body {
    min-height: 100vh;
    margin: 0;
    font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    margin-top: 40px;
    font-size: 2.5rem;
    letter-spacing: 2px;
    background: linear-gradient(90deg, #ffb347, #ffcc33);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tabs {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 28px;
    justify-content: flex-start;
    align-items: flex-start;
    position: fixed;
    left: 24px;
    top: 80px;
    z-index: 10;
}

.tab-btn {
    padding: 12px 32px;
    border: none;
    border-radius: 18px;
    background: #243b55;
    color: #fff;
    font-size: 1.08rem;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    box-shadow: 0 2px 8px rgba(30,60,114,0.08);
    outline: none;
    margin: 0;
    width: 180px;
    text-align: left;
}

.tab-btn.active, .tab-btn:hover {
    background: linear-gradient(90deg, #ffb347, #ffcc33);
    color: #243b55;
    box-shadow: 0 4px 16px rgba(255,204,51,0.15);
}

.tab-content {
    background: rgba(36,59,85,0.95);
    border-radius: 0 0 18px 18px;
    box-shadow: 0 8px 32px rgba(30,60,114,0.18);
    padding: 32px 28px 24px 28px;
    min-width: 340px;
    max-width: 400px;
    margin-bottom: 30px;
    animation: fadeIn 0.5s;
    display: none;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px);}
    to { opacity: 1; transform: translateY(0);}
}

.calc-row {
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

input[type="number"], input[type="text"], select {
    padding: 8px 12px;
    border-radius: 8px;
    border: none;
    background: #f4f7fa;
    color: #243b55;
    font-size: 1rem;
    box-shadow: 0 2px 8px rgba(36,59,85,0.07);
    transition: box-shadow 0.2s;
}

input[type="number"]:focus, input[type="text"]:focus, select:focus {
    outline: none;
    box-shadow: 0 0 0 2px #ffcc33;
}

button {
    padding: 8px 20px;
    border-radius: 8px;
    border: none;
    background: linear-gradient(90deg, #ffb347, #ffcc33);
    color: #243b55;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(255,204,51,0.13);
    transition: background 0.2s, transform 0.1s;
}

button:hover, button:focus {
    background: linear-gradient(90deg, #ffcc33, #ffb347);
    transform: translateY(-2px) scale(1.04);
}

.result {
    font-size: 1.2rem;
    margin-top: 8px;
    color: #ffeb3b;
    background: rgba(36,59,85,0.5);
    border-radius: 8px;
    padding: 10px 14px;
    min-height: 28px;
    box-shadow: 0 2px 8px rgba(255,204,51,0.08);
    word-break: break-all;
}

label {
    font-weight: 500;
    color: #ffcc33;
    margin-right: 6px;
}

@media (max-width: 900px) {
    .tabs {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
        justify-content: center;
        align-items: center;
        margin-bottom: 18px;
    }
    .tab-btn {
        width: auto;
        text-align: center;
        padding: 10px 18px;
        font-size: 1rem;
    }
}

