:root {
    --text-color: #333;
    --background-color: #f0f0f0;
    --light-section-bg: #e0e0e0;
    --header-bg: #0056b3;
    --header-text: white;
    --header-link-hover: #abcdef;
    --hero-overlay: rgba(0, 0, 0, 0.5);
    --btn-join-bg: #ff9800;
    --btn-join-hover: #f57c00;
    --btn-store-bg: #28a745;
    --btn-store-hover: #218838;
    --section-heading-color: #0056b3;
    --feature-item-bg: white;
    --feature-item-shadow: rgba(0, 0, 0, 0.1);
    --list-item-bg: white;
    --list-item-border: #0056b3;
    --rule-note-color: #555;
    --rule-note-link: #0056b3;
    --footer-bg: #333;
    --footer-text: white;
    --footer-link-hover: #abcdef;
    --faq-item-bg: white;
}

body.dark-mode {
    --text-color: #e0e0e0;
    --background-color: #1a1a1a;
    --light-section-bg: #2a2a2a;
    --header-bg: #003366;
    --header-text: #abcdef;
    --header-link-hover: white;
    --hero-overlay: rgba(0, 0, 0, 0.7);
    --btn-join-bg: #cc7a00;
    --btn-join-hover: #b36b00;
    --btn-store-bg: #1e7e34;
    --btn-store-hover: #155d27;
    --section-heading-color: #abcdef;
    --feature-item-bg: #3a3a3a;
    --feature-item-shadow: rgba(0, 0, 0, 0.3);
    --list-item-bg: #3a3a3a;
    --list-item-border: #003366;
    --rule-note-color: #ccc;
    --rule-note-link: #abcdef;
    --footer-bg: #222;
    --footer-text: #ccc;
    --footer-link-hover: #abcdef;
    --faq-item-bg: #3a3a3a;
}

body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding-top: 5rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s ease, color 0.3s ease;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-direction: column;
    text-align: center;
}

header h1 {
    margin: 0.5rem 0;
    font-size: 1.8rem;
}

header nav ul {
    list-style: none;
    padding: 0;
    margin: 0.5rem 0 0 0;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

header nav ul li {
    display: inline;
}

header nav ul li a {
    color: var(--header-text);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

header nav ul li a:hover {
    color: var(--header-link-hover);
}

.theme-toggle-button {
    background: none;
    border: none;
    color: var(--header-text);
    font-size: 1rem;
    cursor: pointer;
    padding: 0.5rem 0;
    margin-left: 10px;
    font-weight: 600;
    transition: color 0.3s ease;
}

.theme-toggle-button:hover {
     color: var(--header-link-hover);
}

.btn-store {
     background-color: var(--btn-store-bg);
     color: white !important;
     padding: 0.5rem 1rem;
     border-radius: 5px;
     transition: background-color 0.3s ease;
     font-weight: 600;
     text-decoration: none;
     display: inline-block;
     margin-left: 10px;
}

.btn-store:hover {
     background-color: var(--btn-store-hover);
}

.hero {
    background: url('hero-background.png') no-repeat center center/cover;
    color: white;
    text-align: center;
    padding: 8rem 1rem 4rem 1rem;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--hero-overlay);
    z-index: 1;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero-logo {
    width: 100px;
    height: auto;
    margin-bottom: 1rem;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.btn-join {
    display: inline-block;
    background-color: var(--btn-join-bg);
    color: white;
    padding: 0.8rem 2rem;
    text-decoration: none;
    font-size: 1.2rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
    font-weight: 600;
     margin-bottom: 1rem;
}

.btn-join:hover {
    background-color: var(--btn-join-hover);
}

.btn-store-hero {
     display: inline-block;
    background-color: var(--btn-store-bg);
    color: white;
    padding: 0.8rem 2rem;
    text-decoration: none;
    font-size: 1.2rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
    font-weight: 600;
}

.btn-store-hero:hover {
    background-color: var(--btn-store-hover);
}

.hero-small {
    background: url('hero-background.png') no-repeat center center/cover;
    color: white;
    text-align: center;
    padding: 6rem 1rem 3rem 1rem;
    position: relative;
     margin-top: -5rem;
}

.hero-small::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--hero-overlay);
    z-index: 1;
}

.hero-small .container {
    position: relative;
    z-index: 2;
}

.hero-logo-small {
    width: 80px;
    height: auto;
    margin-bottom: 0.8rem;
}

.hero-small h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.hero-small p {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.section {
    padding: 3rem 1rem;
    text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.light-section {
    background-color: var(--light-section-bg);
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--section-heading-color);
    transition: color 0.3s ease;
}

.section h3 {
    color: var(--section-heading-color);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
     transition: color 0.3s ease;
}

.section ul {
    list-style: none;
    padding: 0;
    max-width: 700px;
    margin: 1.5rem auto;
    text-align: left;
}

