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64px;--app-sidebar-z: 920;--app-sidebar-backdrop-z: 910}.nav-bar{display:flex;align-items:center;justify-content:space-between;max-width:1100px;margin:0 auto;padding:0 2rem}.logo{font-size:1.5rem;font-weight:700;color:#fff;letter-spacing:2px}.nav-links{list-style:none;display:flex;align-items:center;gap:2rem;margin:0;padding:0}.nav-links li{display:flex;align-items:center}.nav-links li a{position:relative;display:inline-flex;align-items:center;color:#fff;text-decoration:none;font-weight:500;line-height:1;transition:color .2s}.nav-links li a:hover{color:var(--accent)}.nav-links li a:focus-visible,.logo:focus-visible{outline:2px solid var(--focus-ring-color);outline-offset:3px;border-radius:.4rem}.main-content{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 1rem;text-align:center}.main-content h1{font-size:2.5rem;font-weight:700;color:#1a2233;margin-bottom:2rem}.homepage-header{background:#000;padding:1rem 0;box-shadow:0 2px 8px #00000008}.app-shell-root{position:fixed;inset:0;display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:var(--app-topbar-height) minmax(0,1fr);width:100%;height:100vh;height:100dvh;min-height:0;overflow:hidden;background:var(--bg-app);color:var(--text-primary)}.homepage-header.app-topbar{position:relative;grid-row:1;top:0;z-index:940;height:var(--app-topbar-height);min-height:var(--app-topbar-height);padding:0;border-bottom:1px solid var(--border-subtle);background:color-mix(in srgb,var(--bg-surface) 96%,var(--bg-app));box-shadow:var(--shadow-sm)}.homepage-header.app-topbar .nav-bar{height:100%;min-height:var(--app-topbar-height);max-width:none;padding:0 1rem 0 1.15rem}.homepage-header.app-topbar .logo{color:var(--text-primary)}.app-topbar-actions{display:flex;align-items:center;gap:.55rem;min-width:0}.app-key-status-light{position:relative;display:inline-block;flex:0 0 auto;width:.66rem;height:.66rem;border:1px solid color-mix(in srgb,var(--success) 72%,var(--bg-surface));border-radius:999px;background:var(--success);box-shadow:0 0 0 .18rem color-mix(in srgb,var(--success-soft) 78%,transparent),0 0 .65rem color-mix(in srgb,var(--success) 42%,transparent);cursor:help}.app-key-status-light:after{position:absolute;top:calc(100% + .58rem);right:-.35rem;z-index:1100;width:max-content;max-width:min(18rem,calc(100vw - 1.5rem));padding:.46rem .58rem;border:1px solid var(--border-strong);border-radius:var(--radius-md);background:color-mix(in srgb,var(--bg-surface-strong) 96%,var(--bg-surface));color:var(--text-primary);box-shadow:var(--shadow-lg);content:attr(data-tooltip);font-size:.78rem;font-weight:700;line-height:1.3;opacity:0;overflow-wrap:anywhere;pointer-events:none;transform:translateY(-.14rem);transition:opacity .16s ease,transform .16s ease;white-space:normal}.app-key-status-light:hover:after,.app-key-status-light:focus-visible:after{opacity:1;transform:translateY(0)}.app-topbar-popover-anchor{position:relative;display:inline-flex;align-items:center}.daily-xp-meter{--daily-xp-progress: 0;display:inline-grid;grid-template-columns:minmax(3.6rem,1fr) auto;align-items:center;gap:.45rem;min-width:8.25rem;min-height:36px;padding:.32rem .62rem;border:1px solid color-mix(in srgb,var(--button-primary-bg) 32%,var(--border-subtle));border-radius:var(--radius-pill);background:color-mix(in