@import"https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap";@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--primary: #d97757;--primary-hover: #c4654a;--primary-light: rgba(217, 119, 87, .12);--primary-glow: rgba(217, 119, 87, .25);--primary-glow-strong: rgba(217, 119, 87, .4);--accent-color: #d97757;--accent-color-hover: #c4654a;--bg-primary: #f9f9f9;--bg-secondary: #ffffff;--bg-tertiary: #f2f2f2;--bg-elevated: #ffffff;--text-primary: #111111;--text-secondary: #4A4A4A;--text-muted: #71717A;--text-inverse: #ffffff;--border-color: rgba(0, 0, 0, .12);--border-hover: rgba(0, 0, 0, .2);--surface-hover: rgba(0, 0, 0, .06);--surface-active: rgba(0, 0, 0, .08);--success: #16a34a;--success-bg: rgba(22, 163, 74, .1);--success-border: rgba(22, 163, 74, .3);--error: #dc2626;--error-bg: rgba(220, 38, 38, .1);--error-border: rgba(220, 38, 38, .3);--warning: #d97706;--warning-bg: rgba(217, 119, 6, .1);--warning-border: rgba(217, 119, 6, .3);--focus-ring: 0 0 0 3px rgba(217, 119, 87, .35);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .06);--shadow-lg: 0 8px 30px rgba(0, 0, 0, .08);--shadow-xl: 0 16px 48px rgba(0, 0, 0, .1);--glow-input: 0 0 0 3px rgba(217, 119, 87, .15), 0 8px 32px rgba(217, 119, 87, .1);--glow-btn: 0 4px 20px rgba(217, 119, 87, .35);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-7: 28px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--space-16: 64px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-2xl: 28px;--radius-full: 9999px;--font-family: "Outfit", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-hero: 44px;--font-h1: 32px;--font-h2: 24px;--font-h3: 18px;--font-body: 15px;--font-small: 13px;--font-xs: 11px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.16, 1, .3, 1);--sidebar-width: 260px;--sidebar-collapsed: 64px;--header-height: 56px;--chat-max-width: 960px;--user-msg-bg: var(--primary);--user-msg-text: #ffffff;--ai-msg-text: var(--text-primary);--bg-orange: #d97757;--text-black: var(--text-primary);--text-white: var(--bg-secondary);--text-gray: var(--text-secondary)}.dark-theme{--bg-primary: #0a0a0f;--bg-secondary: #131318;--bg-tertiary: #1e1e26;--bg-elevated: #18181f;--text-primary: #ECECF1;--text-secondary: #B4B4BF;--text-muted: #8E8EA0;--text-inverse: #111111;--border-color: rgba(255, 255, 255, .08);--border-hover: rgba(255, 255, 255, .14);--surface-hover: rgba(255, 255, 255, .06);--surface-active: rgba(255, 255, 255, .08);--success: #22c55e;--success-bg: rgba(34, 197, 94, .16);--success-border: rgba(34, 197, 94, .4);--error: #f87171;--error-bg: rgba(248, 113, 113, .16);--error-border: rgba(248, 113, 113, .4);--warning: #f59e0b;--warning-bg: rgba(245, 158, 11, .16);--warning-border: rgba(245, 158, 11, .4);--focus-ring: 0 0 0 3px rgba(217, 119, 87, .5);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 30px rgba(0, 0, 0, .5);--shadow-xl: 0 16px 48px rgba(0, 0, 0, .6);--glow-input: 0 0 0 3px rgba(217, 119, 87, .12), 0 8px 32px rgba(217, 119, 87, .08);--glow-btn: 0 4px 24px rgba(217, 119, 87, .45);--user-msg-bg: var(--primary);--user-msg-text: #ffffff;--ai-msg-text: var(--text-primary);--text-black: var(--text-primary);--text-white: var(--bg-secondary);--text-gray: var(--text-secondary);--bg-orange: #d97757}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{overflow-x:hidden;scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);font-size:var(--font-body);color:var(--text-primary);background-color:var(--bg-primary);min-height:100vh;line-height:1.6;transition:background-color var(--transition-base),color var(--transition-base)}a{color:inherit;text-decoration:none}button{font-family:var(--font-family);cursor:pointer}img{display:block;max-width:100%}ul,ol{list-style:none}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-16px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUpFade{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:.4}50%{opacity:1}}@keyframes dotBounce{0%,80%,to{transform:translateY(0)}40%{transform:translateY(-6px)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes gradientText{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}@keyframes logoGlow{0%,to{box-shadow:0 0 20px #d9775726,0 0 40px #d977570d}50%{box-shadow:0 0 28px #d9775740,0 0 56px #d977571a}}@keyframes subtlePulse{0%,to{box-shadow:0 4px 12px var(--primary-glow)}50%{box-shadow:0 4px 20px var(--primary-glow-strong)}}@keyframes borderGlow{0%,to{border-color:#d9775733}50%{border-color:#d9775766}}@keyframes messageEntry{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}body.app-page{display:block;height:100vh;overflow:hidden;background-color:var(--bg-primary)}.app-layout{display:flex;width:100%;height:100vh}.main-content-wrapper{flex:1;display:flex;flex-direction:column;min-width:0;height:100vh;background-color:var(--bg-primary);position:relative;transition:background-color var(--transition-base)}.main-sidebar{width:var(--sidebar-width);background-color:var(--bg-secondary);border-right:1px solid var(--border-color);display:flex;flex-direction:column;height:100vh;position:sticky;top:0;transition:width