@media (max-width: 700px) {
    body {
        margin: 0;
        padding: 0;
        align-items: stretch;
        min-width: 100vw;
        background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    }
    h1 {
        font-size: 1.2rem;
        margin-top: 12px;
        margin-bottom: 10px;
        text-align: center;
    }
    .tabs {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 6px;
        width: 100vw;
        justify-content: center;
        align-items: flex-start;
        margin: 0 0 10px 0;
        z-index: 10;
        background: none;
    }
    .tab-btn {
        width: 48vw;
        min-width: 120px;
        max-width: 100vw;
        text-align: center;
        padding: 10px 0;
        font-size: 0.98rem;
        margin: 0;
        border-radius: 12px;
        box-sizing: border-box;
    }
    .tab-content {
        min-width: 96vw;
        max-width: 98vw;
        padding: 12px 2vw 10px 2vw;
        margin: 0 auto 18vw auto;
        border-radius: 12px;
        box-sizing: border-box;
    }
    .calc-row {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        margin-bottom: 14px;
    }
    input[type="number"], input[type="text"], select, button {
        font-size: 1.05rem;
        width: 100%;
        box-sizing: border-box;
        margin: 0;
    }
    .result {
        font-size: 1.05rem;
        padding: 8px 8px;
        min-height: 22px;
        margin-top: 8px;
        word-break: break-word;
    }
    .footer-note, .footer-credit, .support-btn, .support-contact {
        position: static !important;
        left: unset !important;
        right: unset !important;
        bottom: unset !important;
        transform: none !important;
        margin: 10px auto 0 auto !important;
        display: block !important;
        text-align: center !important;
        width: 96vw !important;
        max-width: 98vw !important;
        font-size: 0.98rem !important;
        border-radius: 10px !important;
        z-index: 1 !important;
    }
    .support-btn {
        margin-top: 10px !important;
        margin-bottom: 2px !important;
        padding: 10px 0 !important;
        font-size: 1.05rem !important;
        width: 96vw !important;
    }
    .support-contact {
        margin-bottom: 10px !important;
        font-size: 0.95rem !important;
    }
}

.footer-note {
    position: fixed;
    left: 18px;
    bottom: 12px;
    background: rgba(36,59,85,0.92);
    color: #ffe082;
    font-size: 1.05rem;
    font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
    font-style: normal;
    font-weight: 600;
    border-radius: 10px 18px 18px 10px;
    padding: 10px 18px 10px 16px;
    box-shadow: 0 2px 12px rgba(255,204,51,0.13);
    opacity: 0.93;
    z-index: 99;
    max-width: 340px;
    pointer-events: none;
    user-select: none;
    letter-spacing: 0.2px;
    border-left: 4px solid #ffb347;
    transition: background 0.3s, color 0.3s;
}

.footer-credit {
    position: fixed;
    right: 18px;
    bottom: 12px;
    background: rgba(36,59,85,0.92);
    color: #b3e5fc;
    font-size: 1.05rem;
    font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
    font-style: normal;
    font-weight: 600;
    border-radius: 18px 10px 10px 18px;
    padding: 10px 16px 10px 18px;
    box-shadow: 0 2px 12px rgba(51,204,255,0.13);
    opacity: 0.93;
    z-index: 99;
    pointer-events: none;
    user-select: none;
    letter-spacing: 0.2px;
    border-right: 4px solid #4fc3f7;
    text-align: right;
    transition: background 0.3s, color 0.3s;
}

.support-btn {
    position: fixed;
    right: 50%;
    transform: translateX(50%);
    bottom: 54px;
    background: linear-gradient(90deg, #ffb347, #ffcc33);
    color: #243b55;
    font-weight: bold;
    font-size: 1.08rem;
    padding: 12px 32px;
    border-radius: 24px;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(255,204,51,0.18);
    z-index: 100;
    transition: background 0.2s, color 0.2s, transform 0.15s;
    letter-spacing: 0.5px;
    border: 2px solid #fffde7;
}

.support-btn:hover, .support-btn:focus {
    background: linear-gradient(90deg, #ffcc33, #ffb347);
    color: #1e3c72;
    transform: translateX(50%) scale(1.05);
    box-shadow: 0 8px 24px rgba(255,204,51,0.25);
}

.support-contact {
    position: fixed;
    right: 50%;
    transform: translateX(50%);
    bottom: 10px; /* sebelumnya 28px, digeser lebih ke bawah */
    font-size: 0.92rem;
    color: #b3e5fc;
    opacity: 0.92;
    z-index: 101;
    background: rgba(36,59,85,0.92);
    padding: 4px 16px 4px 16px;
    border-radius: 12px;
    pointer-events: none;
    user-select: text;
    text-align: center;
    letter-spacing: 0.1px;
}

/* Hide scrollbars on mobile for cleaner look */
@media (max-width: 700px) {
    html, body {
        overflow-x: hidden;
    }
}