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

:root {
    --bg: #fffdf7;
    --text: #0f172a;
    --muted: #475569;
    --border: #0f172a;
    --panel: #dff4ff;
    --panel-2: #ffffff;
    --accent: #00a6fb;
    --accent-strong: #0077b6;
    --highlight: #ffd23f;
    --danger: #ff5d73;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 920px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 3px solid var(--border);
    padding-bottom: 20px;
}

h1,
h2,
h3,
button,
summary,
.back-button {
    font-family: "Arial Black", Arial, Helvetica, sans-serif;
    font-weight: 900;
    letter-spacing: 0.02em;
}

h1 {
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    margin-bottom: 10px;
    line-height: 1;
    text-transform: uppercase;
}

h2 {
    font-size: 1.8rem;
    margin: 0 0 16px;
}

h3 {
    font-size: 1.35rem;
    margin: 0 0 14px;
}

p,
ul {
    margin-bottom: 16px;
}

.subtitle {
    color: var(--accent-strong);
    font-size: 1rem;
}

.back-button {
    display: inline-block;
    margin-bottom: 20px;
    padding: 10px 15px;
    background: var(--highlight);
    color: var(--text);
    text-decoration: none;
    border: 3px solid var(--border);
}

.back-button:hover,
.action-button:hover {
    background: var(--text);
    color: #fff;
}

.info-box {
    background: var(--highlight);
    border: 3px solid var(--border);
    padding: 16px;
    margin: 20px 0;
}

.canvas-container {
    background: var(--panel);
    border: 3px solid var(--border);
    padding: 20px;
    margin: 30px 0;
}

.canvas-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.canvas-toolbar p {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
    text-transform: uppercase;
}

.action-button {
    padding: 10px 14px;
    background: var(--danger);
    color: white;
    border: 3px solid var(--border);
    cursor: pointer;
    font: inherit;
}

.canvas-shell {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 520px;
    overflow: auto;
    background: var(--panel-2);
    border: 3px solid var(--border);
    padding: 12px;
}

#canvas {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
    background: #000;
    outline: none;
    image-rendering: pixelated;
}

.canvas-options {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 15px;
    font-size: 0.95rem;
    color: var(--muted);
}

.canvas-options label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.canvas-options input {
    accent-color: var(--accent-strong);
}

.status {
    margin-top: 15px;
    min-height: 24px;
    color: var(--accent-strong);
    font-weight: 700;
}

progress {
    width: 100%;
    height: 18px;
    margin-top: 10px;
    border: 3px solid var(--border);
}

progress[hidden] {
    display: none;
}

details {
    margin-top: 15px;
}

summary {
    cursor: pointer;
}

.feature-list {
    padding-left: 24px;
}

.feature-list li {
    margin-bottom: 10px;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

textarea {
    width: 100%;
    min-height: 120px;
    margin-top: 10px;
    padding: 10px;
    border: 3px solid var(--border);
    font-family: "Courier New", monospace;
    font-size: 0.9rem;
    resize: vertical;
    background: white;
    color: var(--text);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 3px solid var(--border);
    font-size: 0.9rem;
    color: var(--muted);
}

@media (max-width: 768px) {
    body {
        padding: 16px;
        font-size: 16px;
    }

    h1 {
        font-size: 2.2rem;
    }

    .canvas-container {
        padding: 15px;
    }

    .canvas-shell {
        min-height: 360px;
    }
}