*,:before,:after{box-sizing:border-box}*{margin:0;padding:0}html,body,#root{min-height:100%}html{-webkit-text-size-adjust:100%}body{min-height:100vh;line-height:1.5}img,picture,video,canvas,svg{max-width:100%;display:block}input,button,textarea,select{font:inherit}button{cursor:pointer}ul,ol{list-style:none}a{color:inherit;text-decoration:none}:root{--color-white:#fff;--color-white-soft:#fafbfc;--color-white-muted:#f5f7f9;--color-white-deep:#eef1f5;--color-black:#000;--color-gray-light:#d1d5db;--color-gray:#9ca3af;--color-gray-dark:#6b7280;--color-gray-deep:#4b5563;--color-blue-soft:#eef4ff;--color-blue-soft-border:#cbd8ee;--color-blue-light:#263866;--color-blue:#1f2d56;--color-blue-dark:#182342;--color-green-light:#3fa46b;--color-green:#2e8b57;--color-green-dark:#246b44;--color-orange-light:#f7a56d;--color-orange:#f48a47;--color-orange-dark:#d96f2d;--color-pink-light:#f9bfd5;--color-pink:#f6a7c6;--color-pink-dark:#d978a1;--color-yellow-light:#f6d97b;--color-yellow:#f2c95b;--color-yellow-dark:#c99d2c;--color-red-light:#ef4444;--color-red:#dc2626;--color-red-dark:#991b1b;--color-bg:var(--color-white-deep);--color-success:var(--color-green);--color-warning:var(--color-yellow);--color-neutral:var(--color-gray);--color-error:var(--color-red);--color-link:var(--color-blue);--color-text:var(--color-black);--color-text-muted:var(--color-gray-deep);--color-text-subtle:var(--color-gray-dark);--color-chat-tutor-background:var(--color-white);--color-chat-tutor-border:var(--color-gray-light);--color-chat-student-background:var(--color-blue-soft);--color-chat-student-border:var(--color-blue-soft-border);--color-chat-message-text:var(--color-black);--color-chat-sender-text:var(--color-gray-dark);--color-surface:var(--color-white-muted);--color-surface-bright:var(--color-white);--color-border:var(--color-gray-light);--color-border-strong:var(--color-gray);--color-blue-hover:var(--color-blue-light);--color-blue-active:var(--color-blue-dark);--color-surface-hover:var(--color-white-soft);--color-surface-active:var(--color-white-deep);--color-error-hover:var(--color-red-light);--color-error-active:var(--color-red-dark);--shadow-button-hover:0 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50%/100% 100% no-repeat}.navbar{z-index:100;border-bottom:1px solid var(--color-border);background:var(--color-surface);min-height:6rem;position:relative;overflow:visible}.navbar-container{width:100%;min-height:6rem;padding:0 var(--space-6);align-items:center;display:flex;position:relative}.navbar-brand{color:var(--color-blue);transition:color var(--transition-fast), box-shadow var(--transition-fast);font-size:1.75rem;font-weight:700;text-decoration:none}.navbar-actions{right:var(--space-6);bottom:var(--space-2);align-items:center;display:flex;position:absolute}.navbar-ribbon{align-items:stretch;gap:var(--space-2);min-height:2.75rem;display:inline-flex}.navbar-home{justify-content:center;align-items:center;gap:var(--space-2);min-height:2.75rem;padding:0 var(--space-4);border:var(--border-width-thin) solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-white-soft);box-shadow:var(--shadow-button-resting);color:var(--color-blue-dark);transition:background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);text-decoration:none;display:inline-flex}.navbar-home:hover{border-color:var(--color-border-strong);background:var(--color-surface-hover);color:var(--color-blue);box-shadow:var(--shadow-button-hover)}.navbar-home:focus-visible{z-index:1;box-shadow:var(--focus-ring);outline:none;position:relative}.navbar-home__label{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);white-space:nowrap}.navbar-ribbon__icon{flex:none;width:1.15rem;height:1.15rem}.page-block{width:100%}.page-block--centered{flex-direction:column;flex:1;justify-content:center;display:flex}.page-block--content-centered{flex-direction:column;flex:1;justify-content:center;display:flex;transform:translateY(-2.5rem)}.page-block--workspace{flex-direction:column;flex:1;display:flex}.page-block--workspace>.content-box{flex:1}.page-header{margin-bottom:var(--space-10)}.page-header-title{color:var(--color-blue);font-size:2rem}.content-box{width:100%;min-height:60vh;padding:var(--space-6);border:var(--border-width-thin) solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);box-shadow:var(--shadow-surface)}.content-box--compact{min-height:auto}.content-box--medium{min-height:18rem}.content-box--large{--content-box-large-height:clamp(42rem, calc(100vh - 12rem), 58rem);min-height:var(--content-box-large-height)}.page-block--workspace>.content-box--large.content-box--height-bounded{flex:0 0 var(--content-box-large-height);height:var(--content-box-large-height);min-height:var(--content-box-large-height);max-height:var(--content-box-large-height);overflow:hidden}.content-box--centered{justify-content:center;align-items:center;display:flex}.content-box--stretch{width:100%}.content-box--layout-fill{flex-direction:column;min-height:0;display:flex}.content-box--layout-stack{flex-direction:column;display:flex}.content-box--layout-stack-center{flex-direction:column;justify-content:center;align-items:center;display:flex}.content-box--layout-center{justify-content:center;align-items:center;display:flex}.footer{border-top:1px solid var(--color-border);background:var(--color-blue);color:var(--color-white);margin-top:auto}.footer-container{width:100%;min-height:6rem;padding:var(--space-4) var(--space-6);justify-content:flex-end;align-items:flex-end;margin:0;display:flex}.footer-text{font-size:.875rem}.page-shell__alert{width:100%;padding:var(--space-3) var(--space-6)}.form{gap:var(--space-4);flex-direction:column;width:100%;display:flex}.form--compact{gap:var(--space-3)}.form--comfortable{gap:var(--space-6)}.form-field{gap:var(--space-2);flex-direction:column;display:flex}.form-field--inline{flex-direction:row;align-items:center}.form-label{color:var(--color-text);font-size:1.2rem;font-weight:600}.form-control{width:100%;padding:var(--space-3) var(--space-4);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);color:var(--color-text)}input.form-control--compact{height:2rem;padding:0 var(--space-3);font-size:var(--font-size-sm);line-height:normal}.form-control:focus{outline:2px solid var(--color-blue);outline-offset:2px;border-color:var(--color-blue)}.form-control:disabled{cursor:not-allowed;opacity:.65}.form-field__meta{justify-content:space-between;align-items:baseline;gap:var(--space-3);display:flex}.form-character-count{color:var(--color-black);font-size:var(--font-size-xs);font-weight:var(--font-weight-regular);line-height:var(--line-height-normal);white-space:nowrap;flex:none;margin:0}.form-character-count--error{color:var(--color-error)}input.form-control[readonly],textarea.form-control[readonly]{cursor:not-allowed;background:var(--color-surface-active)}textarea.form-control{resize:vertical;min-height:8rem}textarea.form-control--compact{min-height:5rem}select.form-control{cursor:pointer}.form-help{font-size:var(--font-size-sm);color:var(--color-text-muted);margin:0}.form-message--center{text-align:center}.form-message--right{text-align:right}.form-error{font-size:var(--font-size-xs);color:var(--color-error)}.form-actions{align-items:center;gap:var(--space-3);margin-top:var(--space-2);display:flex}.form-actions--right{justify-content:flex-end}.form-actions--between{justify-content:space-between}.password-control{width:100%;position:relative}.password-control-input{padding-right:3.5rem}.password-toggle{top:50%;right:var(--space-3);border-radius:var(--radius-sm);width:2rem;height:2rem;color:var(--color-blue);background:0 0;border:0;justify-content:center;align-items:center;padding:0;display:inline-flex;position:absolute;transform:translateY(-50%)}.password-toggle-icon{width:1.15rem;height:1.15rem}.password-toggle:hover{background:var(--color-surface-active)}.password-toggle:focus-visible{outline:2px solid var(--color-blue);outline-offset:2px}.password-toggle:disabled{cursor:not-allowed;opacity:.65}.form-control::placeholder{color:var(--color-text-subtle);opacity:1}.button{min-height:2.75rem;padding:0 var(--space-5);border:var(--border-width-thin) solid transparent;border-radius:var(--radius-lg);box-shadow:var(--shadow-button-resting);font-weight:var(--font-weight-semibold);text-align:center;transition:background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast), transform