srgb,var(--button-primary-bg) 9%,var(--bg-surface));color:var(--text-primary);box-shadow:var(--shadow-sm);cursor:pointer;font:inherit;text-align:left;transition:border-color .16s ease,background .16s ease,box-shadow .16s ease,transform .16s ease}.daily-xp-meter:hover,.daily-xp-meter:focus-visible{border-color:color-mix(in srgb,var(--button-primary-bg) 58%,var(--border-strong));background:color-mix(in srgb,var(--button-primary-bg) 14%,var(--bg-surface));box-shadow:var(--shadow-md);outline:none;transform:translateY(-1px)}.daily-xp-meter:focus-visible{box-shadow:0 0 0 3px color-mix(in srgb,var(--button-primary-bg) 22%,transparent),var(--shadow-md)}.daily-xp-meter.complete{border-color:color-mix(in srgb,var(--success) 42%,var(--border-subtle));background:color-mix(in srgb,var(--success-soft) 72%,var(--bg-surface))}.daily-xp-meter.pending{opacity:.78}.daily-xp-meter-track{display:block;width:100%;height:.42rem;overflow:hidden;border-radius:var(--radius-pill);background:color-mix(in srgb,var(--border-subtle) 72%,var(--bg-surface-muted))}.daily-xp-meter-fill{display:block;width:calc(var(--daily-xp-progress) * 100%);height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--button-primary-bg),color-mix(in srgb,var(--success) 80%,var(--button-primary-bg)));transition:width .24s ease}.daily-xp-meter.complete .daily-xp-meter-fill{background:var(--success)}.daily-xp-meter-value{display:inline-flex;align-items:baseline;color:var(--text-secondary);font-size:.78rem;font-weight:900;line-height:1;white-space:nowrap}.daily-xp-meter-value b{color:var(--text-primary);font-size:.94rem}.daily-xp-meter-unit{color:var(--text-muted)}.app-topbar-account-link{min-height:38px;padding:0 .8rem;border:1px solid var(--border-subtle);border-radius:var(--radius-pill);background:var(--button-secondary-bg);color:var(--button-secondary-text);font:inherit;font-size:.9rem;font-weight:800;cursor:pointer}.app-topbar-account-link:hover,.app-topbar-account-link:focus-visible{background:var(--button-secondary-hover);color:var(--text-primary)}.sidebar-toggle-btn{display:inline-flex;width:44px;min-width:44px;height:44px;align-items:center;justify-content:center;flex-direction:column;gap:4px;border:1px solid var(--border-subtle);border-radius:var(--radius-md);background:var(--button-secondary-bg);color:var(--text-primary);cursor:pointer;transition:background .2s ease,border-color .2s ease,transform .2s ease}.sidebar-toggle-btn:hover,.sidebar-toggle-btn:focus-visible{background:var(--button-secondary-hover);border-color:var(--border-strong)}.sidebar-toggle-btn span{display:block;width:18px;height:2px;border-radius:var(--radius-pill);background:currentColor;transition:transform .18s ease,opacity .18s ease}.sidebar-toggle-btn.is-open span:nth-child(1){transform:translateY(6px) rotate(45deg)}.sidebar-toggle-btn.is-open span:nth-child(2){opacity:0}.sidebar-toggle-btn.is-open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}.app-sidebar-toggle{position:fixed;top:calc(var(--app-topbar-height) + .85rem);left:.85rem;z-index:calc(var(--app-sidebar-z) + 4);box-shadow:var(--shadow-sm)}.app-sidebar-open.app-sidebar-wide .app-sidebar-toggle{left:calc(var(--app-sidebar-width) - 3.6rem)}.app-sidebar-open.app-sidebar-narrow .app-sidebar-toggle{left:calc(min(84vw,19rem) - 