.blocks-hint-label {
    color: var(--muted);
}

.payload-protocol-hint {
    margin: 10px 0 16px 0;
}

.protocol-category-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 34px;
    padding: 0 10px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.03);
    color: #cfcfcf;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
    user-select: none;
}

.protocol-category-chip-icon {
    width: 14px;
    height: 14px;
    display: inline-block;
    object-fit: contain;
    filter: brightness(0) invert(1) drop-shadow(0 0 0.5px rgba(0, 0, 0, 0.9));
}

.payload-protocol-hint-row {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 8px;
    align-items: baseline;
}

.payload-protocol-hint-row-nowrap {
    flex-wrap: nowrap;
    min-width: 0;
    overflow: hidden;
}

.payload-protocol-hint-links {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 8px;
}

.payload-protocol-hint-message {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preset-hint-link {
    padding: 0;
    border: 0;
    background: none;
    color: var(--text);
    cursor: pointer;
    font: inherit;
    text-align: left;
    text-decoration: underline;
    text-underline-offset: 0.18em;
}

.preset-hint-link:hover,
.preset-hint-link:focus-visible {
    color: var(--focus);
}

.preset-hint-link-muted {
    color: var(--muted);
}

.preset-hint-link-muted:hover,
.preset-hint-link-muted:focus-visible {
    color: var(--text);
}

.layout-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: 16px;
}

.controls-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    background: var(--panel);
    padding: 16px;
}

.controls-left,
.controls-right {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.reset-btn {
    margin-left: 0;
}

.add-payload-btn::after {
    content: " (i" attr(data-next-index) ")";
    color: var(--muted);
    font-weight: 600;
}

.field {
    display: block;
}

.field-inline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-wrap: nowrap;
}

.field-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
}

.field-inline .field-label {
    margin-bottom: 0;
    white-space: nowrap;
}

.toolbar-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.compact-field {
    min-width: 160px;
}

.field-inline.compact-field {
    min-width: 0;
}

input.mtu-input {
    width: calc(var(--mtu-input-chars, 4) * 1ch + 3.5rem);
    min-width: 6.5ch;
    max-width: 100%;
    flex: 0 0 auto;
    appearance: textfield;
}

.toolbar-checkbox {
    display: inline-flex;
    align-items: center;
    min-height: auto;
}

input:not([type="checkbox"]),
select,
textarea,
.btn {
    border: 1px solid var(--border-strong);
    background: var(--panel-subtle);
    padding: 8px 10px;
    font-size: 14px;
}

input:not([type="checkbox"]):not(.mtu-input),
select {
    width: 100%;
}

input.mtu-input::-webkit-outer-spin-button,
input.mtu-input::-webkit-inner-spin-button {
    margin: 0;
    -webkit-appearance: none;
}

.payload-protocol.protocol-select-favorite {
    color: var(--text);
}

.payload-protocol.protocol-select-muted {
    color: var(--muted);
}

.payload-protocol option.protocol-option-recommended {
    color: var(--text);
    font-weight: 600;
}

.payload-protocol option.protocol-option-unconfirmed {
    color: var(--muted);
}

textarea {
    width: 100%;
    resize: vertical;
    min-height: 280px;
}

.btn {
    background: var(--button);
    cursor: pointer;
    text-decoration: none;
    transition: background-color 120ms ease, border-color 120ms ease, transform 80ms ease, box-shadow 120ms ease;
}

.btn-primary {
    background: var(--button-primary);
}

.btn:hover,
.btn:focus-visible {
    background: var(--button-hover);
}

.btn:active:not(:disabled) {
    transform: translateY(1px);
    box-shadow: inset 0 2px 0 rgba(0, 0, 0, 0.28);
    background: var(--button-active);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--button-primary-hover);
}

.btn-primary:active:not(:disabled) {
    background: var(--button-primary-active);
}

.btn:disabled {
    color: var(--muted);
    background: var(--button-disabled);
    cursor: not-allowed;
}

.btn-compact {
    padding: 3px 8px;
    font-size: 12px;
    line-height: 1;
    min-height: auto;
}

.icon-btn,
.donate-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    min-width: 42px;
    padding: 8px;
}

.btn-icon {
    display: inline-flex;
    width: 1.1rem;
    height: 1.1rem;
    vertical-align: -0.125em;
}

.btn-icon svg {
    width: 100%;
    height: 100%;
    fill: currentColor;
}

.payload-blocks {
    display: grid;
    gap: 12px;
}

.payload-block {
    border: 1px solid var(--border);
    background: var(--panel-subtle);
    padding: 12px;
}

.block-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 0 0 12px;
    font-size: 16px;
    font-weight: 600;
    min-height: 39px;
}

.block-title-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1 1 auto;
    min-width: 0;
}

