@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-cyrillic-ext-wght-normal-DjL33-gN.woff2) format("woff2-variations");unicode-range:U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-cyrillic-wght-normal-BEAKL7Jp.woff2) format("woff2-variations");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-vietnamese-wght-normal-6IgcOCM7.woff2) format("woff2-variations");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-latin-ext-wght-normal-DC-KSUi6.woff2) format("woff2-variations");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-latin-wght-normal-BgDaEnEv.woff2) format("woff2-variations");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:DM Mono;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/dm-mono-latin-ext-400-normal-C2zvOubV.woff2) format("woff2"),url(/assets/dm-mono-latin-ext-400-normal-1aZr6b2b.woff) format("woff");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:DM Mono;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/dm-mono-latin-400-normal-4GdczIuU.woff2) format("woff2"),url(/assets/dm-mono-latin-400-normal--0xN8mdc.woff) format("woff");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:DM Mono;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/dm-mono-latin-ext-500-normal-BtRyHRi6.woff2) format("woff2"),url(/assets/dm-mono-latin-ext-500-normal-Dw3M13d8.woff) format("woff");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:DM Mono;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/dm-mono-latin-500-normal-DRMDZjhP.woff2) format("woff2"),url(/assets/dm-mono-latin-500-normal-CN8Miw6E.woff) format("woff");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}.error-state{display:grid;width:100%;min-width:0;place-items:center;padding:clamp(1.25rem,4vw,3rem);color:var(--color-text);background:var(--color-background, var(--color-canvas))}.error-state--full{min-height:min(34rem,70dvh)}.error-state--panel{min-height:15rem;height:100%}.error-state--compact{min-height:9rem;padding:1.25rem}.error-state__content{width:min(100%,38rem);padding:clamp(1.5rem,4vw,2.5rem);text-align:center;background:var(--color-surface);border:1px solid var(--color-border-fixed);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm)}.error-state--compact .error-state__content{padding:1.25rem}.error-state__icon{display:grid;width:3.5rem;height:3.5rem;margin:0 auto 1.25rem;place-items:center;color:var(--color-accent);background:var(--color-accent-subtle);border-radius:1rem}.error-state--failure .error-state__icon,.error-state--network .error-state__icon{color:var(--color-danger);background:color-mix(in srgb,var(--color-danger) 10%,var(--color-surface))}.error-state__icon svg{width:1.75rem;height:1.75rem}.error-state .error-state__content>:is(h1,h2){margin:0;color:var(--color-text);font-size:1.5rem;line-height:1.25;letter-spacing:var(--letter-spacing-heading)}.error-state .error-state__description{margin:1rem 0 0;color:var(--color-text-muted);font-size:1rem;line-height:1.6}.error-state .error-state__reference{margin:1rem 0 0;color:var(--color-text-muted);font-family:var(--font-family-mono);font-size:.875rem;overflow-wrap:anywhere}.error-state__actions{display:flex;justify-content:center;flex-wrap:wrap;gap:.75rem;margin-top:1.5rem}.error-state__actions .button{display:inline-flex;min-height:2.75rem;align-items:center;justify-content:center;gap:.5rem;font-size:1rem}.error-state__actions svg{width:1rem;height:1rem}.global-error-page{display:grid;min-height:100dvh;place-items:center;color:var(--color-text);background:var(--color-background, var(--color-canvas))}.global-error-page .error-state{min-height:100dvh}@media(max-width:42rem){.error-state__actions{flex-direction:column}.error-state__actions .button{width:100%}}:root{--color-canvas: #f8fafc;--color-surface: #ffffff;--color-surface-subtle: #f1f0eb;--color-surface-raised: #faf9f6;--color-surface-inverse: #202321;--color-text: #111111;--color-text-secondary: #374151;--color-text-muted: #6b7280;--color-text-inverse: #ffffff;--color-text-on-inverse: #e6e9e6;--color-border: #deddd6;--color-border-strong: #cbc9c1;--color-border-fixed: #F1F5F9;--color-progress-track-fixed: #F1F5F9;--color-neutral-surface-fixed: #F1F5F9;--color-text-on-neutral-fixed: #111111;--color-accent: #2563eb;--color-accent-hover: #1d4ed8;--color-accent-soft: #dbeafe;--color-accent-subtle: #eff6ff;--color-brand-soft-surface: #f1f5f9;--color-text-on-accent: #ffffff;--color-focus: rgb(37 99 235 / 32%);--color-brand-gradient-base: #0b1220;--color-coin: #b7791f;--color-danger: #a85b56;--color-danger-soft: #f3e9e7;--color-success: #3f6658;--color-success-soft: #e5eee9;--color-warning: #8a642d;--color-warning-soft: #f6eee0;--color-warning-subtle: var(--color-warning-soft);--color-info: #426178;--color-info-soft: #e6edf2;--color-code-surface: #171c19;--color-code-surface-raised: #202722;--color-code-border: #344039;--color-code-text: #e4ebe7;--color-overlay: rgb(31 34 31 / 25%);--difficulty-easy-base: #b8e8c5;--difficulty-easy-bg: color-mix(in srgb, var(--difficulty-easy-base) 50%, transparent);--difficulty-easy-fg: #116b32;--difficulty-medium-base: #ffd66b;--difficulty-medium-bg: color-mix(in srgb, var(--difficulty-medium-base) 50%, transparent);--difficulty-medium-fg: #92400e;--difficulty-hard-base: #ffb3be;--difficulty-hard-bg: color-mix(in srgb, var(--difficulty-hard-base) 50%, transparent);--difficulty-hard-fg: #b91c1c;--certificate-color-ink: #29352f;--certificate-color-paper: #f7f5ee;--certificate-color-brand: var(--color-accent);--certificate-color-on-brand: #ffffff;--certificate-color-rule: #c9c4b8;--certificate-color-muted: #657169;--certificate-color-kicker: #607268;--certificate-color-sample: #9a3d68;--shadow-xs: 0 1px 2px rgb(32 35 33 / 4%);--shadow-sm: 0 6px 18px rgb(38 40 37 / 6%);--shadow-md: 0 12px 28px rgb(38 40 37 / 8%);--shadow-lg: 0 20px 44px rgb(35 38 35 / 11%);--shadow-panel: 10px 0 28px rgb(33 35 32 / 10%);--shadow-control: 0 2px 7px rgb(32 43 39 / 12%);--canvas: var(--color-canvas);--surface: var(--color-surface);--surface-muted: var(--color-surface-subtle);--surface-dark: var(--color-surface-inverse);--ink: var(--color-text);--muted: var(--color-text-muted);--line: var(--color-border);--accent: var(--color-accent);--accent-soft: var(--color-accent-soft);--danger: var(--color-danger)}:is(:root,.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-theme=dark]{--color-canvas: #171a18;--color-surface: #222522;--color-surface-subtle: #272a27;--color-surface-raised: #1f221f;--color-surface-inverse: #111311;--color-text: #f5f5f5;--color-text-secondary: #d1d5db;--color-text-muted: #9ca3af;--color-text-inverse: #18201c;--color-text-on-inverse: #e6e9e6;--color-border: #393d39;--color-border-strong: #4b504b;--color-accent: #60a5fa;--color-accent-hover: #93c5fd;--color-accent-soft: #172554;--color-accent-subtle: #0f172a;--color-brand-soft-surface: #1b2638;--color-text-on-accent: #0b1220;--color-focus: rgb(96 165 250 / 42%);--color-brand-gradient-base: #0b1220;--color-coin: #facc15;--color-danger: #d1908a;--color-danger-soft: #3a2927;--color-success: #95bfaa;--color-success-soft: #263a31;--color-warning: #ddb46e;--color-warning-soft: #3c3222;--color-warning-subtle: var(--color-warning-soft);--color-info: #91b8d0;--color-info-soft: #263640;--color-code-surface: #111512;--color-code-surface-raised: #1a211d;--color-code-border: #37443d;--color-code-text: #e2e9e5;--color-overlay: rgb(5 7 5 / 55%);--difficulty-easy-bg: var(--difficulty-easy-base);--difficulty-medium-bg: var(--difficulty-medium-base);--difficulty-hard-bg: var(--difficulty-hard-base);--shadow-xs: 0 2px 14px rgb(0 0 0 / 18%);--shadow-sm: 0 8px 25px rgb(0 0 0 / 20%);--shadow-md: 0 14px 34px rgb(0 0 0 / 24%);--shadow-lg: 0 16px 35px rgb(0 0 0 / 28%);--shadow-panel: 15px 0 40px rgb(0 0 0 / 32%);--shadow-control: 0 5px 14px rgb(0 0 0 / 30%)}:is(:root,.