@import"https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700;800;900&family=Inter:wght@300;400;500;600;700;800;900&display=swap";:root{--color-primary: #1677ff;--color-primary-hover: #4096ff;--color-primary-active: #0958d9;--color-primary-bg: #e6f4ff;--color-primary-bg-hover: #bae0ff;--color-primary-border: #91caff;--color-primary-border-hover: #69b1ff;--color-primary-text: #1677ff;--color-primary-text-hover: #4096ff;--color-primary-text-active: #0958d9;--color-success: #52c41a;--color-success-bg: #f6ffed;--color-success-border: #b7eb8f;--color-success-hover: #73d13d;--color-success-active: #389e0d;--color-warning: #faad14;--color-warning-bg: #fffbe6;--color-warning-border: #ffe58f;--color-warning-hover: #ffc53d;--color-error: #ff4d4f;--color-error-bg: #fff2f0;--color-error-border: #ffccc7;--color-error-hover: #ff7875;--color-error-active: #d9363e;--color-info: #1677ff;--color-info-bg: #e6f4ff;--color-info-border: #91caff;--color-text: rgba(0, 0, 0, .88);--color-text-secondary: rgba(0, 0, 0, .75);--color-text-tertiary: rgba(0, 0, 0, .6);--color-text-quaternary: rgba(0, 0, 0, .4);--color-text-placeholder: rgba(0, 0, 0, .4);--color-bg-container: #ffffff;--color-bg-elevated: #ffffff;--color-bg-layout: #f5f5f5;--color-bg-spotlight: rgba(0, 0, 0, .85);--color-bg-mask: rgba(0, 0, 0, .45);--color-fill: rgba(0, 0, 0, .15);--color-fill-secondary: rgba(0, 0, 0, .06);--color-fill-tertiary: rgba(0, 0, 0, .04);--color-fill-quaternary: rgba(0, 0, 0, .02);--color-border: #d9d9d9;--color-border-secondary: #f0f0f0;--color-split: rgba(5, 5, 5, .06);--font-sans: "Noto Sans KR", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "Fira Code", "SF Mono", "Consolas", monospace;--font-size-sm: 12px;--font-size-base: 14px;--font-size-lg: 16px;--font-size-xl: 20px;--font-size-2xl: 24px;--font-size-3xl: 30px;--font-size-heading-1: 38px;--font-size-heading-2: 30px;--font-size-heading-3: 24px;--font-size-heading-4: 20px;--font-size-heading-5: 16px;--line-height-base: 1.5714;--line-height-lg: 1.5;--line-height-sm: 1.6667;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--spacing-xxs: 4px;--spacing-xs: 8px;--spacing-sm: 12px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-xxl: 48px;--radius-xs: 2px;--radius-sm: 4px;--radius-md: 6px;--radius-lg: 8px;--radius-xl: 12px;--radius-round: 999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .03), 0 1px 6px -1px rgba(0, 0, 0, .02), 0 2px 4px 0 rgba(0, 0, 0, .02);--shadow-md: 0 6px 16px 0 rgba(0, 0, 0, .08), 0 3px 6px -4px rgba(0, 0, 0, .12), 0 9px 28px 8px rgba(0, 0, 0, .05);--shadow-lg: 0 6px 16px 0 rgba(0, 0, 0, .08), 0 3px 6px -4px rgba(0, 0, 0, .12), 0 9px 28px 8px rgba(0, 0, 0, .05);--shadow-glow: 0 0 0 2px rgba(22, 119, 255, .06);--transition-fast: .1s cubic-bezier(.645, .045, .355, 1);--transition-normal: .2s cubic-bezier(.645, .045, .355, 1);--transition-slow: .3s cubic-bezier(.645, .045, .355, 1);--motion-ease-out: cubic-bezier(.215, .61, .355, 1);--motion-ease-in-out: cubic-bezier(.645, .045, .355, 1);--anim-entrance: .4s cubic-bezier(.08, .82, .17, 1);--sidebar-width: 256px;--topbar-height: 48px;--content-max-width: 720px;--bg-primary: var(--color-bg-container);--bg-secondary: var(--color-bg-layout);--bg-tertiary: var(--color-fill-tertiary);--bg-card: var(--color-bg-container);--bg-code: var(--color-fill-quaternary);--bg-hover: var(--color-fill-secondary);--accent-primary: var(--color-primary);--accent-primary-light: var(--color-primary-hover);--accent-primary-glow: var(--shadow-glow);--accent-secondary: #e84393;--accent-secondary-light: #fd79a8;--accent-firebase: var(--color-warning);--accent-stitch: var(--color-primary);--accent-success: var(--color-success);--accent-success-glow: rgba(82, 196, 