:root { 
    --bg: #000; --sidebar-bg: #050505; --gray: #0a0a0a; 
    --border: #1a1a1a; --accent: #fff; --red: #ff3b30; 
    --text-sec: #666; --text-dim: #444; --green: #00ff00;
}

body, html { 
    margin: 0; padding: 0; background: var(--bg); color: #fff; 
    font-family: 'Montserrat', sans-serif; min-height: 100vh;
}

/* Навігація */
nav { 
    display: flex; justify-content: space-between; align-items: center; 
    padding: 15px 5%; border-bottom: 1px solid var(--border); 
    position: sticky; top: 0; background: rgba(0,0,0,0.9); 
    backdrop-filter: blur(10px); z-index: 100; 
}
.nav-logo { font-weight: 600; letter-spacing: 4px; text-decoration: none; color: #fff; font-size: 20px; }
.nav-right { display: flex; align-items: center; gap: 12px; }

.nav-btn { 
    display: flex; align-items: center; justify-content: center; gap: 8px;
    font-size: 10px; font-weight: 600; letter-spacing: 1px; padding: 8px 12px; 
    border: 1px solid #333; cursor: pointer; background: none; color: #fff; 
    text-transform: uppercase; transition: 0.3s; text-decoration: none; 
}
.nav-btn i { width: 16px; height: 16px; }
.nav-btn:hover { background: #fff; color: #000; }
.nav-btn.icon-only { padding: 8px; border-radius: 2px; }

/* Dashboard & Columns */
.dashboard { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--border); flex: 1; }
.column { background: var(--bg); padding: 20px 15px; display: flex; flex-direction: column; gap: 15px; }
.column-header { 
    font-size: 9px; letter-spacing: 2px; color: var(--text-sec); text-transform: uppercase; 
    border-bottom: 1px solid var(--border); padding-bottom: 10px; margin-bottom: 10px; 
    position: sticky; top: 0; background: var(--bg); z-index: 5; 
}

/* Forms & Cards */
.card-box { background: var(--gray); border: 1px solid var(--border); padding: 30px; margin: 20px auto; max-width: 450px; }
input, textarea, select { 
    width: 100%; padding: 14px; background: #111; border: 1px solid #222; 
    color: #fff; margin-bottom: 20px; font-family: 'Montserrat'; box-sizing: border-box; outline: none; 
}
.btn-main { 
    width: 100%; padding: 15px; background: #fff; color: #000; border: none; 
    font-weight: 600; cursor: pointer; text-transform: uppercase; letter-spacing: 1px; 
}

/* Messenger */
.messenger-wrapper { display: flex; height: calc(100vh - 65px); width: 100vw; }
.chats-sidebar { width: 300px; border-right: 1px solid var(--border); background: var(--sidebar-bg); }
.chat-main { flex-grow: 1; display: flex; flex-direction: column; }
.messages-area { flex-grow: 1; padding: 30px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 70%; padding: 12px 18px; font-size: 13px; border-radius: 4px; }
.msg-in { align-self: flex-start; background: #111; border: 1px solid var(--border); }
.msg-out { align-self: flex-end; background: #fff; color: #000; }