@font-face {
    font-family: 'PixelFontZHHans';
    src: url('fusion-pixel-font-12px-monospaced-ttf/fusion-pixel-12px-monospaced-zh_hans.ttf') format('truetype');
}

@font-face {
    font-family: 'PixelFontZHHant';
    src: url('fusion-pixel-font-12px-monospaced-ttf/fusion-pixel-12px-monospaced-zh_hant.ttf') format('truetype');
}

@font-face {
    font-family: 'PixelFontLatin';
    src: url('fusion-pixel-font-12px-monospaced-ttf/fusion-pixel-12px-monospaced-latin.ttf') format('truetype');
}

@font-face {
    font-family: 'PixelFontJA';
    src: url('fusion-pixel-font-12px-monospaced-ttf/fusion-pixel-12px-monospaced-ja.ttf') format('truetype');
}

@font-face {
    font-family: 'PixelFontKO';
    src: url('fusion-pixel-font-12px-monospaced-ttf/fusion-pixel-12px-monospaced-ko.ttf') format('truetype');
}

body {
    font-family: sans-serif;
    background: #f4f4f5;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 40px 20px;
    margin: 0;
    box-sizing: border-box;
    min-height: 100vh;
}

.card {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 550px;
    box-sizing: border-box;
}

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    border-bottom: 2px solid #eee;
    padding-bottom: 12px;
}

h2 {
    margin-top: 0;
    margin-bottom: 0;
    color: #333;
    font-size: 20px;
    line-height: 1.35;
}

.language-toggle {
    flex: 0 0 auto;
    min-width: 44px;
    height: 36px;
    padding: 0 12px;
    border: 1px solid #d4d4d8;
    border-radius: 6px;
    background: #fff;
    color: #111827;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}

.language-toggle:hover {
    background: #f4f4f5;
    border-color: #a1a1aa;
}

.form-group {
    margin-top: 18px;
    margin-bottom: 0;
}

.input-action-row {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.input-action-row input {
    flex: 4 1 0;
    min-width: 0;
}

.btn-scan {
    background: #10b981;
    color: white;
    white-space: nowrap;
    flex: 1 1 0;
    padding-left: 16px;
    padding-right: 16px;
    text-align: center;
}

.btn-scan:hover:not(:disabled) {
    background: #059669;
}

.hidden-file-input {
    display: none;
}

.advanced-options {
    margin-top: 18px;
    padding: 16px;
    border: 1px solid #ececec;
    border-radius: 8px;
    background: #fafafa;
}

.advanced-options summary {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    font-weight: bold;
    color: #333;
    margin: 0;
    list-style: none;
    padding: 10px 12px;
    border-radius: 8px;
    background: linear-gradient(180deg, #ffffff, #fbfbfb);
    border: 1px solid #ececec;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.advanced-options summary::after {
    content: '▾';
    font-size: 14px;
    line-height: 1;
    transition: transform 0.2s ease;
}

.advanced-options[open] summary::after {
    transform: rotate(180deg);
}

.advanced-options summary::-webkit-details-marker {
    display: none;
}

.advanced-options .form-group:last-child {
    margin-bottom: 0;
}

/* animated content area */
.advanced-options .advanced-content {
    overflow: hidden;
    transition: max-height 260ms ease, padding 200ms ease;
    max-height: 0;
    padding: 0 12px;
}

.advanced-options[open] .advanced-content {
    max-height: 400px;
    padding: 12px;
}

.advanced-options summary:focus {
    outline: 2px solid rgba(0, 0, 0, 0.08);
}

label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    color: #555;
    font-weight: bold;
}

.font-notice {
    font-weight: normal;
    font-size: 11px;
    color: #888;
    margin-left: 6px;
}

.font-notice a {
    color: #666;
    text-decoration: underline;
}

input,
select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-sizing: border-box;
    font-family: monospace;
    font-size: 14px;
}

input:focus,
select:focus {
    outline: none;
    border-color: #000;
}

.preview-container {
    margin-top: 24px;
    text-align: center;
}

canvas {
    border: 1px solid #ccc;
    -webkit-font-smoothing: none;
    font-smooth: never;
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    width: 100%;
    max-width: 500px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.btn-group {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    width: 100%;
}

.btn {
    flex: 1;
    padding: 14px;
    border: none;
    border-radius: 6px;
    font-weight: bold;
    font-size: 15px;
    cursor: pointer;
    transition: 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-generate {
    background: #111;
    color: white;
    width: 100%;
    margin-top: 24px;
}

.btn-generate:hover {
    background: #333;
}

.btn-download {
    background: #e74c3c;
    color: white;
}

.btn-download:hover:not(:disabled) {
    background: #c0392b;
}

.btn-ble {
    background: #2563eb;
    color: white;
}

.btn-ble:hover:not(:disabled) {
    background: #1d4ed8;
}

.status-bar {
    margin-top: 16px;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: #fafafa;
    font-size: 13px;
    color: #444;
}

.feedback-panel {
    margin-top: 12px;
    border: 1px solid #1f2937;
    border-radius: 6px;
    background: #0b1220;
    overflow: hidden;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

.feedback-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-bottom: 1px solid #1f2937;
    background: linear-gradient(180deg, #111827, #0f172a);
    font-size: 13px;
    font-weight: 700;
    color: #93c5fd;
    letter-spacing: 0.2px;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

.feedback-header button {
    border: 1px solid #334155;
    background: #0f172a;
    color: #cbd5e1;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

.feedback-header button:hover {
    background: #1e293b;
}

#log {
    min-height: 120px;
    max-height: 280px;
    padding: 8px 10px;
    overflow-y: auto;
    overflow-x: hidden;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    font-size: 12px;
    line-height: 1.5;
    color: #e2e8f0;
    background: #020617;
    box-sizing: border-box;
    word-break: break-word;
}

#log .log-entry {
    display: grid;
    grid-template-columns: auto auto auto 1fr;
    align-items: start;
    column-gap: 8px;
    padding: 2px 0;
}

#log .time,
#log .level,
#log .scope {
    white-space: nowrap;
}

#log .time {
    color: #64748b;
}

#log .level {
    font-weight: 700;
}

#log .scope {
    color: #a5b4fc;
}

#log .msg {
    color: #e2e8f0;
}

#log .level-info {
    color: #60a5fa;
}

#log .level-ok {
    color: #22c55e;
}

#log .level-warn {
    color: #f59e0b;
}

#log .level-error {
    color: #ef4444;
}

#log .level-tx,
#log .level-rx {
    color: #38bdf8;
}

#log::-webkit-scrollbar {
    width: 8px;
}

#log::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 6px;
}

#log::-webkit-scrollbar-track {
    background: #020617;
}

.intro {
    background: #f0f0f0;
    padding: 14px;
    border-radius: 6px;
    margin-bottom: 24px;
    font-size: 13px;
    line-height: 1.6;
    color: #555;
}

.intro p {
    margin: 0 0 8px 0;
}

.intro p:last-child {
    margin-bottom: 0;
}

@media (max-width: 480px) {
    body {
        padding: 15px 10px;
    }

    .card {
        padding: 20px;
        border-radius: 8px;
    }

    h2 {
        font-size: 18px;
    }

    .card-header {
        align-items: center;
    }

    .intro {
        font-size: 12px;
        padding: 12px;
    }

    input,
    select {
        padding: 10px;
        font-size: 14px;
    }

    .btn {
        padding: 12px;
        font-size: 14px;
    }
}