:root {
    --bg-black: #000000;
    --bg-dark: #0a0a0a;
    --terminal-green: #00ff41;
    --terminal-dim: #008f11;
    --terminal-dark: #003b00;
    --text-main: #00ff41;
    --text-dim: #008f11;
    --sidebar-width: 260px;
    --border-style: 1px solid var(--terminal-dim);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Courier New', Courier, monospace;
    background-color: var(--bg-black);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

/* Scrollbar styling */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-black); }
::-webkit-scrollbar-thumb { background: var(--terminal-dark); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--terminal-dim); }

.app-container {
    display: flex;
    height: 100vh;
    border: var(--border-style);
    box-sizing: border-box;
}

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-dark);
    border-right: var(--border-style);
    display: flex;
    flex-direction: column;
}

.user-info {
    padding: 20px;
    border-bottom: var(--border-style);
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar-circle, .avatar-placeholder {
    width: 35px;
    height: 35px;
    border: 1px solid var(--terminal-green);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--terminal-green);
    background: var(--bg-black);
}

.user-details {
    flex: 1;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.settings-btn {
    cursor: pointer;
    color: var(--terminal-green);
    background: none;
    border: 1px solid var(--terminal-green);
    padding: 2px 5px;
    font-size: 0.7rem;
}

.nav-list {
    flex: 1;
    padding: 15px 0;
    overflow-y: auto;
}

.nav-list a {
    display: block;
    padding: 10px 20px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-list a:hover, .nav-list a.active {
    color: var(--terminal-green);
    background-color: var(--terminal-dark);
    border-left: 3px solid var(--terminal-green);
}

.nav-section {
    margin: 20px 0 10px 0;
    padding: 0 20px;
    font-size: 0.7rem;
    font-weight: bold;
    color: var(--terminal-dim);
    display: flex;
    justify-content: space-between;
    text-transform: uppercase;
}

.nav-section a {
    display: inline;
    padding: 0;
    border: none;
    font-size: 1rem;
}

.logout-btn {
    padding: 15px 20px;
    border-top: var(--border-style);
}

.logout-btn a {
    color: #ff0000;
    text-decoration: none;
    font-size: 0.8rem;
    text-transform: uppercase;
}

/* Chat Area Styles */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-black);
    position: relative;
}

.chat-header {
    height: 60px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    border-bottom: var(--border-style);
    background: var(--bg-dark);
}

.chat-header h3 {
    margin: 0;
    font-size: 1rem;
    color: var(--terminal-green);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.message-list {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.message-item {
    margin-bottom: 15px;
    display: flex;
    gap: 15px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.msg-avatar img {
    width: 35px;
    height: 35px;
    border: 1px solid var(--terminal-dim);
}

.msg-header {
    margin-bottom: 5px;
}

.msg-author {
    font-weight: bold;
    font-size: 0.9rem;
}

.msg-time {
    font-size: 0.7rem;
    color: var(--terminal-dim);
    margin-left: 10px;
}

.msg-text {
    line-height: 1.4;
    word-wrap: break-word;
    color: var(--text-main);
}

.message-input {
    padding: 20px;
    border-top: var(--border-style);
}

.message-input input {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-dark);
    border: 1px solid var(--terminal-dim);
    color: var(--terminal-green);
    font-family: 'Courier New', monospace;
    outline: none;
}

.message-input input:focus {
    border-color: var(--terminal-green);
    box-shadow: 0 0 5px var(--terminal-dark);
}

/* Sliding Settings Panel */
.settings-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 350px;
    height: 100vh;
    background: var(--bg-dark);
    border-left: var(--border-style);
    z-index: 1000;
    transition: right 0.4s cubic-bezier(0.19, 1, 0.22, 1);
    padding: 30px;
    box-sizing: border-box;
    box-shadow: -5px 0 20px rgba(0,0,0,0.8);
}

.settings-panel.open {
    right: 0;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    border-bottom: var(--border-style);
    padding-bottom: 10px;
}

.close-btn {
    cursor: pointer;
    font-size: 1.5rem;
}

/* Form Styles for Settings */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--terminal-dim);
    font-size: 0.75rem;
    text-transform: uppercase;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 10px;
    background: var(--bg-black);
    border: 1px solid var(--terminal-dim);
    color: var(--terminal-green);
    font-family: inherit;
}

.btn {
    width: 100%;
    padding: 12px;
    background: var(--terminal-dark);
    color: var(--terminal-green);
    border: 1px solid var(--terminal-green);
    cursor: pointer;
    text-transform: uppercase;
    font-weight: bold;
    transition: all 0.2s;
}

.btn:hover {
    background: var(--terminal-green);
    color: var(--bg-black);
}

/* Overlay */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 999;
}

.overlay.show {
    display: block;
}