var(--transition-slow),background-color var(--transition-base);z-index:50;overflow-x:hidden;flex-shrink:0}@media(min-width:769px){.main-sidebar.collapsed{width:var(--sidebar-collapsed)}.main-sidebar.collapsed .sidebar-action{padding:var(--space-2) var(--space-2)}.main-sidebar.collapsed .new-chat-sidebar-btn{width:40px;height:40px;padding:0;justify-content:center;border-radius:var(--radius-full)}.main-sidebar.collapsed .new-chat-sidebar-btn .btn-text,.main-sidebar.collapsed .sidebar-scrollable{display:none}.main-sidebar.collapsed .sidebar-bottom{padding:var(--space-2)}.main-sidebar.collapsed .sidebar-nav-item{width:40px;height:40px;padding:0;justify-content:center;border-radius:var(--radius-full);margin:0 auto 4px}.main-sidebar.collapsed .sidebar-nav-item .item-text{display:none}.main-sidebar.collapsed .sidebar-top{justify-content:center;padding:var(--space-2)}}.sidebar-top{padding:var(--space-3) var(--space-3);display:flex;align-items:center;height:var(--header-height);flex-shrink:0}.menu-toggle-btn{width:40px;height:40px;border-radius:var(--radius-full);border:none;background:transparent;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;transition:background-color var(--transition-fast),color var(--transition-fast)}.menu-toggle-btn:hover{background-color:var(--surface-hover);color:var(--text-primary)}.menu-toggle-btn .material-symbols-outlined{font-size:22px}.sidebar-action{padding:var(--space-2) var(--space-3)}.new-chat-sidebar-btn{display:flex;align-items:center;gap:var(--space-3);background-color:transparent;border:1px solid var(--border-color);color:var(--text-primary);padding:var(--space-3) var(--space-4);border-radius:var(--radius-full);font-size:var(--font-small);font-weight:500;width:100%;transition:all var(--transition-fast);white-space:nowrap;overflow:hidden}.new-chat-sidebar-btn:hover{background-color:var(--surface-hover);border-color:var(--border-hover)}.new-chat-sidebar-btn .material-symbols-outlined{font-size:18px;color:var(--primary)}.sidebar-scrollable{flex:1;overflow-y:auto;overflow-x:hidden;padding:var(--space-3) 0;scrollbar-width:thin;scrollbar-color:var(--border-color) transparent}.sidebar-scrollable::-webkit-scrollbar{width:4px}.sidebar-scrollable::-webkit-scrollbar-track{background:transparent}.sidebar-scrollable::-webkit-scrollbar-thumb{background-color:var(--border-color);border-radius:10px}.sidebar-section{padding:0 var(--space-3);margin-bottom:var(--space-4)}.section-header{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);color:var(--text-muted)}.section-title{font-size:var(--font-xs);font-weight:600;text-transform:uppercase;letter-spacing:.5px;white-space:nowrap}.section-icon{font-size:16px!important}.sidebar-history-list{padding:0}.history-item{margin-bottom:1px;position:relative}.history-options-btn{position:absolute;right:4px;top:50%;transform:translateY(-50%);display:none;background:var(--bg-secondary);border:none;color:var(--text-muted);border-radius:var(--radius-sm);padding:2px;cursor:pointer;z-index:2}.history-item:hover .history-options-btn,.history-options-btn.active{display:flex;align-items:center;justify-content:center}.history-options-btn:hover{color:var(--text-primary)}.history-options-menu{position:absolute;top:calc(100% - 4px);right:8px;background:var(--bg-elevated);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);padding:var(--space-1) 0;min-width:150px;z-index:100;display:none;flex-direction:column}.history-options-menu.active{display:flex}.history-options-menu button{background:transparent;border:none;display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);color:var(--text-secondary);font-size:var(--font-small);font-family:inherit;cursor:pointer;text-align:left;width:100%}.history-options-menu button:hover{background:var(--surface-hover);color:var(--text-primary)}.history-options-menu button.delete-btn{color:#ef4444}.history-options-menu button.delete-btn:hover{background:#ef44440d}.history-link{display:flex;align-items:center;padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:var(--font-small);transition:all var(--transition-fast);padding-right:32px;white-space:nowrap;overflow:hidden}.history-link:hover{background-color:var(--surface-hover);color:var(--text-primary)}.history-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.sidebar-bottom{margin-top:auto;padding:var(--space-3);border-top:1px solid var(--border-color);flex-shrink:0}.sidebar-nav-item{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:var(--font-small);font-weight:500;transition:all var(--transition-fast);margin-bottom:2px;white-space:nowrap}.sidebar-nav-item:hover{background-color:var(--surface-hover);color:var(--text-primary)}.sidebar-nav-item.active{background-color:var(--primary-light);color:var(--primary)}.sidebar-nav-item .material-symbols-outlined{font-size:20px}@media(min-width:769px){.main-sidebar.collapsed .new-chat-sidebar-btn .btn-text,.main-sidebar.collapsed .section-title,.main-sidebar.collapsed .history-text,.main-sidebar.collapsed .sidebar-nav-item .item-text,.main-sidebar.collapsed .sidebar-history-list{display:none}}.sidebar-overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);z-index:999;opacity:0;transition:opacity var(--transition-base)}.sidebar-overlay.active{display:block;opacity:1}.header{background-color:var(--bg-primary);width:100%;height:var(--header-height);display:flex;justify-content:space-between;align-items:center;padding:0 var(--space-6);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:40;flex-shrink:0;transition:background-color var(--transition-base),border-color var(--transition-base)}.dark-theme .header{background-color:#0a0a0fbf;backdrop-filter:blur(16px) saturate(1.4);-webkit-backdrop-filter:blur(16px) saturate(1.4);border-bottom:1px solid rgba(255,255,255,.06)}.logo-container{display:flex;align-items:center;gap:var(--space-3);cursor:pointer;transition:opacity var(--transition-fast)}.logo-container:hover{opacity:.8}.logo-icon{width:36px;height:36px;object-fit:contain}.logo-text{font-size:18px;font-weight:700;letter-spacing:-.3px}.logo-sphinx{color:var(--text-primary)}.logo-sca,.logo-gpt{color:var(--primary)}.nav{display:flex;gap:var(--space-6);align-items:center}.nav-link{font-weight:500;color:var(--text-secondary);font-size:var(--font-small);padding:var(--space-2) 0;transition:color var(--transition-fast);text-transform:capitalize;position:relative}.nav-link:after{content:"";position:absolute;width:0;height:2px;bottom:0;left:50%;transform:translate(-50%);background-color:var(--primary);transition:width var(--transition-base);border-radius:1px}.nav-link:hover{color:var(--primary)}.study-mode-header-btn{background:var(--primary);color:#fff!important;padding:6px 16px;border-radius:var(--radius-full);font-weight:600;font-size:13px;transition:all var(--transition-fast);border:1px solid var(--primary);display:flex;align-items:center;gap:8px;animation:subtlePulse 3s ease-in-out infinite}.study-mode-header-btn:hover{background:var(--primary-hover);border-color:var(--primary-hover);transform:translateY(-1px);box-shadow:0 4px 20px var(--primary-glow-strong);animation:none}.credits-nav-badge{display:flex;align-items:center;gap:6px;padding:6px 14px;background:#d977571a;border:1px solid rgba(217,119,87,.25);border-radius:var(--radius-full);color:var(--primary);font-size:13px;font-weight:700;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap}.credits-nav-badge:hover{background:#d977572e;border-color:#d9775766;transform:translateY(-1px);box-shadow:0 2px 12px #d9775733}.nav-link:hover:after{width:100%}.mobile-menu-btn{display:none;background:none;border:none;color:var(--text-primary);cursor:pointer}.mobile-left-menu-btn{display:none;background:none;border:none;color:var(--text-primary);padding:var(--space-1);cursor:pointer;margin-right:var(--space-2)}.nav-theme-toggle{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:var(--radius-full);background:transparent;color:var(--text-secondary);border:1px solid var(--border-color);transition:all var(--transition-fast)}.nav-theme-toggle:hover{background-color:var(--surface-hover);color:var(--text-primary);border-color:var(--border-hover)}.nav-theme-toggle .material-symbols-outlined{font-size:18px}.profile-container{position:relative;display:none}.nav-profile{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:var(--radius-full);background:var(--primary);color:var(--text-inverse);font-weight:600;font-size:14px;border:2px solid var(--bg-primary);transition:transform var(--transition-fast),box-shadow var(--transition-fast);cursor:pointer;text-transform:uppercase;overflow:hidden}.nav-profile:hover{transform:scale(1.05);box-shadow:0 0 0 3px var(--primary-light)}.profile-dropdown{position:absolute;top:calc(100% + 8px);right:0;width:200px;background:var(--bg-elevated);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);padding:var(--space-2) 0;opacity:0;visibility:hidden;transform:translateY(-4px) scale(.98);transition:all var(--transition-base);border:1px solid var(--border-color);z-index:100}.profile-container:hover .profile-dropdown{opacity:1;visibility:visible;transform:translateY(0) scale(1)}.profile-dropdown:before{content:"";position:absolute;top:-6px;right:14px;width:12px;height:12px;background:var(--bg-elevated);transform:rotate(45deg);border-left:1px solid var(--border-color);border-top:1px solid var(--border-color)}.dropdown-item{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);color:var(--text-secondary);font-size:var(--font-small);font-weight:500;transition:all var(--transition-fast)}.dropdown-item:hover{background-color:var(--surface-hover);color:var(--text-primary)}.dropdown-item .material-symbols-outlined{font-size:18px}.dropdown-item.logout{color:#d97757}.dropdown-item.logout:hover{background-color:#ef44440f;color:#d97757}.dropdown-divider{height:1px;background-color:var(--border-color);margin:var(--space-1) 0}.hero{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:12px 40px 16px;text-align:left;transition:opacity var(--transition-slow),transform