:root{--bg-color: #fcfcfc;--text-color: #2b303a;--text-light: #5a6473;--primary-color: #1a365d;--secondary-color: #264653;--accent-color: #e76f51;--link-color: #457b9d;--link-hover: #e76f51;--border-color: #e2e8f0;--font-serif: "Playfair Display", serif;--font-sans: "Roboto", sans-serif}*{box-sizing:border-box}body{font-family:var(--font-sans);margin:0;padding:0;background-color:var(--bg-color);color:var(--text-color);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}h1,h2,h3{font-family:var(--font-serif);color:var(--primary-color);font-weight:600;letter-spacing:0}h1{font-size:2.2rem;margin:0 0 .5rem}a{color:var(--link-color);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;transition:color .2s ease,text-decoration-color .2s ease}a:hover{color:var(--link-hover);text-decoration-color:var(--link-hover)}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:progress;opacity:.7}header{background:#fcfcfcf2;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:1000;border-bottom:1px solid var(--border-color);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);padding:1rem 2rem}.header-brand{font-family:var(--font-serif);font-size:1.3rem;font-weight:600;color:var(--primary-color);text-decoration:none}.header-brand:hover{color:var(--secondary-color);text-decoration:none}nav ul{list-style:none;margin:0;padding:0;display:flex;gap:1.5rem}nav ul li a{color:var(--text-color);text-decoration:none;font-size:.95rem;font-weight:500}nav ul li a:hover{color:var(--link-hover)}.header-social{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;color:var(--text-light);transition:color .2s ease}.header-social:hover{color:var(--link-hover)}.header-social svg{width:20px;height:20px;fill:currentColor}.app-main,.workspace-main{width:min(1120px,calc(100% - 3rem));margin:0 auto;padding:2rem 0 4rem}.workspace-main{width:min(1320px,calc(100% - 3rem))}.app-title-band{display:flex;align-items:center;justify-content:space-between;gap:1.25rem;margin:1rem 0 2rem;padding:1.75rem 2rem;background:#fff;border:1px solid var(--border-color);border-radius:8px;box-shadow:0 4px 20px #0000000d}.app-logo{width:58px;height:58px;display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;border:1px solid var(--border-color);border-radius:8px;color:var(--primary-color);background:#f8fafc}.app-logo svg{width:28px;height:28px}.app-title-copy{flex:1;min-width:0}.app-title-copy h1{font-size:2.4rem}.lock-panel,.panel,.subject-panel,.review-panel{background:#fff;border:1px solid var(--border-color);border-radius:8px;box-shadow:0 4px 20px #0000000d}.lock-panel{max-width:480px;margin:0 auto 2rem;padding:2rem}.unlock-form,.create-session-panel,.subject-editor,.review-panel{display:grid;gap:.85rem}.form-heading,.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:.5rem}.form-heading{justify-content:flex-start}.form-heading svg,.panel-heading svg{width:20px;height:20px}.form-heading h2,.panel-heading h2{display:inline-flex;align-items:center;gap:.5rem;margin:0;font-size:1.35rem}.admin-grid{display:grid;grid-template-columns:minmax(280px,380px) minmax(0,1fr);gap:1.5rem}.panel,.subject-panel,.review-panel{padding:1.5rem}.subject-bank-panel{grid-column:1 / -1}.subject-bank-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:1rem}.subject-list,.session-list{display:grid;gap:.75rem}.subject-list{align-content:start;max-height:420px;overflow:auto}.subject-list-item{width:100%;min-height:38px;border:1px solid var(--border-color);border-radius:6px;background:#f8fafc;color:var(--text-color);padding:.65rem .75rem;text-align:left;font-weight:700}.subject-list-item.is-active{border-color:var(--primary-color);color:var(--primary-color);background:#fff}.session-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.9rem;border:1px solid