:root {
    --primary-color: #4A90E2;
    --rgb-primary: 74, 144, 226;
    --primary-darker: #357ABD;
    --secondary-color: #A8B2C2;
    --light-text: #E0EFFF;
    --dark-bg: #0A192F;
    --dark-bg-alt: #11223E;
    --dark-card-bg: #172A46;
    --border-radius: 10px;
    --transition-speed: 0.3s;
    --font-family: 'Poppins', sans-serif;
    --heading-font: 'Orbitron', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    line-height: 1.8;
    color: var(--secondary-color);
    background-color: var(--dark-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 30px 15px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-darker) var(--dark-bg);
}

body::-webkit-scrollbar {
    width: 12px;
}

body::-webkit-scrollbar-track {
    background: var(--dark-bg-alt);
    border-radius: 10px;
}

body::-webkit-scrollbar-thumb {
    background-color: var(--primary-darker);
    border-radius: 10px;
    border: 3px solid var(--dark-bg-alt);
}

body::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary-color);
}

.rules-page-wrapper {
    width: 100%;
    max-width: 1200px;
}

.rules-container {
    width: 100%;
    background-image: linear-gradient(160deg, var(--dark-bg-alt) 0%, #0c1d33 100%);
    padding: 40px 50px;
    border-radius: var(--border-radius);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(var(--rgb-primary), 0.1);
}

.rules-header {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.rules-header h1 {
    font-family: var(--heading-font);
    color: var(--primary-color);
    font-size: 2.8rem;
    margin-bottom: 30px;
    text-shadow: 0 0 15px rgba(var(--rgb-primary), 0.6), 0 0 25px rgba(var(--rgb-primary), 0.4);
    letter-spacing: 1px;
}

.back-to-home {
    position: absolute;
    top: -30px;
    left: 0;
    display: inline-flex;
    align-items: center;
    padding: 10px 18px;
    background-color: rgba(var(--rgb-primary), 0.1);
    color: var(--primary-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
    border: 1px solid rgba(var(--rgb-primary), 0.3);
}
.back-to-home .material-symbols-outlined {
    margin-right: 8px;
    font-size: 1.1em;
    transition: transform 0.2s ease-out;
}
.back-to-home:hover {
    background-color: rgba(var(--rgb-primary), 0.2);
    transform: translateY(-2px);
    border-color: rgba(var(--rgb-primary), 0.5);
}
.back-to-home:hover .material-symbols-outlined {
    transform: translateX(-4px);
}

.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

#searchInput {
    width: 100%;
    padding: 15px 50px 15px 25px;
    border-radius: var(--border-radius);
    border: 1px solid var(--dark-card-bg);
    background-color: var(--dark-bg);
    color: var(--light-text);
    font-size: 1.05rem;
    outline: none;
    transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

#searchInput:focus {
    border-color: var(--primary-color);
    background-color: var(--dark-card-bg);
    box-shadow: 0 0 0 4px rgba(var(--rgb-primary), 0.25), 0 5px 15px rgba(var(--rgb-primary),0.1);
}

#searchInput::placeholder {
    color: var(--secondary-color);
    opacity: 0.8;
}

.search-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-color);
    font-size: 1.6rem;
    pointer-events: none;
    transition: color var(--transition-speed) ease;
}
#searchInput:focus + .search-icon {
    color: var(--primary-color);
}

.rules-content {
    margin-top: 30px;
}

.rules-category {
    background-color: var(--dark-card-bg);
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    border: 1px solid rgba(var(--rgb-primary), 0.15);
    overflow: hidden;
    transition: box-shadow var(--transition-speed) ease, border-color var(--transition-speed) ease, transform 0.2s ease-out;
    position: relative;
}
.rules-category:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(var(--rgb-dark-bg), 0.5);
    border-color: rgba(var(--rgb-primary), 0.3);
}

.rules-category::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-darker), var(--primary-color));
    transition: width 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    border-top-left-radius: var(--border-radius);
    border-top-right-radius: var(--border-radius);
}

.rules-category[open] {
    box-shadow: 0 10px 30px rgba(var(--rgb-primary), 0.1);
    border-color: rgba(var(--rgb-primary), 0.4);
}
.rules-category:hover::before,
.rules-category[open]::before {
    width: 100%;
}

