* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Satoshi', sans-serif;
}

body {
    background-color: #FFFFFF;
    color: #000000;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.otr-header {
    background-color: #000000;
    color: #FFFFFF;
    padding: 16px 24px;
    font-size: 18px;
    font-weight: 700;
    width: 100%;
    letter-spacing: 0.5px;
}

.main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.welcome-zone {
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-width: 360px;
    width: 100%;
    text-align: left;
}

.welcome-zone label {
    font-size: 13px;
    font-weight: 600;
    color: #666666;
}

.welcome-zone input {
    width: 100%;
    padding: 12px 14px;
    background: #FFFFFF;
    border: 1.5px solid #000000;
    color: #000000;
    border-radius: 0;
    font-size: 14px;
    font-family: 'Satoshi', sans-serif;
}

.welcome-zone input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

#join-container {
    display: none;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

.btn {
    background-color: #000000;
    color: #FFFFFF;
    border: none;
    padding: 12px 16px;
    cursor: pointer;
    font-weight: 600;
    width: 100%;
    border-radius: 0;
    font-size: 14px;
    transition: background 0.2s;
    text-align: center;
    font-family: 'Satoshi', sans-serif;
}

.btn:hover { background-color: #333333; }

.btn.secondary {
    background-color: #FFFFFF;
    color: #000000;
    border: 1.5px solid #000000;
}

.btn.secondary:hover { background-color: #F0F0F0; }

.btn.danger {
    background-color: transparent;
    color: #CC0000;
    border: 1px solid #CC0000;
    padding: 4px 8px;
    font-size: 11px;
    width: auto;
    font-weight: 500;
}

.btn.danger:hover { background-color: #000000; color: #FFFFFF; }

.know-more-link {
    display: inline-block;
    margin-top: 10px;
    color: #999999;
    text-decoration: none;
    font-size: 13px;
    text-align: center;
}

.know-more-link:hover { color: #000000; text-decoration: underline; }

.room-layout {
    display: none;
    width: 100%;
    height: 100%;
    flex-direction: row;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    width: 260px;
    background-color: #FFFFFF;
    border-right: 1.5px solid #000000;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.user-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 13px;
    overflow-y: auto;
    flex: 1;
}

.user-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #FFFFFF;
    padding: 10px 12px;
    border: 1.5px solid #000000;
    border-radius: 0;
    color: #000000;
    font-weight: 500;
}

.admin-box {
    background: #FFFFFF;
    padding: 14px;
    border: 1.5px solid #000000;
    border-radius: 0;
    font-size: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.admin-box div { color: #666666; }
.admin-box span { font-weight: 700; color: #000000; word-break: break-all; display: block; margin-top: 2px; font-size: 11px; }
.admin-box .btn.secondary { margin-top: 12px; width: 100%; }

.chat-area { flex: 1; display: flex; flex-direction: column; background-color: #FFFFFF; }
.chat-feed {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    background-color: #FAFAFA;
}

.msg {
    padding: 10px 14px;
    max-width: 70%;
    word-break: break-word;
    font-size: 13.5px;
    border-radius: 0;
    line-height: 1.4;
}

.msg .sender { font-size: 11px; color: #999999; font-weight: 700; display: block; margin-bottom: 3px; }
.msg.me { align-self: flex-end; background-color: #000000; color: #FFFFFF; }
.msg.me .sender { color: #999999; }
.msg.partner { align-self: flex-start; background-color: #FFFFFF; color: #000000; border: 1.5px solid #000000; }
.msg.system { background: transparent; border: none; color: #BBBBBB; font-size: 12px; align-self: center; font-style: italic; padding: 0; }

.chat-bar { display: flex; padding: 16px; gap: 10px; background: #FFFFFF; border-top: 1.5px solid #000000; }
.chat-bar input {
    flex: 1;
    padding: 12px 14px;
    background-color: #FFFFFF;
    color: #000000;
    border: 1.5px solid #000000;
    border-radius: 0;
    font-size: 14px;
    font-family: 'Satoshi', sans-serif;
}

.chat-bar button {
    background-color: #000000;
    color: #FFFFFF;
    border: none;
    padding: 0 20px;
    cursor: pointer;
    font-weight: 600;
    border-radius: 0;
    font-size: 14px;
    transition: background 0.2s;
}

footer {
    background-color: #FFFFFF;
    color: #000000;
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11.5px;
    border-top: 1.5px solid #000000;
    position: relative;
}

.footer-copyright {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
}

.github-embed { margin-left: auto; }
.github-embed a { display: flex; align-items: center; gap: 6px; color: #000000; text-decoration: none; font-weight: 600; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #CCCCCC; border-radius: 0; }
::-webkit-scrollbar-thumb:hover { background: #000000; }