/* ===========================
   COLOR SYSTEM
   =========================== */
:root {
    --primary-color: #2E5BFF;
    --accent-color: #09274A;
    --text-color: #333333;
    --bg-main: #ffffff;
    --bg-secondary: #fafafa;
    --bg-third: #f5f5f5;
}

/* ===========================
   BASE
   =========================== */
body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    color: var(--text-color);
    background: linear-gradient(135deg, #ffffff 0%, #f0f6ff 50%, #e8fdf1 100%);
}

main {
    max-width: 800px;
    margin: auto;
    padding: 20px;
}

h1, h2, h3 {
    color: var(--primary-color);
}

.intro-text {
    max-width: 620px;
    margin-bottom: 25px;
}

/* ===========================
   TOOL BOX
   =========================== */
.tool {
    background: var(--bg-main);
    padding: 20px;
    margin-top: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

.input-group {
    margin-bottom: 15px;
    display: flex;
    gap: 10px;
    align-items: center;
}

input, select {
    padding: 8px;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 5px;
    flex: 1;
}

/* ===========================
   RESULTS TABLE
   =========================== */
.result-box {
    margin-top: 25px;
}

#resultTable {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

#resultTable th {
    background: var(--bg-secondary);
    padding: 10px;
    text-align: left;
    width: 32%;
    color: var(--primary-color);
}

#resultTable td {
    padding: 10px;
    background: white;
    border-bottom: 1px solid #e8e8e8;
    font-weight: 600;
    color: var(--accent-color);
}

#outFormula {
    font-family: monospace;
    background: var(--bg-third);
    border-radius: 4px;
    padding: 6px;
}

/* ===========================
   BUTTONS
   =========================== */
button {
    cursor: pointer;
    padding: 0.55rem 1rem;
    border-radius: 5px;
    border: 1px solid var(--primary-color);
    background: var(--bg-secondary);
    color: var(--primary-color);
    font-size: 0.95rem;
}

button:hover {
    background: var(--primary-color);
    color: white;
}

/* ===========================
   INFO SECTION
   =========================== */
.info-section {
    margin-top: 35px;
    padding: 20px;
    background: rgba(255,255,255,0.35);
    border-radius: 8px;
    line-height: 1.6;
}

/* ===========================
   FOOTER
   =========================== */
footer {
    background: var(--accent-color);
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 30px;
}