:root {
    --primary-color: #BB86FC;
    --secondary-color: #03DAC6;
    --background-color: #121212;
    --surface-color: #1E1E1E;
    --error-color: #CF6679;
    --on-primary-color: #000000;
    --on-secondary-color: #000000;
    --on-background-color: #FFFFFF;
    --on-surface-color: #FFFFFF;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--on-background-color);
    text-align: center;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

/* Header for Landing Page */
header {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lang-switch {
    font-size: 0.9rem;
}

.lang-switch a {
    color: var(--secondary-color);
    text-decoration: none;
    margin-left: 10px;
}

.lang-switch a:hover {
    text-decoration: underline;
}

header h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin: 0;
}

/* Hero Section for Landing Page */
.hero {
    padding: 80px 20px;
    background-color: var(--surface-color);
    border-radius: 8px;
    margin-bottom: 40px;
}

.hero h2 {
    font-size: 2.5rem;
    margin-top: 0;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    color: var(--on-surface-color);
    opacity: 0.8;
}

/* CTA Button for Landing Page */
.cta-button {
    display: inline-block;
    padding: 15px 30px;
    background-color: var(--primary-color);
    color: var(--on-primary-color);
    font-size: 1.2rem;
    font-weight: bold;
    text-decoration: none;
    border-radius: 25px;
    margin-top: 20px;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #a86add;
}

/* Features Section for Landing Page */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.feature-card {
    background-color: var(--surface-color);
    padding: 30px;
    border-radius: 8px;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-top: 0;
}

/* Footer for Landing Page */
footer {
    padding: 20px 0;
    margin-top: 40px;
    border-top: 1px solid var(--surface-color);
    font-size: 0.9rem;
    color: var(--on-surface-color);
    opacity: 0.6;
}

/* Auth Page Specific Styles */
.auth-container {
    max-width: 400px;
    padding: 40px;
    background-color: var(--surface-color);
    border-radius: 8px;
    margin-top: 50px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.auth-forms {
    margin-top: 30px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.auth-form h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.auth-form input[type="email"],
.auth-form input[type="password"] {
    padding: 12px;
    border: 1px solid #555;
    border-radius: 5px;
    background-color: #333;
    color: var(--on-surface-color);
    font-size: 1rem;
}

.auth-button {
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.auth-button.primary {
    background-color: var(--primary-color);
    color: var(--on-primary-color);
}

.auth-button.primary:hover {
    background-color: #a86add;
}

.auth-button.secondary {
    background-color: var(--secondary-color);
    color: var(--on-secondary-color);
}

.auth-button.secondary:hover {
    background-color: #02a093;
}

.auth-button.google {
    background-color: #DB4437; /* Google red */
    color: #FFFFFF;
    margin-top: 20px;
}

.auth-button.google:hover {
    background-color: #c0362a;
}

.auth-toggle {
    margin-top: 20px;
    font-size: 0.9rem;
}

.auth-toggle a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: bold;
}

.auth-toggle a:hover {
    text-decoration: underline;
}

/* Hide signup form by default */
#signup-form {
    display: none;
}


/* Dashboard Specific Styles */
.dashboard-container {
    text-align: left;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--surface-color);
    margin-bottom: 40px;
}

.app-title {
    color: var(--primary-color);
    margin: 0;
    font-size: 2rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info span {
    font-size: 1.1rem;
    font-weight: bold;
}

.my-groups-section {
    margin-bottom: 40px;
}

.my-groups-section h2 {
    font-size: 1.8rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.group-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.group-card {
    background-color: var(--surface-color);
    padding: 20px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--on-surface-color);
    transition: transform 0.2s ease-in-out;
    display: flex;
    flex-direction: column;
    align-items: flex-start; /* Align text to start within card */
}

.group-card:hover {
    transform: translateY(-5px);
}

.group-card h3 {
    margin-top: 0;
    color: var(--primary-color);
    font-size: 1.4rem;
}

.group-card p {
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.group-card .progress {
    margin-top: 10px;
    font-weight: bold;
    color: var(--secondary-color);
}

.no-groups-message {
    grid-column: 1 / -1; /* Span across all columns */
    font-size: 1.1rem;
    color: var(--on-surface-color);
    opacity: 0.7;
    text-align: center;
    padding: 30px;
    background-color: #282828;
    border-radius: 8px;
}

.create-new-battle-section {
    text-align: center;
    margin-top: 60px;
}

/* Marketplace Specific Styles */
.market-section {
    margin-bottom: 60px;
}

.market-section h2 {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 30px;
    text-align: left;
}

.routine-price {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--secondary-color);
    margin-top: 10px;
}

.buy-button {
    margin-top: auto; /* Push button to the bottom of the card */
    width: 100%;
}

.small {
    padding: 8px 15px;
    font-size: 0.9rem;
}

/* Create Group Specific Styles */
.create-group-container {
    max-width: 600px;
    text-align: left;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: center; /* Center horizontally */
    margin-bottom: 30px;
    position: relative; /* For absolute positioning of back button */
    min-height: 50px;
}

.page-header h1 {
    margin: 0;
    font-size: 2rem;
    color: var(--primary-color);
    text-align: center;
}

.back-button {
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: bold;
    font-size: 1rem;
}

.group-form {
    background-color: var(--surface-color);
    padding: 40px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-bottom: 40px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--on-surface-color);
}

.form-group input[type="text"],
.form-group select {
    width: calc(100% - 24px); /* Account for padding */
    padding: 12px;
    border: 1px solid #555;
    border-radius: 5px;
    background-color: #333;
    color: var(--on-surface-color);
    font-size: 1rem;
    -webkit-appearance: none; /* Remove default styling for selects */
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white' width='18px' height='18px'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3Cpath d='M0 0h24v24H0z' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 18px;
}

