:root {
    --blue: #075aa8;
    --blue-dark: #084780;
    --ink: #193148;
    --muted: #637487;
    --line: #cdd7e2;
    --bg: #edf2f8;
    --white: #fff;
    --radius: 12px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
    color: var(--ink);
    background: radial-gradient(ellipse at 0% 0%,#f8fbff 0,transparent 45%),linear-gradient(145deg,#e8eef7,#f6f8fc 75%);
    min-height: 100vh;
}

button, a, textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

button:disabled {
    opacity: .42;
    cursor: not-allowed;
}

button:focus-visible, a:focus-visible, textarea:focus-visible {
    outline: 3px solid #4ba3fa;
    outline-offset: 3px;
}

[hidden] {
    display: none!important;
}

.site-shell {
    max-width: 1120px;
    margin: 32px auto 56px;
    background: #e8edf4;
    border: 1px solid #d6e0eb;
    box-shadow: 0 16px 55px #42556f24;
    border-radius: 13px;
    overflow: hidden;
}

.topbar {
    height: 73px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    background: linear-gradient(130deg,#fbfdff,#e9eff6);
    border-top: 4px solid var(--blue);
    border-bottom: 1px solid var(--line);
}

.logo {
    display: flex;
    align-items: center;
    gap: 9px;
    color: var(--ink);
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -.65px;
    text-decoration: none;
    white-space: nowrap;
}

.logo-icon {
    display: grid;
    place-items: center;
    width: 31px;
    height: 31px;
    border-radius: 10px;
    color: white;
    background: var(--blue);
    font-size: 26px;
    line-height: 1;
}

.logo-light {
    font-weight: 600;
}

.topbar nav {
    display: flex;
    align-items: stretch;
    gap: 23px;
    height: 100%;
    margin-left: auto;
    margin-right: 27px;
}

.nav-link {
    padding: 24px 3px 19px;
    border-bottom: 3px solid transparent;
    color: #3b546d;
    text-decoration: none;
    font-size: 14px;
}

.nav-link.active {
    border-color: var(--blue);
    color: var(--blue);
}

.avatar {
    border: 0;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    background: linear-gradient(155deg,#e3e9f1,#b9c5d5);
    color: #243d57;
    font-size: 17px;
}

main {
    padding: 22px 24px 29px;
}

.view {
    animation: appear .23s ease;
}

@keyframes appear {
    from {
        opacity: .5;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.heading-box {
    text-align: center;
    padding: 24px 18px 21px;
    border-radius: 9px;
    border: 1px solid var(--line);
    background: linear-gradient(140deg,#f9fbfe,#eaf0f6);
    box-shadow: 0 4px 11px #293c5110;
    margin-bottom: 19px;
}

.overline {
    display: block;
    color: #477da9;
    letter-spacing: 1.8px;
    font-weight: 800;
    font-size: 10px;
    margin-bottom: 7px;
}

.heading-box h1 {
    font-size: clamp(23px,3vw,31px);
    letter-spacing: -.8px;
    margin: 0 0 5px;
}

.heading-box p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.panel {
    min-width: 0;
    margin-bottom: 18px;
    background: white;
    border: 1px solid var(--line);
    border-radius: 9px;
    box-shadow: 0 3px 10px #32465e0c;
    overflow: hidden;
}

.content-grid .panel {
    margin-bottom: 0;
}

.panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 45px;
    gap: 12px;
    padding: 10px 15px;
    background: linear-gradient(90deg,#f4f7fa,#ecf1f6);
    border-bottom: 1px solid var(--line);
}

.panel-head h2 {
    font-size: 16px;
    font-weight: 700;
    margin: 0;
}

.subtle {
    font-size: 12px;
    color: var(--muted);
}

.dropzone {
    width: calc(100% - 28px);
    height: 222px;
    margin: 14px;
    background: #f8fbfe;
    border: 2px dashed #c3d2e1;
    border-radius: 9px;
    display: grid;
    place-items: center;
    color: var(--ink);
    transition: background .2s,border-color .2s;
    overflow: hidden;
}

.dropzone:hover, .dropzone.dragging {
    background: #eef6ff;
    border-color: var(--blue);
}

