:root{--color-primary: #2563eb;--color-primary-light: #3b82f6;--color-primary-dark: #1d4ed8;--color-primary-hover: #1e40af;--color-primary-ghost: rgba(37, 99, 235, .12);--color-secondary: #9ca3af;--color-accent: #111827;--color-bg-main: #f3f4f6;--color-bg-gradient: linear-gradient(180deg, #f8fafc 0%, #eef2f7 100%);--color-surface: #FFFFFF;--color-surface-elevated: #f9fafb;--color-text-primary: #111827;--color-text-secondary: #374151;--color-text-muted: #6b7280;--color-text-inverse: #FFFFFF;--color-text: var(--color-text-primary);--color-success: #48BB78;--color-warning: #ED8936;--color-error: #F56565;--color-info: #4299E1;--color-border: rgba(17, 24, 39, .12);--color-border-focus: var(--color-primary);--shadow-sm: 0 2px 4px rgba(17, 24, 39, .05);--shadow-md: 0 4px 12px rgba(17, 24, 39, .08);--shadow-lg: 0 8px 24px rgba(17, 24, 39, .12);--shadow-xl: 0 16px 48px rgba(17, 24, 39, .16);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 2rem;--font-size-4xl: 2.5rem;--font-size-5xl: 3.5rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--font-weight-extrabold: 800;--spacing-1: .25rem;--spacing-2: .5rem;--spacing-3: .75rem;--spacing-4: 1rem;--spacing-5: 1.25rem;--spacing-6: 1.5rem;--spacing-8: 2rem;--spacing-10: 2.5rem;--spacing-12: 3rem;--spacing-16: 4rem;--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease;--z-dropdown: 100;--z-modal: 200;--z-toast: 300}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-family);font-size:var(--font-size-base);font-weight:var(--font-weight-normal);line-height:1.6;color:var(--color-text-primary);background:var(--color-bg-gradient);min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{min-height:100vh;position:relative}h1,h2,h3,h4,h5,h6{font-weight:var(--font-weight-bold);line-height:1.2;color:var(--color-text-primary)}h1{font-size:var(--font-size-4xl)}h2{font-size:var(--font-size-3xl)}h3{font-size:var(--font-size-2xl)}h4{font-size:var(--font-size-xl)}h5{font-size:var(--font-size-lg)}h6{font-size:var(--font-size-base)}.text-gradient{color:#111;background:none;-webkit-text-fill-color:currentColor}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-6)}.page{padding:var(--spacing-8) 0;animation:fadeIn var(--transition-slow) ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.card{background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:var(--spacing-6);border:1px solid var(--color-border);transition:transform var(--transition-base),box-shadow var(--transition-base)}.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-4)}.card-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);color:var(--color-text-primary)}.card-content{color:var(--color-text-secondary)}.feature-card{background:var(--color-surface);border-radius:var(--radius-xl);padding:var(--spacing-8);box-shadow:var(--shadow-lg);border:1px solid var(--color-border);position:relative;overflow:hidden}.feature-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--color-primary)}.feature-card-icon{width:48px;height:48px;background:#eaf1ff;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;margin-bottom:var(--spacing-4);color:var(--color-primary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-2);padding:var(--spacing-3) var(--spacing-6);font-family:var(--font-family);font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);border-radius:var(--radius-md);border:none;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap}.btn:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.btn-primary{background:var(--color-primary);color:var(--color-text-inverse);box-shadow:var(--shadow-sm)}.btn-primary:hover{transform:translateY(-1px);background:var(--color-primary-dark);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--color-surface);color:var(--color-text-secondary);border:1px solid var(--color-border)}.btn-secondary:hover{background:var(--color-bg-main);border-color:var(--color-primary-light);color:var(--color-primary-dark)}.btn-ghost{background:transparent;color:var(--color-text-secondary)}.btn-ghost:hover{background:var(--color-bg-main);color:var(--color-primary)}.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--radius-full)}.btn-lg{padding:var(--spacing-4) var(--spacing-8);font-size:var(--font-size-lg)}.btn-sm{padding:var(--spacing-2) var(--spacing-4);font-size:var(--font-size-sm)}.form-group{margin-bottom:var(--spacing-4)}.form-label{display:block;font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-text-primary);margin-bottom:var(--spacing-2)}.form-input{width:100%;padding:var(--spacing-3) var(--spacing-4);font-family:var(--font-family);font-size:var(--font-size-base);color:var(--color-text-primary);background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-md);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.form-input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-ghost)}.form-input::placeholder{color:var(--color-text-muted)}.navbar{background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--color-border);padding:var(--spacing-4) 0;position:sticky;top:0;z-index:var(--z-dropdown)}.navbar-content{display:flex;align-items:center;justify-content:space-between}.navbar-brand{display:flex;align-items:center;gap:var(--spacing-3);text-decoration:none}.flowtalk-wordmark{color:#111;font-weight:800;letter-spacing:-.03em;line-height:1;display:inline-block;font-family:"Sequel 100 Wide","Sequel 100",Open Sans,sans-serif}.navbar-wordmark{font-size:2rem}.hero-wordmark{font-size:clamp(3rem,9vw,6rem)}.dashboard-wordmark{font-size:2.2rem}.navbar-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-extrabold);color:#111;letter-spacing:-.02em}.navbar-nav{display:flex;align-items:center;gap:var(--spacing-2);list-style:none}.nav-link{padding:var(--spacing-2) var(--spacing-4);font-weight:var(--font-weight-medium);color:var(--color-text-secondary);text-decoration:none;border-radius:var(--radius-md);transition:all