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-brand-theme=ember]{--color-accent: #c45a12;--color-accent-hover: #a9480c;--color-accent-soft: #fbe8d9;--color-accent-subtle: #fff4eb;--color-brand-soft-surface: #fff7ed;--color-text-on-accent: #ffffff;--color-focus: rgb(196 90 18 / 32%)}:is(:root,.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-brand-theme=violet]{--color-accent: #7c3aed;--color-accent-hover: #6d28d9;--color-accent-soft: #ede9fe;--color-accent-subtle: #f5f3ff;--color-brand-soft-surface: #f5f3ff;--color-text-on-accent: #ffffff;--color-focus: rgb(124 58 237 / 32%)}:is(:root,.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-brand-theme=crimson]{--color-accent: #be123c;--color-accent-hover: #9f1239;--color-accent-soft: #ffe4e6;--color-accent-subtle: #fff1f2;--color-brand-soft-surface: #fff1f2;--color-text-on-accent: #ffffff;--color-focus: rgb(190 18 60 / 32%)}:is(:root,.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-brand-theme=cyber]{--color-accent: #0f766e;--color-accent-hover: #115e59;--color-accent-soft: #ccfbf1;--color-accent-subtle: #f0fdfa;--color-brand-soft-surface: #ecfeff;--color-text-on-accent: #ffffff;--color-focus: rgb(15 118 110 / 32%)}:is(.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-theme=dark][data-brand-theme=ember]{--color-accent: #f59e42;--color-accent-hover: #ffad5c;--color-accent-soft: #3a2518;--color-accent-subtle: #261b14;--color-brand-soft-surface: #30251d;--color-text-on-accent: #17130f;--color-focus: rgb(245 158 66 / 42%)}:is(.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-theme=dark][data-brand-theme=violet]{--color-accent: #a78bfa;--color-accent-hover: #c4b5fd;--color-accent-soft: #2e1065;--color-accent-subtle: #1e1b4b;--color-brand-soft-surface: #28223a;--color-text-on-accent: #160b2e;--color-focus: rgb(167 139 250 / 42%)}:is(.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-theme=dark][data-brand-theme=crimson]{--color-accent: #fb7185;--color-accent-hover: #fda4af;--color-accent-soft: #4c0519;--color-accent-subtle: #2b1018;--color-brand-soft-surface: #302127;--color-text-on-accent: #2b0710;--color-focus: rgb(251 113 133 / 42%)}:is(.app-shell,.dashboard-shell,.course-overview-shell,.home-shell,.application-shell,.exam-experience,.practice-immersive-shell)[data-theme=dark][data-brand-theme=cyber]{--color-accent: #2dd4bf;--color-accent-hover: #5eead4;--color-accent-soft: #134e4a;--color-accent-subtle: #0f2927;--color-brand-soft-surface: #172e2c;--color-text-on-accent: #05201d;--color-focus: rgb(45 212 191 / 42%)}.compiler-ide[data-editor-theme]{color:var(--editor-text);background:var(--editor-background);border-color:var(--editor-border)}.desktop-compiler .compiler-ide[data-editor-theme]{border-radius:var(--radius-xl) 0 0 var(--radius-xl)}.desktop-compiler .compiler-ide[data-editor-theme] .compiler-language-label{font-size:1rem}.desktop-compiler .compiler-ide[data-editor-theme] .ide-result-tabs button,.desktop-compiler .compiler-ide[data-editor-theme] .ide-runtime-status{font-size:.875rem}.compiler-ide[data-editor-theme=ycoders-dark]{--editor-background:#171c19;--editor-surface:#202722;--editor-panel:#171c19;--editor-text:#e4ebe7;--editor-muted:#a7b0aa;--editor-border:#3f4b44;--editor-divider:#46534b;--editor-control-border:#536159;--editor-accent:#60a5fa;--editor-focus:#60a5fa}.compiler-ide[data-editor-theme=ycoders-light]{--editor-background:#fff;--editor-surface:#f8fafc;--editor-panel:#fff;--editor-text:#111827;--editor-muted:#6b7280;--editor-border:#d1d5db;--editor-divider:#c7cdd6;--editor-control-border:#b9c1cc;--editor-accent:#2563eb;--editor-focus:#2563eb}.compiler-ide[data-editor-theme=amoled]{--editor-background:#000;--editor-surface:#050505;--editor-panel:#080808;--editor-text:#f5f5f5;--editor-muted:#a3a3a3;--editor-border:#2d2d2d;--editor-divider:#383838;--editor-control-border:#454545;--editor-accent:#22d3ee;--editor-focus:#22d3ee}.compiler-ide[data-editor-theme=cream]{--editor-background:#fff9ec;--editor-surface:#f6eedc;--editor-panel:#fbf2de;--editor-text:#2b2419;--editor-muted:#756a59;--editor-border:#d8cdb7;--editor-divider:#c9bda5;--editor-control-border:#b9aa8e;--editor-accent:#9a5b13;--editor-focus:#9a5b13}.compiler-ide[data-editor-theme=github-dark]{--editor-background:#0d1117;--editor-surface:#161b22;--editor-panel:#0d1117;--editor-text:#c9d1d9;--editor-muted:#8b949e;--editor-border:#30363d;--editor-divider:#3d444d;--editor-control-border:#484f58;--editor-accent:#58a6ff;--editor-focus:#58a6ff}.compiler-ide[data-editor-theme=github-light]{--editor-background:#fff;--editor-surface:#f6f8fa;--editor-panel:#fff;--editor-text:#1f2328;--editor-muted:#656d76;--editor-border:#d0d7de;--editor-divider:#afb8c1;--editor-control-border:#8c959f;--editor-accent:#0969da;--editor-focus:#0969da}.compiler-ide[data-editor-theme] .ide-header,.compiler-ide[data-editor-theme] .ide-result-tabs,.compiler-ide[data-editor-theme] .ide-result-footer{color:var(--editor-text);background:var(--editor-surface);border-color:var(--editor-divider)}.compiler-ide[data-editor-theme] .compiler-workspace,.compiler-ide[data-editor-theme] .compiler-main-row,.compiler-ide[data-editor-theme] .editor-window,.compiler-ide[data-editor-theme] .monaco-loading-state{color:var(--editor-text);background:var(--editor-background);border-color:var(--editor-divider)}.compiler-ide[data-editor-theme] .ide-results.console-window,.compiler-ide[data-editor-theme] .ide-result-terminal{color:var(--editor-text);background:var(--editor-panel);border-color:var(--editor-border)}.compiler-ide[data-editor-theme] .compiler-language-label,.compiler-ide[data-editor-theme] .ide-header .icon-button,.compiler-ide[data-editor-theme] .ide-result-tabs button.is-active,.compiler-ide[data-editor-theme] .ide-runtime-status strong,.compiler-ide[data-editor-theme] .ide-result-terminal pre{color:var(--editor-text)}.compiler-ide[data-editor-theme] .ide-header .icon-button,.compiler-ide[data-editor-theme] .ide-check-button{color:var(--editor-text);background:var(--editor-surface);border-color:var(--editor-control-border)}.compiler-ide[data-editor-theme] .ide-header .icon-button:hover,.compiler-ide[data-editor-theme] .ide-check-button:hover:not(:disabled),.compiler-ide[data-editor-theme] .ide-result-tabs button:hover{color:var(--editor-text);background:color-mix(in srgb,var(--editor-surface) 82%,var(--editor-accent))}.compiler-ide[data-editor-theme] .ide-header .compiler-run-button,.compiler-ide[data-editor-theme] .ide-header .compiler-run-button:hover:not(:disabled){color:#fff;background:var(--editor-accent);border-color:var(--editor-accent)}.compiler-ide[data-editor-theme] .ide-result-tabs button,.compiler-ide[data-editor-theme] .ide-runtime-status{color:var(--editor-muted)}.compiler-ide[data-editor-theme] .ide-result-tabs button.is-active:after{background:var(--editor-accent)}.compiler-ide[data-editor-theme] .output-resize-handle{background:var(--editor-surface);border-color:var(--editor-divider)}.compiler-ide[data-editor-theme] :is(button,.resize-handle):focus-visible{outline:2px solid