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

:root {
    --bg: #0b0d14; --surface: #12151f; --card: #181c28; --border: #252a3a;
    --text: #c8cde0; --text-dim: #5a6080; --text-bright: #eef0f8;
    --accent: #6e8efb; --positive: #34d399; --negative: #f87171;
    --mono: 'JetBrains Mono', monospace; --sans: 'Inter', -apple-system, sans-serif;
}

body { background: var(--bg); color: var(--text); font-family: var(--sans); min-height: 100vh; }
.app { max-width: 900px; margin: 0 auto; padding: 40px 20px; }

.header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 28px; flex-wrap: wrap; gap: 12px; }
h1 { font-size: 1.8rem; font-weight: 700; color: var(--text-bright); letter-spacing: -0.5px; }
.subtitle { color: var(--text-dim); font-size: 0.85rem; margin-top: 4px; }
.model-badge { font-family: var(--mono); font-size: 0.7rem; background: var(--card); border: 1px solid var(--border); padding: 6px 12px; border-radius: 6px; color: var(--text-dim); }

/* Side-by-side grid */
.main-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 28px; }

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

.upload-zone {
    border: 2px dashed var(--border); border-radius: 14px;
    padding: 24px; text-align: center; cursor: pointer;
    transition: all 0.3s; flex: 1;
    display: flex; align-items: center; justify-content: center;
    min-height: 260px;
}
.upload-zone:hover { border-color: var(--accent); background: rgba(110, 142, 251, 0.03); }
.upload-zone.has-image { padding: 8px; }
.upload-icon { font-size: 2.5rem; color: var(--text-dim); margin-bottom: 8px; font-weight: 300; }
.upload-hint { font-size: 0.75rem; color: var(--text-dim); margin-top: 4px; }
.preview-img { max-width: 100%; max-height: 350px; border-radius: 10px; object-fit: contain; }
.preview-img.hidden { display: none; }
.hidden { display: none !important; }

.image-meta {
    margin-top: 8px; padding: 8px 12px; background: var(--surface);
    border: 1px solid var(--border); border-radius: 8px;
    font-family: var(--mono); font-size: 0.72rem; color: var(--text-dim);
    text-align: center;
}

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

.section-label { font-size: 0.8rem; font-weight: 500; color: var(--text-dim); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.5px; }

/* Mode tabs */
.mode-section { margin-bottom: 14px; }

.mode-tabs { display: flex; gap: 8px; }

.mode-btn {
    flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
    padding: 12px 8px; background: var(--surface); border: 1px solid var(--border);
    border-radius: 10px; cursor: pointer; transition: all 0.2s;
}
.mode-btn:hover { border-color: var(--accent); }
.mode-btn.active { border-color: var(--accent); background: rgba(110, 142, 251, 0.1); }
.mode-icon { font-size: 1.3rem; }
.mode-name { font-size: 0.82rem; font-weight: 600; color: var(--text-bright); font-family: var(--sans); }
.mode-desc { font-size: 0.68rem; color: var(--text-dim); font-family: var(--sans); }

.btn-primary {
    width: 100%; padding: 13px; background: var(--accent); border: none; border-radius: 10px;
    color: #fff; font-family: var(--sans); font-size: 0.9rem; font-weight: 600;
    cursor: pointer; transition: all 0.2s; margin-bottom: 14px;
}
.btn-primary:hover { background: #5a7af0; transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

.result-area {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 12px; padding: 16px; animation: fadeIn 0.3s; flex: 1;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; } }

.result-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }

.mode-tag {
    font-size: 0.75rem; font-weight: 600; color: var(--accent);
    background: rgba(110, 142, 251, 0.1); padding: 4px 10px; border-radius: 6px;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.time-tag { font-family: var(--mono); font-size: 0.75rem; color: var(--text-dim); }

.caption-list { display: flex; flex-direction: column; gap: 8px; }

.caption-item {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 12px; background: var(--card); border-radius: 8px;
    font-size: 0.88rem; color: var(--text-bright); line-height: 1.5;
    animation: fadeIn 0.3s;
}
.caption-item.best { border-left: 3px solid var(--accent); }
.caption-num { font-family: var(--mono); font-weight: 700; color: var(--accent); min-width: 20px; }
.caption-badge { font-size: 0.65rem; background: var(--accent); color: #fff; padding: 2px 6px; border-radius: 4px; margin-left: 8px; font-weight: 600; }

/* Demo Gallery */
.gallery-section { padding-top: 20px; border-top: 1px solid var(--border); margin-bottom: 20px; }

.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }

.gallery-item {
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    padding: 16px 8px; background: var(--surface); border: 1px solid var(--border);
    border-radius: 10px; cursor: pointer; transition: all 0.2s;
}
.gallery-item:hover { border-color: var(--accent); transform: translateY(-2px); }
.gallery-placeholder { font-size: 2rem; }
.gallery-item span { font-size: 0.75rem; color: var(--text-dim); }

footer { margin-top: 48px; text-align: center; color: var(--text-dim); font-size: 0.75rem; }
footer a { color: var(--accent); text-decoration: none; }

@media (max-width: 700px) {
    .main-grid { grid-template-columns: 1fr; }
    .gallery { grid-template-columns: repeat(2, 1fr); }
    .header { flex-direction: column; }
}