:root {
    --bg-main: #f7f9fc;
    --bg-header: #ffffff;
    --bg-input-area: #f0f2f5;
    --bg-bubble-user: #ede7f6;
    --bg-bubble-alya: #ffffff;
    --bg-bubble-system: #e9e9eb;
    --bg-control: #ffffff;
    --text-dark: #1c1e21;
    --text-light: #65676b;
    --text-alya-bubble: #1c1e21;
    --text-user-bubble: #1c1e21;
    --text-system-bubble: #65676b;
    --border-color: #e0e0e0;
    --primary-accent: #7e57c2;
    --secondary-accent: #a78bfa;
    --danger-accent: #ef5350;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --app-height: 100vh;
}
body[data-theme='dark'] {
    --bg-main: #0d1117;
    --bg-header: #161b22;
    --bg-input-area: #161b22;
    --bg-bubble-user: #7e57c2;
    --bg-bubble-alya: #21262d;
    --bg-bubble-system: #21262d;
    --bg-control: #21262d;
    --text-dark: #c9d1d9;
    --text-light: #8b949e;
    --text-alya-bubble: #c9d1d9;
    --text-user-bubble: #ffffff;
    --text-system-bubble: #8b949e;
    --border-color: #30363d;
    --shadow-light: rgba(0, 0, 0, 0.2);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; transition: background-color 0.3s ease; }
body { font-family: 'Poppins', sans-serif; background-color: var(--bg-main); display: flex; justify-content: center; align-items: center; font-size: 14px; color: var(--text-dark); }
.chat-container { width: 100%; max-width: 800px; height: var(--app-height); background-color: var(--bg-header); border-radius: 24px; box-shadow: 0 10px 40px var(--shadow-light); display: flex; flex-direction: column; overflow: hidden; transition: background-color 0.3s ease; }
.chat-header { display: flex; align-items: center; padding: 15px 20px; background-color: var(--bg-header); border-bottom: 1px solid var(--border-color); flex-wrap: wrap; gap: 10px; transition: background-color 0.3s ease, border-color 0.3s ease; }
.profile-pic { width: 50px; height: 50px; border-radius: 50%; border: 2px solid var(--primary-accent); object-fit: cover; }
.header-info { display: flex; align-items: center; flex-grow: 1; }
.alya-name { font-size: 1.1em; font-weight: 600; margin-right: 8px; color: var(--text-dark); }
.status-dot { width: 8px; height: 8px; background-color: #4caf50; border-radius: 50%; margin-right: 5px; animation: pulse 2s infinite; }
.status-text { font-size: 0.85em; color: var(--text-light); }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.7); } 70% { box-shadow: 0 0 0 10px rgba(76, 175, 80, 0); } 100% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); } }
.controls-container { display: flex; gap: 10px; align-items: center; }
#userName { border: 1px solid var(--border-color); border-radius: 12px; background-color: var(--bg-control); padding: 8px 12px; font-size: 0.9em; color: var(--text-dark); max-width: 100px; font-family: 'Poppins', sans-serif; outline: none; transition: all 0.3s ease; }
#userName:focus { border-color: var(--secondary-accent); box-shadow: 0 0 0 3px var(--shadow-light); }
#theme-toggle-btn { background: var(--bg-control); border: 1px solid var(--border-color); width: 38px; height: 38px; display: flex; justify-content: center; align-items: center; cursor: pointer; transition: all 0.3s ease; flex-shrink: 0; border-radius: 12px; }
#theme-toggle-btn:hover { background-color: var(--border-color); transform: scale(1.1); }
#theme-toggle-btn svg { fill: var(--text-light); }
.settings-menu { position: relative; }
.settings-menu-button { display: flex; align-items: center; gap: 5px; background-color: var(--bg-control); border: 1px solid var(--border-color); border-radius: 12px; padding: 8px 12px; font-family: 'Poppins', sans-serif; font-size: 0.9em; color: var(--text-dark); cursor: pointer; transition: all 0.3s ease; }
.settings-menu-button:hover { border-color: var(--secondary-accent); }
.dropdown-arrow { fill: var(--text-light); width: 20px; height: 20px; transition: transform 0.3s ease; }
.settings-menu.active .dropdown-arrow { transform: rotate(180deg); }
