* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #0a0a0b;
    --panel: #111114;
    --panel-2: #16161a;
    --border: #2a2a2f;
    --border-bright: #3a3a42;
    --text: #d4d4d8;
    --text-dim: #6b6b73;
    --text-mute: #4a4a52;
    --accent: #ff7a1a;
    --accent-dim: #a04e10;
    --grid: #18181c;
}

html, body {
    height: 100%;
}

body {
    font-family: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, Monaco, monospace;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    position: relative;
    overflow-x: hidden;
}

.grid-bg {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(var(--grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 520px;
    background: var(--panel);
    border: 1px solid var(--border);
    padding: 0;
}

.container::before,
.container::after {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    border: 1px solid var(--accent);
}

.container::before {
    top: -1px;
    left: -1px;
    border-right: none;
    border-bottom: none;
}

.container::after {
    bottom: -1px;
    right: -1px;
    border-left: none;
    border-top: none;
}

.head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.65rem 1rem;
    background: var(--panel-2);
    border-bottom: 1px solid var(--border);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
}

.head-left {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.version {
    color: var(--text-mute);
}

.title-block {
    padding: 2rem 1.5rem 1.5rem;
    border-bottom: 1px solid var(--border);
    position: relative;
}

.label-sm {
    font-size: 0.65rem;
    letter-spacing: 0.25em;
    color: var(--text-mute);
    margin-bottom: 0.5rem;
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--text);
    line-height: 1;
}

.title-meta {
    margin-top: 0.6rem;
    font-size: 0.75rem;
    color: var(--accent);
    letter-spacing: 0.15em;
}

.panel {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.68rem;
    letter-spacing: 0.15em;
    color: var(--text-dim);
    margin-bottom: 0.7rem;
}

.panel-tag {
    background: var(--panel-2);
    border: 1px solid var(--border);
    padding: 0.15rem 0.5rem;
    color: var(--accent);
    font-weight: 600;
}

.field {
    display: flex;
    align-items: baseline;
    background: var(--panel-2);
    border: 1px solid var(--border);
    padding: 0.85rem 1rem;
    transition: border-color 0.15s;
}

.field:focus-within {
    border-color: var(--accent);
    box-shadow: inset 0 0 0 1px var(--accent-dim);
}

input[type="number"] {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text);
    font-family: inherit;
    font-size: 1.6rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    width: 100%;
    -moz-appearance: textfield;
    caret-color: var(--accent);
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"]::placeholder {
    color: var(--text-mute);
    font-weight: 400;
}

.unit {
    margin-left: 0.75rem;
    color: var(--text-dim);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    font-weight: 500;
}

.bridge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1.5rem;
    border-bottom: 1px solid var(--border);
    background: var(--panel-2);
}

.bridge-line {
    flex: 1;
    height: 1px;
    background: repeating-linear-gradient(
        90deg,
        var(--border-bright) 0 4px,
        transparent 4px 8px
    );
}

.bridge-mark {
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 0.2em;
}

.controls {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.btn {
    width: 100%;
    background: var(--panel-2);
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 0.85rem;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--panel);
}

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

.btn-bracket {
    color: var(--text-mute);
    transition: color 0.15s;
}

.btn:hover .btn-bracket {
    color: var(--accent);
}

.foot {
    padding: 1rem 1.5rem;
    background: var(--panel-2);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
}

.foot-row {
    display: flex;
    justify-content: space-between;
    color: var(--text-mute);
    padding: 0.2rem 0;
}

.foot-key {
    color: var(--text-dim);
}

.foot-val {
    color: var(--text);
    font-weight: 500;
}

@media (max-width: 480px) {
    h1 { font-size: 1.4rem; }
    .title-block, .panel, .controls, .foot { padding-left: 1rem; padding-right: 1rem; }
    .head { padding-left: 0.75rem; padding-right: 0.75rem; }
}