@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";@import"https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap";:root{--color-primary: #1e40af;--color-primary-hover: #1d3a9f;--color-primary-light: #dbeafe;--color-secondary: #0ea5e9;--color-secondary-hover:#0284c7;--color-accent: #f97316;--color-accent-hover: #ea6c0a;--color-accent-alt: #eab308;--color-bg: #ffffff;--color-bg-secondary: #f8fafc;--color-bg-tertiary: #f1f5f9;--color-surface: #ffffff;--color-text: #0f172a;--color-text-secondary: #334155;--color-text-muted: #64748b;--color-border: #e2e8f0;--color-border-subtle: #f1f5f9;--color-success: #16a34a;--color-success-text: #22c55e;--color-warning: #f97316;--color-star: #eab308;--color-error: #dc2626;--font-sans: "Inter", system-ui, -apple-system, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--text-5xl: 3rem;--font-normal: 400;--font-medium: 500;--font-semibold:600;--font-bold: 700;--leading-tight: 1.25;--leading-normal: 1.5;--leading-relaxed:1.75;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem;--space-24: 6rem;--container-max: 1280px;--container-pad: var(--space-6);--mobile-breakpoint: 768px;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .07), 0 2px 4px -2px rgb(0 0 0 / .05);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .08), 0 4px 6px -4px rgb(0 0 0 / .05);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .08), 0 8px 10px -6px rgb(0 0 0 / .04);--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease;--header-height: 3.25rem;--header-blur: blur(12px);--sidebar-width: 16rem;--lesson-topbar-height: 2.75rem;--color-primary-bg: rgba(59,130,246,.12);--color-success-bg: rgba(22,163,74,.12);--color-accent-bg: rgba(249,115,22,.12);--color-step-text: #60a5fa;--color-step-video: #a78bfa;--color-step-quiz: #34d399;--color-step-code: #fb923c;--color-code-bg: rgba(99, 102, 241, .08);--color-code-text: #4f46e5;--color-code-block-bg: #f8f8fc}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}img,svg,video{display:block;max-width:100%}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;border:none;background:none}a{color:inherit;text-decoration:none}ul,ol{list-style:none}h1,h2,h3,h4,h5,h6{font-weight:var(--font-bold);line-height:var(--leading-tight)}[data-theme=dark]{--color-bg: #0f172a;--color-bg-secondary: #1e293b;--color-bg-tertiary: #243249;--color-surface: #1e293b;--color-text: #f1f5f9;--color-text-secondary: #cbd5e1;--color-text-muted: #94a3b8;--color-border: #334155;--color-border-subtle: #1e293b;--color-primary-light: #1e3a6e;--color-primary: #60a5fa;--color-primary-hover: #93c5fd;--color-code-bg: rgba(139, 92, 246, .15);--color-code-text: #a78bfa;--color-code-block-bg: #1a1a2e}.container{width:100%;max-width:var(--container-max);margin-inline:auto;padding-inline:var(--container-pad)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);border-radius:var(--radius-lg);font-size:var(--text-sm);font-weight:var(--font-semibold);transition:background-color var(--transition-base),color var(--transition-base),border-color var(--transition-base),box-shadow var(--transition-base);cursor:pointer;border:2px solid transparent;white-space:nowrap}.btn-primary{background-color:var(--color-primary);color:#fff}.btn-primary:hover{background-color:var(--color-primary-hover);box-shadow:var(--shadow-md)}.btn-secondary{background-color:transparent;color:var(--color-primary);border-color:var(--color-primary)}.btn-secondary:hover{background-color:var(--color-primary-light)}.btn-accent{background-color:var(--color-accent);color:#fff}.btn-accent:hover{background-color:var(--color-accent-hover);box-shadow:var(--shadow-md)}.btn-ghost{background-color:transparent;color:var(--color-text);border-color:var(--color-border)}.btn-ghost:hover{background-color:var(--color-bg-secondary)}.btn-lg{padding:var(--space-4) var(--space-8);font-size:var(--text-base)}.badge{display:inline-flex;align-items:center;padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);font-size:var(--text-xs);font-weight:var(--font-semibold);letter-spacing:.05em;text-transform:uppercase}.badge-primary{background-color:var(--color-primary-light);color:var(--color-primary)}.badge-accent{background-color:#fff3e0;color:var(--color-accent)}[data-theme=dark] .badge-accent{background-color:#3d2308;color:#fb923c}.section-title{font-size:var(--text-3xl);font-weight:var(--font-bold);color:var(--color-text);line-height:var(--leading-tight)}@media(min-width:768px){.