.block-title-actions .payload-protocol {
    flex: 1 1 auto;
    width: 100%;
    min-width: 0;
}

.block-title .remove-payload-btn[hidden] {
    visibility: hidden;
    pointer-events: none;
}


.payload-dynamic-fields {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
    gap: 10px 12px;
    margin-bottom: 8px;
}

.span-12 {
    grid-column: span 12;
}

.span-6 {
    grid-column: span 6;
}

.span-4 {
    grid-column: span 4;
}

.payload-dynamic-fields > * {
    min-width: 0;
}

.payload-static-fields {
    margin-bottom: 10px;
}

.field-wide {
    grid-column: span 12;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-field {
    display: flex;
    align-items: center;
    min-height: 36px;
    font-size: 14px;
}

.checkbox-row input {
    margin-top: 3px;
}

.checkbox-label {
    font-weight: 600;
}

.checkbox-label-muted {
    font-weight: 400;
    color: var(--muted);
}

.host-field-row {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: nowrap;
    min-width: 0;
    font-size: 14px;
}

.host-field-row select {
    flex: 1 1 10rem;
    min-width: min(100%, 10rem);
}

.host-field {
    align-content: start;
}

.host-field-row input[type="text"] {
    flex: 1 1 14rem;
    min-width: min(100%, 14rem);
}

.host-field-actions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.inline-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 36px;
    padding: 0;
    color: var(--muted);
    white-space: nowrap;
}

.inline-checkbox input {
    margin: 0;
}

.output-field {
    margin-bottom: 12px;
}

.payload-error {
    min-height: 18px;
    margin: 8px 0 0;
    color: var(--danger);
    font-size: 13px;
}

.dialog-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.68);
    backdrop-filter: blur(3px);
}

.dialog-card {
    width: min(100%, 420px);
    border: 1px solid var(--border-strong);
    background: linear-gradient(180deg, rgba(24, 24, 24, 0.98), rgba(17, 17, 17, 0.98));
    box-shadow: 0 22px 60px rgba(0, 0, 0, 0.5);
    padding: 18px;
}

.dialog-eyebrow {
    margin: 0 0 8px;
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.dialog-title {
    margin: 0 0 8px;
    font-size: 1.15rem;
}

.dialog-message {
    margin: 0;
    color: #d5d5d5;
}

.dialog-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 16px;
}

.hidden {
    display: none;
}

@media (max-width: 900px) {
    .layout-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    body {
        padding: 10px;
    }

    .panel {
        padding: 12px;
    }

    .page-header-row,
    .button-row {
        width: 100%;
    }

    .page-header-row {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: center;
        gap: 8px;
    }

    .header-actions {
        width: auto;
        justify-content: flex-end;
        flex-wrap: nowrap;
    }

    .header-actions .btn,
    .button-row .btn {
        flex: 1 1 100%;
    }

    .header-actions .icon-btn,
    .header-actions .donate-btn {
        flex: 0 0 auto;
        width: 42px;
    }

    .page-header h1 {
        font-size: 24px;
        line-height: 1.1;
    }

    .controls-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .controls-left,
    .controls-right {
        width: 100%;
    }

    .controls-left .btn,
    .controls-right .btn {
        flex: 1 1 0;
    }

    .toolbar-group {
        width: auto;
        align-items: center;
    }

    .field-inline {
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    .block-title {
        width: 100%;
        height: auto;
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        margin-bottom: 10px;
    }

    .block-title-actions {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .block-title-actions .payload-protocol,
    .block-title-actions .remove-payload-btn {
        width: 100%;
    }

    .host-field-row {
        flex-direction: row;
        align-items: center;
        flex-wrap: wrap;
        gap: 8px 10px;
    }

    .host-field-row .inline-checkbox {
        flex: 0 0 auto;
    }

    .host-field-row input[type="text"],
    .host-field-row select {
        flex: 1 1 0;
        width: auto;
        min-width: 0;
    }

    .host-field-actions {
        width: 100%;
        flex-wrap: wrap;
    }

    .host-field-actions .btn {
        flex: 1 1 100%;
    }

    .checkbox-row {
        flex-direction: row;
        align-items: center;
        flex-wrap: wrap;
        gap: 8px 10px;
    }

    .checkbox-row .toolbar-group {
        width: auto;
        margin-left: auto;
        flex: 0 0 auto;
    }

    .inline-checkbox {
        white-space: normal;
    }

    .payload-dynamic-fields {
        grid-template-columns: 1fr;
    }

    .payload-dynamic-fields > * {
        grid-column: 1 / -1;
    }

    .payload-protocol-hint-row {
        align-items: flex-start;
    }

    .payload-protocol-hint-message {
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
    }

    .dialog-actions .btn {
        flex: 1 1 100%;
    }
}