/* Remove default spacing */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Page */
body {
    min-height: 100vh;

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

    font-family: Arial, sans-serif;

    background:
        linear-gradient(
            135deg,
            #0f0c29,
            #302b63,
            #24243e
        );

    color: white;

    overflow: hidden;
}


/* =========================
   GAME CONTAINER
   ========================= */

.game-container {
    width: 420px;
    max-width: 90%;

    padding: 40px;

    text-align: center;

    border-radius: 25px;

    background: rgba(255, 255, 255, 0.10);

    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);

    border: 1px solid rgba(255, 255, 255, 0.15);

    box-shadow:
        0 25px 50px rgba(0, 0, 0, 0.5),
        inset 0 1px 1px rgba(255, 255, 255, 0.2);

    transform: perspective(1000px) rotateX(3deg);

    position: relative;
    z-index: 10;
}


/* =========================
   TITLE
   ========================= */

h1 {
    font-size: 42px;

    margin-bottom: 10px;

    background:
        linear-gradient(
            90deg,
            #ff00cc,
            #3333ff,
            #00ffff,
            #00ff88
        );

    -webkit-background-clip: text;
    background-clip: text;

    -webkit-text-fill-color: transparent;

    text-shadow:
        0 8px 20px rgba(0, 0, 0, 0.4);
}


.subtitle {
    color: #dddddd;

    margin-bottom: 30px;

    font-size: 16px;
}


/* =========================
   NUMBER BOX
   ========================= */

.number-box {
    width: 150px;
    height: 150px;

    margin: 25px auto;

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

    border-radius: 20px;

    font-size: 60px;
    font-weight: bold;

    color: #00ffff;

    background:
        linear-gradient(
            145deg,
            #29245c,
            #171435
        );

    text-shadow:
        0 0 20px #00ffff;

    box-shadow:
        10px 10px 20px rgba(0, 0, 0, 0.5),
        -5px -5px 15px rgba(255, 255, 255, 0.08);

    transform:
        perspective(500px)
        rotateY(-8deg);

    transition: 0.3s;
}


/* =========================
   INPUT
   ========================= */

input {
    width: 100%;

    padding: 15px;

    border: 2px solid transparent;
    outline: none;

    border-radius: 12px;

    font-size: 20px;

    text-align: center;

    background: rgba(255, 255, 255, 0.15);

    color: white;

    box-shadow:
        inset 4px 4px 8px rgba(0, 0, 0, 0.3),
        inset -3px -3px 8px rgba(255, 255, 255, 0.1);

    transition: 0.3s;
}


input::placeholder {
    color: #cccccc;
}


input:focus {
    border-color: #00ffff;

    box-shadow:
        0 0 15px rgba(0, 255, 255, 0.5);
}


/* Remove number input arrows */
input::-webkit-inner-spin-button,
input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}


/* =========================
   BUTTON
   ========================= */

button {
    width: 100%;

    margin-top: 20px;

    padding: 15px;

    border: none;

    border-radius: 12px;

    font-size: 18px;
    font-weight: bold;

    color: white;

    cursor: pointer;

    background:
        linear-gradient(
            135deg,
            #ff00cc,
            #3333ff
        );

    box-shadow:
        0 8px 0 #18104f,
        0 15px 25px rgba(0, 0, 0, 0.4);

    transition: 0.2s;
}


button:hover {
    transform: translateY(-3px);

    box-shadow:
        0 11px 0 #18104f,
        0 20px 30px rgba(0, 0, 0, 0.5);
}


button:active {
    transform: translateY(5px);

    box-shadow:
        0 3px 0 #18104f,
        0 8px 15px rgba(0, 0, 0, 0.4);
}


/* Disabled button */
button:disabled {
    cursor: not-allowed;

    opacity: 0.5;

    transform: none;

    box-shadow:
        0 4px 0 #18104f;
}


/* =========================
   MESSAGE
   ========================= */

#message {
    min-height: 30px;

    margin-top: 25px;

    font-size: 20px;

    font-weight: bold;
}


.success {
    color: #00ff88;

    text-shadow:
        0 0 15px #00ff88;
}


.higher {
    color: #ffcc00;

    text-shadow:
        0 0 15px #ffcc00;
}


.lower {
    color: #ff4d6d;

    text-shadow:
        0 0 15px #ff4d6d;
}


.error {
    color: #ff4d6d;

    text-shadow:
        0 0 15px #ff4d6d;
}


/* =========================
   ATTEMPTS
   ========================= */

.attempts {
    margin-top: 15px;

    color: #aaaaaa;

    font-size: 16px;
}


/* =========================
   RESTART BUTTON
   ========================= */

.restart-button {
    background:
        linear-gradient(
            135deg,
            #00c6ff,
            #0072ff
        );
}


/* =========================
   3D FLOATING SHAPES
   ========================= */

.shape {
    position: fixed;

    width: 80px;
    height: 80px;

    border-radius: 20px;

    opacity: 0.2;

    z-index: 1;

    animation:
        float 6s infinite ease-in-out;
}


.shape1 {
    background: #ff00cc;

    top: 10%;
    left: 10%;
}


.shape2 {
    background: #00ffff;

    bottom: 10%;
    right: 10%;

    animation-delay: 2s;
}


.shape3 {
    background: #00ff88;

    top: 20%;
    right: 15%;

    animation-delay: 4s;
}


/* =========================
   FLOAT ANIMATION
   ========================= */

@keyframes float {

    0%,
    100% {
        transform:
            translateY(0)
            rotate(0deg);
    }

    50% {
        transform:
            translateY(-40px)
            rotate(180deg);
    }
}


/* =========================
   MOBILE
   ========================= */

@media (max-width: 500px) {

    .game-container {
        padding: 25px;
    }

    h1 {
        font-size: 32px;
    }

    .number-box {
        width: 120px;
        height: 120px;

        font-size: 50px;
    }
}