3.55rem)}.app-shell-main{grid-row:2;height:100%;min-height:0;min-width:0;overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain;scrollbar-gutter:stable;transition:padding-left .2s ease;-webkit-overflow-scrolling:touch}.app-sidebar-wide.app-sidebar-open .app-shell-main{padding-left:var(--app-sidebar-width)}.app-sidebar-wide.app-sidebar-closed .app-shell-main,.app-sidebar-narrow .app-shell-main{padding-left:0}.app-sidebar{position:fixed;top:var(--app-topbar-height);bottom:0;left:0;width:var(--app-sidebar-width);z-index:var(--app-sidebar-z);background:color-mix(in srgb,var(--bg-surface) 96%,var(--bg-app));border-right:1px solid var(--border-subtle);box-shadow:var(--shadow-md);transform:translate(-102%);transition:transform .2s ease;overflow:hidden}.app-sidebar.is-open{transform:translate(0)}.app-sidebar-inner{display:flex;flex-direction:column;height:100%;min-height:0;padding:1rem}.app-sidebar-head{min-height:3.65rem;padding:.25rem 3.15rem .85rem .25rem;border-bottom:1px solid var(--border-subtle)}.app-sidebar-kicker{color:var(--text-muted);font-size:.78rem;font-weight:900;letter-spacing:.12em;text-transform:uppercase}.app-sidebar-title{margin-top:.22rem;color:var(--text-primary);font-size:1.15rem;font-weight:900}.app-sidebar-nav{display:grid;gap:.25rem;padding:.85rem 0;overflow-y:auto}.app-sidebar-nav-item{display:flex;align-items:center;justify-content:space-between;gap:.75rem;min-height:44px;width:100%;padding:.55rem .7rem;border:1px solid transparent;border-radius:var(--radius-md);background:transparent;color:var(--text-secondary);font:inherit;text-align:left;cursor:pointer;transition:background .18s ease,border-color .18s ease,color .18s ease}.app-sidebar-nav-item:hover,.app-sidebar-nav-item:focus-visible{background:var(--button-secondary-bg);color:var(--text-primary)}.app-sidebar-nav-item.is-active{background:color-mix(in srgb,var(--button-primary-bg) 12%,var(--bg-surface));border-color:color-mix(in srgb,var(--button-primary-bg) 42%,var(--border-subtle));color:var(--text-primary)}.app-sidebar-nav-label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:850}.app-sidebar-nav-short{flex:0 0 auto;color:var(--text-muted);font-size:.78rem;font-weight:800}.app-sidebar-nav-item.is-active .app-sidebar-nav-short{color:color-mix(in srgb,var(--button-primary-bg) 75%,var(--text-primary))}:root[data-theme=light] .app-sidebar{--sidebar-on-nav-strong: #f7fbff;--sidebar-on-nav: #dbe7ff;--sidebar-on-nav-muted: #bdc9ec;--sidebar-on-nav-accent: #31d7cb;--sidebar-on-nav-active: #7ea6ff;color:var(--sidebar-on-nav)}:root[data-theme=light] .app-sidebar-kicker,:root[data-theme=light] .app-sidebar-nav-short,:root[data-theme=light] .app-sidebar-account-label{color:var(--sidebar-on-nav-muted)}:root[data-theme=light] .app-sidebar-title,:root[data-theme=light] .app-sidebar-nav-label,:root[data-theme=light] .app-sidebar-account-value{color:var(--sidebar-on-nav-strong)}:root[data-theme=light] .app-sidebar-nav-item,:root[data-theme=light] .app-sidebar-feedback{color:var(--sidebar-on-nav)}:root[data-theme=light] .app-sidebar-nav-item:hover,:root[data-theme=light] .app-sidebar-nav-item:focus-visible,:root[data-theme=light] .app-sidebar-feedback:hover,:root[data-theme=light] .app-sidebar-feedback:focus-visible{color:var(--sidebar-on-nav-strong)}:root[data-theme=light] .app-sidebar-nav-item.is-active{color:var(--sidebar-on-nav-strong)}:root[data-theme=light] .app-sidebar-nav-item.is-active .app-sidebar-nav-label{color:var(--sidebar-on-nav-active)}:root[data-theme=light] .app-sidebar-nav-item.is-active .app-sidebar-nav-short{color:var(--sidebar-on-nav-accent)}:root[data-theme=light] .app-sidebar-account{background:#ffffff14;border-color:#ffffff38}:root[data-theme=light] .app-sidebar-signin{background:#ffffff14;border-color:#ffffff38;color:var(--sidebar-on-nav-strong)}:root[data-theme=light] .app-sidebar-signin:hover,:root[data-theme=light] .app-sidebar-signin:focus-visible{background:#ffffff24;color:var(--sidebar-on-nav-strong)}.app-sidebar-footer{margin-top:auto;display:grid;gap:.75rem}.app-sidebar-feedback{min-height:40px;width:100%;border:1px solid var(--border-subtle);border-radius:var(--radius-md);background:transparent;color:var(--text-secondary);font:inherit;font-size:.9rem;font-weight:850;cursor:pointer;transition:background .18s ease,border-color .18s ease,color .18s ease}.app-sidebar-feedback:hover,.app-sidebar-feedback:focus-visible{background:var(--button-secondary-bg);border-color:color-mix(in srgb,var(--button-primary-bg) 34%,var(--border-subtle));color:var(--text-primary)}.app-sidebar-account-zone{padding-top:.85rem;border-top:1px solid var(--border-subtle)}.app-sidebar-account{display:grid;gap:.16rem;padding:.68rem .75rem;border:1px solid var(--border-subtle);border-radius:var(--radius-md);background:var(--bg-surface-muted)}.app-sidebar-account-label{color:var(--text-muted);font-size:.76rem;font-weight:900;letter-spacing:.1em;text-transform:uppercase}.app-sidebar-account-value{min-width:0;overflow:hidden;color:var(--text-primary);font-size:.9rem;font-weight:800;text-overflow:ellipsis;white-space:nowrap}.app-sidebar-signin{min-height:44px;width:100%;border:1px solid var(--border-subtle);border-radius:var(--radius-md);background:var(--button-secondary-bg);color:var(--button-secondary-text);font:inherit;font-weight:850;cursor:pointer}.app-sidebar-signin:hover,.app-sidebar-signin:focus-visible{background:var(--button-secondary-hover);color:var(--text-primary)}.app-sidebar-backdrop{position:fixed;inset:var(--app-topbar-height) 0 0;z-index:var(--app-sidebar-backdrop-z);border:0;background:#00000073;cursor:pointer}.app-sidebar-narrow{--app-topbar-height: calc(56px + env(safe-area-inset-top, 0px)) }.app-sidebar-narrow .app-sidebar{top:var(--app-topbar-height);width:min(84vw,19rem)}.mode-switch{display:inline-flex;gap:1.2rem;margin:3rem 0 2rem;background:#f5f5f5;border-radius:2rem;box-shadow:0 2px 12px #0000000a;padding:.3rem;align-items:center;min-height:0;max-width:420px;min-width:0}.mode-btn{background:none;border:none;outline:none;font-size:1.05rem;font-weight:600;color:#000;padding:.7rem 2.2rem;border-radius:1.5rem;cursor:pointer;transition:background .2s,color .2s,box-shadow .2s;position:relative;display:flex;align-items:center;gap:.4em;min-height:0;margin:0;box-sizing:border-box}.mode-btn.active{background:var(--accent);color:var(--button-primary-text);box-shadow:0 2px 8px #e539351f;border-radius:1.5rem}.mode-btn:not(.active):hover{background:#fce4e4;color:var(--accent)}.mode-btn:focus-visible{outline:2px solid var(--focus-ring-color);outline-offset:2px}.mode-content{width:100%;margin:0 auto;display:flex;flex-direction:column;align-items:center;justify-content:flex-start}.mode-panel{width:100%;background:#fff;border-radius:1.5rem;box-shadow:0 