section-title{font-size:var(--text-4xl)}}.section-subtitle{font-size:var(--text-lg);color:var(--color-text-muted);line-height:var(--leading-relaxed);max-width:40rem}*::-webkit-scrollbar{width:6px;height:6px}*::-webkit-scrollbar-track{background:transparent}*::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:3px}*::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}*{scrollbar-width:thin;scrollbar-color:var(--color-border) transparent}.sidebar::-webkit-scrollbar{width:4px}.sidebar::-webkit-scrollbar-track{background:transparent}.sidebar::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:2px}.sidebar::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}.sidebar{scrollbar-width:thin;scrollbar-color:var(--color-border) transparent}.notif-stack[data-v-33190020]{position:fixed;top:20px;right:20px;z-index:9999;display:flex;flex-direction:column;gap:8px;max-width:380px;width:calc(100vw - 40px);pointer-events:none}.notification[data-v-33190020]{display:flex;align-items:flex-start;gap:12px;padding:12px 14px;border-radius:10px;border:1px solid transparent;background:var(--color-bg-secondary);box-shadow:0 4px 24px #00000026;pointer-events:all;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.notification--success[data-v-33190020]{border-color:#22c55e4d;background:#22c55e14}.notification--error[data-v-33190020]{border-color:#ef44444d;background:#ef444414}.notification--warning[data-v-33190020]{border-color:#f59e0b4d;background:#f59e0b14}.notification--info[data-v-33190020]{border-color:#3b82f64d;background:#3b82f614}.notification__icon[data-v-33190020]{flex-shrink:0;width:20px;height:20px;margin-top:1px}.notification__icon svg[data-v-33190020]{width:20px;height:20px;display:block}.notification--success .notification__icon[data-v-33190020]{color:#22c55e}.notification--error .notification__icon[data-v-33190020]{color:#ef4444}.notification--warning .notification__icon[data-v-33190020]{color:#f59e0b}.notification--info .notification__icon[data-v-33190020]{color:#3b82f6}.notification__body[data-v-33190020]{flex:1;min-width:0}.notification__title[data-v-33190020]{font-size:.875rem;font-weight:600;color:var(--color-text);margin:0;line-height:1.4}.notification__message[data-v-33190020]{font-size:.8rem;color:var(--color-text-muted);margin:2px 0 0;line-height:1.4;word-wrap:break-word}.notification__close[data-v-33190020]{flex-shrink:0;background:none;border:none;cursor:pointer;color:var(--color-text-muted);padding:0;display:inline-flex;align-items:center;justify-content:center;transition:color .15s}.notification__close[data-v-33190020]:hover{color:var(--color-text)}.confirm-overlay[data-v-33190020]{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:10000;display:flex;align-items:center;justify-content:center;padding:16px;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.confirm-dialog[data-v-33190020]{background:var(--color-bg);border:1px solid var(--color-border);border-radius:12px;padding:24px;max-width:400px;width:100%;box-shadow:0 20px 60px #0000004d}.confirm-dialog__title[data-v-33190020]{font-size:1rem;font-weight:600;color:var(--color-text);margin:0 0 8px}.confirm-dialog__message[data-v-33190020]{font-size:.875rem;color:var(--color-text-muted);margin:0 0 20px;line-height:1.5;word-wrap:break-word}.confirm-dialog__actions[data-v-33190020]{display:flex;gap:8px;justify-content:flex-end}.confirm-dialog__btn[data-v-33190020]{padding:8px 20px;border-radius:6px;font-size:.875rem;font-weight:500;cursor:pointer;border:1px solid transparent;transition:opacity .15s,transform .1s,color .15s,border-color .15s,background .15s;font-family:inherit}.confirm-dialog__btn[data-v-33190020]:active{transform:scale(.98)}.confirm-dialog__btn--cancel[data-v-33190020]{background:transparent;border-color:var(--color-border);color:var(--color-text-muted)}.confirm-dialog__btn--cancel[data-v-33190020]:hover{color:var(--color-text);border-color:var(--color-text-muted)}.confirm-dialog__btn--confirm[data-v-33190020]{background:var(--color-primary);color:#fff}.confirm-dialog__btn--confirm[data-v-33190020]:hover{opacity:.9}.confirm-dialog__btn--danger[data-v-33190020]{background:var(--color-error);color:#fff}.confirm-dialog__btn--danger[data-v-33190020]:hover{opacity:.9}.notification-enter-active[data-v-33190020]{transition:all .3s cubic-bezier(.34,1.56,.64,1)}.notification-leave-active[data-v-33190020]{transition:all .2s