:root{--mat-sys-background: #fff8f6;--mat-sys-error: #ba1a1a;--mat-sys-error-container: #ffdad6;--mat-sys-inverse-on-surface: #fbeeec;--mat-sys-inverse-primary: #ffb4a8;--mat-sys-inverse-surface: #362f2e;--mat-sys-on-background: #201a19;--mat-sys-on-error: #ffffff;--mat-sys-on-error-container: #93000a;--mat-sys-on-primary: #ffffff;--mat-sys-on-primary-container: #930100;--mat-sys-on-primary-fixed: #410000;--mat-sys-on-primary-fixed-variant: #930100;--mat-sys-on-secondary: #ffffff;--mat-sys-on-secondary-container: #5d3f3b;--mat-sys-on-secondary-fixed: #2c1512;--mat-sys-on-secondary-fixed-variant: #5d3f3b;--mat-sys-on-surface: #201a19;--mat-sys-on-surface-variant: #534341;--mat-sys-on-tertiary: #ffffff;--mat-sys-on-tertiary-container: #930100;--mat-sys-on-tertiary-fixed: #410000;--mat-sys-on-tertiary-fixed-variant: #930100;--mat-sys-outline: #857370;--mat-sys-outline-variant: #d8c2be;--mat-sys-primary: #c00100;--mat-sys-primary-container: #ffdad4;--mat-sys-primary-fixed: #ffdad4;--mat-sys-primary-fixed-dim: #ffb4a8;--mat-sys-scrim: #000000;--mat-sys-secondary: #775651;--mat-sys-secondary-container: #ffdad4;--mat-sys-secondary-fixed: #ffdad4;--mat-sys-secondary-fixed-dim: #e7bdb6;--mat-sys-shadow: #000000;--mat-sys-surface: #fff8f6;--mat-sys-surface-bright: #fff8f6;--mat-sys-surface-container: #f9ebe9;--mat-sys-surface-container-high: #f3e5e4;--mat-sys-surface-container-highest: #ede0dd;--mat-sys-surface-container-low: #fef1ef;--mat-sys-surface-container-lowest: #ffffff;--mat-sys-surface-dim: #e4d7d6;--mat-sys-surface-tint: #c00100;--mat-sys-surface-variant: #f5ddda;--mat-sys-tertiary: #c00100;--mat-sys-tertiary-container: #ffdad4;--mat-sys-tertiary-fixed: #ffdad4;--mat-sys-tertiary-fixed-dim: #ffb4a8;--mat-sys-neutral-variant20: #3b2d2b;--mat-sys-neutral10: #201a19;--mat-sys-level0: 0px 0px 0px 0px rgba(0, 0, 0, .2), 0px 0px 0px 0px rgba(0, 0, 0, .14), 0px 0px 0px 0px rgba(0, 0, 0, .12);--mat-sys-level1: 0px 2px 1px -1px rgba(0, 0, 0, .2), 0px 1px 1px 0px rgba(0, 0, 0, .14), 0px 1px 3px 0px rgba(0, 0, 0, .12);--mat-sys-level2: 0px 3px 3px -2px rgba(0, 0, 0, .2), 0px 3px 4px 0px rgba(0, 0, 0, .14), 0px 1px 8px 0px rgba(0, 0, 0, .12);--mat-sys-level3: 0px 3px 5px -1px rgba(0, 0, 0, .2), 0px 6px 10px 0px rgba(0, 0, 0, .14), 0px 1px 18px 0px rgba(0, 0, 0, .12);--mat-sys-level4: 0px 5px 5px -3px rgba(0, 0, 0, .2), 0px 8px 10px 1px rgba(0, 0, 0, .14), 0px 3px 14px 2px rgba(0, 0, 0, .12);--mat-sys-level5: 0px 7px 8px -4px rgba(0, 0, 0, .2), 0px 12px 17px 2px rgba(0, 0, 0, .14), 0px 5px 22px 4px rgba(0, 0, 0, .12);--mat-sys-body-large: 400 1rem / 1.5rem Roboto;--mat-sys-body-large-font: Roboto;--mat-sys-body-large-line-height: 1.5rem;--mat-sys-body-large-size: 1rem;--mat-sys-body-large-tracking: .031rem;--mat-sys-body-large-weight: 400;--mat-sys-body-medium: 400 .875rem / 1.25rem Roboto;--mat-sys-body-medium-font: Roboto;--mat-sys-body-medium-line-height: 1.25rem;--mat-sys-body-medium-size: .875rem;--mat-sys-body-medium-tracking: .016rem;--mat-sys-body-medium-weight: 400;--mat-sys-body-small: 400 .75rem / 1rem Roboto;--mat-sys-body-small-font: Roboto;--mat-sys-body-small-line-height: 1rem;--mat-sys-body-small-size: .75rem;--mat-sys-body-small-tracking: .025rem;--mat-sys-body-small-weight: 400;--mat-sys-display-large: 400 3.562rem / 4rem Roboto;--mat-sys-display-large-font: Roboto;--mat-sys-display-large-line-height: 4rem;--mat-sys-display-large-size: 3.562rem;--mat-sys-display-large-tracking: -.016rem;--mat-sys-display-large-weight: 400;--mat-sys-display-medium: 400 2.812rem / 3.25rem Roboto;--mat-sys-display-medium-font: Roboto;--mat-sys-display-medium-line-height: 3.25rem;--mat-sys-display-medium-size: 2.812rem;--mat-sys-display-medium-tracking: 0;--mat-sys-display-medium-weight: 400;--mat-sys-display-small: 400 2.25rem / 2.75rem Roboto;--mat-sys-display-small-font: Roboto;--mat-sys-display-small-line-height: 2.75rem;--mat-sys-display-small-size: 2.25rem;--mat-sys-display-small-tracking: 0;--mat-sys-display-small-weight: 400;--mat-sys-headline-large: 400 2rem / 2.5rem Roboto;--mat-sys-headline-large-font: Roboto;--mat-sys-headline-large-line-height: 2.5rem;--mat-sys-headline-large-size: 2rem;--mat-sys-headline-large-tracking: 0;--mat-sys-headline-large-weight: 400;--mat-sys-headline-medium: 400 1.75rem / 2.25rem Roboto;--mat-sys-headline-medium-font: Roboto;--mat-sys-headline-medium-line-height: 2.25rem;--mat-sys-headline-medium-size: 1.75rem;--mat-sys-headline-medium-tracking: 0;--mat-sys-headline-medium-weight: 400;--mat-sys-headline-small: 400 1.5rem / 2rem Roboto;--mat-sys-headline-small-font: Roboto;--mat-sys-headline-small-line-height: 2rem;--mat-sys-headline-small-size: 1.5rem;--mat-sys-headline-small-tracking: 0;--mat-sys-headline-small-weight: 400;--mat-sys-label-large: 500 .875rem / 1.25rem Roboto;--mat-sys-label-large-font: Roboto;--mat-sys-label-large-line-height: 1.25rem;--mat-sys-label-large-size: .875rem;--mat-sys-label-large-tracking: .006rem;--mat-sys-label-large-weight: 500;--mat-sys-label-large-weight-prominent: 700;--mat-sys-label-medium: 500 .75rem / 1rem Roboto;--mat-sys-label-medium-font: Roboto;--mat-sys-label-medium-line-height: 1rem;--mat-sys-label-medium-size: .75rem;--mat-sys-label-medium-tracking: .031rem;--mat-sys-label-medium-weight: 500;--mat-sys-label-medium-weight-prominent: 700;--mat-sys-label-small: 500 .688rem / 1rem Roboto;--mat-sys-label-small-font: Roboto;--mat-sys-label-small-line-height: 1rem;--mat-sys-label-small-size: .688rem;--mat-sys-label-small-tracking: .031rem;--mat-sys-label-small-weight: 500;--mat-sys-title-large: 400 1.375rem / 1.75rem Roboto;--mat-sys-title-large-font: Roboto;--mat-sys-title-large-line-height: 1.75rem;--mat-sys-title-large-size: 1.375rem;--mat-sys-title-large-tracking: 0;--mat-sys-title-large-weight: 400;--mat-sys-title-medium: 500 1rem / 1.5rem Roboto;--mat-sys-title-medium-font: Roboto;--mat-sys-title-medium-line-height: 1.5rem;--mat-sys-title-medium-size: 1rem;--mat-sys-title-medium-tracking: .009rem;--mat-sys-title-medium-weight: 500;--mat-sys-title-small: 500 .875rem / 1.25rem Roboto;--mat-sys-title-small-font: Roboto;--mat-sys-title-small-line-height: 1.25rem;--mat-sys-title-small-size: .875rem;--mat-sys-title-small-tracking: .006rem;--mat-sys-title-small-weight: 500;--mat-sys-corner-extra-large: 