.settings-menu-dropdown { position: absolute; top: calc(100% + 5px); right: 0; background-color: var(--bg-header); border: 1px solid var(--border-color); border-radius: 12px; box-shadow: 0 5px 15px var(--shadow-light); z-index: 10; width: 180px; overflow: hidden; opacity: 0; transform: scaleY(0.9); transform-origin: top; transition: all 0.2s ease; pointer-events: none; }
.settings-menu.active .settings-menu-dropdown { opacity: 1; transform: scaleY(1); pointer-events: auto; }
.dropdown-item { display: block; padding: 10px 15px; color: var(--text-dark); text-decoration: none; font-size: 0.9em; }
.dropdown-item:hover { background-color: var(--border-color); }
.dropdown-item.active { background-color: var(--primary-accent); color: white; font-weight: 500; }
.dropdown-item.danger { color: var(--danger-accent); }
.dropdown-item.danger:hover { background-color: var(--danger-accent); color: white; }
.dropdown-divider { height: 1px; background-color: var(--border-color); margin: 5px 0; }
.chat-box { flex-grow: 1; background-color: var(--bg-main); padding: 20px; overflow-y: auto; display: flex; flex-direction: column; gap: 12px; scroll-behavior: smooth; transition: background-color 0.3s ease; }
.chat-message { display: flex; align-items: flex-end; max-width: 75%; opacity: 0; transform: translateY(20px); animation: pop-in 0.5s forwards cubic-bezier(0.25, 0.46, 0.45, 0.94); }
.chat-message.no-animate { opacity: 1; transform: translateY(0); animation: none; }
@keyframes pop-in { to { opacity: 1; transform: translateY(0); } }
.bubble { padding: 10px 15px; border-radius: 20px; line-height: 1.5; box-shadow: 0 2px 5px var(--shadow-light); word-wrap: break-word; font-size: 0.95em; }
.user-message { align-self: flex-end; flex-direction: row-reverse; }
.user-message .bubble { background-color: var(--bg-bubble-user); color: var(--text-user-bubble); border-bottom-right-radius: 5px; }
.alya-message { align-self: flex-start; }
.alya-message .bubble { background-color: var(--bg-bubble-alya); color: var(--text-alya-bubble); border-bottom-left-radius: 5px; }
.system-message { align-self: center; width: auto; max-width: 90%; text-align: center; }
.system-message .bubble { background-color: var(--bg-bubble-system); color: var(--text-system-bubble); font-size: 0.8em; display: inline-block; padding: 5px 12px; box-shadow: none; border-radius: 15px; }
.chat-input-area { display: flex; align-items: flex-end; padding: 15px 20px; border-top: 1px solid var(--border-color); background-color: var(--bg-input-area); gap: 10px; min-height: 78px; transition: all 0.3s ease; flex-shrink: 0; }
#userInput { flex-grow: 1; border: 1px solid var(--border-color); border-radius: 18px; padding: 12px 18px; font-size: 1em; resize: none; max-height: 120px; overflow-y: auto; background-color: var(--bg-control); color: var(--text-dark); transition: all 0.3s ease; font-family: 'Poppins', sans-serif; }
#userInput:focus { outline: none; border-color: var(--primary-accent); box-shadow: 0 0 0 4px var(--shadow-light); }
#sendBtn { background-color: var(--primary-accent); border: none; border-radius: 50%; width: 48px; height: 48px; display: flex; justify-content: center; align-items: center; cursor: pointer; transition: all 0.3s ease; flex-shrink: 0; }
#sendBtn:hover { background-color: var(--secondary-accent); transform: scale(1.1) rotate(10deg); }
#sendBtn svg { width: 24px; height: 24px; fill: white; transform: translateX(2px); }
.bubble em { font-style: italic; font-weight: 500; color: var(--primary-accent); }
@media (max-width: 700px) {
    .chat-container { border-radius: 0; }
    .chat-header { flex-direction: column; align-items: flex-start; }
    .controls-container { width: 100%; justify-content: space-between; }
    #userName { flex-grow: 1; max-width: none; }
}
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--secondary-accent); }