:root{--bg:#f6f7f4;--surface:#fff;--surface-muted:#eef3ee;--text:#17201c;--muted:#65716a;--line:#dce3dd;--primary:#1f7a5c;--primary-strong:#13523f;--accent:#c15b36;--warning:#b7791f;--danger:#b42318;--shadow:0 18px 48px #19261f1a;--radius:8px;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer;border:0;border-radius:7px;justify-content:center;align-items:center;gap:8px;min-height:40px;padding:9px 12px;transition:background .16s,color .16s,transform .16s;display:inline-flex}button:hover{transform:translateY(-1px)}button:disabled{cursor:not-allowed;opacity:.55}button:disabled:hover{transform:none}button:focus-visible,input:focus-visible,select:focus-visible{outline-offset:2px;outline:3px solid #1f7a5c38}input,select{border:1px solid var(--line);color:var(--text);background:#fff;border-radius:7px;width:100%;min-height:42px;padding:10px 11px}h1,h2,p{margin:0}#app{min-height:100vh}.app-shell{grid-template-columns:300px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{color:#f6fbf7;background:#17201c;flex-direction:column;gap:22px;padding:22px;display:flex}.brand{align-items:center;gap:12px;display:flex}.brand strong,.brand span{display:block}.brand span{color:#b6c4bb;margin-top:2px;font-size:.85rem}.brand-mark{background:var(--primary);border-radius:var(--radius);place-items:center;width:42px;height:42px;display:grid}.workspace-switch{border-radius:var(--radius);background:#ffffff14;border:1px solid #ffffff1a;grid-template-columns:1fr;gap:4px;padding:4px;display:grid}.workspace-switch button,.nav-list button{color:#dce7df;background:0 0}.workspace-switch button.active,.nav-list button.active{color:#17201c;background:#fff}.language-switch{width:100%;position:relative}.language-trigger,.language-option{color:#17201c;background:#fffffff0;border:1px solid #ffffff24;justify-content:flex-start;gap:8px;width:100%;min-height:38px;padding:6px 30px 6px 10px}.language-trigger{position:relative}.language-trigger:after{content:"";border-top:5px solid #17201c;border-left:4px solid #0000;border-right:4px solid #0000;position:absolute;top:50%;right:10px;transform:translateY(-50%)}.language-menu{border-radius:var(--radius);z-index:20;background:#fff;border:1px solid #17201c24;gap:2px;width:100%;padding:4px;display:grid;position:absolute;top:calc(100% + 6px);left:0;box-shadow:0 12px 30px #0003}.language-option{border-color:#0000;border-radius:6px;padding-right:10px}.language-option.active,.language-option:hover{background:#fff;border-color:#1f7a5c59}.flag{border:1px solid #17201c40;border-radius:3px;width:28px;height:18px;display:block;position:relative;overflow:hidden;box-shadow:0 1px 2px #00000029}.flag-uk{background:linear-gradient(27deg,#0000 45%,#fff 45% 55%,#0000 55%),linear-gradient(-27deg,#0000 45%,#fff 45% 55%,#0000 55%),linear-gradient(27deg,#0000 48%,#c8102e 48% 52%,#0000 52%),linear-gradient(-27deg,#0000 48%,#c8102e 48% 52%,#0000 52%),linear-gradient(90deg,#0000 42%,#fff 42% 58%,#0000 58%),linear-gradient(#0000 36%,#fff 36% 64%,#0000 64%),linear-gradient(90deg,#0000 46%,#c8102e 46% 54%,#0000 54%),linear-gradient(#0000 42%,#c8102e 42% 58%,#0000 58%),#012169}.flag-serbia{background:linear-gradient(#c6363c 0 33.33%,#0c4076 33.33% 66.66%,#fff 66.66% 100%)}.flag-serbia:after{content:"";background:#f5d34f;border:1px solid #17201c47;border-radius:50%;width:6px;height:6px;position:absolute;top:6px;left:7px}.flag-germany{background:linear-gradient(#000 0 33.33%,#d00 33.33% 66.66%,#ffce00 66.66% 100%)}.nav-list{gap:7px;display:grid}.nav-list button{justify-content:flex-start}.logout-button{background:var(--text);color:#f6fbf7;white-space:nowrap}.auth-panel{border-radius:var(--radius);background:#ffffff14;border:1px solid #ffffff1a;gap:12px;margin-top:auto;padding:14px;display:grid}.auth-panel