28px;--mat-sys-corner-extra-large-top: 28px 28px 0 0;--mat-sys-corner-extra-small: 4px;--mat-sys-corner-extra-small-top: 4px 4px 0 0;--mat-sys-corner-full: 9999px;--mat-sys-corner-large: 16px;--mat-sys-corner-large-end: 0 16px 16px 0;--mat-sys-corner-large-start: 16px 0 0 16px;--mat-sys-corner-large-top: 16px 16px 0 0;--mat-sys-corner-medium: 12px;--mat-sys-corner-none: 0;--mat-sys-corner-small: 8px;--mat-sys-dragged-state-layer-opacity: .16;--mat-sys-focus-state-layer-opacity: .12;--mat-sys-hover-state-layer-opacity: .08;--mat-sys-pressed-state-layer-opacity: .12}body{font-family:Roboto,sans-serif;margin:0;background-color:#faeaeb;position:relative}h1{color:var(--mat-sys-primary);font-size:1.75rem;font-weight:700;margin:0 0 8px}h2{font-size:1.1rem;font-weight:600;color:#000000bf;margin:0}button{color:var(--mat-sys-primary);border:black}.logo{margin:0 auto;width:250px}:root{--mat-sys-primary: #c62828;--mat-sys-on-primary: #ffffff;--mat-sys-primary-container: #ffcdd2;--mat-sys-on-primary-container: #b71c1c}.welcome-banner{display:flex;align-items:center;justify-content:space-between;gap:16px;background:#fff;border-radius:16px;border-left:5px solid var(--mat-sys-primary);padding:24px 32px;margin-bottom:28px;box-shadow:0 2px 12px #c6282814}.welcome-text{display:flex;flex-direction:column;gap:2px}.welcome-greeting{margin:0;font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:#00000073}.welcome-name{margin:0;font-size:1.9rem;font-weight:700;color:var(--mat-sys-primary);line-height:1.15}.new-lesson-cta{white-space:nowrap;padding:10px 20px!important;font-size:.9rem!important;font-weight:600!important;letter-spacing:.03em!important;border-radius:10px!important;box-shadow:0 3px 10px #c628284d!important}.new-lesson-cta .mdc-button__label{display:inline-flex;align-items:center;gap:6px}.section-header{display:flex;align-items:center;gap:12px;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--mat-sys-primary-container)}.lesson-list{display:flex;flex-direction:column;gap:12px;margin-top:4px}.lesson-card{border-left:4px solid var(--mat-sys-primary);transition:box-shadow .2s}.lesson-card:hover{box-shadow:0 4px 16px #0000001a,0 1px 4px #c6282814}.lesson-avatar{background-color:var(--mat-sys-primary-container);color:var(--mat-sys-primary);border-radius:50%;display:flex;align-items:center;justify-content:center;width:40px;height:40px}.lesson-description{color:#000000a6;font-size:.9rem;margin:0 0 4px}.no-lessons-msg{color:#00000073;font-style:italic;text-align:center;padding:40px 0}.lesson-meta{display:flex;gap:16px;margin-top:8px;flex-wrap:wrap}.lesson-meta-item{display:flex;align-items:center;gap:4px;color:#0000008c;font-size:.82rem;padding:3px 8px 3px 4px;border-radius:20px}.lesson-meta-item mat-icon{font-size:15px;width:15px;height:15px;color:var(--mat-sys-primary)}.delete-btn{margin-left:auto}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-avatar{width:40px;height:40px;border-radius:50%;flex-shrink:0;background:linear-gradient(90deg,#e8d5d5 25%,#f5e8e8,#e8d5d5 75%);background-size:200% 100%;animation:shimmer 1.5s infinite linear}.skeleton-line{border-radius:4px;background:linear-gradient(90deg,#e8d5d5 