:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #06b6d4;
    --accent-hover: #0891b2;
    --accent2: #d946ef;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border: #475569;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.ci-container { max-width: 1600px; margin: 0 auto; padding: 16px; }

header {
    text-align: center; padding: 16px 0;
    border-bottom: 2px solid var(--border); margin-bottom: 16px;
}
header h1 {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    margin-bottom: 6px;
}
.subtitle { color: var(--text-secondary); font-size: 1rem; }

.main-layout { display: grid; grid-template-columns: 280px 1fr; gap: 16px; }

.controls-panel {
    background: var(--bg-secondary); border-radius: 10px; padding: 16px;
    height: fit-content; position: sticky; top: 16px; overflow-y: auto; max-height: calc(100vh - 32px);
}
.control-section { margin-bottom: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.control-section:last-child { border-bottom: none; margin-bottom: 0; }
.control-section h3 { font-size: 0.95rem; margin-bottom: 10px; color: var(--accent); }
.control-group { margin-bottom: 12px; }
.control-group label {
    display: flex; justify-content: space-between; align-items: center;
    font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 4px;
}
.val {
    background: var(--bg-tertiary); padding: 1px 6px; border-radius: 3px;
    font-family: 'Courier New', monospace; font-size: 0.8rem; color: var(--accent);
}
input[type="range"] {
    width: 100%; height: 5px; background: var(--bg-tertiary); border-radius: 3px;
    -webkit-appearance: none; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; width: 16px; height: 16px; background: var(--accent); border-radius: 50%; cursor: pointer;
}
select {
    width: 100%; padding: 6px 10px; background: var(--bg-tertiary); color: var(--text-primary);
    border: 1px solid var(--border); border-radius: 5px; font-size: 0.85rem; cursor: pointer;
}
select:focus { outline: 1px solid var(--accent); }

.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.stat-item { background: var(--bg-tertiary); padding: 6px 10px; border-radius: 5px; text-align: center; }
.stat-label { display: block; font-size: 0.7rem; color: var(--text-secondary); margin-bottom: 2px; }
.stat-value { display: block; font-size: 0.85rem; font-weight: 700; font-family: 'Courier New', monospace; color: var(--accent); }

.equation-box {
    background: var(--bg-primary); border: 1px solid var(--border); border-radius: 6px;
    padding: 8px 12px; font-family: 'Courier New', monospace; font-size: 0.78rem;
    color: var(--accent2); line-height: 1.8;
}

.rule72-box { background: var(--bg-primary); border-radius: 6px; padding: 10px; }
.rule72-row { display: flex; justify-content: space-between; align-items: center; padding: 4px 0; }
.rule72-row + .rule72-row { border-top: 1px solid var(--border); }
.rule72-label { font-size: 0.8rem; color: var(--text-secondary); }
.rule72-value { font-family: 'Courier New', monospace; font-size: 0.85rem; font-weight: 600; color: var(--warning); }

.display-panel { display: flex; flex-direction: column; gap: 8px; }
.canvas-card { background: var(--bg-secondary); border-radius: 10px; overflow: hidden; }
.canvas-header {
    display: flex; justify-content: space-between; align-items: center; padding: 8px 14px;
    font-size: 0.85rem; font-weight: 600; color: var(--text-primary); border-bottom: 1px solid var(--border);
}
canvas { width: 100%; display: block; }
#growth-canvas { height: 340px; }
#gap-canvas { height: 220px; }
#log-canvas { height: 220px; }
#breakdown-canvas { height: 200px; }
.canvas-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

.education { margin-top: 20px; }
.tabs { display: flex; gap: 6px; margin-bottom: 14px; border-bottom: 2px solid var(--border); padding-bottom: 10px; }
.tab-btn {
    padding: 8px 16px; background: transparent; border: 1px solid var(--border); border-radius: 6px;
    color: var(--text-secondary); cursor: pointer; font-size: 0.85rem; transition: all 0.2s;
}
.tab-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.tab-btn.active { background: var(--accent); border-color: var(--accent); color: white; }
.tab-pane { display: none; }
.tab-pane.active { display: block; animation: fadeIn 0.3s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.edu-card { background: var(--bg-secondary); border-radius: 8px; padding: 16px; margin-bottom: 12px; border-left: 3px solid var(--accent); }
.edu-card h3 { font-size: 1rem; margin-bottom: 8px; color: var(--accent); }
.edu-card p { color: var(--text-secondary); line-height: 1.7; font-size: 0.9rem; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-tertiary); border-radius: 3px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

@media (max-width: 1024px) {
    .main-layout { grid-template-columns: 1fr; }
    .controls-panel {
        position: relative; top: 0; max-height: none;
        display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px;
    }
    .control-section { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
    .canvas-row { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
    header h1 { font-size: 1.4rem; }
    .ci-container { padding: 10px; }
    #growth-canvas { height: 280px; }
    #gap-canvas, #log-canvas { height: 180px; }
    #breakdown-canvas { height: 160px; }
    .tabs { flex-wrap: wrap; }
    .controls-panel { grid-template-columns: 1fr; }
}