:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --border-color: #30363d;
    --text-primary: #c9d1d9;
    --text-muted: #8b949e;
    --accent: #238636;
    --accent-hover: #2ea043;
    --brand-blue: #1f6feb;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
body { background-color: var(--bg-color); color: var(--text-primary); min-height: 100vh; display: flex; flex-direction: column; }
.container { max-width: 900px; margin: 0 auto; padding: 0 20px; width: 100%; }

.navbar { background-color: var(--card-bg); border-bottom: 1px solid var(--border-color); padding: 15px 0; }
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.25rem; font-weight: 700; color: #fff; letter-spacing: 1px; }
.logo span { color: var(--brand-blue); }
.nav-links { display: flex; gap: 10px; }
.tab-btn { background: transparent; border: 1px solid var(--border-color); color: var(--text-muted); padding: 8px 16px; border-radius: 6px; cursor: pointer; transition: all 0.2s; font-size: 0.9rem; }
.tab-btn.active, .tab-btn:hover { background: var(--border-color); color: #fff; }

.main-content { margin-top: 40px; flex: 1; }
.tool-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 8px; padding: 30px; }
.tool-card h2 { color: #fff; margin-bottom: 8px; font-size: 1.4rem; }
.tool-card .desc { color: var(--text-muted); margin-bottom: 25px; font-size: 0.95rem; }

.drop-zone { border: 2px dashed var(--border-color); border-radius: 6px; padding: 40px 20px; text-align: center; cursor: pointer; transition: border-color 0.2s; background: rgba(255,255,255,0.01); }
.drop-zone:hover { border-color: var(--brand-blue); }
.browse-link { color: var(--brand-blue); text-decoration: underline; }

.controls-panel { margin-top: 25px; display: flex; flex-direction: column; gap: 18px; }
.info-row { display: flex; justify-content: space-between; font-size: 0.9rem; color: var(--text-muted); padding-bottom: 10px; border-bottom: 1px solid var(--border-color); }

.range-group, .select-group { display: flex; flex-direction: column; gap: 8px; font-size: 0.9rem; }
input[type="range"], select { width: 100%; padding: 8px; background: var(--bg-color); border: 1px solid var(--border-color); border-radius: 6px; color: #fff; }

.action-btn { background-color: var(--accent); color: #fff; border: none; padding: 12px; border-radius: 6px; font-weight: 600; cursor: pointer; transition: background-color 0.2s; font-size: 1rem; }
.action-btn:hover { background-color: var(--accent-hover); }

.progress-bar { width: 100%; height: 8px; background: var(--border-color); border-radius: 4px; overflow: hidden; }
.progress-fill { width: 0%; height: 100%; background: var(--brand-blue); transition: width 0.2s; }

.status-box { padding: 10px; background: var(--bg-color); border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.85rem; color: var(--text-muted); }
.result-text { width: 100%; height: 250px; background: var(--bg-color); border: 1px solid var(--border-color); border-radius: 6px; color: #fff; padding: 12px; font-family: monospace; font-size: 0.9rem; resize: vertical; }

.hidden { display: none !important; }