:root {
    --navy: #0D1B2A;
    --navy-deep: #081320;
    --navy-soft: #162A3F;
    --electric: #2589E8;
    --electric-dim: #1A6BC2;
    --orange: #E87525;
    --orange-soft: #FFA961;
    --ink: #E8EEF5;
    --muted: #8FA3B8;
    --line: #1E3550;
    --ok: #3DD17F;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(ellipse at top right, rgba(37, 137, 232, 0.12), transparent 60%),
        radial-gradient(ellipse at bottom left, rgba(232, 117, 37, 0.08), transparent 50%),
        var(--navy);
    background-attachment: fixed;
}

body { display: flex; flex-direction: column; }

main {
    flex: 1;
    width: 100%;
    max-width: 880px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.site-header {
    padding: 2rem 1.5rem 0.5rem;
    max-width: 880px;
    margin: 0 auto;
}

.wordmark {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: 0.04em;
}
.wordmark .accent { color: var(--orange); }

.subtitle {
    margin-top: 0.35rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--muted);
}

.upload-card, .result-card {
    background: linear-gradient(180deg, var(--navy-soft), var(--navy-deep));
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 2.25rem 2rem;
    box-shadow: 0 24px 60px -24px rgba(0,0,0,0.6);
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-weight: 500;
    font-size: 1.4rem;
    margin: 0 0 0.5rem;
    letter-spacing: 0.03em;
}

.lede {
    color: var(--muted);
    margin: 0 0 1.75rem;
    line-height: 1.55;
    font-size: 0.95rem;
}




/* --- File input (native hidden, custom label visible) --- */
.file-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 1rem;
    border: 2px dashed var(--line);
    border-radius: 10px;
    background: rgba(37, 137, 232, 0.04);
    transition: border-color 0.15s, background 0.15s;
}

/* Hide native input but keep it accessible to screen readers and keyboard */
#fileInput {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Visual focus ring when the hidden input gets keyboard focus */
#fileInput:focus + .file-btn {
    outline: 2px solid var(--electric);
    outline-offset: 2px;
}

.file-btn {
    display: inline-block;
    padding: 0.65rem 1.2rem;
    background: var(--electric);
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background 0.15s, transform 0.1s;
    white-space: nowrap;
    user-select: none;
}
.file-btn:hover {
    background: var(--electric-dim);
    transform: translateY(-1px);
}
.file-btn:active {
    transform: translateY(0);
}

.file-name {
    color: var(--muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    word-break: break-all;
    flex: 1;
    min-width: 0;
}
.file-name.selected { color: var(--ok); }

.file-hint {
    margin: 0.6rem 0 0;
    color: var(--muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    padding-left: 0.25rem;
}

/* --- Advanced params --- */
.advanced {
    margin-top: 1.5rem;
    border-top: 1px solid var(--line);
    padding-top: 1.25rem;
}
.advanced summary {
    cursor: pointer;
    color: var(--muted);
    font-size: 0.9rem;
    user-select: none;
    padding: 0.3rem 0;
}
.advanced summary:hover { color: var(--electric); }

.param-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}
.param-grid label { display: flex; flex-direction: column; gap: 0.35rem; }
.param-grid label > span { font-size: 0.85rem; }
.param-grid code {
    font-family: 'JetBrains Mono', monospace;
    color: var(--orange);
    font-size: 0.82rem;
}
.param-grid input {
    background: var(--navy-deep);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0.55rem 0.7rem;
    color: var(--ink);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
}
.param-grid input:focus {
    outline: none;
    border-color: var(--electric);
}
.param-grid small {
    color: var(--muted);
    font-size: 0.72rem;
    line-height: 1.3;
}

/* --- Run button --- */
.run-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    margin-top: 1.75rem;
    padding: 0.85rem 1.5rem;
    background: var(--orange);
    color: var(--navy-deep);
    border: none;
    border-radius: 8px;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 700;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.1s, background 0.15s;
}
.run-btn:hover { background: var(--orange-soft); transform: translateY(-1px); }
.run-btn:disabled { opacity: 0.6; cursor: wait; }
.run-btn.secondary {
    background: transparent;
    color: var(--electric);
    border: 1px solid var(--electric);
}
.run-btn.secondary:hover { background: rgba(37, 137, 232, 0.1); }
.run-btn .arrow { font-size: 1.1em; line-height: 1; }

.note {
    color: var(--muted);
    font-size: 0.8rem;
    margin: 1rem 0 0;
    font-family: 'JetBrains Mono', monospace;
}

/* --- Result page --- */
.compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin: 1.5rem 0;
}
.compare figure { margin: 0; display: flex; flex-direction: column; }
.compare img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: var(--navy-deep);
    image-rendering: pixelated;
}
.compare figcaption {
    margin-top: 0.6rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--muted);
    text-align: center;
}

.actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.job-id {
    margin-top: 1.5rem;
    font-size: 0.75rem;
    color: var(--muted);
    font-family: 'JetBrains Mono', monospace;
}
.job-id code { color: var(--electric); }

.flash-container { margin-bottom: 1.25rem; }
.flash {
    padding: 0.8rem 1rem;
    background: rgba(232, 117, 37, 0.1);
    border: 1px solid var(--orange);
    border-radius: 8px;
    color: var(--orange-soft);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.site-footer {
    padding: 1.5rem;
    text-align: center;
    color: var(--muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    border-top: 1px solid var(--line);
}

@media (max-width: 600px) {
    .compare { grid-template-columns: 1fr; }
    .upload-card, .result-card { padding: 1.5rem 1.25rem; }
    .wordmark { font-size: 1.6rem; }
}