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:root{--bg:#fff;--text:#333;--text-main:#333;--text-muted:#555;--muted:#555;--primary:#001f3f;--accent:#1e90ff;--card:#fff;--card-bg:#f8f9fa;--input-bg:#f0f2f5;--input-border:#ddd;--border-color:#e0e0e0;--nav-bg:#fff}.dark{--bg:#0b0f15;--text:#e6eef8;--text-main:#e6eef8;--text-muted:#c3cfdf;--muted:#c3cfdf;--primary:#9fc5ff;--accent:#4aa3ff;--card:#0f1720;--card-bg:#0f1720;--input-bg:#1a2332;--input-border:#2d3b4e;--border-color:#ffffff1a;--nav-bg:#071027}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg);height:100vh;color:var(--text-main);flex-direction:column;transition:background .4s;display:flex;overflow:auto}.page-wrapper{flex:1;justify-content:center;align-items:flex-start;width:100%;max-width:1200px;margin:0 auto;padding-top:40px;padding-bottom:40px;display:flex}.glass-background{display:none}.welcome-screen{background:var(--bg);z-index:9999;justify-content:center;align-items:center;transition:opacity .8s cubic-bezier(.4,0,.2,1),visibility .8s;display:flex;position:fixed;inset:0}.welcome-content{text-align:center;animation:.8s fadeInDown}.welcome-logo img{border:3px solid var(--accent);border-radius:50%;width:110px;height:110px;margin-bottom:24px;animation:2s infinite welcomePulse;box-shadow:0 4px 15px #0000001a}.welcome-title{letter-spacing:-.5px;color:var(--primary);margin-bottom:8px;font-size:28px;font-weight:800}.welcome-subtitle{color:var(--text-muted);margin-bottom:35px;font-size:15px;font-weight:500}.loader-bar{background:var(--border);border-radius:10px;width:220px;height:5px;margin:0 auto;overflow:hidden}.loader-progress{background:var(--accent);border-radius:10px;width:0%;height:100%;animation:2s ease-in-out forwards loadProgress}.welcome-hidden{opacity:0;visibility:hidden;pointer-events:none}.echo-container{background:var(--card);border:1px solid var(--border-color);width:100%;max-width:600px;min-height:600px;box-shadow:0 4px 20px var(--shadow);border-radius:16px;flex-direction:column;animation:.6s ease-out backwards containerReveal;display:flex;overflow:hidden}@media (max-width:768px){.page-wrapper{padding:20px 15px}.echo-container{border-radius:12px;max-width:100%;min-height:calc(100vh - 160px)}}@media (max-width:480px){.echo-container{border-left:none;border-right:none;border-radius:0;width:100%;min-height:calc(100vh - 140px)}}.echo-header{background:var(--card);border-bottom:1px solid var(--border-color);align-items:center;gap:14px;padding:18px 24px;display:flex}.avatar-wrapper{width:42px;height:42px;position:relative}.echo-avatar-img{object-fit:cover;border:2px solid var(--accent);border-radius:50%;width:100%;height:100%}.status-dot.online{border:2px solid var(--bg);background:#22c55e;border-radius:50%;width:10px;height:10px;position:absolute;bottom:2px;right:2px}.bot-text h1{color:var(--primary);margin:0;font-size:17px;font-weight:700}.bot-text p{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin:0;font-size:11px;font-weight:600}.theme-toggle{border:1px solid var(--border);cursor:pointer;width:36px;height:36px;color:var(--text-main);background:0 0;border-radius:50%;justify-content:center;align-items:center;margin-left:auto;font-size:16px;transition:all .2s;display:flex}.theme-toggle:hover{background:var(--input-bg)}.chat-messages{scroll-behavior:smooth;background:var(--card);flex-direction:column;flex:1;gap:16px;padding:20px;display:flex;overflow-y:auto}.chat-messages::-webkit-scrollbar{width:4px}.chat-messages::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:10px}.msg{flex-direction:column;max-width:85%;animation:.3s ease-out both bubblePop;display:flex}.bot-msg{transform-origin:0 0;align-self:flex-start}.user-msg{transform-origin:100% 0;align-self:flex-end}.bubble{border-radius:18px;padding:12px 16px;font-size:15px;line-height:1.5}.glass-bubble{background:var(--input-bg);color:var(--text-main);border:1px solid var(--border-color);border-top-left-radius:4px}.user-msg .bubble{background:var(--accent);color:#fff;border-top-right-radius:4px;box-shadow:0 2px 6px #1e90ff33}.subject-card{background:var(--card-bg);color:var(--text-main);border:1px solid var(--border-color);border-radius:12px;align-items:center;gap:14px;margin-top:8px;padding:14px;text-decoration:none;transition:all .2s;display:flex}.subject-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 12px #00000014}.card-icon{width:40px;height:40px;color:var(--accent);background:#1e90ff1a;border-radius:10px;justify-content:center;align-items:center;font-size:18px;display:flex}.echo-footer{background:var(--card);border-top:1px solid var(--border-color);padding:16px 24px 24px}.input-wrapper{background:var(--input-bg);border:1px solid var(--input-border);border-radius:20px;align-items:center;padding:6px 6px 6px 16px;transition:border-color .2s;display:flex}.input-wrapper:focus-within{background:var(--card-bg);border-color:var(--accent);transform:none;box-shadow:0 0 0 2px #1e90ff1a}#user-input{color:var(--text-main);background:0 0;border:none;outline:none;flex:1;width:100%;padding:10px 0;font-size:15px}#send-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:14px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;transition:all .2s;display:flex}#send-btn:hover{background:var(--primary);box-shadow:none;transform:none}#send-btn:disabled{opacity:.5;cursor:not-allowed;background:var(--text-muted)}@keyframes containerReveal{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes bubblePop{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes welcomePulse{0%,to{transform:scale(1)}50%{transform:scale(1.02)}}@keyframes loadProgress{0%{width:0%}to{width:100%}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@media (min-width:769px){.mobile-only{display:none!important}.desktop-only{display:flex!important}}@media (max-width:768px){.desktop-only{display:none!important}.mobile-only{display:block!important}}.navbar{background-color:var(--nav-bg,#fff);z-index:1000;justify-content:space-between;align-items:center;height:60px;padding:0;transition:all .3s;display:flex;position:sticky;top:0;box-shadow:0 1px 3px #0000001a}.navbar.scrolled{box-shadow:0 4px 10px #0000001a}.navbar .logo{color:var(--primary);text-transform:uppercase;flex-shrink:0;align-items:center;gap:8px;margin-left:15px;font-family:Poppins,sans-serif;font-size:20px;font-weight:900;text-decoration:none;display:flex}.navbar .logo img{object-fit:cover;border-radius:50%;width:35px;height:35px;margin-right:5px}.navbar .nav-links{align-items:center;gap:4px;margin:0 15px 0 0;padding:0;list-style:none;display:flex}.navbar .nav-links a{color:var(--text-main);align-items:center;gap:8px;padding:5px 10px;font-size:15px;font-weight:700;text-decoration:none;transition:color .3s;display:flex}.navbar .nav-links i{color:var(--primary);text-align:center;width:20px;font-size:16px}.navbar .nav-links a:hover,.navbar .nav-links a.active,.navbar .nav-links a:hover i,.navbar .nav-links a.active i{color:var(--accent)}.theme-toggle-btn{background:var(--bg);border:2px solid var(--primary);color:var(--primary);cursor:pointer;border-radius:999px;align-items:center;gap:8px;margin-right:20px;padding:8px 16px;font-size:14px;font-weight:700;transition:all .3s;display:inline-flex;box-shadow:0 2px 8px #00000014}.theme-toggle-btn i{font-size:16px;transition:transform .3s}.theme-toggle-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 12px #1e90ff40}.theme-toggle-btn:hover i{transform:rotate(20deg)}.theme-toggle-btn:active{transform:translateY(0)}.dropdown{display:inline-block;position:relative}.dropdown-content{background-color:var(--card-bg);z-index:1;border:1px solid var(--border);border-radius:8px;min-width:200px;display:none;position:absolute;top:100%;left:0;overflow:hidden;box-shadow:0 8px 16px #0003}.dropdown-content a{color:var(--text-main);padding:12px 16px;text-decoration:none;display:block}.dropdown-content a:hover{background-color:var(--input-bg);color:var(--accent)}.dropdown:hover .dropdown-content{display:block}.mobile-nav-container{background:var(--bg);z-index:1000;width:100%;padding:2px 12px;position:relative;box-shadow:0 2px 10px #0000000d}.mobile-brand{text-align:center;color:var(--primary);justify-content:center;align-items:center;gap:8px;margin-bottom:4px;padding-top:5px;font-size:20px;font-weight:800;display:flex}.mobile-brand img{object-fit:cover;border-radius:50%;width:28px;height:28px}.mobile-grid{grid-template-columns:repeat(4,1fr);gap:4px;padding-bottom:4px;display:grid;position:relative}.nav-btn{background:var(--bg);height:60px;color:var(--text-main);cursor:pointer;letter-spacing:.3px;border:1px solid #0000000a;border-radius:16px;flex-direction:column;justify-content:center;align-items:center;font-size:10px;font-weight:700;text-decoration:none;transition:all .2s cubic-bezier(.25,.8,.25,1);display:flex;position:relative;overflow:hidden;box-shadow:0 4px 12px #0000000d}.nav-btn:hover{border-color:#00000014;transform:translateY(-3px);box-shadow:0 8px 20px #00000014}.nav-btn:active{transform:scale(.96)}.nav-btn i{color:var(--primary);margin-bottom:5px;font-size:18px}.nav-btn span{text-transform:uppercase;text-align:center;white-space:nowrap;text-overflow:ellipsis;width:100%;margin-top:4px;font-size:9px;overflow:hidden}.mobile-grid-dropdown{background:var(--input-bg);border:1px solid var(--border);border-radius:12px;grid-column:1/-1;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:5px;margin-bottom:5px;padding:10px;animation:.2s ease-out slideDown;display:grid}.dropdown-item{background:var(--bg);color:var(--text-main);border:1px solid #0000;border-radius:8px;align-items:center;gap:8px;padding:8px 10px;font-size:11px;font-weight:600;text-decoration:none;transition:all .15s;display:flex}.dropdown-item i{color:var(--primary);text-align:center;width:16px;font-size:14px}@keyframes slideDown{0%{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}.new-footer-section{color:#fff;text-align:center;background-color:#001f3f;margin-top:auto;padding:30px 20px}.new-footer-content{max-width:1200px;margin:0 auto}.social-icons-list{justify-content:center;gap:20px;margin-bottom:20px;padding:0;list-style:none;display:flex}.social-icons-list a{color:#fff;font-size:24px;transition:color .3s,transform .3s}.social-icons-list a:hover{color:var(--accent);transform:translateY(-3px)}.footer-credits p{opacity:.8;margin:5px 0;font-size:14px}