label,.stack-form{gap:8px;display:grid}.auth-panel span{color:#c9d7cf;font-size:.8rem}.auth-panel input{background:#fffffff0}.auth-tabs{border-radius:var(--radius);background:#ffffff14;border:1px solid #ffffff1a;grid-template-columns:repeat(2,1fr);gap:4px;padding:4px;display:grid}.auth-tabs button{color:#dce7df;background:0 0;min-height:36px}.auth-tabs button.active{color:#17201c;background:#fff}.password-field{position:relative}.password-field input{padding-right:44px}.password-field button{color:var(--muted);background:0 0;min-height:34px;padding:7px;position:absolute;top:4px;right:4px}.auth-actions{gap:8px;display:grid}.auth-actions button,.stack-form button{background:var(--primary);color:#fff}.auth-actions button:first-child{color:#17201c;background:#f0f5f1}.auth-message{border-radius:var(--radius);color:#dce7df;overflow-wrap:anywhere;background:#ffffff14;border:1px solid #ffffff1a;align-items:flex-start;gap:8px;padding:12px;font-size:.86rem;line-height:1.4;display:flex}.auth-message.signed-in{color:#eaf6ef;background:#eaf6ef24}.auth-message svg{flex:none;margin-top:2px}.developer-credit{color:#13523f;font-weight:700;text-decoration:none}.developer-credit:hover{color:#0f3f31;text-decoration:underline}.app-footer{border-radius:var(--radius);color:#4c5c53;text-align:center;background:linear-gradient(#edf6f0 0%,#e2eee6 100%);border:1px solid #c6dbcf;flex-wrap:wrap;justify-content:center;align-items:center;gap:8px 12px;padding:13px 18px;font-size:.84rem;line-height:1.4;display:flex;box-shadow:0 8px 24px #19261f0f}.app-footer span,.developer-credit{overflow-wrap:anywhere}.footer-divider{background:#aac5b4;border-radius:999px;width:4px;height:4px}.footer-version{color:#5b6a61;background:#ffffffa6;border:1px solid #1f7a5c2e;border-radius:999px;padding:3px 8px;font-size:.78rem}.workspace{grid-template-rows:auto 1fr auto;gap:22px;padding:28px;display:grid}.topbar{justify-content:space-between;align-items:start;gap:18px;display:flex}.topbar-actions{justify-content:flex-end;align-items:flex-start;gap:10px;display:flex}.eyebrow{color:var(--primary);letter-spacing:0;text-transform:uppercase;font-size:.82rem;font-weight:700}.topbar h1{letter-spacing:0;margin-top:4px;font-size:clamp(1.8rem,3vw,2.7rem);line-height:1.05}.api-pill{background:var(--surface);border:1px solid var(--line);color:var(--muted);overflow-wrap:anywhere;border-radius:999px;flex:0 520px;justify-content:flex-start;align-items:center;gap:8px;min-height:38px;padding:8px 12px;font-size:.86rem;display:inline-flex}.api-pill.signed-in{color:var(--primary-strong);background:#eaf6ef}.topbar-actions .api-pill{flex-basis:auto}.grid{gap:18px;display:grid}.two-columns{grid-template-columns:repeat(2,minmax(0,1fr))}.calendar-layout{grid-template-columns:minmax(260px,360px) minmax(0,1fr)}.wide{grid-column:1/-1}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);min-width:0;padding:18px}.panel-header{align-items:center;gap:9px;margin-bottom:16px;display:flex}.panel-header h2{letter-spacing:0;font-size:1rem}.welcome-panel{align-content:start;gap:12px;display:grid}.welcome-copy{gap:8px;display:grid}.welcome-copy strong{font-size:1.3rem;line-height:1.25}.welcome-copy span{color:var(--muted);line-height:1.5}.metrics{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.overview-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.metric{background:var(--surface-muted);border-radius:7px;gap:8px;min-height:130px;padding:14px;display:grid}.metric svg{color:var(--primary)}.metric span,.lesson-main span,.lesson-main small,.person-card span,.material-card span{color:var(--muted);font-size:.9rem}.metric strong{align-self:end;font-size:1.75rem}.empty-state{color:var(--muted);line-height:1.45}.lesson-list,.people-list,.material-list,.table,.task-list{gap:10px;display:grid}.lesson-card{border:1px