body {
    background-color: #0f172a;
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
}

h1 {
    color: #ffffff;
    font-size: 32px;
    margin: 20px;
}

p {
    color: #ffffff;
    font-size: 16px;
}

/* Buttons */

button {
    background-color: #2563eb;
    color: #ffffff;
    font-size: 16px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition:
        0.2s transform ease,
        0.2s background-color ease,
        0.2s box-shadow ease;
}

button:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

button:active {
    transform: translateY(0);
    box-shadow: none;
}

/* Puzzle */

.container {
    width: 320px;
    height: 320px;
    margin: 20px auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    border-radius: 10px;
    box-shadow: 4px 12px 12px rgba(0, 0, 0, 0.2);
}

.tiles {
    background-color: #ffffff;
    color: #0f172a;
    font-size: 24px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 8px;
    cursor: pointer;
    min-width: 0;
    width: 100%;
    height: 100%;
    transition:
        0.2s background-color ease,
        0.2s transform ease,
        0.2s box-shadow ease;
}

.tiles:hover {
    background-color: #dbeafe;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.tiles:active {
    transform: translateY(0);
    box-shadow: none;
}

.blank {
    background-color: #1e293b;
    cursor: default;
    border-radius: 8px;
}

/* Stats */

.stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
    margin-bottom: 15px;
}

.stats div {
    background-color: #1e293b;
    color: #ffffff;
    padding: 8px 12px;
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

/* Win message */

#winMessage {
    color: #22c55e;
    font-size: 24px;
    font-weight: bold;
    margin: 15px;
}

/* Puzzle size selector */

select {
    font-size: 20px;
    padding: 5px 10px;
    border: none;
    border-radius: 8px;
    width: 150px;
    cursor: pointer;
    background-color: #2563eb;
    color: #ffffff;
    transition:
        0.2s background-color ease,
        0.2s transform ease,
        0.2s box-shadow ease;
}

select:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.select-buttons {
    border: 1px solid black;
}

/* Header */

header {
    background-color: #020617;
    height: 70px;
    padding: 0 15px;
    box-sizing: border-box;
    display: flex;
    justify-content: flex-end;
    align-items: flex-start;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* Account buttons */

.account {
    margin-top: 15px;
    background-color: #7c3aed;
}

.account:hover {
    background-color: #6d28d9;
    box-shadow: 0 4px 10px rgba(124, 58, 237, 0.3);
}

#login {
    margin-right: 10px;
}

/* Account overlay */

#overlay {
    background-color: rgba(0, 0, 0, 0.7);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: none;
}

/* Account panel */

#accountPanel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 350px;
    height: 425px;
    background-color: #1e293b;
    border-radius: 12px;
    z-index: 1001;
    display: none;
    padding: 20px;
    box-sizing: border-box;
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.4);
}

#closePanel {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 32px;
    height: 32px;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    background-color: #334155;
    border-radius: 6px;
}

#closePanel:hover {
    background-color: #475569;
}

/* Account heading */

#loginH2 {
    color: #ffffff;
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
}

/* Account inputs */

#username,
#email,
#password {
    width: 100%;
    box-sizing: border-box;
    height: 42px;
    padding: 10px;
    font-size: 16px;
    background-color: #0f172a;
    color: #ffffff;
    border: 1px solid #475569;
    border-radius: 8px;
    outline: none;
    transition: 0.2s border-color ease, 0.2s box-shadow ease;
}

#username:focus,
#email:focus,
#password:focus {
    border-color: #7c3aed;
    box-shadow: 0 0 0 2px rgba(124, 58, 237, 0.2);
}

#usernameLabel,
#emailLabel,
#passwordLabel {
    color: #ffffff;
    display: block;
}

#usernameLabel {
    margin-bottom: 8px;
}

#emailLabel,
#passwordLabel {
    margin-top: 8px;
    margin-bottom: 8px;
}

/* Signup link */

#signupLink {
    color: #3030ff;
    cursor: pointer;
    text-decoration: underline;
}

#signupLink:hover {
    color: #6366f1;
}

/* Login button */

#loginButton {
    background-color: #7c3aed;
    margin-top: 10px;
}

#loginButton:hover {
    background-color: #6d28d9;
}

/* Account errors */

#accountError {
    color: #ef4444;
    font-size: 14px;
    margin: 10px 0;
}

/* Scoreboard */

#scoreboard {
    width: 90%;
    max-width: 500px;
    margin: 25px auto;
    padding: 20px;
    box-sizing: border-box;
    background-color: #1e293b;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

#scoreboard h2 {
    color: #ffffff;
    font-size: 24px;
    margin: 0 0 15px 0;
    font-weight: bold;
}

#scoreList div {
    background-color: #0f172a;
    color: #ffffff;
    padding: 10px;
    margin: 10px 0;
    border-radius: 8px;
    font-size: 16px;
}

#scoreList .score-entry {
    transition:
        0.2s background-color ease,
        0.2s transform ease;
}

#scoreList .score-entry:hover {
    background-color: #172033;
    transform: translateY(-1px);
}

.score-header,
.score-entry {
    display: grid;
    grid-template-columns: 30px 2fr 1.2fr 1.2fr 1.2fr 1.2fr;
    gap: 8px;
    text-align: center;
    align-items: center;
}

.score-header {
    font-weight: bold;
    margin-bottom: 10px;
}

.score-header span:nth-child(2),
.score-entry span:nth-child(2) {
    text-align: left;
}

/* Mobile */

@media (max-width: 600px) {
    .container {
        width: 90vw;
        height: 90vw;
        max-width: 320px;
        max-height: 320px;
    }

    .stats {
        flex-wrap: wrap;
    }

    #scoreboard {
        width: 95%;
        margin: 20px auto;
        padding: 15px;
        overflow-x: auto;
    }

    .score-header,
    .score-entry {
        gap: 5px;
        font-size: 14px;
    }

    #scoreList div {
        padding: 8px;
    }

    #accountPanel {
        width: 90%;
        max-width: 350px;
    }
}
#loginNotice {
    position: fixed;
    top: 10px;
    left: 10px;
    margin: 0;
    font-size: 13px;
    z-index: 1000;
}