26, .1);--accent-danger: var(--color-error);--accent-info: var(--color-info);--text-primary: var(--color-text);--text-secondary: var(--color-text-secondary);--text-muted: var(--color-text-tertiary);--text-code: var(--color-text);--border-subtle: var(--color-split);--border-medium: var(--color-border-secondary);--border-primary: var(--color-border);--border-accent: var(--color-primary-border);--surface-secondary: var(--color-fill-quaternary);--report-navy: #1e40af;--report-navy-bg: rgba(30, 64, 175, .06);--report-navy-border: rgba(30, 64, 175, .15);--report-green-bg: rgba(82, 196, 26, .06);--report-amber-bg: rgba(250, 173, 20, .06);--report-red-bg: rgba(255, 77, 79, .06);--report-blue-bg: rgba(22, 119, 255, .06);--report-purple-bg: rgba(114, 46, 209, .05);--exercise-correct-bg: var(--color-success-bg);--exercise-correct-border: var(--color-success-border);--exercise-correct-text: var(--color-success-active);--exercise-wrong-bg: var(--color-error-bg);--exercise-wrong-border: var(--color-error-border);--exercise-wrong-text: var(--color-error-active);--exercise-neutral-bg: var(--color-warning-bg);--exercise-neutral-border: var(--color-warning-border);--exercise-neutral-text: #d48806;--exercise-interactive-bg: var(--color-fill-quaternary);--exercise-interactive-border: var(--color-split);--exercise-accent: var(--color-primary)}[data-theme=dark]{--color-primary: #1668dc;--color-primary-hover: #3c89e8;--color-primary-active: #1554ad;--color-primary-bg: rgba(22, 104, 220, .15);--color-primary-bg-hover: rgba(22, 104, 220, .25);--color-primary-border: #15417e;--color-primary-border-hover: #15417e;--color-success: #49aa19;--color-success-bg: rgba(73, 170, 25, .15);--color-success-border: #274916;--color-success-active: #6abe39;--color-warning: #d89614;--color-warning-bg: rgba(216, 150, 20, .15);--color-warning-border: #594214;--color-error: #dc4446;--color-error-bg: rgba(220, 68, 70, .15);--color-error-border: #58181c;--color-error-active: #e86e6b;--color-info: #1668dc;--color-info-bg: rgba(22, 104, 220, .15);--color-info-border: #15417e;--color-text: rgba(255, 255, 255, .9);--color-text-secondary: rgba(255, 255, 255, .75);--color-text-tertiary: rgba(255, 255, 255, .65);--color-text-quaternary: rgba(255, 255, 255, .5);--color-text-placeholder: rgba(255, 255, 255, .5);--color-bg-container: #141414;--color-bg-elevated: #1f1f1f;--color-bg-layout: #000000;--color-bg-spotlight: rgba(255, 255, 255, .85);--color-bg-mask: rgba(0, 0, 0, .45);--color-fill: rgba(255, 255, 255, .18);--color-fill-secondary: rgba(255, 255, 255, .12);--color-fill-tertiary: rgba(255, 255, 255, .08);--color-fill-quaternary: rgba(255, 255, 255, .04);--color-border: #424242;--color-border-secondary: #303030;--color-split: rgba(253, 253, 253, .12);--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .15), 0 1px 6px -1px rgba(0, 0, 0, .12);--shadow-md: 0 6px 16px 0 rgba(0, 0, 0, .32), 0 3px 6px -4px rgba(0, 0, 0, .48), 0 9px 28px 8px rgba(0, 0, 0, .2);--shadow-lg: 0 6px 16px 0 rgba(0, 0, 0, .32), 0 3px 6px -4px rgba(0, 0, 0, .48), 0 9px 28px 8px rgba(0, 0, 0, .2);--shadow-glow: 0 0 0 2px rgba(22, 104, 220, .1);--bg-primary: var(--color-bg-container);--bg-secondary: var(--color-bg-elevated);--bg-tertiary: var(--color-fill-tertiary);--bg-card: var(--color-bg-elevated);--bg-code: var(--color-bg-elevated);--bg-hover: var(--color-fill-secondary);--text-primary: var(--color-text);--text-secondary: var(--color-text-secondary);--text-muted: var(--color-text-tertiary);--text-code: var(--color-text);--border-subtle: var(--color-split);--border-medium: var(--color-border-secondary);--border-primary: var(--color-border);--surface-secondary: var(--color-fill-quaternary);--report-navy: #93c5fd;--report-navy-bg: rgba(147, 197, 253, .08);--report-navy-border: rgba(147, 197, 253, .2);--report-green-bg: rgba(73, 170, 25, .08);--report-amber-bg: rgba(216, 150, 20, .08);--report-red-bg: rgba(220, 68, 70, .08);--report-blue-bg: rgba(22, 104, 220, .08);--report-purple-bg: rgba(146, 84, 222, .08)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}@media(hover:none)and (pointer:coarse){button:active,a:active,[role=button]:active,.sidebar__chapter:active,.welcome__tool:active,.welcome__part-card:active,.step-nav__button:active{transform:scale(.97);transition:transform .1s ease}}html{font-size:14px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background:var(--color-bg-layout);color:var(--color-text);font-size:var(--font-size-base);line-height:var(--line-height-base);min-height:100vh;overflow-x:hidden;word-break:keep-all;letter-spacing:-.01em}#root{min-height:100vh}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-hover)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-fill);border-radius:var(--radius-round);transition:background var(--transition-fast)}::-webkit-scrollbar-thumb:hover{background:var(--color-fill-secondary)}*{scrollbar-width:thin;scrollbar-color:var(--color-fill) transparent}[data-theme=dark] ::-webkit-scrollbar-thumb{background:#fff3}[data-theme=dark] ::-webkit-scrollbar-thumb:hover{background:#ffffff59}:focus-visible{outline:2px solid var(--color-primary);outline-offset:1px;border-radius:var(--radius-sm)}::selection{background:var(--color-primary-bg);color:var(--color-primary-active)}.app-layout{display:flex;min-height:100vh}.app-main{flex:1;margin-left:var(--sidebar-width);min-height:100vh;display:flex;flex-direction:column;transition:margin-left var(--transition-slow);background:var(--color-bg-layout);padding-left:env(safe-area-inset-left,0px);padding-right:env(safe-area-inset-right,0px)}.app-main.sidebar-collapsed{margin-left:0}.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;background:var(--color-bg-container);border-right:1px solid var(--color-border-secondary);display:flex;flex-direction:column;z-index:100;transition:transform var(--transition-slow);overflow:hidden;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}[data-theme=dark] .sidebar{background:var(--color-bg-elevated);border-right-color:var(--color-border-secondary)}.sidebar.collapsed{transform:translate(-100%)}.sidebar-overlay{position:fixed;inset:0;background:var(--color-bg-mask);z-index:99;opacity:0;pointer-events:none;transition:opacity var(--transition-normal)}.sidebar-overlay.visible{opacity:1;pointer-events:auto}.sidebar__header{padding:var(--spacing-lg) var(--spacing-md) var(--spacing-md);border-bottom:1px solid var(--color-border-secondary)}.sidebar__logo{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xs) var(--spacing-xxs);margin-bottom:var(--spacing-xxs);text-decoration:none;color:inherit;border-radius:var(--radius-md);transition:background var(--transition-fast)}.sidebar__logo:hover{background:var(--color-fill-secondary);text-decoration:none;color:inherit}.sidebar__logo-icon{width:32px;height:32px;background:var(--color-primary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}.sidebar__logo-icon--report{background:linear-gradient(135deg,#1e40af,#3b82f6)}.sidebar__logo-icon--webplan{background:linear-gradient(135deg,#3b82f6,#6366f1)}.sidebar__logo-text{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);letter-spacing:-.01em;color:var(--color-text)}.sidebar__subtitle{font-size:var(--font-size-sm);color:var(--color-text-tertiary);letter-spacing:.05em;text-transform:uppercase;padding-left:44px}.sidebar__back-link{display:flex;align-items:center;gap:var(--spacing-xxs);margin-top:var(--spacing-xs);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-text-tertiary);text-decoration:none;padding:var(--spacing-xxs) 