var(--transition-slow);overflow-y:auto;position:relative;z-index:1}.hero.animate-out{opacity:0;transform:translateY(-12px);pointer-events:none}#hero-calc-toggle,#chat-calc-toggle{padding:8px;min-width:40px;width:40px;height:40px;justify-content:center;border-radius:12px}.hero-content{width:100%;max-width:720px;display:flex;flex-direction:column;align-items:center;animation:fadeInUp .7s ease forwards}.hero-avatar-container,.hero-avatar,.pharaonic-line{display:none}.hero-brand-section{display:flex;flex-direction:column;align-items:center;text-align:center;width:100%;margin-top:0;margin-bottom:var(--space-3)}.hero-logo-circle{display:flex;align-items:center;justify-content:center;margin-bottom:var(--space-4);border-radius:var(--radius-full);width:88px;height:88px;background:radial-gradient(circle,rgba(217,119,87,.08) 0%,rgba(217,119,87,.02) 60%,transparent 100%);border:1.5px solid rgba(217,119,87,.2);animation:logoGlow 4s ease-in-out infinite;transition:all .3s ease;position:relative}.hero-logo-circle:after{content:"";position:absolute;top:4px;right:4px;bottom:4px;left:4px;border-radius:var(--radius-full);border:1px solid rgba(217,119,87,.08);pointer-events:none}.dark-theme .hero-logo-circle{background:radial-gradient(circle,rgba(217,119,87,.12) 0%,rgba(217,119,87,.04) 55%,transparent 100%);border-color:#d9775738}.hero-logo-circle:hover{animation:none;box-shadow:0 0 40px #d977574d,0 0 80px #d977571a;border-color:#d9775766;transform:scale(1.06)}.hero-logo-img{width:80px;height:80px;object-fit:contain;filter:drop-shadow(0 2px 12px rgba(217,119,87,.25));transition:filter .3s ease}.hero-logo-circle:hover .hero-logo-img{filter:drop-shadow(0 4px 16px rgba(217,119,87,.4))}.hero-title{font-size:34px!important;font-weight:600!important;letter-spacing:-.5px!important;margin-bottom:var(--space-2)!important;color:var(--text-primary)!important;animation:fadeInUp .7s ease .1s both!important}.hero-subtitle{font-size:17px!important;font-weight:400!important;color:var(--text-secondary)!important;margin-bottom:0!important;letter-spacing:-.2px;line-height:1.4;animation:fadeInUp .7s ease .18s both;margin-top:4px!important;opacity:.85}.gpt-tabs{display:flex;gap:var(--space-2);margin-bottom:var(--space-3);justify-content:center;width:100%;animation:fadeInUp .7s ease .22s both;background:var(--bg-tertiary);border-radius:var(--radius-full);padding:4px;width:fit-content}.gpt-tab{padding:8px 22px;border-radius:var(--radius-full);border:none;background:transparent;color:var(--text-secondary);font-size:14px;font-weight:500;transition:all .25s cubic-bezier(.4,0,.2,1);position:relative}.gpt-tab:hover{color:var(--text-primary);background:#ffffff0f}.gpt-tab.active{background:var(--primary);color:#fff;box-shadow:0 4px 16px var(--primary-glow),inset 0 1px #ffffff1f;transform:scale(1.02)}.hero-search-wrapper{width:100%;margin-bottom:var(--space-2);animation:fadeInUp .7s ease .26s both}.hero-search-wrapper .search-container{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);padding:0;box-shadow:none;transition:all var(--transition-base);overflow:hidden}.hero-search-wrapper .search-container:focus-within{box-shadow:0 0 0 2px var(--primary-light);border-color:var(--border-hover)}.hero-search-wrapper .search-input{padding:var(--space-4) var(--space-5) 0}.search-footer{display:flex;align-items:center;justify-content:space-between;padding:8px 16px 12px}.search-tools{display:flex;align-items:center;gap:10px}.search-actions{display:flex;align-items:center}.hero-search-wrapper .image-preview-wrapper{margin:var(--space-3) var(--space-5) 0}.suggestion-chips{display:flex;flex-wrap:wrap;gap:var(--space-2);justify-content:center;max-width:720px;margin-top:var(--space-3);animation:fadeInUp .7s ease .38s both}.suggestion-chip{display:flex;align-items:center;gap:var(--space-2);padding:10px 18px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);font-size:var(--font-small);font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);white-space:nowrap;position:relative;overflow:hidden}.dark-theme .suggestion-chip{background:#ffffff0a;border-color:#ffffff14}.suggestion-chip:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,rgba(217,119,87,.08),transparent);opacity:0;transition:opacity .2s ease}.suggestion-chip:hover{border-color:#d977574d;color:var(--text-primary);transform:translateY(-2px);box-shadow:0 4px 16px #d977571f}.suggestion-chip:hover:before{opacity:1}.suggestion-chip:active{transform:translateY(0) scale(.98)}.suggestion-chip .chip-icon{font-size:16px;color:var(--primary);position:relative;z-index:1}.suggestion-chip span:not(.chip-icon){position:relative;z-index:1}.main-send-btn,.send-btn{background:var(--primary)!important;color:#fff!important;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:none;cursor:pointer;transition:all .2s ease;padding:0}.main-send-btn:hover,.send-btn:hover{background:var(--primary-hover)!important;transform:scale(1.05)}.drop-zone{height:70px;background:#ffffff05;border-bottom:1px solid