var(--border-color);border-radius:6px;background:#f8fafc}.session-row-main{display:grid;min-width:0}.session-row-main strong,.session-row-main span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.session-row-main span,.empty-state{color:var(--text-light);font-size:.92rem}.select-input{width:100%;min-height:44px;color:var(--text-color);background:#fff;border:1px solid var(--border-color);border-radius:6px;padding:0 .8rem;outline:none}.text-area{width:100%;min-height:120px;color:var(--text-color);background:#fff;border:1px solid var(--border-color);border-radius:6px;padding:.8rem;resize:vertical;outline:none;line-height:1.5}.markdown-area{min-height:330px;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:.92rem}.short-area{min-height:86px}.report-area{min-height:260px}.text-area:focus,.select-input:focus{border-color:var(--link-color);box-shadow:0 0 0 3px #457b9d26}.form-row{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.compact-button{min-height:36px;padding:0 .75rem;flex:0 0 auto}.full-width{width:100%}.tool-button.subtle{color:var(--text-light)}.tool-button.danger{color:#b42318}.subject-panel{margin:0 0 1.25rem}.subject-select-inline{width:min(340px,100%)}.markdown-preview{color:var(--text-color);line-height:1.65}.markdown-preview h1,.markdown-preview h2,.markdown-preview h3{margin:.6rem 0 .4rem}.markdown-preview h1{font-size:1.45rem}.markdown-preview h2{font-size:1.25rem}.markdown-preview p,.markdown-preview ul{margin:.7rem 0}.markdown-preview pre{overflow:auto;margin:.9rem 0;padding:.9rem;border-radius:6px;background:#111827;color:#e5edf8}.markdown-preview code{font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:.92em}.markdown-preview p code,.markdown-preview li code{padding:.1rem .25rem;border-radius:4px;background:#eef2f7;color:var(--primary-color)}.session-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:1.25rem;align-items:start}.session-layout.with-review{grid-template-columns:minmax(0,1fr) minmax(320px,420px)}.review-panel{position:sticky;top:86px}.student-pill{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;min-height:34px;padding:0 .7rem;border:1px solid var(--border-color);border-radius:999px;color:var(--primary-color);background:#f8fafc;font-weight:700;font-size:.88rem}.student-pill svg{width:18px;height:18px}.create-band{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,360px);gap:2rem;align-items:end;margin:1rem 0 2rem;padding:2rem;background:#fff;border:1px solid var(--border-color);border-radius:8px;box-shadow:0 4px 20px #0000000d}.create-copy{min-width:0}.profile-gradient-line{overflow:visible;filter:drop-shadow(0 0 6px rgba(180,0,255,.35));width:200px;height:12px;display:block}.session-form{display:grid;gap:.75rem;align-content:end}.field-label{color:var(--text-light);font-size:.82rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.text-input{width:100%;height:44px;color:var(--text-color);background:#fff;border:1px solid var(--border-color);border-radius:6px;padding:0 .9rem;outline:none;transition:border-color .2s ease,box-shadow .2s ease}.text-input:focus{border-color:var(--link-color);box-shadow:0 0 0 3px #457b9d26}.segmented-control{display:inline-grid;grid-template-columns:repeat(2,minmax(90px,1fr));gap:2px;padding:3px;background:#eef2f7;border:1px solid var(--border-color);border-radius:6px}.segmented-control.compact{grid-template-columns:repeat(2,86px)}.segment{min-height:36px;border:0;border-radius:4px;background:transparent;color:var(--text-light);font-weight:700;transition:background .2s ease,color .2s ease,box-shadow .2s ease}.segment.is-active{background:#fff;color:var(--primary-color);box-shadow:0 1px 3px #0f172a1f}.primary-button,.tool-button,.icon-link{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:42px;border-radius:6px;text-decoration:none;transition:transform .2s ease,border-color .2s ease,background .2s