:root,:root[data-theme=light]{color-scheme:light;--bg: #f6f8fa;--surface: #fff;--surface-sunken: #f6f8fa;--surface-hover: #f3f4f6;--surface-active: #edeff2;--text: #24292e;--text-muted: #57606a;--text-disabled: #959da5;--text-faint: #6a737d;--text-faintest: #c6cbd1;--border: rgba(27, 31, 35, .15);--border-soft: rgba(27, 31, 35, .1);--shadow: rgba(27, 31, 35, .06);--shadow-lifted: rgba(27, 31, 35, .12);--shadow-modal: rgba(27, 31, 35, .3);--link: #0969da;--accent: #54aeff;--accent-surface: #ddf4ff;--green: #2da44e;--green-hover: #2c974b;--green-strong: #1a7f37;--green-switch: #1f883d;--orange: #bc4c00;--orange-hover: #a34000;--orange-border: rgba(188, 76, 0, .25);--danger: #cf222e;--danger-surface: #ffebe9;--daily-gradient: linear-gradient(135deg, #fff 0%, #fff6e5 100%);--btn-bg: #fafbfc;--on-accent: #fff;--calendar-empty: #fff;--switch-off: #d0d7de;--switch-knob: #fff;--scrim: rgba(0, 0, 0, .6)}:root[data-theme=dark]{color-scheme:dark;--bg: #0d1117;--surface: #161b22;--surface-sunken: #0d1117;--surface-hover: #21262d;--surface-active: #262c36;--text: #e6edf3;--text-muted: #9198a1;--text-disabled: #6e7681;--text-faint: #8b949e;--text-faintest: #484f58;--border: rgba(240, 246, 252, .15);--border-soft: rgba(240, 246, 252, .1);--shadow: rgba(1, 4, 9, .5);--shadow-lifted: rgba(1, 4, 9, .7);--shadow-modal: rgba(1, 4, 9, .85);--link: #4493f8;--accent: #316dca;--accent-surface: #121d2f;--green: #238636;--green-hover: #2ea043;--green-strong: #3fb950;--green-switch: #238636;--orange: #db6d28;--orange-hover: #f0883e;--orange-border: rgba(219, 109, 40, .3);--danger: #f85149;--danger-surface: #2d1214;--daily-gradient: linear-gradient(135deg, #161b22 0%, #2b1d10 100%);--btn-bg: #21262d;--on-accent: #fff;--calendar-empty: #0d1117;--switch-off: #30363d;--switch-knob: #b1bac4;--scrim: rgba(1, 4, 9, .75)}:root{--safe-top: env(safe-area-inset-top, 0px);--safe-right: env(safe-area-inset-right, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-left: env(safe-area-inset-left, 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clamp(56px, 9vh, 64px)}.tb-button--tool{font-size:15px}}.tb-button-count{position:absolute;right:.2em;bottom:.1em;font-size:min(2.2vw,2.2vh,14px);line-height:1;color:var(--text-faint);pointer-events:none}.tb-button--exhausted{color:var(--text-disabled)}.tb-button--exhausted .tb-button-count{color:var(--text-faintest)}.tb-button--active{background-color:var(--accent-surface);border-color:var(--accent)}.tb-button:hover{background-color:var(--surface-hover);text-decoration:none;transition-duration:.1s}.tb-button:disabled{background-color:var(--btn-bg);border-color:var(--border);color:var(--text-disabled);cursor:default}.tb-button:active{background-color:var(--surface-active);box-shadow:#e1e4e833 0 1px inset;transition:none 0s}.tb-button:focus{outline:1px transparent}.tb-popover{position:absolute;z-index:3;box-sizing:border-box;min-width:200px;max-width:calc(100vw - 16px);padding:4px;background-color:var(--btn-bg);border:1px solid var(--border);border-radius:6px;box-shadow:var(--shadow-lifted) 0 4px 12px;color:var(--text);font-family:-apple-system,system-ui,Segoe UI,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji";font-size:15px;display:flex;flex-direction:column}.tb-menu-item{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:none;border:0;border-radius:4px;color:inherit;cursor:pointer;display:flex;align-items:center;gap:12px;min-height:44px;padding:6px 12px;font:inherit;text-align:left;touch-action:manipulation}.tb-menu-item svg{flex:none;width:1.4em;height:1.4em}.tb-menu-text{display:flex;flex-direction:column;gap:2px}.tb-menu-desc{font-size:.8em;color:var(--text-faint)}.tb-menu-item:hover:not(:disabled),.tb-menu-item:focus-visible{background-color:var(--surface-hover);outline:none}.tb-menu-item:active:not(:disabled){background-color:var(--surface-active)}.tb-menu-item:disabled{color:var(--text-disabled);cursor:default}.tb-menu-item--danger:not(:disabled){color:var(--danger)}.tb-confirm{display:flex;flex-direction:column;max-width:240px}.tb-confirm-text{margin:4px 12px 6px;line-height:1.35}.tb-confirm .tb-menu-item{justify-content:center}@media (max-height: 500px){.tb-popover{font-size:13px}.tb-menu-item{min-height:44px;padding:4px 10px;gap:10px}}.sb-bar{display:block;position:absolute;top:0;width:100%;box-sizing:border-box;padding:calc(12px + var(--safe-top)) var(--safe-right) 10px