:root {
    --primary-color: #39FF14; /* Neon Green */
    --secondary-color: #00FFFF; /* Aqua/Cyan */
    --background-color: #1a1a2e; /* Very dark blue/purple */
    --card-background: rgba(22, 33, 62, 0.7); /* Semi-transparent dark blue */
    --text-color: #E0E0E0; /* Off-white */
    --border-color: #00FFFF; /* Aqua for general borders and glow */
    --success-color: #39FF14;
    --warning-color: #FFD700; /* Gold */
    --error-color: #FF4500; /* OrangeRed */
    --input-background: #0d1222; /* Darker input background */
    --button-bg-light: #2c3e50; /* Slightly lighter dark for buttons */
    --button-hover-glow: #00FFFF;
}

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start; /* Align to top, for scrollable content */
    min-height: 100vh;
    box-sizing: border-box;
    flex-direction: column; /* Allow content to stack */
    align-items: center; /* Center items horizontally */
    overflow-y: auto; /* Enable scrolling for long content */
}

.container {
    background-color: var(--card-background);
    border-radius: 10px;
    box-shadow: 0 0 5px var(--border-color), 0 0 15px var(--border-color); /* Neon glow */
    padding: 30px;
    width: 100%;
    max-width: 600px;
    box-sizing: border-box;
    margin-bottom: 20px; /* Space between panels if they stack */
    border: 1px solid var(--border-color); /* Subtle border for definition */
    position: relative; /* For positioning help button relative to container */
}

header {
    text-align: center;
    margin-bottom: 30px;
    width: 100%; /* Ensure header takes full width */
    position: relative; /* Make header relative for button positioning */
}

h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
    text-shadow: 0 0 5px var(--primary-color); /* Neon text glow */
}

h2 {
    color: var(--secondary-color);
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    text-shadow: 0 0 3px var(--secondary-color); /* Neon text glow */
}

h3 {
    color: var(--secondary-color);
    margin-top: 15px;
    margin-bottom: 10px;
    text-shadow: 0 0 3px var(--secondary-color);
}

#auth-section, #login-register-form {
    display: flex;
    flex-direction: column;
    gap: 15px; /* Increased gap for better spacing */
    width: 100%;
}

input[type="text"],
input[type="password"] {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
    background-color: var(--input-background);
    color: var(--text-color);
    transition: box-shadow 0.3s ease;
}

input[type="text"]:focus,
input[type="password"]:focus {
    outline: none;
    box-shadow: 0 0 8px var(--border-color); /* Input glow on focus */
}

button {
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--button-bg-light); /* Darker base for buttons */
    color: var(--text-color);
    box-shadow: 0 0 3px rgba(0, 0, 0, 0.5); /* Subtle shadow for depth */
}

button:hover {
    background-color: var(--secondary-color); /* General hover effect */
    box-shadow: 0 0 8px var(--button-hover-glow), 0 0 15px var(--button-hover-glow); /* Stronger glow on hover */
    color: var(--background-color); /* Text color contrast on hover */
}

button#login-btn,
button#register-btn {
    background-color: var(--secondary-color);
    color: var(--background-color);
}

button#login-btn:hover,
button#register-btn:hover {
    background-color: var(--secondary-color);
    box-shadow: 0 0 8px var(--secondary-color), 0 0 15px var(--secondary-color);
}

/* Removed continue-btn styling */

button#logout-btn {
    background-color: var(--error-color);
    color: var(--background-color);
    align-self: flex-end;
    width: auto;
    margin-bottom: 15px;
}

button#logout-btn:hover {
    background-color: var(--error-color);
    box-shadow: 0 0 8px var(--error-color), 0 0 15px var(--error-color);
}

button#contribute-single-btn,
button#copy-key-btn,
button#copy-community-key-btn {
    background-color: var(--primary-color);
    color: var(--background-color);
}

button#contribute-single-btn:hover,
button#copy-key-btn:hover,
button#copy-community-key-btn:hover {
    background-color: var(--primary-color);
    box-shadow: 0 0 8px var(--primary-color), 0 0 15px var(--primary-color);
}

.panel {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 0 5px var(--border-color), 0 0 15px var(--border-color); /* Neon glow */
}

#progress-bar-container {
    width: 100%;
    background-color: #2b3a5b; /* Darker shade for empty part */
    border-radius: 5px;
    overflow: hidden;
    height: 25px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color); /* Border for clarity */
}

