:root {
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-sub: #64748b;
    --input-border: #e2e8f0;
    --primary: #4f46e5;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
}

[data-theme='dark'] {
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-sub: #94a3b8;
    --input-border: #334155;
    --primary: #818cf8;
}

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: background-color 0.3s;
}

.app-container { width: 100%; max-width: 550px; padding: 15px; }

.main-card {
    background: var(--card-bg);
    border-radius: 32px;
    padding: 35px;
    box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.25);
    position: relative;
}

.top-left { position: absolute; top: 25px; left: 25px; }
.top-right { position: absolute; top: 25px; right: 25px; }

.control-btn {
    background: var(--bg);
    border: none;
    padding: 10px 18px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 700;
    color: var(--text-main);
    font-size: 0.9rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: all 0.2s;
}

.control-btn:hover { transform: translateY(-1px); background: var(--input-border); }

.header { text-align: center; margin-bottom: 30px; margin-top: 15px; }
.header h1 { font-size: 1.8rem; color: var(--primary); margin: 0; }

.input-section { margin-bottom: 25px; }
.label-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
label { font-size: 1.1rem; font-weight: 700; }
.current-val { font-size: 1rem; font-weight: 800; color: var(--primary); background: rgba(79, 70, 229, 0.1); padding: 4px 12px; border-radius: 8px; }

.species-selector { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 20px; }
.species-btn {
    padding: 15px; border: 2px solid var(--input-border); border-radius: 16px;
    text-align: center; cursor: pointer; font-weight: 700; font-size: 1.1rem;
    transition: 0.2s; background: var(--card-bg); color: var(--text-main);
}
.species-btn.active { background: var(--primary); color: white; border-color: var(--primary); }

input[type="number"], select {
    width: 100%; padding: 16px; border: 2px solid var(--input-border);
    border-radius: 16px; font-size: 1.2rem; font-weight: 600;
    background: var(--card-bg); color: var(--text-main); box-sizing: border-box;
}

input[type="range"] { width: 100%; margin-top: 15px; accent-color: var(--primary); }

.result-panel {
    margin-top: 30px; border-radius: 28px; padding: 30px;
    text-align: center; transition: 0.4s; border: 4px solid var(--input-border);
}

.state-safe { background-color: rgba(5, 150, 105, 0.1); border-color: var(--success); color: var(--success); }
.state-warn { background-color: rgba(217, 119, 6, 0.1); border-color: var(--warning); color: var(--warning); }
.state-error { background-color: rgba(220, 38, 38, 0.1); border-color: var(--danger); color: var(--danger); }

.res-main { font-size: 3.5rem; font-weight: 900; letter-spacing: -2px; margin: 10px 0; }
.status-msg { font-size: 1.3rem; font-weight: 800; margin-top: 15px; }

.stock-info {
    margin-top: 20px; font-size: 1rem; color: var(--text-sub);
    background: rgba(0,0,0,0.05); padding: 12px; border-radius: 12px; font-weight: 600;
}