* { box-sizing: border-box; margin: 0; padding: 0; font-family: Arial, sans-serif; }
body { background: var(--bg-color); color: var(--text-color); height: 100vh; display: flex; flex-direction: column; }
.chat-header { background: var(--header-bg); padding: 15px 20px; display: flex; justify-content: space-between; align-items: center; border-bottom: 2px solid var(--accent-color); }
.chat-header h1 { font-size: 20px; }
.lang-switch a { color: var(--accent-color); text-decoration: none; font-weight: bold; }
.chat-wrapper { display: flex; flex: 1; overflow: hidden; }
.chat-sidebar { width: 250px; background: var(--bg-color); border-left: 1px solid var(--header-bg); padding: 15px; }
.chat-sidebar h3 { font-size: 14px; color: #99aab5; text-transform: uppercase; margin-bottom: 10px; }
.user-list { list-style: none; }
.user-list li { color: var(--accent-color); padding: 5px 0; }
.chat-main { flex: 1; display: flex; flex-direction: column; background: var(--panel-bg); }
.messages { flex: 1; padding: 20px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; }
.msg { background: var(--msg-bg); padding: 10px; border-radius: 8px; max-width: 80%; }
.msg .author { color: var(--accent-color); font-weight: bold; margin-right: 10px; }
.msg .time { font-size: 11px; color: #99aab5; float: right; margin-left: 10px; }
.input-area { padding: 15px; background: var(--msg-bg); display: flex; gap: 10px; }
.input-area input { flex: 1; padding: 12px; border: none; border-radius: 5px; background: var(--bg-color); color: var(--text-color); outline: none; }
.input-area button { padding: 12px 25px; border: none; border-radius: 5px; background: var(--accent-color); color: #fff; cursor: pointer; font-weight: bold; }
.system-msg { text-align: center; color: #99aab5; font-size: 13px; margin: 10px 0; font-style: italic; }
.landing-container { display: flex; flex: 1; align-items: center; justify-content: center; gap: 40px; padding: 40px; background: linear-gradient(135deg, var(--bg-color) 0%, #1e2124 100%); overflow-y: auto; }
.landing-left { flex: 1; max-width: 500px; }
.landing-left h1 { font-size: 42px; margin-bottom: 15px; line-height: 1.2; }
.landing-left h1 span { color: var(--accent-color); }
.landing-left p { color: #99aab5; margin-bottom: 30px; font-size: 16px; }
.landing-forms { background: var(--panel-bg); padding: 25px; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.3); }
.tabs { display: flex; justify-content: space-between; margin-bottom: 20px; border-bottom: 1px solid #444; padding-bottom: 10px; }
.tab-btn { background: none; border: none; color: #99aab5; font-weight: bold; font-size: 16px; cursor: pointer; transition: 0.2s; }
.tab-btn:hover { color: #fff; }
.tab-btn.active { color: var(--accent-color); }
.btn-primary { width: 100%; padding: 12px; background: var(--accent-color); color: white; border: none; border-radius: 5px; cursor: pointer; font-weight: bold; font-size: 16px; transition: 0.2s; }
.btn-primary:hover { opacity: 0.8; }
.landing-right { flex: 1; max-width: 500px; background: var(--panel-bg); border-radius: 12px; display: flex; flex-direction: column; height: 500px; box-shadow: 0 10px 30px rgba(0,0,0,0.3); border: 1px solid #444; }
.preview-header { padding: 15px 20px; border-bottom: 1px solid #444; background: var(--header-bg); border-radius: 12px 12px 0 0; }
.preview-header h3 { font-size: 16px; font-weight: normal; }
.online-badge { background: #43b581; color: #fff; padding: 2px 8px; border-radius: 12px; font-weight: bold; font-size: 14px; margin: 0 5px; }
.preview-messages { flex: 1; padding: 20px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; opacity: 0.8; }
.preview-footer { padding: 15px; text-align: center; border-top: 1px solid #444; color: #99aab5; font-size: 14px; }
@media (max-width: 900px) { .landing-container { flex-direction: column; padding: 20px; } .landing-left h1 { font-size: 32px; } .landing-right { width: 100%; height: 400px; } }