/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;

    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #868e96;

    --border-color: #dee2e6;
    --border-radius: 8px;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.15);

    --message-bubble-mine: #007bff;
    --message-bubble-others: #e9ecef;
    --message-text-mine: #ffffff;
    --message-text-others: #212529;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;

    --border-color: #444444;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.4);

    --message-bubble-others: #3d3d3d;
    --message-text-others: #ffffff;
}

/* Auto Dark Theme */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #1a1a1a;
        --bg-secondary: #2d2d2d;
        --bg-tertiary: #3d3d3d;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --text-muted: #808080;

        --border-color: #444444;
        --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.4);

        --message-bubble-others: #3d3d3d;
        --message-text-others: #ffffff;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #000000;
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

/* Chat Container */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
}

/* Header */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    box-shadow: 0px -20px 50px #4346ff;
    background-color: #000000;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.room-selector {
    background: none;
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.room-selector:hover {
    background-color: var(--bg-tertiary);
}

.room-selector:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.room-selector h1 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.room-selector h1::before {
    content: "#";
    color: var(--text-muted);
}

.share-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.share-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.share-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.online-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
}

.settings-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.settings-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.settings-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Connection Status */
.connection-status {
    background-color: var(--warning-color);
    color: #000;
    text-align: center;
    padding: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.connection-status.connected {
    background-color: var(--success-color);
    color: #fff;
}

.connection-status.error {
    background-color: var(--danger-color);
    color: #fff;
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    background-color: #000000;
    box-shadow: #4346ff96 0px 0px 50px 0px;
}

.welcome-message {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Message Styles */
.message {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
}

.message.mine {
    align-items: flex-end;
}

.message.others {
    align-items: flex-start;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.message.mine .message-header {
    flex-direction: row-reverse;
}

.message-username {
    font-weight: 600;
}

.message-time {
    font-size: 0.75rem;
}

.message-bubble {
    max-width: 70%;
    padding: 0.75rem 1rem;
    border-radius: 18px;
    word-wrap: break-word;
    position: relative;
}

.message.mine .message-bubble {
    background-color: #282f7bb8;
    color: var(--message-text-mine);
    border-bottom-right-radius: 4px;
}

.message.others .message-bubble {
    background-color: #48427b94;
    color: var(--message-text-others);
    border-bottom-left-radius: 4px;
}

.system-message {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-style: italic;
    margin: 0.5rem 0;
}

/* Typing Indicator */
.typing-indicator {
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.875rem;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

/* Input Area */
.input-area {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
    box-shadow: 0px -20px 50px #4346ff;
    background-color: #000000;
}

.input-container {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
}

#message-input {
    flex: 1;
    min-height: 2.5rem;
    max-height: 6rem;
    padding: 0.75rem;
    border-radius: var(--border-radius);
    border: 1px solid #000000;
    background-color: #000000;
    color: var(--text-primary);
    resize: none;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.4;
    transition: border-color 0.2s ease;
}

#message-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
    color: white;
}

#message-input::placeholder {
    color: var(--text-muted);
}

.send-btn {
    padding: 0.75rem;
    background-color: #000000;
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.send-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.send-btn:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 1.5rem 0;
    background: black;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
    background: black;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: #35353545;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.form-group label input[type="checkbox"] {
    margin-right: 0.5rem;
}

.modal-footer {
    padding: 0 1.5rem 1.5rem;
    text-align: right;
    background: black;
}

.btn-primary {
    background-color: #2323238c;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

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

.btn-primary:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Room Selection Styles */
.quick-rooms {
    margin-top: 1.5rem;
}

.quick-rooms h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.room-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.5rem;
}

.room-btn {
    padding: 0.75rem 1rem;
    background-color: #1616168c;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.room-btn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.room-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.share-url-container {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.share-url-container input {
    flex: 1;
}

.btn-copy {
    padding: 0.75rem 1rem;
    background-color: #31313194;
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.2s ease;
    white-space: nowrap;
}

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

.btn-copy:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.form-group small {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .chat-container {
        border-left: none;
        border-right: none;
        height: 100vh;
        height: 100dvh;
        border-radius: 20px;
        /* Dynamic viewport height for mobile */
    }

    .chat-header {
        padding: 0.75rem 1rem;
        position: sticky;
        top: 0;
        z-index: 10;
        backdrop-filter: blur(10px);
        border-top-left-radius: 20px;
        border-top-right-radius: 20px;
        box-shadow: 0px -20px 50px #4346ff;
        background-color: #000000;
    }

    .header-left h1 {
        font-size: 1.25rem;
    }

    .online-count {
        font-size: 0.75rem;
        padding: 0.125rem 0.375rem;
    }

    .messages-container {
        padding: 0.75rem;
        padding-bottom: 1rem;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .message-bubble {
        max-width: 85%;
        font-size: 0.9rem;
        padding: 0.625rem 0.875rem;
    }

    .input-area {
        padding: 0.75rem 1rem;
        border-top: 1px solid var(--border-color);
        position: sticky;
        bottom: 0;
        backdrop-filter: blur(10px);
        border-bottom-left-radius: 20px;
        border-bottom-right-radius: 20px;
        box-shadow: 0px -20px 50px #4346ff;
        background-color: #000000;
    }