.rules-category summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    cursor: pointer;
    font-family: var(--heading-font);
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--light-text);
    background-color: transparent;
    transition: background-color var(--transition-speed) ease;
    outline: none; 
    position: relative;
}

.rules-category summary:hover {
    background-color: rgba(var(--rgb-primary), 0.05);
}
.rules-category[open] summary {
    background-color: rgba(var(--rgb-primary), 0.1);
}
.rules-category summary:focus-visible { 
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
    border-radius: var(--border-radius);
}

.rules-category summary::marker,
.rules-category summary::-webkit-details-marker {
    display: none;
}

.rules-category summary::after {
    content: 'expand_more'; 
    font-family: 'Material Symbols Outlined';
    font-variation-settings: 'wght' 500;
    font-size: 1.8rem; 
    color: var(--primary-color);
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    margin-left: 15px; 
}

.rules-category[open] summary::after {
    transform: rotate(180deg); 
}

.rules-details {
    padding: 0 30px; 
    border-top: 1px solid rgba(var(--rgb-primary), 0.1);
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.6s cubic-bezier(0.23, 1, 0.32, 1), opacity 0.5s ease-in-out, padding 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.rules-details p {
    margin-bottom: 1.2em;
    color: var(--secondary-color);
    font-size: 1rem;
}
.rules-category[open] .rules-details {
    padding: 25px 30px; 
    max-height: 5000px; 
    opacity: 1;
}


.rules-details strong {
    color: var(--light-text);
    font-weight: 600;
}

.rules-details h3 {
    font-family: var(--heading-font);
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-top: 1.8em;
    margin-bottom: 1em;
    border-bottom: 1px solid rgba(var(--rgb-primary), 0.2);
    padding-bottom: 0.5em;
    letter-spacing: 0.5px;
}
.rules-details h4 {
    font-family: var(--font-family);
    color: var(--light-text);
    font-size: 1.05rem;
    font-weight: 600;
    margin-top: 1.5em;
    margin-bottom: 0.6em;
}


.rules-details ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 1.2em;
}

.rules-details ul li {
    margin-bottom: 0.8em;
    padding-left: 25px;
    position: relative;
    font-size: 1rem;
}

.rules-details ul li::before {
    content: '▹';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
    font-size: 1.2em;
    line-height: 1.7;
}

@media (max-width: 992px) {
    .rules-container {
        padding: 30px 35px;
    }
    .rules-header h1 {
        font-size: 2.4rem;
    }
}


@media (max-width: 768px) {
    body {
        padding: 20px 10px;
    }
    .rules-container {
        padding: 25px;
        margin: 10px;
    }
    .rules-header h1 {
        font-size: 2rem;
    }
    .back-to-home {
        position: static;
        display: block;
        margin: 0 auto 25px auto;
        width: fit-content;
    }
    .rules-category summary {
        font-size: 1.2rem;
        padding: 18px 20px;
    }
    .rules-details {
        padding: 0 20px;
    }
    .rules-category[open] .rules-details {
        padding: 20px;
    }
    .rules-details p, .rules-details ul li {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 15px 5px;
        line-height: 1.7;
    }
    .rules-container {
        padding: 20px 15px;
    }
    .rules-header h1 {
        font-size: 1.8rem;
    }
    #searchInput {
        padding: 12px 40px 12px 20px;
        font-size: 0.95rem;
    }
    .search-icon {
        font-size: 1.4rem;
        right: 15px;
    }
    .rules-category summary {
        font-size: 1.1rem;
        padding: 15px;
    }
    .rules-category summary::after {
        font-size: 1.6rem;
    }
     .rules-details {
        padding: 0 15px;
    }
    .rules-category[open] .rules-details {
        padding: 15px;
    }
}

.highlight {
    background-color: rgba(var(--rgb-primary), 0.35);
    color: var(--light-text);
    padding: 0.15em 0.3em;
    border-radius: 4px;
    box-shadow: 0 0 8px rgba(var(--rgb-primary), 0.2);
    font-weight: 600;
}