#progress-bar-fill {
    height: 100%;
    width: 0%;
    background-color: var(--primary-color);
    border-radius: 5px;
    transition: width 0.5s ease-in-out;
    box-shadow: 0 0 5px var(--primary-color); /* Glow on the fill */
}

#community-key-info, #my-contributions-list {
    margin-top: 15px;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

#community-key-value {
    font-weight: bold;
    color: var(--secondary-color);
    text-shadow: 0 0 3px var(--secondary-color);
}

#active-key-value {
    font-weight: bold;
    color: var(--primary-color);
    text-shadow: 0 0 3px var(--primary-color);
    word-break: break-all; /* Allow long keys to wrap */
}

.contribution-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px dashed rgba(0, 255, 255, 0.5); /* Lighter dashed border using explicit RGB */
}

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

.contribution-options {
    display: flex;
    flex-direction: column;
    gap: 15px; /* Increased gap */
    margin-top: 20px;
}

/* Country Selector Styles */
.country-selector {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 10px;
}

.country-selector label {
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 0.95rem;
    text-shadow: 0 0 2px var(--secondary-color);
}

.country-selector select,
select#country-select {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
    background-color: var(--input-background);
    color: var(--text-color);
    transition: box-shadow 0.3s ease;
    cursor: pointer;
}

.country-selector select:focus,
select#country-select:focus {
    outline: none;
    box-shadow: 0 0 8px var(--border-color); /* Glow on focus */
}

.country-selector select:hover,
select#country-select:hover {
    box-shadow: 0 0 5px var(--border-color); /* Subtle glow on hover */
}

/* Product Card Styles */
.product-card {
    background-color: var(--input-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 0 5px rgba(0, 255, 255, 0.3);
}

.product-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 10px var(--border-color), 0 0 20px var(--border-color);
}

.product-card h4 {
    color: var(--primary-color);
    margin: 0;
    font-size: 1.2rem;
    text-shadow: 0 0 3px var(--primary-color);
}

.product-description {
    color: var(--text-color);
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.4;
}

.product-price {
    color: var(--secondary-color);
    font-size: 1.5rem;
    font-weight: bold;
    margin: 5px 0;
    text-shadow: 0 0 3px var(--secondary-color);
}

.buy-now-btn {
    background-color: var(--primary-color);
    color: var(--background-color);
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.buy-now-btn:hover {
    background-color: var(--primary-color);
    box-shadow: 0 0 8px var(--primary-color), 0 0 15px var(--primary-color);
    transform: scale(1.05);
}

#products-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#products-list p {
    text-align: center;
    color: var(--text-color);
    padding: 20px;
}

#products-list p.error {
    color: var(--error-color);
    text-shadow: 0 0 3px var(--error-color);
}

.hidden {
    display: none !important;
}

.message-area {
    margin-top: 20px;
    padding: 10px;
    border-radius: 5px;
    font-weight: bold;
    text-align: center;
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
}

.message-area.success {
    background-color: rgba(57, 255, 20, 0.2); /* Semi-transparent neon green */
    color: var(--success-color);
    border: 1px solid var(--success-color);
    text-shadow: 0 0 3px var(--success-color);
}

.message-area.error {
    background-color: rgba(255, 69, 0, 0.2); /* Semi-transparent neon red */
    color: var(--error-color);
    border: 1px solid var(--error-color);
    text-shadow: 0 0 3px var(--error-color);
}

.message-area.warning {
    background-color: rgba(255, 215, 0, 0.2); /* Semi-transparent neon gold */
    color: var(--warning-color);
    border: 1px solid var(--warning-color);
    text-shadow: 0 0 3px var(--warning-color);
}

/* --- Header Buttons --- */
.top-left-buttons {
    position: absolute;
    top: 15px;
    left: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-start;
}

.top-right-buttons {
    position: absolute;
    top: 15px;
    right: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.header-button {
    padding: 8px 15px;
    font-size: 0.85rem;
    background-color: var(--secondary-color);
    color: var(--background-color);
    box-shadow: 0 0 5px var(--secondary-color);
    transition: all 0.3s ease;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.header-button:hover {
    background-color: var(--primary-color);
    box-shadow: 0 0 8px var(--primary-color), 0 0 15px var(--primary-color);
    color: var(--background-color);
}