ease;position:absolute;right:0;width:100%}.notification-enter-from[data-v-33190020],.notification-leave-to[data-v-33190020]{opacity:0;transform:translate(100%)}.notification-move[data-v-33190020]{transition:transform .3s ease}.confirm-enter-active[data-v-33190020],.confirm-leave-active[data-v-33190020]{transition:opacity .2s ease}.confirm-enter-from[data-v-33190020],.confirm-leave-to[data-v-33190020]{opacity:0}.confirm-enter-active .confirm-dialog[data-v-33190020],.confirm-leave-active .confirm-dialog[data-v-33190020]{transition:transform .2s ease}.confirm-enter-from .confirm-dialog[data-v-33190020],.confirm-leave-to .confirm-dialog[data-v-33190020]{transform:scale(.96) translateY(-8px)}.email-banner[data-v-67460de8]{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:12px;padding:10px 16px;background:linear-gradient(90deg,#f59e0b,#ef4444);color:#fff;box-shadow:0 2px 8px #0000001f;font-size:.9rem}.email-banner__icon[data-v-67460de8]{font-size:1.1rem;line-height:1}.email-banner__text[data-v-67460de8]{margin:0;flex:1;line-height:1.45}.email-banner__cta[data-v-67460de8]{flex-shrink:0;background:#ffffff2e;color:#fff;padding:6px 14px;border-radius:6px;font-weight:600;text-decoration:none;transition:background var(--transition-base)}.email-banner__cta[data-v-67460de8]:hover{background:#ffffff4d;text-decoration:none}.email-banner__close[data-v-67460de8]{flex-shrink:0;background:none;border:none;color:#ffffffd9;font-size:1.1rem;line-height:1;cursor:pointer;width:28px;height:28px;border-radius:4px;transition:background var(--transition-base)}.email-banner__close[data-v-67460de8]:hover{background:#ffffff2e;color:#fff}@media(max-width:640px){.email-banner[data-v-67460de8]{flex-wrap:wrap;padding:10px 12px}.email-banner__text[data-v-67460de8]{font-size:.85rem}.email-banner__cta[data-v-67460de8]{font-size:.85rem;padding:5px 10px}}.banner-enter-active[data-v-67460de8],.banner-leave-active[data-v-67460de8]{transition:transform var(--transition-base),opacity var(--transition-base)}.banner-enter-from[data-v-67460de8],.banner-leave-to[data-v-67460de8]{transform:translateY(-100%);opacity:0}.user-dropdown[data-v-64525b07]{position:relative}.user-dropdown__trigger[data-v-64525b07]{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-1) var(--space-2) var(--space-1) var(--space-1);border-radius:var(--radius-md);background:none;border:none;cursor:pointer;color:var(--color-text);transition:background-color var(--transition-fast)}.user-dropdown__trigger[data-v-64525b07]:hover{background-color:var(--color-bg-tertiary)}.user-dropdown__trigger--compact[data-v-64525b07]{padding:0;gap:0}.user-dropdown__trigger--compact[data-v-64525b07]:hover{background:none}.user-dropdown__trigger--compact:hover .user-dropdown__avatar[data-v-64525b07]{opacity:.85}.user-dropdown__avatar[data-v-64525b07]{width:1.875rem;height:1.875rem;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-secondary) 100%);display:flex;align-items:center;justify-content:center;font-size:.65rem;font-weight:var(--font-bold);color:#fff;flex-shrink:0;overflow:hidden;transition:opacity var(--transition-fast)}.user-dropdown--compact .user-dropdown__avatar[data-v-64525b07]{width:32px;height:32px}.user-dropdown__avatar-img[data-v-64525b07]{width:100%;height:100%;object-fit:cover;border-radius:50%}.user-dropdown__avatar-initials[data-v-64525b07]{font-size:.65rem;font-weight:var(--font-bold);color:#fff}.user-dropdown--compact .user-dropdown__avatar-initials[data-v-64525b07]{font-size:12px;font-weight:var(--font-semibold)}.user-dropdown__name[data-v-64525b07]{font-size:var(--text-sm);font-weight:var(--font-medium)}@media(max-width:639px){.user-dropdown__name[data-v-64525b07]{display:none}}.user-dropdown__chevron[data-v-64525b07]{color:var(--color-text-muted);transition:transform var(--transition-fast)}.user-dropdown__chevron--open[data-v-64525b07]{transform:rotate(180deg)}.user-dropdown__menu[data-v-64525b07]{position:absolute;top:calc(100% + 6px);right:0;min-width:12rem;background-color:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);padding:var(--space-1);z-index:1000;overflow:hidden}.user-dropdown__header[data-v-64525b07]{padding:var(--space-2) var(--space-3) var(--space-1);display:flex;flex-direction:column;gap:2px}.user-dropdown__header-name[data-v-64525b07]{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text)}.user-dropdown__header-username[data-v-64525b07]{font-size:var(--text-xs);color:var(--color-text-muted);word-break:break-all}.user-dropdown__header-title[data-v-64525b07]{display:inline-block;margin-top:2px;padding:.05rem .5rem;font-size:var(--text-xs);font-weight:var(--font-semibold);color:#fff;background:linear-gradient(90deg,#6366f1,#a855f7);border-radius:999px}.user-dropdown__sep[data-v-64525b07]{height:1px;background-color:var(--color-border);margin:var(--space-1) 0}.user-dropdown__item[data-v-64525b07]{display:flex;align-items:center;gap:var(--space-2);width:100%;padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);font-size:var(--text-sm);color:var(--color-text);text-decoration:none;background:none;border:none;cursor:pointer;text-align:left;transition:background-color var(--transition-fast),color var(--transition-fast)}.user-dropdown__item[data-v-64525b07]:hover{background-color:var(--color-bg-tertiary)}.user-dropdown__item svg[data-v-64525b07]{color:var(--color-text-muted);flex-shrink:0}.user-dropdown__item--danger[data-v-64525b07]{color:var(--color-error)}.user-dropdown__item--danger[data-v-64525b07]:hover{background-color:#dc262614}.user-dropdown__item--danger svg[data-v-64525b07]{color:var(--color-error)}.user-dropdown-enter-active[data-v-64525b07],.user-dropdown-leave-active[data-v-64525b07]{transition:opacity var(--transition-fast),transform var(--transition-fast);transform-origin:top right}.user-dropdown-enter-from[data-v-64525b07],.user-dropdown-leave-to[data-v-64525b07]{opacity:0;transform:scale(.96) translateY(-4px)}.level-chip[data-v-4fbf3cc8]{display:inline-flex;align-items:center;gap:.25rem;padding:.25rem .625rem;background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff;border:none;border-radius:999px;font-size:.8125rem;font-weight:700;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease}.level-chip[data-v-4fbf3cc8]:hover{transform:translateY(-1px);box-shadow:0 4px 12px -4px #3b82f680}.level-chip__star[data-v-4fbf3cc8]{font-size:.875rem;color:#fde047;text-shadow:0 0 4px rgba(253,224,71,.6)}.notif[data-v-77ef65b4]{position:relative;display:inline-flex}.notif__trigger[data-v-77ef65b4]{width:32px;height:32px;border:none;border-radius:var(--radius-md);background:transparent;color:var(--color-text-muted);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;position:relative}.notif__trigger[data-v-77ef65b4]:hover{background:var(--color-bg-tertiary);color:var(--color-text)}.notif__badge[data-v-77ef65b4]{position:absolute;top:0;right:0;background:#ef4444;color:#fff;font-size:.6rem;font-weight:700;border-radius:10px;padding:1px 4px;min-width:14px;text-align:center;line-height:1.4;pointer-events:none}.gsearch[data-v-5b47f608]{position:relative;display:inline-flex}.gsearch__trigger[data-v-5b47f608]{width:32px;height:32px;border:none;border-radius:var(--radius-md);background:transparent;color:var(--color-text-muted);display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.gsearch__trigger[data-v-5b47f608]:hover,.gsearch__trigger--active[data-v-5b47f608]{background:var(--color-bg-tertiary);color:var(--color-text)}.gsearch__panel[data-v-5b47f608]{position:absolute;top:calc(100% + 8px);right:0;width:360px;max-width:calc(100vw - 24px);background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:var(--space-2);z-index:200}@media(max-width:480px){.gsearch__panel[data-v-5b47f608]{position:fixed;top:3.5rem;left:12px;right:12px;width:auto;max-width:none}}.gsearch__field[data-v-5b47f608]{position:relative;margin-bottom:var(--space-2)}.gsearch__field-icon[data-v-5b47f608]{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--color-text-muted);pointer-events:none;display:inline-flex}.gsearch__input[data-v-5b47f608]{width:100%;padding:9px 10px 9px 34px;font-size:var(--text-sm);color:var(--color-text);background:var(--color-bg-secondary);border:1px solid 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4px;font-size:var(--text-xs);font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-muted)}.gsearch__item[data-v-5b47f608]{width:100%;display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2);border:none;border-radius:var(--radius-md);background:transparent;cursor:pointer;text-align:left}.gsearch__item[data-v-5b47f608]:hover{background:var(--color-bg-tertiary)}.gsearch__thumb[data-v-5b47f608]{flex-shrink:0;width:40px;height:28px;border-radius:var(--radius-sm);overflow:hidden;background:var(--color-bg-tertiary);display:inline-flex;align-items:center;justify-content:center}.gsearch__thumb 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