/* --- Global Theme & Variables --- */
:root {
    --bg-color: #1a1a2a; /* Dark blue-gray */
    --surface-color: #2a2a3a; /* Slightly lighter surface */
    --primary-color: #8a4fff; /* Vibrant Purple */
    --secondary-color: #30d5c8; /* Teal accent */
    --text-color: #e0e0e0;
    --text-muted-color: #a0a0a0;
    --border-color: #444455;
    --success-color: #28a745;
    --error-color: #dc3545;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* --- Basic Styles & Layout --- */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 40px auto;
    background-color: var(--surface-color);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
}

.hidden { display: none !important; }

/* --- Header --- */
.main-header {
    background-color: var(--surface-color);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
}
.header-content {
    max-width: 1200px;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header-content h1 { font-size: 1.5rem; margin: 0; }
#welcome-message { margin-right: 1rem; color: var(--text-muted-color); }

/* --- Buttons & Links --- */
.btn-container { display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; }
.btn {
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}
.btn-primary { background-color: var(--primary-color); color: #ffffff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 15px rgba(138, 79, 255, 0.4); }
.btn-secondary { background-color: transparent; color: var(--secondary-color); border: 2px solid var(--secondary-color); }
.btn-secondary:hover { background-color: var(--secondary-color); color: var(--bg-color); }
.btn-danger { background-color: var(--error-color); color: white; }
.btn-success { background-color: var(--success-color); color: white; }
a { color: var(--secondary-color); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Forms --- */
.form-container { max-width: 500px; }
.form-group { margin-bottom: 1.5rem; text-align: left; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
}
.form-group input:focus { border-color: var(--primary-color); outline: none; }
.form-divider { border-color: var(--border-color); margin: 2rem 0; }
.form-note { color: var(--text-muted-color); font-size: 0.9rem; }
.form-switch, .form-links { margin-top: 1.5rem; }

/* --- Dashboard --- */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1400px;
    margin: auto;
}
.card {
    background-color: var(--surface-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}
.card h3 { border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; margin-bottom: 1rem; }

/* Profile Card */
.profile-card { text-align: center; }
.profile-img { width: 120px; height: 120px; border-radius: 50%; object-fit: cover; border: 4px solid var(--primary-color); margin-bottom: 1rem; }
#profile-name { margin: 0; color: var(--text-color); }
.skills-container { display: flex; justify-content: space-around; text-align: left; margin-top: 1rem; }
.skills-list { list-style: none; padding-left: 0; }
.skills-list li { background-color: var(--bg-color); padding: 5px 10px; border-radius: 5px; margin-bottom: 5px; font-size: 0.9rem; }

/* Lists (Notifications, Friends, etc.) */
.item-list { max-height: 200px; overflow-y: auto; }
.item-list .list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}
.item-list .list-item:hover { background-color: var(--bg-color); }
.item-list .list-item:last-child { border-bottom: none; }
.list-item button { margin-left: 10px; padding: 5px 8px; font-size: 0.8rem; }

/* Chat */
.chat-card #friends-list .list-item.active { background-color: var(--primary-color); }
#chat-window { margin-top: 1rem; }
#chat-messages { height: 180px; overflow-y: auto; border: 1px solid var(--border-color); border-radius: 8px; padding: 10px; margin-bottom: 10px; }
#chat-messages .message { margin-bottom: 10px; }
#chat-messages .message.sent { text-align: right; }
#chat-messages .message p { display: inline-block; max-width: 70%; padding: 8px 12px; border-radius: 15px; background-color: var(--bg-color); }
#chat-messages .message.sent p { background-color: var(--primary-color); }
#chat-form { display: flex; }
#chat-form input { flex-grow: 1; border-radius: 8px 0 0 8px; }
#chat-form button { border-radius: 0 8px 8px 0; }

/* Video Call */
.video-container { display: flex; gap: 1rem; margin-top: 1rem; background-color: #000; border-radius: 8px; }
#local-video, #remote-video { width: 50%; aspect-ratio: 4 / 3; background-color: #111; }

/* --- Community Page --- */
.community-container { padding: 2rem; max-width: 1200px; margin: auto; }
.search-bar { margin-bottom: 2rem; }
#search-input { width: 100%; padding: 15px; font-size: 1.2rem; background-color: var(--surface-color); border: 1px solid var(--border-color); color: var(--text-color); border-radius: 8px; }
.user-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.user-card { background-color: var(--surface-color); padding: 1.5rem; border-radius: 12px; text-align: center; }
.map-container { height: 400px; border-radius: 12px; margin-top: 1rem; }