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

body {
    font-family: 'Poppins', sans-serif;
}

/* 🔹 ABOUT SECTION */
.about {
    text-align: center;
    padding: 50px 20px;
    background: #ffffff;
}

.about h1 {
    font-size: 32px;
    color: #0b2c4a;
    margin-bottom: 10px;
}

.about p {
    max-width: 700px;
    margin: auto;
    color: #555;
    line-height: 1.6;
}

/* 🔹 HERO BACKGROUND */
.hero {
    min-height: 100vh;
    background: linear-gradient(rgba(11,44,74,0.9), rgba(30,94,216,0.9)),
        url('https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 🔹 LAYOUT */
.container {
    display: flex;
    gap: 30px;
    max-width: 1000px;
    width: 100%;
    padding: 20px;
}

/* 🔹 CARD (LEFT CALCULATOR) */
.card {
    width: 380px;
    background: rgba(255,255,255,0.95);
    padding: 25px;
    border-radius: 15px;
    color: #0b2c4a;
    box-shadow: 0 15px 40px rgba(0,0,0,0.3);
}

.card h2 {
    text-align: center;
    margin-bottom: 15px;
}

/* 🔹 RIGHT PANEL */
.right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
    color: white;
}

/* 🔹 INFO BOXES */
.guide-box, .usage-box {
    background: rgba(255,255,255,0.12);
    padding: 20px;
    border-radius: 12px;
    backdrop-filter: blur(8px);
}

.guide-box h3,
.usage-box h3 {
    margin-bottom: 10px;
}

/* 🔹 FORM */
label {
    margin-top: 10px;
    display: block;
    font-size: 13px;
    font-weight: 500;
}

input, select {
    width: 100%;
    padding: 12px;
    margin-top: 5px;
    border-radius: 8px;
    border: 1px solid #ccc;
    outline: none;
    font-size: 14px;
}

/* INPUT FOCUS */
input:focus, select:focus {
    border-color: #0d6efd;
}

/* 🔹 RESULT BOX */
.result-box {
    margin-top: 15px;
    padding: 15px;
    background: #f1f5f9;
    border-radius: 10px;
    text-align: center;
    font-size: 22px;
    font-weight: bold;
}

/* 🔹 BUTTON GROUP */
.btn-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

/* CALCULATE BUTTON */
.calc-btn {
    flex: 1;
    padding: 12px;
    background: linear-gradient(90deg, #0b2c4a, #1e5ed8);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: 0.3s;
}

/* RESET BUTTON */
.reset-btn {
    flex: 1;
    padding: 12px;
    background: #e5e7eb;
    color: #0b2c4a;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: 0.3s;
}

/* BUTTON HOVER */
.calc-btn:hover,
.reset-btn:hover {
    transform: scale(1.05);
}

/* 🔹 LIST */
.usage-box ul {
    list-style: none;
    margin-top: 10px;
    padding: 0;
}

.usage-box li {
    margin: 6px 0;
}

/* 🔹 MOBILE RESPONSIVE */
@media(max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .card {
        width: 100%;
    }

    .right-panel {
        text-align: left;
    }
}