rgba(255,255,255,.05);width:100%;margin:0;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-base);z-index:1}.upload-content{display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center;opacity:.7}.drop-zone-icon{font-size:24px;color:var(--text-secondary)}.drop-zone-text{font-size:13px;color:var(--text-muted)}.click-link{color:var(--accent-color);cursor:pointer;font-weight:500}.click-link:hover{text-decoration:underline}.calc-icon-btn{width:38px;height:38px;border-radius:var(--radius-md);border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.calc-icon-btn:hover{background:var(--surface-hover);color:var(--text-primary);border-color:var(--border-hover)}.tool-pill-btn{display:flex;align-items:center;gap:6px;padding:0 16px;height:34px;border-radius:var(--radius-full);background:var(--surface-hover);border:1px solid var(--border-color);color:var(--text-secondary);font-size:13px;font-weight:500;transition:all var(--transition-fast);cursor:pointer}.tool-pill-btn:hover{background:var(--surface-active);border-color:var(--border-hover);color:var(--text-primary)}.tool-pill-btn span.material-symbols-outlined{font-size:20px}.mobile-promo-footer{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:var(--space-12);padding:10px 24px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-full);font-size:14px;color:var(--text-secondary);box-shadow:var(--shadow-sm);animation:fadeInUp .8s ease .5s both}.promo-icon{color:var(--primary);font-size:22px!important}.tool-pill-btn,.math-mode-btn{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;border-radius:var(--radius-full);border:1px solid var(--border-color);background:var(--surface-hover);color:var(--text-secondary);font-size:13px;font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.tool-pill-btn:hover,.math-mode-btn:hover{background:var(--surface-active);color:var(--text-primary);border-color:var(--border-hover)}.icon-button{width:34px;height:34px;display:flex;align-items:center;justify-content:center;border-radius:8px;border:1px solid rgba(255,255,255,.1);background:#ffffff0d;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast)}.icon-button:hover{background:#ffffff1f;color:var(--text-primary)}#hero-calc-toggle,#chat-calc-toggle{padding:6px;min-width:32px;width:32px;height:32px;justify-content:center;border-radius:var(--radius-sm)}.math-mode-btn .material-symbols-outlined,.tools-dropdown-btn .material-symbols-outlined{font-size:16px}.math-mode-btn.active{background:var(--primary-light);border-color:var(--primary);color:var(--primary)}.math-toolbar{display:none;flex-direction:column;gap:var(--space-2);background:var(--bg-secondary);border:1px solid 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14px;border-radius:var(--radius-full);border:none;background:transparent;color:var(--text-secondary);font-size:var(--font-small);font-weight:500;white-space:nowrap;cursor:pointer;transition:all var(--transition-fast);font-family:var(--font-family)}.math-tab:hover{background:var(--surface-hover);color:var(--text-primary)}.math-tab.active{background:var(--primary-light);color:var(--primary);font-weight:600}.math-symbols-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(52px,1fr));gap:4px;padding-top:var(--space-2)}.math-sym-btn{display:flex;align-items:center;justify-content:center;height:44px;border-radius:var(--radius-sm);border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);font-size:15px;font-family:"Cambria Math",Times New Roman,serif;cursor:pointer;transition:all var(--transition-fast)}.math-sym-btn:hover{background:var(--primary-light);border-color:var(--primary);color:var(--primary);transform:scale(1.05)}.floating-search-wrapper{position:relative;flex-shrink:0;display:flex;flex-direction:column;align-items:center;padding:0 var(--space-6) var(--space-6);background:transparent;z-index:100;pointer-events:none;overflow:visible}.unified-input-card{width:100%;max-width:800px;margin:0 auto;display:flex;flex-direction:column;position:relative;pointer-events:auto;transition:transform var(--transition-base)}.drop-zone{height:auto;padding:16px 0;width:calc(100% - 48px);margin:0 auto;background:transparent;border:1px dashed rgba(128,128,128,.3);border-bottom:none;border-radius:12px 12px 0 0;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-base);z-index:1}.drop-zone:hover{background:#8080800d}.input-content{background:var(--bg-secondary);color:var(--text-primary);padding:14px 18px;display:flex;flex-direction:column;border:1px solid rgba(128,128,128,.2);border-radius:18px;box-shadow:var(--shadow-lg);position:relative;z-index:2;transition:box-shadow var(--transition-base),border-color var(--transition-base)}.input-content:focus-within{border-color:#d9775759;box-shadow:var(--glow-input)}.dark-theme .input-content{background:#131318d9;border-color:#ffffff14;box-shadow:0 8px 32px #0006,inset 0 1px #ffffff0a}.dark-theme .input-content:focus-within{border-color:#d977574d;box-shadow:var(--glow-input),0 8px 32px #0006}.search-footer{display:flex;justify-content:space-between;align-items:center;margin-top:8px}.send-btn{width:40px;height:40px;border-radius:50%;background-color:var(--accent-color)!important;display:flex;align-items:center;justify-content:center;padding:0;min-width:40px;border:none;cursor:pointer;color:#fff;transition:all .2s 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var(--transition-fast)}.mode-dropdown-btn:hover{background:var(--surface-active);border-color:var(--border-hover);color:var(--text-primary)}.search-input{width:100%;background:transparent;border:none;resize:none;color:var(--text-primary);font-size:16px;font-family:inherit;line-height:1.5;max-height:200px;padding:0;margin-bottom:8px;outline:none}.search-container:focus-within{box-shadow:var(--shadow-xl);border-color:var(--primary)}.chat-disclaimer{font-size:var(--font-xs);color:var(--text-muted);margin-top:var(--space-3);text-align:center;pointer-events:auto;opacity:.7}.search-input{width:100%;border:none;background:transparent;font-family:var(--font-family);font-size:var(--font-body);font-weight:400;color:var(--text-primary);outline:none;resize:none;min-height:24px;max-height:180px;line-height:1.6;overflow-y:auto;scrollbar-width:none;padding:0}.search-input::-webkit-scrollbar{display:none}.search-input::placeholder{color:var(--text-muted);font-weight:400}.search-footer{display:flex;justify-content:space-between;align-items:center;gap:var(--space-4)}.search-tools{display:flex;align-items:center;gap:8px}.search-actions{display:flex;align-items:center;gap:12px}.circular-send{width:36px!important;height:36px!important;border-radius:50%!important;background-color:#3b82f6!important;display:flex!important;align-items:center!important;justify-content:center!important;padding:0!important;min-width:36px!important}.circular-send:hover{background-color:#2563eb!important;transform:scale(1.05)}.circular-send 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var(--transition-fast);outline:none;flex-shrink:0}.send-btn:hover{background:var(--primary-hover);transform:scale(1.05)}.send-btn:active{transform:scale(.92)}.send-btn:disabled{opacity:.5;cursor:default;transform:none}.send-icon{font-size:18px!important}.mode-dropdown{position:relative}.mode-dropdown-btn{display:flex;align-items:center;gap:var(--space-2);padding:6px var(--space-3);background:var(--surface-hover);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:var(--font-xs);font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.mode-dropdown-btn:hover{border-color:var(--border-hover);color:var(--text-primary)}.mode-dropdown-btn .dropdown-icon{color:var(--primary);font-variation-settings:"FILL" 1}.mode-dropdown-btn .material-symbols-outlined{font-size:16px}.mode-dropdown-btn .material-symbols-outlined:last-child{font-size:14px;opacity:.6}.mode-dropdown-menu{position:absolute;bottom:calc(100% + 8px);right:0;min-width:180px;background:var(--bg-elevated);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-2);box-shadow:var(--shadow-xl);display:none;flex-direction:column;z-index:1000}.mode-dropdown-menu.active{display:flex;animation:slideUp .2s ease}.mode-option{padding:var(--space-3);border-radius:var(--radius-sm);display:flex;align-items:center;gap:var(--space-3);color:var(--text-secondary);font-size:var(--font-small);font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.mode-option:hover{background:var(--surface-hover);color:var(--text-primary)}.mode-option.active{background:var(--primary-light);color:var(--primary)}.mode-option .material-symbols-outlined{font-size:18px}.chat-interface{flex:1;display:flex;flex-direction:column;width:100%;max-width:var(--chat-max-width);margin:0 auto;padding:var(--space-8) var(--space-5) var(--space-4);animation:fadeIn .4s 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var(--border-color);position:relative}.ai-message .message-content{background:transparent;padding-top:var(--space-1);max-width:90%}.ai-name{font-size:var(--font-xs);font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--primary);margin-bottom:var(--space-2);opacity:.9}.text-body{white-space:pre-wrap;word-break:break-word;font-size:var(--font-body);line-height:1.75;letter-spacing:-.01em;color:var(--text-primary)}.ai-message .message-content strong{font-weight:700;color:var(--text-primary)}.inline-code{background:var(--bg-tertiary);padding:2px 6px;border-radius:4px;font-family:SF Mono,Fira Code,Cascadia Code,monospace;font-size:.88em;color:var(--primary)}.code-block{background:#1e1e1e;color:#d4d4d4;padding:var(--space-4);border-radius:var(--radius-md);margin:var(--space-3) 0;overflow-x:auto;font-family:SF Mono,Fira Code,Cascadia Code,monospace;font-size:13px;line-height:1.6;border:1px solid rgba(255,255,255,.06)}.error-message .text-body{color:#ef4444;font-size:var(--font-small);font-weight:500;background:#ef44440f;padding:var(--space-3) var(--space-4);border-radius:var(--radius-sm);border-left:3px solid #ef4444}.typing-indicator .message-content{display:flex;align-items:center;gap:var(--space-1);padding:var(--space-3) 0}.typing-indicator p{color:var(--text-muted);font-size:var(--font-small);margin:0;animation:pulse 1.5s infinite}.typing-dots{display:flex;gap:4px;padding:var(--space-3) 