.section li {
    background-color: var(--list-item-bg);
    padding: 0.8rem 1.5rem;
    margin-bottom: 0.8rem;
    border-left: 4px solid var(--list-item-border);
    border-radius: 4px;
    font-size: 1rem;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.feature-item {
    background-color: var(--feature-item-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--feature-item-shadow);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.feature-item img {
    width: 60px;
    height: auto;
    margin-bottom: 1rem;
}

.feature-item h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--section-heading-color);
    transition: color 0.3s ease;
}

.feature-item p {
    font-size: 1rem;
    color: var(--text-color);
}

#rules ul {
    list-style: none;
    padding: 0;
    max-width: 600px;
    margin: 1.5rem auto;
    text-align: left;
}

#rules li {
    background-color: var(--list-item-bg);
    padding: 0.8rem 1.5rem;
    margin-bottom: 0.8rem;
    border-left: 4px solid var(--list-item-border);
    border-radius: 4px;
    font-size: 1rem;
     transition: background-color 0.3s ease, border-color 0.3s ease;
}

.rule-note {
    font-size: 0.9rem;
    color: var(--rule-note-color);
    margin-top: 1.5rem;
    transition: color 0.3s ease;
}

.rule-note a {
    color: var(--rule-note-link);
    text-decoration: none;
    transition: color 0.3s ease;
}

.rule-note a:hover {
    text-decoration: underline;
}

.faq-list {
    max-width: 800px;
    margin: 1.5rem auto;
    text-align: left;
}

.faq-item {
     background-color: var(--faq-item-bg);
     padding: 1rem 1.5rem;
     margin-bottom: 1rem;
     border-radius: 8px;
     box-shadow: 0 1px 3px var(--feature-item-shadow);
      transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    color: var(--section-heading-color);
    transition: color 0.3s ease;
}

.faq-item p {
    margin: 0;
    font-size: 1rem;
    color: var(--text-color);
}

.admin-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--rule-note-color);
    text-align: center;
}

.admin-section h3 {
    margin-bottom: 1rem;
     color: var(--section-heading-color);
      transition: color 0.3s ease;
}

.admin-section button {
    background-color: var(--btn-join-bg);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.3s ease;
    margin-bottom: 1.5rem;
}

.admin-section button:hover {
    background-color: var(--btn-join-hover);
}

.admin-section form {
    max-width: 500px;
    margin: 0 auto;
    background-color: var(--list-item-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--feature-item-shadow);
    text-align: left;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.admin-section form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
     transition: color 0.3s ease;
}

.admin-section form input[type="email"],
.admin-section form input[type="password"],
.admin-section form input[type="text"],
.admin-section form textarea {
    width: calc(100% - 20px);
    padding: 10px;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.admin-section form textarea {
    resize: vertical;
}

.admin-section form button[type="submit"] {
    display: block;
    width: 100%;
    padding: 0.8rem;
     background-color: var(--btn-store-bg);
     color: white;
     border: none;
     border-radius: 5px;
     cursor: pointer;
     font-size: 1rem;
     font-weight: 600;
     transition: background-color 0.3s ease;
}

.admin-section form button[type="submit"]:hover {
    background-color: var(--btn-store-hover);
}

#login-message {
    color: red;
    text-align: center;
    margin-top: 1rem;
}

#announcement-list {
    text-align: left;
    max-width: 800px;
    margin: 1.5rem auto;
}

.announcement-item {
    background-color: var(--list-item-bg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--list-item-border);
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--feature-item-shadow);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.announcement-item h4 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
    color: var(--section-heading-color);
     transition: color 0.3s ease;
}

.announcement-item p {
    margin-bottom: 0.8rem;
    font-size: 1rem;
    color: var(--text-color);
}

.announcement-item .date {
    font-size: 0.8rem;
    color: var(--rule-note-color);
     transition: color 0.3s ease;
}

@media (min-width: 768px) {
    header .container {
        flex-direction: row;
    }

    header h1 {
        margin: 0;
        font-size: 2rem;
    }

     header nav ul {
        margin: 0;
    }

    .hero {
        padding: 10rem 1rem 6rem 1rem;
        margin-top: 0;
    }

     .hero h2 {
        font-size: 3rem;
    }

    .hero p {
        font-size: 1.2rem;
    }

    .section {
        padding: 4rem 1rem;
    }

     .section h2 {
        font-size: 2.5rem;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

     footer .container {
        flex-direction: row;
        justify-content: space-between;
    }
}

footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 2rem 1rem;
    text-align: center;
    font-size: 0.9rem;
     transition: background-color 0.3s ease, color 0.3s ease;
}

footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

footer p {
    margin: 0;
}

.social-links a {
    color: var(--footer-text);
    text-decoration: none;
    margin: 0 0.8rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--footer-link-hover);
}