var(--transition-fast);justify-content:center;align-items:center;display:inline-flex}.button:not(:disabled){cursor:pointer}.button:not(:disabled):active{box-shadow:var(--shadow-button-active);transform:translateY(1px)}.button--primary{border-color:var(--color-blue-dark);background:var(--color-blue);color:var(--color-white)}.button--primary:not(:disabled):hover{background:var(--color-blue-hover);box-shadow:var(--shadow-button-hover)}.button--primary:not(:disabled):active{background:var(--color-blue-active)}.button--secondary{border-color:var(--color-border-strong);background:var(--color-surface);color:var(--color-text)}.button--secondary:not(:disabled):hover{border-color:var(--color-border-strong);background:var(--color-surface-hover);color:var(--color-blue);box-shadow:var(--shadow-button-hover)}.button--secondary:not(:disabled):active{background:var(--color-surface-active)}.button--danger{border-color:var(--color-red-dark);background:var(--color-error);color:var(--color-white)}.button--danger:not(:disabled):hover{background:var(--color-error-hover);box-shadow:var(--shadow-button-hover)}.button--danger:not(:disabled):active{background:var(--color-error-active)}.button:focus-visible{box-shadow:var(--focus-ring);outline:none}.button--full{width:100%}.button:disabled{cursor:not-allowed;box-shadow:none;opacity:.5}.tri-signal-dot{vertical-align:middle;border-radius:999px;width:.75rem;height:.75rem;display:inline-block}.tri-signal-dot--green{background-color:var(--color-success)}.tri-signal-dot--yellow{background-color:var(--color-warning)}.tri-signal-dot--red{background-color:var(--color-error)}.tri-signal-dot--gray{background-color:var(--color-neutral)}.list-table{width:100%}.list-table__viewport{border:var(--border-width-thin) solid var(--color-border-strong);border-radius:var(--radius-md);background-color:var(--color-surface);width:100%;overflow-x:auto;box-shadow:0 0 0 1px #cbd5e138,0 .125rem .4rem #1f2d560d}.list-table__table{border-collapse:collapse;width:100%;font-size:.95rem}.list-table__head{background-color:var(--color-surface-active)}.list-table__header-cell{padding:var(--space-3) var(--space-4);text-align:left;font-weight:var(--font-weight-bold);color:var(--color-text);border-bottom:var(--border-width-thin) solid var(--color-border-strong);white-space:nowrap}.list-table__body td{padding:var(--space-3) var(--space-4);border-bottom:var(--border-width-thin) solid var(--color-border);vertical-align:middle}.list-table__body tr:last-child td{border-bottom:none}.list-table__row{cursor:pointer}.list-table__row>td{transition:background-color var(--transition-fast), box-shadow var(--transition-fast);background-color:#0000}.list-table__row:not(.list-table__row--selected):hover>td{background-color:var(--color-surface-hover)}.list-table__row--selected>td{background-color:var(--color-blue-soft)}.list-table__row--selected>td:first-child{box-shadow:inset .25rem 0 0 var(--color-blue)}.list-table__row--selected:hover>td{background-color:var(--color-blue-soft)}.list-table__row:focus-visible{outline:2px solid var(--color-blue);outline-offset:-2px}.list-table__empty-cell{padding:var(--space-6) var(--space-4);text-align:center;color:var(--color-black);font-weight:var(--font-weight-semibold)}.icon-button{border-radius:var(--radius-md);width:2.25rem;height:2.25rem;color:var(--color-text);background:0 0;border:1px solid #0000;justify-content:center;align-items:center;padding:0;display:inline-flex}.icon-button:not(:disabled){cursor:pointer}.icon-button:not(:disabled):hover{background:var(--color-surface-hover);border-color:var(--color-border)}.icon-button:focus-visible{box-shadow:var(--focus-ring);outline:none}.icon-button:disabled{cursor:not-allowed;opacity:.5}.icon-button__icon{width:1.25rem;height:1.25rem}.chat-message-bubble{gap:var(--space-1);flex-direction:column;width:100%;display:flex}.chat-message-bubble--tutor{align-items:flex-start}.chat-message-bubble--student{align-items:flex-end}.chat-message-bubble__sender{padding:0 var(--space-2);color:var(--color-chat-sender-text);font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);line-height:var(--line-height-normal)}.chat-message-bubble__surface{width:fit-content;max-width:min(78%,46rem);padding:var(--space-3) var(--space-4);border-width:var(--border-width-thin);border-radius:var(--radius-lg);color:var(--color-chat-message-text);border-style:solid;border-color:#0000}.chat-message-bubble--tutor .chat-message-bubble__surface{border-color:var(--color-chat-tutor-border);border-bottom-left-radius:var(--radius-sm);background-color:var(--color-chat-tutor-background)}.chat-message-bubble--student .chat-message-bubble__surface{border-color:var(--color-chat-student-border);border-bottom-right-radius:var(--radius-sm);background-color:var(--color-chat-student-background)}.chat-message-bubble__content{color:inherit;font-size:var(--font-size-base);font-weight:var(--font-weight-regular);line-height:var(--line-height-relaxed);white-space:pre-wrap;overflow-wrap:anywhere}@media (width<=48rem){.chat-message-bubble__surface{max-width:90%}}.modal{z-index:1000;padding:var(--space-5);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background-color:#1823426b;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal__dialog{width:min(100%,34rem);max-height:calc(100vh - (var(--space-5) * 2));border:var(--border-width-thin) solid var(--color-border-strong);border-radius:var(--radius-lg);background-color:var(--color-surface-bright);box-shadow:var(--shadow-surface);overflow-y:auto}.modal__header{justify-content:space-between;align-items:flex-start;gap:var(--space-4);padding:var(--space-4) var(--space-4) var(--space-4) var(--space-5);border-bottom:var(--border-width-thin) solid 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input{width:1rem;height:1rem;accent-color:var(--color-blue);cursor:pointer;flex:none;margin:0}.modal__actions{justify-content:flex-end;align-items:center;gap:var(--space-3);margin-top:var(--space-6);display:flex}@media (width<=36rem){.modal{padding:var(--space-4) var(--space-3);align-items:flex-start;overflow-y:auto}.modal__dialog{width:100%;max-height:none}.modal__actions{flex-direction:column-reverse;align-items:stretch}.modal__actions .button{width:100%}}.modal__close:not(:disabled):hover{color:var(--color-white);background-color:#ffffff1f;border-color:#ffffff59}.page-alert{justify-content:space-between;align-items:flex-start;gap:var(--space-4);width:100%;padding:var(--space-4);border:var(--border-width-thin) solid 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.wizard-step-number{background:var(--color-green);color:var(--color-white)}.tutor-library-table__row{cursor:pointer;transition:background-color var(--transition-fast)}.tutor-library-table__row:hover{background-color:var(--color-surface-hover)}.tutor-library-table__row--selected{background-color:var(--color-surface-active)}.tutor-library-table__cell{max-width:18rem}.tutor-library-table__text{text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.tutor-library-table__created-cell{white-space:nowrap}.tutor-library-table__availability-cell{text-align:center;width:7rem}.teacher-dashboard-main-content{flex-direction:column;width:100%;display:flex}.teacher-dashboard-main-content__nav{padding-left:var(--space-4);margin-bottom:var(--space-1);align-items:center;display:flex}.teacher-dashboard-main-content__section-label{padding:var(--space-2) var(--space-4);border:var(--border-width-thin) solid 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(width<=500px){.chatroom-form__detail-row{gap:var(--space-1);grid-template-columns:1fr}}.chatroom-message-library{gap:var(--space-5);flex-direction:column;width:100%;display:flex}.chatroom-message-library__item{width:100%}.chatroom-message-composer{align-items:flex-end;gap:var(--space-2);width:100%;padding:var(--space-2);border-width:var(--border-width-thin);border-style:solid;border-color:var(--color-border);border-radius:var(--radius-lg);background-color:var(--color-surface);transition:border-color var(--transition-fast), box-shadow var(--transition-fast);display:flex}.chatroom-message-composer:focus-within{border-color:var(--color-blue);box-shadow:var(--focus-ring)}.chatroom-message-composer__field{flex:1;min-width:0;display:flex;position:relative}.chatroom-message-composer__input{min-width:0;min-height:var(--control-height-md);max-height:10rem;padding:var(--space-2) 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var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);box-shadow:var(--shadow-button-hover);flex-direction:column;display:flex;position:absolute;right:0}.teacher-menu__item{text-align:center;justify-content:center;width:100%}.teacher-menu__divider{width:100%;height:1px;margin:var(--space-1) 0;background:var(--color-border)}.teacher-menu__error{color:var(--color-danger);font-size:var(--font-size-sm);text-align:center;margin:0}.teacher-students-table{flex-direction:column;width:100%;height:100%;min-height:0;display:flex}.teacher-students-table .list-table__viewport{flex:1 1 0;min-height:0;overflow:auto}.teacher-students-table 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