:root {
    --ink: #0e1116;
    --panel: #11161d;
    --panel2: #0c1117;
    --line: #232a33;
    --line2: #2c3540;
    --text: #e6edf3;
    --muted: #8b98a5;
    --green: #2ecc71;
    --green-d: #27ad60;
    --blue: #3b82f6;
    --blue-d: #2f6fd6;
    --red: #e5534b;
    --red-d: #cf463f;
    --grey: #7d8794;
    --grey-d: #6b7682;
    --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--ink);
    color: var(--text);
    font-family: var(--sans);
    -webkit-font-smoothing: antialiased;
}

/* ---- top bar ---- */
.bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #121821;
    border-bottom: 1px solid var(--line);
    padding: 12px 18px;
}

.bar-left {
    display: flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
}

.dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 8px var(--green);
    flex: none;
}

.bar-title {
    font-weight: 700;
    white-space: nowrap;
}

.bar-sub {
    color: var(--muted);
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.bar-url {
    color: var(--muted);
    font-family: var(--mono);
    font-size: 12px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 45%;
}

/* ---- grid ---- */
.grid {
    display: grid;
    grid-template-columns: minmax(320px, 420px) 1fr;
    gap: 16px;
    padding: 16px;
    max-width: 1200px;
    margin: 0 auto;
    align-items: start;
}

/* ---- left controls ---- */
.left {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.fields {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.f {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

.f.wide {
    grid-column: 1 / -1;
}

.f label {
    font-size: 12px;
    color: #b6c2cd;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.f input {
    width: 100%;
    background: #1b232d;
    border: 1px solid #33404d;
    color: #f3f7fb;
    font-family: var(--mono);
    font-size: 16px;
    padding: 11px 12px;
    border-radius: 8px;
    outline: none;
}

.f input::placeholder {
    color: #5b6b79;
}

.f input:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 2px rgba(46, 204, 113, .18);
}

.f input[readonly] {
    color: var(--muted);
}

/* ---- ussd input ---- */
.inputbox {
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
}

.inputbox-h {
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.04em;
    padding: 8px 12px;
    border-bottom: 1px solid var(--line);
    background: var(--panel2);
}

.input {
    min-height: 44px;
    padding: 10px 12px;
    font-family: var(--mono);
    font-size: 18px;
    letter-spacing: 0.06em;
    color: var(--text);
    word-break: break-all;
}

.input[data-empty="true"] {
    color: #51606e;
    font-size: 14px;
    letter-spacing: normal;
}

/* ---- keypad ---- */
.keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 7px;
}

.key {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1px;
    padding: 7px 0;
    background: #1b222b;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--text);
    cursor: pointer;
    transition: background .1s, border-color .1s;
}

.key:hover {
    background: #222b35;
    border-color: var(--line2);
}

.key:active {
    background: #161c24;
}

.kn {
    font-size: 15px;
    font-weight: 600;
}

.kl {
    font-size: 8px;
    color: var(--muted);
    letter-spacing: 0.12em;
    min-height: 9px;
}

/* ---- action buttons ---- */
.rowbtns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 7px;
}

.rowbtns.one {
    grid-template-columns: 1fr;
}

.btn {
    border: none;
    border-radius: 8px;
    padding: 10px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.03em;
    cursor: pointer;
    color: #fff;
    transition: filter .1s, background .1s;
}

.btn:active {
    transform: translateY(1px);
}

.grey {
    background: var(--grey);
}

.grey:hover {
    background: var(--grey-d);
}

.red {
    background: var(--red);
}

.red:hover {
    background: var(--red-d);
}

.green {
    background: var(--green);
    color: #06180e;
}

.green:hover {
    background: var(--green-d);
}

.blue {
    background: var(--blue);
}

.blue:hover {
    background: var(--blue-d);
}

.btn:disabled {
    opacity: .5;
    cursor: default;
}

/* ---- right panels ---- */
.right {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.panel {
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
    background: var(--panel);
}

.panel-h {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.04em;
    padding: 10px 14px;
    border-bottom: 1px solid var(--line);
    background: #0f151c;
}

.out {
    margin: 0;
    padding: 16px;
    font-family: var(--mono);
    font-size: 14px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
    min-height: 180px;
    max-height: 420px;
    overflow: auto;
    color: #d6e2ec;
}

.out.err {
    color: var(--red);
}

/* ---- responsive ---- */
@media (max-width: 860px) {
    .grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .left {
        order: 2;
    }

    .right {
        order: 1;
    }

    .out {
        min-height: 120px;
        max-height: 300px;
    }
}

@media (max-width: 480px) {
    .bar {
        padding: 10px 14px;
    }

    .bar-sub {
        display: none;
    }

    .grid {
        padding: 12px;
    }

    .input {
        font-size: 18px;
        min-height: 44px;
    }

    .key {
        padding: 10px 0;
    }

    .kn {
        font-size: 16px;
    }

    .btn {
        padding: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}