:root {
    --bg: #0f1115;
    --bg-card: #1a1d24;
    --border: #2a2e37;
    --text: #e6e8eb;
    --text-dim: #9aa0ab;
    --accent: #5b8def;
    --accent-hover: #7ca3f2;
    --error: #e5675a;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.topbar {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    color: var(--text);
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
}

.content {
    flex: 1;
    max-width: 780px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

h1 { font-size: 1.5rem; margin-bottom: 1.5rem; }
h2 { font-size: 1.1rem; margin-top: 0; }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem;
    text-decoration: none;
    color: var(--text);
    transition: border-color .15s, transform .15s;
}

.card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.card-icon { font-size: 1.8rem; margin-bottom: .5rem; }
.card-name { font-weight: 600; margin-bottom: .25rem; }
.card-desc { font-size: .85rem; color: var(--text-dim); }

.back {
    display: inline-block;
    margin-bottom: 1rem;
    color: var(--text-dim);
    text-decoration: none;
    font-size: .9rem;
}
.back:hover { color: var(--accent); }

.tool-form {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: .5rem;
}

.tool-form label {
    font-size: .85rem;
    color: var(--text-dim);
    margin-top: .5rem;
}

.tool-form input[type="file"],
.tool-form select {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: .6rem;
    border-radius: 6px;
}

.tool-form input[type="range"] { width: 100%; }

.tool-form button {
    margin-top: 1rem;
    background: var(--accent);
    color: white;
    border: none;
    padding: .75rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
}
.tool-form button:hover { background: var(--accent-hover); }

.error {
    background: rgba(229, 103, 90, .15);
    border: 1px solid var(--error);
    color: var(--error);
    padding: .75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.success {
    background: rgba(91, 141, 239, .12);
    border: 1px solid var(--accent);
    color: var(--text);
    padding: .75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.empty { color: var(--text-dim); }

.hint {
    color: var(--text-dim);
    font-size: .85rem;
    margin-top: 1rem;
}

.btn {
    display: inline-block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    text-decoration: none;
    padding: .6rem 1rem;
    border-radius: 8px;
    font-size: .9rem;
    margin-bottom: 1.5rem;
    cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent-hover); }

.sysload {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    font-size: .8rem;
    color: var(--text-dim);
}

.footer {
    text-align: center;
    padding: 1rem;
    font-size: .75rem;
    color: var(--text-dim);
    border-top: 1px solid var(--border);
}

.upload-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .75);
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.upload-overlay.active { display: flex; }
.upload-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem 2rem;
    text-align: center;
    min-width: 260px;
}
.upload-title { margin-bottom: 1rem; font-weight: 600; color: var(--text); }
.upload-progress-track {
    background: var(--border);
    border-radius: 6px;
    height: 10px;
    overflow: hidden;
}
.upload-progress-bar {
    background: var(--accent);
    height: 100%;
    width: 0%;
    transition: width .15s;
}
.upload-progress-text { margin-top: .5rem; font-size: .85rem; color: var(--text-dim); }