    .modal {
        padding: 0.5rem;
    }

    .modal-content {
        max-height: 85vh;
        max-height: 85dvh;
        box-shadow: #ffffff 0px 0px 50px;
        background-color: #121212;
        border-radius: 20px;
    }
}

/* iPhone and small mobile optimization */
@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    .chat-container {
        height: 100vh;
        height: 100dvh;
    }

    .chat-header {
        padding: 0.5rem 1rem;
        min-height: 3.5rem;
    }

    .header-left {
        gap: 0.5rem;
    }

    .header-left h1 {
        font-size: 1.1rem;
    }

    .settings-btn {
        padding: 0.75rem;
        touch-action: manipulation;
    }

    .messages-container {
        padding: 0.5rem;
        flex: 1;
    }

    .message {
        margin-bottom: 0.75rem;
    }

    .message-bubble {
        max-width: 90%;
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        line-height: 1.4;
        border-radius: 16px;
    }

    .message.mine .message-bubble {
        border-bottom-right-radius: 4px;
    }

    .message.others .message-bubble {
        border-bottom-left-radius: 4px;
    }

    .message-header {
        font-size: 0.8rem;
        margin-bottom: 0.375rem;
    }

    .input-area {
        padding: 0.75rem 1rem 1rem;
        background: var(--bg-secondary);
        border-top: 1px solid var(--border-color);
    }

    .input-container {
        gap: 0.5rem;
        align-items: flex-end;
    }

    #message-input {
        font-size: 16px;
        /* Prevents zoom on iOS */
        padding: 0.875rem 1rem;
        border-radius: 20px;
        min-height: 2.75rem;
        resize: none;
        border: 1px solid #000000;
        background-color: #000000;
    }

    .send-btn {
        padding: 0.875rem;
        border-radius: 50%;
        min-width: 2.75rem;
        height: 2.75rem;
        touch-action: manipulation;
        background-color: #000000;
    }

    .typing-indicator {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }

    .welcome-message {
        padding: 1.5rem 1rem;
        font-size: 0.9rem;
    }

    .system-message {
        font-size: 0.8rem;
        margin: 0.375rem 0;
    }

    /* Modal improvements for mobile */
    .modal {
        padding: 1rem;
        align-items: flex-end;
    }

    .modal-content {
        width: 100%;
        max-height: 70vh;
        border-radius: 1rem 1rem 0 0;
        margin: 0;
    }

    .modal-header {
        padding: 1rem 1rem 0.5rem;
        background: black;
    }

    .modal-body {
        padding: 0.5rem 1rem 1rem;
        background: black;
    }

    .form-group input[type="text"] {
        font-size: 16px;
        padding: 0.875rem;
        border-radius: 12px;
    }

    .btn-primary {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        border-radius: 12px;
        touch-action: manipulation;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    }

    .message-bubble {
        border: 2px solid var(--border-color);
    }
}

/* Focus visible for better accessibility */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Touch and mobile optimizations */
@media (hover: none) and (pointer: coarse) {

    /* Touch device specific styles */
    .settings-btn:hover,
    .send-btn:hover,
    .btn-primary:hover,
    .close-btn:hover {
        background-color: inherit;
    }

    .settings-btn:active,
    .send-btn:active,
    .btn-primary:active,
    .close-btn:active {
        transform: scale(0.95);
        transition: transform 0.1s ease;
    }

    /* Hide scrollbars on touch devices */
    .messages-container {
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .messages-container::-webkit-scrollbar {
        display: none;
    }
}

/* Scrollbar for desktop */
@media (hover: hover) and (pointer: fine) {
    .messages-container::-webkit-scrollbar {
        width: 6px;
    }

    .messages-container::-webkit-scrollbar-track {
        background: var(--bg-secondary);
    }

    .messages-container::-webkit-scrollbar-thumb {
        background: var(--text-muted);
        border-radius: 3px;
    }

    .messages-container::-webkit-scrollbar-thumb:hover {
        background: var(--text-secondary);
    }
}

/* Safe area for iPhone notch and home indicator */
@supports (padding: max(0px)) {
    .chat-container {
        padding-top: max(0px, env(safe-area-inset-top));
        padding-bottom: max(0px, env(safe-area-inset-bottom));
    }

    .input-area {
        padding-bottom: max(0.75rem, calc(0.75rem + env(safe-area-inset-bottom)));
    }
}

/* Online Users List */
.users-list {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 300px;
    overflow-y: auto;
}

.users-list li {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.users-list li:last-child {
    border-bottom: none;
}

.users-list li::before {
    content: '';
    display: block;
    width: 8px;
    height: 8px;
    background-color: var(--success-color);
    border-radius: 50%;
}

.users-list li.me {
    font-weight: 600;
    background: #181818a3;
    border-radius: 10px;
}

.users-list li.me::after {
    content: '(You)';
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: normal;
    margin-left: auto;
}

/* Modal Divider */
.modal-divider {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 1.5rem 0;
}

/* Danger Button */
.btn-danger {
    background-color: #0c0c0c;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
    width: 100%;
}

.btn-danger:hover {
    background-color: #0c0c0c;
}

.btn-danger:focus {
    outline: 2px solid #0c0c0c;
    outline-offset: 2px;
    background-color: #0c0c0c;
}

/* Clickable Online Count */
.online-count {
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.online-count:hover {
    background-color: var(--bg-tertiary);
    text-decoration: underline;
}