var(--editor-focus);outline-offset:2px}.compiler-ide[data-editor-theme] *{scrollbar-color:var(--editor-control-border) var(--editor-panel)}:root{--font-family-sans: "Geist Variable", "Geist", "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-family-mono: "DM Mono", monospace;--font-size-xs: .6875rem;--font-size-sm: .8125rem;--font-size-md: .9375rem;--font-size-lg: 1.0625rem;--font-size-reading: 1rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.625rem;--font-size-3xl: 2.125rem;--font-size-4xl: 3.125rem;--font-size-base: var(--font-size-md);--font-size-display: clamp(2.25rem, 4vw, 3.5rem);--font-size-page-title: clamp(2rem, 3vw, 2.75rem);--font-size-section-title: clamp(1.35rem, 2vw, 1.75rem);--font-size-subsection-title: 1.125rem;--font-size-body: clamp(.9375rem, .25vw + .9rem, 1.0625rem);--font-size-meta: var(--font-size-sm);--font-weight-regular: 400;--font-weight-normal: var(--font-weight-regular);--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--line-height-tight: 1.15;--line-height-heading: 1.3;--line-height-body: 1.68;--line-height-code: 1.7;--letter-spacing-heading: -.035em;--letter-spacing-label: .12em;--space-0: 0;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-7: 1.75rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem;--radius-xs: .375rem;--radius-sm: .5rem;--radius-md: .625rem;--radius-lg: .8125rem;--radius-xl: 1rem;--radius-full: 999px;--icon-xs: .8125rem;--icon-sm: .9375rem;--icon-md: 1.0625rem;--icon-lg: 1.25rem;--icon-xl: 1.375rem;--icon-size-md: var(--icon-md);--control-height-sm: 2.125rem;--control-height-md: 2.375rem;--control-height-lg: 2.625rem;--duration-fast: .14s;--duration-normal: .22s;--duration-slow: .32s;--ease-standard: cubic-bezier(.2, 0, 0, 1);--ease-emphasized: cubic-bezier(.2, .75, .25, 1);--layout-topbar-height: 3.75rem;--layout-sidebar-width: 17.375rem;--layout-sidebar-width-collapsed: 3.75rem;--layout-compiler-width: 25rem;--layout-compiler-width-tablet: 21.875rem;--layout-topbar-height-mobile: 4.125rem;--topbar-height: var(--layout-topbar-height);--sidebar-width: var(--layout-sidebar-width);--compiler-width: var(--layout-compiler-width)}.button{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-height:var(--control-height-md);padding-inline:var(--space-3);color:var(--color-text);background:transparent;border:1px solid transparent;border-radius:var(--radius-md);font-size:var(--font-size-sm);font-weight:var(--font-weight-bold);cursor:pointer;transition:color var(--duration-fast) var(--ease-standard),background var(--duration-fast) var(--ease-standard),border-color var(--duration-fast) var(--ease-standard),box-shadow var(--duration-fast) var(--ease-standard),transform var(--duration-fast) var(--ease-standard)}.button:hover:not(:disabled){transform:none}.button:active:not(:disabled){transform:scale(.98);transition-duration:70ms}.button:focus-visible{outline:3px solid var(--color-focus);outline-offset:2px}.button:disabled{cursor:not-allowed;opacity:.5}.button--primary{color:var(--color-text-on-accent);background:var(--color-accent);box-shadow:var(--shadow-control)}.button--primary:hover:not(:disabled){background:var(--color-accent-hover)}.button--danger{color:var(--color-text-on-accent);background:var(--color-danger)}.button--danger:hover:not(:disabled){background:color-mix(in srgb,var(--color-danger) 86%,black)}.button--secondary{background:var(--color-surface);border-color:var(--color-border)}.button--ghost{color:var(--color-accent);background:transparent;border-color:var(--color-border)}.button--text{min-height:auto;padding:0;border:0}.button--icon{width:var(--control-height-md);padding:0;color:var(--color-text-muted);background:transparent;border-color:var(--color-border)}.button--icon:hover:not(:disabled){color:var(--color-text);background:var(--color-surface-subtle);transform:none}.card{border:1px