:root {
    --bg: #000000;
    --ui-surface: #0a0a0a;
    --ui-border: #1a1a1a;
    --text: #ffffff;
    --radius: 8px;
}

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

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.app-header { padding: 25px 0; text-align: center; border-bottom: 1px solid var(--ui-border); }
.symbol { font-size: 1.8rem; opacity: 0.7; }

.app-container {
    width: 100%; max-width: 1100px; margin: 0 auto;
    padding: 30px 20px; display: grid;
    grid-template-columns: 1fr 400px; gap: 30px; flex-grow: 1;
}

@media (max-width: 900px) {
    .app-container { grid-template-columns: 1fr; }
}

/* Sections */
.section-group {
    background: #0d0d0d;
    border: 1px solid var(--ui-border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}
.section-title {
    font-size: 0.75rem;
    color: #444;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--ui-border);
    padding-bottom: 10px;
}

.stage {
    background: var(--ui-surface); border: 1px solid var(--ui-border);
    border-radius: var(--radius); display: flex; align-items: center;
    justify-content: center; padding: 20px; height: fit-content;
}
.canvas-wrapper { width: 100%; max-width: 500px; box-shadow: 0 20px 40px rgba(0,0,0,0.5); }
canvas { width: 100%; height: auto; display: block; }

.tabs { display: flex; gap: 15px; margin-bottom: 20px; }
.tab-trigger {
    background: none; border: none; color: #555; padding: 10px 0;
    font-size: 0.8rem; font-weight: 600; cursor: pointer;
}
.tab-trigger.active { color: #fff; border-bottom: 2px solid #fff; }
.tab-content { display: none; }
.tab-content.active { display: block; }

.field { margin-bottom: 15px; }
.field label { display: block; font-size: 0.65rem; color: #777; text-transform: uppercase; margin-bottom: 6px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

input, select {
    width: 100%; background: #050505; border: 1px solid var(--ui-border);
    color: #fff; padding: 10px; font-size: 0.85rem; border-radius: 4px; outline: none;
}
input:disabled, .disabled-group { opacity: 0.3; pointer-events: none; }
input[type="range"] { padding: 0; cursor: pointer; }

.checkbox-field { display: flex; align-items: center; gap: 10px; margin-bottom: 15px; }
.checkbox-field label { margin-bottom: 0; cursor: pointer; color: #fff; font-size: 0.8rem; }
.checkbox-field input { width: auto; cursor: pointer; }

.action-btn {
    width: 100%; background: #fff; color: #000; border: none; padding: 15px;
    border-radius: 6px; font-weight: 700; cursor: pointer; margin-top: 10px; text-transform: uppercase;
}

.footer { padding: 30px; text-align: center; font-size: 0.75rem; color: #333; }
.footer a { color: #555; text-decoration: none; }
.footer .heart { color: #800; }