header {
    background: linear-gradient(to right, #0f0f0f 0%, #333333  50%, #0f0f0f 100%);
    height: 100px; 
    width: 100%;

    align-items: center;
    display: flex;
}

body {
    margin: 0;
    padding: 0;
}

#name_web {
    color: #ffffff;
    font-family: "Montserrat";
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-left: 5%;
    font-size: 30px;
    margin-right: 5%;
}

#name_web_2 {
    color: #ffb733;
}

#menu {
    background-color: #22222233;
    height: 60px;
    width: 600px;
    margin-right: 5%;
    margin-left: auto;
    border-radius: 10px;
    align-items: center;
    display: flex;
    border: 2px solid #2828284d;
    gap: 5%;
}

.link_menu {
    color: #999999;
    font-size: 25px;
    transition: transform 0.3s ease; 
    text-decoration: none;
    margin: 0;
}

.link_menu:not(#first_cl):hover {
    transform: scale(1.1);
    color: #ffb733;
}

#first_cl {
    color: #ffb733;
    text-decoration: underline;
    text-underline-offset: 21px;
    text-decoration-color: #ffb733;
    text-shadow: 0 0 8px #ffb733;
    margin: 0;
}

#first {
    margin-left: auto;
}

#last {
    margin-right: auto;
}


section {
    width: 100%;
    height: 90vh;
    background:
        radial-gradient(
            circle at top center,
            rgba(255, 255, 255, 0.08),
            rgba(0, 0, 0, 0.95) 60%
        ),
        linear-gradient(
            to bottom,
            #1a1a1a,
            #0b0b0b
        );
    display: flex;
    flex-direction: column;
    align-items: center;
}


.calculator {
    margin-top: 50px;
    margin-bottom: 50px;
    width: 340px;
    padding: 20px;
    background:
        linear-gradient(145deg, #2f2f2f, #1a1a1a);
    border-radius: 16px;
    box-shadow:
        inset 0 0 0 1px rgba(255,255,255,0.05),
        inset 0 -4px 8px rgba(0,0,0,0.8),
        0 20px 40px rgba(0,0,0,0.9);
}


.calc-display {
    height: 70px;
    margin-bottom: 20px;
    padding: 10px 14px;
    background:
        linear-gradient(180deg, #111, #000);
    border-radius: 10px;
    color: #f5c76a;
    font-size: 50px;
    text-align: right;
    box-shadow:
        inset 0 0 10px rgba(0,0,0,0.9),
        inset 0 0 2px rgba(255,255,255,0.1);
    text-shadow: 0 0 6px rgba(245,199,106,0.4);
    overflow: hidden;
}


.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.btn {
    height: 55px;
    border-radius: 10px;
    border: none;
    font-size: 20px;
    color: #ddd;
    cursor: pointer;

    background:
        linear-gradient(145deg, #3a3a3a, #1c1c1c);

    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.08),
        inset 0 -2px 4px rgba(0,0,0,0.9),
        0 6px 10px rgba(0,0,0,0.8);

    transition: transform 0.08s ease, box-shadow 0.08s ease;
}

.btn:hover {
    filter: brightness(1.1);
}

.btn:active {
    transform: translateY(2px);
    box-shadow:
        inset 0 2px 6px rgba(0,0,0,0.9);
}

.operator {
    color: #f5c76a;
    background:
        linear-gradient(145deg, #4a3a1a, #2a1f0d);
    text-shadow: 0 0 4px rgba(245,199,106,0.4);
}

.equal {
    background:
        linear-gradient(145deg, #c89a3c, #8a651f);
    color: #111;
    font-size: 26px;
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.3),
        0 8px 16px rgba(0,0,0,0.9);
}


.zero {
    grid-column: span 2;
}

.clear {
    color: #ff6b6b;
    background:
        linear-gradient(145deg, #4a1f1f, #2a0f0f);
}


.sign {
    color: #9ddcff;
    background:
        linear-gradient(145deg, #1f3a4a, #0f1f2a);
}









footer {
    background: linear-gradient(to right, #0f0f0f 0%, #333333  50%, #0f0f0f 100%);
    height: 100px; 
    width: 100%;

    align-items: center;
    display: flex;
    justify-content: center;
}

#footer-text {
    margin-left: 5%;
    color: #777777;
}