0;transition:color var(--transition-fast)}.sidebar__back-link:hover{color:var(--color-primary);text-decoration:none}.sidebar__nav{flex:1;overflow-y:auto;padding:var(--spacing-xs) 0}.sidebar__part{margin-bottom:2px}.sidebar__part-title{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-xs) var(--spacing-md) var(--spacing-xxs);font-size:11px;font-weight:var(--font-weight-bold);text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-tertiary)}.sidebar__part-title--clickable{cursor:pointer;background:none;border:none;width:100%;text-align:left;border-radius:var(--radius-sm);transition:color var(--transition-fast),background var(--transition-fast)}.sidebar__part-title--clickable:hover{background:var(--color-fill-secondary);color:var(--color-text-secondary)}.sidebar__part-count{font-size:10px;font-family:var(--font-mono);color:var(--color-text-quaternary)}.sidebar__part-count--done{color:var(--color-success)}.sidebar__section-group{margin-bottom:var(--spacing-xxs)}.sidebar__section-label{padding:var(--spacing-xs) var(--spacing-md) 2px 20px;font-size:11px;font-weight:var(--font-weight-semibold);color:var(--color-text-quaternary);letter-spacing:.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar__chapter{display:flex;align-items:center;gap:var(--spacing-xs);padding:8px var(--spacing-md) 8px 20px;font-size:var(--font-size-base);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);border-right:3px solid transparent;text-decoration:none;margin:1px 0}.sidebar__chapter:hover{background:var(--color-fill-secondary);color:var(--color-text);text-decoration:none}.sidebar__chapter.active{background:var(--color-primary-bg);color:var(--color-primary);border-right-color:var(--color-primary);font-weight:var(--font-weight-medium)}.sidebar__chapter.completed{color:var(--color-success)}.sidebar__chapter-icon{min-width:26px;height:22px;padding:0 var(--spacing-xxs);border-radius:var(--radius-round);border:1.5px solid var(--color-border);display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:var(--font-weight-semibold);flex-shrink:0;overflow:hidden;transition:all var(--transition-fast);line-height:1;white-space:nowrap;color:var(--color-text-tertiary)}.sidebar__chapter.active .sidebar__chapter-icon{border-color:var(--color-primary);background:var(--color-primary-bg);color:var(--color-primary)}.sidebar__chapter.completed .sidebar__chapter-icon{border-color:var(--color-success);background:var(--color-success-bg);color:var(--color-success)}.sidebar__chapter-text{display:flex;align-items:center;gap:var(--spacing-xxs);flex:1;min-width:0}.sidebar__chapter-text>span:first-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sidebar__chapter-time{font-size:10px;font-weight:var(--font-weight-medium);color:var(--color-text-quaternary);background:var(--color-fill-quaternary);padding:1px 6px;border-radius:var(--radius-round);flex-shrink:0;white-space:nowrap}.sidebar__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;border-top:1px solid var(--color-border-secondary);background:var(--color-border-secondary);flex-shrink:0}.sidebar__grid-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:var(--spacing-sm) var(--spacing-xs);background:var(--color-bg-container);color:var(--color-text-tertiary);text-decoration:none;border:none;cursor:pointer;font-size:11px;font-weight:var(--font-weight-medium);transition:all var(--transition-fast)}[data-theme=dark] .sidebar__grid-btn{background:var(--color-bg-elevated)}.sidebar__grid-btn:hover{background:var(--color-fill-secondary);color:var(--color-primary)}.sidebar__grid-btn.active{color:var(--color-primary)}.sidebar__grid-icon{font-size:18px;line-height:1}.sidebar__grid-label{font-size:11px;letter-spacing:.01em}.sidebar__hub-courses{display:flex;flex-direction:column;gap:var(--spacing-xs);padding:0 