var(--safe-left);text-align:center;font-family:-apple-system,system-ui,Segoe UI,Helvetica,Arial,sans-serif,"Apple Color 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svg{display:block;width:100%;height:100%}.sb-pause:hover:not(:disabled){background-color:var(--surface-hover)}.sb-pause:disabled{opacity:.4;cursor:default}.sb-pause[aria-label=Resume]{color:var(--accent)}.back-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;position:fixed;top:var(--pin-top);left:var(--pin-left);right:var(--pin-right);z-index:2;width:var(--pin-size);height:var(--pin-size);border-radius:6px;border:1px solid var(--border);background-color:var(--btn-bg);box-shadow:#1b1f230a 0 1px,#ffffff40 0 1px inset;color:var(--text);cursor:pointer;padding:0;transition:background-color .2s cubic-bezier(.3,0,.5,1);display:flex;align-items:center;justify-content:center;touch-action:manipulation}.back-button:hover{background-color:var(--surface-hover)}.back-button:active{background-color:var(--surface-active)}.back-button svg{width:56%;height:56%}.cs-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:3;display:flex;align-items:center;justify-content:center;background:var(--scrim)}.cs-card{min-width:240px;padding:24px 32px;background:var(--surface);border-radius:8px;color:var(--text);text-align:center}.cs-streak{color:var(--orange);font-weight:600}.cs-record{color:var(--green-strong);font-weight:600}.cs-record-previous{display:block;font-weight:400;font-size:.85em}.cs-next{margin-right:8px}.cs-share{display:block;margin:12px auto}.fs-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:3;display:flex;align-items:center;justify-content:center;background:var(--scrim)}.fs-card{min-width:240px;padding:24px 32px;background:var(--surface);border-radius:8px;color:var(--text);text-align:center}.fs-title{margin-top:0;color:var(--danger)}.fs-marks{margin:0 0 12px;color:var(--danger);font-size:1.6em;letter-spacing:.25em;text-indent:.25em}.fs-note{color:var(--text-muted);font-size:.85em}.fs-retry{margin-right:8px}.ro-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:4;display:flex;align-items:center;justify-content:center;padding:calc(16px + var(--safe-top)) calc(16px + var(--safe-right)) calc(16px + var(--safe-bottom)) calc(16px + var(--safe-left));background:var(--scrim);font-family:-apple-system,system-ui,Segoe UI,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji"}.ro-card{max-width:420px;max-height:100%;overflow-y:auto;padding:20px 24px;background:var(--surface);border-radius:10px;box-shadow:var(--shadow-modal) 0 8px 24px;color:var(--text);text-align:left}.ro-title{margin:0;font-size:1.25em}.ro-lead{margin:2px 0 0;color:var(--text-muted);font-size:.9em}.ro-rules{margin:16px 0 0;padding-left:20px;line-height:1.5}.ro-rules li+li{margin-top:8px}.ro-example{margin:16px 0 0;padding:10px 12px;background:var(--surface-sunken);border-left:3px solid var(--accent);border-radius:4px;color:var(--text-muted);font-size:.9em}.ro-close{-webkit-appearance:none;-moz-appearance:none;appearance:none;margin-top:20px;width:100%;padding:10px 16px;background-color:var(--green);border:none;border-radius:6px;color:var(--on-accent);cursor:pointer;font-size:1em}.ro-close:hover{background-color:var(--green-hover)}.mode-toggle{display:flex;justify-content:center;gap:0;margin-bottom:8px}.mode-toggle-option{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--surface);border:1px solid var(--border);color:var(--text-muted);cursor:pointer;font-size:.9em;padding:6px 18px}.mode-toggle-option:first-child{border-radius:6px 0 0 6px}.mode-toggle-option:last-child{border-radius:0 6px 6px 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var(--border-soft);border-radius:6px;margin-bottom:12px}.track-card-label{margin:0 0 8px;color:var(--text);font-size:1em;white-space:nowrap}.track-card-summary{margin:0 0 8px;color:var(--text-muted);font-size:.8em;line-height:1.35;text-align:left;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;line-clamp:3;overflow:hidden}.track-card-level{margin:0 0 12px;color:var(--text-muted);font-size:.95em}.track-card-difficulty{text-transform:capitalize}.track-card-cta{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-color:var(--green);border:none;border-radius:6px;color:var(--on-accent);cursor:pointer;font-size:1em;padding:8px 16px;width:100%}.track-card-cta:hover{background-color:var(--green-hover)}.track-card-cta:active{filter:brightness(.9)}.free-screen{position:fixed;top:0;right:0;bottom:0;left:0;overflow-y:auto;background:var(--surface-sunken);padding:calc(24px + var(--safe-top)) calc(16px + var(--safe-right)) calc(48px + var(--safe-bottom)) calc(16px + var(--safe-left));font-family:-apple-system,system-ui,Segoe UI,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji"}.free-title{text-align:center;color:var(--text);margin-bottom:8px}.free-subtitle{margin:0 0 24px;text-align:center;color:var(--text-muted);font-size:.9em}.free-difficulties{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-bottom:20px}.free-difficulty{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--surface);border:1px solid var(--border);border-radius:999px;color:var(--text-muted);cursor:pointer;font-size:1em;padding:8px 22px;text-transform:capitalize}.free-difficulty:hover{background:var(--surface-hover)}.free-difficulty:active{background:var(--surface-active)}.free-difficulty.free-difficulty--on{background:var(--green);border-color:var(--green);color:var(--on-accent);font-weight:600}.free-difficulty.free-difficulty--on:active{background:var(--green);filter:brightness(.9)}.free-count{margin:0 auto 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var(--border-soft)}.settings-row:hover{background:var(--surface-sunken)}.settings-row-text{display:flex;flex:1 1 auto;flex-direction:column;gap:4px;min-width:0}.settings-row-label{color:var(--text);font-weight:600}.settings-row-description{color:var(--text-muted);font-size:.85em;line-height:1.4}.settings-switch{-moz-appearance:none;appearance:none;-webkit-appearance:none;flex:0 0 auto;position:relative;width:44px;height:26px;margin:0;border-radius:13px;background:var(--switch-off);cursor:pointer;transition:background .15s ease-in-out}.settings-switch:after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:var(--switch-knob);box-shadow:#1b1f2340 0 1px 2px;transition:transform .15s ease-in-out}.settings-switch:checked{background:var(--green-switch)}.settings-switch:checked:after{transform:translate(18px)}.settings-switch:focus-visible{outline:2px solid var(--link);outline-offset:2px}.settings-note{color:var(--text-muted);font-size:.85em;text-align:center;line-height:1.5}.settings-note a{color:var(--link);text-decoration:none}.settings-note a:hover{text-decoration:underline}.stats-screen{position:fixed;top:0;right:0;bottom:0;left:0;overflow-y:auto;background:var(--surface-sunken);padding:calc(24px + var(--safe-top)) calc(16px + var(--safe-right)) calc(48px + var(--safe-bottom)) calc(16px + var(--safe-left));font-family:-apple-system,system-ui,Segoe UI,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji"}.stats-title{text-align:center;color:var(--text);margin-bottom:24px}.stats-body{max-width:900px;margin:0 auto}.stats-empty{text-align:center;color:var(--text-muted)}.stats-empty a{color:var(--link)}.stats-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:16px;margin-bottom:32px}.stats-card{display:flex;flex-direction:column;align-items:center;gap:4px;background:var(--surface);border:1px solid 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2px}.daily-card-thumb{width:72px;height:72px;flex-shrink:0;object-fit:cover;background:var(--surface-sunken);border:1px solid var(--border-soft);border-radius:6px}.daily-card-body{flex:1;min-width:0}.daily-card-title{display:flex;align-items:center;gap:8px;margin:0 0 4px;color:var(--text);font-size:1.1em}.daily-card-check{color:var(--green-strong);font-weight:700}.daily-card-meta{margin:0;color:var(--text-muted);font-size:.9em}.daily-card-difficulty{text-transform:capitalize}.daily-card-streak{margin:4px 0 0;color:var(--orange);font-size:.9em;font-weight:600}.daily-card-cta{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-color:var(--orange);border:none;border-radius:6px;color:var(--on-accent);cursor:pointer;flex-shrink:0;font-size:1em;padding:8px 20px}.daily-card-cta:hover{background-color:var(--orange-hover)}.daily-card-cta:active{filter:brightness(.9)}.track-overlay-guides{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 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a:hover{text-decoration:underline}.landing-more{display:flex;flex-wrap:wrap;gap:8px 18px}.landing-foot{margin:0;padding-top:16px;border-top:1px solid var(--border-soft);color:var(--text-muted);font-size:.9em}@media (max-width: 560px){.landing-header{flex-direction:column;align-items:flex-start;gap:14px}.landing-title{font-size:1.6em}}