:root {
    --bg-color: #f4f4f9;
    --card-bg: #ffffff;
    --text-color: #333333;
    --border-color: #e0e0e0;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --nav-bg: #ffffff;
}

body.dark-mode {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --border-color: #334155;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --nav-bg: #1e293b;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
}

.nav-links button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    margin-left: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 500;
}

.nav-links button.active {
    background-color: var(--primary);
    color: white;
}

.main-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.view-section {
    display: none;
    width: 100%;
    max-width: 500px;
}

.view-section.active {
    display: block;
}

#view-app.active {
    display: flex;
    max-width: 1000px;
    height: 100%;
}

.card {
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
    border: 1px solid var(--border-color);
}

h2 {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

input, select {
    width: 100%;
    padding: 0.75rem;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
    box-sizing: border-box;
}

button {
    font-family: inherit;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 1.5rem;
    transition: background-color 0.2s;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    width: 100%;
}

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

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: #94a3b8;
}

.btn-danger {
    background-color: var(--danger);
    color: white;
}

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

.error-msg { color: var(--danger); margin-top: 1rem; font-size: 0.9rem; }
.success-msg { color: #10b981; margin-top: 1rem; font-size: 0.9rem; }

.setting-group {
    text-align: left;
    margin-top: 1.5rem;
}

.setting-group label {
    font-weight: 500;
    font-size: 0.9rem;
    display: block;
}

.toggle-auth {
    margin-top: 1.5rem;
    font-size: 0.9rem;
}

.toggle-auth span {
    color: var(--primary);
    cursor: pointer;
    font-weight: 600;
}

/* App View Styles */
#app-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    border: 1px solid var(--border-color);
}

#video-container {
    display: flex;
    justify-content: space-around;
    padding: 1rem;
    background-color: #000;
    flex: 1;
}

.video-wrapper {
    position: relative;
    width: 48%;
    background-color: #111;
    border-radius: 8px;
    overflow: hidden;
}

video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.label {
    position: absolute;
    bottom: 10px;
    left: 10px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.8rem;
}

#controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

#controls button { margin-top: 0; }

#chat-container {
    display: flex;
    flex-direction: column;
    height: 300px;
}

#chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.message {
    margin-bottom: 0.5rem;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    max-width: 70%;
    word-wrap: break-word;
    font-size: 0.95rem;
}

.message.self {
    align-self: flex-end;
    background-color: var(--primary);
    color: white;
}

.message.peer {
    align-self: flex-start;
    background-color: var(--border-color);
    color: var(--text-color);
}

#chat-input-container {
    display: flex;
    padding: 1rem;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    gap: 0.5rem;
}

#chat-input {
    margin-top: 0;
    flex: 1;
}

#send-btn {
    margin-top: 0;
    width: auto;
}