var(--spacing-xs)}.sidebar__hub-course-card{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-lg);background:var(--color-fill-quaternary);border:1px solid var(--color-border-secondary);text-decoration:none;color:inherit;transition:all var(--transition-fast)}.sidebar__hub-course-card:hover{background:var(--color-primary-bg);border-color:var(--color-primary-border);text-decoration:none;color:inherit}.sidebar__hub-course-icon{font-size:24px;flex-shrink:0}.sidebar__hub-course-info{display:flex;flex-direction:column;gap:2px;min-width:0}.sidebar__hub-course-title{font-weight:var(--font-weight-semibold);font-size:var(--font-size-base);color:var(--color-text)}.sidebar__hub-course-desc{font-size:var(--font-size-sm);color:var(--color-text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar{position:sticky;top:0;z-index:90;height:calc(var(--topbar-height) + env(safe-area-inset-top,0px));padding-top:env(safe-area-inset-top,0px);background:var(--color-bg-container);border-bottom:1px solid var(--color-border-secondary);box-shadow:var(--shadow-sm);display:flex;align-items:center;padding-left:max(var(--spacing-lg),env(safe-area-inset-left,0px));padding-right:max(var(--spacing-lg),env(safe-area-inset-right,0px));gap:var(--spacing-sm);transition:transform .3s ease}[data-theme=dark] .topbar{background:#0f172ad9;backdrop-filter:blur(16px) saturate(180%);-webkit-backdrop-filter:blur(16px) saturate(180%);border-bottom-color:#ffffff0f}.topbar--hidden{transform:translateY(-100%)}.topbar__toggle{background:none;border:none;color:var(--color-text-secondary);font-size:18px;cursor:pointer;padding:var(--spacing-xxs);border-radius:var(--radius-sm);transition:color var(--transition-fast),background var(--transition-fast);width:32px;height:32px;display:none;align-items:center;justify-content:center}.topbar__toggle:hover{color:var(--color-text);background:var(--color-fill-secondary)}.topbar__progress-container{flex:1;display:flex;align-items:center;gap:var(--spacing-sm)}.topbar__progress-bar{flex:1;height:4px;background:#ffffff0f;border-radius:var(--radius-round);overflow:hidden}[data-theme=light] .topbar__progress-bar{background:var(--color-fill-secondary)}.topbar__progress-fill{height:100%;background:linear-gradient(90deg,#6366f1,#818cf8,#60a5fa);border-radius:var(--radius-round);transition:width .6s cubic-bezier(.22,1,.36,1);box-shadow:0 0 8px #6366f14d}.topbar__progress-text{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--color-text-secondary);white-space:nowrap;min-width:36px;font-variant-numeric:tabular-nums}.topbar__theme-toggle{background:none;border:1px solid var(--color-border);color:var(--color-text);border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:14px;transition:all var(--transition-fast);flex-shrink:0}.topbar__theme-toggle:hover{background:var(--color-fill-secondary);border-color:var(--color-primary);color:var(--color-primary)}.topbar__breadcrumb{display:flex;align-items:center;gap:var(--spacing-xs);flex:1;min-width:0;padding:0 var(--spacing-xxs)}.topbar__breadcrumb-id{font-size:11px;font-weight:var(--font-weight-bold);padding:2px 8px;background:var(--color-primary);color:#fff;border-radius:var(--radius-sm);flex-shrink:0;font-family:var(--font-mono)}.topbar__breadcrumb-id--report{background:linear-gradient(135deg,#1e40af,#3b82f6)}.topbar__breadcrumb-title{font-size:var(--font-size-base);font-weight:var(--font-weight-medium);color:var(--color-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar__search-trigger{background:none;border:1px solid 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