solid var(--color-border);border-radius:var(--radius-lg)}.card--surface{background:var(--color-surface)}.card--muted{background:var(--color-surface-subtle)}.card--accent{background:var(--color-accent-soft);border-color:color-mix(in srgb,var(--color-accent) 26%,var(--color-border))}.card--inverse{color:var(--color-text-on-inverse);background:var(--color-surface-inverse);border-color:color-mix(in srgb,var(--color-surface-inverse) 82%,white)}.card--elevated{background:var(--color-surface);box-shadow:var(--shadow-sm)}.card--interactive{transition:border-color var(--duration-fast) var(--ease-standard),box-shadow var(--duration-fast) var(--ease-standard),transform var(--duration-fast) var(--ease-standard)}.card--interactive:hover{border-color:var(--color-border-strong);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.input-control{min-height:var(--control-height-md);padding-inline:var(--space-3);color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);font:inherit;transition:border-color var(--duration-fast) var(--ease-standard),box-shadow var(--duration-fast) var(--ease-standard)}.input-control:hover{border-color:var(--color-border-strong)}.input-control:focus-visible{border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-focus);outline:0}.input-control::placeholder{color:var(--color-text-muted);opacity:.8}.input-control:disabled{color:var(--color-text-muted);background:var(--color-surface-subtle);cursor:not-allowed}.text-label{font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);letter-spacing:var(--letter-spacing-label);text-transform:uppercase}.text-body{font-size:var(--font-size-md);line-height:var(--line-height-body)}.dialog-backdrop{position:fixed;z-index:300;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;padding:var(--space-4);background:var(--color-overlay)}.dialog-surface{width:min(30rem,100%);padding:var(--space-6);color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg)}.dialog-surface>h2{margin:0;font-size:var(--font-size-xl);line-height:var(--line-height-heading)}.dialog-surface>p{margin:var(--space-3) 0 0;color:var(--color-text-muted);line-height:var(--line-height-body)}.confirm-dialog-actions{display:flex;justify-content:flex-end;gap:var(--space-3);margin-top:var(--space-6)}.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}@media(max-width:38rem){.dialog-surface{padding:var(--space-5)}.confirm-dialog-actions{flex-direction:column-reverse}.confirm-dialog-actions .button{width:100%}}@media(prefers-reduced-motion:reduce){.dialog-backdrop,.dialog-surface{animation:none!important;transition:none!important}}:root{font-family:var(--font-family-sans);color:var(--color-text);background:var(--color-canvas);font-synthesis:none}*{box-sizing:border-box}html,body,#root{width:100%;height:100%;margin:0}body{overflow:auto}button,input,select,textarea{font-family:var(--font-family-sans)}button{font:inherit}button:focus-visible,[role=separator]:focus-visible,a:focus-visible{outline:3px solid var(--color-focus);outline-offset:var(--space-1)}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.difficulty-badge{display:inline-flex;width:max-content;align-items:center;padding:var(--space-1) var(--space-2);border:1px solid currentColor;border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);line-height:1.2;text-transform:capitalize}.difficulty-badge--easy{color:var(--difficulty-easy-fg);background:var(--difficulty-easy-bg)}.difficulty-badge--medium{color:var(--difficulty-medium-fg);background:var(--difficulty-medium-bg)}.difficulty-badge--hard{color:var(--difficulty-hard-fg);background:var(--difficulty-hard-bg)}html{scroll-behavior:smooth}body{color:var(--color-text);background:var(--color-canvas);font-size:var(--font-size-base);line-height:var(--line-height-body);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}::selection{color:var(--color-text);background:var(--color-accent-soft)}:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:3px