4px 24px #00000012;padding:2.5rem 2rem 2rem;margin-bottom:2rem;text-align:center;transition:box-shadow .2s}.transmit-panel h1,.receive-panel h1{font-size:2rem;font-weight:700;margin-bottom:1rem;color:var(--accent)}.mode-desc{color:#333;font-size:1.1rem;margin-bottom:0}.transmit-ui,.receive-ui{width:100%;background:#fff;border-radius:1.5rem;box-shadow:0 4px 24px #00000012;padding:2.5rem 2rem 1rem;margin-bottom:0;text-align:center;transition:box-shadow .2s;display:flex;flex-direction:column;align-items:center}.transmit-letter{font-size:3.5rem;font-weight:800;color:var(--accent);margin-bottom:1.5rem;letter-spacing:2px}.transmit-morse-display{min-height:2.5rem;font-size:2rem;letter-spacing:.5rem;color:#222;margin-bottom:1.5rem;background:#f5f5f5;border-radius:.75rem;padding:.5rem 1.5rem;display:inline-block}.placeholder{color:#bbb;font-size:1.1rem}.transmit-controls{display:flex;gap:1rem;margin-bottom:1.5rem;justify-content:center}.morse-key-btn{background:var(--accent);color:var(--button-primary-text);font-size:1.25rem;font-weight:700;border:none;border-radius:2rem;padding:1rem 2.5rem;cursor:pointer;transition:background .2s,box-shadow .2s;box-shadow:0 2px 8px #e539351a}.morse-key-btn.pressing{background:var(--accent-hover)}.backspace-btn,.submit-btn,.next-btn,.play-btn{background:#fff;color:var(--accent);border:2px solid var(--accent);border-radius:2rem;font-size:1.1rem;font-weight:600;padding:.75rem 1.5rem;cursor:pointer;transition:background .2s,color .2s}.backspace-btn:disabled,.submit-btn:disabled{opacity:.5;cursor:not-allowed}.submit-btn,.next-btn{margin-left:.5rem}.backspace-btn:hover,.submit-btn:hover,.next-btn:hover,.play-btn:hover{background:var(--accent);color:var(--button-primary-text)}.transmit-feedback,.receive-feedback{margin-top:1.5rem;font-size:1.2rem;font-weight:600;padding:1rem 1.5rem;border-radius:1rem;display:flex;flex-direction:column;align-items:center}.transmit-feedback.correct,.receive-feedback.correct{background:#e8f5e9;color:#388e3c;border:1.5px solid #388e3c}.transmit-feedback.incorrect,.receive-feedback.incorrect{background:#ffebee;color:var(--accent);border:1.5px solid var(--accent)}.play-btn{margin-bottom:1.5rem}.receive-form{display:flex;gap:1rem;justify-content:center;margin-bottom:1.5rem}.receive-input{font-size:2rem;font-weight:700;width:4rem;text-align:center;border:2px solid var(--accent);border-radius:.75rem;padding:.5rem;outline:none;color:var(--accent);background:#fff;transition:border .2s}.receive-input:focus{border:2px solid var(--accent-hover)}.keyboard-grid{display:grid;grid-template-columns:repeat(10,2.5rem);gap:.5rem;justify-content:center;margin:1.5rem 0}.keyboard-key{background:#fff;color:var(--accent);border:2px solid var(--accent);border-radius:.75rem;font-size:1.15rem;font-weight:700;padding:.75rem 0;cursor:pointer;transition:background .2s,color .2s;outline:none}.keyboard-key:hover:not(:disabled),.keyboard-key:focus:not(:disabled){background:var(--accent);color:var(--button-primary-text)}.keyboard-key:disabled{opacity:.5;cursor:not-allowed}.receive-status{display:flex;justify-content:center;align-items:center;margin-bottom:1.25rem;min-height:2.5rem}.receive-question{font-size:2.5rem;color:var(--accent);font-weight:800}.receive-feedback-text{font-size:1.5rem;font-weight:700}.receive-feedback-text.correct{color:#388e3c}.receive-feedback-text.incorrect{color:var(--accent)}.main-content-home{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 