0}.typing-dots span{width:6px;height:6px;background:var(--text-muted);border-radius:var(--radius-full);animation:dotBounce 1.4s ease-in-out infinite}.typing-dots span:nth-child(2){animation-delay:.16s}.typing-dots span:nth-child(3){animation-delay:.32s}.message-image{max-width:100%;max-height:280px;border-radius:var(--radius-md);margin-bottom:var(--space-2);cursor:pointer;box-shadow:var(--shadow-sm);transition:transform var(--transition-fast)}.message-image:hover{transform:scale(1.01)}.message-file-card{display:inline-flex;align-items:center;gap:10px;max-width:280px;padding:12px 14px;margin-bottom:var(--space-2);border-radius:var(--radius-md);border:1px solid var(--border-color);background:var(--bg-elevated);color:var(--text-primary);text-decoration:none;box-shadow:var(--shadow-sm)}.message-file-card .material-symbols-outlined{color:var(--primary)}.user-message.has-image .message-content{background:transparent!important;box-shadow:none!important;border:none!important;padding:0!important;display:flex;flex-direction:column;align-items:flex-end}.user-message.has-image .text-body{background:var(--user-msg-bg);padding:var(--space-3) var(--space-4);border-radius:var(--radius-xl) var(--radius-sm) var(--radius-xl) var(--radius-xl);margin-top:var(--space-2);display:inline-block;color:var(--user-msg-text);max-width:80%}.image-preview-wrapper{display:none;padding:var(--space-2);align-items:center;position:relative;width:fit-content}.image-preview-thumbnail{width:56px!important;height:56px!important;border-radius:var(--radius-sm);object-fit:cover;border:1px solid var(--border-color)}.remove-preview-btn{position:absolute;top:0;right:0;background:#000000b3;color:#fff;border:none;border-radius:var(--radius-full);width:18px;height:18px;font-size:12px;cursor:pointer;display:flex;align-items:center;justify-content:center;line-height:1;z-index:10;transition:all var(--transition-fast)}.remove-preview-btn:hover{background:#000;transform:scale(1.1)}.file-preview-card{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--bg-secondary, #1a1a2e);border:1px solid var(--border-color, #2a2a3e);border-radius:12px;min-width:180px;max-width:260px;position:relative;animation:fileCardIn .25s cubic-bezier(.4,0,.2,1)}@keyframes fileCardIn{0%{opacity:0;transform:scale(.92) translateY(4px)}to{opacity:1;transform:scale(1) translateY(0)}}.file-preview-card-icon{width:40px;height:40px;min-width:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;background:linear-gradient(135deg,var(--primary, #ff7b5c),#ff5733);box-shadow:0 2px 8px #ff7b5c4d}.file-preview-card-icon.pdf{background:linear-gradient(135deg,#ef4444,#dc2626);box-shadow:0 2px 8px #ef44444d}.file-preview-card-icon.doc{background:linear-gradient(135deg,#3b82f6,#2563eb);box-shadow:0 2px 8px #3b82f64d}.file-preview-card-icon.xls{background:linear-gradient(135deg,#22c55e,#16a34a);box-shadow:0 2px 8px #22c55e4d}.file-preview-card-icon.ppt{background:linear-gradient(135deg,#f97316,#ea580c);box-shadow:0 2px 8px #f973164d}.file-preview-card-icon.txt{background:linear-gradient(135deg,#8b5cf6,#7c3aed);box-shadow:0 2px 8px #8b5cf64d}.file-preview-card-icon.code{background:linear-gradient(135deg,#06b6d4,#0891b2);box-shadow:0 2px 8px #06b6d44d}.file-preview-card-info{display:flex;flex-direction:column;gap:2px;overflow:hidden;flex:1}.file-preview-card-name{font-size:13px;font-weight:600;color:var(--text-primary, #eee);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.3}.file-preview-card-meta{font-size:11px;color:var(--text-muted, #888);display:flex;align-items:center;gap:6px}.file-preview-card-ext{text-transform:uppercase;font-weight:700;letter-spacing:.5px;font-size:10px;padding:1px 5px;border-radius:4px;background:#ffffff14;color:var(--text-secondary, #aaa)}.image-preview-wrapper:has(.file-preview-card) .image-preview-thumbnail{display:none!important}.auth-modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:none;align-items:center;justify-content:center;z-index:9999;animation:fadeIn .2s ease}.auth-modal-content{background:var(--bg-elevated);padding:var(--space-12) var(--space-10);border-radius:var(--radius-xl);width:90%;max-width:440px;text-align:center;box-shadow:var(--shadow-xl);border:1px solid var(--border-color);animation:fadeInUp .3s ease}.modal-icon{width:56px;height:56px;background:var(--primary-light);color:var(--primary);border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;margin:0 auto var(--space-6)}.modal-icon .material-symbols-outlined{font-size:28px}.auth-modal-content h2{font-size:var(--font-h2);font-weight:700;color:var(--text-primary);margin-bottom:var(--space-3)}.auth-modal-content p{font-size:var(--font-body);color:var(--text-secondary);line-height:1.6;margin-bottom:var(--space-8)}.modal-actions{display:flex;gap:var(--space-3)}.modal-btn{flex:1;height:48px;border-radius:var(--radius-md);font-weight:600;font-size:var(--font-body);cursor:pointer;transition:all