.radio-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.radio-group input[type="radio"] {
    display: none;
}

.radio-group label {
    background-color: #333;
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
    font-weight: normal;
    font-size: 1rem;
    border: 1px solid #555;
}

.radio-group input[type="radio"]:checked + label {
    background-color: var(--secondary-color);
    color: var(--on-secondary-color);
    border-color: var(--secondary-color);
}

.primary-button {
    background-color: var(--primary-color);
    color: var(--on-primary-color);
    padding: 15px 30px;
    font-size: 1.2rem;
    border-radius: 25px;
    cursor: pointer;
    transition: background-color 0.3s;
    border: none;
}

.primary-button:hover {
    background-color: #a86add;
}

.secondary-button {
    background-color: var(--surface-color);
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
    padding: 10px 20px;
    font-size: 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

.secondary-button:hover {
    background-color: var(--secondary-color);
    color: var(--on-secondary-color);
}

.invite-link-section {
    background-color: var(--surface-color);
    padding: 30px;
    border-radius: 8px;
    margin-top: 40px;
}

.invite-link-section h2 {
    color: var(--secondary-color);
    margin-top: 0;
}

.invite-code-display {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.invite-code-display input {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #555;
    border-radius: 5px;
    background-color: #333;
    color: var(--on-surface-color);
    font-size: 1rem;
}

.invite-code-display button {
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    background-color: var(--primary-color);
    color: var(--on-primary-color);
    border: none;
}

.invite-code-display button:hover {
    background-color: #a86add;
}

.back-to-dashboard-button {
    margin-top: 30px;
    text-decoration: none;
}


/* Group Feed Specific Styles */
.group-feed-container {
    text-align: left;
}

.group-feed-container .page-header {
    margin-bottom: 40px;
}

.certification-upload-section {
    background-color: var(--surface-color);
    padding: 30px;
    border-radius: 8px;
    margin-bottom: 40px;
    text-align: center; /* Center the button and form */
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
    text-align: left;
}

.upload-form h3 {
    color: var(--secondary-color);
    margin-top: 0;
    font-size: 1.5rem;
}

.upload-form input[type="file"] {
    background-color: #333;
    border: 1px solid #555;
    border-radius: 5px;
    padding: 10px;
    color: var(--on-surface-color);
}

.upload-form textarea {
    padding: 10px;
    border: 1px solid #555;
    border-radius: 5px;
    background-color: #333;
    color: var(--on-surface-color);
    font-size: 1rem;
    resize: vertical;
}

.upload-form .cta-button {
    margin-top: 10px;
}

.group-content {
    display: grid;
    grid-template-columns: 2fr 1fr; /* Timeline takes 2/3, Ranking 1/3 */
    gap: 40px;
}

.timeline-section h2, .ranking-section h2 {
    color: var(--secondary-color);
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.timeline-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.certification-card {
    background-color: var(--surface-color);
    padding: 20px;
    border-radius: 8px;
    text-align: left;
}

.certification-card .user-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.certification-card .user-meta img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    background-color: #555;
}

.certification-card .user-meta .nickname {
    font-weight: bold;
    color: var(--primary-color);
}

.certification-card .timestamp {
    font-size: 0.8rem;
    color: var(--on-surface-color);
    opacity: 0.7;
}

.certification-card img.cert-image {
    max-width: 100%;
    border-radius: 8px;
    margin-top: 15px;
    margin-bottom: 10px;
}

.certification-card p.comment {
    font-size: 1rem;
    line-height: 1.5;
}

.certification-card .reactions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    padding-top: 10px;
    border-top: 1px solid #282828;
}

.reaction-button {
    background: none;
    border: none;
    color: var(--on-surface-color);
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.reaction-button:hover {
    opacity: 1;
}

.reaction-button span {
    margin-left: 5px;
    font-size: 0.9rem;
}

.ranking-list {
    background-color: var(--surface-color);
    padding: 20px;
    border-radius: 8px;
}

.ranking-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #282828;
}

.ranking-item:last-child {
    border-bottom: none;
}

.ranking-item .rank {
    font-weight: bold;
    color: var(--secondary-color);
    width: 30px;
}

.ranking-item .nickname {
    flex-grow: 1;
    font-weight: bold;
}

.ranking-item .count {
    color: var(--primary-color);
    font-weight: bold;
}

.no-certifications-message, .no-ranking-message {
    font-size: 1.1rem;
    color: var(--on-surface-color);
    opacity: 0.7;
    text-align: center;
    padding: 30px;
    background-color: #282828;
    border-radius: 8px;
    grid-column: 1 / -1; /* Span across all columns */
}

/* Media Queries */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 2rem;
    }
    .hero p {
        font-size: 1rem;
    }
    .cta-button {
        padding: 12px 25px;
        font-size: 1rem;
    }
    .auth-container, .create-group-container {
        margin-top: 20px;
        padding: 20px;
    }
    .dashboard-header {
        flex-direction: column;
        gap: 15px;
    }
    .user-info {
        flex-direction: column;
        gap: 10px;
    }
    .app-title {
        font-size: 1.8rem;
    }
    .my-groups-section h2 {
        font-size: 1.5rem;
    }
    .group-form {
        padding: 20px;
    }
    .page-header {
        flex-direction: column;
        gap: 10px;
    }
    .back-button {
        margin-right: 0;
    }

    .group-content {
        grid-template-columns: 1fr; /* Stack columns on small screens */
    }
    .ranking-section {
        margin-top: 40px;
    }
}