var(--transition-fast)}.nav-link:hover,.nav-link.active{color:var(--color-primary);background:var(--color-primary-ghost)}.navbar-actions{display:flex;align-items:center;gap:var(--spacing-3)}.navbar-user-email{font-size:var(--font-size-sm);color:var(--color-text-muted);max-width:260px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.modal-overlay{position:fixed;inset:0;background:#11182773;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:var(--z-modal);animation:fadeIn var(--transition-fast) ease}.modal{background:var(--color-surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);width:100%;max-width:500px;max-height:90vh;overflow-y:auto;animation:slideUp var(--transition-base) ease}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-6);border-bottom:1px solid var(--color-border)}.modal-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold)}.modal-body{padding:var(--spacing-6)}.modal-footer{display:flex;justify-content:flex-end;gap:var(--spacing-3);padding:var(--spacing-6);border-top:1px solid var(--color-border)}.student-node{position:absolute;width:60px;height:60px;background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-dark) 100%);border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;color:var(--color-text-inverse);font-weight:var(--font-weight-semibold);font-size:var(--font-size-sm);cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast);box-shadow:var(--shadow-md);-webkit-user-select:none;user-select:none;z-index:10}.student-node:hover{transform:scale(1.1);box-shadow:var(--shadow-lg)}.student-node.selected{box-shadow:0 0 0 4px var(--color-primary-light),var(--shadow-lg);transform:scale(1.15)}.student-node.active{animation:pulse .5s ease}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.2)}}.student-node-label{position:absolute;bottom:-24px;left:50%;transform:translate(-50%);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);color:var(--color-text-primary);white-space:nowrap;background:var(--color-surface);padding:2px 8px;border-radius:var(--radius-sm);box-shadow:var(--shadow-sm)}.discussion-canvas{position:relative;width:100%;height:500px;background:var(--color-surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);overflow:hidden}.discussion-canvas svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.discussion-line{fill:none;stroke:var(--color-primary);stroke-width:2;stroke-linecap:round;opacity:.7;animation:drawLine .3s ease forwards}@keyframes drawLine{0%{stroke-dasharray:1000;stroke-dashoffset:1000}to{stroke-dasharray:1000;stroke-dashoffset:0}}.stats-card{background:var(--color-surface);border-radius:var(--radius-lg);padding:var(--spacing-5);box-shadow:var(--shadow-sm);border-left:4px solid var(--color-primary)}.stats-value{font-size:var(--font-size-3xl);font-weight:var(--font-weight-extrabold);color:var(--color-primary)}.stats-label{font-size:var(--font-size-sm);color:var(--color-text-muted);margin-top:var(--spacing-1)}.wave-container{position:relative;overflow:hidden}.wave{position:absolute;bottom:0;left:0;width:200%;height:100px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120' preserveAspectRatio='none'%3E%3Cpath d='M321.39,56.44c58-10.79,114.16-30.13,172-41.86,82.39-16.72,168.19-17.73,250.45-.39C823.78,31,906.67,72,985.66,92.83c70.05,18.48,146.53,26.09,214.34,3V0H0V27.35A600.21,600.21,0,0,0,321.39,56.44Z' fill='%232563EB' fill-opacity='0.3'/%3E%3C/svg%3E");background-size:50% 100px;animation:wave 10s linear infinite}.wave:nth-child(2){bottom:10px;opacity:.5;animation-delay:-5s;animation-duration:15s}@keyframes wave{0%{transform:translate(0)}to{transform:translate(-50%)}}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-2{gap:var(--spacing-2)}.gap-4{gap:var(--spacing-4)}.gap-6{gap:var(--spacing-6)}.gap-8{gap:var(--spacing-8)}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.mt-2{margin-top:var(--spacing-2)}.mt-4{margin-top:var(--spacing-4)}.mt-6{margin-top:var(--spacing-6)}.mt-8{margin-top:var(--spacing-8)}.mb-2{margin-bottom:var(--spacing-2)}.mb-4{margin-bottom:var(--spacing-4)}.mb-6{margin-bottom:var(--spacing-6)}.mb-8{margin-bottom:var(--spacing-8)}.w-full{width:100%}.h-full{height:100%}.hidden{display:none}.visible{display:block}.grid{display:grid;gap:var(--spacing-6)}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media(max-width:768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.container{padding:0 var(--spacing-4)}h1{font-size:var(--font-size-3xl)}h2{font-size:var(--font-size-2xl)}}.empty-state{text-align:center;padding:var(--spacing-12);color:var(--color-text-muted)}.empty-state-icon{width:64px;height:64px;margin:0 auto var(--spacing-4);opacity:.5}.empty-state-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);color:var(--color-text-secondary);margin-bottom:var(--spacing-2)}.toast-container{position:fixed;bottom:var(--spacing-6);right:var(--spacing-6);z-index:var(--z-toast);display:flex;flex-direction:column;gap:var(--spacing-3)}.toast{background:var(--color-surface);padding:var(--spacing-4) var(--spacing-6);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);display:flex;align-items:center;gap:var(--spacing-3);animation:slideIn var(--transition-base) ease;min-width:300px}@keyframes slideIn{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}.toast-success{border-left:4px solid var(--color-success)}.toast-error{border-left:4px solid var(--color-error)}.toast-info{border-left:4px solid var(--color-info)}