/* Root colors */
:root {
    --primary-blue: #007BFF;
    --dark-blue: #0056b3;
    --black: #000000;
    --light-grey: #f5f5f5;
    --white: #ffffff;
    --highlight-red: #cb0c1f;
    --highlight-green: #28a745;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #89f7fe, #66a6ff);
    overflow-x: hidden;
    animation: backgroundAnimation 10s infinite alternate ease-in-out;
    min-height: 100vh;
}

@keyframes backgroundAnimation {
    0% { background-position: left; }
    100% { background-position: right; }
}

/* Main content */
main {
    animation: fadeInMain 1.5s ease;
}

@keyframes fadeInMain {
    0% { opacity: 0; transform: scale(0.9); }
    100% { opacity: 1; transform: scale(1); }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

/* Buttons */
button, .button {
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
    border: none;
    background-color: var(--primary-blue);
    color: var(--white);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 0.5rem 0;
}

button:hover, .button:hover {
    background-color: var(--dark-blue);
    transform: translateY(-2px);
}

.button-secondary {
    background-color: var(--light-grey);
    color: var(--black);
}

.button-secondary:hover {
    background-color: #e0e0e0;
}

.button-danger {
    background-color: var(--highlight-red);
}

.button-danger:hover {
    background-color: #a00;
}

.button-success {
    background-color: var(--highlight-green);
}

.button-success:hover {
    background-color: #218838;
}

/* Forms */
input[type="text"],
input[type="tel"],
input[type="password"],
input[type="email"],
input[type="date"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.8rem;
    border-radius: 5px;
    border: 1px solid #ccc;
    font-size: 1rem;
    margin: 0.5rem 0;
    transition: border-color 0.3s ease;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--primary-blue);
    outline: none;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: var(--primary-blue);
    color: var(--white);
    font-weight: bold;
}

tr:hover {
    background-color: var(--light-grey);
}

/* Navigation */
.sideNav {
    background: var(--dark-blue);
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
}

.sideNav a {
    color: var(--white);
    text-decoration: none;
    padding: 0.5rem 1rem;
    display: block;
    transition: background-color 0.3s ease;
    border-radius: 5px;
}

.sideNav a:hover {
    background-color: var(--primary-blue);
}

.sideNav a.active {
    background-color: var(--primary-blue);
    font-weight: bold;
}

/* Messages */
.message-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 1rem 2rem;
    border-radius: 5px;
    color: var(--white);
    z-index: 1000;
    text-align: center;
    animation: slideDown 0.5s ease;
}

.message-container.success {
    background-color: var(--highlight-green);
}

.message-container.error {
    background-color: var(--highlight-red);
}

@keyframes slideDown {
    from { transform: translate(-50%, -100%); }
    to { transform: translate(-50%, 0); }
}

/* Cards */
.card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    main {
        margin: 10px;
        padding: 1rem;
    }

    .sideNav {
        padding: 0.5rem;
    }

    table {
        display: block;
        overflow-x: auto;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.25rem; }
    h5 { font-size: 1.1rem; }
    h6 { font-size: 1rem; }
}

/* Game-specific styles */
.game-container {
    background: var(--white);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    margin: 20px auto;
    max-width: 800px;
}

.game-board {
    display: grid;
    gap: 10px;
    margin: 20px 0;
}

.game-cell {
    aspect-ratio: 1;
    background: var(--light-grey);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.game-cell:hover {
    background: #e0e0e0;
    transform: scale(1.05);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #89f7fe, #66a6ff);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease-out;
}

.loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Sections */
section {
    padding: 60px 20px;
    text-align: center;
    background-color: var(--white);
    margin: 30px 15px;
    border-radius: 20px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
    transform: translateY(50px);
    opacity: 0;
    transition: all 0.8s ease-out;
}

section.active {
    transform: translateY(0);
    opacity: 1;
}

section h2 {
    color: var(--primary-blue);
    margin-bottom: 20px;
    font-size: 2rem;
}