#dropPrompt {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 7px;
}

.upload-icon {
    display: block;
    font-size: 43px;
    color: #6686a6;
    line-height: 1.1;
}

.dropzone strong {
    font-size: 16px;
}

.dropzone small {
    color: var(--muted);
    font-size: 13px;
}

.filetypes {
    font-size: 11px;
    color: #8a9aad;
    margin-top: 6px;
}

#imagePreview {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.btn {
    border-radius: 6px;
    min-height: 37px;
    padding: 8px 13px;
    border: 1px solid transparent;
    font-size: 13px;
    font-weight: 600;
    transition: filter .15s,background .15s;
}

.btn:hover, .switch-button:hover {
    filter: brightness(.96);
}

.btn-primary, .switch-button {
    background: linear-gradient(180deg,#126cba,#06579f);
    color: white;
    border-color: #07559b;
}

.btn-outline {
    background: linear-gradient(#fff,#f0f4f8);
    border-color: #9cabbc;
    color: #29425c;
}

.btn-full {
    width: calc(100% - 28px);
    margin: 0 14px 8px;
}

.status-text {
    font-size: 12px;
    color: var(--muted);
    line-height: 1.55;
    margin: 5px 14px 15px;
    min-height: 18px;
}

.status-text.error {
    color: #a83535;
}

.status-text.success {
    color: #156f50;
}

.result-panel {
    display: flex;
    flex-direction: column;
}

.result-panel textarea {
    flex: 1;
    border: 0;
    resize: vertical;
    min-height: 235px;
    outline: none;
    padding: 17px;
    font-size: 16px;
    color: #182b3a;
    background: white;
}

.result-panel textarea:not([readonly]) {
    background: #f8fcff;
}

.icon-button {
    border: 0;
    background: transparent;
    color: #194d78;
    display: grid;
    place-items: center;
    padding: 4px;
}

.icon-button svg {
    height: 22px;
    width: 22px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.button-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 9px;
    padding: 11px 13px;
    background: #f6f8fb;
    border-top: 1px solid var(--line);
}

.button-row.end {
    justify-content: flex-end;
}

.switch-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 13px;
    border-radius: 7px;
    width: 100%;
    min-height: 45px;
    padding: 12px;
    font-size: 15px;
    font-weight: 700;
    border-width: 1px;
    border-style: solid;
}

.switch-button span {
    font-size: 21px;
    font-weight: 400;
}

.input-area {
    width: 100%;
    min-height: 112px;
    padding: 17px;
    border: 0;
    resize: vertical;
    outline: none;
    font-size: 16px;
    line-height: 1.5;
    color: var(--ink);
}

.panel-action {
    padding: 11px 0;
    border-top: 1px solid var(--line);
    background: #f8fafc;
}

.panel-action .btn {
    margin-bottom: 0;
}

.braille-preview {
    min-height: 142px;
    padding: 18px 16px 13px;
    overflow: auto;
}

.braille-preview p {
    font-size: 18px;
    margin: 0 0 15px;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.cell-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 13px 10px;
}

.cell-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    min-width: 30px;
}

.cell-unit small {
    color: #7e90a3;
    font-size: 11px;
    max-width: 32px;
    overflow: hidden;
}

.dot-grid {
    display: grid;
    grid-template-rows: repeat(3,9px);
    grid-auto-flow: column;
    grid-template-columns: repeat(2,9px);
    gap: 3px;
}

.dot-grid i {
    display: block;
    width: 9px;
    height: 9px;
    background: #d8e0e9;
    border-radius: 50%;
}

.dot-grid i.active {
    background: #183c5b;
}

.status-pill {
    font-size: 11px;
    color: #326f7d;
    background: #e9f7f7;
    padding: 5px 9px;
    border-radius: 20px;
    white-space: nowrap;
}

.pulse-dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #27a58b;
    margin-right: 5px;
}

.bench-content {
    padding: 17px;
    display: grid;
    grid-template-columns: minmax(0,1.4fr) minmax(220px,.85fr);
    gap: 20px;
}

.bench-device {
    border-radius: 13px;
    background: linear-gradient(150deg,#46525f,#222f3a 65%,#19242e);
    color: white;
    padding: 18px;
    box-shadow: inset 0 2px 4px #ffffff1c,0 8px 16px #101b2926;
}