solid var(--line);border-radius:var(--radius);background:#fbfcfb;grid-template-columns:54px minmax(0,1fr) auto auto;align-items:center;gap:12px;padding:12px;display:grid}.compact .lesson-card{grid-template-columns:54px minmax(0,1fr) auto}.date-tile{background:#e8f3ed;border-radius:7px;place-items:center;width:54px;height:54px;line-height:1;display:grid}.date-tile strong{font-size:1.2rem}.date-tile span{color:var(--primary-strong);font-size:.8rem}.lesson-main{gap:3px;min-width:0;display:grid}.lesson-actions{gap:6px;display:flex}.lesson-actions button,.material-card button{color:var(--text);background:#edf2ee;min-height:36px;padding:8px 10px}.secondary-button{color:var(--text);background:#edf2ee}.lesson-filter{flex-wrap:wrap;gap:8px;margin:18px 0 14px;display:flex}.secondary-button.active{background:var(--primary);color:#fff}.lesson-section-title{letter-spacing:0;margin:0 0 10px;font-size:.9rem}.upcoming-toggle{justify-self:start;margin-top:12px}.status{text-transform:capitalize;border-radius:999px;justify-content:center;min-width:86px;padding:5px 9px;font-size:.78rem;font-weight:700;display:inline-flex}.status.scheduled,.status.unpaid{color:var(--warning);background:#fff4de}.status.completed,.status.paid{color:var(--primary-strong);background:#e7f6ec}.status.canceled{color:var(--danger);background:#fdecea}.split-inputs{grid-template-columns:1fr 1fr;gap:8px;display:grid}.row{border:1px solid var(--line);border-radius:var(--radius);background:#fbfcfb;grid-template-columns:130px minmax(0,1fr) 110px auto;align-items:center;gap:10px;padding:12px;display:grid}.row span{color:var(--muted)}.invoice-row{grid-template-columns:minmax(0,1fr) auto auto}.report-row{grid-template-columns:130px minmax(0,1fr) minmax(110px,.7fr) auto auto}.invoice-main{gap:3px;min-width:0;display:grid}.invoice-main span,.invoice-main small{color:var(--muted)}.invoice-main strong,.invoice-main small{overflow-wrap:anywhere}.invoice-amount{white-space:nowrap}.invoice-actions{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:6px;display:flex}.invoice-toggle,.invoice-extra-list{margin-top:12px}.status-button{background:0 0;min-height:0;padding:0}.person-card,.material-card,.task-list span,.task-list button{border:1px solid var(--line);border-radius:var(--radius);background:#fbfcfb;padding:13px}.task-list button{color:var(--text);text-align:left;justify-content:flex-start;width:100%;min-height:0;line-height:1.35}.person-card{gap:5px;display:grid}.student-contact{gap:3px;display:grid}.student-contact span{overflow-wrap:anywhere}.person-actions{justify-content:flex-end;gap:6px;display:flex}.person-actions button{color:var(--text);background:#edf2ee;min-height:36px;padding:8px 10px}.inline-edit-form{gap:8px;display:grid}.material-edit-form{width:100%}.material-card{justify-content:space-between;align-items:center;gap:12px;display:flex}.material-card div{gap:4px;min-width:0;display:grid}.material-actions{flex:none;align-items:center;gap:6px;display:flex}@media (width<=1040px){.app-shell,.two-columns,.calendar-layout{grid-template-columns:1fr}.sidebar{position:static}.nav-list{grid-template-columns:repeat(3,minmax(0,1fr))}.topbar{flex-direction:column}.topbar-actions{justify-content:flex-start;width:100%}.api-pill{width:100%}.invoice-row{grid-template-columns:minmax(0,1fr) auto}.invoice-actions{grid-column:1/-1;justify-content:flex-start}}@media (width<=680px){.workspace,.sidebar{padding:16px}.nav-list,.metrics,.split-inputs{grid-template-columns:1fr}.lesson-card,.compact .lesson-card,.row,.invoice-row{grid-template-columns:1fr;align-items:start}.date-tile{width:48px;height:48px}.lesson-actions,.material-actions,.material-card,.topbar-actions{flex-direction:column;align-items:stretch}}