@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600&display=swap");

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

:root {
    --bg-color: #131314;
    --sidebar-bg: #1E1F20;
    --chat-bg: #131314;
    --input-bg: #1E1F20;
    --text-color: #E3E3E3;
    --sub-text: #A0A0A0;
    --primary-accent: #4285f4;
    --hover-bg: #2A2B2D;
    --border-color: #444;
    --user-msg-bg: #2A2B2D;
    --code-bg: #28292a;
}

body.light_mode {
    --bg-color: #FFFFFF;
    --sidebar-bg: #F0F4F9;
    --chat-bg: #FFFFFF;
    --input-bg: #F0F4F9;
    --text-color: #1F1F1F;
    --sub-text: #5F6368;
    --primary-accent: #0b57d0;
    --hover-bg: #DDE3EA;
    --border-color: #E0E0E0;
    --user-msg-bg: #E7F0FE;
    --code-bg: #f4f4f4;
}

body { background-color: var(--bg-color); color: var(--text-color); height: 100vh; display: flex; overflow: hidden; }

/* --- Sidebar --- */
.app-shell { display: flex; width: 100%; height: 100%; }

.sidebar { 
    width: 280px; 
    background-color: var(--sidebar-bg); 
    display: flex; 
    flex-direction: column; 
    padding: 1rem; 
    transition: margin-left 0.3s ease, transform 0.3s ease, width 0.3s ease, padding 0.3s ease;
    z-index: 100; 
    flex-shrink: 0; 
    border-right: 1px solid var(--border-color);
    white-space: nowrap; 
    overflow: hidden;
}

/* DESKTOP COLLAPSE STATE FIX */
body.sidebar-collapsed .sidebar {
    width: 0;
    padding: 0;
    border: none;
    margin-left: 0; 
}

.sidebar-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.logo-area { display: flex; align-items: center; gap: 10px; }
.icon-logo { color: #d96570; font-size: 1.8rem; }

.model-selector-wrapper { margin-bottom: 1rem; }
.model-selector-wrapper label { font-size: 0.75rem; color: var(--sub-text); display: block; margin-bottom: 0.4rem; margin-left: 0.2rem; }
#model-select { width: 100%; padding: 0.6rem; border-radius: 0.5rem; background: var(--bg-color); color: var(--text-color); border: 1px solid var(--border-color); outline: none; font-size: 0.9rem; cursor: pointer; }

.new-chat-btn { display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem; background-color: var(--hover-bg); color: var(--text-color); border: none; border-radius: 2rem; cursor: pointer; width: 100%; transition: 0.2s; font-weight: 500; }
.new-chat-btn:hover { filter: brightness(1.1); }

.recent-list { flex: 1; overflow-y: auto; margin: 1.5rem 0; }
.recent-title { font-size: 0.75rem; color: var(--sub-text); margin-bottom: 0.5rem; padding-left: 0.5rem; text-transform: uppercase; }
.no-history-msg { padding: 1rem; font-size: 0.85rem; color: var(--sub-text); font-style: italic; text-align: center; }

.history-item { padding: 0.7rem 0.8rem; border-radius: 0.5rem; color: var(--text-color); cursor: pointer; display: flex; align-items: center; justify-content: space-between; font-size: 0.9rem; margin-bottom: 2px; }
.history-item:hover, .history-item.active { background-color: var(--hover-bg); }
.history-item .title { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-right: 10px; }
.history-item .delete-chat { opacity: 0; font-size: 1.1rem; color: var(--sub-text); transition: 0.2s; }
.history-item:hover .delete-chat { opacity: 1; }

.sidebar-nav { display: flex; flex-direction: column; gap: 0.5rem; border-top: 1px solid var(--border-color); padding-top: 1rem; }
.sidebar-action { display: flex; align-items: center; gap: 0.75rem; background: none; border: none; color: var(--text-color); padding: 0.7rem; width: 100%; cursor: pointer; border-radius: 0.5rem; font-size: 0.9rem; }
.sidebar-action:hover { background-color: var(--hover-bg); }

/* Main Area */
.main-area { flex: 1; display: flex; flex-direction: column; background-color: var(--chat-bg); position: relative; width: 100%; transition: width 0.3s ease; }
.top-bar { display: flex; align-items: center; padding: 1rem 1.5rem; gap: 1rem; position: sticky; top: 0; z-index: 10; }
.top-bar .icon { background: none; border: none; color: var(--sub-text); cursor: pointer; font-size: 1.5rem; padding: 5px; border-radius: 50%; }
.top-bar .icon:hover { background: var(--hover-bg); color: var(--text-color); }

.header { padding: 2rem; text-align: center; margin: auto; max-width: 800px; width: 100%; animation: fadeIn 0.5s ease; }
body.hide-header .header { display: none; }
.header .title { font-size: 2.8rem; background: linear-gradient(to right, #4285f4, #d96570); -webkit-background-clip: text; -webkit-text-fill-color: transparent; line-height: 1.2; margin-bottom: 0.5rem; }
.header .subtitle { color: var(--sub-text); margin-bottom: 3rem; font-weight: 400; font-size: 1.5rem; }

.suggestion-list { display: flex; gap: 1rem; overflow-x: auto; justify-content: center; list-style: none; padding-bottom: 1rem; scrollbar-width: none; }
.suggestion { background-color: var(--input-bg); border: 1px solid var(--border-color); padding: 1.2rem; border-radius: 1rem; min-width: 180px; width: 200px; cursor: pointer; text-align: left; transition: 0.2s; display: flex; flex-direction: column; justify-content: space-between; height: 160px; }
.suggestion:hover { background-color: var(--hover-bg); transform: translateY(-2px); }