ease,color .2s ease}.primary-button svg,.tool-button svg,.icon-link svg,.connection-pill svg,.users-pill svg{width:18px;height:18px;stroke-width:2}.primary-button{border:1px solid var(--primary-color);background:var(--primary-color);color:#fff;font-weight:700;padding:0 1rem}.primary-button:hover{background:var(--secondary-color);color:#fff;text-decoration:none;transform:translateY(-1px)}.primary-button.inline{width:fit-content;margin-top:1rem}.tool-button,.icon-link{border:1px solid var(--border-color);background:#fff;color:var(--primary-color);font-weight:700;padding:0 .9rem}.tool-button:hover,.icon-link:hover{border-color:var(--primary-color);color:var(--primary-color);text-decoration:none;transform:translateY(-1px)}.icon-link{width:42px;padding:0}.form-status{min-height:1.2rem;margin:0;color:var(--accent-color);font-size:.92rem}.preview-editor,.editor-panel{background:#111827;border:1px solid #1f2937;border-radius:8px;overflow:hidden;box-shadow:0 16px 40px #0f172a24}.preview-editor{min-height:320px}.preview-topline,.editor-topbar{min-height:54px;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 1rem;background:#f8fafc;border-bottom:1px solid var(--border-color)}.preview-topline span{color:var(--text-light);font-weight:700;font-size:.9rem}.preview-editor pre{margin:0;padding:1.25rem;color:#e5edf8;overflow:auto;font-size:.95rem;line-height:1.7}.preview-editor code{font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace}.workspace-toolbar{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;margin:1rem 0 1.25rem}.workspace-title{display:flex;align-items:center;gap:1rem;min-width:0}.workspace-title h1{margin:0;max-width:58vw;overflow-wrap:anywhere}.workspace-title .profile-gradient-line{margin-top:.25rem}.toolbar-actions{display:flex;align-items:center;gap:.75rem}.editor-topbar{background:#fff}.session-state{display:flex;align-items:center;justify-content:flex-end;gap:.75rem;min-width:0}.connection-pill,.users-pill{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;min-height:34px;padding:0 .7rem;border:1px solid var(--border-color);border-radius:999px;color:var(--text-light);font-weight:700;font-size:.88rem}.connection-pill.is-connected{color:#1f7a4d;border-color:#1f7a4d40;background:#2a9d8f14}.avatar-row{display:flex;align-items:center;min-width:0}.avatar{width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;margin-left:-6px;border:2px solid white;border-radius:50%;background:var(--avatar-color);color:#fff;font-size:.72rem;font-weight:800}.avatar:first-child{margin-left:0}.message-band{margin:1rem auto 0;padding:2rem;max-width:720px;background:#fff;border:1px solid var(--border-color);border-radius:8px;box-shadow:0 4px 20px #0000000d}footer{text-align:center;padding:2rem 0;color:var(--text-light);font-size:.9rem;border-top:1px solid var(--border-color);margin-top:4rem}@media(max-width:860px){.admin-grid,.subject-bank-layout,.session-layout.with-review{grid-template-columns:1fr}.create-band{grid-template-columns:1fr;align-items:start}.workspace-toolbar,.editor-topbar{align-items:stretch;flex-direction:column}.workspace-title h1{max-width:100%}.toolbar-actions,.session-state{justify-content:flex-start;flex-wrap:wrap}.review-panel{position:static}}@media(max-width:640px){header{flex-direction:column;padding:1rem;gap:1rem}.app-main,.workspace-main{width:min(100% - 1.5rem,1120px);padding-top:1.25rem}.create-band,.message-band,.app-title-band,.lock-panel,.panel,.subject-panel,.review-panel{padding:1.25rem}.app-title-band{align-items:flex-start;flex-direction:column}.segmented-control,.segmented-control.compact{width:100%;grid-template-columns:repeat(2,minmax(0,1fr))}.toolbar-actions,.tool-button{width:100%}.session-row,.form-row{align-items:stretch;flex-direction:column}h1{font-size:1.8rem}.app-title-copy h1{font-size:2rem}}