:root{color-scheme:light;--brand: #6C5CE7;--brand-strong: #5A4BD1;--brand-dark: #4538B8;--brand-soft: #EDE9FF;--brand-softer: #F5F3FF;--brand-cyan: #22C5D9;--brand-cyan-soft: #EAFBFF;--brand-purple: #8B2CF5;--brand-purple-soft: #F4ECFF;--brand-grad: linear-gradient(135deg, #22C5D9 0%, #6C5CE7 55%, #8B2CF5 100%);--green: #22C55E;--green-dark: #16A34A;--green-soft: #DCFCE7;--blue: #7DD3FC;--blue-dark: #0EA5E9;--blue-soft: #E0F2FE;--yellow: #FACC15;--yellow-soft: #FEF9C3;--coral: #FF6B6B;--coral-soft: #FFE9E9;--bg: #F6F7FF;--surface: #FFFFFF;--surface-muted: #FBFBFE;--chip-bg: #F1F2FA;--border: #E6E8F5;--border-strong: #D8DBF0;--ink: #1F2937;--ink-soft: #4B5563;--muted: #6B7280;--placeholder: #9CA3AF;--code-bg: #1F2937;--code-ink: #D9DEEA;--topbar-bg: rgb(255 255 255 / .82);--glass-bg: rgb(255 255 255 / .85);--meter-bg: rgb(255 255 255 / .8);--yellow-ink: #A16207;--coral-ink: #B91C1C;--gumroad-ink: #E11D48;--gumroad-border: #FF5B7E;--gumroad-bg: #FFFFFF;--gumroad-hover-bg: #FFF0F3;--shadow-sm: 0 2px 10px rgba(80, 70, 150, .05);--shadow: 0 4px 20px rgba(80, 70, 150, .06);--shadow-lg: 0 16px 44px rgba(80, 70, 150, .12);--body-bg-image: radial-gradient(1100px 520px at 12% -8%, rgba(237, 233, 254, .9) 0%, transparent 60%), radial-gradient(900px 460px at 108% -4%, rgba(224, 242, 254, .85) 0%, transparent 55%);--hero-grad: linear-gradient(175deg, #F6F7FF 0%, #EDE9FE 55%, #E0F2FE 130%);--section-soft-grad: linear-gradient(180deg, #F6F7FF, #EDE9FE 130%);--demo-grad: linear-gradient(180deg, #F6F7FF 0%, #E0F2FE 140%);--auth-grad: linear-gradient(175deg, #F6F7FF 0%, #EDE9FE 60%, #E0F2FE 140%);--sp-hero-grad: linear-gradient(160deg, #F5F3FF 0%, #EDE9FE 55%, #E0F2FE 130%);--glow-brand: rgba(108, 92, 231, .18);--glow-blue: rgba(34, 197, 217, .18);--radius-xs: 8px;--radius-sm: 10px;--radius: 14px;--radius-lg: 18px;--radius-xl: 22px;--pill: 999px;--font: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;--font-display: "Plus Jakarta Sans", "Inter", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;--code: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, Menlo, monospace;--t-fast: .15s ease;--t: .25s cubic-bezier(.2, .6, .25, 1)}:root[data-theme=dark]{color-scheme:dark;--brand: #6C5CE7;--brand-strong: #8B7CFF;--brand-dark: #DCD3FF;--brand-soft: #2A2447;--brand-softer: #1D1B35;--brand-cyan: #22C5D9;--brand-cyan-soft: #12333F;--brand-purple: #8B2CF5;--brand-purple-soft: #2B1C3B;--brand-grad: linear-gradient(135deg, #22C5D9 0%, #6C5CE7 55%, #8B2CF5 100%);--green-dark: #16A34A;--green-soft: #0F2018;--blue-dark: #7DD3FC;--blue-soft: #0E1F30;--yellow-soft: #2C250F;--coral-soft: #331B22;--yellow-ink: #FACC15;--coral-ink: #FF8A8A;--gumroad-ink: #FF7A99;--gumroad-border: #FF6B93;--gumroad-bg: #231822;--gumroad-hover-bg: #2E1B27;--bg: #10111C;--surface: #1A1B28;--surface-muted: #212333;--chip-bg: #262839;--border: #2A2C3E;--border-strong: #3A3D55;--ink: #E6E9F2;--ink-soft: #B3BACB;--muted: #8D94A8;--placeholder: #6F7590;--code-bg: #0B0C14;--code-ink: #D9DEEA;--topbar-bg: rgb(16 17 28 / .82);--glass-bg: rgb(28 29 44 / .85);--meter-bg: rgb(255 255 255 / .14);--shadow-sm: 0 2px 10px rgb(0 0 0 / .3);--shadow: 0 4px 20px rgb(0 0 0 / .36);--shadow-lg: 0 16px 44px rgb(0 0 0 / .45);--body-bg-image: radial-gradient(1100px 520px at 12% -8%, rgba(108, 92, 231, .16) 0%, transparent 60%), radial-gradient(900px 460px at 108% -4%, rgba(14, 165, 233, .13) 0%, transparent 55%);--hero-grad: linear-gradient(175deg, #131321 0%, #1B1830 55%, #0F1F2B 130%);--section-soft-grad: linear-gradient(180deg, #131322, #1A1830 130%);--demo-grad: linear-gradient(180deg, #131322 0%, #0F202C 140%);--auth-grad: linear-gradient(175deg, #141524 0%, #1A1830 60%, #0F202C 140%);--sp-hero-grad: linear-gradient(160deg, #1B1A2E 0%, #211E3C 55%, #10212E 130%);--glow-brand: rgba(108, 92, 231, .35);--glow-blue: rgba(34, 197, 217, .22)}:root[data-theme=dark] select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9' viewBox='0 0 14 9'%3E%3Cpath d='M1 1l6 6 6-6' stroke='%238D94A8' stroke-width='2' fill='none' stroke-linecap='round' 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28px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.brand{display:inline-flex;align-items:center;gap:15px}.brand-mark{width:46px;height:46px;border-radius:11px;background:var(--brand-grad);display:grid;place-items:center;color:#fff;font-size:16px;font-weight:800;font-family:var(--font-display);box-shadow:0 4px 12px #6c5ce74d}.brand-mark img{filter:brightness(0) invert(1)}.brand-mark.lg{width:62px;height:62px;border-radius:18px;font-size:26px;margin:0 auto 18px;box-shadow:0 10px 26px #6c5ce747}.brand-name{font-family:var(--font-display);font-size:17px;font-weight:800;color:var(--ink);letter-spacing:-.01em}.topbar-nav{display:flex;align-items:center;gap:4px}.nav-link{display:inline-flex;align-items:center;font-size:14.5px;font-weight:600;color:var(--muted);padding:8px 14px;border-radius:var(--pill);transition:background var(--t-fast),color 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.icon-sun{display:none}:root[data-theme=dark] .theme-toggle .icon-moon{display:block}.user-chip{display:inline-flex;align-items:center;gap:10px}.avatar{width:34px;height:34px;border-radius:50%;background:var(--brand-grad);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:800;font-family:var(--font-display)}.user-name{color:var(--ink-soft);font-size:14px;font-weight:600}.topbar-signout,.link-btn{background:none;border:none;cursor:pointer;font:inherit;font-size:13.5px;font-weight:600;color:var(--muted);padding:6px 12px;border-radius:var(--pill);transition:color var(--t-fast),background var(--t-fast)}.topbar-signout:hover,.link-btn:hover{color:var(--brand);background:var(--brand-soft)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:inherit;font-family:var(--font-display);font-size:15.5px;font-weight:700;color:#fff;text-align:center;cursor:pointer;background:var(--brand);border:1.5px solid transparent;border-radius:12px;padding:12px 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