@import url("https://fonts.googleapis.com/css2?family=Patrick+Hand&family=Poppins:wght@400;500;600;700&display=swap");:root{--blackboard-dark:#1a2f1a;--blackboard-main:#2d4a3e;--blackboard-light:#3d5a4e;--blackboard-border:#4a6b5a;--chalk-white:#f5f5dc;--chalk-yellow:#ffd93d;--chalk-orange:#ff9f43;--chalk-blue:#74b9ff;--chalk-pink:#fd79a8;--chalk-green:#55efc4;--wood-dark:#5d4037;--wood-main:#795548;--wood-light:#8d6e63;--wood-border:#6d4c41;--saffron:#ff9933;--indian-green:#138808;--navy-blue:#000080;--maroon:#800000;--text-primary:#f5f5dc;--text-secondary:#c8d6c8;--text-muted:#9ab89a;--success-color:#55efc4;--danger-color:#ff7675;--warning-color:#ffeaa7}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Poppins,sans-serif;background-color:var(--blackboard-dark);color:var(--text-primary);min-height:100vh}.chalk-text{font-family:Patrick Hand,cursive;text-shadow:0 0 5px rgba(245,245,220,.5)}.landing-container{min-height:100vh;display:flex;flex-direction:column}.landing-header{justify-content:space-between;padding:20px 40px;background:linear-gradient(90deg,var(--saffron) 0,var(--chalk-white) 50%,var(--indian-green) 100%)}.landing-header,.landing-logo{display:flex;align-items:center}.landing-logo{gap:12px;font-size:1.5rem;font-weight:700;color:var(--navy-blue)}.landing-logo i{font-size:2rem;color:var(--maroon)}.landing-nav{display:flex;gap:16px}.nav-btn{padding:10px 24px;border-radius:8px;font-weight:600;cursor:pointer;transition:all .3s ease;text-decoration:none;display:inline-flex;align-items:center;gap:8px}.nav-btn-outline{background:transparent;border:2px solid var(--navy-blue);color:var(--navy-blue)}.nav-btn-outline:hover{background:var(--navy-blue);color:white}.nav-btn-primary{background:linear-gradient(135deg,var(--saffron),var(--chalk-orange));border:2px solid var(--wood-border);color:var(--wood-dark);box-shadow:3px 3px 0 var(--wood-border)}.nav-btn-primary:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--wood-border)}.landing-hero{flex:1 1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 20px;background:linear-gradient(135deg,var(--blackboard-dark) 0,var(--blackboard-main) 50%,var(--blackboard-dark) 100%);position:relative}.landing-hero:before{content:"";position:absolute;top:20px;left:20px;right:20px;bottom:20px;border:3px solid var(--wood-main);border-radius:4px;pointer-events:none}.hero-icon{font-size:6rem;color:var(--chalk-yellow);margin-bottom:30px;text-shadow:0 0 30px rgba(255,217,61,.5);animation:chalkGlow 2s ease-in-out infinite alternate}.hero-logo{margin-bottom:30px;animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes chalkGlow{0%{text-shadow:0 0 10px rgba(255,217,61,.3)}to{text-shadow:0 0 40px rgba(255,217,61,.8)}}.hero-title{font-size:3.5rem;color:var(--chalk-white);margin-bottom:20px;text-shadow:2px 2px 4px rgba(0,0,0,.5)}.hero-subtitle,.hero-title{font-family:Patrick Hand,cursive}.hero-subtitle{font-size:1.4rem;color:var(--text-secondary);margin-bottom:40px;max-width:600px}.hero-motto{font-size:1.2rem;color:var(--chalk-yellow);margin-bottom:30px;font-family:Patrick Hand,cursive}.hero-cta{padding:18px 40px;background:linear-gradient(135deg,var(--saffron),var(--chalk-orange));border:3px solid var(--wood-border);border-radius:12px;color:var(--wood-dark);font-size:1.2rem;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:12px;transition:all .3s ease;box-shadow:5px 5px 0 var(--wood-border);text-decoration:none}.hero-cta:hover{transform:translate(-3px,-3px);box-shadow:8px 8px 0 var(--wood-border)}.landing-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));grid-gap:30px;gap:30px;padding:60px 40px;background:linear-gradient(180deg,var(--wood-dark),var(--wood-main))}.feature-card{background:rgba(0,0,0,.2);border:2px