:root {
    --bg-color: #1a252f;
    --text-color: #e0e1dd;
    --card-bg: #2a2a2a;
    --sidebar-bg: #2a2a2a;
    --sidebar-text: #b3d4ff;
    --navbar-bg: #121a22;
    --navbar-text: #e0e1dd;
    --table-bg: #2a2a2a;
    --table-hover-bg: #3a3a3a;
    --accent-color: #4dabf7;
    --accent-hover: #6ec1ff;
    --private-color: #ff4444;
    --motd-bg: #fff3cd;
    --motd-text: #856404;
    --shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    --glow: 0 0 10px rgba(77, 171, 247, 0.5);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
    transition: all 0.3s ease;
    font-family: Arial, sans-serif;
}

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 50%;
    opacity: 0.3;
    animation: float 10s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* Login Page */
.login-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, var(--navbar-bg), var(--bg-color));
    animation: gradient 15s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.login-container h2 {
    margin-bottom: 20px;
    color: var(--sidebar-text);
    text-shadow: var(--glow);
}

.login-container input {
    width: 300px;
    padding: 12px;
    margin: 10px 0;
    border: none;
    border-radius: 6px;
    background-color: var(--table-bg);
    color: var(--text-color);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.login-container input:focus {
    box-shadow: inset 0 0 0 2px var(--accent-color);
    outline: none;
}

.login-container button {
    width: 300px;
    padding: 12px;
    background-color: var(--accent-color);
    color: var(--navbar-text);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 15px;
    transition: background 0.3s, box-shadow 0.3s;
}

.login-container button:hover {
    background-color: var(--accent-hover);
    box-shadow: var(--glow);
}

.toggle-form {
    margin-top: 15px;
    color: var(--text-color);
}

.toggle-form a {
    color: var(--accent-color);
    text-decoration: none;
}

.toggle-form a:hover {
    color: var(--accent-hover);
}

/* Top Nav */
.top-nav {
    background-color: var(--navbar-bg);
    color: var(--navbar-text);
    padding: 15px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(8px);
}

.top-nav .logo {
    font-size: 26px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
    text-shadow: var(--glow);
}

.top-nav .user-info a {
    color: var(--navbar-text);
    text-decoration: none;
    margin-left: 20px;
    transition: color 0.2s, text-shadow 0.2s;
}

.top-nav .user-info a:hover {
    color: var(--accent-hover);
    text-shadow: var(--glow);
}

/* Sidebar */
.sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    height: calc(100vh - 60px);
    position: fixed;
    top: 60px;
    right: 0;
    padding: 25px;
    overflow-y: auto;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.profile-card, .rooms-list, .private-messages {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.profile-card h3, .rooms-list h3, .private-messages h3 {
    font-size: 18px;
    color: var(--sidebar-text);
    margin-bottom: 15px;
    text-shadow: var(--glow);
}

.profile-card p {
    margin: 10px 0;
    font-size: 14px;
}

.profile-card button, .rooms-list button {
    width: 100%;
    padding: 10px;
    background-color: var(--accent-color);
    color: var(--navbar-text);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}

.profile-card button:hover, .rooms-list button:hover {
    background-color: var(--accent-hover);
    box-shadow: var(--glow);
}

.rooms-list ul, .private-messages ul {
    list-style: none;
}

.rooms-list ul li, .private-messages ul li {
    margin: 10px 0;
}

.rooms-list ul li a, .private-messages ul li a {
    text-decoration: none;
    color: var(--sidebar-text);
    font-size: 15px;
    padding: 10px;
    display: block;
    border-radius: 6px;
    transition: background 0.2s, transform 0.2s;
}

.rooms-list ul li a:hover, .private-messages ul li a:hover {
    background-color: var(--table-hover-bg);
    transform: translateX(5px);
}

/* Main Content */
.main-content {
    margin-right: 320px;
    margin-top: 80px;
    padding: 30px;
    perspective: 1200px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    overflow-x: auto;
}