/* Chat List */
.chat-list { flex: 1; overflow-y: auto; padding: 1rem 1rem 2rem; max-width: 900px; width: 100%; margin: 0 auto; scroll-behavior: smooth; }
.message { margin-top: 1.5rem; display: flex; gap: 1rem; width: 100%; animation: fadeIn 0.3s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.message.outgoing { justify-content: flex-end; }
.message .avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; margin-top: 2px; flex-shrink: 0; }
.message-content { max-width: 85%; display: flex; flex-direction: column; }
.message.outgoing .text-box { background-color: var(--user-msg-bg); padding: 0.8rem 1.2rem; border-radius: 1.2rem 0.2rem 1.2rem 1.2rem; color: var(--text-color); }
.message.incoming .text-box { color: var(--text-color); width: 100%; overflow-x: hidden; line-height: 1.6; }
.text-box pre { background: var(--code-bg); padding: 1rem; border-radius: 0.5rem; overflow-x: auto; margin: 0.8rem 0; border: 1px solid var(--border-color); }
.timestamp { font-size: 0.7rem; color: var(--sub-text); margin-top: 5px; align-self: flex-end; }

/* Typing Area */
.typing-area { width: 100%; padding: 1.5rem 1rem; background-color: var(--chat-bg); position: relative; z-index: 20; }
.typing-container { max-width: 850px; margin: 0 auto; position: relative; }
.input-wrapper { display: flex; align-items: flex-end; background-color: var(--input-bg); border-radius: 1.5rem; padding: 0.8rem 1rem; gap: 0.8rem; border: 1px solid var(--border-color); transition: border 0.2s; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
.input-wrapper:focus-within { border-color: var(--sub-text); }
.typing-input { flex: 1; background: transparent; border: none; outline: none; color: var(--text-color); font-size: 1rem; resize: none; max-height: 200px; line-height: 1.5; padding: 0; margin-bottom: 2px; }
.typing-input::placeholder { color: var(--sub-text); }
.action-btn { background: none; border: none; color: var(--sub-text); padding: 0; cursor: pointer; transition: 0.2s; display: flex; align-items: center; justify-content: center; margin-bottom: 4px; }
.action-btn:hover, .action-btn.active { color: var(--text-color); transform: scale(1.1); }
.send-btn { background: var(--text-color); color: var(--bg-color); border: none; border-radius: 50%; width: 35px; height: 35px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: 0.2s; margin-bottom: 0; flex-shrink: 0; }
.send-btn:disabled { opacity: 0.5; cursor: default; }

/* File Preview */
.file-preview-wrapper { padding: 0 1rem 0.8rem; display: none; }
.file-preview-wrapper.active { display: block; }
.file-chip { display: inline-flex; align-items: center; gap: 0.8rem; background: var(--hover-bg); padding: 0.6rem 1rem; border-radius: 0.8rem; font-size: 0.9rem; border: 1px solid var(--border-color); color: var(--text-color); }
.file-chip img { width: 30px; height: 30px; object-fit: cover; border-radius: 4px; }
.disclaimer-text { text-align: center; font-size: 0.75rem; color: var(--sub-text); margin-top: 0.8rem; }
.scroll-bottom-btn { position: absolute; bottom: 110px; left: 50%; transform: translateX(-50%); background: var(--hover-bg); border: 1px solid var(--border-color); color: var(--text-color); border-radius: 50%; width: 40px; height: 40px; cursor: pointer; display: none; z-index: 50; align-items: center; justify-content: center; }
.scroll-bottom-btn.show { display: flex; }

/* Responsive */
.sidebar-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 90; opacity: 0; pointer-events: none; transition: 0.3s; backdrop-filter: blur(2px); }
.mobile-only { display: none !important; }
.brand-mobile { display: none; }

@media (max-width: 768px) {
    .sidebar { position: fixed; left: -100%; top: 0; bottom: 0; box-shadow: 5px 0 15px rgba(0,0,0,0.5); width: 280px; }
    body.mobile-sidebar-open .sidebar { left: 0; }
    body.mobile-sidebar-open .sidebar-overlay { opacity: 1; pointer-events: auto; }
    .mobile-only { display: block !important; }
    .brand-mobile { display: block; font-weight: 600; color: var(--text-color); font-size: 1.1rem; }
    .header .title { font-size: 2.2rem; }
    .header .subtitle { font-size: 1.2rem; }
}

/* Modal */
#notification-modal { position: fixed; inset: 0; background: rgba(0,0,0,0.7); display: none; align-items: center; justify-content: center; z-index: 2000; backdrop-filter: blur(3px); }
#notification-modal.open { display: flex; }
.modal-content { background: var(--sidebar-bg); padding: 2rem; border-radius: 1rem; text-align: center; width: 90%; max-width: 320px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); border: 1px solid var(--border-color); }
.modal-actions { display: flex; gap: 1rem; justify-content: center; margin-top: 1.5rem; }
.modal-btn { padding: 0.6rem 1.5rem; border-radius: 2rem; border: none; cursor: pointer; font-weight: 500; }
.confirm-yes { background: #e55865; color: white; }
.confirm-no { background: var(--hover-bg); color: var(--text-color); border: 1px solid var(--border-color); }