solid var(--chalk-white);border-radius:12px;padding:30px;text-align:center;transition:all .3s ease}.feature-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(0,0,0,.3)}.feature-icon{font-size:3rem;color:var(--chalk-yellow);margin-bottom:20px}.feature-title{font-size:1.3rem;font-family:Patrick Hand,cursive;color:var(--chalk-white);margin-bottom:10px}.feature-desc{color:var(--text-muted);font-size:.95rem}.landing-footer{padding:20px;text-align:center;background:var(--wood-dark);border-top:3px solid var(--wood-border);color:var(--chalk-yellow);font-family:Patrick Hand,cursive}.auth-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--blackboard-dark) 0,var(--blackboard-main) 50%,var(--blackboard-dark) 100%);padding:20px}.auth-box{background:linear-gradient(180deg,var(--wood-main),var(--wood-dark));border-radius:20px;padding:40px;width:100%;max-width:450px;border:4px solid var(--wood-border);box-shadow:0 20px 60px rgba(0,0,0,.5)}.auth-header{text-align:center;margin-bottom:30px}.auth-title{font-size:2rem;color:var(--chalk-white);margin-bottom:10px}.auth-subtitle,.auth-title{font-family:Patrick Hand,cursive}.auth-subtitle{color:var(--text-muted)}.dashboard-container{display:flex;height:100vh;overflow:hidden}.sidebar{width:320px;background:linear-gradient(180deg,var(--wood-dark) 0,var(--wood-main) 50%,var(--wood-dark) 100%);border-right:8px solid var(--wood-border);display:flex;flex-direction:column;position:relative;box-shadow:inset -5px 0 15px rgba(0,0,0,.3)}.sidebar:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-image:repeating-linear-gradient(90deg,transparent,transparent 2px,rgba(0,0,0,.1) 0,rgba(0,0,0,.1) 4px);pointer-events:none}.sidebar-header{padding:20px;border-bottom:3px solid var(--wood-border);background:linear-gradient(90deg,var(--saffron) 0,var(--chalk-white) 50%,var(--indian-green) 100%);justify-content:space-between}.logo,.sidebar-header{position:relative;display:flex;align-items:center}.logo{gap:12px;font-size:1.25rem;font-weight:700;color:var(--navy-blue);z-index:1}.logo i{font-size:1.8rem;color:var(--maroon)}.add-subject-btn{margin:16px;padding:14px 20px;background:linear-gradient(135deg,var(--saffron),var(--chalk-yellow));border-radius:8px;display:flex;align-items:center;gap:10px;cursor:pointer;transition:all .3s ease;font-weight:600;color:var(--wood-dark);border:2px solid var(--wood-border);box-shadow:3px 3px 0 var(--wood-border);position:relative;z-index:1}.add-subject-btn:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--wood-border)}.subjects-list{flex:1 1;overflow-y:auto;padding:8px;position:relative;z-index:1}.subject-item{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:8px;cursor:pointer;transition:all .2s ease;margin-bottom:8px;background:rgba(0,0,0,.2);border:2px solid transparent}.subject-item:hover{background:rgba(255,255,255,.1);border-color:var(--chalk-yellow)}.subject-item.active{background:rgba(255,153,51,.3);border:2px solid var(--saffron);box-shadow:0 0 10px rgba(255,153,51,.3)}.subject-item-avatar{width:48px;height:48px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;background:linear-gradient(135deg,var(--blackboard-main),var(--blackboard-dark));border:2px solid rgba(255,255,255,.3);box-shadow:2px 2px 5px rgba(0,0,0,.3)}.subject-item-info{flex:1 1;overflow:hidden}.subject-item-name{font-weight:600;margin-bottom:4px;color:var(--chalk-white)}.subject-item-name,.subject-item-preview{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.subject-item-preview{font-size:.85rem;color:var(--text-muted)}.sidebar-footer{padding:16px;text-align:center;border-top:3px solid