:root {
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent-cyber: #06b6d4;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --danger: #f43f5e;
}

body {
    margin: 0;
    font-family: 'Outfit', sans-serif;
    background: #020617;
    color: var(--text-primary);
    overflow-x: hidden;
    min-height: 100vh;
}

.bg-aurora {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 10% 10%, rgba(6, 182, 212, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 90% 90%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
}

#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.app-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 10;
}

/* Header */
.calc-header { margin-bottom: 40px; }
.nav-top { margin-bottom: 20px; }
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-cyber);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 6px 14px;
    background: rgba(6, 182, 212, 0.05);
    border-radius: 20px;
    border: 1px solid rgba(6, 182, 212, 0.2);
    transition: all 0.3s ease;
}
.back-link:hover { background: rgba(6, 182, 212, 0.1); transform: translateX(-4px); }

.hero-title { font-size: 2.8rem; font-weight: 800; margin: 0; letter-spacing: -0.02em; }
.hero-subtitle { color: var(--text-secondary); margin-top: 10px; font-size: 1.1rem; }

/* Context Toggle */
.context-toggle {
    display: flex;
    gap: 8px;
    padding: 6px;
    border-radius: 16px;
    margin-bottom: 30px;
    width: fit-content;
    background: rgba(255, 255, 255, 0.02);
}

.toggle-btn {
    padding: 10px 24px;
    border-radius: 12px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.toggle-btn.active {
    background: var(--accent-cyber);
    color: #000;
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

/* Layout */
.grid-layout { display: grid; grid-template-columns: 1.2fr 1fr; gap: 30px; margin-bottom: 30px; }

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 30px;
}

/* Methods Tabs */
.sub-methods { margin-bottom: 30px; }
.section-label { display: block; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent-cyber); margin-bottom: 15px; font-weight: 700; }
.method-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tab-btn {
    padding: 8px 16px;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
}
.tab-btn.active { border-color: var(--accent-cyber); color: var(--accent-cyber); background: rgba(6, 182, 212, 0.1); }

/* Inputs */
.input-group { margin-bottom: 25px; }
.input-group label { display: block; margin-bottom: 12px; color: var(--text-primary); font-weight: 500; }
.input-wrapper { position: relative; display: flex; align-items: center; margin-bottom: 15px; }
input[type="number"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    padding: 14px 20px;
    border-radius: 12px;
    color: #fff;
    font-size: 1.2rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.3s;
}
input[type="number"]:focus { border-color: var(--accent-cyber); }

input[type="range"] {
    width: 100%;
    accent-color: var(--accent-cyber);
    cursor: pointer;
}

.info-box {
    background: rgba(6, 182, 212, 0.05);
    border-left: 4px solid var(--accent-cyber);
    padding: 15px;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Result Panel */
.result-display { text-align: center; margin-bottom: 30px; }
.result-label { color: var(--text-secondary); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; }
.result-value { margin: 15px 0; }
#pel-value { font-size: 4rem; font-weight: 800; color: #fff; }
#pel-unit { font-size: 1.2rem; color: var(--accent-cyber); margin-left: 8px; }

.formula-box {
    font-family: monospace;
    background: rgba(0,0,0,0.2);
    padding: 10px;
    border-radius: 8px;
    display: inline-block;
    color: var(--accent-emerald);
    font-size: 1rem;
}

.compliance-badge {
    text-align: center;
    padding: 12px;
    border-radius: 12px;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    margin-bottom: 30px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-emerald);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.mini-title { font-size: 0.7rem; text-transform: uppercase; color: var(--accent-amber); margin-bottom: 8px; }
.regulatory-ref p { font-size: 0.8rem; color: var(--text-secondary); margin: 0; line-height: 1.4; }

/* Methodology Section */
.methodology-details h3 { font-size: 1.5rem; margin-bottom: 25px; }
.methods-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.method-card { background: rgba(255,255,255,0.02); border: 1px solid var(--glass-border); padding: 20px; border-radius: 16px; transition: transform 0.3s; }
.method-card:hover { transform: translateY(-5px); border-color: rgba(255,255,255,0.2); }
.method-card h5 { margin: 0 0 10px; color: var(--accent-cyber); font-size: 1rem; }
.method-card p { margin: 0 0 10px; font-weight: 600; font-family: monospace; }
.method-card small { color: var(--text-secondary); font-size: 0.8rem; }

@media (max-width: 900px) {
    .grid-layout { grid-template-columns: 1fr; }
    .hero-title { font-size: 2.2rem; }
}