/* --- Modal Styles --- */
.modal {
    display: none; /* Hidden by default; JS will change this to flex */
    position: fixed; /* Stay in place */
    z-index: 100; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0,0,0,0.8); /* Black w/ opacity */
    backdrop-filter: blur(5px); /* Frosted glass effect */
    -webkit-backdrop-filter: blur(5px); /* Safari support */
    display: flex; /* Use flexbox for centering */
    align-items: center; /* Center vertically */
    justify-content: center; /* Center horizontally */
}

.modal-content {
    background-color: var(--card-background);
    margin: auto;
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    width: 90%; /* Adjust width for responsiveness */
    max-width: 700px; /* Max width for larger screens */
    box-shadow: 0 0 10px var(--border-color), 0 0 25px var(--border-color); /* Neon glow */
    position: relative;
    color: var(--text-color);
    max-height: 90vh; /* Limit height to enable scrolling for long content */
    overflow-y: auto; /* Enable scrolling within the modal content */
}

.modal-content h2 {
    color: var(--primary-color);
    border-bottom: 1px solid var(--primary-color);
    padding-bottom: 10px;
    margin-top: 0;
    text-shadow: 0 0 3px var(--primary-color);
}

.modal-content ul {
    list-style: none; /* Remove default bullet points */
    padding: 0;
    margin: 20px 0;
}

.modal-content li {
    margin-bottom: 15px;
    padding-left: 20px;
    position: relative;
    line-height: 1.5;
}

.modal-content li::before {
    content: '•'; /* Custom bullet point */
    color: var(--secondary-color); /* Color for the bullet */
    font-size: 1.2em;
    position: absolute;
    left: 0;
    top: 0;
}

.modal-content p {
    text-align: center;
    margin-top: 30px;
    font-style: italic;
    color: var(--secondary-color);
}


.close-button {
    color: var(--error-color);
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 30px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close-button:hover,
.close-button:focus {
    color: var(--primary-color);
    text-decoration: none;
    cursor: pointer;
}


/* --- Responsive Design --- */

@media screen and (max-width: 768px) {
    body {
        padding: 15px;
    }

    .container {
        padding: 25px;
        max-width: 95%; /* Adjust max width for tablets */
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    button {
        padding: 10px 15px;
        font-size: 0.95rem;
    }

    .contribution-options {
        gap: 10px; /* Reduce gap on smaller screens */
        flex-direction: column; /* Stack buttons vertically on smaller screens */
    }
    .contribution-options button {
        width: 100%; /* Full width buttons */
    }

    .top-left-buttons, .top-right-buttons {
        top: 10px;
        gap: 8px; /* Slightly smaller gap */
    }
    .top-left-buttons {
        left: 10px;
    }
    .top-right-buttons {
        right: 10px;
    }

    .header-button {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .modal-content {
        padding: 20px;
        width: 95%;
        max-height: 95vh;
    }

    .close-button {
        font-size: 25px;
        top: 5px;
        right: 15px;
    }
}

@media screen and (max-width: 480px) {
    body {
        padding: 10px;
        align-items: stretch; /* Stretch body items to fill width on very small screens */
    }

    .container {
        padding: 20px;
        border-radius: 5px; /* Slightly less rounded corners */
        box-shadow: 0 0 3px var(--border-color), 0 0 10px var(--border-color); /* Slightly less intense glow */
    }

    header {
        margin-bottom: 20px;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.2rem;
        padding-bottom: 8px;
    }

    input[type="text"],
    input[type="password"] {
        padding: 10px;
        font-size: 0.9rem;
    }

    button {
        font-size: 0.9rem;
        padding: 10px;
    }

    #logout-btn {
        width: 100%; /* Logout button also full width */
        align-self: center; /* Center it */
        margin-top: 10px;
    }

    .message-area {
        padding: 8px;
        font-size: 0.9rem;
    }

    .top-left-buttons, .top-right-buttons {
        top: 5px;
        gap: 5px; /* Even smaller gap */
        flex-direction: column; /* Stack buttons vertically */
    }
    .top-left-buttons {
        left: 5px;
        align-items: flex-start;
    }
    .top-right-buttons {
        right: 5px;
        align-items: flex-end;
    }

    .header-button {
        padding: 5px 10px;
        font-size: 0.75rem;
    }

    .modal-content {
        padding: 15px;
    }
    .close-button {
        font-size: 20px;
        top: 5px;
        right: 10px;
    }
}