var(--wood-border);color:var(--chalk-yellow);font-size:.85rem;font-family:Patrick Hand,cursive;position:relative;z-index:1;background:rgba(0,0,0,.2)}.chat-area{flex:1 1;display:flex;flex-direction:column;background:linear-gradient(135deg,var(--blackboard-dark) 0,var(--blackboard-main) 50%,var(--blackboard-dark) 100%);position:relative;height:100vh;overflow:hidden}.chat-area:before{top:0;left:0;right:0;bottom:0;background-image:radial-gradient(ellipse at 20% 30%,rgba(255,255,255,.03) 0,transparent 50%),radial-gradient(ellipse at 80% 70%,rgba(255,255,255,.02) 0,transparent 50%)}.chat-area:after,.chat-area:before{content:"";position:absolute;pointer-events:none}.chat-area:after{top:10px;left:10px;right:10px;bottom:10px;border:3px solid var(--wood-main);border-radius:4px;box-shadow:inset 0 0 30px rgba(0,0,0,.3)}.welcome-screen{flex:1 1;display:flex;align-items:center;justify-content:center;position:relative;z-index:1}.welcome-content{text-align:center;padding:40px}.welcome-content i{font-size:5rem;color:var(--chalk-yellow);margin-bottom:24px;text-shadow:0 0 20px rgba(255,217,61,.5)}.welcome-content h1{font-size:2.5rem;margin-bottom:12px;font-family:Patrick Hand,cursive;color:var(--chalk-white);text-shadow:2px 2px 4px rgba(0,0,0,.5)}.welcome-content p{color:var(--text-secondary);margin-bottom:32px;font-size:1.2rem;font-family:Patrick Hand,cursive}.welcome-content button{padding:16px 32px;background:linear-gradient(135deg,var(--saffron),var(--chalk-orange));border:3px solid var(--wood-border);border-radius:8px;color:var(--wood-dark);font-size:1.1rem;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:10px;transition:all .3s ease;box-shadow:4px 4px 0 var(--wood-border)}.welcome-content button:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--wood-border)}.chat-container{flex:1 1;display:flex;flex-direction:column;position:relative;z-index:1;height:100%;overflow:hidden}.chat-header{padding:16px 24px;background:linear-gradient(90deg,var(--wood-dark),var(--wood-main),var(--wood-dark));border-bottom:4px solid var(--wood-border);justify-content:space-between;box-shadow:0 4px 15px rgba(0,0,0,.3);flex-shrink:0;position:-webkit-sticky;position:sticky;top:0;z-index:10}.chat-header,.chat-header-info{display:flex;align-items:center}.chat-header-info{gap:14px}.subject-avatar{width:52px;height:52px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:2rem;background:linear-gradient(135deg,var(--blackboard-main),var(--blackboard-dark));border:3px solid var(--chalk-white);box-shadow:3px 3px 0 rgba(0,0,0,.3)}.subject-details h2{font-size:1.2rem;font-weight:600;margin-bottom:4px;color:var(--chalk-white)}.status,.subject-details h2{font-family:Patrick Hand,cursive}.status{display:flex;align-items:center;gap:6px;font-size:.9rem;color:var(--chalk-green)}.status-dot{width:10px;height:10px;background-color:var(--success-color);border-radius:50%;animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.7;transform:scale(1.2)}}.chat-header-actions{display:flex;gap:8px}.icon-btn{width:44px;height:44px;border:2px solid var(--chalk-white);background-color:rgba(0,0,0,.2);border-radius:8px;color:var(--chalk-white);cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.icon-btn:hover{background-color:rgba(255,255,255,.1);transform:scale(1.05)}.icon-btn.delete-btn:hover{background-color:rgba(255,118,117,.3);border-color:var(--danger-color);color:var(--danger-color)}.icon-btn.close-chat-btn:hover{background-color:rgba(255,255,255,.2);border-color:var(--chalk-white)}.chat-messages{flex:1 1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:16px;min-height:0}.message{display:flex;gap:12px;max-width:85%;animation:fadeIn .3s