.device-header, .device-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    color: #b4c6d4;
    font-size: 10px;
    letter-spacing: 1.1px;
}

.device-emphasis {
    color: #66c3ff;
}

.device-main {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    padding: 25px 0 22px;
}

.bench-dots {
    display: grid;
    grid-auto-flow: column;
    grid-template-rows: repeat(3,42px);
    gap: 13px;
}

.bench-dots .pin {
    width: 37px;
    height: 37px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 29%,#89929b,#495765 55%,#1d2b35 90%);
    border: 2px solid #27303b;
    box-shadow: inset 1px 2px 4px #f0f5ff27,2px 5px 6px #0007;
    transition: background .15s,transform .15s,box-shadow .15s;
}

.bench-dots .pin.raised {
    background: radial-gradient(circle at 30% 24%,#eaffff,#83c7eb 36%,#287cb5 75%,#145382);
    border-color: #5fb4ef;
    box-shadow: 0 0 15px #71ceff70,0 5px 9px #0006;
    transform: translateY(-3px);
}

.device-readout {
    display: flex;
    flex-direction: column;
    gap: 7px;
    min-width: 130px;
}

.device-readout small {
    font-size: 10px;
    letter-spacing: .7px;
    color: #9eb5c4;
}

.device-readout strong {
    font-size: 48px;
    font-weight: 650;
    line-height: 1.1;
}

.device-readout span {
    font-size: 12px;
    color: #b8cddd;
}

.device-footer {
    border-top: 1px solid #ffffff25;
    padding-top: 13px;
}

.tiny-led {
    display: inline-block;
    background: #38d8a4;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    margin-right: 5px;
}

.bench-controls h3 {
    font-size: 16px;
    margin: 3px 0 7px;
}

.bench-controls>p {
    font-size: 13px;
    line-height: 1.55;
    color: var(--muted);
    margin: 0 0 15px;
}

.control-pair {
    display: flex;
    gap: 8px;
    margin-bottom: 9px;
}

.control-pair .btn {
    flex: 1;
}

.bench-controls .status-text {
    margin: 10px 0 0;
}

.info-copy {
    margin: 18px;
    color: var(--muted);
    line-height: 1.7;
}

.alphabet-grid {
    padding: 0 18px 22px;
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(70px,1fr));
    gap: 12px;
}

.alphabet-grid .cell-unit {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 12px 5px;
    background: #f9fbfd;
}

.about-panel {
    padding: 22px;
    line-height: 1.75;
}

.about-panel h2 {
    font-size: 18px;
    margin-top: 0;
}

.about-panel p {
    color: var(--muted);
}

@media(max-width:740px) {
    .site-shell {
        margin: 0;
        min-height: 100vh;
        border-radius: 0;
    }
    .topbar {
        padding: 0 14px;
        height: 70px;
    }
    .logo {
        font-size: 16px;
    }
    .logo-icon {
        width: 27px;
        height: 27px;
    }
    .topbar nav {
        gap: 12px;
        margin-right: 12px;
    }
    .nav-link {
        font-size: 12px;
        padding-top: 25px;
    }
    .avatar {
        width: 28px;
        height: 28px;
    }
    main {
        padding: 14px;
    }
    .content-grid, .bench-content {
        grid-template-columns: 1fr;
    }
    .heading-box {
        padding: 20px 12px;
    }
    .bench-content {
        gap: 12px;
    }
    .result-panel textarea {
        min-height: 170px;
    }
    .dropzone {
        height: 195px;
    }
}

@media(max-width:380px) {
    .logo {
        font-size: 14px;
        gap: 5px;
    }
    .nav-link {
        font-size: 11px;
    }
    .topbar nav {
        gap: 7px;
    }
    .device-main {
        gap: 18px;
    }
    .bench-dots {
        gap: 10px;
        grid-template-rows: repeat(3,37px);
    }
    .bench-dots .pin {
        width: 32px;
        height: 32px;
    }
    .button-row .btn {
        flex: 1;
    }
    .control-pair {
        flex-wrap: wrap;
    }
}