solid var(--color-focus);outline-offset:2px}:where(h1,h2,h3,h4){color:var(--color-text);line-height:var(--line-height-heading);letter-spacing:var(--letter-spacing-heading);text-wrap:balance}:where(p,li){text-wrap:pretty}:is(.home-main,.practice-page,.practice-detail,.challenges-page,.library-page,.settings-page,.certificates-page,.referrals-page,.projects-page,.placeholder-page){width:min(calc(100% - clamp(2rem,6vw,6rem)),86rem);margin-inline:auto}:is(.home-main,.practice-page,.challenges-page,.library-page,.certificates-page,.referrals-page,.projects-page) :is(h1,.page-title){font-size:var(--font-size-page-title);line-height:1.08}:is(.home-section,.practice-section,.challenge-section,.library-section,.certificates-section,.referrals-section)>:is(header,.section-heading){margin-block-end:var(--space-6)}.application-shell{background:var(--color-canvas)}.application-sidebar{border-inline-end-color:var(--color-border);box-shadow:none}.application-topbar{background:color-mix(in srgb,var(--color-surface) 96%,transparent);border-block-end:1px solid var(--color-border);box-shadow:none;-webkit-backdrop-filter:saturate(115%) blur(8px);backdrop-filter:saturate(115%) blur(8px)}.application-navigation button,.application-icon-button,.application-profile-button{transition:color var(--duration-fast) var(--ease-standard),background var(--duration-fast) var(--ease-standard),border-color var(--duration-fast) var(--ease-standard),transform var(--duration-fast) var(--ease-standard)}.application-navigation button:hover,.application-icon-button:hover,.application-profile-button:hover{transform:none}.application-navigation button.is-active{color:var(--color-accent);background:var(--color-accent-soft)}.application-popover{border:1px solid var(--color-border);box-shadow:var(--shadow-md);transform-origin:top right}.home-main{gap:0}.home-section{margin-block-end:clamp(var(--space-12),6vw,var(--space-20))}.home-section{scroll-margin-top:calc(var(--layout-topbar-height) + var(--space-6))}.home-section-heading{margin-block-end:var(--space-6)}.continue-learning-card,.home-course-card,.home-recent-card,.learning-stat-card{border-color:var(--color-border);box-shadow:none}.home-course-card:hover,.home-recent-card:hover{border-color:var(--color-border-strong);box-shadow:var(--shadow-sm);transform:translateY(-1px)}.home-course-card:focus-within{border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-focus)}.course-filter-chip{min-height:var(--control-height-md)}.browse-search-input{height:3rem}.home-course-pagination{margin-block-start:var(--space-8);justify-content:center}.course-overview-main{background:var(--color-canvas)}.overview-stat-card,.overview-module,.overview-development{border-color:var(--color-border);box-shadow:none}.overview-stat-card{background:var(--color-surface)}.workspace{background:var(--color-canvas)}.course-sidebar{box-shadow:none}.sidebar-header,.sidebar-summary,.sidebar-footer{background:var(--color-surface)}.module-trigger,.course-section-trigger{letter-spacing:-.012em}.lesson-link{min-height:2.5rem;border-radius:var(--radius-sm);transition:color var(--duration-fast) var(--ease-standard),background var(--duration-fast) var(--ease-standard),box-shadow var(--duration-fast) var(--ease-standard)}.lesson-link:hover{transform:none}.lesson-document{width:min(100%,49rem)}.lesson-document .lesson-header h1{font-size:clamp(2.2rem,4.4vw,3.7rem);line-height:1.04}.lesson-body{font-size:var(--font-size-body)}.reading-copy{max-width:68ch;line-height:var(--line-height-body)}.lesson-divider{border-color:var(--color-border)}.note-card,.callout-card,.exercise-card,.interactive-card,.ai-card,.lesson-image,.visual-placeholder{box-shadow:none}.quiz-option{min-height:2.75rem;transition:border-color var(--duration-fast) var(--ease-standard),background var(--duration-fast) var(--ease-standard),box-shadow var(--duration-fast) var(--ease-standard)}.quiz-option:focus-within{border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-focus)}.activity-feedback.is-success{color:var(--color-success);background:var(--color-success-soft)}.lesson-completion-footer{border-color:var(--color-border);box-shadow:0 -8px 20px #2023210a}.code-card,.compiler-ide,.ide-results{border-color:var(--color-code-border);box-shadow:none}.code-card,.compiler-ide{background:var(--color-code-surface);color:var(--color-code-text)}.compiler-dock{border-inline-start-color:var(--color-border);box-shadow:none}.ide-header,.ide-result-tabs,.ide-result-footer{background:var(--color-code-surface-raised)}.compiler-run-button:active:not(:disabled),.compiler-reset-button:active:not(:disabled){transform:scale(.96)}:is(.practice-question-card,.challenge-summary-card,.saved-item-card,.certificate-card,.referral-card,.settings-content,.settings-navigation,.project-card,.practice-stat-card,.challenge-stat-card,.library-stat-card,.certificate-stat-card){border-color:var(--color-border);box-shadow:none}:is(.practice-question-card,.challenge-summary-card,.saved-item-card,.certificate-card,.project-card):hover{border-color:var(--color-border-strong);box-shadow:var(--shadow-sm);transform:translateY(-1px)}.empty-state{max-width:34rem;margin-inline:auto;text-align:center}.form-error,[role=alert]{line-height:1.5}.skeleton-line,.skeleton-card{background:linear-gradient(100deg,var(--color-surface-subtle) 20%,var(--color-surface) 45%,var(--color-surface-subtle) 70%);background-size:220% 100%}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.application-shell[data-reduced-motion=true] *,.application-shell[data-reduced-motion=true] *:before,.application-shell[data-reduced-motion=true] *:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}.application-shell[data-reduced-transparency=true] :is(.application-topbar,.application-popover){background:var(--color-surface);-webkit-backdrop-filter:none;backdrop-filter:none}.application-shell[data-contrast=more]{--color-border: var(--color-border-strong);--color-text-muted: color-mix(in srgb, var(--color-text) 74%, var(--color-canvas))}@media(pointer:coarse){:where(button,[role=button],.application-navigation button,.lesson-link){min-height:2.75rem}}@media(max-width:64rem){:is(.home-main,.practice-page,.practice-detail,.challenges-page,.library-page,.settings-page,.certificates-page,.referrals-page,.projects-page,.placeholder-page){width:min(calc(100% - 2.5rem),86rem)}.home-main{gap:var(--space-12)}}@media(max-width:45rem){:is(.home-main,.practice-page,.practice-detail,.challenges-page,.library-page,.settings-page,.certificates-page,.referrals-page,.projects-page,.placeholder-page){width:min(calc(100% - 2rem),86rem)}.home-main{gap:var(--space-10)}.lesson-document .lesson-header h1{font-size:clamp(2rem,10vw,2.75rem)}.lesson-completion-footer{box-shadow:0 -5px 14px #2023210a}.application-topbar{-webkit-backdrop-filter:none;backdrop-filter:none}}@media(max-width:25rem){:is(.home-main,.practice-page,.practice-detail,.challenges-page,.library-page,.settings-page,.certificates-page,.referrals-page,.projects-page,.placeholder-page){width:min(calc(100% - 1.5rem),86rem)}}