ease}.message.sent{align-self:flex-end;flex-direction:row-reverse}.message.received{align-self:flex-start}.message-avatar{width:40px;height:40px;border-radius:50%;background:var(--saffron);display:flex;align-items:center;justify-content:center;font-size:1.25rem;flex-shrink:0;box-shadow:2px 2px 8px rgba(0,0,0,.3)}.message-bubble{padding:14px 18px;border-radius:16px;font-size:1rem;line-height:1.7;position:relative}.message.sent .message-bubble{background:linear-gradient(135deg,var(--saffron),var(--chalk-orange));color:var(--wood-dark);border-bottom-right-radius:4px;box-shadow:3px 3px 0 rgba(0,0,0,.2)}.message.received .message-bubble{background:rgba(255,255,255,.08);color:var(--chalk-white);border:1px solid rgba(255,255,255,.15);border-bottom-left-radius:4px;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.message-content{word-wrap:break-word;overflow-wrap:break-word}.message-content strong{color:var(--chalk-yellow);font-weight:700}.message.sent .message-content strong{color:var(--wood-dark);font-weight:800}.message-content em{font-style:italic;opacity:.9}.message-content code{background:rgba(0,0,0,.3);padding:2px 6px;border-radius:4px;font-family:Courier New,monospace;font-size:.9rem}.message-content h1.msg-heading,.message-content h2.msg-heading,.message-content h3.msg-heading{color:var(--chalk-yellow);font-family:Patrick Hand,cursive;margin:12px 0 8px;border-bottom:1px dashed rgba(255,255,255,.2);padding-bottom:4px}.message-content h1.msg-heading{font-size:1.4rem}.message-content h2.msg-heading{font-size:1.25rem}.message-content h3.msg-heading{font-size:1.15rem}.message-content li{margin-left:20px;margin-bottom:4px;list-style:disc}.message-content hr{border:none;border-top:1px dashed rgba(255,255,255,.3);margin:12px 0}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-time{font-size:.7rem;color:rgba(255,255,255,.5);margin-top:6px;text-align:right;font-family:Poppins,sans-serif}.message.sent .message-time{color:rgba(93,64,55,.7)}.message.received .message-time{text-align:left}.typing-indicator{display:flex;gap:6px;padding:8px 0}.typing-indicator span{width:8px;height:8px;background-color:var(--chalk-white);border-radius:50%;animation:typing 1.4s ease-in-out infinite}.typing-indicator span:first-child{animation-delay:0s}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-6px)}}.chat-input-container{padding:20px 24px;background:linear-gradient(180deg,var(--wood-main),var(--wood-dark));border-top:6px solid var(--wood-border);box-shadow:0 -4px 15px rgba(0,0,0,.3);flex-shrink:0;position:-webkit-sticky;position:sticky;bottom:0;z-index:10}.chat-input-wrapper{display:flex;gap:12px;align-items:center;background:var(--blackboard-main);border-radius:12px;padding:8px 8px 8px 20px;border:3px solid var(--chalk-white);transition:all .2s ease;box-shadow:inset 0 2px 10px rgba(0,0,0,.3)}.chat-input-wrapper:focus-within{border-color:var(--chalk-yellow);box-shadow:0 0 15px rgba(255,217,61,.3),inset 0 2px 10px rgba(0,0,0,.3)}.chat-input-wrapper input{flex:1 1;background:none;border:none;color:var(--chalk-white);font-size:1.1rem;outline:none;font-family:Patrick Hand,cursive}.chat-input-wrapper input::placeholder{color:var(--text-muted);font-family:Patrick Hand,cursive}.send-btn{width:50px;height:50px;border:2px solid var(--wood-border);background:linear-gradient(135deg,var(--saffron),var(--chalk-orange));border-radius:10px;color:var(--wood-dark);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease;box-shadow:2px 2px 0 var(--wood-border)}.send-btn:hover{transform:translate(-1px,-1px);box-shadow:3px 3px 0 