.tab {
    padding: 10px 20px;
    background-color: var(--table-bg);
    color: var(--text-color);
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}

.tab.active {
    background-color: var(--accent-color);
    color: var(--navbar-text);
    box-shadow: var(--glow);
}

.tab.private {
    background-color: var(--private-color);
}

.tab.private.active {
    background-color: var(--private-color);
    opacity: 0.9;
}

/* Chat Windows */
.chat-windows {
    position: relative;
}

.chat-window {
    display: none;
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    max-height: 500px;
    overflow-y: auto;
}

.chat-window.active {
    display: block;
}

.chat-window .motd {
    background-color: var(--motd-bg);
    color: var(--motd-text);
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.chat-window .message {
    margin: 10px 0;
    padding: 10px;
    border-radius: 6px;
    background-color: var(--table-hover-bg);
}

.chat-window .message .sender {
    font-weight: bold;
    color: var(--accent-color);
}

.chat-window .message .timestamp {
    font-size: 12px;
    color: #aaa;
}

.chat-window input {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    border: none;
    border-radius: 6px;
    background-color: var(--table-bg);
    color: var(--text-color);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.chat-window input:focus {
    box-shadow: inset 0 0 0 2px var(--accent-color);
    outline: none;
}

.chat-window button {
    padding: 12px 20px;
    background-color: var(--accent-color);
    color: var(--navbar-text);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 10px;
    transition: background 0.2s, box-shadow 0.2s;
}

.chat-window button:hover {
    background-color: var(--accent-hover);
    box-shadow: var(--glow);
}

.chat-window button.motd-btn {
    background-color: #ffca2c;
    color: #333;
}

.chat-window button.motd-btn:hover {
    background-color: #e0a800;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 20;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--card-bg);
    margin: 10% auto;
    padding: 30px;
    border: none;
    width: 80%;
    max-width: 700px;
    border-radius: 12px;
    box-shadow: var(--shadow), var(--glow);
    transform: scale(0.8);
    transition: transform 0.4s ease;
}

.modal-content.show {
    transform: scale(1);
}

.modal-content h2 {
    color: var(--sidebar-text);
    margin-bottom: 25px;
    text-shadow: var(--glow);
}

.modal-content label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-size: 15px;
}

.modal-content input,
.modal-content textarea,
.modal-content select {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: none;
    border-radius: 6px;
    background-color: var(--table-bg);
    color: var(--text-color);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.modal-content input:focus,
.modal-content textarea:focus,
.modal-content select:focus {
    box-shadow: inset 0 0 0 2px var(--accent-color);
    outline: none;
}

.modal-content .form-row {
    display: flex;
    gap: 20px;
}

.modal-content .form-row div {
    flex: 1;
}

.modal-content button {
    background-color: var(--accent-color);
    color: var(--navbar-text);
    padding: 12px 25px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}

.modal-content button:hover {
    background-color: var(--accent-hover);
    box-shadow: var(--glow);
}

.modal-content button.cancel {
    background-color: #555;
    margin-left: 15px;
}

.modal-content button.cancel:hover {
    background-color: #333;
}

.close {
    color: var(--text-color);
    float: right;
    font-size: 28px;
    font-weight: bold;
    transition: color 0.2s;
}

.close:hover,
.close:focus {
    color: var(--accent-color);
    cursor: pointer;
}

/* Alert Bar */
.alert-bar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    padding: 15px;
    text-align: center;
    z-index: 9;
    display: none;
    transition: transform 0.3s ease-in-out;
    transform: translateY(-100%);
    box-shadow: var(--shadow);
}

.alert-bar.show {
    transform: translateY(0);
}

.alert-bar.success {
    background-color: #00cc66;
    color: white;
    text-shadow: var(--glow);
}

.alert-bar.error {
    background-color: #ff4444;
    color: white;
    text-shadow: var(--glow);
}