var(--transition-fast);border:none;outline:none}.login-modal-btn{background:var(--bg-tertiary);color:var(--text-primary)}.login-modal-btn:hover{background:var(--surface-active)}.signup-modal-btn{background:var(--primary);color:#fff}.signup-modal-btn:hover{background:var(--primary-hover);transform:translateY(-1px)}.coming-soon-modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:none;align-items:center;justify-content:center;z-index:9999;animation:fadeIn .2s ease}.coming-soon-modal-content{background:var(--bg-elevated);padding:var(--space-12) var(--space-10);border-radius:var(--radius-xl);width:90%;max-width:400px;text-align:center;box-shadow:var(--shadow-xl);border:1px solid var(--border-color);animation:fadeInUp .3s 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var(--border-color);display:flex;align-items:center;justify-content:flex-end}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border-color)}.calc-btn{background:var(--bg-secondary);border:none;color:var(--text-primary);font-size:18px;padding:18px;cursor:pointer;transition:background var(--transition-fast);font-family:var(--font-family)}.calc-btn:hover{background:var(--surface-hover)}.calc-btn:active{background:var(--surface-active)}.calc-btn.op{color:var(--primary);font-weight:600}.calc-btn.func{background:var(--bg-tertiary);color:var(--text-secondary);font-weight:500}.calc-btn.equals{background:var(--primary);color:#fff;font-weight:600}.calc-btn.equals:hover{background:var(--primary-hover)}.calc-body{overflow:hidden}#graphCalc iframe{border-radius:0;display:block}.tools-wrapper{position:relative;display:inline-flex}.tools-dropdown{position:absolute;bottom:calc(100% + 8px);left:0;background:var(--bg-elevated);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-2);display:none;flex-direction:column;gap:2px;min-width:200px;box-shadow:var(--shadow-xl);z-index:200}.tools-dropdown.open{display:flex;animation:slideUp .15s ease}.tools-dropdown button{background:transparent;border:none;color:var(--text-secondary);padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);cursor:pointer;text-align:left;font-size:var(--font-small);font-family:var(--font-family);transition:all var(--transition-fast);display:flex;align-items:center;gap:var(--space-2)}.tools-dropdown button:hover{background:var(--surface-hover);color:var(--text-primary)}.tools-dropdown button .material-symbols-outlined{font-size:18px}.graph-mode-badge{display:none;align-items:center;gap:8px;padding:6px 12px;margin-bottom:8px;background:linear-gradient(135deg,#e9456014,#e945600a);border:1px solid rgba(233,69,96,.2);border-radius:var(--radius-md);color:var(--primary);font-size:13px;font-weight:600;animation:graphBadgeIn .3s cubic-bezier(.34,1.56,.64,1)}@keyframes graphBadgeIn{0%{opacity:0;transform:translateY(8px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.graph-mode-badge .material-symbols-outlined{color:var(--primary)}.graph-mode-close{cursor:pointer;border:none;background:transparent;color:var(--text-muted);padding:2px;margin-left:auto;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.graph-mode-close:hover{background:#e945601f;color:var(--primary)}.graph-mode-input{border-color:#e945604d!important;box-shadow:0 0 0 2px #e945600f!important;font-family:JetBrains Mono,Fira Code,Courier New,monospace!important}.graph-mode-input::placeholder{color:#e9456066!important;font-family:JetBrains Mono,Fira Code,Courier New,monospace!important}.tool-pill-btn.active{background:#e945601f!important;border-color:#e945604d!important;color:var(--primary)!important}.tool-pill-btn.active .material-symbols-outlined{color:var(--primary)!important}.graph-equation-label{display:flex;align-items:center;gap:8px;padding:10px 14px;font-size:14px;font-family:JetBrains Mono,Fira Code,Courier New,monospace;color:var(--primary);font-weight:600;background:linear-gradient(135deg,#e945600f,#e9456005);border-radius:var(--radius-md) var(--radius-md) 0 0;border-bottom:1px solid rgba(233,69,96,.1)}.graph-equation-label .material-symbols-outlined{color:var(--primary);opacity:.8}.graph-container-wrapper{position:relative;border-radius:0 0 var(--radius-lg) var(--radius-lg);overflow:hidden;border:1px solid var(--border-color);border-top:none;background:#fff}.dark-theme .graph-container-wrapper{background:#f8f8f8}.graph-loading{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;background:#fffffff2;z-index:10;color:var(--text-muted);font-size:13px;font-weight:500}.dark-theme .graph-loading{background:#f8f8f8f2;color:#666}.graph-loading-spinner{width:32px;height:32px;border:3px solid rgba(233,69,96,.15);border-top-color:var(--primary);border-radius:50%;animation:spin .9s linear infinite}.unified-input-card:has(.graph-mode-input){border-color:#e9456040!important;box-shadow:0 0 20px #e945600f,var(--shadow-lg)!important}.hero-disclaimer{text-align:center;font-size:var(--font-xs);color:var(--text-muted);margin:var(--space-2) 0 0;-webkit-user-select:none;user-select:none;opacity:.7;width:100%}.chat-attach-btn-hidden{display:none!important}.katex,.katex-display,.katex-html,.math{direction:ltr!important;unicode-bidi:normal!important}.katex-display{text-align:center!important}