var(--wood-border)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:rgba(0,0,0,.8);display:flex;align-items:flex-start;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);overflow-y:auto;padding:20px;-webkit-overflow-scrolling:touch}.modal{background:linear-gradient(180deg,var(--wood-main),var(--wood-dark));border-radius:16px;width:100%;max-width:500px;box-shadow:0 20px 60px rgba(0,0,0,.5),0 0 0 6px var(--wood-border);animation:modalSlide .3s ease;margin:auto;max-height:none;flex-shrink:0}@keyframes modalSlide{0%{opacity:0;transform:translateY(-20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.modal-header{padding:20px 24px;background:linear-gradient(90deg,var(--saffron) 0,var(--chalk-white) 50%,var(--indian-green) 100%);border-radius:16px 16px 0 0;display:flex;align-items:center;justify-content:space-between}.modal-header h3{font-size:1.3rem;font-weight:700;color:var(--navy-blue)}.close-btn{width:40px;height:40px;border:2px solid var(--navy-blue);background-color:rgba(255,255,255,.3);border-radius:8px;color:var(--navy-blue);cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.close-btn:hover{background-color:rgba(255,0,0,.2);border-color:var(--danger-color);color:var(--danger-color)}.modal-body{padding:24px;background:var(--blackboard-main)}.form-row{display:grid;grid-template-columns:1fr 1fr;grid-gap:16px;gap:16px}.form-group{margin-bottom:20px}.form-group:last-child{margin-bottom:0}.form-group label{display:block;margin-bottom:10px;font-weight:600;color:var(--chalk-yellow);font-family:Patrick Hand,cursive;font-size:1.1rem}.form-group input[type=text],.form-group input[type=url],.form-group select{width:100%;padding:14px 16px;background-color:rgba(0,0,0,.3);border:2px solid var(--chalk-white);border-radius:8px;color:var(--chalk-white);font-size:1rem;transition:all .2s ease;font-family:Patrick Hand,cursive}.form-group select{cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%23fff' viewBox='0 0 24 24'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:24px;padding-right:40px}.form-group select option{background-color:#2d4a3e;color:white}.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--chalk-yellow);box-shadow:0 0 10px rgba(255,217,61,.3)}.form-group small{display:block;margin-top:8px;color:var(--text-muted);font-size:.9rem;font-family:Patrick Hand,cursive}.emoji-picker{display:flex;flex-wrap:wrap;gap:8px}.emoji-btn{width:48px;height:48px;font-size:1.5rem;border:2px solid var(--chalk-white);border-radius:8px;background:rgba(0,0,0,.2);cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.emoji-btn:hover{background:rgba(255,217,61,.2);border-color:var(--chalk-yellow);transform:scale(1.1)}.emoji-btn.selected{background:rgba(255,217,61,.3);border-color:var(--chalk-yellow);box-shadow:0 0 10px rgba(255,217,61,.4)}.color-picker{display:flex;align-items:center;gap:12px}.color-picker input[type=color]{width:60px;height:60px;border:3px solid var(--chalk-white);border-radius:8px;cursor:pointer;background:none}.modal-footer{padding:20px 24px;border-top:3px solid var(--wood-border);display:flex;gap:12px;justify-content:flex-end;background:linear-gradient(180deg,var(--wood-main),var(--wood-dark));border-radius:0 0 16px 16px}.btn{padding:14px 28px;border:2px solid var(--wood-border);border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;box-shadow:3px 3px 0 rgba(0,0,0,.2)}.btn-secondary{background:rgba(255,255,255,.1);color:var(--chalk-white);border-color:var(--chalk-white)}.btn-secondary:hover{background:rgba(255,255,255,.2)}.btn-primary{background:linear-gradient(135deg,var(--saffron),var(--chalk-orange));color:var(--wood-dark)}.btn-primary:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 rgba(0,0,0,.3)}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:var(--wood-dark)}::-webkit-scrollbar-thumb{background:var(--wood-main);border-radius:5px;border:2px