25%,#f5e8e8,#e8d5d5 75%);background-size:200% 100%;animation:shimmer 1.5s infinite linear}.skeleton-title{height:18px;width:55%}.skeleton-subtitle{height:13px;width:38%;margin-top:4px}.skeleton-body{height:13px;width:100%;margin-bottom:8px}.skeleton-body--short{width:65%}.skeleton-meta-chip{height:13px;width:110px}.new-lesson-page{max-width:600px;margin:0 auto}.lesson-form{display:flex;flex-direction:column;gap:16px;margin-top:20px}.form-card{background:#fff;border-radius:12px;padding:20px 24px 16px;box-shadow:0 1px 4px #0000000f,0 2px 10px #0000000a;display:flex;flex-direction:column}.form-card mat-form-field{width:100%}.form-section-header{display:flex;align-items:center;gap:10px;margin-bottom:16px}.step-badge{width:26px;height:26px;border-radius:50%;background:var(--mat-sys-primary);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}.form-section-title{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:#00000080}.loading-row{display:flex;align-items:center;gap:12px;color:#0000008a;font-size:14px;padding:8px 0}.slots-hint{color:#00000073;font-size:14px;font-style:italic;margin:4px 0 0}.slot-grid{display:flex;flex-wrap:wrap;gap:8px}.slot-btn{display:inline-flex;align-items:center;gap:5px;padding:7px 14px;border:1.5px solid rgba(0,0,0,.2);border-radius:24px;background:transparent;cursor:pointer;font-family:Roboto,sans-serif;font-size:13px;font-weight:500;transition:background .15s,color .15s,border-color .15s,box-shadow .15s}.slot-btn:not(:disabled):hover{border-color:var(--mat-sys-primary);background:#fff0f0;box-shadow:0 2px 6px #c628281f}.slot-btn.slot-btn--selected{background:var(--mat-sys-primary);color:var(--mat-sys-on-primary);border-color:var(--mat-sys-primary);box-shadow:0 2px 8px #c628284d}.slot-btn.slot-btn--locked{color:#0000004d;border-color:#0000001a;border-style:dashed;background:transparent;cursor:not-allowed}.slot-btn:disabled:not(.slot-btn--locked){color:#00000059;border-color:#0000001a;background:#f0f0f0;cursor:not-allowed}.slot-icon{font-size:15px!important;width:15px!important;height:15px!important}.slot-legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:12px}.legend-item{display:flex;align-items:center;gap:6px;font-size:11px;color:#00000080;font-weight:500;text-transform:uppercase;letter-spacing:.04em}.legend-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.legend-dot.legend-dot--available{background:transparent;border:1.5px solid rgba(0,0,0,.2)}.legend-dot.legend-dot--unavailable{background:#f0f0f0;border:1.5px solid rgba(0,0,0,.1)}.legend-dot.legend-dot--selected{background:var(--mat-sys-primary);border:1.5px solid var(--mat-sys-primary)}.backend-error{color:var(--mat-sys-error, #d32f2f);font-size:14px;margin:0;padding:10px 14px;background:#fff3f3;border-radius:8px;border-left:3px solid currentColor}.submit-area{display:flex;align-items:center;gap:12px;padding:4px 0 16px}.submit-btn{padding:10px 28px!important;font-size:.9rem!important;font-weight:600!important;border-radius:10px!important;box-shadow:0 3px 10px #c628284d!important}.submit-btn .mdc-button__label{display:inline-flex;align-items:center;gap:6px}.back-btn{color:gray!important;margin-bottom:4px}