:root {
    --accent: var(--app-accent);
    --accent-strong: var(--app-accent-strong);
    --text-main: var(--app-text);
    --text-sub: var(--app-muted);
    --line-soft: var(--app-line);
    --card-bg: var(--app-card);
}

#main_bg {
    background-image: url(../assets/images/background/miku_vivid.webp);
    background-size: cover;
    background-position: center;
    position: fixed;
    min-height: 100vh;
    width: 100%;
    z-index: -1;
}

#panel {
    font-family: var(--app-font-serif);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    background: linear-gradient(135deg, var(--app-glass), rgba(245,252,249,0.62));
    border: 1px solid rgba(255,255,255,0.45);
}

.cs-head h1 {
    font-size: 22px;
    color: var(--text-main);
    margin-bottom: 6px;
}

.cs-head p {
    font-size: 13px;
    color: var(--text-sub);
    margin-bottom: 16px;
}

.cs-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    align-items: start;
}

@media (max-width: 1100px) {
    .cs-layout { grid-template-columns: 1fr; }
}

.cs-col {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cs-section {
    background: var(--card-bg);
    border: 1px solid var(--line-soft);
    border-radius: 12px;
    padding: 16px;
    backdrop-filter: blur(6px);
}

.cs-section h2 {
    font-size: 15px;
    color: var(--text-main);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--line-soft);
}

/* Manual color converter */
.cs-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.cs-row label {
    font-size: 13px;
    color: var(--text-main);
    min-width: 60px;
}

.cs-row input[type="number"],
.cs-row input[type="text"],
.cs-row select {
    padding: 6px 10px;
    border: 1px solid var(--line-soft);
    border-radius: 7px;
    font-size: 13px;
    background: var(--app-surface-input);
    width: 80px;
    box-sizing: border-box;
    font-family: var(--app-font-serif);
}

.cs-row select { width: auto; min-width: 120px; }

.cs-color-preview {
    width: 48px;
    height: 32px;
    border-radius: 6px;
    border: 1px solid #ccc;
    flex-shrink: 0;
}

.cs-result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 10px;
}

.cs-result-item {
    background: var(--app-card);
    border: 1px solid var(--line-soft);
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 12px;
}

.cs-result-item .label {
    color: var(--text-sub);
    margin-bottom: 3px;
}

.cs-result-item .value {
    color: var(--text-main);
    font-weight: 600;
    font-family: "Consolas", monospace;
}

/* Curve visualizer */
.cs-curve-wrap {
    position: relative;
    background: #0f172a;
    border-radius: 10px;
    padding: 12px;
    margin-top: 12px;
}

.cs-curve-wrap canvas {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 6px;
}

.cs-curve-legend {
    display: flex;
    gap: 12px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.cs-curve-legend span {
    font-size: 11px;
    color: var(--app-text-inverse-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.cs-curve-legend .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

/* Image converter */
.cs-drop-zone {
    border: 1px dashed var(--app-line-strong);
    border-radius: 10px;
    padding: 28px 16px;
    text-align: center;
    background: linear-gradient(160deg, var(--app-glass-strong), rgba(234,248,242,0.72));
    cursor: pointer;
    transition: all 0.24s ease;
    margin-bottom: 12px;
    display: block;
}

.cs-drop-zone:hover {
    background: linear-gradient(160deg, var(--app-surface-input), rgba(227,246,239,0.78));
    border-color: var(--app-accent);
}

.cs-drop-zone p { font-size: 14px; color: var(--app-text); }
.cs-drop-zone small { font-size: 12px; color: var(--text-sub); }

.cs-img-preview-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 12px;
}

.cs-img-card {
    background: #0f172a;
    border-radius: 10px;
    padding: 8px;
    text-align: center;
}

.cs-img-card canvas {
    width: 100%;
    height: auto;
    border-radius: 6px;
    display: block;
}

.cs-img-card .tag {
    font-size: 11px;
    color: var(--app-text-inverse-muted);
    margin-top: 5px;
    display: block;
}

.cs-img-opts {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.cs-img-opts label {
    font-size: 13px;
    color: var(--text-main);
}

.cs-img-opts select {
    padding: 6px 10px;
    border: 1px solid var(--line-soft);
    border-radius: 7px;
    font-size: 13px;
    background: var(--app-surface-input);
    font-family: var(--app-font-serif);
}

.cs-btn {
    padding: 9px 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-family: var(--app-font-serif);
    transition: all 0.2s;
    box-shadow: var(--app-shadow-subtle);
}

.cs-btn:hover {
    background: linear-gradient(135deg, var(--app-accent-light), var(--app-accent-strong));
    transform: translateY(-1px);
    box-shadow: var(--app-shadow-subtle);
}

.cs-btn:disabled {
    background: rgba(150,150,150,0.6);
    cursor: not-allowed;
    transform: none;
}

.cs-btn-secondary {
    padding: 8px 16px;
    background: rgba(104,120,130,0.8);
    color: white;
    border: none;
    border-radius: 7px;
    cursor: pointer;
    font-size: 13px;
    font-family: var(--app-font-serif);
    transition: all 0.2s;
}

.cs-btn-secondary:hover {
    background: rgba(82,98,109,0.92);
}

/* Gamma slider */
.cs-gamma-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 8px 0;
}

.cs-gamma-row input[type="range"] {
    flex: 1;
    cursor: pointer;
}

.cs-gamma-row .gamma-val {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
    min-width: 40px;
    text-align: right;
    font-family: "Consolas", monospace;
}

.cs-info-box {
    background: var(--app-overlay-dark);
    color: var(--app-text-inverse);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 12px;
    font-family: "Consolas", monospace;
    line-height: 1.7;
    margin-top: 10px;
}