solid var(--wood-dark)}.toast{position:fixed;bottom:24px;right:24px;padding:16px 24px;background:linear-gradient(135deg,var(--wood-main),var(--wood-dark));border-radius:8px;box-shadow:0 4px 20px rgba(0,0,0,.4);display:flex;align-items:center;gap:12px;z-index:2000;animation:slideIn .3s ease;border:2px solid var(--wood-border);color:var(--chalk-white);font-family:Patrick Hand,cursive;font-size:1.1rem}.toast.error{border-left:4px solid var(--danger-color)}.toast.success{border-left:4px solid var(--success-color)}@keyframes slideIn{0%{opacity:0;transform:translateX(100px)}to{opacity:1;transform:translateX(0)}}.loading-spinner{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--blackboard-dark)}.spinner{width:50px;height:50px;border:4px solid var(--chalk-white);border-top-color:var(--saffron);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.mobile-header{display:none;align-items:center;justify-content:space-between;padding:12px 16px;background:linear-gradient(180deg,var(--wood-main),var(--wood-dark));border-bottom:4px solid var(--wood-border);position:-webkit-sticky;position:sticky;top:0;z-index:50}.mobile-header .menu-btn{width:44px;height:44px;background:rgba(0,0,0,.2);border:2px solid rgba(255,255,255,.2);border-radius:8px;cursor:pointer;justify-content:center}.mobile-header .menu-btn,.mobile-logo{color:var(--chalk-white);font-size:1.25rem;display:flex;align-items:center}.mobile-logo{gap:8px;font-family:Patrick Hand,cursive}.mobile-logo span:first-child{font-size:1.5rem}.sidebar-overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);z-index:90}.close-sidebar-btn{display:none;width:36px;height:36px;background:transparent;border:none;color:var(--chalk-white);font-size:1.25rem;cursor:pointer}.empty-chat{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 20px;color:var(--chalk-white)}.empty-chat-icon{font-size:4rem;margin-bottom:20px;animation:bounce 2s infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.empty-chat h3{font-family:Patrick Hand,cursive;font-size:1.75rem;margin-bottom:10px;color:var(--chalk-yellow)}.empty-chat p{font-size:1rem;opacity:.8;margin-bottom:4px}.empty-chat .hint{font-size:.9rem;opacity:.6;font-style:italic}@media (max-width:900px){.sidebar{position:fixed;left:-320px;top:0;height:100%;z-index:100;transition:left .3s ease;box-shadow:4px 0 20px rgba(0,0,0,.5)}.sidebar.open{left:0}.sidebar-header .logo{display:none}.close-sidebar-btn{display:flex;align-items:center;justify-content:center}.mobile-header{display:flex}.sidebar-overlay{display:block}.chat-area{height:calc(100vh - 68px)}.dashboard-container{flex-direction:column}.message{max-width:90%}.chat-messages{padding:16px}.chat-header{padding:12px 16px}.chat-header-info h2{font-size:1rem}.subject-avatar{width:40px;height:40px;font-size:1.25rem}.chat-input-container{padding:12px 16px}.chat-input-wrapper{padding:6px 6px 6px 16px}.chat-input-wrapper input{padding:12px 0;font-size:1rem}.send-btn{width:44px;height:44px}.modal-overlay{padding:16px;align-items:flex-start}.modal{margin:0;max-width:100%;width:100%}.modal-body{max-height:none;overflow-y:visible}.hero-title{font-size:2.5rem}.landing-header{padding:15px 20px}.welcome-screen .welcome-content{padding:40px 20px}.welcome-screen .welcome-content i{font-size:3rem}.welcome-screen .welcome-content h1{font-size:1.75rem}}@media (max-width:480px){.message{max-width:95%}.message-bubble{padding:12px 14px;font-size:.95rem}.message-avatar{width:32px;height:32px;font-size:1rem}.chat-header-actions{gap:4px}.icon-btn{width:36px;height:36px}.form-row{grid-template-columns:1fr}.modal-body{padding:16px}.modal-header h3{font-size:1.1rem}}