1rem;text-align:center}.main-content-home h1{font-size:2.5rem;font-weight:700;color:#1a2233;margin-bottom:2rem}.home-action-row{display:flex;justify-content:center;align-items:center;gap:.85rem;flex-wrap:wrap}.home-course-section{width:100%;padding:0 0 3rem;background:linear-gradient(180deg,#fff,#f7f9fc)}.home-course-teaser{max-width:860px;margin:0 auto 3rem;text-align:center}.course-page.embedded-home{margin-top:0}.get-started-btn{background:var(--accent);color:var(--button-primary-text);font-size:1.25rem;padding:.75rem 2.5rem;border:none;border-radius:.5rem;cursor:pointer;font-weight:600;transition:background .2s,color .2s;box-shadow:0 2px 8px #e5393514}.get-started-btn:hover{background:var(--accent-hover);color:var(--button-primary-text)}.home-secondary-btn{background:#fff;color:#1a2233;font-size:1.05rem;padding:.72rem 1.8rem;border:1px solid #d8dee9;border-radius:.5rem;cursor:pointer;font-weight:700;transition:background .2s,color .2s,border-color .2s;box-shadow:0 2px 8px #1a22330f}.home-secondary-btn:hover{background:#f4f7fb;border-color:#b8c2d4}.confirm-dialog{width:min(420px,calc(100vw - 2rem))}.confirm-dialog h3{margin:0 0 .65rem}.confirm-dialog p{margin:0;color:var(--text-muted, 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reduce){*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}}.daily-goal-card{margin-bottom:1rem;padding:1rem 1.1rem;border:1px solid var(--border-subtle);border-radius:var(--radius-lg, 12px);background:var(--bg-surface)}.daily-goal-card.met{border-color:color-mix(in srgb,var(--success) 55%,var(--border-subtle));background:color-mix(in srgb,var(--success-soft, var(--success)) 22%,var(--bg-surface))}.daily-goal-head{display:flex;align-items:center;justify-content:space-between;gap:1rem}.daily-goal-copy{min-width:0}.daily-goal-card h3{margin:.1rem 0 .2rem;font-size:clamp(1.05rem,1.3vw,1.3rem);line-height:1.15}.daily-goal-sub{margin:0;color:var(--text-secondary);font-size:.9rem;line-height:1.35}.daily-goal-ring{--goal-ratio: 0;position:relative;display:grid;place-items:center;width:4.2rem;height:4.2rem;flex:0 0 auto;border-radius:50%;background:radial-gradient(circle,var(--bg-surface) 0 58%,transparent 59%),conic-gradient(var(--accent) calc(var(--goal-ratio) * 360deg),color-mix(in srgb,var(--border-subtle) 70%,var(--bg-surface)) 0);color:var(--text-primary);font-weight:900;font-size:.92rem;font-variant-numeric:tabular-nums}.daily-goal-card.met .daily-goal-ring{background:radial-gradient(circle,var(--bg-surface) 0 58%,transparent 59%),conic-gradient(var(--success) 360deg,var(--success) 0)}.daily-goal-options{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem;margin-top:.9rem}.daily-goal-option{display:grid;gap:.1rem;padding:.5rem .4rem;border:1px solid var(--border-subtle);border-radius:var(--radius-md, 10px);background:color-mix(in srgb,var(--bg-surface-muted) 70%,transparent);color:var(--text-secondary);cursor:pointer;transition:border-color .15s ease,background .15s ease,transform .08s ease}.daily-goal-option:hover{transform:translateY(-1px)}.daily-goal-option b{color:var(--text-primary);font-size:.9rem}.daily-goal-option 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