* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #0d0d0d;
    color: #e0e0e0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 10px;
}

.dark-theme {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --accent-purple: #8b5cf6;
    --accent-red: #ef4444;
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
}

.container, .form-container, .dashboard, .chat-container {
    width: 100%;
    max-width: 800px;
    margin: auto;
    padding: 20px;
    background-color: var(--bg-primary);
    border-radius: 12px;
    box-shadow: 0 0 30px rgba(139, 92, 246, 0.2);
    border: 1px solid #333;
}

h1, h2, h3 {
    color: var(--accent-purple);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.input-group {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #444;
    transition: all 0.3s;
}

.input-group:focus-within {
    border-color: var(--accent-purple);
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.3);
}

.input-group i {
    color: var(--accent-purple);
    margin-right: 10px;
    font-size: 18px;
}

.input-group input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 16px;
}

input::placeholder {
    color: #666;
}

button {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-red));
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    width: 100%;
    transition: all 0.3s;
    margin-top: 5px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(139, 92, 246, 0.4);
}

.error {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid var(--accent-red);
    color: #fca5a5;
    padding: 10px;
    border-radius: 8px;
    margin: 10px 0;
}

.success {
    background: rgba(34, 197, 94, 0.2);
    border: 1px solid #22c55e;
    color: #86efac;
    padding: 10px;
    border-radius: 8px;
    margin: 10px 0;
}

a {
    color: var(--accent-purple);
    text-decoration: none;
}

a:hover {
    color: var(--accent-red);
}

/* Avatar */
.avatar {
    border-radius: 50%;
    border: 2px solid var(--accent-purple);
    object-fit: cover;
}
.avatar-mini {
    border-radius: 50%;
    width: 30px;
    height: 30px;
    object-fit: cover;
    margin-right: 10px;
}

/* Dashboard */
.dashboard header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #333;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}
.user-info a {
    color: var(--accent-purple);
    font-size: 20px;
}
.user-info a:hover {
    color: var(--accent-red);
}

.search-box form {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 10px;
    border: 1px solid #444;
    margin-bottom: 20px;
}

.search-box i {
    color: var(--accent-purple);
    margin-right: 10px;
}

.search-box input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text-primary);
}

.user-list, .groups-section {
    margin: 20px 0;
}

.user-item, .group-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-secondary);
    padding: 10px;
    border-radius: 8px;
    margin: 5px 0;
    border: 1px solid #333;
    transition: all 0.3s;
}

.user-item:hover, .group-item:hover {
    border-color: var(--accent-purple);
}

.btn-chat {
    background: var(--accent-purple);
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 14px;
}

.btn-chat:hover {
    background: var(--accent-red);
}

.btn-create-group {
    display: inline-block;
    background: var(--accent-purple);
    color: white;
    padding: 10px 15px;
    border-radius: 8px;
    margin: 10px 0;
}

/* Chat */
.chat-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-bottom: 10px;
}

.chat-header .name {
    font-weight: bold;
}

.last-seen {
    font-size: 12px;
    color: var(--text-secondary);
    display: block;
}

.messages {
    height: 50vh;
    overflow-y: auto;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.msg {
    max-width: 70%;
    padding: 10px;
    border-radius: 12px;
    font-size: 15px;
    line-height: 1.4;
    position: relative;
}

.msg.sent {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--accent-purple), #7c3aed);
    border-bottom-right-radius: 4px;
}

.msg.received {
    align-self: flex-start;
    background: #2a2a2a;
    border-bottom-left-radius: 4px;
}

.msg time {
    font-size: 10px;
    color: #999;
    display: block;
    margin-top: 5px;
}

.msg audio {
    width: 100%;
    margin-top: 5px;
}

.file-link {
    display: inline-block;
    background: rgba(255,255,255,0.1);
    padding: 5px 10px;
    border-radius: 6px;
    margin-top: 5px;
    color: var(--accent-purple);
}

/* Input area */
.input-area {
    padding: 10px 0;
}

.input-area form {
    display: flex;
    align-items: center;
    gap: 5px;
}

.input-area input[type="text"] {
    flex: 1;
    background: var(--bg-secondary);
    border: none;
    padding: 12px;
    border-radius: 8px;
    color: var(--text-primary);
}

.btn-file, .btn-voice, .btn-send {
    background: var(--bg-secondary);
    border: 1px solid #444;
    color: var(--accent-purple);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    width: auto;
    margin: 0;
}

.btn-send {
    background: var(--accent-purple);
    color: white;
}

.btn-voice:active {
    background: var(--accent-red);
    color: white;
}

/* Upload progress */
.upload-progress {
    padding: 5px;
}
.progress-bar {
    width: 100%;
    height: 20px;
    background: #333;
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}
.progress-bar span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent-red));
    text-align: center;
    color: white;
    font-size: 12px;
    line-height: 20px;
    transition: width 0.3s;
}

/* Group members select */
.member-select label {
    display: block;
    padding: 8px;
    background: var(--bg-secondary);
    border-radius: 6px;
    margin: 5px 0;
    cursor: pointer;
}

/* Responsive */
@media (max-width: 600px) {
    .container, .form-container, .dashboard, .chat-container {
        padding: 10px;
        border-radius: 8px;
    }
    .dashboard header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    .msg {
        max-width: 85%;
    }
    .input-area form {
        flex-wrap: wrap;
    }
    .input-area input[type="text"] {
        min-width: 60%;
    }
}